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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2020

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number 000-24939

EAST WEST BANCORP, INC.

(Exact name of registrant as specified in its charter)

Delaware

(State or other jurisdiction of incorporation or organization)

95-4703316

(I.R.S. Employer Identification No.)

135 North Los Robles Ave., 7th Floor, Pasadena, California 91101

(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code:

(626) 768-6000

Securities registered pursuant to Section 12(b) of the Act: 

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock, $0.001 Par Value

EWBC

The Nasdaq Global Select Market

        Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes ☒ No ☐

        Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

Yes ☒ No ☐

        Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer

☒

Accelerated filer

☐

Non-accelerated filer

☐

Smaller reporting company

☐

Emerging growth company

☐

        If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

        Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes ☐ No ☒

        Number of shares outstanding of the issuer’s common stock on the latest practicable date: 141,486,780 shares as of July 31, 2020.

---

TABLE OF CONTENTS

									Page
PART I — FINANCIAL INFORMATION															3
			Item 1.			Consolidated Financial Statements			3
						Consolidated Balance Sheet (Unaudited)			3
						Consolidated Statement of Income (Unaudited)			4
						Consolidated Statement of Comprehensive Income (Unaudited)			5
						Consolidated Statement of Changes in Stockholders’ Equity (Unaudited)			6
						Consolidated Statement of Cash Flows (Unaudited)			7
						Notes to Consolidated Financial Statements (Unaudited)			9
						1 — Basis of Presentation			9
						2 — Current Accounting Developments and Summary of Significant Accounting Policies			10
						3 — Fair Value Measurement and Fair Value of Financial Instruments			14
						4 — Securities Purchased under Resale Agreements and Sold under Repurchase Agreements			24
						5 — Securities			25
						6 — Derivatives			29
						7 — Loans Receivable and Allowance for Credit Losses			35
						8 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities			50
						9 — Goodwill and Other Intangible Assets			52
						10 — Commitments and Contingencies			53
						11 — Revenue from Contracts with Customers			54
						12 — Stock Compensation Plans			57
						13 — Stockholders’ Equity and Earnings Per Share			58
						14 — Accumulated Other Comprehensive Income (Loss)			59
						15 — Business Segments			60
						16 — Subsequent Events			62
			Item 2.			Management’s Discussion and Analysis of Financial Condition and Results of Operations			63
			Item 3.			Quantitative and Qualitative Disclosures About Market Risk			119
			Item 4.			Controls and Procedures			119
PART II — OTHER INFORMATION															120
			Item 1.			Legal Proceedings			120
			Item 1A.			Risk Factors			120
			Item 2.			Unregistered Sales of Equity Securities and Use of Proceeds			121
			Item 6.			Exhibits			122
GLOSSARY OF ACRONYMS															123
SIGNATURE															124

2

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PART I — FINANCIAL INFORMATION

ITEM 1. CONSOLIDATED FINANCIAL STATEMENTS

EAST WEST BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEET

($ in thousands, except shares)

(Unaudited)

						June 30, 2020						December 31, 2019
						(Unaudited)
ASSETS
Cash and due from banks						$	602,974					$	536,221
Interest-bearing cash with banks						3,930,528						2,724,928
Cash and cash equivalents						4,533,502						3,261,149
Interest-bearing deposits with banks						531,591						196,161
Securities purchased under resale agreements (“resale agreements”)						1,260,000						860,000
Securities:
Available-for-sale (''AFS'') debt securities, at fair value (amortized cost of $3,823,714 in 2020; includes assets pledged as collateral of $745,163 in 2020 and $479,432 in 2019)						3,884,574						3,317,214
Restricted equity securities, at cost						78,963						78,580
Loans held-for-sale						3,875						434
Loans held-for-investment (net of allowance for loan losses of $632,071 in 2020 and $358,287 in 2019; includes assets pledged as collateral of $27,408,027 in 2020 and $22,431,092 in 2019)						36,597,341						34,420,252
Investments in qualified affordable housing partnerships, net						201,888						207,037
Investments in tax credit and other investments, net						251,318						254,140
Premises and equipment (net of accumulated depreciation of $122,372 in 2020 and $116,790 in 2019)						110,709						118,364
Goodwill						465,697						465,697
Operating lease right-of-use assets						94,898						99,973
Other assets						1,393,237						917,095
TOTAL						$	49,407,593					$	44,196,096
LIABILITIES
Deposits:
Noninterest-bearing						$	13,940,420					$	11,080,036
Interest-bearing						26,732,258						26,244,223
Total deposits						40,672,678						37,324,259
Short-term borrowings						252,851						28,669
Federal Home Loan Bank (“FHLB”) advances						656,759						745,915
Securities sold under repurchase agreements (“repurchase agreements”)						300,000						200,000
Long-term debt and finance lease liabilities						1,580,442						152,270
Operating lease liabilities						102,708						108,083
Accrued expenses and other liabilities						854,912						619,283
Total liabilities						44,420,350						39,178,479
COMMITMENTS AND CONTINGENCIES (Note 10)
STOCKHOLDERS’ EQUITY
Common stock, $0.001 par value, 200,000,000 shares authorized; 167,143,278 and 166,621,959 shares issued in 2020 and 2019, respectively						167						167
Additional paid-in capital						1,841,748						1,826,345
Retained earnings						3,755,649						3,689,377
Treasury stock, at cost — 25,656,881 shares in 2020 and 20,996,574 shares in 2019						(633,455)						(479,864)
Accumulated other comprehensive income (loss) (“AOCI”), net of tax						23,134						(18,408)
Total stockholders’ equity						4,987,243						5,017,617
TOTAL						$	49,407,593					$	44,196,096

See accompanying Notes to Consolidated Financial Statements.

3

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EAST WEST BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF INCOME

($ and shares in thousands, except per share data)

(Unaudited)

						Three Months Ended June 30,																		Six Months Ended June 30,
						2020						2019						2020						2019
INTEREST AND DIVIDEND INCOME
Loans receivable, including fees						$	367,393					$	434,450					$	779,262					$	857,984
AFS debt securities						21,004						15,685						41,146						31,433
Resale agreements						5,514						7,404						11,139						15,310
Restricted equity securities						301						505						747						1,218
Interest-bearing cash and deposits with banks						4,564						16,800						15,672						32,210
Total interest and dividend income						398,776						474,844						847,966						938,155
INTEREST EXPENSE
Deposits						46,399						97,964						122,802						189,969
Short-term borrowings						265						361						821						977
FHLB advances						3,343						4,011						7,509						6,990
Repurchase agreements						3,540						3,469						7,531						6,961
Long-term debt and finance lease liabilities						1,454						1,713						2,821						3,471
Total interest expense						55,001						107,518						141,484						208,368
Net interest income before provision for credit losses						343,775						367,326						706,482						729,787
Provision for credit losses						102,443						19,245						176,313						41,824
Net interest income after provision for credit losses						241,332						348,081						530,169						687,963
NONINTEREST INCOME
Lending fees						21,946						16,423						37,719						31,392
Deposit account fees						10,872						9,607						21,319						19,075
Foreign exchange income						4,562						7,286						12,381						12,301
Wealth management fees						3,091						3,800						8,444						7,574
Interest rate contracts and other derivative income						6,107						10,398						13,180						13,614
Net gains on sales of loans						132						15						1,082						930
Gains on sales of AFS debt securities						9,640						1,447						11,169						3,008
Other investment income						966						706						2,887						1,908
Other income						1,321						3,077						4,505						5,088
Total noninterest income						58,637						52,759						112,686						94,890
NONINTEREST EXPENSE
Compensation and employee benefits						96,955						100,531						198,915						202,830
Occupancy and equipment expense						16,217						17,362						33,293						34,680
Deposit insurance premiums and regulatory assessments						3,700						2,919						7,127						6,007
Legal expense						1,530						2,355						4,727						4,580
Data processing						4,480						3,460						8,306						6,617
Consulting expense						1,413						2,069						2,630						4,128
Deposit related expense						3,353						3,338						6,916						6,842
Computer software expense						7,301						6,211						13,467						12,289
Other operating expense						19,248						22,679						40,367						44,968
Amortization of tax credit and other investments						24,759						16,739						42,084						41,644
Repurchase agreements’ extinguishment cost						8,740						—						8,740						—
Total noninterest expense						187,696						177,663						366,572						364,585
INCOME BEFORE INCOME TAXES						112,273						223,177						276,283						418,268
INCOME TAX EXPENSE						12,921						72,797						32,107						103,864
NET INCOME						$	99,352					$	150,380					$	244,176					$	314,404
EARNINGS PER SHARE (“EPS”)
BASIC						$	0.70					$	1.03					$	1.71					$	2.16
DILUTED						$	0.70					$	1.03					$	1.70					$	2.15
WEIGHTED-AVERAGE NUMBER OF SHARES OUTSTANDING
BASIC						141,486						145,546						143,150						145,402
DILUTED						141,827						146,052						143,560						146,016

See accompanying Notes to Consolidated Financial Statements.

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EAST WEST BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME

($ in thousands)

(Unaudited)

						Three Months Ended June 30,																		Six Months Ended June 30,
						2020						2019						2020						2019
Net income						$	99,352					$	150,380					$	244,176					$	314,404
Other comprehensive income (loss), net of tax:
Net changes in unrealized gains on AFS debt securities						17,816						29,027						45,269						51,038
Net changes in unrealized losses on cash flow hedges						(1,333)						—						(1,333)						—
Foreign currency translation adjustments						(230)						(6,016)						(2,394)						(2,836)
Other comprehensive income						16,253						23,011						41,542						48,202
COMPREHENSIVE INCOME						$	115,605					$	173,391					$	285,718					$	362,606

See accompanying Notes to Consolidated Financial Statements.

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EAST WEST BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY

($ in thousands, except shares)

(Unaudited)

																								Common Stock and Additional Paid-in Capital																		Retained Earnings						Treasury Stock						AOCI, Net of Tax						Total Stockholders’ Equity
																								Shares						Amount
BALANCE, APRIL 1, 2019																								145,501,301						$	1,799,124					$	3,305,054					$	(479,265)					$	(32,983)					$	4,591,930
Net income																								—						—						150,380						—						—						150,380
Other comprehensive income																								—						—						—						—						23,011						23,011
Net activity of common stock pursuant to various stock compensation plans and agreements																								45,268						9,938						—						(133)						—						9,805
Cash dividends on common stock ($0.275 per share)																								—						—						(40,533)						—						—						(40,533)
BALANCE, JUNE 30, 2019																								145,546,569						$	1,809,062					$	3,414,901					$	(479,398)					$	(9,972)					$	4,734,593
BALANCE, APRIL 1, 2020																								141,435,099						$	1,833,784					$	3,695,759					$	(633,439)					$	6,881					$	4,902,985
Net income																								—						—						99,352						—						—						99,352
Other comprehensive income																								—						—						—						—						16,253						16,253
Net activity of common stock pursuant to various stock compensation plans and agreements																								51,298						8,131						—						(16)						—						8,115
Cash dividends on common stock ($0.275 per share)																								—						—						(39,462)						—						—						(39,462)
BALANCE, JUNE 30, 2020																								141,486,397						$	1,841,915					$	3,755,649					$	(633,455)					$	23,134					$	4,987,243

																								Common Stock and Additional Paid-in Capital																		Retained Earnings						Treasury Stock						AOCI, Net of Tax						Total Stockholders’ Equity
																								Shares						Amount
BALANCE, JANUARY 1, 2019																								144,961,363						$	1,789,977					$	3,160,132					$	(467,961)					$	(58,174)					$	4,423,974
Cumulative-effect of change in accounting principle related to leases (1)																								—						—						14,668						—						—						14,668
Net income																								—						—						314,404						—						—						314,404
Other comprehensive income																								—						—						—						—						48,202						48,202
Warrants exercised																								180,226						1,711						—						2,732						—						4,443
Net activity of common stock pursuant to various stock compensation plans and agreements																								404,980						17,374						—						(14,169)						—						3,205
Cash dividends on common stock ($0.505 per share)																								—						—						(74,303)						—						—						(74,303)
BALANCE, JUNE 30, 2019																								145,546,569						$	1,809,062					$	3,414,901					$	(479,398)					$	(9,972)					$	4,734,593
BALANCE, JANUARY 1, 2020																								145,625,385						$	1,826,512					$	3,689,377					$	(479,864)					$	(18,408)					$	5,017,617
Cumulative-effect of change in accounting principle related to credit losses (2)																								—						—						(97,967)						—						—						(97,967)
Net income																								—						—						244,176						—						—						244,176
Other comprehensive income																								—						—						—						—						41,542						41,542
Net activity of common stock pursuant to various stock compensation plans and agreements																								332,694						15,403						—						(7,625)						—						7,778
Repurchase of common stock pursuant to the Stock Repurchase Program																								(4,471,682)						—						—						(145,966)						—						(145,966)
Cash dividends on common stock ($0.550 per share)																								—						—						(79,937)						—						—						(79,937)
BALANCE, JUNE 30, 2020																								141,486,397						$	1,841,915					$	3,755,649					$	(633,455)					$	23,134					$	4,987,243

(1) Represents the impact of the adoption of Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842) and subsequent related ASUs in the first quarter of 2019.

(2) Represents the impact of the adoption of ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) in the first quarter of 2020. Refer to Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Quarterly Report on Form 10-Q (“this Form 10-Q”) for additional information.

See accompanying Notes to Consolidated Financial Statements.

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EAST WEST BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF CASH FLOWS

($ in thousands)

(Unaudited)

						Six Months Ended June 30,
						2020						2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income						$	244,176					$	314,404
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization						68,926						72,113
Accretion of discount and amortization of premiums, net						(18,901)						(9,817)
Stock compensation costs						14,280						15,525
Deferred income tax benefit						(111)						(2,110)
Provision for credit losses						176,313						41,824
Net gains on sales of loans						(1,082)						(930)
Gains on sales of AFS debt securities						(11,169)						(3,008)
Loans held-for-sale:
Originations and purchases						(21,791)						(3,339)
Proceeds from sales and paydowns/payoffs of loans originally classified as held-for-sale						18,386						3,632
Proceeds from distributions received from equity method investees						1,107						1,538
Net change in accrued interest receivable and other assets						(456,374)						(150,154)
Net change in accrued expenses and other liabilities						257,397						10,320
Other net operating activities						(241)						3
Total adjustments						26,740						(24,403)
Net cash provided by operating activities						270,916						290,001
CASH FLOWS FROM INVESTING ACTIVITIES
Net (increase) decrease in:
Investments in qualified affordable housing partnerships, tax credit and other investments						(68,884)						(61,555)
Interest-bearing deposits with banks						(315,497)						222,387
Resale agreements:
Proceeds from paydowns and maturities						350,000						50,000
Purchases						(500,000)						(25,000)
AFS debt securities:
Proceeds from sales						484,380						375,102
Proceeds from repayments, maturities and redemptions						848,633						117,325
Purchases						(1,834,087)						(316,740)
Loans held-for-investment:
Proceeds from sales of loans originally classified as held-for-investment						144,015						170,174
Purchases						(145,695)						(326,456)
Other changes in loans held-for-investment, net						(2,475,089)						(1,196,094)
Premises and equipment:
Proceeds from sales						1,883						—
Purchases						(1,846)						(4,414)
Proceeds from distributions received from equity method investees						1,948						3,636
Other net investing activities						(374)						(5,516)
Net cash used in investing activities						(3,510,613)						(997,151)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits						3,355,168						1,035,650
Net increase (decrease) in short-term borrowings						225,834						(38,107)
FHLB advances:
Proceeds						10,100						1,500,000
Repayment						(100,099)						(1,082,000)
Repayment of repurchase agreements						(150,000)						—
Repurchase agreements’ extinguishment cost						(8,740)						—
Long-term debt and lease liabilities:
Proceeds from long-term debt						1,437,269						—
Repayment of long-term debt and lease liabilities						(9,320)						(435)
Common stock:
Repurchase of common stocks pursuant to the Stock Repurchase Program						(145,965)						—
Proceeds from issuance pursuant to various stock compensation plans and agreements						1,170						1,894
Stocks tendered for payment of withholding taxes						(7,626)						(14,169)
Cash dividends paid						(80,271)						(74,949)
Net cash provided by financing activities						4,527,520						1,327,884
Effect of exchange rate changes on cash and cash equivalents						(15,470)						(497)
NET INCREASE IN CASH AND CASH EQUIVALENTS						1,272,353						620,237
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD						3,261,149						3,001,377
CASH AND CASH EQUIVALENTS, END OF PERIOD						$	4,533,502					$	3,621,614

See accompanying Notes to Consolidated Financial Statements.

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EAST WEST BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF CASH FLOWS

($ in thousands)

(Unaudited)

(Continued)

						Six Months Ended June 30,
						2020						2019
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid during the period for:
Interest						$	145,723					$	203,577
Income taxes, net						$	5,609					$	76,153
Noncash investing and financing activities:
Loans transferred from held-for-investment to held-for-sale						$	143,283					$	173,394
Loans transferred to OREO						$	19,504					$	—

See accompanying Notes to Consolidated Financial Statements.

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EAST WEST BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Note 1 — Basis of Presentation

East West Bancorp, Inc. (referred to herein on an unconsolidated basis as “East West” and on a consolidated basis as the “Company”) is a registered bank holding company that offers a full range of banking services to individuals and businesses through its subsidiary bank, East West Bank and its subsidiaries (“East West Bank” or the “Bank”). The unaudited interim Consolidated Financial Statements in this Form 10-Q include the accounts of East West, East West Bank and East West’s subsidiaries. Intercompany transactions and accounts have been eliminated in consolidation. As of June 30, 2020, East West also has six wholly-owned subsidiaries that are statutory business trusts (the “Trusts”). In accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 810, Consolidation, the Trusts are not included on the Consolidated Financial Statements. East West also owns East West Insurance Services, Inc. In 2019, the Company acquired East West Markets, LLC, a private broker dealer and also established East West Investment Management LLC, a registered investment adviser. Both East West Markets, LLC and East West Investment Management LLC are wholly-owned subsidiaries of East West.

The unaudited interim Consolidated Financial Statements are presented in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”), applicable guidelines prescribed by regulatory authorities, and general practices in the banking industry. They reflect all adjustments that, in the opinion of management, are necessary for fair statement of the interim Consolidated Financial Statements. Certain items on the Consolidated Financial Statements and notes for the prior periods have been reclassified to conform to the current period presentation.

The current period’s results of operations are not necessarily indicative of results that may be expected for any other interim period or for the year as a whole. Events subsequent to the Consolidated Balance Sheet date have been evaluated through the date the Consolidated Financial Statements are issued for inclusion in the accompanying Consolidated Financial Statements. The unaudited interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and notes thereto, included in the Company’s annual report on Form 10-K for the year ended December 31, 2019, filed with the U.S. Securities and Exchange Commission on February 27, 2020 (the “Company’s 2019 Form 10-K”).

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Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies

New Accounting Pronouncements Adopted

Standard

Required Date of Adoption

Description

Effect on Financial Statements

Standards Adopted in 2020

ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments and subsequent related ASUs

January 1, 2020 Early adoption is permitted on January 1, 2019.

The ASU introduces a new current expected credit loss (“CECL”) model that applies to most financial assets measured at amortized cost and certain instruments, including trade and other receivables, loan receivables, AFS and held-to-maturity debt securities, net investments in leases and off-balance sheet credit exposures. The CECL model utilizes a lifetime “expected credit loss” measurement objective for the recognition of credit losses at the time the financial asset is originated or acquired. The expected credit losses are adjusted in each period for changes in expected lifetime credit losses. ASU 2016-13 also eliminates the guidance for purchased credit impaired (“PCI”) loans, but requires an allowance for loan losses for purchased financial assets with more than an insignificant deterioration of credit since origination. The ASU also modifies the other-than-temporary impairment (“OTTI”) model for AFS debt securities to require an allowance for credit losses instead of a direct write-down. A reversal of the allowance for credit losses is allowed in future periods based on improvements in credit performance expectations. This ASU expands the disclosure requirements regarding an entity’s assumptions, models and methods for estimating the allowance for loan and lease losses, and requires disclosure of the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination (i.e., by vintage year). The guidance should be applied using a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption. The new guidance also allows optional relief for certain instruments measured at amortized cost with an option to irrevocably elect the fair value option under ASC Topic 825, Financial Instruments.

The Company adopted ASU 2016-13 using a modified retrospective approach on January 1, 2020 without electing the fair value option on eligible financial instruments under ASU 2019-05. The adoption of this ASU increased the allowance for loan losses by $125.2 million, and allowance for unfunded credit commitments by $10.5 million and an after-tax decrease to opening retained earnings of $98.0 million on January 1, 2020. The increase to allowance for loan losses was primarily related to the commercial and industrial (“C&I”) and commercial real estate (“CRE”) loan portfolios. The Company did not record an allowance for credit losses related to the Company’s AFS debt securities as a result of this adoption. Disclosures for periods after January 1, 2020 are presented in accordance with ASC 326 while prior period amounts continue to be reported in accordance with previously applicable standards and the accounting policies described in the Company’s 2019 Form 10-K. The Company has elected the CECL phase-in option provided by regulatory capital rules, which delays the impact of CECL on regulatory capital for two years, followed by a three-year transition period.

ASU 2017-04, Intangibles — Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment

January 1, 2020 Early adoption is permitted for interim or annual goodwill impairment tests with measurement dates after January 1, 2017.

The ASU simplifies the accounting for goodwill impairment. Under this guidance, an entity will no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, an impairment loss will be recognized when the carrying amount of a reporting unit exceeds its fair value and the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The guidance also eliminates the requirement to perform a qualitative assessment for any reporting units with a zero or negative carrying amount. This guidance should be applied prospectively.

The Company adopted this guidance on January 1, 2020. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.

ASU 2018-15, Intangibles — Goodwill and Other — Internal-Use Software (Subtopic 350-40) Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract

January 1, 2020

The ASU amends ASC Topic 350-40 to align the accounting for costs incurred in a cloud computing arrangement with the guidance on developing internal use software. Specifically, if a cloud computing arrangement is deemed to be a service contract, certain implementation costs are eligible for capitalization. The new guidance prescribes the balance sheet and income statement presentation and cash flow classification for the capitalized costs and related amortization expense. The amendments in this ASU should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption.

The Company adopted this guidance on a prospective basis on January 1, 2020. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.

10

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Recent Accounting Pronouncement

Standard

Required Date of Adoption

Description

Effect on Financial Statements

Standard Not Yet Adopted

ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting

Effective for all entities as of March 12, 2020 through December 31, 2022.

In March 2020, the FASB issued a new accounting standard related to contracts or hedging relationships that reference London interbank offered rate or other reference rates that are expected to be discontinued due to reference rate reform. This ASU provides temporary optional expedients and exceptions regarding the accounting requirements related to the modification of certain contracts, hedging relationships and other transactions that are affected by the reference rate reform. The guidance permits the Company to make a one-time election to sell and/or transfer qualifying held-to-maturity securities, and not to apply modification accounting or remeasure lease payments in lease contracts if the changes to the contract are related to the discontinuation of the reference rate. If certain criteria are met, the amendments also allow exceptions to the de-designation criteria of the hedging relationship and the assessment of hedge effectiveness during the transition period. This one time election may be made at any time after March 12, 2020, but no later than December 31, 2022.

The Company has not yet made a determination on whether it will make this election and is currently tracking the exposure as of each reporting period and assessing the significance of impact towards implementing any necessary modification in consideration of the election of this amendment. The Company will continue to assess the impact as the reference rate transition occurs over the next two years.

Summary of Significant Accounting Policies

The Company has revised the following significant accounting policies.

Allowance for Loan Losses — The allowance for loan losses is established as management’s estimate of expected credit losses inherent in the Company’s lending activities and increased by the provision for credit losses and decreased by net charge-offs. Subsequent recoveries, if any, are credited to the allowance for loan losses. The allowance for loan losses is evaluated quarterly by management based on regular reviews of the collectability of the loans. The Company develops and documents the allowance for loan losses methodology at the portfolio segment level — the commercial loan portfolio is comprised of C&I, CRE, multifamily residential, and construction and land loans; and the consumer loan portfolio is comprised of single-family residential, home equity lines of credit (“HELOC”), and other consumer loans.

The allowance for loan losses represents the portion of the loan’s amortized cost basis that the Company does not expect to collect due to anticipated credit losses over the loan’s contractual life. The Company measures the expected loan losses on a collective pool basis when similar risk characteristics exist. Models consisting of quantitative and qualitative components are designed for each pool to develop the expected credit loss estimates. Reasonable and supportable forecast periods vary by loan portfolio. The collectively evaluated loans include non-classified and classified loans that have not been determined to be impaired. The Company has adopted lifetime loss rate models for the portfolios, which use historical loss rates and forecast economic variables to calculate the expected credit losses for each loan pool.

When impaired loans do not share similar risk characteristics, the Company evaluates the loan for expected credit losses on an individual basis. Impaired loans include nonaccrual and troubled debt restructuring (“TDR”) loans. The Company considers loans to be impaired if, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the original contractual terms of the loan agreement. For loans determined to be impaired, three different asset valuation measurement methods are available: (1) the present value of expected future cash flows, (2) the fair value of collateral less costs to sell, and (3) the loan's observable market price. The allowance for loan losses for collateral-dependent loans is determined based on the fair value of the collateral less costs to sell. For loans that are not collateral-dependent, the Company applies the present value of expected future cash flows valuation or the market value of the loan. When the loan is deemed uncollectible, the Company’s policy is to promptly charge off the estimated impaired amount.

The amortized cost of loans held-for-investment excludes accrued interest, which is included in Other assets on the Consolidated Balance Sheet. The Company has made an accounting policy election to not recognize an allowance for credit losses for accrued interest receivables as the Company reverses accrued interest if a loan is on nonaccrual status.

The allowance for loan losses is reported separately on the Consolidated Balance Sheet and the Provision for credit losses is reported on the Consolidated Statement of Income.

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Allowance for Unfunded Credit Commitments — The allowance for unfunded credit commitments includes reserves provided for unfunded loan commitments, letters of credit, standby letters of credit (“SBLCs”) and recourse obligations for loans sold. The Company estimates the allowance for unfunded credit commitments over the contractual period in which the entity is exposed to credit risk via a present contractual obligation to extend credit. Within the period of credit exposure, the estimate of credit losses will consider both the likelihood that funding will occur, and an estimate of the expected credit losses on the commitments that are expected to fund over their estimated lives.

The allowance for unfunded credit commitments is maintained at a level believed by management to be sufficient to absorb estimated expected credit losses related to unfunded credit facilities. The determination of the adequacy of the allowance is based on periodic evaluations of the unfunded credit facilities. For all off-balance sheet instruments and commitments, the unfunded credit exposure is calculated using utilization assumptions based on the Company's historical utilization experience in related portfolio segments. Loss rates are applied to the calculated exposure balances to estimate the allowance for unfunded credit commitments. Other elements such as credit risk factors for loans outstanding, terms and expiration dates of the unfunded credit facilities, and other pertinent information are considered to determine the adequacy of the allowance.

The allowance for unfunded credit commitments is included in Accrued expenses and other liabilities on the Consolidated Balance Sheet. Changes to the allowance for unfunded credit commitments are included in Provision for credit losses on the Consolidated Income Statements.

Allowance for Credit Losses on Available-for-Sale Debt Securities — ASU 2016-13 modifies the OTTI model for AFS debt securities to apply an allowance approach for credit impairment as opposed to permanently writing down the cost basis of the security. For each reporting period, AFS debt securities that are in an unrealized loss position are individually analyzed as part of the Company’s ongoing assessments to determine whether a fair value below the amortized cost basis has resulted from a credit loss or other factors. The initial indicator of impairment is a decline in fair value below the amortized cost, excluding accrued interest, of the AFS debt security. The Company first considers whether there is a plan to sell the AFS debt security or it is more-likely-than-not that it will be required to sell the debt security before recovery of the amortized cost. In determining whether an impairment is due to credit related factors, the Company considers the severity of the decline in fair value, nature of the security, the underlying collateral, the financial condition of the issuer, changes in the AFS debt securities’ ratings and other qualitative factors. For securities that are fully guaranteed by the U.S. government, or certain government enterprises, the Company believes that the credit loss exposure on these securities is remote and applies a zero credit loss assumption.

When the Company does not intend to sell the impaired AFS debt security and it is more-likely-than-not that the Company will not be required to sell the impaired debt security prior to recovery of its amortized cost basis, the credit component of the unrealized loss of the impaired AFS debt security is recognized as an allowance for credit losses, with a corresponding Provision for credit losses on the Consolidated Statement of Income and the non-credit component is recognized in Other comprehensive income (loss) on the Consolidated Statement of Comprehensive Income, net of applicable taxes. At each reporting period, the Company increases or decreases the allowance for credit losses as appropriate, while limiting reversals of the allowance for credit losses to the extent of the amounts previously recorded. If the Company intends to sell the impaired debt security or it is more-likely-than-not that the Company will be required to sell the impaired debt security prior to recovering its amortized cost basis, the entire impairment amount is recognized as an adjustment to the debt security’s amortized cost basis, with a corresponding Provision for credit losses on the Consolidated Statement of Income.

The amortized cost of the Company’s AFS debt securities excludes accrued interest, which is included in Other assets on the Consolidated Balance Sheet. The Company has made an accounting policy election to not recognize an allowance for credit losses for accrued interest receivables on AFS debt securities as the Company reverses any accrued interest if a debt security is impaired. As each AFS debt security has a unique security structure, where the accrual status is clearly determined when certain criteria listed in the terms are met, the Company assesses the default status of each security as defined by the debt security’s specific security structure.

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Allowance for Collateral-Dependent Financial Assets — A financial asset is considered collateral-dependent if repayment is expected to be provided substantially through the operation or sale of the collateral. The allowance for credit losses is measured on an individual basis for collateral-dependent financial assets and determined by comparing the fair value of the collateral, minus the cost to sell, to the amortized cost basis of the related financial asset at the reporting date. Other than impaired loans, collateral-dependent financial assets could also include resale agreements. In arrangements which the borrower must continually adjust the collateral securing the asset to reflect changes in the collateral’s fair value (e.g., resale agreements), the Company estimates the expected credit losses on the basis of the unsecured portion of the amortized cost as of the balance sheet date. If the fair value of the collateral is equal to or greater than the amortized cost of the resale agreement, the expected losses would be zero. If the fair value of the collateral is less than the amortized cost of the asset, the expected losses are limited to the difference between the fair value of the collateral and the amortized cost basis of the resale agreement.

Allowance for Purchased Credit Deteriorated Assets — ASU 2016-13 replaces the concept of PCI accounting under ASC 310-30 Receivables - Loans and Debt Securities Acquired with Deteriorated Credit Quality with the concept of purchased financial assets with credit deterioration. The Company adopted ASU 2016-13 using the prospective transition approach for Purchased credit deteriorated (“PCD”) assets that were previously classified as PCI assets. PCD financial assets are defined as acquired individual financial assets (or groups with similar risk characteristics) that as of the date of acquisition, have experienced a more-than-insignificant deterioration in credit quality since origination. For PCD debt securities and PCD loans, the company records the allowance for credit losses by grossing up the initial amortized cost, which includes the purchase price and the allowance for credit losses. The expected credit losses of PCD debt securities are measured at the individual security level. The expected credit losses for PCD loans are measured based on the loan’s unpaid principal balance. Beginning January 1, 2020, for any asset designated as a PCD asset at the time of acquisition, the Company estimates and records an allowance for credit losses, which is added to the purchase price to establish the initial amortized cost basis of the financial asset. Hence, there is no income statement impact from the acquisition. Subsequent changes in the allowance for credit losses on PCD assets will be recognized in Provision for credit losses on the Consolidated Statement of Income. The noncredit discount or premium will be accreted to interest income based on the effective interest rate on the PCD assets determined after the gross-up for the allowance for credit losses.

Troubled Debt Restructurings — The Company has implemented various loan modification programs to provide its borrowers relief from the economic impacts of the Coronavirus Disease 2019 (“COVID-19”). In accordance with the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”), the Company has elected to not apply TDR classification to any COVID-19 related loan modifications that were performed after March 1, 2020 to borrowers who were current as of December 31, 2019. For loans modified in response to the COVID-19 pandemic that do not meet the CARES Act criteria (e.g., current payment status at December 31, 2019), the Company has applied the guidance included in “Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customer Affected by the Coronavirus (Revised)” (the “Interagency Statement”) issued by the federal banking regulators on April 7, 2020. The Interagency Statement states that loan modifications performed in light of the COVID-19 pandemic, including loan payment deferrals that are up to six months in duration, that were granted to borrowers who were current as of the implementation date of a loan modification program or modifications granted under government mandated modification programs, are not TDRs. The delinquency of the loans modified under the CARES Act and Interagency Statement is frozen at the time of the modification, and interest income continues to be recognized over the contractual life of the loan. For more information on the Company's TDR accounting, see Note 1 — Summary of Significant Accounting Principles — Troubled Debt Restructurings to the Consolidated Financial Statements of the Company’s 2019 Annual Report on Form 10-K.

Paycheck Protection Program (“PPP”) — In April 2020, the Company started accepting PPP applications and began to originate loans to qualified small businesses under the PPP established by the CARES Act. These loans are included in the C&I portfolio, carry an interest rate of 1%, and are 100% guaranteed by the Small Business Administration (“SBA”). No allowance for loan losses were recorded for these loans as of June 30, 2020. As of June 30, 2020, the Company has funded over 7,200 PPP loans for customers with an outstanding loan balance totaling $1.75 billion. The majority of the Company’s PPP loans have a term of two years. The SBA pays the Company fees for processing PPP loans in the following amounts: (1) five percent for loans of not more than $350,000; (2) three percent for loans of more than $350,000 and less than $2,000,000; and (3) one percent for loans of at least $2,000,000. Loan processing fees paid to the Company by the SBA are accounted for as loan origination fees, where net deferred fees are recognized over the estimated life of the loan as a yield adjustment on the loans. Payments by borrowers on PPP loans begin ten months after the loan forgiveness covered period. Under the terms of the PPP, such loans are eligible to be forgiven if certain conditions are satisfied, in which case the SBA will make payments to the Company for the forgiven amounts. If a loan is paid off or forgiven by the SBA prior to its projected estimated life, the remaining unamortized deferred fees will be recognized as interest income in that period.

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Note 3 — Fair Value Measurement and Fair Value of Financial Instruments

Fair Value Determination

Fair value is defined as the price that would be received to sell an asset or the price that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. In determining the fair value of financial instruments, the Company uses various methods including market and income approaches. Based on these approaches, the Company utilizes certain assumptions that market participants would use in pricing an asset or a liability. These inputs can be readily observable, market corroborated or generally unobservable. The Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy noted below is based on the quality and reliability of the information used to determine fair value. The fair value hierarchy gives the highest priority to quoted prices available in active markets and the lowest priority to data lacking transparency. The fair value of the Company’s assets and liabilities is classified and disclosed in one of the following three categories:

•Level 1 — Valuation is based on quoted prices for identical instruments traded in active markets.

•Level 2 — Valuation is based on quoted prices for similar instruments traded in active markets; quoted prices for identical or similar instruments traded in markets that are not active; and model-derived valuations whose inputs are observable and can be corroborated by market data.

•Level 3 — Valuation is based on significant unobservable inputs for determining the fair value of assets or liabilities. These significant unobservable inputs reflect assumptions that market participants may use in pricing the assets or liabilities.

The classification of assets and liabilities within the hierarchy is based on whether inputs to the valuation methodology used are observable or unobservable, and the significance of those inputs in the fair value measurement. The Company’s assets and liabilities are classified in their entirety based on the lowest level of input that is significant to their fair value measurements.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following section describes the valuation methodologies used by the Company to measure financial assets and liabilities on a recurring basis, as well as the general classification of these instruments pursuant to the fair value hierarchy.

Available-for-Sale Debt Securities — When available, the Company uses quoted market prices to determine the fair value of AFS debt securities, which are classified as Level 1. Level 1 AFS debt securities are comprised of U.S. Treasury securities. The fair value of other AFS debt securities is generally determined by independent external pricing service providers who have experience in valuing these securities or by taking the average quoted market prices obtained from independent external brokers. The valuations provided by the third-party pricing service providers are based on observable market inputs, which include benchmark yields, reported trades, issuer spreads, benchmark securities, bids, offers, prepayment expectation and reference data obtained from market research publications. Inputs used by the third-party pricing service providers in valuing collateralized mortgage obligations and other securitization structures also include new issue data, monthly payment information, whole loan collateral performance, tranche evaluation and “To Be Announced” prices. In valuing securities issued by state and political subdivisions, inputs used by third-party pricing service providers also include material event notices.

On a monthly basis, the Company validates the valuations provided by third-party pricing service providers to ensure that the fair value determination is consistent with the applicable accounting guidance and the financial instruments are properly classified in the fair value hierarchy. To perform this validation, the Company evaluates the fair values of securities by comparing the fair values provided by the third-party pricing service providers to prices from other available independent sources for the same securities. When variances in prices are identified, the Company further compares inputs used by different sources to ascertain the reliability of these sources. On a quarterly basis, the Company reviews the documentation received from the third-party pricing service providers regarding the valuation inputs and methodology used for each category of securities.

When pricing is unavailable from third-party pricing service providers for certain securities, the Company requests market quotes from various independent external brokers and utilizes the average quoted market prices. These valuations are based on observable inputs in the current marketplace and are classified as Level 2. The Company periodically communicates with the independent external brokers to validate their pricing methodology. Information such as pricing sources, pricing assumptions, data inputs and valuation technique are reviewed.

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Equity Securities — Equity securities consisted of mutual funds as of both June 30, 2020 and December 31, 2019. The Company uses net asset value (“NAV”) information to determine the fair value of these equity securities. When NAV is available periodically and the equity securities can be put back to the transfer agents at the publicly available NAV, the fair value of the equity securities is classified as Level 1. When NAV is available periodically but the equity securities may not be readily marketable at its periodic NAV in the secondary market, the fair value of these equity securities is classified as Level 2.

Interest Rate Contracts — The Company enters into interest rate swap and option contracts with its borrowers to lock in attractive intermediate and long-term interest rates, resulting in the customer obtaining a synthetic fixed-rate loan. To economically hedge against the interest rate risks in the products offered to its customers, the Company enters into mirrored offsetting interest rate contracts with third-party financial institutions. The Company also enters into interest rate swap contracts with institutional counterparties to hedge against certificates of deposit issued and certain variable interest rate borrowings. The fair value of the interest rate swaps is determined using the market standard methodology of netting the discounted future fixed cash payments (or receipts) and the discounted expected variable cash receipts (or payments). The fair value of the interest rate options, which consist of floors and caps, is determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates fall below (rise above) the strike rate of the floors (caps). In addition, to comply with the provisions of ASC 820, Fair Value Measurement, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements of its derivatives. The credit valuation adjustments associated with the Company’s derivatives utilize model-derived credit spreads, which are Level 3 inputs. As of June 30, 2020 and December 31, 2019, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of these interest rate contracts and has determined that the credit valuation adjustments were not significant to the overall valuation of its derivative portfolios. As a result, the Company classifies these derivative instruments as Level 2 due to the observable nature of the significant inputs utilized.

Foreign Exchange Contracts — The Company enters into foreign exchange contracts to accommodate the business needs of its customers. For a majority of the foreign exchange contracts entered with its customers, the Company entered into offsetting foreign exchange contracts with third-party financial institutions to manage its exposure. The Company also utilizes foreign exchange contracts that are not designated as hedging instruments to mitigate the economic effect of fluctuations in certain foreign currency on-balance sheet assets and liabilities, primarily foreign currency denominated deposits that it offers to its customers. The fair value is determined at each reporting period based on changes in the foreign exchange rates. These are over-the-counter contracts where quoted market prices are not readily available. Valuation is measured using conventional valuation methodologies with observable market data. Due to the short-term nature of the majority of these contracts, the counterparties’ credit risks are considered nominal and result in no adjustments to the valuation of the foreign exchange contracts. Due to the observable nature of the inputs used in deriving the fair value of these contracts, the valuation of foreign exchange contracts are classified as Level 2. As of June 30, 2020 and December 31, 2019, the Bank held foreign currency non-deliverable forward contracts to hedge its net investment in its China subsidiary, East West Bank (China) Limited, a non-U.S. dollar (“USD”) functional currency subsidiary in China. These foreign currency non-deliverable forward contracts were designated as net investment hedges. The fair value of foreign currency contracts is determined by comparing the contracted foreign exchange rate to the current market foreign exchange rate. Key inputs of the current market exchange rate include spot rates and forward rates of the contractual currencies. Foreign exchange forward curves are used to determine which forward rate pertains to a specific maturity. Due to the observable nature of the inputs used in deriving the estimated fair value, these instruments are classified as Level 2.

Credit Contracts — The Company may periodically enter into credit risk participation agreements (“RPAs”) to manage the credit exposure on interest rate contracts associated with the syndicated loans. The Company may enter into protection sold or protection purchased RPAs with institutional counterparties. The fair value of RPAs is calculated by determining the total expected asset or liability exposure of the derivatives to the borrowers and applying the borrowers’ credit spread to that exposure. Total expected exposure incorporates both the current and potential future exposure of the derivatives, derived from using observable inputs, such as yield curves and volatilities. The majority of the inputs used to value the RPAs are observable. Accordingly, RPAs fall within Level 2.

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Equity Contracts — As part of the loan origination process, from time to time, the Company obtains warrants to purchase preferred and/or common stock of technology and life sciences companies it provides loans to. As of June 30, 2020 and December 31, 2019, the warrants included on the Consolidated Financial Statements were from both public and private companies. The Company values these warrants based on the Black-Scholes option pricing model. For warrants from public companies, the model uses the underlying stock price, stated strike price, warrant expiration date, risk-free interest rate based on a duration-matched U.S. Treasury rate and market-observable company-specific option volatility as inputs to value the warrants. Due to the observable nature of the inputs used in deriving the estimated fair value, warrants from public companies are classified as Level 2. For warrants from private companies, the model uses inputs such as the offering price observed in the most recent round of funding, stated strike price, warrant expiration date, risk-free interest rate based on duration-matched U.S. Treasury rate and option volatility. The Company applies proxy volatilities based on the industry sectors of the private companies. The model values are then adjusted for a general lack of liquidity due to the private nature of the underlying companies. Due to the unobservable nature of the option volatility and liquidity discount assumptions used in deriving the estimated fair value, warrants from private companies are classified as Level 3. Since both option volatility and liquidity discount assumptions are subject to management’s judgment, measurement uncertainty is inherent in the valuation of private companies’ warrants. Given that the Company holds long positions in all warrants, an increase in volatility assumption would generally result in an increase in fair value. A higher liquidity discount would result in a decrease in fair value. On a quarterly basis, the changes in the fair value of warrants from private companies are reviewed for reasonableness, and a measurement uncertainty analysis on the option volatility and liquidity discount assumptions is performed.

Commodity Contracts — The Company enters into energy commodity contracts in the form of swaps and options with its commercial loan customers to allow them to hedge against the risk of fluctuation in energy commodity prices. The fair value of the commodity option contracts is determined using the Black-Scholes model and assumptions that include expectations of future commodity price and volatility. The future commodity contract price is derived from observable inputs such as the market price of the commodity. Commodity swaps are structured as an exchange of fixed cash flows for floating cash flows. The fixed cash flows are predetermined based on the known volumes and fixed price as specified in the swap agreement. The floating cash flows are correlated with the change of forward commodity prices, which is derived from market corroborated futures settlement prices. The fair value of the commodity swaps is determined using the market standard methodology of netting the discounted future fixed cash payments (or receipts) and the discounted expected variable cash receipts (or payments) based on the market prices of the commodity. As a result, the Company classifies these derivative instruments as Level 2 due to the observable nature of the significant inputs utilized.

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The following tables present financial assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2020 and December 31, 2019:

($ in thousands)						Assets and Liabilities Measured at Fair Value on a Recurring Basis as of June 30, 2020
									Quoted Prices in Active Markets for Identical Assets (Level 1)						Significant Other Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)						Total Fair Value
AFS debt securities:
U.S. Treasury securities						$	251,201					$	—					$	—					$	251,201
U.S. government agency and U.S. government- sponsored enterprise debt securities						—						442,644						—						442,644
U.S. government agency and U.S. government- sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities						—						858,440						—						858,440
Residential mortgage-backed securities						—						1,280,895						—						1,280,895
Municipal securities						—						215,184						—						215,184
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities						—						151,368						—						151,368
Residential mortgage-backed securities						—						114,338						—						114,338
Corporate debt securities						—						30,826						—						30,826
Foreign bonds						—						204,080						—						204,080
Asset-backed securities						—						61,619						—						61,619
Collateralized loan obligations (“CLOs”)						—						273,979						—						273,979
Total AFS debt securities						$	251,201					$	3,633,373					$	—					$	3,884,574
Investments in tax credit and other investments:
Equity securities (1)						$	22,462					$	8,680					$	—					$	31,142
Total investments in tax credit and other investments						$	22,462					$	8,680					$	—					$	31,142
Derivative assets:
Interest rate contracts						$	—					$	613,480					$	—					$	613,480
Foreign exchange contracts						—						24,289						—						24,289
Credit contracts						—						41						—						41
Equity contracts						—						8,857						316						9,173
Commodity contracts						—						117,447						—						117,447
Gross derivative assets						$	—					$	764,114					$	316					$	764,430
Netting adjustments (2)						$	—					$	(122,218)					$	—					$	(122,218)
Net derivative assets						$	—					$	641,896					$	316					$	642,212
Derivative liabilities:
Interest rate contracts						$	—					$	401,803					$	—					$	401,803
Foreign exchange contracts						—						19,741						—						19,741
Credit contracts						—						327						—						327
Commodity contracts						—						138,298						—						138,298
Gross derivative liabilities						$	—					$	560,169					$	—					$	560,169
Netting adjustments (2)						$	—					$	(205,004)					$	—					$	(205,004)
Net derivative liabilities						$	—					$	355,165					$	—					$	355,165

(1)Equity securities consist of mutual funds with readily determinable fair values.

(2)Represents balance sheet netting of derivative assets and liabilities and related cash collateral under master netting agreements or similar agreements. See Note 6 — Derivatives to the Consolidated Financial Statements in this Form 10-Q for additional information.

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($ in thousands)						Assets and Liabilities Measured at Fair Value on a Recurring Basis as of December 31, 2019
									Quoted Prices in Active Markets for Identical Assets (Level 1)						Significant Other Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)						Total Fair Value
AFS debt securities:
U.S. Treasury securities						$	176,422					$	—					$	—					$	176,422
U.S. government agency and U.S. government- sponsored enterprise debt securities						—						581,245						—						581,245
U.S. government agency and U.S. government- sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities						—						603,471						—						603,471
Residential mortgage-backed securities						—						1,003,897						—						1,003,897
Municipal securities						—						102,302						—						102,302
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities						—						88,550						—						88,550
Residential mortgage-backed securities						—						46,548						—						46,548
Corporate debt securities						—						11,149						—						11,149
Foreign bonds						—						354,172						—						354,172
Asset-backed securities						—						64,752						—						64,752
CLOs						—						284,706						—						284,706
Total AFS debt securities						$	176,422					$	3,140,792					$	—					$	3,317,214
Investments in tax credit and other investments:
Equity securities (1)						$	21,746					$	9,927					$	—					$	31,673
Total investments in tax credit and other investments						$	21,746					$	9,927					$	—					$	31,673
Derivative assets:
Interest rate contracts						$	—					$	192,883					$	—					$	192,883
Foreign exchange contracts						—						54,637						—						54,637
Credit contracts						—						2						—						2
Equity contracts						—						993						421						1,414
Commodity contracts						—						81,380						—						81,380
Gross derivative assets						$	—					$	329,895					$	421					$	330,316
Netting adjustments (2)						$	—					$	(125,319)					$	—					$	(125,319)
Net derivative assets						$	—					$	204,576					$	421					$	204,997
Derivative liabilities:
Interest rate contracts						$	—					$	127,317					$	—					$	127,317
Foreign exchange contracts						—						48,610						—						48,610
Credit contracts						—						84						—						84
Commodity contracts						—						80,517						—						80,517
Gross derivative liabilities						$	—					$	256,528					$	—					$	256,528
Netting adjustments (2)						$	—					$	(159,799)					$	—					$	(159,799)
Net derivative liabilities						$	—					$	96,729					$	—					$	96,729

(1)Equity securities consist of mutual funds with readily determinable fair values.

(2)Represents balance sheet netting of derivative assets and liabilities and related cash collateral under master netting agreements or similar agreements. See Note 6 — Derivatives to the Consolidated Financial Statements in this Form 10-Q for additional information.

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For the three and six months ended June 30, 2020 and 2019, Level 3 fair value measurements that were measured on a recurring basis consist of warrants issued by private companies. The following table provides a reconciliation of the beginning and ending balances of these equity warrants for the three and six months ended June 30, 2020 and 2019:

($ in thousands)						Three Months Ended June 30,																		Six Months Ended June 30,
									2020						2019						2020						2019
Equity Contracts
Beginning balance						$	713					$	442					$	421					$	673
Total gains included in earnings (1)						7,976						769						8,268						538
Issuances						—						28						—						28
Settlements						—						(847)						—						(847)
Transfers out of Level 3 (2)						(8,373)						—						(8,373)						—
Ending balance						$	316					$	392					$	316					$	392

(1)Includes unrealized gains (losses) of $8.0 million and $(4) thousand for the three months ended June 30, 2020 and 2019, respectively, and $8.3 million and $(235) thousand for the six months ended June 30, 2020 and 2019, respectively. The realized/unrealized gains (losses) of equity warrants are included in Lending fees on the Consolidated Statement of Income.

(2)During the three and six months ended June 30, 2020, the Company transferred $8.4 million of equity contracts measured on a recurring basis out of Level 3 into Level 2 after the corresponding issuer of the equity warrant, which was previously a private company, completed its initial public offering and became a public company.

The following table presents quantitative information about the significant unobservable inputs used in the valuation of Level 3 fair value measurements as of June 30, 2020 and December 31, 2019, respectively. The significant unobservable inputs presented in the table below are those that the Company considers significant to the fair value of the Level 3 assets. The Company considers unobservable inputs to be significant if, by their exclusion, the fair value of the Level 3 assets would be impacted by a predetermined percentage change.

($ in thousands)						Fair Value Measurements (Level 3)						Valuation Technique						Unobservable Inputs						Range of Inputs						Weighted- Average (1)
June 30, 2020
Derivative assets:
Equity contracts						$	316					Black-Scholes option pricing model						Equity volatility						58% — 70%						63%
																		Liquidity discount						47%						47%
December 31, 2019
Derivative assets:
Equity contracts						$	421					Black-Scholes option pricing model						Equity volatility						39% — 44%						42%
																		Liquidity discount						47%						47%

(1)Weighted-average is calculated based on fair value of equity warrants as of June 30, 2020 and December 31, 2019.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

Assets measured at fair value on a nonrecurring basis include certain loans, investments in qualified affordable housing partnerships, tax credit and other investments, OREO, loans held-for-sale, and other nonperforming assets. Nonrecurring fair value adjustments result from impairment on certain loans and investments in qualified affordable housing partnerships, tax credit and other investments, write-downs of OREO, or from the application of lower of cost or fair value on loans held-for-sale.

Individually Evaluated Loans — The Company typically adjusts the carrying amount of individually evaluated loans when there is evidence of probable loss and when the expected fair value of the loan is less than its carrying amount. Individually evaluated loans with specific reserves are classified as Level 3 assets. The following two methods are used to derive the fair value of individually evaluated loans:

•Discounted cash flows valuation techniques that consist of developing an expected stream of cash flows over the life of the loans and then valuing the loans at the present value by discounting the expected cash flows at a designated discount rate.

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•A specific reserve is established for an individually evaluated loan based on the fair value of the underlying collateral, which may take the form of real estate, inventory, equipment, contracts or guarantees. The fair value of the underlying collateral is generally based on third-party appraisals, or an internal valuation if a third-party appraisal is not required by regulations, which utilize one or more valuation techniques such as income, market and/or cost approaches.

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net — As part of its monitoring process, the Company conducts ongoing due diligence on the investments in its qualified affordable housing partnerships, tax credit and other investments after the initial investment date and prior to the placed-in-service-date. After these investments are either acquired or placed into service, periodic monitoring is performed. This includes the quarterly review of the financial statements of the investment entity, the annual review of the financial statements of the guarantor (if any), the review of the annual tax returns of the investment entity, and the comparison of the actual cash distributions received against the financial projections prepared at the time when the investment was made. The Company assesses its tax credit and other investments for possible OTTI on an annual basis or when events or circumstances suggest that the carrying amount of the investments may not be realizable. These circumstances can include, but are not limited to the following factors:

•The expected future cash flows is less than the carrying amount of the investment;

•Changes in the economic, market or technological environment that could adversely affect the investee’s operations; and

•Other factors that raise doubt about the investee’s ability to continue as a going concern, such as negative cash flows from operations and the continuing prospects of the underlying operations of the investment.

All available evidence is considered in assessing whether a decline in value is other-than-temporary. Generally, none of the aforementioned factors are individually conclusive and the relative importance placed on individual facts may vary depending on the situation. In accordance with ASC 323-10-35-32, an impairment charge would only be recognized in earnings for a decline in value that is determined to be other-than-temporary.

Other Real Estate Owned — The Company’s OREO represents properties acquired through foreclosure, or through full or partial satisfaction of loans held-for-investment. These OREO properties are recorded at estimated fair value less the costs to sell at the time of foreclosure or at the lower of cost or estimated fair value less the costs to sell subsequent to acquisition. On a monthly basis, the current fair market value of each OREO property is reviewed to ensure that the current carrying value is appropriate. OREO properties are classified as Level 3.

Other Nonperforming Assets — Other nonperforming assets are recorded at fair value upon transfers from loans to foreclosed assets. Subsequently, foreclosed assets are recorded at the lower of carrying value or fair value. Fair value is based on independent market prices, appraised values of the collateral or management’s estimates of the foreclosed asset. The Company records an impairment when the foreclosed asset’s fair value declines below its carrying value. Other nonperforming assets are classified as Level 3.

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The following tables present the carrying amounts of assets that were still held and had fair value changes measured on a nonrecurring basis as of June 30, 2020 and December 31, 2019:

($ in thousands)						Assets Measured at Fair Value on a Nonrecurring Basis as of June 30, 2020
									Quoted Prices in Active Markets for Identical Assets (Level 1)						Significant Other Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)						Fair Value Measurements
Individually evaluated loans (1):
Commercial:
C&I						$	—					$	—					$	53,122					$	53,122
CRE:
CRE						—						—						50,453						50,453
Total commercial						—						—						103,575						103,575
Consumer:
Residential mortgage:
HELOCs						—						—						3,338						3,338
Other consumer						—						—						2,491						2,491
Total consumer						—						—						5,829						5,829
Total individually evaluated loans						$	—					$	—					$	109,404					$	109,404
Investments in tax credit and other investments, net						$	—					$	—					$	6,216					$	6,216

($ in thousands)						Assets Measured at Fair Value on a Nonrecurring Basis as of December 31, 2019
									Quoted Prices in Active Markets for Identical Assets (Level 1)						Significant Other Observable Inputs (Level 2)						Significant Unobservable Inputs (Level 3)						Fair Value Measurements
Non-PCI impaired loans:
Commercial:
C&I						$	—					$	—					$	47,554					$	47,554
CRE:
CRE						—						—						753						753
Total commercial						—						—						48,307						48,307
Consumer:
Residential mortgage:
HELOCs						—						—						1,372						1,372
Total consumer						—						—						1,372						1,372
Total non-PCI impaired loans						$	—					$	—					$	49,679					$	49,679
OREO (2)						$	—					$	—					$	125					$	125
Investments in tax credit and other investments, net						$	—					$	—					$	3,076					$	3,076
Other nonperforming assets						$	—					$	—					$	1,167					$	1,167

(1)The Company adopted ASU 2016-13 using the prospective transition approach for PCD loans that were previously accounted for as PCI loans. Total individually evaluated loans as of June 30, 2020 considers PCD loans, if impaired, whereas the impaired loans as of December 31, 2019 include only non-PCI loans.

(2)Amounts are included in Other assets on the Consolidated Balance Sheet and represent the carrying value of OREO properties that were written down subsequent to their initial classification as OREO.

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The following table presents the increase (decrease) in fair value of assets for which a nonrecurring fair value adjustment has been recognized for the three and six months ended June 30, 2020 and 2019:

($ in thousands)						Three Months Ended June 30,																		Six Months Ended June 30,
									2020						2019						2020						2019
									Individually Evaluated Loans (1)						Non-PCI Impaired Loans						Individually Evaluated Loans (1)						Non-PCI Impaired Loans
Loans:
Commercial:
C&I						$	(8,846)					$	(24,001)					$	(30,372)					$	(25,823)
CRE:
CRE						(271)						2						(276)						4
Total commercial						(9,117)						(23,999)						(30,648)						(25,819)
Consumer:
Residential mortgage:
HELOCs						(64)						—						(257)						—
Other consumer						—						—						2,491						—
Total consumer						(64)						—						2,234						—
Total loans						$	(9,181)					$	(23,999)					$	(28,414)					$	(25,819)
OREO						$	—					$	(3)					$	—					$	(3)
Investments in tax credit and other investments, net						$	(733)					$	(2,892)					$	(583)					$	(9,870)
Other nonperforming assets						$	—					$	—					$	—					$	(3,000)

(1)The Company adopted ASU 2016-13 using the prospective transition approach for PCD loans that were previously accounted for as PCI loans. Total individually evaluated loans during the three and six months ended June 30, 2020 considers PCD loans, if impaired, whereas impaired loans during the three and six months ended June 30, 2019 include only non-PCI loans.

The following table presents the quantitative information about the significant unobservable inputs used in the valuation of Level 3 fair value measurements that are measured on a nonrecurring basis as of June 30, 2020 and December 31, 2019:

($ in thousands)						Fair Value Measurements (Level 3)						Valuation Techniques						Unobservable Inputs						Range of  Inputs						Weighted- Average of Inputs (1)
June 30, 2020
Individually evaluated loans (2)						$	29,949					Discounted cash flows						Discount						4% — 15%						10%
						$	5,658					Fair value of collateral						Discount						10% — 63%						19%
						$	21,452					Fair value of collateral						Contract value						NM						NM
						$	52,345					Fair value of property						Selling cost						8%						8%
Investments in tax credit and other investments, net						$	6,216					Individual analysis of each investment						Expected future tax benefits and distributions						NM						NM
December 31, 2019
Non-PCI impaired loans						$	27,841					Discounted cash flows						Discount						4% — 15%						14%
						$	1,014					Fair value of collateral						Discount						8% — 20%						19%
						$	20,824					Fair value of collateral						Contract value						NM						NM
OREO						$	125					Fair value of property						Selling cost						8%						8%
Other nonperforming assets						$	1,167					Fair value of collateral						Contract value						NM						NM
Investments in tax credit and other investments, net						$	3,076					Individual analysis of each investment						Expected future tax benefits and distributions						NM						NM

NM — Not meaningful.

(1)Weighted-average of inputs is based on the relative fair value of the respective assets as of June 30, 2020 and December 31, 2019.

(2)The Company adopted ASU 2016-13 using the prospective transition approach for PCD loans that were previously accounted for as PCI loans. Total individually evaluated loans as of June 30, 2020 considers PCD loans, if impaired, whereas the impaired loans as of December 31, 2019 include only non-PCI loans.

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Disclosures about Fair Value of Financial Instruments

The following tables present the fair value estimates for financial instruments as of June 30, 2020 and December 31, 2019, excluding financial instruments recorded at fair value on a recurring basis as they are included in the tables presented elsewhere in this Note. The carrying amounts in the following tables are recorded on the Consolidated Balance Sheet under the indicated captions, except for accrued interest receivable and mortgage servicing rights that are included in Other assets, and accrued interest payable that is included in Accrued expenses and other liabilities. These financial assets and liabilities are measured at amortized cost basis on the Company’s Consolidated Balance Sheet.

($ in thousands)						June 30, 2020
									Carrying Amount						Level 1						Level 2						Level 3						Estimated Fair Value
Financial assets:
Cash and cash equivalents						$	4,533,502					$	4,533,502					$	—					$	—					$	4,533,502
Interest-bearing deposits with banks						$	531,591					$	—					$	531,591					$	—					$	531,591
Resale agreements (1)						$	1,260,000					$	—					$	1,263,068					$	—					$	1,263,068
Restricted equity securities, at cost						$	78,963					$	—					$	78,963					$	—					$	78,963
Loans held-for-sale						$	3,875					$	—					$	3,875					$	—					$	3,875
Loans held-for-investment, net						$	36,597,341					$	—					$	—					$	36,714,052					$	36,714,052
Mortgage servicing rights						$	5,363					$	—					$	—					$	7,798					$	7,798
Accrued interest receivable						$	149,595					$	—					$	149,595					$	—					$	149,595
Financial liabilities:
Demand, checking, savings and money market deposits						$	31,410,130					$	—					$	31,410,130					$	—					$	31,410,130
Time deposits						$	9,262,548					$	—					$	9,295,199					$	—					$	9,295,199
Short-term borrowings						$	252,851					$	—					$	252,851					$	—					$	252,851
FHLB advances						$	656,759					$	—					$	667,996					$	—					$	667,996
Repurchase agreements (1)						$	300,000					$	—					$	320,361					$	—					$	320,361
Long-term debt						$	1,575,653					$	—					$	1,578,801					$	—					$	1,578,801
Accrued interest payable						$	23,007					$	—					$	23,007					$	—					$	23,007

($ in thousands)						December 31, 2019
									Carrying Amount						Level 1						Level 2						Level 3						Estimated Fair Value
Financial assets:
Cash and cash equivalents						$	3,261,149					$	3,261,149					$	—					$	—					$	3,261,149
Interest-bearing deposits with banks						$	196,161					$	—					$	196,161					$	—					$	196,161
Resale agreements (1)						$	860,000					$	—					$	856,025					$	—					$	856,025
Restricted equity securities, at cost						$	78,580					$	—					$	78,580					$	—					$	78,580
Loans held-for-sale						$	434					$	—					$	434					$	—					$	434
Loans held-for-investment, net						$	34,420,252					$	—					$	—					$	35,021,300					$	35,021,300
Mortgage servicing rights						$	6,068					$	—					$	—					$	8,199					$	8,199
Accrued interest receivable						$	144,599					$	—					$	144,599					$	—					$	144,599
Financial liabilities:
Demand, checking, savings and money market deposits						$	27,109,951					$	—					$	27,109,951					$	—					$	27,109,951
Time deposits						$	10,214,308					$	—					$	10,208,895					$	—					$	10,208,895
Short-term borrowings						$	28,669					$	—					$	28,669					$	—					$	28,669
FHLB advances						$	745,915					$	—					$	755,371					$	—					$	755,371
Repurchase agreements (1)						$	200,000					$	—					$	232,597					$	—					$	232,597
Long-term debt						$	147,101					$	—					$	152,641					$	—					$	152,641
Accrued interest payable						$	27,246					$	—					$	27,246					$	—					$	27,246

(1)Resale and repurchase agreements are reported net pursuant to ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements. As of June 30, 2020, none of the $300.0 million of gross repurchase agreements were eligible for netting against gross resale agreements. Out of $450.0 million of gross repurchase agreements, $250.0 million were eligible for netting against gross resale agreements as of December 31, 2019.

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Note 4 — Securities Purchased under Resale Agreements and Sold under Repurchase Agreements

Resale Agreements

Gross resale agreements were $1.26 billion and $1.11 billion as of June 30, 2020 and December 31, 2019, respectively. The weighted-average yields were 2.14% and 2.71% for the three months ended June 30, 2020 and 2019, respectively, and 2.32% and 2.77% for the six months ended June 30, 2020 and 2019, respectively.

Repurchase Agreements

As of June 30, 2020, the collateral for the repurchase agreements were comprised of U.S. Treasury securities, and U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities. Gross repurchase agreements were $300.0 million and $450.0 million as of June 30, 2020 and December 31, 2019, respectively. The weighted-average interest rates were 3.40% and 4.93% for the three months ended June 30, 2020 and 2019, respectively, and 3.76% and 4.97% for the six months ended June 30, 2020 and 2019, respectively. The Company recorded $8.7 million of charges related to the extinguishment of $150.0 million of repurchase agreements for the three and six months ended June 30, 2020. In comparison, there were no extinguishment charges recorded in 2019. As of June 30, 2020, $300.0 million of repurchase agreements will mature in 2023.

Balance Sheet Offsetting

The Company’s resale and repurchase agreements are transacted under legally enforceable master repurchase agreements that provide the Company, in the event of default by the counterparty, the right to liquidate securities held and to offset receivables and payables with the same counterparty. The Company nets resale and repurchase transactions with the same counterparty on the Consolidated Balance Sheet when it has a legally enforceable master netting agreement and the transactions are eligible for netting under ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements. Collateral received includes securities that are not recognized on the Consolidated Balance Sheet. Collateral pledged consists of securities that are not netted on the Consolidated Balance Sheet against the related collateralized liability. Collateral received or pledged in resale and repurchase agreements with other financial institutions may also be sold or re-pledged by the secured party, and is usually delivered to and held by the third-party trustees. The collateral amounts received/pledged are limited for presentation purposes to the related recognized asset/liability balance for each counterparty, and accordingly, do not include excess collateral received/pledged.

The following tables present the resale and repurchase agreements included on the Consolidated Balance Sheet as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020
						Gross Amounts of Recognized Assets						Gross Amounts Offset on the Consolidated Balance Sheet						Net Amounts of Assets Presented on the Consolidated Balance Sheet						Gross Amounts Not Offset on the Consolidated Balance Sheet
Assets																																										Net Amount
																																				Collateral Received
Resale agreements						$	1,260,000					$	—					$	1,260,000					$	(1,258,866)		(1)			$	1,134
						Gross Amounts of Recognized Liabilities						Gross Amounts Offset on the Consolidated Balance Sheet						Net Amounts of Liabilities Presented on the Consolidated Balance Sheet						Gross Amounts Not Offset on the Consolidated Balance Sheet
Liabilities																																										Net Amount
																																				Collateral Pledged
Repurchase agreements						$	300,000					$	—					$	300,000					$	(300,000)		(2)			$	—

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($ in thousands)						December 31, 2019
						Gross Amounts of Recognized Assets						Gross Amounts Offset on the Consolidated Balance Sheet						Net Amounts of Assets Presented on the Consolidated Balance Sheet						Gross Amounts Not Offset on the Consolidated Balance Sheet
Assets																																										Net Amount
																																				Collateral Received
Resale agreements						$	1,110,000					$	(250,000)					$	860,000					$	(856,058)		(1)			$	3,942
						Gross Amounts of Recognized Liabilities						Gross Amounts Offset on the Consolidated Balance Sheet						Net Amounts of Liabilities Presented on the Consolidated Balance Sheet						Gross Amounts Not Offset on the Consolidated Balance Sheet
Liabilities																																										Net Amount
																																				Collateral Pledged
Repurchase agreements						$	450,000					$	(250,000)					$	200,000					$	(200,000)		(2)			$	—

(1)Represents the fair value of securities the Company has received under resale agreements, limited for table presentation purposes to the amount of the recognized asset due from each counterparty. The application of collateral cannot reduce the net position below zero. Therefore, excess collateral, if any, is not reflected above.

(2)Represents the fair value of securities the Company has pledged under repurchase agreements, limited for table presentation purposes to the amount of the recognized liability due to each counterparty. The application of collateral cannot reduce the net position below zero. Therefore, excess collateral, if any, is not reflected above.

In addition to the amounts included in the tables above, the Company also has balance sheet netting related to derivatives. Refer to Note 6 — Derivatives to the Consolidated Financial Statements in this Form 10-Q for additional information.

Note 5 — Securities

The following tables present the amortized cost, gross unrealized gains and losses, and fair value by major categories of AFS debt securities as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020
									Amortized Cost												Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
AFS debt securities:
U.S. Treasury securities						$	250,494											$	707					$	—					$	251,201
U.S. government agency and U.S. government-sponsored enterprise debt securities						433,923												8,853						(132)						442,644
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities						827,929												34,585						(4,074)						858,440
Residential mortgage-backed securities						1,246,609												34,445						(159)						1,280,895
Municipal securities						208,333												7,002						(151)						215,184
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities						148,322												3,989						(943)						151,368
Residential mortgage-backed securities						113,548												804						(14)						114,338
Corporate debt securities						31,254												74						(502)						30,826
Foreign bonds						204,540												106						(566)						204,080
Asset-backed securities						64,762												—						(3,143)						61,619
CLOs						294,000												—						(20,021)						273,979
Total AFS debt securities						$	3,823,714											$	90,565					$	(29,705)					$	3,884,574

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($ in thousands)						December 31, 2019
									Amortized Cost												Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
AFS debt securities:
U.S. Treasury securities						$	177,215											$	—					$	(793)					$	176,422
U.S. government agency and U.S. government-sponsored enterprise debt securities						584,275												1,377						(4,407)						581,245
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities						599,814												8,551						(4,894)						603,471
Residential mortgage-backed securities						998,447												6,927						(1,477)						1,003,897
Municipal securities						101,621												790						(109)						102,302
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities						86,609												1,947						(6)						88,550
Residential mortgage-backed securities						46,830												3						(285)						46,548
Corporate debt securities						11,250												12						(113)						11,149
Foreign bonds						354,481												198						(507)						354,172
Asset-backed securities						66,106												—						(1,354)						64,752
CLOs						294,000												—						(9,294)						284,706
Total AFS debt securities						$	3,320,648											$	19,805					$	(23,239)					$	3,317,214

As of June 30, 2020, the amortized cost of AFS debt securities excludes accrued interest receivables of $17.8 million which are included in Other assets on the Consolidated Balance Sheet. For the Company’s accounting policy related to AFS debt securities’ accrued interest receivable, see Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Form 10-Q.

Unrealized Losses

The following tables present the fair value and the associated gross unrealized losses of the Company’s AFS debt securities, aggregated by investment category and the length of time that the securities have been in a continuous unrealized loss position as of June 30, 2020 and December 31, 2019.

($ in thousands)						June 30, 2020
									Less Than 12 Months																		12 Months or More																		Total
									Fair Value						Gross Unrealized Losses						Fair Value						Gross Unrealized Losses						Fair Value						Gross Unrealized Losses
AFS debt securities:
U.S. government agency and U.S. government sponsored enterprise debt securities						$	24,868					$	(132)					$	—					$	—					$	24,868					$	(132)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities						139,097						(3,477)						11,572						(597)						150,669						(4,074)
Residential mortgage-backed securities						91,491						(157)						195						(2)						91,686						(159)
Municipal securities						8,617						(151)						—						—						8,617						(151)
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities						59,418						(943)						—						—						59,418						(943)
Residential mortgage-backed securities						23,720						(14)						—						—						23,720						(14)
Corporate debt securities						1,002						(2)						9,500						(500)						10,502						(502)
Foreign bonds						85,274						(566)						—						—						85,274						(566)
Asset-backed securities						18,359						(483)						43,260						(2,660)						61,619						(3,143)
CLOs						273,979						(20,021)						—						—						273,979						(20,021)
Total AFS debt securities						$	725,825					$	(25,946)					$	64,527					$	(3,759)					$	790,352					$	(29,705)

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($ in thousands)						December 31, 2019
									Less Than 12 Months																		12 Months or More																		Total
									Fair Value						Gross Unrealized Losses						Fair Value						Gross Unrealized Losses						Fair Value						Gross Unrealized Losses
AFS debt securities:
U.S. Treasury securities						$	—					$	—					$	176,422					$	(793)					$	176,422					$	(793)
U.S. government agency and U.S. government-sponsored enterprise debt securities						310,349						(4,407)						—						—						310,349						(4,407)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities:
Commercial mortgage-backed securities						204,675						(2,346)						108,314						(2,548)						312,989						(4,894)
Residential mortgage-backed securities						325,354						(1,234)						34,337						(243)						359,691						(1,477)
Municipal securities						31,130						(109)						—						—						31,130						(109)
Non-agency mortgage-backed securities:
Commercial mortgage-backed securities						7,914						(6)						—						—						7,914						(6)
Residential mortgage-backed securities						42,894						(285)						—						—						42,894						(285)
Corporate debt securities						—						—						9,888						(113)						9,888						(113)
Foreign bonds						129,074						(407)						9,900						(100)						138,974						(507)
Asset-backed securities						52,565						(902)						12,187						(452)						64,752						(1,354)
CLOs						284,706						(9,294)						—						—						284,706						(9,294)
Total AFS debt securities						$	1,388,661					$	(18,990)					$	351,048					$	(4,249)					$	1,739,709					$	(23,239)

As of June 30, 2020, the Company had 41 AFS debt securities in a gross unrealized loss position with no credit impairment, primarily consisting of three CLOs, 19 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities, and four asset-backed securities. In comparison, as of December 31, 2019, the Company had 101 AFS debt securities in a gross unrealized loss position with no credit impairment, primarily consisting of three CLOs, 57 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities, and 14 U.S. government agency and U.S. government-sponsored enterprise debt securities.

Allowance for Credit Losses

Each reporting period, the Company assesses each AFS debt security that is in an unrealized loss position to determine whether the decline in fair value below the amortized cost basis resulted from a credit loss or other factors. For a discussion of the factors and criteria the Company uses in analyzing securities for impairment related to credit losses, see Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies — Allowance for Credit Losses on Available-for-Sale Debt Securities to the Consolidated Financial Statements in this Form 10-Q. Prior to January 1, 2020, the Company assessed individual securities that were in an unrealized loss position for OTTI.

The gross unrealized losses across all major security types presented in the above tables were primarily attributable to yield curve movements and widened spreads arising from the negative outlook and uncertainty as a result of the COVID-19 pandemic. The increase in unrealized losses during the six months ended June 30, 2020 was primarily due to further deterioration in the market values of the following security types:

•U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities — The market value decline was primarily due to the interest rate movement. Since these securities were guaranteed or sponsored by agencies of the U.S. government, and the credit profiles were strong (rated A, AA+ and AAA by Moody’s Investors Service (“Moody’s”), S&P and Fitch Ratings (“Fitch”), respectively), the Company expects to receive all contractual interest payments on-time, and believes the credit loss exposure on these securities is remote.

•Asset-backed securities — The market value decline of these securitized student loans was primarily due to the interest rate movement and the widening in spreads. Since credit profiles of these securities were strong (rated Aa1, AA+, and AA or higher by Moody’s Investors Service, S&P and Fitch Ratings, respectively), were backed by the Federal Family Education Loan Program, and the contractual payments from these bonds have been on-time, the Company deemed that the credit loss exposure on these securities is low and no credit loss is expected.

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•CLOs — The market value decline was largely due to market dislocation in this sector resulting in wider liquidity spreads. The credit profiles of the securities were strong (rated A or higher by Standard and Poor's (“S&P”)) and the contractual payments from these bonds are expected to be received on-time. Accordingly, the Company believes that credit loss exposure on these securities is remote.

Overall, the Company believes that the credit support levels of the AFS debt securities are strong and, based on current assessments and macroeconomic forecasts, expects that full contractual cash flows will be received even if credit performance deteriorates under the impact of the COVID-19 pandemic.

As of June 30, 2020, the Company has the intent to hold the AFS debt securities with unrealized losses through the anticipated recovery period and it is more-likely-than-not that the Company will not have to sell these securities before recovery of their amortized cost. The issuers of these securities have not, to the Company’s knowledge, established any cause for default on these securities. As a result, the Company expects to recover the entire amortized cost basis of these securities. Accordingly, there was no allowance for credit losses as of June 30, 2020, and there were no provision for credit losses recognized for the three and six months ended June 30, 2020. In comparison, no OTTI credit loss was recognized for the three and six months ended June 30, 2019.

Realized Gains and Losses

The following table presents the proceeds, gross realized gains and tax expense related to the sales of AFS debt securities for the three and six months ended June 30, 2020 and 2019:

($ in thousands)						Three Months Ended June 30,																		Six Months Ended June 30,
									2020						2019						2020						2019
Proceeds from sales						$	177,917					$	223,763					$	484,380					$	375,102
Gross realized gains						$	9,640					$	1,447					$	11,169					$	3,008
Related tax expense						$	2,850					$	428					$	3,302					$	889

Contractual Maturities of Available-for-Sale Debt Securities

The following table presents the contractual maturities of AFS debt securities as of June 30, 2020. Expected maturities will differ from contractual maturities on certain securities as the issuers and borrowers of the underlying collateral may have the right to call or prepay obligations with or without prepayment penalties.

($ in thousands)						Amortized Cost						Fair Value
Due within one year						$	561,935					$	562,869
Due after one year through five years						366,403						371,895
Due after five years through ten years						277,823						289,730
Due after ten years						2,617,553						2,660,080
Total AFS debt securities						$	3,823,714					$	3,884,574

As of June 30, 2020 and December 31, 2019, AFS debt securities with fair value of $745.2 million and $479.4 million, respectively, were pledged to secure public deposits, repurchase agreements and for other purposes required or permitted by law.

Restricted Equity Securities

The following table presents the restricted equity securities on the Consolidated Balance Sheet as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020						December 31, 2019
Federal Reserve Bank (“FRB”) stock						$	58,781					$	58,330
FHLB stock						20,182						20,250
Total restricted equity securities						$	78,963					$	78,580

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Note 6 — Derivatives

The Company uses derivatives to manage exposure to market risk, primarily interest rate risk and foreign currency risk, and to assist customers with their risk management objectives. The Company’s goal is to manage interest rate sensitivity and volatility so that movements in interest rates do not significantly affect earnings or capital. The Company also uses foreign exchange contracts to manage the foreign exchange rate risk associated with certain foreign currency-denominated assets and liabilities, as well as the Bank’s investment in East West Bank (China) Limited. The Company recognizes all derivatives on the Consolidated Balance Sheet at fair value. While the Company designates certain derivatives as hedging instruments in a qualifying hedge accounting relationship, other derivatives consist of economic hedges. For additional information on the Company’s derivatives and hedging activities, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Derivatives to the Consolidated Financial Statements of the Company’s 2019 Form 10-K.

The following table presents the total notional amounts and gross fair values of the Company’s derivatives, as well as the balance sheet netting adjustments on an aggregate basis as of June 30, 2020 and December 31, 2019. The derivative assets and liabilities are presented on a gross basis prior to the application of bilateral collateral and master netting agreements, but after the variation margin payments with central clearing organizations have been applied as settlement, as applicable. Total derivative assets and liabilities are adjusted to take into consideration the effects of legally enforceable master netting agreements and cash collateral received or paid as of June 30, 2020 and December 31, 2019. The resulting net derivative asset and liability fair values are included in Other assets and Accrued expenses and other liabilities, respectively, on the Consolidated Balance Sheet.

($ in thousands)						June 30, 2020																														December 31, 2019
									Notional Amount						Fair Value																		Notional Amount						Fair Value
																		Derivative Assets						Derivative Liabilities															Derivative Assets						Derivative Liabilities
Derivatives designated as hedging instruments:
Fair value hedges:
Interest rate contracts						$	15,194					$	—					$	174					$	31,026					$	—					$	3,198
Cash flow hedges:
Interest rate contracts						275,000						—						1,483						—						—						—
Net investment hedges:
Foreign exchange contracts						77,689						245						—						86,167						—						1,586
Total derivatives designated as hedging instruments						$	367,883					$	245					$	1,657					$	117,193					$	—					$	4,784
Derivatives not designated as hedging instruments:
Interest rate contracts						$	17,170,884					$	613,480					$	400,146					$	15,489,692					$	192,883					$	124,119
Foreign exchange contracts						2,738,018						24,044						19,741						4,839,661						54,637						47,024
Credit contracts						204,498						41						327						210,678						2						84
Equity contracts						—			(1)			9,173						—						—			(1)			1,414						—
Commodity contracts						—			(2)			117,447						138,298						—			(2)			81,380						80,517
Total derivatives not designated as hedging instruments						$	20,113,400					$	764,185					$	558,512					$	20,540,031					$	330,316					$	251,744
Gross derivative assets/liabilities												$	764,430					$	560,169											$	330,316					$	256,528
Less: Master netting agreements												(110,569)						(110,569)												(121,561)						(121,561)
Less: Cash collateral received/paid												(11,649)						(94,435)												(3,758)						(38,238)
Net derivative assets/liabilities												$	642,212					$	355,165											$	204,997					$	96,729

(1)The Company held equity contracts in three public companies and 17 private companies as of June 30, 2020. In comparison, the Company held equity contracts in three public companies and 18 private companies as of December 31, 2019.

(2)The notional amount of the Company’s commodity contracts entered with its customers totaled 6,155 thousand barrels of crude oil and 84,957 thousand units of natural gas, measured in million British thermal units (“MMBTUs”) as of June 30, 2020. In comparison, the notional amount of the Company’s commodity contracts entered with its customers totaled 7,811 thousand barrels of crude oil and 63,773 thousand MMBTUs of natural gas as of December 31, 2019. The Company simultaneously entered into the offsetting commodity contracts with mirrored terms with third-party financial institutions.

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Derivatives Designated as Hedging Instruments

Fair Value Hedges — The Company is exposed to changes in the fair value of certain certificates of deposit due to changes in the benchmark interest rates. The Company has entered into interest rate swaps, which were designated as fair value hedges. The interest rate swaps involve the exchange of variable rate payments over the life of the agreements without the exchange of the underlying notional amounts.

The following table presents the net gains (losses) recognized on the Consolidated Statement of Income related to the derivatives designated as fair value hedges for the three and six months ended June 30, 2020 and 2019:

($ in thousands)						Three Months Ended June 30,																		Six Months Ended June 30,
									2020						2019						2020						2019
Gains (losses) recorded in interest expense:
Recognized on interest rate swaps						$	951					$	1,634					$	2,996					$	2,854
Recognized on certificates of deposit						$	(357)					$	(1,434)					$	(1,719)					$	(2,695)

The following table presents the carrying amount and associated cumulative basis adjustment related to the application of fair value hedge accounting that is included in the carrying amount of the hedged certificates of deposit as of June 30, 2020 and December 31, 2019:

($ in thousands)						Carrying Value (1)																		Cumulative Fair     Value Adjustment (2)
									June 30, 2020						December 31, 2019						June 30, 2020						December 31, 2019
Certificates of deposit						$	(14,986)					$	(29,080)					$	(114)					$	1,604

(1)Represents the full carrying amount of the hedged certificates of deposit.

(2)For liabilities, (increase) decrease to carrying value.

Cash Flow Hedges — The Company entered into interest rate swaps that were designated and qualified as cash flow hedges in the second quarter of 2020 to hedge the variability in interest payments on certain floating rate borrowings. For cash flow hedges, the entire change in the fair value of the hedging instruments is recognized in AOCI and reclassified to earnings in the same period when the hedged cash flows impacts earnings. Reclassified gains and losses on interest rate swaps are recorded in the same line item as the interest payments of the hedged long-term borrowings within Interest expense in the Consolidated Statements of Income. As of June 30, 2020, the notional amount of the interest rate swaps that were designated as cash flow hedges was $275.0 million. Considering the interest rates, yield curve and notional amounts as of June 30, 2020, the Company expects to reclassify an estimated $183 thousand of after-tax net gains on derivative instruments designated as cash flow hedges from AOCI into earnings during the next 12 months.

The following table presents the pre-tax changes in AOCI from cash flow hedges for the three and six months ended June 30, 2020 and 2019. The after-tax impact of cash flow hedges on AOCI is shown in Note 14 — Accumulated Other Comprehensive Income (Loss) to the Consolidated Financial Statements in the Form-10-Q.

($ in thousands)						Three Months Ended June 30,																		Six Months Ended June 30,
									2020						2019						2020						2019
Gains (losses) recognized in AOCI						$	(1,483)					$	—					$	(1,483)					$	—
Gains (losses) reclassified from AOCI to Interest expense						$	377					$	—					$	377					$	—

Net Investment Hedges — ASC 830-20, Foreign Currency Matters — Foreign Currency Transactions and ASC 815, Derivatives and Hedging, allow hedging of the foreign currency risk of a net investment in a foreign operation. The Company enters into foreign currency forward contracts to hedge a portion of the Bank’s investment in East West Bank (China) Limited, a non-USD functional currency subsidiary in China. The hedging instruments designated as net investment hedges, involve hedging the risk of changes in the USD equivalent value of a designated monetary amount of the Bank’s net investment in East West Bank (China) Limited, against the risk of adverse changes in the foreign currency exchange rate of the Chinese Renminbi (“RMB”). The Company may de-designate the net investment hedges when the Company expects the hedge will cease to be highly effective. The notional and fair value amounts of the foreign exchange forward contracts were $77.7 million and $245 thousand asset, respectively, as of June 30, 2020. In comparison, the notional and fair value amounts of the foreign exchange forward contracts, were $86.2 million and $1.6 million liability, respectively, as of December 31, 2019.

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The following table presents the after-tax (losses) gains recognized in AOCI on net investment hedges for the three and six months ended June 30, 2020 and 2019:

($ in thousands)						Three Months Ended June 30,																		Six Months Ended June 30,
									2020						2019						2020						2019
Gains (losses) recognized in AOCI						$	(377)					$	(598)					$	627					$	(2,603)

Derivatives Not Designated as Hedging Instruments

Interest Rate Contracts — The Company enters into interest rate contracts, which include interest rate swaps and options with its customers to allow customers to hedge against the risk of rising interest rates on their variable rate loans. To economically hedge against the interest rate risks in the products offered to its customers, the Company enters into mirrored offsetting interest rate contracts with third-party financial institutions, including central clearing organizations. Beginning in January 2018, the London Clearing House (“LCH”) amended its rulebook to legally characterize variation margin payments made to and received from LCH as settlements of derivatives, and not as collateral against derivatives. Included in the total notional amount of $8.60 billion of interest rates contracts entered into with financial counterparties as of June 30, 2020, was a notional amount of $2.82 billion of interest rate swaps that cleared through LCH. Applying variation margin payments as settlement to LCH cleared derivative transactions resulted in a reduction in derivative liability fair values of $229.8 million, as of June 30, 2020. In comparison, included in the total notional amount of $7.75 billion of interest rates contracts entered into with financial counterparties as of December 31, 2019, was a notional amount of $2.53 billion of interest rate swaps that cleared through LCH. Applying variation margin payments as settlement to LCH cleared derivative transactions resulted in a reduction in derivative asset fair values of $2.9 million and liability fair values of $75.1 million as of December 31, 2019.

The following tables present the notional amounts and the gross fair values of interest rate derivative contracts outstanding as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020
									Customer Counterparty																														($ in thousands)						Financial Counterparty
									Notional Amount						Fair Value																											Notional Amount						Fair Value
																		Assets						Liabilities																								Assets						Liabilities
Written options						$	858,996					$	—					$	241					Purchased options						$	858,996					$	241					$	—
Sold collars and corridors						531,098						10,658						1						Collars and corridors						531,098						1						10,696
Swaps						7,179,331						601,250						—						Swaps						7,211,365						1,330						389,208
Total						$	8,569,425					$	611,908					$	242					Total						$	8,601,459					$	1,572					$	399,904

($ in thousands)						December 31, 2019
									Customer Counterparty																														($ in thousands)						Financial Counterparty
									Notional Amount						Fair Value																											Notional Amount						Fair Value
																		Assets						Liabilities																								Assets						Liabilities
Written options						$	1,003,558					$	—					$	66					Purchased options						$	1,003,558					$	67					$	—
Sold collars and corridors						490,852						1,971						16						Collars and corridors						490,852						17						1,996
Swaps						6,247,667						187,294						6,237						Swaps						6,253,205						3,534						115,804
Total						$	7,742,077					$	189,265					$	6,319					Total						$	7,747,615					$	3,618					$	117,800

Foreign Exchange Contracts — The Company enters into foreign exchange contracts with its customers, consisting of forwards, spot, swap and option contracts to accommodate the business needs of its customers. For the foreign exchange contracts entered into with its customers, the Company managed its foreign exchange exposure by entering into offsetting foreign exchange contracts with third-party financial institutions and/or entering into bilateral collateral and master netting agreements with customer counterparties to manage its credit exposure. The Company also utilizes foreign exchange contracts, which are not designated as hedging instruments to mitigate the economic effect of currency fluctuations on certain foreign currency-denominated on-balance sheet assets and liabilities, primarily for foreign currency-denominated deposits offered to its customers. A majority of the foreign exchange contracts had original maturities of one year or less as of June 30, 2020 and December 31, 2019.

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The following tables present the notional amounts and the gross fair values of foreign exchange derivative contracts outstanding as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020
									Customer Counterparty																														($ in thousands)						Financial Counterparty
									Notional Amount						Fair Value																											Notional Amount						Fair Value
																		Assets						Liabilities																								Assets						Liabilities
Forwards and spot						$	1,768,864					$	17,940					$	14,246					Forwards and spot						$	62,424					$	62					$	98
Swaps						7,160						—						42						Swaps						734,640						4,502						3,808
Collars						1,685						2						—						Collars						162,245						1,538						1,547
Total						$	1,777,709					$	17,942					$	14,288					Total						$	959,309					$	6,102					$	5,453

($ in thousands)						December 31, 2019
									Customer Counterparty																														($ in thousands)						Financial Counterparty
									Notional Amount						Fair Value																											Notional Amount						Fair Value
																		Assets						Liabilities																								Assets						Liabilities
Forwards and spot						$	3,581,036					$	45,911					$	40,591					Forwards and spot						$	207,492					$	1,400					$	507
Swaps						6,889						16						84						Swaps						702,391						6,156						4,712
Written options						87,036						127						—						Purchased options						87,036						—						127
Collars						2,244						—						14						Collars						165,537						1,027						989
Total						$	3,677,205					$	46,054					$	40,689					Total						$	1,162,456					$	8,583					$	6,335

Credit Contracts — The Company may periodically enter into RPA contracts to manage the credit exposure on interest rate contracts associated with syndicated loans and may enter into protection sold or protection purchased RPAs with institutional counterparties. Under the RPAs, the Company will receive or make a payment if a borrower defaults on the related interest rate contract. Credit risk on RPAs is managed by monitoring the credit worthiness of the borrowers and institutional counterparties, which is based on the normal credit review process. The referenced entities of the RPAs were investment grade as of both June 30, 2020 and December 31, 2019. The notional amount of the RPAs reflects the Company’s pro-rata share of the derivative instrument. The following table presents the notional amounts and the gross fair values of RPAs sold and purchased outstanding as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020																														December 31, 2019
									Notional Amount						Fair Value																		Notional Amount						Fair Value
																		Assets						Liabilities															Assets						Liabilities
RPAs - protection sold						$	193,783					$	—					$	327					$	199,964					$	—					$	84
RPAs - protection purchased						10,714						41						—						10,714						2						—
Total RPAs						$	204,497					$	41					$	327					$	210,678					$	2					$	84

Assuming all underlying borrowers referenced in the interest rate contracts defaulted as of June 30, 2020 and December 31, 2019, the exposure from the RPAs with protections sold would be $778 thousand and $125 thousand, respectively. As of June 30, 2020 and December 31, 2019, the weighted-average remaining maturities of the outstanding RPAs were 1.7 years and 2.2 years, respectively.

Equity Contracts — As part of the Company’s loan origination process, from time to time, the Company obtains warrants to purchase preferred and/or common stock of technology and life sciences companies to which it provides loans. Warrants grant the Company the right to buy a certain class of the underlying company’s equity at a certain price before expiration. The Company held warrants in three public companies and 17 private companies as of June 30, 2020, and held warrants in three public companies and 18 private companies as of December 31, 2019. The total fair value of the warrants held in both public and private companies was $9.2 million and $1.4 million in assets as of June 30, 2020 and December 31, 2019, respectively.

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Commodity Contracts — The Company enters into energy commodity contracts in the form of swaps and options with its commercial loan customers to allow them to hedge against the risk of fluctuation in energy commodity prices. To economically hedge against the risk of fluctuation in commodity prices in the products offered to its customers, the Company enters into offsetting commodity contracts with third-party financial institutions to manage the exposure with its customers. Beginning in January 2017, the Chicago Mercantile Exchange (“CME”) amended its rulebook to legally characterize variation margin payments made to and received from CME as settlements of derivatives and not as collateral against derivatives. As of June 30, 2020, the notional quantities that cleared through CME totaled 1,532 thousand barrels of crude oil and 24,895 thousand MMBTUs of natural gas. Applying the variation margin payments as settlement to CME-cleared derivative transactions resulted in reductions in gross derivative asset fair value of $25.0 million and liability fair value of $631 thousand, respectively, as of June 30, 2020, for a net asset fair value of $2.3 million. In comparison, the notional quantities that cleared through CME totaled 1,752 thousand barrels of crude oil and 6,075 thousand MMBTUs of natural gas as of December 31, 2019. Applying the variation margin payments as settlement to CME-cleared derivative transactions resulted in a reduction in gross derivative asset fair value of $2.9 million and liability fair value of $1.5 million, respectively, as of December 31, 2019, for a net asset fair value of $986 thousand.

The following tables present the notional amounts and fair values of the commodity derivative positions outstanding as of June 30, 2020 and December 31, 2019:

($ and units in thousands)						June 30, 2020
									Customer Counterparty																																										($ and units in thousands)						Financial Counterparty
									Notional Unit																		Fair Value																											Notional Unit																		Fair Value
																														Assets						Liabilities																																				Assets						Liabilities
Crude oil:																														Crude oil:
Written options						—						Barrels						$	—					$	70					Purchased options						—						Barrels						$	70					$	—
Collars						1,966						Barrels						63						20,463						Collars						2,218						Barrels						21,847						1,607
Swaps						4,189						Barrels						1,273						51,320						Swaps						4,261						Barrels						32,875						1,779
Total						6,155												$	1,336					$	71,853					Total						6,479												$	54,792					$	3,386
Natural gas:																														Natural gas:
Written options						1,033						MMBTUs						$	—					$	172					Purchased Options						1,023						MMBTUs						$	157					$	—
Collars						13,066						MMBTUs						881						955						Collars						13,186						MMBTUs						883						881
Swaps						70,858						MMBTUs						29,550						31,988						Swaps						78,528						MMBTUs						29,848						29,063
Total						84,957												$	30,431					$	33,115					Total						92,737												$	30,888					$	29,944
Total																		$	31,767					$	104,968					Total																		$	85,680					$	33,330

($ and units in thousands)						December 31, 2019
									Customer Counterparty																																										($ and units in thousands)						Financial Counterparty
									Notional Unit																		Fair Value																											Notional Unit																		Fair Value
																														Assets						Liabilities																																				Assets						Liabilities
Crude oil:																														Crude oil:
Written options						36						Barrels						$	—					$	30					Purchased options						36						Barrels						$	29					$	—
Collars						3,174						Barrels						2,673						538						Collars						3,630						Barrels						677						2,815
Swaps						4,601						Barrels						6,949						5,531						Swaps						4,721						Barrels						4,516						5,215
Total						7,811												$	9,622					$	6,099					Total						8,387												$	5,222					$	8,030
Natural gas:																														Natural gas:
Written options						540						MMBTUs						$	—					$	22					Purchased options						530						MMBTUs						$	21					$	—
Collars						14,277						MMBTUs						186						522						Collars						14,517						MMBTUs						471						150
Swaps						48,956						MMBTUs						30,257						35,497						Swaps						48,779						MMBTUs						35,601						30,197
Total						63,773												$	30,443					$	36,041					Total						63,826												$	36,093					$	30,347
Total																		$	40,065					$	42,140					Total																		$	41,315					$	38,377

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The following table presents the net (losses) gains recognized on the Company’s Consolidated Statement of Income related to derivatives not designated as hedging instruments for the three and six months ended June 30, 2020 and 2019:

($ in thousands)						Classification on Consolidated Statement of Income						Three Months Ended June 30,																		Six Months Ended June 30,
																		2020						2019						2020						2019
Derivatives not designated as hedging instruments:
Interest rate contracts						Interest rate contracts and other derivative income						$	(5,361)					$	(1,359)					$	(12,372)					$	(3,138)
Foreign exchange contracts						Foreign exchange income						6,201						3,495						9,062						9,821
Credit contracts						Interest rate contracts and other derivative income						(75)						(36)						(98)						47
Equity contracts						Lending fees						8,070						917						8,379						1,167
Commodity contracts						Interest rate contracts and other derivative income						(71)						(22)						(47)						(18)
Net gains												$	8,764					$	2,995					$	4,924					$	7,879

Credit Risk-Related Contingent Features — Certain over-the-counter derivative contracts of the Company contain early termination provisions that may require the Company to settle any outstanding balances upon the occurrence of a specified credit risk-related event. These events, which are defined by the existing derivative contracts, primarily relate to a downgrade in the credit rating of East West Bank to below investment grade. As of June 30, 2020, the aggregate fair value amounts of all derivative instruments with credit risk-related contingent features that are in a net liability position totaled $136.6 million, in which $136.5 million in cash and securities collateral were posted to cover these positions. As of December 31, 2019, the aggregate fair value amounts of all derivative instruments with credit risk-related contingent features that are in a net liability position totaled $56.4 million, which includes $14.4 million in derivative assets and $70.8 million in derivative liabilities. The Company posted $56.4 million in cash and securities collateral to cover these positions as of December 31, 2019. In the event that the credit rating of East West Bank had been downgraded to below investment grade, additional minimal collateral would have been required to be posted as of June 30, 2020, and December 31, 2019.

Offsetting of Derivatives

The following tables present the gross derivative fair values, the balance sheet netting adjustments and the resulting net fair values recorded on the consolidated balance sheet, as well as the cash and noncash collateral associated with master netting arrangements. The gross amounts of derivative assets and liabilities are presented after the application of variation margin payments as settlements with centrally cleared organizations, where applicable. The collateral amounts in the following tables are limited to the outstanding balances of the related asset or liability, after the application of netting; therefore instances of overcollateralization are not shown:

($ in thousands)						As of June 30, 2020
						Gross Amounts Recognized (1)						Gross Amounts Offset on the Consolidated Balance Sheet																		Net Amounts Presented on the Consolidated Balance Sheet						Gross Amounts Not Offset on the Consolidated Balance Sheet						Net Amount
																		Master Netting Arrangements						Cash Collateral Received (3)															Security Collateral Received (5)
Derivative assets						$	764,430					$	(110,569)					$	(11,649)					$	642,212					$	(13,447)					$	628,765
						Gross Amounts Recognized (2)						Gross Amounts Offset on the Consolidated Balance Sheet																		Net Amounts Presented on the Consolidated Balance Sheet						Gross Amounts Not Offset on the Consolidated Balance Sheet						Net Amount
																		Master Netting Arrangements						Cash Collateral Pledged (4)															Security Collateral Pledged (5)
Derivative liabilities						$	560,169					$	(110,569)					$	(94,435)					$	355,165					$	(279,528)					$	75,637

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($ in thousands)						As of December 31, 2019
						Gross Amounts Recognized (1)						Gross Amounts Offset on the Consolidated Balance Sheet																		Net Amounts Presented on the Consolidated Balance Sheet						Gross Amounts Not Offset on the Consolidated Balance Sheet						Net Amount
																		Master Netting Arrangements						Cash Collateral Received (3)															Security Collateral Received (5)
Derivative assets						$	330,316					$	(121,561)					$	(3,758)					$	204,997					$	—					$	204,997
						Gross Amounts Recognized (2)						Gross Amounts Offset on the Consolidated Balance Sheet																		Net Amounts Presented on the Consolidated Balance Sheet						Gross Amounts Not Offset on the Consolidated Balance Sheet						Net Amount
																		Master Netting Arrangements						Cash Collateral Pledged (4)															Security Collateral Pledged (5)
Derivative liabilities						$	256,528					$	(121,561)					$	(38,238)					$	96,729					$	(79,619)					$	17,110

(1)Gross amounts recognized for derivative assets include amounts with counterparties subject to enforceable master netting arrangements or similar agreements of $754.7 million and $328.7 million, respectively, as of June 30, 2020 and December 31, 2019, and amounts with counterparties not subject to enforceable master netting arrangements or similar agreements of $9.7 million and $1.6 million, respectively, as of June 30, 2020 and December 31, 2019.

(2)Gross amounts recognized for derivative liabilities include amounts with counterparties subject to enforceable master netting arrangements or similar agreements of $560.0 million and $256.5 million, respectively, as of June 30, 2020 and December 31, 2019, and amounts with counterparties not subject to enforceable master netting arrangements or similar agreements of $211 thousand and $20 thousand, respectively, as of June 30, 2020 and December 31, 2019.

(3)Gross cash collateral received under master netting arrangements or similar agreements were $18.1 million and $3.8 million, respectively, as of June 30, 2020 and December 31, 2019. Of the gross cash collateral received, $11.6 million and $3.8 million were used to offset against derivative assets, respectively, as of June 30, 2020 and December 31, 2019.

(4)Gross cash collateral pledged under master netting arrangements or similar agreements were $98.9 million and $43.0 million, respectively, as of June 30, 2020 and December 31, 2019. Of the gross cash collateral pledged, $94.4 million and $38.2 million were used to offset against derivative liabilities, respectively, as of June 30, 2020 and December 31, 2019.

(5)Represents the fair value of security collateral received and pledged limited to derivative assets and liabilities that are subject to enforceable master netting arrangements or similar agreements. GAAP does not permit the netting of noncash collateral on the consolidated balance sheet but requires disclosure of such amounts.

In addition to the amounts included in the tables above, the Company also has balance sheet netting related to the resale and repurchase agreements. Refer to Note 4 — Securities Purchased under Resale Agreements and Sold under Repurchase Agreements to the Consolidated Financial Statements for additional information. Refer to Note 3 — Fair Value Measurement and Fair Value of Financial Instruments to the Consolidated Financial Statements in this Form 10-Q for fair value measurement disclosures on derivatives.

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Note 7 — Loans Receivable and Allowance for Credit Losses

The following table presents the composition of the Company’s loans held-for-investment as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020						December 31, 2019
									Amortized Cost (1)						Non-PCI Loans (1)						PCI Loans						Total (1)
Commercial:
C&I						$	13,422,691					$	12,149,121					$	1,810					$	12,150,931
CRE:
CRE						10,902,114						10,165,247						113,201						10,278,448
Multifamily residential						3,032,385						2,834,212						22,162						2,856,374
Construction and land						567,716						628,459						40						628,499
Total CRE						14,502,215						13,627,918						135,403						13,763,321
Total commercial						27,924,906						25,777,039						137,213						25,914,252
Consumer:
Residential mortgage:
Single-family residential						7,660,094						7,028,979						79,611						7,108,590
HELOCs						1,461,951						1,466,736						6,047						1,472,783
Total residential mortgage						9,122,045						8,495,715						85,658						8,581,373
Other consumer						182,461						282,914						—						282,914
Total consumer						9,304,506						8,778,629						85,658						8,864,287
Total loans held-for-investment						$	37,229,412					$	34,555,668					$	222,871					$	34,778,539
Allowance for loan losses						(632,071)						(358,287)						—						(358,287)
Loans held-for-investment, net						$	36,597,341					$	34,197,381					$	222,871					$	34,420,252

(1)Includes net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts of $(72.1) million and $(43.2) million as of June 30, 2020 and December 31, 2019, respectively.

Loans held-for-investments’ accrued interest receivable was $111.8 million and $121.8 million as of June 30, 2020 and December 31, 2019, respectively. Interest income related to nonaccrual loans of approximately $1.2 million and $1.6 million were reversed during the three and six months ended June 30, 2020, respectively. Interest income of approximately $10 thousand and $12 thousand were recognized on nonaccrual loans for the three and six months ended June 30, 2020, respectively. For the accounting policy on accrued interest receivable related to loans held-for-investment, see Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Form 10-Q.

Loans totaling $27.41 billion and $22.43 billion as of June 30, 2020 and December 31, 2019, respectively, were pledged to secure borrowings and provide additional borrowing capacity from the FRB and the FHLB.

Credit Quality Indicators

All loans are subject to the Company’s credit review and monitoring. For the commercial portfolio, loans are risk rated based on an analysis of the borrower’s current payment performance or delinquency, repayment sources, financial and liquidity factors, including industry and geographic considerations. For the majority of the consumer portfolio, payment performance or delinquency is the driving indicator for the risk ratings.

For the Company’s internal credit risk ratings, each individual loan is given a risk rating of 1 through 10. Loans risk rated 1 through 5 are assigned an internal risk rating of “Pass”, with loans risk rated 1 being fully secured by cash or U.S. government securities. Pass loans have sufficient sources of repayment to repay the loan in full, in accordance with all terms and conditions. Loans assigned a risk rating of 6 have potential weaknesses that warrant closer attention by management; these are assigned an internal risk rating of “Special Mention”. Loans assigned a risk rating of 7 or 8 have well-defined weaknesses that may jeopardize the full and timely repayment of the loan; these are assigned an internal risk rating of “Substandard”. Loans assigned a risk rating of 9 have insufficient sources of repayment and a high probability of loss; these are assigned an internal risk rating of “Doubtful”. Loans assigned a risk rating of 10 are uncollectable and of such little value that they are no longer considered bankable assets; these are assigned an internal risk rating of “Loss”. The Company reviews the internal risk ratings for its loan portfolio on a regular and ongoing basis and make adjustments to the risk ratings based on changes in the borrowers’ financial status and the collectability of the loans.

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The following table summarizes the Company’s loans held-for-investment as of June 30, 2020, presented by loan portfolio segments, internal risk ratings and vintage year. The vintage year is the year of origination, renewal or major modification.

($ in thousands)						June 30, 2020
																																													Revolving Loans Amortized Cost Basis						Revolving Loans Converted to Term Loans Amortized Cost Basis
									Term Loans																																																																																				Total
									Amortized Cost Basis by Origination Year
									2020						2019						2018						2017						2016						Prior
Commercial:
C&I:
Pass						$	2,922,977					$	2,010,048					$	818,374					$	328,471					$	85,000					$	380,727					$	6,007,247					$	9,830					$	12,562,674
Special mention						525						80,449						54,144						22,757						150						6,105						251,461						—						415,591
Substandard						8,102						82,574						52,383						7,979						6,313						2,515						283,335						—						443,201
Doubtful						—						—						—						—						964						261						—						—						1,225
Total C&I						2,931,604						2,173,071						924,901						359,207						92,427						389,608						6,542,043						9,830						13,422,691
CRE:
Pass						1,249,819						2,859,844						2,410,797						1,380,086						794,228						1,722,081						170,556						10,716						10,598,127
Special mention						13,072						—						49,860						22,468						1,611						45,309						—						—						132,320
Substandard						8,303						51,944						7,711						43,914						17,213						42,582						—						—						171,667
Total CRE						1,271,194						2,911,788						2,468,368						1,446,468						813,052						1,809,972						170,556						10,716						10,902,114
Multifamily residential:
Pass						489,855						1,045,053						507,413						414,771						181,265						357,680						5,809						—						3,001,846
Special mention						—						20,433						—						—						262						1,228						—						—						21,923
Substandard						—						744						2,150						—						—						5,722						—						—						8,616
Total multifamily residential						489,855						1,066,230						509,563						414,771						181,527						364,630						5,809						—						3,032,385
Construction and land:
Pass						46,378						283,670						185,570						5,982						21,636						1,170						—						—						544,406
Substandard						3,618						—						—						—						—						19,692						—						—						23,310
Total construction and land						49,996						283,670						185,570						5,982						21,636						20,862						—						—						567,716
Total CRE						1,811,045						4,261,688						3,163,501						1,867,221						1,016,215						2,195,464						176,365						10,716						14,502,215
Total commercial						4,742,649						6,434,759						4,088,402						2,226,428						1,108,642						2,585,072						6,718,408						20,546						27,924,906
Consumer:
Single-family residential:
Pass						1,150,786						1,987,025						1,694,022						1,162,434						593,501						1,047,965						—						—						7,635,733
Special mention						—						637						1,601						836						305						1,834						—						—						5,213
Substandard						—						1,393						3,256						3,382						1,349						9,768						—						—						19,148
Total single-family residential mortgage						1,150,786						1,989,055						1,698,879						1,166,652						595,155						1,059,567						—						—						7,660,094
HELOCs:
Pass						185						836						4,417						7,949						7,511						18,097						1,239,458						168,658						1,447,111
Special mention						—						—						200						—						—						380						2						190						772
Substandard						—						151						788						4,632						1,308						4,038						—						3,151						14,068
Total HELOCs						185						987						5,405						12,581						8,819						22,515						1,239,460						171,999						1,461,951
Total residential mortgage						1,150,971						1,990,042						1,704,284						1,179,233						603,974						1,082,082						1,239,460						171,999						9,122,045
Other consumer:
Pass						3,236						4,272						3,358						1,838						—						131,825						35,372						—						179,901
Special mention						51						—						—						—						—						—						—						—						51
Substandard						2						—						—						2,491						—						3						13						—						2,509
Total other consumer						3,289						4,272						3,358						4,329						—						131,828						35,385						—						182,461
Total consumer						1,154,260						1,994,314						1,707,642						1,183,562						603,974						1,213,910						1,274,845						171,999						9,304,506
Total						$	5,896,909					$	8,429,073					$	5,796,044					$	3,409,990					$	1,712,616					$	3,798,982					$	7,993,253					$	192,545					$	37,229,412

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Revolving loans that are converted to term loans presented in the table above are excluded from the term loans by vintage year columns. HELOCS totaling $12.1 million and $43.4 million converted to term loans during the three and six months ended June 30, 2020, respectively. There were no conversions of C&I or CRE revolving loans to term loans during the three and six months ended June 30, 2020.

The following tables present the credit risk ratings for non-PCI and PCI loans by portfolio segments as of December 31, 2019:

($ in thousands)						December 31, 2019
									Pass						Special Mention						Substandard						Doubtful												Total Non-PCI Loans
Commercial:
C&I						$	11,423,094					$	406,543					$	302,509					$	16,975											$	12,149,121
CRE:
CRE						10,003,749						83,683						77,815						—												10,165,247
Multifamily residential						2,806,475						20,406						7,331						—												2,834,212
Construction and land						603,447						—						25,012						—												628,459
Total CRE						13,413,671						104,089						110,158						—												13,627,918
Total commercial						24,836,765						510,632						412,667						16,975												25,777,039
Consumer:
Residential mortgage:
Single-family residential						7,012,522						2,278						14,179						—												7,028,979
HELOCs						1,453,207						2,787						10,742						—												1,466,736
Total residential mortgage						8,465,729						5,065						24,921						—												8,495,715
Other consumer						280,392						5						2,517						—												282,914
Total consumer						8,746,121						5,070						27,438						—												8,778,629
Total						$	33,582,886					$	515,702					$	440,105					$	16,975											$	34,555,668

($ in thousands)						December 31, 2019
									Pass						Special Mention						Substandard						Doubtful												Total PCI Loans
Commercial:
C&I						$	1,810					$	—					$	—					$	—											$	1,810
CRE:
CRE						102,257						—						10,944						—												113,201
Multifamily residential						22,162						—						—						—												22,162
Construction and land						40						—						—						—												40
Total CRE						124,459						—						10,944						—												135,403
Total commercial						126,269						—						10,944						—												137,213
Consumer:
Residential mortgage:
Single-family residential						79,517						—						94						—												79,611
HELOCs						5,849						—						198						—												6,047
Total residential mortgage						85,366						—						292						—												85,658
Total consumer						85,366						—						292						—												85,658
Total (1)						$	211,635					$	—					$	11,236					$	—											$	222,871

(1)Loans net of ASC 310-10 discount.

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Nonaccrual and Past Due Loans

Loans that are 90 or more days past due are generally placed on nonaccrual status, unless the loan is well-collateralized or guaranteed by government agencies, and in the process of collection. Loans that are less than 90 days past due but have identified deficiencies, such as when the full collection of principal or interest becomes uncertain, are also placed on nonaccrual status. The following table presents the aging analysis of total loans held-for-investment as of June 30, 2020:

($ in thousands)						June 30, 2020
									Current Accruing Loans						Accruing Loans 30-59  Days Past Due						Accruing Loans 60-89  Days Past Due																		Total Accruing Past Due Loans						Nonaccrual Loans Less Than 90  Days Past Due						Nonaccrual Loans 90 or More Days  Past Due						Total Nonaccrual Loans						Total Loans
Commercial:
C&I						$	13,277,732					$	46,774					$	13,362																	$	60,136					$	54,555					$	30,268					$	84,823					$	13,422,691
CRE:
CRE						10,836,810						7,452						1,275																		8,727						1,210						55,367						56,577						10,902,114
Multifamily residential						3,025,648						3,655						2,308																		5,963						774						—						774						3,032,385
Construction and land						567,716						—						—																		—						—						—						—						567,716
Total CRE						14,430,174						11,107						3,583																		14,690						1,984						55,367						57,351						14,502,215
Total commercial						27,707,906						57,881						16,945																		74,826						56,539						85,635						142,174						27,924,906
Consumer:
Residential mortgage:
Single-family residential						7,619,333						15,739						4,952																		20,691						1,713						18,357						20,070						7,660,094
HELOCs						1,444,945						2,165						773																		2,938						443						13,625						14,068						1,461,951
Total residential mortgage						9,064,278						17,904						5,725																		23,629						2,156						31,982						34,138						9,122,045
Other consumer						165,258						14,636						59																		14,695						—						2,508						2,508						182,461
Total consumer						9,229,536						32,540						5,784																		38,324						2,156						34,490						36,646						9,304,506
Total						$	36,937,442					$	90,421					$	22,729																	$	113,150					$	58,695					$	120,125					$	178,820					$	37,229,412

The following table presents amortized cost of loans on nonaccrual status for which there was no related allowance for loan losses as of June 30, 2020:

($ in thousands)						June 30, 2020
Commercial:
C&I						$	66,109
CRE:
CRE						54,879
Total CRE						54,879
Total commercial						120,988
Consumer:
Residential mortgage:
Single-family residential						8,642
HELOCs						8,898
Total residential mortgage						17,540
Other consumer						2,491
Total consumer						20,031
Total nonaccrual loans with no related allowance for loan losses						$	141,019

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The following table presents the aging analysis of non-PCI loans as of December 31, 2019:

($ in thousands)						December 31, 2019
									Current Accruing Loans						Accruing Loans 30-59 Days Past Due						Accruing Loans 60-89 Days Past Due												Total Accruing Past Due Loans						Nonaccrual Loans Less Than 90  Days Past Due						Nonaccrual Loans 90 or More Days  Past Due						Total Nonaccrual Loans						Total Non-PCI Loans
Commercial:
C&I						$	12,026,131					$	31,121					$	17,034											$	48,155					$	31,084					$	43,751					$	74,835					$	12,149,121
CRE:
CRE						10,123,999						22,830						1,977												24,807						540						15,901						16,441						10,165,247
Multifamily residential						2,832,664						198						531												729						534						285						819						2,834,212
Construction and land						628,459						—						—												—						—						—						—						628,459
Total CRE						13,585,122						23,028						2,508												25,536						1,074						16,186						17,260						13,627,918
Total commercial						25,611,253						54,149						19,542												73,691						32,158						59,937						92,095						25,777,039
Consumer:
Residential mortgage:
Single-family residential						6,993,597						15,443						5,074												20,517						1,964						12,901						14,865						7,028,979
HELOCs						1,448,930						4,273						2,791												7,064						1,448						9,294						10,742						1,466,736
Total residential mortgage						8,442,527						19,716						7,865												27,581						3,412						22,195						25,607						8,495,715
Other consumer						280,386						6						5												11						—						2,517						2,517						282,914
Total consumer						8,722,913						19,722						7,870												27,592						3,412						24,712						28,124						8,778,629
Total						$	34,334,166					$	73,871					$	27,412											$	101,283					$	35,570					$	84,649					$	120,219					$	34,555,668

PCI loans were excluded from the above aging analysis table as of December 31, 2019, as the Company elected to account for these loans on a pool level basis under ASC 310-30 at the time of acquisition. As of December 31, 2019, PCI loans on nonaccrual status totaled $297 thousand.

Foreclosed Assets

The Company had $23.4 million in foreclosed assets as of June 30, 2020 compared with $1.3 million as of December 31, 2019. The Company commences the foreclosure process on consumer mortgage loans when a borrower becomes 120 days delinquent in accordance with the Consumer Finance Protection Bureau guidelines. The carrying value of consumer real estate loans that were in the process of active or suspended foreclosure was $6.3 million and $7.2 million as of June 30, 2020 and December 31, 2019, respectively. The foreclosure proceedings for these consumer real estate loans were initiated prior to the CARES Act passed by Congress in March 2020. The Company has suspended certain mortgage foreclosure activities in connection with our actions to support our customers during the COVID-19 pandemic.

Troubled Debt Restructurings

TDRs are individually evaluated and the type of restructuring is selected based on the loan type and the circumstances of the borrower’s financial difficulty. A TDR is a modification of the terms of a loan when the Company, for economic or legal reasons related to the borrower’s financial difficulties, grants a concession to the borrower that it would not have otherwise considered. The Company has implemented various consumer and commercial loan modification programs to provide its borrowers relief from the economic impacts of COVID-19 that are not considered TDRs. For additional details related to COVID-19 loan modifications, see Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies — Summary of Significant Accounting Policies — Troubled Debt Restructurings to the Consolidated Financial Statements.

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The following tables present the additions to TDRs for the three and six months ended June 30, 2020 and 2019:

($ in thousands)						Loans Modified as TDRs During the Three Months Ended June 30,
									2020																																										2019
									Number of Loans						Pre- Modification Outstanding Recorded Investment						Post- Modification Outstanding Recorded    Investment (1)						Financial Impact (2)						Number of Loans						Pre- Modification Outstanding Recorded Investment						Post- Modification Outstanding Recorded    Investment (1)						Financial    Impact (2)
Commercial:
C&I						3						$	35,260					$	28,926					$	872					6						$	48,099					$	48,054					$	5,869
Total commercial						3						35,260						28,926						872						6						48,099						48,054						5,869
Consumer:
Residential mortgage:
Single-family residential						—						—						—						—						1						220						219						—
Total residential mortgage						—						—						—						—						1						220						219						—
Total consumer						—						—						—						—						1						220						219						—
Total						3						$	35,260					$	28,926					$	872					7						$	48,319					$	48,273					$	5,869

($ in thousands)						Loans Modified as TDRs During the Six Months Ended June 30,
									2020																																										2019
									Number of Loans						Pre- Modification Outstanding Recorded Investment						Post- Modification Outstanding Recorded    Investment (1)						Financial    Impact (2)						Number of Loans						Pre- Modification Outstanding Recorded Investment						Post- Modification Outstanding Recorded    Investment (1)						Financial    Impact (2)
Commercial:
C&I						6						$	51,708					$	43,833					$	1,000					9						$	77,250					$	77,486					$	5,929
Total commercial						6						51,708						43,833						1,000						9						77,250						77,486						5,929
Consumer:
Residential mortgage:
Single-family residential						—						—						—						—						1						220						219						—
Total residential mortgage						—						—						—						—						1						220						219						—
Total consumer						—						—						—						—						1						220						219						—
Total						6						$	51,708					$	43,833					$	1,000					10						$	77,470					$	77,705					$	5,929

(1)Includes subsequent payments after modification and reflects the balance as of June 30, 2020 and 2019.

(2)The financial impact includes charge-offs and specific reserves recorded since the modification date.

The following tables present the TDR post-modification outstanding balances for the three and six months ended June 30, 2020 and 2019 by modification type:

($ in thousands)						Modification Type During the Three Months Ended June 30,
									2020																																										2019
									Principal (1)												Interest Deferments												Total						Principal (1)						Other (2)																		Total
Commercial:
C&I						$	11,766											$	17,160											$	28,926					$	9,909					$	38,145																	$	48,054
Total commercial						11,766												17,160												28,926						9,909						38,145																		48,054
Consumer:
Residential mortgage:
Single-family residential						—												—												—						—						219																		219
Total residential mortgage						—												—												—						—						219																		219
Total consumer						—												—												—						—						219																		219
Total						$	11,766											$	17,160											$	28,926					$	9,909					$	38,364																	$	48,273

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($ in thousands)						Modification Type During the Six Months Ended June 30,
									2020																																										2019
									Principal (1)						Principal   and Interest (3)						Interest Deferments						Total						Principal (1)						Other (2)						Total
Commercial:
C&I						$	15,898					$	10,775					$	17,160					$	43,833					$	39,341					$	38,145					$	77,486
Total commercial						15,898						10,775						17,160						43,833						39,341						38,145						77,486
Consumer:
Residential mortgage:
Single-family residential						—						—						—						—						—						219						219
Total residential mortgage						—						—						—						—						—						219						219
Total consumer						—						—						—						—						—						219						219
Total						$	15,898					$	10,775					$	17,160					$	43,833					$	39,341					$	38,364					$	77,705

(1)Includes forbearance payments, term extensions and principal deferments that modify the terms of the loan from principal and interest payments to interest payments only.

(2)Includes funding to secure additional collateral and provides liquidity to collateral-dependent C&I loans.

(3)Includes principal and interest deferments or reductions.

Subsequent to restructuring, if a TDR that becomes delinquent, generally beyond 90 days past due, it is considered to be in default. TDRs are individually evaluated for impairment. Subsequent defaults do not generally have a significant additional impact on the allowance for loan losses. The following tables present information on loans for which a subsequent payment default occurred during the three and six months ended June 30, 2020 and 2019, respectively, which had been modified as TDR within the previous 12 months of its default, and were still in default as of June 30, 2020 and 2019:

($ in thousands)						Loans Modified as TDRs that Subsequently Defaulted During the Three Months Ended June 30,
									2020																		2019
									Number of Loans						Recorded Investment						Number of Loans						Recorded Investment
Commercial:
C&I						1						$	17,160					$	1					$	1,484
Total commercial						1						17,160						1						1,484
Total						1						$	17,160					$	1					$	1,484

($ in thousands)						Loans Modified as TDRs that Subsequently Defaulted During the Six Months Ended June 30,
									2020																		2019
									Number of Loans						Recorded Investment						Number of Loans						Recorded Investment
Commercial:
C&I						1						$	17,160					$	1					$	1,484
Total commercial						1						17,160						1						1,484
Total						1						$	17,160					$	1					$	1,484

The amount of additional funds committed to lend to borrowers whose terms have been modified as TDRs was $4.5 million and $2.2 million as of June 30, 2020 and December 31, 2019, respectively.

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Impaired Loans

In connection with the adoption of ASU 2016-13 on January 1, 2020, the Company no longer provides information on impaired loans. The Company had retained impaired loans information for the period ended December 31, 2019. The following table presents information on non-PCI impaired loans as of December 31, 2019:

($ in thousands)						December 31, 2019
									Unpaid Principal Balance						Recorded Investment With No Allowance						Recorded Investment With Allowance						Total Recorded Investment						Related Allowance
Commercial:
C&I						$	174,656					$	73,956					$	40,086					$	114,042					$	2,881
CRE:
CRE						27,601						20,098						1,520						21,618						97
Multifamily residential						4,965						1,371						3,093						4,464						55
Construction and land						19,696						19,691						—						19,691						—
Total CRE						52,262						41,160						4,613						45,773						152
Total commercial						226,918						115,116						44,699						159,815						3,033
Consumer:
Residential mortgage:
Single-family residential						23,626						8,507						13,704						22,211						35
HELOCs						13,711						6,125						7,449						13,574						8
Total residential mortgage						37,337						14,632						21,153						35,785						43
Other consumer						2,517						—						2,517						2,517						2,517
Total consumer						39,854						14,632						23,670						38,302						2,560
Total non-PCI impaired loans						$	266,772					$	129,748					$	68,369					$	198,117					$	5,593

The following table presents the average recorded investment and interest income recognized on non-PCI impaired loans for the three and six months ended June 30, 2019:

($ in thousands)																														Three Months Ended June 30, 2019																		Six Months Ended June 30, 2019
																																	Average Recorded Investment						Recognized Interest    Income (1)						Average Recorded Investment						Recognized Interest    Income (1)
Commercial:
C&I																														$	182,689					$	1,081					$	189,553					$	1,816
CRE:
CRE																														29,241						135						31,456						249
Multifamily residential																														5,852						61						5,883						121
Total CRE																														35,093						196						37,339						370
Total commercial																														217,782						1,277						226,892						2,186
Consumer:
Residential mortgage:
Single-family residential																														23,247						129						24,865						258
HELOCs																														13,564						38						15,321						56
Total residential mortgage																														36,811						167						40,186						314
Other consumer																														2,515						—						2,526						—
Total consumer																														39,326						167						42,712						314
Total non-PCI impaired loans																														$	257,108					$	1,444					$	269,604					$	2,500

(1)Includes interest income recognized on accruing non-PCI TDRs. Interest payments received on nonaccrual non-PCI loans are reflected as a reduction to principal, not as interest income.

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Allowance for Loan Losses

On January 1, 2020, the Company adopted ASU 2016-13 that establishes a single allowance framework for all financial assets measured at amortized cost and certain off-balance sheet credit exposures. It requires the measurement of the allowance for loan losses to be based on management’s best estimate of lifetime expected credit losses inherent in the Company’s relevant financial assets. Balance sheet information and results for reporting periods beginning with January 1, 2020 are presented under ASC 326, while prior period comparisons continue to be presented under legacy GAAP.

The process of the allowance for loan losses involves procedures to consider the unique risk characteristics of the portfolio segments. For each loan portfolio segment, the expected credit losses are estimated collectively for groups of loans with similar risk characteristics. For loans that do not share similar risk characteristics, the expected credit losses are estimated individually, which includes impaired loans.

Allowance for Collectively Evaluated Loans

Quantitative Component — The allowance for loan losses is estimated using quantitative methods that consider a variety of factors such as historical loss experience, the current credit quality of the portfolio as well as an economic outlook over the life of the loan. The Company incorporates forward-looking information through the use of macroeconomic scenarios applied over the forecasted life of the loans. These macroeconomic scenarios include variables that are considered key drivers of increases and decreases in credit losses. The Company utilizes a probability-weighted multiple scenario forecast approach. These scenarios may consist of a base forecast representing management's view of the most likely outcome, combined with and downside and upside scenarios reflecting possible worsening or improving economic conditions, respectively. A weighted average of these macroeconomic scenarios over a reasonable and supportable forecast period is incorporated into the quantitative models. If the loan’s life extends beyond the reasonable and supportable forecast period, then historical experience is considered over the remaining life of the loans in the allowance for loan losses.

Qualitative Component — The Company also considers the following qualitative factors in the determination of collectively evaluated allowance if they have not already been captured by the quantitative model. Such qualitative factors may include, but not limited to:

•Loan growth trends.

•The volume and severity of past due financial assets and the volume and severity of adversely classified or rated financial assets.

•The Company’s lending policies and procedures, including changes in lending strategies, underwriting standards, collection, write-off and recovery practices, as well as knowledge of the borrower’s operations or the borrower’s standing in the community.

•The quality of the Company’s credit review system.

•The experience, ability and depth of the Company’s management, lending staff and relevant staff.

•The effect of other external factors such as the regulatory, legal and technological environments.

•Actual and expected changes in international, national, regional, and local economic and business conditions and developments in which the Company operates, including the actual and expected condition of various market segments.

The following table provides key credit risk characteristics and macroeconomic variables that the Company uses to estimate the expected credit losses by portfolio segments and methodologies:

Portfolio Segment

Risk Characteristics

Macroeconomic Variables

C&I

Internal risk rating, size and credit spread at origination and time to maturity

Unemployment rate and two and ten year treasury spread

CRE, Multifamily residential, and Construction and land

Delinquency status, maturity date, collateral value, property type and geographic location

Unemployment rate, GDP and U.S. Treasury rates

Single-family residential and HELOCs

FICO, delinquency status, maturity date, collateral value and geographic location

Unemployment rate, GDP and home price index

Other consumer

Historical loss experience

Immaterial (1)

(1)Macroeconomic variables were measured in the qualitative estimate.

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In light of the recessionary economic conditions and forecasts during the quarter, management updated its macroeconomic forecast used in the credit loss estimation process to reflect the sudden sharp and continued recession caused by the COVID-19 global pandemic, U.S. monetary and fiscal responses to the outbreak, oil price declines and other assumptions. The macroeconomic forecast used in the credit loss estimation for the quarter ended June 30, 2020 was more adverse compared to the prior quarter, as expectations for the unemployment rate and real GDP growth deteriorated and a slower recovery was expected. For the three and six months ended June 30, 2020, there were no changes to the reasonable and supportable forecast period, and reversion to historical loss experience method.

Allowance for Loan Losses for the Commercial Loan Portfolio — The Company’s C&I lifetime loss rate model estimates credit losses by estimating a loss rate expected over the life of a loan. This loss rate is applied to the amortized cost basis, excluding accrued interest receivables, to determine expected credit losses. The lifetime loss rate model’s reasonable and supportable period spans eight quarters, thereafter immediately reverting to the historical average loss rate, expressed implicitly through the loan-level lifetime loss rate.

The Company’s CRE probability of default (“PD”)/loss given default (“LGD”) models estimate the probability that a loan will default and, in the event of default, estimate the expected credit losses upon default. The product of the PD/LGD determines the Company’s CECL. The PD/LGD model assumptions and variable inputs span the entire contractual life of the loans, adjusted for expected prepayments. After a reasonable and supportable period, the forecast of future economic conditions reverts to long-run historical economic trends. The loan-specific variables apply over the lifetime of a loan.

In order to estimate the life of a loan under both models, the contractual term of the loan is adjusted for estimated prepayments, which are based on historical prepayment experience.

Allowance for Loan Losses for the Consumer Loan Portfolio — For single-family residential and HELOC loans, PD/LGD model assumptions and variable inputs span the entire contractual life of the loans, adjusted for expected prepayments. After a reasonable and supportable period, the forecast of future economic conditions reverts to long-run historical economic trends. The loan-specific variables apply over the lifetime of a loan.

For other consumer loans, the Company uses a loss rate approach. In order to estimate the life of a loan, the contractual term of the loan is adjusted for estimated prepayments, which are based on historical prepayment experience.

While the Company’s allowance methodologies strive to reflect all relevant credit risk factors, there continues to be uncertainty associated with, but not limited to, potential imprecision in the estimation process due to the inherent time lag of obtaining information and normal variations between expected and actual outcomes. The Company may hold additional reserves that are designed to provide coverage for losses attributable to such risk. The allowance for loan losses as of June 30, 2020 also included qualitative adjustments for certain industry sectors, such as oil & gas, which are included as part of the C&I loan portfolio, that the Company views as higher risk, where quantitative models may not have captured the additional exposure related to such industry sectors.

Allowance for Individually Assessed Loans When a loan no longer shares similar risk characteristics with other loans, such as in the case for certain nonaccrual or TDR loans, the Company estimates the allowance for loan losses on an individual loan basis. The allowance for loan losses for individually evaluated loans is measured as the difference between the recorded value of the loans and their fair value. For loans evaluated individually, the Company uses one of three different asset valuation measurement methods: (1) the present value of expected future cash flows; (2) the fair value of collateral less costs to sell; and (3) the loan's observable market price. If an individually evaluated loan is determined to be collateral dependent, the Company applies the fair value of the collateral less costs to sell method. If an individually evaluated loan is determined to not be collateral dependent, the Company uses the present value of future cash flows or the observable market value of the loan.

Collateral-Dependent Loans — When a loan is collateral dependent, the allowance is measured on an individual loan basis and is limited to the difference between the recorded value and fair value of the collateral less cost of disposal or sale. As of June 30, 2020, collateral-dependent commercial and consumer loans totaled $88.1 million and $23.8 million, respectively. The Company's commercial collateral-dependent loans were secured by real estate or other collateral. The Company's consumer collateral-dependent loans were all residential mortgage loans, secured by the underlying real estate. As of June 30, 2020, the collateral value of the properties securing each of these collateral dependent loans, net of selling costs, exceeded the recorded value of the individual loans, except for two loans, one C&I loan and one HELOC loan, against which there was a recorded allowance of $756 thousand and $76 thousand, respectively. For the three and six months ended June 30, 2020, there was no significant deterioration or changes in the collateral securing these loans.

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The following tables present summaries of activities in the allowance for loan losses by portfolio segment for the three and six months ended June 30, 2020 and 2019:

($ in thousands)						Three Months Ended June 30, 2020
									Commercial																																										Consumer																														Total
									C&I						CRE																														Residential Mortgage																		Other Consumer
																		CRE						Multi-Family Residential						Construction and Land						Single- Family Residential						HELOCs
Allowance for loan losses, beginning of period						$	362,629					$	132,819					$	16,530					$	11,018					$	26,822					$	3,881					$	3,304					$	557,003
Provision for (reversal of) credit losses on loans			(a)			37,862						43,315						7,908						7,526						(1,667)						205						(849)						94,300
Gross charge-offs						(20,378)						(320)						—						—						—						(221)						(30)						(20,949)
Gross recoveries						602						226						620						7						159						2						93						1,709
Total net (charge-offs) recoveries						(19,776)						(94)						620						7						159						(219)						63						(19,240)
Foreign currency translation adjustments						8						—						—						—						—						—						—						8
Allowance for loan losses, end of period						$	380,723					$	176,040					$	25,058					$	18,551					$	25,314					$	3,867					$	2,518					$	632,071

($ in thousands)						Three Months Ended June 30, 2019
									Commercial																																										Consumer																														Total
									C&I						CRE																														Residential Mortgage																		Other Consumer
																		CRE						Multi-Family Residential						Construction and Land						Single- Family Residential						HELOCs
Allowance for loan losses, beginning of period						$	189,757					$	39,224					$	19,169					$	22,349					$	35,759					$	7,401					$	4,235					$	317,894
Provision for (reversal of) credit losses on loans			(a)			26,140						(1,250)						58						173						(3,068)						(1,224)						(98)						20,731
Gross charge-offs						(11,745)						—						—						—						—						—						(14)						(11,759)
Gross recoveries						1,713						1,837						53						439						72						—						7						4,121
Total net (charge-offs) recoveries						(10,032)						1,837						53						439						72						—						(7)						(7,638)
Foreign currency translation adjustments						(362)						—						—						—						—						—						—						(362)
Allowance for loan losses, end of period						$	205,503					$	39,811					$	19,280					$	22,961					$	32,763					$	6,177					$	4,130					$	330,625

($ in thousands)						Six Months Ended June 30, 2020
									Commercial																																										Consumer																														Total
									C&I						CRE																														Residential Mortgage																		Other Consumer
																		CRE						Multi-Family Residential						Construction and Land						Single- Family Residential						HELOCs
Allowance for loan losses, beginning of period						$	238,376					$	40,509					$	22,826					$	19,404					$	28,527					$	5,265					$	3,380					$	358,287
Impact of ASU 2016-13 adoption						74,237						72,169						(8,112)						(9,889)						(3,670)						(1,798)						2,221						125,158
Allowance for loan losses, January 1, 2020						312,613						112,678						14,714						9,515						24,857						3,467						5,601						483,445
Provision for (reversal of) credit losses on loans			(a)			98,480						54,750						9,189						9,008						33						617						(3,121)						168,956
Gross charge-offs						(32,355)						(1,274)						—						—						—						(221)						(56)						(33,906)
Gross recoveries						2,177						9,886						1,155						28						424						4						94						13,768
Total net (charge-offs) recoveries						(30,178)						8,612						1,155						28						424						(217)						38						(20,138)
Foreign currency translation adjustments						(192)						—						—						—						—						—						—						(192)
Allowance for loan losses, end of period						$	380,723					$	176,040					$	25,058					$	18,551					$	25,314					$	3,867					$	2,518					$	632,071

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($ in thousands)						Six Months Ended June 30, 2019
									Commercial																																										Consumer																														Total
									C&I						CRE																														Residential Mortgage																		Other Consumer
																		CRE						Multi-Family Residential						Construction and Land						Single- Family Residential						HELOCs
Allowance for loan losses, beginning of period						$	189,117					$	40,666					$	19,885					$	20,290					$	31,340					$	5,774					$	4,250					$	311,322
Provision for (reversal of) credit losses on loans			(a)			41,404						(2,914)						(939)						2,169						1,349						401						(99)						41,371
Gross charge-offs						(28,989)						—						—						—						—						—						(28)						(29,017)
Gross recoveries						3,964						2,059						334						502						74						2						7						6,942
Total net (charge-offs) recoveries						(25,025)						2,059						334						502						74						2						(21)						(22,075)
Foreign currency translation adjustments						7						—						—						—						—						—						—						7
Allowance for loan losses, end of period						$	205,503					$	39,811					$	19,280					$	22,961					$	32,763					$	6,177					$	4,130					$	330,625

The following table presents a summary of activities in the allowance for unfunded credit commitments for the three and six months ended June 30, 2020 and 2019:

						Three Months Ended June 30,																		Six Months Ended June 30,
($ in thousands)						2020						2019						2020						2019
Unfunded credit facilities
Allowance for unfunded credit commitments, beginning of period						$	20,829					$	14,505					$	11,158					$	12,566
Impact of ASU 2016-13 adoption						—						—						10,457						—
Provision for (reversal of) credit losses on unfunded credit  commitments			(b)			8,143						(1,486)						7,357						453
Allowance for unfunded credit commitments, end of period						$	28,972					$	13,019					$	28,972					$	13,019
Provision for credit losses			(a) + (b)			$	102,443					$	19,245					$	176,313					$	41,824

The allowance for loan losses as of June 30, 2020 was $632.1 million, an increase of $273.8 million compared with $358.3 million as of December 31, 2019. The overall increase in allowance for loan losses was primarily driven by deteriorating macroeconomic conditions and outlook as a result of the COVID-19 pandemic, which resulted in a provision for credit losses of $102.4 million and $176.3 million for the three and six months ended June 30, 2020, respectively, and the adoption of ASU 2016-13, which increased the allowance for loan losses by $125.2 million on January 1, 2020.

The allowance for unfunded credit commitments is maintained at a level that management believes to be sufficient to absorb estimated expected credit losses related to unfunded credit facilities. See Note 10 — Commitments and Contingencies to the Consolidated Financial Statements in this Form 10-Q for additional information related to unfunded credit commitments.

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The following table presents the Company’s allowance for loan losses and recorded investments by portfolio segments and impairment methodology as of December 31, 2019. This is no longer relevant after December 31, 2019, given the adoption of ASU 2016-13 on January 1, 2020, which has a single impairment methodology:

($ in thousands)						December 31, 2019
									Commercial																																										Consumer																														Total
									C&I						CRE																														Residential Mortgage																		Other Consumer
																		CRE						Multifamily Residential						Construction and Land						Single- Family Residential						HELOCs
Allowance for loan losses
Individually evaluated for impairment						$	2,881					$	97					$	55					$	—					$	35					$	8					$	2,517					$	5,593
Collectively evaluated for impairment						235,495						40,412						22,771						19,404						28,492						5,257						863						352,694
Acquired with deteriorated credit quality						—						—						—						—						—						—						—						—
Total						$	238,376					$	40,509					$	22,826					$	19,404					$	28,527					$	5,265					$	3,380					$	358,287
Recorded investment in loans
Individually evaluated for impairment						$	114,042					$	21,618					$	4,464					$	19,691					$	22,211					$	13,574					$	2,517					$	198,117
Collectively evaluated for impairment						12,035,079						10,143,629						2,829,748						608,768						7,006,768						1,453,162						280,397						34,357,551
Acquired with deteriorated credit quality (1)						1,810						113,201						22,162						40						79,611						6,047						—						222,871
Total (1)						$	12,150,931					$	10,278,448					$	2,856,374					$	628,499					$	7,108,590					$	1,472,783					$	282,914					$	34,778,539

(1)Loans net of ASC 310-10 discount.

Purchased Credit-Deteriorated Loans

On January 1, 2020, the amortized cost basis of the PCD loans was adjusted to reflect the $1.2 million of allowance for loan losses. For the three and six months ended June 30, 2020, the Company did not acquire any PCD loans. For information on PCD loans, see Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Form 10-Q. 

The following table presents the changes in accretable yield on PCI loans for the three and six months ended June 30, 2019:

($ in thousands)																		Three Months Ended June 30, 2019						Six Months Ended June 30, 2019
Accretable yield for PCI loans, beginning of period																		$	68,861					$	74,870
Accretion																		(5,806)						(12,007)
Changes in expected cash flows																		998						1,190
Accretable yield for PCI loans, end of period																		$	64,053					$	64,053

Loans Held-for-Sale

As of June 30, 2020 and December 31, 2019, loans held-for-sale of $3.9 million and $434 thousand, respectively, consisted of single-family residential loans. Refer to Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Loans Held-for-Sale to the Consolidated Financial Statements of the Company’s 2019 Form 10-K for additional details related to the Company’s loans held-for-sale.

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Loan Purchases, Transfers and Sales

The Company purchases and sells loans in the secondary market in the ordinary course of business. From time to time, purchased loans may be transferred from held-for-investment to held-for-sale, and write-downs to allowance for loan losses are recorded, when appropriate. The following tables provide information about the carrying value of loans purchased for the held-for-investment portfolio, loans sold and loans transferred from held-for-investment to held-for-sale at lower of cost or fair value during the three and six months ended June 30, 2020 and 2019:

($ in thousands)						Three Months Ended June 30, 2020
									Commercial																																										Consumer																		Total
									C&I						CRE																														Residential Mortgage
																		CRE						Multifamily Residential						Construction and Land						Single-Family Residential
Loans transferred from held-for-investment to held-for-sale (1)						$	33,060					$	—					$	—					$	—					$	—																	$	33,060
Sales (2)(3)(4)						$	33,060					$	—					$	—					$	—					$	13,708																	$	46,768
Purchases (5)						$	12,503					$	—					$	7					$	—					$	—																	$	12,510

($ in thousands)						Three Months Ended June 30, 2019
									Commercial																																										Consumer																		Total
									C&I						CRE																														Residential Mortgage
																		CRE						Multifamily Residential						Construction and Land						Single-Family Residential
Loans transferred from held-for-investment to held-for-sale (1)						$	79,593					$	—					$	—					$	1,573					$	—																	$	81,166
Sales (2)(3)(4)						$	76,031					$	—					$	—					$	1,573					$	1,172																	$	78,776
Purchases (5)						$	159,100					$	—					$	1,734					$	—					$	17,637																	$	178,471

($ in thousands)						Six Months Ended June 30, 2020
									Commercial																																										Consumer																		Total
									C&I						CRE																														Residential Mortgage
																		CRE						Multifamily Residential						Construction and Land						Single-Family Residential
Loans transferred from held-for-investment to held-for-sale (1)						$	136,033					$	7,250					$	—					$	—					$	—																	$	143,283
Sales (2)(3)(4)						$	136,033					$	7,250					$	—					$	—					$	18,350																	$	161,633
Purchases (5)						$	143,086					$	—					$	1,520					$	—					$	1,084																	$	145,690

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($ in thousands)						Six Months Ended June 30, 2019
									Commercial																																										Consumer																		Total
									C&I						CRE																														Residential Mortgage
																		CRE						Multifamily Residential						Construction and Land						Single-Family Residential
Loans transferred from held-for-investment to held-for-sale (1)						$	155,166					$	16,655					$	—					$	1,573					$	—																	$	173,394
Sales (2)(3)(4)						$	151,677					$	16,655					$	—					$	1,573					$	3,614																	$	173,519
Purchases (5)						$	266,294					$	—					$	5,952					$	—					$	54,039																	$	326,285

(1)The Company recorded no write-downs to the allowance for loan losses related to loans transferred from held-for-investment to held-for-sale for both the three and six months ended June 30, 2020 and $317 thousand and $390 thousand for the same periods in 2019, respectively.

(2)Includes originated loans sold of $46.8 million and $161.6 million for the three and six months ended June 30, 2020, respectively, and $55.7 million and $132.2 million for the same periods in 2019, respectively. Originated loans sold were primarily C&I and single-family residential loans during the three and six months ended June 30, 2020. In comparison, originated loans sold were primarily C&I loans for the same periods in 2019.

(3)Includes none of the purchased loans sold in the secondary market for both the three and six months ended June 30, 2020 and $23.1 million and $41.3 million for the same periods in 2019, respectively.

(4)Net gains on sales of loans were $132 thousand and $1.1 million for the three and six months ended June 30, 2020, respectively, and $15 thousand and $930 thousand for the same periods in 2019, respectively.

(5)C&I loan purchases for each of the three and six months ended June 30, 2020 and 2019 were comprised primarily of syndicated C&I term loans.

Note 8 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities

The Community Reinvestment Act (“CRA”) encourages banks to meet the credit needs of their communities for housing and other purposes, particularly in low- and moderate-income neighborhoods. The Company invests in certain affordable housing projects in the form of ownership interests in limited partnerships or limited liability companies that qualify for CRA and tax credits. These entities are formed to develop and operate apartment complexes designed as high-quality affordable housing for lower income tenants throughout the U.S. To fully utilize the available tax credits, each of these entities must meet the regulatory affordable housing requirements for a minimum 15-year compliance period. In addition to affordable housing projects, the Company also invests in New Market Tax Credit projects that qualify for CRA credits, as well as eligible projects that qualify for renewable energy and historic tax credits. Investments in renewable energy tax credits help promote the development of renewable energy sources, and the investments in historic tax credits promote the rehabilitation of historic buildings and economic revitalization of the surrounding areas.

Investments in Qualified Affordable Housing Partnerships, Net

The Company records its investments in qualified affordable housing partnerships, net, using the proportional amortization method. Under the proportional amortization method, the Company amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received, and recognizes the amortization in Income tax expense on the Consolidated Statement of Income.

The following table presents the Company’s investments in qualified affordable housing partnerships, net, and related unfunded commitments as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020						December 31, 2019
Investments in qualified affordable housing partnerships, net						$	201,888					$	207,037
Accrued expenses and other liabilities — Unfunded commitments						$	72,655					$	80,294

The following table presents additional information related to the Company’s investments in qualified affordable housing partnerships, net, for the three and six months ended June 30, 2020 and 2019:

($ in thousands)						Three Months Ended June 30,																		Six Months Ended June 30,
									2020						2019						2020						2019
Tax credits and other tax benefits recognized						$	11,772					$	11,506					$	22,803					$	23,332
Amortization expense included in income tax expense						$	9,148					$	9,657					$	17,532					$	18,554

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Investments in Tax Credit and Other Investments, Net

Depending on the ownership percentage and the influence the Company has on the investments in tax credit and other investments, net, the Company applies the equity or cost method of accounting, or the measurement alternative as elected under ASU 2016-01 for equity investments without readily determinable fair value.

The following table presents the Company’s investments in tax credit and other investments, net, and related unfunded commitments as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020						December 31, 2019
Investments in tax credit and other investments, net						$	251,318					$	254,140
Accrued expenses and other liabilities — Unfunded commitments						$	106,969					$	113,515

Amortization of tax credit and other investments was $24.8 million and $42.1 million, respectively, for the three and six months ended June 30, 2020, as compared with $16.7 million and $41.6 million, respectively, for the same periods in 2019.

Included in Investments in tax credit and other investments, net, on the Consolidated Balance Sheet were equity securities with readily determinable fair values of $31.1 million and $31.7 million, as of June 30, 2020 and December 31, 2019, respectively. These equity securities were CRA investments measured at fair value with changes in fair value recorded in net income. The Company recorded unrealized gains on these equity securities of $720 thousand and $758 thousand during the three and six months ended June 30, 2020, respectively, and unrealized gains of $375 thousand and $767 thousand, respectively, for the same periods in 2019.

The Company held equity securities without readily determinable fair values at carrying value totaling $18.8 million and $19.1 million as of June 30, 2020 and December 31, 2019, respectively, which were measured using the measurement alternative at cost less impairment and adjusted for observable price changes. For the three and six months ended June 30, 2020 and 2019, there were no adjustments to these securities.

The Company recorded an impairment recovery of $109 thousand related to one historic tax credit investment and impairment recoveries of $259 thousand related to two historic tax credit investments for the three and six months ended June 30, 2020, respectively. During the second quarter of 2020, the Company also recorded $733 thousand OTTI charge related to one historic tax credit and one CRA investment. In comparison, the Company recorded an OTTI charge of $2.9 million and $9.9 million, respectively, and no impairment recovery for the three and six months ended June 30, 2019. OTTI charges and impairment recoveries are recorded within Amortization of tax credit and other investments on the Consolidated Statement of Income for the three and six months ended June 30, 2020 and 2019.

Variable Interest Entities

The Company invests in unconsolidated limited partnerships and similar entities that construct, own and operate affordable housing, historic rehabilitation projects, wind and solar projects, of which the majority of such investments are Variable interest entities (“VIEs”). As a limited partner in these partnerships, these investments are designed to generate a return primarily through the realization of federal tax credits and tax benefits. An unrelated third party is typically the general partner or managing member who has control over the significant activities of such investments. While the Company’s interest in some of the investments may exceed 50% of the outstanding equity interests, the Company does not consolidate these structures due to the general partner or managing member’s ability to manage the entity, which is indicative of power over them. The Company’s maximum exposure to loss in connection with these partnerships consist of the unamortized investment balance and any tax credits claimed that may become subject to recapture.

Special purpose entities formed in connection with securitization transactions are generally considered VIEs. The Company is the servicer of the multifamily residential loans it has securitized in 2016. The Company does not consolidate the multifamily securitization entity because it does not have power and does not have a variable interest that could potentially be significant to the VIE. A CLO is a VIE that purchases a pool of assets consisting primarily of non-investment grade corporate loans and issues multiple tranches of notes to investors to fund the asset purchases and pay upfront expenses associated with forming the CLO. The Company serves as the collateral manager of a CLO that closed in the fourth quarter of 2019 and retained substantially all of the investment grade rated securities issued by the CLO. In accordance with GAAP, the Company does not consolidate the CLO as it does not hold interests that could potentially be significant to the CLO. The Company’s maximum exposure to loss from the CLO is equal to the carrying amount of the retained securities of $274.0 million and $284.7 million as of June 30, 2020 and December 31, 2019, respectively.

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Note 9 — Goodwill and Other Intangible Assets

Goodwill

Total goodwill was $465.7 million as of both June 30, 2020 and December 31, 2019. Goodwill represents the excess of the purchase price over the fair value of net assets acquired in an acquisition. The Company assesses goodwill for impairment at the reporting unit level, equivalent to the same level as the Company’s business segments. This assessment is performed on an annual basis as of December 31 each year, or more frequently if events or circumstances, such as adverse changes in the economic or business environment, indicate there may be impairment. The Company organizes its operation into three reporting segments: (1) Consumer and Business Banking; (2) Commercial Banking; and (3) Other. For information on how the reporting units are identified and the components are aggregated, see Note 15 — Business Segments to the Consolidated Financial Statements in this Form 10-Q.

There was no change in the carrying amount of goodwill during the three and six months ended June 30, 2020. The following table presents changes in the carrying amount of goodwill by reporting unit during the six months ended June 30, 2019:

($ in thousands)						Consumer and Business Banking						Commercial Banking						Total
Beginning balance, January 1, 2019						$	353,321					$	112,226					$	465,547
Acquisition of East West Capital Markets, LLC						—						150						150
Ending balance, June 30, 2019						$	353,321					$	112,376					$	465,697

Impairment Analysis

The Company performed its annual impairment analysis as of December 31, 2019, and concluded that there was no goodwill impairment as the fair value of all reporting units exceeded the carrying amount of their respective reporting unit. Given the economic and market deterioration as a result of the COVID-19 outbreak and public health response to contain it, the Company further evaluated goodwill by assessing if the fair value of all reporting units exceeded the carrying amount of the respective reporting units by performing a goodwill impairment analysis as of March 31, 2020 and concluded that no impairment was warranted. While there is uncertainty in the duration of the COVID-19 impact and the reopening of the economy, the Company did not note further stressed macroeconomic conditions, adverse market conditions, deterioration of the Company’s financial performance, any other significant events, that negatively impacted the fair value of its reporting units during the three months ended June 30, 2020. Based on this, the Company concluded that there was no goodwill impairment as of June 30, 2020. Refer to Note 9 — Goodwill and Other Intangible Assets to the Consolidated Financial Statements of the Company’s 2019 Form 10-K for additional details related to the Company’s annual goodwill impairment analysis.

Core Deposit Intangibles

Core deposit intangibles represent the intangible value of depositor relationships resulting from deposit liabilities assumed in various acquisitions and are included in Other assets on the Consolidated Balance Sheet. These intangibles are tested for impairment on an annual basis, or more frequently as events occur or current circumstances and conditions warrant. There were no impairment write-downs on the core deposit intangibles for each of the three and six months ended June 30, 2020 and 2019.

The following table presents the gross carrying amount of core deposit intangible assets and accumulated amortization as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020						December 31, 2019
Gross balance (1)						$	86,099					$	86,099
Accumulated amortization (1)						(77,972)						(76,088)
Net carrying balance (1)						$	8,127					$	10,011

(1)Excludes fully amortized core deposit intangible assets.

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Amortization Expense

The Company amortizes the core deposit intangibles based on the projected useful lives of the related deposits. The amortization expense related to the core deposit intangible assets was $931 thousand and $1.1 million for the three months ended June 30, 2020 and 2019, respectively, and $1.9 million and $2.3 million for the six months ended June 30, 2020 and 2019, respectively.

The following table presents the estimated future amortization expense of core deposit intangibles as of June 30, 2020:

($ in thousands)						Amount
Remainder of 2020						$	1,750
2021						2,749
2022						1,865
2023						1,199
2024						553
Thereafter						11
Total						$	8,127

Note 10 — Commitments and Contingencies

Commitments to Extend Credit — In the normal course of business, the Company provides customers loan commitments on predetermined terms. These outstanding commitments to extend credit are not reflected in the accompanying Consolidated Financial Statements. While the Company does not anticipate losses as a result of these transactions, commitments to extend credit are included in determining the appropriate level of the allowance for unfunded credit commitments, and outstanding commercial and SBLCs.

The following table presents the Company’s credit-related commitments as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020						December 31, 2019
Loan commitments						$	5,131,120					$	5,330,211
Commercial letters of credit and SBLCs						$	2,005,402					$	1,860,414

Loan commitments are agreements to lend to customers provided that there are no violations of any conditions established in the agreement. Commitments generally have fixed expiration dates or other termination clauses and may require maintenance of compensatory balances. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future funding requirements.

Commercial letters of credit are issued to facilitate domestic and foreign trade transactions, while SBLCs are generally contingent upon the failure of the customers to perform according to the terms of the underlying contract with the third party. As a result, the total contractual amounts do not necessarily represent future funding requirements. The Company’s historical experience is that SBLCs typically expire without being funded. Additionally, in many cases, the Company holds collateral in various forms against these SBLCs. As part of its risk management activities, the Company monitors the creditworthiness of customers in conjunction with its SBLC exposure. Customers are obligated to reimburse the Company for any payment made on the customers’ behalf. If the customers fail to pay, the Company would, as applicable, liquidate the collateral and/or offset accounts. As of June 30, 2020, total letters of credit of $2.01 billion consisted of SBLCs of $1.93 billion and commercial letters of credit of $72.3 million.

The Company applies the same credit underwriting criteria to extend loans, commitments and conditional obligations to customers. Each customer’s creditworthiness is evaluated on a case-by-case basis. Collateral and financial guarantees may be obtained based on management’s assessment of a customer’s credit. Collateral may include cash, accounts receivable, inventory, property, plant and equipment, and income-producing commercial property.

Estimated exposure to loss from these commitments is included in the allowance for unfunded credit commitments and amounted to $28.9 million as of June 30, 2020 and $11.1 million as of December 31, 2019.

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Guarantees — The Company sells or securitizes single-family and multifamily residential loans with recourse in the ordinary course of business. The recourse component of the loans sold or securitized with recourse is considered a guarantee. As the guarantor, the Company is obligated to repurchase up to the recourse component of the loans if the loans default. The following table presents the types of guarantees the Company had outstanding as of June 30, 2020 and December 31, 2019:

($ in thousands)						Maximum Potential Future Payments																		Carrying Value
									June 30, 2020						December 31, 2019						June 30, 2020						December 31, 2019
Single-family residential loans sold or securitized with recourse						$	11,501					$	12,578					$	11,501					$	12,578
Multifamily residential loans sold or securitized with recourse						15,682						15,892						30,152						40,708
Total						$	27,183					$	28,470					$	41,653					$	53,286

The Company’s recourse reserve related to these guarantees is included in the allowance for unfunded credit commitments and totaled $85 thousand and $76 thousand as of June 30, 2020 and December 31, 2019, respectively. The allowance for unfunded credit commitments is included in Accrued expenses and other liabilities on the Consolidated Balance Sheet. The Company continues to experience minimal losses from the single-family and multifamily residential loan portfolios sold or securitized with recourse.

Litigation — The Company is a party to various legal actions arising in the course of its business. In accordance with ASC 450, Contingencies, the Company accrues reserves for outstanding lawsuits, claims and proceedings when a loss contingency is probable and can be reasonably estimated. The Company estimates the amount of loss contingencies using current available information from legal proceedings, advice from legal counsel and available insurance coverage. Due to the inherent subjectivity of the assessments and unpredictability of the outcomes of the legal proceedings, any amounts accrued or included in this aggregate amount may not represent the ultimate loss to the Company from the legal proceedings in question. Thus, the Company’s exposure and ultimate losses may be higher, and possibly significantly more than the amounts accrued.

Other Commitments — The Company has commitments to invest in qualified affordable housing partnerships, tax credit and other investments as discussed in Note 8 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities to the Consolidated Financial Statements in this Form 10-Q. As of June 30, 2020 and December 31, 2019, these commitments were $179.6 million and $193.8 million, respectively. These commitments are included in Accrued expenses and other liabilities on the Consolidated Balance Sheet.

Note 11 — Revenue from Contracts with Customers

The following tables present revenue from contracts with customers within the scope of ASC 606, Revenue from Contracts with Customers, and other noninterest income, segregated by operating segments for the three and six months ended June 30, 2020 and 2019:

($ in thousands)						Three Months Ended June 30, 2020
									Consumer and Business Banking						Commercial Banking						Other						Total
Noninterest income:
Revenue from contracts with customers:
Deposit account fees:
Deposit service charges and related fee income						$	6,166					$	3,904					$	41					$	10,111
Card income						639						122						—						761
Wealth management fees						2,691						400						—						3,091
Total revenue from contracts with customers						$	9,496					$	4,426					$	41					$	13,963
Other sources of noninterest income (1)						4,447						29,461						10,766						44,674
Total noninterest income						$	13,943					$	33,887					$	10,807					$	58,637

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($ in thousands)						Three Months Ended June 30, 2019
									Consumer and Business Banking						Commercial Banking						Other						Total
Noninterest income:
Revenue from contracts with customers:
Deposit account fees:
Deposit service charges and related fee income						$	5,397					$	3,299					$	10					$	8,706
Card income						747						154						—						901
Wealth management fees						3,565						235						—						3,800
Total revenue from contracts with customers						$	9,709					$	3,688					$	10					$	13,407
Other sources of noninterest income (1)						4,794						29,968						4,590						39,352
Total noninterest income						$	14,503					$	33,656					$	4,600					$	52,759

($ in thousands)						Six Months Ended June 30, 2020
									Consumer and Business Banking						Commercial Banking						Other						Total
Noninterest income:
Revenue from contracts with customers:
Deposit account fees:
Deposit service charges and related fee income						$	11,710					$	7,703					$	47					$	19,460
Card income						1,537						322						—						1,859
Wealth management fees						7,704						740						—						8,444
Total revenue from contracts with customers						$	20,951					$	8,765					$	47					$	29,763
Other sources of noninterest income (1)						9,394						57,578						15,951						82,923
Total noninterest income						$	30,345					$	66,343					$	15,998					$	112,686

($ in thousands)						Six Months Ended June 30, 2019
									Consumer and Business Banking						Commercial Banking						Other						Total
Noninterest income:
Revenue from contracts with customers:
Deposit account fees:
Deposit service charges and related fee income						$	10,630					$	6,573					$	26					$	17,229
Card income						1,507						339						—						1,846
Wealth management fees						7,233						341						—						7,574
Total revenue from contracts with customers						$	19,370					$	7,253					$	26					$	26,649
Other sources of noninterest income (1)						8,905						50,947						8,389						68,241
Total noninterest income						$	28,275					$	58,200					$	8,415					$	94,890

(1)Primarily represents revenue from contracts with customers that are out of the scope of ASC 606, Revenue from Contracts with Customers.

Generally, the Company recognizes revenue from contracts with customers when it satisfies its performance obligations. The Company’s performance obligations are typically satisfied as services are rendered. The Company generally records contract liabilities, or deferred revenue, when payments from customers are received or due in advance of providing services. The Company records contract assets when services are provided to customers before payment is received or before payment is due. Since the Company receives payments for its services during the period or at the time services are provided, there were no contract assets or contract liabilities as of both June 30, 2020 and December 31, 2019.

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The major revenue streams by fee type that are within the scope of ASC 606 presented in the above tables are described in additional detail below:

Deposit Account Fees — Deposit Service Charges and Related Fee Income

The Company offers a range of deposit products to individuals and businesses, which includes savings, money market, checking and time deposit accounts. The deposit account services include ongoing account maintenance, as well as certain optional services such as automated teller machine usage, wire transfer services or check orders. In addition, treasury management and business account analysis services are offered to commercial deposit customers. The monthly account fees may vary with the amount of average monthly deposit balances maintained, or the Company may charge a fixed monthly account maintenance fee if certain average balances are not maintained. In addition, each time a deposit customer selects an optional service, the Company may earn transactional fees, generally recognized by the Company at the point when the transaction occurs. For business analysis accounts, commercial deposit customers receive an earnings credit based on their account balance, which can be used to offset the cost of banking and treasury management services. Business analysis accounts that are assessed fees in excess of earnings credits received are typically charged at the end of each month, after all transactions are known and the credits are calculated.

Deposit Account Fees — Card Income

Card income is comprised of merchant referral fees and interchange income. For merchant referral fees, the Company provides marketing and referral services to acquiring banks for merchant card processing services and earns variable referral fees based on transaction activities. The Company satisfies its performance obligation over time as the Company identifies, solicits, and refers business customers who are provided such services. The Company receives monthly fees net of consideration it pays to the acquiring bank performing the merchant card processing services. The Company recognizes revenue on a monthly basis when the uncertainty associated with the variable referral fees is resolved after the Company receives monthly statements from the acquiring bank. For interchange income, the Company, as a card issuer, has a stand ready performance obligation to authorize, clear, and settle card transactions. The Company earns, or pays, interchange fees, which are percentage-based on each transaction, and based on rates published by the corresponding payment network for transactions processed using their network. The Company measures its progress toward the satisfaction of its performance obligation over time, as services are rendered, and the Company provides continuous access to this service and settles transactions as its customer or the payment network requires. Interchange income is presented net of direct costs paid to the customer and entities in their distribution chain, which are transaction-based expenses such as rewards program expenses and certain network costs. Revenue is recognized when the net profit is determined by the payment networks at the end of each day.

Wealth Management Fees

The Company provides investment planning services for customers including wealth management services, asset allocation strategies, portfolio analysis and monitoring, investment strategies, and risk management strategies. The fees the Company earns are variable and are generally received monthly. The Company recognizes revenue for the services performed at quarter-end based on actual transaction details received from the broker-dealer the Company engages.

Practical Expedients and Exemptions

The Company applies the practical expedient in ASC 606-10-50-14 and does not disclose the value of unsatisfied performance obligations as the Company’s contracts with customers generally have a term that is less than one year, are open-ended with a cancellation period that is less than one year, or allow the Company to recognize revenue in the amount to which the Company has the right to invoice.

In addition, given the short-term nature of the contracts, the Company also applies the practical expedient in ASC 606-10-32-18 and does not adjust the consideration from customers for the effects of a significant financing component, if at contract inception, the period between when the entity transfers the goods or services and when the customer pays for that good or service is one year or less.

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Note 12 — Stock Compensation Plans

Pursuant to the Company’s 2016 Stock Incentive Plan, as amended, the Company may issue stocks, stock options, restricted stock, restricted stock units (“RSUs”), stock purchase warrants, stock appreciation rights, phantom stock and dividend equivalents to eligible employees, non-employee directors, consultants, and other service providers of the Company and its subsidiaries. There were no outstanding stock awards other than RSUs as of both June 30, 2020 and December 31, 2019.

The following table presents a summary of the total share-based compensation expense and the related net tax (deficiencies) benefits associated with the Company’s various employee share-based compensation plans for the three and six months ended June 30, 2020 and 2019:

($ in thousands)						Three Months Ended June 30,																		Six Months Ended June 30,
									2020						2019						2020						2019
Stock compensation costs						$	7,071					$	8,081					$	14,280					$	15,525
Related net tax (deficiencies) benefits for stock compensation plans						$	(9)					$	1					$	(1,575)					$	4,708

Restricted Stock Units — RSUs are granted under the Company’s long-term incentive plan at no cost to the recipient. RSUs cliff vest after three years of continued employment from the date of the grant and are authorized to settle predominantly in shares of the Company’s common stock. Certain RSUs will be settled in cash. RSUs entitle the recipient to receive cash dividend equivalents to any dividends paid on the underlying common stock during the period RSUs are outstanding. The dividends are accrued during the vesting period and are paid at the time of vesting. While a portion of RSUs are time-vesting awards, others vest subject to the attainment of specified performance goals referred to as “performance-based RSUs.” Substantially all RSUs are subject to forfeiture until vested unless otherwise specified in the employment terms.

Performance-based RSUs are granted at the target amount of awards. Based on the Company’s attainment of specified performance goals and consideration of market conditions, the number of shares that vest can be adjusted to a minimum of 0% and to a maximum of 200% of the target. The amount of performance-based RSUs that are eligible to vest is determined at the end of each performance period and is then added together as the total number of performance shares to vest. Performance-based RSUs cliff vest three years from the date of each grant.

Compensation costs for the time-based awards that will be settled in shares of the Company’s common stock are based on the quoted market price of the Company’s common stock at the grant date. Compensation costs for certain time-based awards that will be settled in cash are adjusted to fair value based on changes in the share price of the Company’s common stock up to the settlement date. Compensation costs associated with performance-based RSUs are based on grant date fair value which considers both market and performance conditions, and is subject to subsequent adjustments based on the changes in the Company’s projected outcome of the performance criteria. Compensation costs of both time-based and performance-based awards are estimated based on awards ultimately expected to vest and recognized on a straight-line basis from the grant date until the vesting date of each grant.

The following table presents a summary of the activities for the Company’s time-based and performance-based RSUs that will be settled in shares for the six months ended June 30, 2020. The number of outstanding performance-based RSUs stated below assumes the associated performance targets will be met at the target level:

																														Time-Based RSUs																		Performance-Based RSUs
																																	Shares						Weighted-Average Grant Date Fair Value						Shares						Weighted-Average Grant Date Fair Value
Outstanding, January 1, 2020																														1,139,868						$	57.78					386,483						$	60.13
Granted																														657,461						40.51						165,084						39.79
Vested																														(251,526)						54.47						(131,597)						56.59
Forfeited																														(100,371)						54.33						—						—
Outstanding, June 30, 2020																														1,445,432						$	50.74					419,970						$	53.24

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The following table presents a summary of the activities for the Company’s time-based RSUs that will be settled in cash for the six months ended June 30, 2020:

												Shares
Outstanding, January 1, 2020												11,638
Granted												11,215
Vested												(723)
Forfeited												—
Outstanding, June 30, 2020												22,130

As of June 30, 2020, there were $31.4 million and $19.6 million of total unrecognized compensation costs related to unvested time-based and performance-based RSUs, respectively. These costs are expected to be recognized over a weighted-average period of 2.04 years and 2.07 years, respectively.

Note 13 — Stockholders’ Equity and Earnings Per Share

The following table presents the basic and diluted EPS calculations for the three and six months ended June 30, 2020 and 2019. For more information on the calculation of EPS, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Earnings Per Share to the Consolidated Financial Statements of the Company’s 2019 Form 10-K.

($ and shares in thousands, except per share data)						Three Months Ended June 30,																		Six Months Ended June 30,
									2020						2019						2020						2019
Basic:
Net income						$	99,352					$	150,380					$	244,176					$	314,404
Basic weighted-average number of shares outstanding						141,486						145,546						143,150						145,402
Basic EPS						$	0.70					$	1.03					$	1.71					$	2.16
Diluted:
Net income						$	99,352					$	150,380					$	244,176					$	314,404
Basic weighted-average number of shares outstanding (1)						141,486						145,546						143,150						145,402
Diluted potential common shares (2)						341						506						410						614
Diluted weighted-average number of shares outstanding (1)(2)						141,827						146,052						143,560						146,016
Diluted EPS						$	0.70					$	1.03					$	1.70					$	2.15

(1)The Company acquired MetroCorp Bancshares, Inc. (“MetroCorp”) on January 17, 2014. Prior to the acquisition, MetroCorp had outstanding warrants to purchase 771,429 shares of its common stock. Upon the acquisition, the rights of the warrant holders were converted into the rights to acquire 230,282 shares of East West’s common stock until January 16, 2019. All warrants were exercised on January 7, 2019.

(2)Includes dilutive shares from RSUs for the three and six months ended June 30, 2020 and 2019.

For the three and six months ended June 30, 2020, 1.2 million and 620 thousand weighted-average shares of anti-dilutive RSUs, respectively, were excluded from the diluted EPS computation. In comparison, 584 thousand and 239 thousand weighted-average shares of anti-dilutive RSUs, respectively, were excluded from the diluted EPS computation for the three and six months ended June 30, 2019.

Stock Repurchase Program — On March 3, 2020, the Company’s Board of Directors authorized a stock repurchase program to buy back up to $500.0 million of the Company’s common stock. For the three months ended June 30, 2020, there were no share repurchases. For the six months ended June 30, 2020, the Company repurchased 4,471,682 shares at an average price of $32.64 per share and a total cost of $146.0 million. The Company did not repurchase any shares during the three and six months ended June 30, 2019.

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Note 14 — Accumulated Other Comprehensive Income (Loss)

The following tables present the changes in the components of AOCI balances for the three and six months ended June 30, 2020 and 2019:

($ in thousands)						AFS Debt Securities						Cash Flow Hedges						Foreign Currency Translation Adjustments (1)						Total
Balance, April 1, 2019						$	(23,810)					$	—					$	(9,173)					$	(32,983)
Net unrealized gains (losses) arising during the period						30,046						—						(6,016)						24,030
Amounts reclassified from AOCI						(1,019)						—						—						(1,019)
Changes, net of tax						29,027						—						(6,016)						23,011
Balance, June 30, 2019						$	5,217					$	—					$	(15,189)					$	(9,972)
Balance, April 1, 2020						$	25,034					$	—					$	(18,153)					$	6,881
Net unrealized gains (losses) arising during the period						24,606						(1,063)						(230)						23,313
Amounts reclassified from AOCI						(6,790)						(270)						—						(7,060)
Changes, net of tax						17,816						(1,333)						(230)						16,253
Balance, June 30, 2020						$	42,850					$	(1,333)					$	(18,383)					$	23,134

($ in thousands)						AFS Debt Securities						Cash Flow Hedges						Foreign Currency Translation Adjustments (1)						Total
Balance, January 1, 2019						$	(45,821)					$	—					$	(12,353)					$	(58,174)
Net unrealized gains (losses) arising during the period						53,157						—						(2,836)						50,321
Amounts reclassified from AOCI						(2,119)						—						—						(2,119)
Changes, net of tax						51,038						—						(2,836)						48,202
Balance, June 30, 2019						$	5,217					$	—					$	(15,189)					$	(9,972)
Balance, January 1, 2020						$	(2,419)					$	—					$	(15,989)					$	(18,408)
Net unrealized gains (losses) arising during the period						53,136						(1,063)						(2,394)						49,679
Amounts reclassified from AOCI						(7,867)						(270)						—						(8,137)
Changes, net of tax						45,269						(1,333)						(2,394)						41,542
Balance, June 30, 2020						$	42,850					$	(1,333)					$	(18,383)					$	23,134

(1)Represents foreign currency translation adjustments related to the Company’s net investment in non-U.S. operations, including related hedges. The functional currency and reporting currency of the Company’s foreign subsidiary was RMB and USD, respectively.

The following tables present the components of other comprehensive income (loss), reclassifications to net income and the related tax effects for the three and six months ended June 30, 2020 and 2019:

($ in thousands)						Three Months Ended June 30,
									2020																														2019
									Before-Tax						Tax Effect						Net-of-Tax						Before-Tax						Tax Effect						Net-of-Tax
AFS debt securities:
Net unrealized gains arising during the period						$	34,970					$	(10,364)					$	24,606					$	44,531					$	(14,485)					$	30,046
Net realized (gains) reclassified into net income (1)						(9,640)						2,850						(6,790)						(1,447)						428						(1,019)
Net change						25,330						(7,514)						17,816						43,084						(14,057)						29,027
Cash flow hedges
Net unrealized (losses) arising during the period						(1,483)						420						(1,063)						—						—						—
Net realized (gains) reclassified into net income (2)						(377)						107						(270)						—						—						—
Net change						(1,860)						527						(1,333)						—						—						—
Foreign currency translation adjustments, net of hedges:
Net unrealized (losses) arising during the period						(379)						149						(230)						(2,989)						(3,027)						(6,016)
Net change						(379)						149						(230)						(2,989)						(3,027)						(6,016)
Other comprehensive income (loss)						$	23,091					$	(6,838)					$	16,253					$	40,095					$	(17,084)					$	23,011

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($ in thousands)						Six Months Ended June 30,
									2020																														2019
									Before-Tax						Tax Effect						Net-of-Tax						Before-Tax						Tax Effect						Net-of-Tax
AFS debt securities:
Net unrealized gains arising during the period						$	75,463					$	(22,327)					$	53,136					$	75,469					$	(22,312)					$	53,157
Net realized (gains) reclassified into net income (1)						(11,169)						3,302						(7,867)						(3,008)						889						(2,119)
Net change						64,294						(19,025)						45,269						72,461						(21,423)						51,038
Cash flow hedges
Net unrealized (losses) arising during the period						(1,483)						420						(1,063)						—						—						—
Net realized (gains) reclassified into net income (2)						(377)						107						(270)						—						—						—
Net change						(1,860)						527						(1,333)						—						—						—
Foreign currency translation adjustments, net of hedges:
Net unrealized (losses) arising during the period						(2,145)						(249)						(2,394)						191						(3,027)						(2,836)
Net change						(2,145)						(249)						(2,394)						191						(3,027)						(2,836)
Other comprehensive income (loss)						$	60,289					$	(18,747)					$	41,542					$	72,652					$	(24,450)					$	48,202

(1)For the three and six months ended June 30, 2020 and 2019, pre-tax amounts were reported in Gains on sales of AFS debt securities on the Consolidated Statement of Income.

(2)For the three and six months ended June 30, 2020 and 2019, pre-tax amounts were reported in Interest expense on the Consolidated Statement of Income.

Note 15 — Business Segments

The Company organizes its operations into three reportable operating segments: (1) Consumer and Business Banking; (2) Commercial Banking; and (3) Other. These segments are defined by the type of customers served, and the related products and services provided. The segments reflect how financial information is currently evaluated by management. Operating segment results are based on the Company’s internal management reporting process, which reflects assignments and allocations of certain balance sheet and income statement items. The information presented is not indicative of how the segments would perform if they operated as independent entities due to the interrelationships among the segments.

The Consumer and Business Banking segment primarily provides financial products and services to consumer and commercial customers through the Company’s domestic branch network. This segment offers consumer and commercial deposits, mortgage and home equity loans, and other products and services. It also originates commercial loans for small and medium-sized enterprises through the Company’s branch network. Other products and services provided by this segment include wealth management, treasury management and foreign exchange services.

The Commercial Banking segment primarily generates commercial loans and deposits. Commercial loan products include commercial business loans and lines of credit, trade finance loans and letters of credit, CRE loans, construction and land loans, affordable housing loans and letters of credit, asset-based lending, and equipment financing. Commercial deposit products and other financial services include treasury management, foreign exchange services, and interest rate and commodity risk hedging.

The remaining centralized functions, including the corporate treasury activities of the Company and eliminations of inter-segment amounts, have been aggregated and included in the Other segment, which provides broad administrative support to the two core segments, namely the Consumer and Business Banking and the Commercial Banking segments.

The Company utilizes an internal reporting process to measure the performance of the three operating segments within the Company. The internal reporting process derives operating segment results by utilizing allocation methodologies for revenue and expenses. Net interest income of each segment represents the difference between actual interest earned on assets and interest incurred on liabilities of the segment, adjusted for funding charges or credits through the Company’s internal funds transfer pricing (“FTP”) process. Noninterest income and noninterest expense directly attributable to a business segment are assigned to that segment. Indirect costs, including technology-related costs and corporate overhead, are allocated based on a segment’s estimated usage using factors including but not limited to, full-time equivalent employees, net interest income, and loan and deposit volume. Charge-offs are allocated to the segment directly associated with the loans charged off, and the remaining provision for credit losses is allocated to each segment based on loan volume. The Company’s internal reporting process utilizes a full-allocation methodology. Under this methodology, corporate and indirect expenses incurred by the Other segment are allocated to the Consumer and Business Banking and the Commercial Banking segments, except certain corporate treasury-related expenses and insignificant unallocated expenses.

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The corporate treasury function within the Other segment is responsible for liquidity and interest rate management of the Company. The Company’s internal FTP process is also managed by the corporate treasury function within the Other segment. The process is formulated with the goal of encouraging loan and deposit growth that is consistent with the Company’s overall profitability objectives, as well as to provide a reasonable and consistent basis for the measurement of its business segments’ net interest margins and profitability. The FTP process charges a cost to fund loans (“FTP charges for loans”) and allocates credits for funds provided from deposits (“FTP credits for deposits”) using internal FTP rates. FTP charges for loans are determined based on a matched cost of funds, which is tied to the pricing and term characteristics of the loans. FTP credits for deposits are based on matched funding credit rates, which are tied to the implied or stated maturity of the deposits. FTP credits for deposits reflect the long-term value generated by the deposits. The net spread between the total internal FTP charges and credits is recorded as part of net interest income in the Other segment. The FTP process transfers the corporate interest rate risk exposure to the treasury function within the Other segment, where such exposures are centrally managed.

The Company’s internal FTP assumptions and methodologies are reviewed at least annually to ensure that the process is reflective of current market conditions. During the third quarter of 2019, the Company enhanced its FTP methodology related to deposits by setting a minimum floor rate using the short-term FHLB rate as a reference rate for the FTP credits paid for deposits in event of the flattened and inverted yield curve. This methodology has been retrospectively applied to segment financial results for the three and six months ended June 30, 2019, and the process is effectively reflecting the current market conditions as of June 30, 2020.

The following tables present the operating results and other key financial measures for the individual operating segments as of and for the three and six months ended June 30, 2020 and 2019:

($ in thousands)						Consumer and Business Banking						Commercial Banking						Other						Total
Three Months Ended June 30, 2020
Net interest income before provision for credit losses						$	124,926					$	183,796					$	35,053					$	343,775
Provision for credit losses						5,590						96,853						—						102,443
Noninterest income						13,943						33,887						10,807						58,637
Noninterest expense						80,164						64,900						42,632						187,696
Segment income before income taxes						53,115						55,930						3,228						112,273
Segment net income						$	38,058					$	40,178					$	21,116					$	99,352
As of June 30, 2020
Segment assets						$	12,666,938					$	26,984,013					$	9,756,642					$	49,407,593

($ in thousands)						Consumer and Business Banking						Commercial Banking						Other						Total
Three Months Ended June 30, 2019
Net interest income before provision for credit losses						$	180,911					$	158,941					$	27,474					$	367,326
Provision for credit losses						1,616						17,629						—						19,245
Noninterest income						14,503						33,656						4,600						52,759
Noninterest expense						83,656						67,303						26,704						177,663
Segment income before income taxes						110,142						107,665						5,370						223,177
Segment net income (loss)						$	78,741					$	76,885					$	(5,246)					$	150,380
As of June 30, 2019
Segment assets						$	11,013,898					$	25,001,894					$	6,876,566					$	42,892,358

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($ in thousands)						Consumer and Business Banking						Commercial Banking						Other						Total
Six Months Ended June 30, 2020
Net interest income before provision for credit losses						$	277,517					$	367,297					$	61,668					$	706,482
Provision for credit losses						13,378						162,935						—						176,313
Noninterest income						30,345						66,343						15,998						112,686
Noninterest expense						167,128						135,026						64,418						366,572
Segment income before income taxes						127,356						135,679						13,248						276,283
Segment net income						$	91,253					$	97,309					$	55,614					$	244,176
As of June 30, 2020
Segment assets						$	12,666,938					$	26,984,013					$	9,756,642					$	49,407,593

($ in thousands)						Consumer and Business Banking						Commercial Banking						Other						Total
Six Months Ended June 30, 2019
Net interest income before provision for credit losses						$	365,970					$	311,649					$	52,168					$	729,787
Provision for credit losses						4,629						37,195						—						41,824
Noninterest income						28,275						58,200						8,415						94,890
Noninterest expense						171,562						137,847						55,176						364,585
Segment income before income taxes						218,054						194,807						5,407						418,268
Segment net income						$	155,887					$	139,219					$	19,298					$	314,404
As of June 30, 2019
Segment assets						$	11,013,898					$	25,001,894					$	6,876,566					$	42,892,358

Note 16 — Subsequent Events

On July 23, 2020, the Company’s Board of Directors declared third quarter 2020 cash dividends for the Company’s common stock. The common stock cash dividend of $0.275 per share is payable on August 17, 2020 to stockholders of record as of August 4, 2020.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

									Page
			Overview									64
			Selected Financial Data									67
			Financial Highlights									68
			Results of Operations									70
						Net Interest Income			70
						Noninterest Income			74
						Noninterest Expense			75
						Income Taxes			76
						Operating Segment Results			77
			Balance Sheet Analysis									81
						Selected Consolidated Balance Sheet Data			81
						Debt Securities			82
						Loan Portfolio			85
						Foreign Outstandings			92
						Capital			93
						Deposits and Other Sources of Funds			94
						Regulatory Capital and Ratios			95
			Other Matters									96
			Off-Balance Sheet Arrangements									97
			Risk Management									98
						Credit Risk Management			98
						Liquidity Risk Management			106
						Market Risk Management			109
			Critical Accounting Policies and Estimates									114
			Supplemental Information — Explanation of GAAP to Non-GAAP Financial Measures									114
			Forward-Looking Statements									117

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Overview

The following discussion provides information about the results of operations, financial condition, liquidity and capital resources of East West Bancorp, Inc. (referred to herein on an unconsolidated basis as “East West” and on a consolidated basis as the “Company”, “EWBC” or “we”), and its subsidiaries, including its subsidiary bank, East West Bank and its subsidiaries (referred to herein as “East West Bank” or the “Bank”). This information is intended to facilitate the understanding and assessment of significant changes and trends related to the Company’s results of operations and financial condition. This discussion and analysis should be read in conjunction with the Consolidated Financial Statements and the accompanying notes presented elsewhere in this report, and the Company’s annual report on Form 10-K for the year ended December 31, 2019, filed with the United States (“U.S.”) Securities and Exchange Commission (“SEC”) on February 27, 2020 (the “Company’s 2019 Form 10-K”).

Company Overview

East West is a bank holding company incorporated in Delaware on August 26, 1998 and is registered under the Bank Holding Company Act of 1956, as amended. The Company commenced business on December 30, 1998 when, pursuant to a reorganization, it acquired all of the voting stock of the Bank, which became its principal asset. The Bank is an independent commercial bank headquartered in California that has a strong focus on the financial service needs of the Chinese-American community. Through over 125 locations in the U.S. and Greater China, the Company provides a full range of consumer and commercial products and services through three business segments: Consumer and Business Banking, Commercial Banking, with the remaining operations included in Other. The Company’s principal activity is lending to and accepting deposits from businesses and individuals. The primary source of revenue is net interest income, which is principally derived from the difference between interest earned on loans and debt securities and interest paid on deposits and other funding sources. As of June 30, 2020, the Company had $49.41 billion in assets and approximately 3,200 full-time equivalent employees. For additional information on products and services provided by the Bank, see Item 1. Business — Banking Services of the Company’s 2019 Form 10-K.

Corporate Strategy

We are committed to enhancing long-term shareholder value by executing on the fundamentals of growing loans, deposits and revenue, improving profitability, and investing for the future while managing risk, expenses and capital. Our business model is built on customer loyalty and engagement, understanding of our customers’ financial goals, and meeting our customers’ financial needs through our diverse products and services. The Company’s approach is concentrated on seeking out and deepening client relationships that meet our risk/return measures. This focus guides our decision-making across every aspect of our operations: the products we develop, the expertise we cultivate and the infrastructure we build to help our customers conduct businesses. We expect our relationship-focused business model to continue to generate organic growth and to expand our targeted customer bases. On an ongoing basis, we invest in technology related to critical business infrastructure and streamlining core processes, in the context of maintaining appropriate expense management. Our risk management activities are focused on ensuring that the Company identifies and manages risks to maintain safety and soundness while maximizing profitability.

Coronavirus Disease 2019 Global Pandemic

The Coronavirus Disease 2019 (“COVID-19”) pandemic has caused significant, unprecedented disruption around the world, as well as economic and financial market deterioration, which did not exist at the beginning of the year. The recession resulting from government-mandated closures of certain businesses and “stay-at-home” orders has significantly impacted businesses, investments in those businesses and consumer spending, and heightened volatility in the global financial markets. These economic and operating conditions caused by the COVID-19 pandemic have created financial difficulties for many of the Company’s commercial and consumer customers and, as a result, some borrowers may not be able to satisfy their obligations to us. As many of the Company’s loans are secured by real estate, a potential decline in the real estate markets could also negatively impact the Company’s business, financial condition and the credit quality of the Company’s loan portfolio. As a result of the ongoing COVID-19 pandemic, the provision for credit losses was elevated during the second quarter of 2020.

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Regulatory Developments Relating to COVID-19 Pandemic

Coronavirus Aid, Relief, and Economic Security Act — The Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) was enacted on March 27, 2020 to address the economic impact to individuals and businesses as a result of the COVID-19 pandemic. As part of the CARES Act, various initiatives to protect individuals, businesses and local economies, such as the Small Business Administration (“SBA”) Paycheck Protection Program (“PPP”) and the Main Street Lending Program were established in an effort to lessen the impact of COVID-19 on consumers and businesses. As part of our commitment to support our customers, the Bank participated as a lender in the PPP. During the second quarter of 2020, the Company funded over 7,200 SBA 7(a) approved PPP loans for customers with an outstanding loan balance totaling $1.75 billion as of June 30, 2020. The SBA guarantees 100% of the PPP loans made to eligible borrowers and if used for qualified expenditures, the PPP loans are forgivable. These loans are included in our commercial and industrial (“C&I”) portfolio, have an interest rate of 1% and a maturity of two or five years. The Board of Governors of the Federal Reserve system (“Federal Reserve”) has established the PPP Liquidity Facility (“PPPLF”) to enable Federal Reserve Banks (“FRB”) to extend credit to financial institutions that originate PPP loans, while taking the PPP loans as collateral. As of June 30, 2020, we have drawn down $1.43 billion from the Federal Reserve PPPLF and pledged the same amount in PPP loans as collateral. The Bank is also a participating lender in the Main Street Lending Program, which was established by the Federal Reserve system, to support lending to small and medium-sized businesses and nonprofit organizations that were in sound financial condition before the onset of the COVID-19 pandemic.

In addition, the CARES Act requires mortgage servicers to grant, on a borrower’s request, forbearance for up to 180 days (which can be extended for an additional 180 days) on a federally-backed single-family mortgage loan or forbearance up to 30 days (which can be extended for two additional 30-day periods) on a federally-backed multi-family mortgage loan when the borrowers experience financial hardship due to COVID-19.

Loan Modifications — The CARES Act also includes an option for financial institutions to suspend the U.S. generally accepted accounting principles (“GAAP”) requirements and regulatory determinations for loan modifications related to the COVID-19 pandemic that would otherwise be categorized as a troubled debt restructuring (“TDR”) from March 1, 2020, through the earlier of 60 days after the date of the COVID-19 National Emergency comes to an end or December 31, 2020. On April 7, 2020, the federal banking regulators issued the “Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customer Affected by the Coronavirus (Revised)” (the “Interagency Statement”). The Interagency Statement also provides financial institutions the option to suspend the application of the TDR accounting guidance for short-term modifications (i.e., six months or less) made on a good faith basis in response to COVID-19 to borrowers who were current at the time of modification. Given that nonaccrual loans are more heavily risk-weighted for capital purposes, this TDR relief allows a capital benefit in the form of reduced risk-weighted assets since the aging of such loans were frozen at the time of modification. We are granting loan modifications to our customers in the form of maturity extensions, payment deferrals and forbearance. For a summary of the loans that we have modified in response to COVID-19, please refer to Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations (“MD&A”) — Risk Management — Credit Risk Management in this Form 10-Q.

Regulatory Capital — On March 31, 2020, the U.S. federal banking agencies issued an interim final rule that provided the option to temporarily delay the effects of current expected credit losses (“CECL”) on regulatory capital for two years, followed by a three-year transition period (“CECL Capital Transition”). The Company has elected to apply the CECL Capital Transition during the first quarter of 2020.

Reserve Requirements — On March 26, 2020, the Federal Reserve reduced reserve requirement ratios to zero percent, eliminating the reserve requirement for all depository institutions, an action that provides liquidity in the banking system to support lending to households and businesses.

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Our Response to COVID-19

In response to the COVID-19 pandemic, we have been working diligently to protect employee safety while continuing to carry out our role as a provider of critical and essential services to the public. We have taken comprehensive steps to help our employees, customers and communities as follows:

•Employees:

For employees with jobs that are required to be performed on-site, we have taken significant actions to ensure employee safety by adopting social distancing measures, implementing an enhanced cleaning program and installing plexiglass panels and requiring temperature screenings and the wearing of masks for all employees physically at on-site locations. We have further provided support to our employees by granting an increase in flexibility by temporarily adjusting vacation policies.

•Customers:

We offered assistance to our commercial, consumer and small business clients affected by the COVID-19 pandemic, which includes payment deferrals, pausing foreclosures on certain residential mortgage loans and participation in the SBA PPP and the Main Street Lending Program under the CARES Act as discussed above. We intend to evaluate participation in additional new government-sponsored programs, as they are established.

Given the continuous unprecedented uncertainty and rapidly evolving socioeconomic impacts of the COVID-19 pandemic, the Company continues to closely monitor its impacts on the Company’s business and loan portfolio. The pandemic had a significant impact on the Company’s second quarter and first half of 2020 provision for credit losses. Although we are uncertain of the full magnitude and duration of the business and economic impact from the unprecedented public health efforts to contain and combat the spread of COVID-19, we could experience material declines in revenues, profitability and/or cash flows in one or more periods in 2020, compared to the corresponding prior-year periods and compared to our expectations at the beginning of the 2020 fiscal year. Further discussion of the potential impacts on our business from the COVID-19 pandemic is provided below under Part II, Item 1A - Risk Factors in this Form 10-Q.

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Selected Financial Data

($ and shares in thousands, except per share, ratio and headcount data)						Three Months Ended																														Six Months Ended
									June 30, 2020						March 31, 2020						June 30, 2019						June 30, 2020						June 30, 2019
Summary of operations:
Interest and dividend income (1)						$	398,776					$	449,190					$	474,844					$	847,966					$	938,155
Interest expense						55,001						86,483						107,518						141,484						208,368
Net interest income before provision for credit losses						343,775						362,707						367,326						706,482						729,787
Provision for credit losses						102,443						73,870						19,245						176,313						41,824
Net interest income after provision for credit losses						241,332						288,837						348,081						530,169						687,963
Noninterest income						58,637						54,049						52,759						112,686						94,890
Noninterest expense (2)						187,696						178,876						177,663						366,572						364,585
Income before income taxes						112,273						164,010						223,177						276,283						418,268
Income tax expense (3)						12,921						19,186						72,797						32,107						103,864
Net income (1)(2)(3)						$	99,352					$	144,824					$	150,380					$	244,176					$	314,404
Per common share:
Basic earnings						$	0.70					$	1.00					$	1.03					$	1.71					$	2.16
Diluted earnings						$	0.70					$	1.00					$	1.03					$	1.70					$	2.15
Dividends declared						$	0.28					$	0.28					$	0.28					$	0.55					$	0.51
Book value						$	35.25					$	34.67					$	32.53					$	35.25					$	32.53
Non-GAAP tangible common equity per share (4)						$	31.86					$	31.27					$	29.20					$	31.86					$	29.20
Weighted-average number of shares outstanding:
Basic						141,486						144,814						145,546						143,150						145,402
Diluted						141,827						145,285						146,052						143,560						146,016
Common shares outstanding at period-end						141,486						141,435						145,547						141,486						145,547
At period end:
Total assets						$	49,407,593					$	45,948,545					$	42,892,358					$	49,407,593					$	42,892,358
Total loans						$	37,233,287					$	35,894,987					$	33,734,256					$	37,233,287					$	33,734,256
Available-for-sale (“AFS”) debt securities						$	3,884,574					$	3,695,943					$	2,592,913					$	3,884,574					$	2,592,913
Total deposits						$	40,672,678					$	38,686,958					$	36,477,542					$	40,672,678					$	36,477,542
Long-term debt and finance lease liabilities (5)						$	1,580,442					$	152,162					$	152,506					$	1,580,442					$	152,506
Federal Home Loan Bank (“FHLB”) advances						$	656,759					$	646,336					$	745,074					$	656,759					$	745,074
Stockholders’ equity (6)						$	4,987,243					$	4,902,985					$	4,734,593					$	4,987,243					$	4,734,593
Non-GAAP tangible common equity (4)						$	4,508,056					$	4,422,519					$	4,249,944					$	4,508,056					$	4,249,944
Head count (full-time equivalent)						3,249						3,285						3,261						3,249						3,261
Performance metrics:
Return on average assets (“ROA”)						0.83		%				1.30		%				1.45		%				1.06		%				1.54		%
Return on average equity (“ROE”)						8.02		%				11.60		%				12.88		%				9.82		%				13.75		%
Net interest margin						3.04		%				3.44		%				3.73		%				3.24		%				3.76		%
Efficiency ratio (7)						46.64		%				42.92		%				42.29		%				44.75		%				44.21		%
Non-GAAP efficiency ratio (4)						38.09		%				38.54		%				38.03		%				38.31		%				38.88		%
Credit quality metrics:
Allowance for loan losses						$	632,071					$	557,003					$	330,625					$	632,071					$	330,625
Allowance for loan losses to loans held-for-investment						1.70		%				1.55		%				0.98		%				1.70		%				0.98		%
Nonperforming assets to total assets						0.41		%				0.33		%				0.28		%				0.41		%				0.28		%
Annualized net charge-offs to average loans held-for-investment						0.21		%				0.01		%				0.09		%				0.11		%				0.14		%
Selected metrics:
Total average equity to total average assets						10.33		%				11.22		%				11.28		%				10.76		%				11.21		%
Common dividend payout ratio						39.72		%				27.95		%				26.95		%				32.74		%				23.63		%
Loan-to-deposit ratio						91.54		%				92.78		%				92.48		%				91.54		%				92.48		%
EWBC capital ratios:
Common Equity Tier 1 (“CET1”) capital						12.7		%				12.4		%				12.5		%				12.7		%				12.5		%
Tier 1 capital						12.7		%				12.4		%				12.5		%				12.7		%				12.5		%
Total capital						14.4		%				13.9		%				13.9		%				14.4		%				13.9		%
Tier 1 leverage capital						9.7		%				10.2		%				10.4		%				9.7		%				10.4		%

(1)Includes $21.3 million of interest income related to PPP loans for the second quarter of 2020.

(2)Includes $8.7 million of securities sold under repurchase agreements’ (“repurchase agreements”) extinguishment cost for the second quarter of 2020.

(3)Includes $30.1 million of additional tax expense to reverse certain previously claimed tax credits related to the DC Solar tax credit investments (“DC Solar”) during the second quarter of 2019.

(4)For a discussion of tangible common equity, tangible common equity per share and non-GAAP efficiency ratio, refer to Item 2. MD&A — Supplemental Information — Explanation of GAAP to Non-GAAP Financial Measures in this Form 10-Q.

(5)Includes $1.43 billion of advances from the PPPLF.

(6)On January 1, 2020, the Company adopted Accounting Standards Codification (“ASU”) 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments using the modified retrospective approach. The Company recorded an after-tax decrease to opening retained earnings of $98.0 million as of January 1, 2020.

(7)The efficiency ratio is noninterest expense divided by total revenue (net interest income before provision for credit losses and noninterest income).

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Financial Highlights

Noteworthy items about the Company’s performance for the second quarter and first half of 2020 included:

•Earnings: Second quarter 2020 net income was $99.4 million or $0.70 in diluted earnings per share (“EPS”), compared with second quarter of 2019 net income of $150.4 million or diluted EPS of $1.03, a decrease of $51.0 million or 34% in net income. Net income for the first half of 2020 was $244.2 million or $1.70 in diluted EPS, compared with net income of $314.4 million or $2.15 in diluted EPS for the first half of 2019, a decrease of $70.2 million or 22% in net income. These decreases in both periods were primarily due to higher provision for credit losses resulting from the deteriorating macroeconomic conditions and outlook as a result of the COVID-19 pandemic and the recently adopted CECL methodology, and lower net interest income resulting from lower interest rates, partially offset by a decrease in income tax expense. Provision for credit losses of $176.3 million for the first half of 2020 increased by 322% compared to the same period a year ago.

•Adjusted Earnings: There were no adjustments for non-recurring items during the second quarter and first half of 2020 that affected non-GAAP net income and diluted EPS. Non-GAAP net income and non-GAAP diluted EPS for the second quarter of 2019 were $180.5 million and $1.24, respectively. Non-GAAP net income and non-GAAP diluted EPS for the first half of 2019 were $349.4 million and $2.39, respectively. During the first and second quarters of 2019, the Company recorded a $7.0 million pre-tax impairment charge and reversed $30.1 million of certain previously claimed tax credits related to the DC Solar, respectively. Refer to reconciliations of non-GAAP measures presented under Item 2. MD&A — Supplemental Information — Explanation of GAAP to Non-GAAP Financial Measures in this Form 10-Q.

•Revenue: Revenue, or the sum of net interest income before provision for credit losses and noninterest income, was $402.4 million for the second quarter of 2020, compared with $420.1 million for the second quarter of 2019, a decrease of $17.7 million or 4%. Revenue for the first half of 2020 was $819.2 million, compared with $824.7 million for the first half of 2019, a decrease of $5.5 million or 1%. These decreases were primarily due to lower net interest income, partially offset by an increase in noninterest income.

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•Net Interest Income and Net Interest Margin: Second quarter 2020 net interest income was $343.8 million, compared with second quarter 2019 net interest income of $367.3 million, a decrease of $23.5 million or 6%. Second quarter 2020 net interest margin was 3.04%, a 69 basis point decrease from 3.73% for the second quarter of 2019. Net interest income for the first half of 2020 was $706.5 million, compared with $729.8 million for the first half of 2019, a decrease of $23.3 million or 3%. Net interest margin was 3.24% for the first half of 2020, a decrease of 52 basis points from 3.76% for the first half of 2019. The decreases in the net interest income and net interest margin reflected lower interest rates year-over-year, including a cumulative 225 basis point reduction of the federal funds target rate from the second half of 2019 through the second quarter of 2020.

•Operating Efficiency: Efficiency ratio, calculated as noninterest expense divided by revenue, was 46.64% and 42.29% for the second quarters of 2020 and 2019, respectively. The efficiency ratio was 44.75% for the first half of 2020, compared with 44.21% for the first half of 2019. Adjusting for the amortization of tax credit and other investments, amortization of core deposit intangibles, and repurchase agreements’ extinguishment cost, non-GAAP efficiency ratio for the second quarter of 2020 was 38.09%, a six basis point increase from 38.03% for the second quarter of 2019. For the first half of 2020, non-GAAP efficiency ratio was 38.31%, a 57 basis point improvement from 38.88% for the first half of 2019. For additional detail, see the reconciliations of non-GAAP measures presented under Item 2. MD&A — Supplemental Information — Explanation of GAAP to Non-GAAP Financial Measures in this Form 10-Q.

•Tax: Income tax expense was $12.9 million and the effective tax rate was 11.5% for the second quarter of 2020, compared with income tax expense of $72.8 million and an effective tax rate of 32.6% for the second quarter of 2019. Income tax expense was $32.1 million and the effective tax rate was 11.6% for the first half of 2020, compared with income tax expense of $103.9 million and an effective tax rate of 24.8% for the first half of 2019.

•Profitability: ROA for the second quarters of 2020 and 2019 were 0.83% and 1.45%, respectively. ROA for the first half of 2020 and 2019 were 1.06% and 1.54%, respectively. ROE for the second quarters of 2020 and 2019 were 8.02% and 12.88%, respectively. ROE for the first half of 2020 and 2019 were 9.82% and 13.75%, respectively. Adjusting for non-recurring items related to DC Solar which occurred in 2019, non-GAAP ROA and non-GAAP ROE for the second quarter of 2019 were 1.74% and 15.45%, respectively. Non-GAAP ROA and non-GAAP ROE for the first half of 2019 were 1.71% and 15.28%, respectively. For additional detail, see the reconciliations of non-GAAP measures presented under Item 2. MD&A — Supplemental Information — Explanation of GAAP to Non-GAAP Financial Measures in this Form 10-Q.)

•Loans: Total loans were $37.23 billion as of June 30, 2020, an increase of $2.45 billion or 7% from $34.78 billion as of December 31, 2019. Loan growth was well-diversified across each of the Company’s major loan portfolios, with the strongest growth from C&I, driven by PPP loan funding, commercial real estate (“CRE”) and single-family residential loans.

•Deposits: Total deposits were $40.67 billion as of June 30, 2020, an increase of $3.35 billion or 9% from $37.32 billion as of December 31, 2019. This increase was primarily driven by growth in noninterest-bearing demand deposits and money market accounts, partially offset by a decrease in time deposits.

•Asset Quality Metrics: The allowance for loan losses was $632.1 million or 1.70% of loans held-for-investment, as of June 30, 2020, compared with $358.3 million or 1.03% of loans held-for-investment, as of December 31, 2019. The increase in the allowance for loan losses was primarily due to the deteriorating macroeconomic conditions and outlook as a result of the COVID-19 pandemic; and the adoption of ASU 2016-13, which increased the allowance for loan losses by $125.2 million. Nonperforming assets were $202.2 million or 0.41% of total assets, as of June 30, 2020, an increase from $121.5 million, or 0.27% of total assets, as of December 31, 2019. Second quarter 2020 net charge-offs were $19.2 million, or an annualized 0.21% of average loans held-for-investment, compared with $7.6 million, or an annualized 0.09% of average loans held-for-investment for the second quarter of 2019. For the first half of 2020, net charge-offs were $20.1 million or annualized 0.11% of average loans held-for-investment, compared with $22.1 million or annualized 0.14% of average loans held-for-investment for the first half of 2019.

•Capital Levels: Our capital levels are strong. As of June 30, 2020, all of the Company’s and the Bank’s regulatory capital ratios were well above the regulatory requirements to be considered well-capitalized. See Item 2. MD&A — Balance Sheet Analysis — Regulatory Capital and Ratios in this Form 10-Q for more information regarding capital. On March 3, 2020, the Company’s Board of Directors authorized a stock repurchase program to buy back up to $500.0 million of the Company’s common stock. During the first quarter of 2020, the Company repurchased 4,471,682 shares at an average price of $32.64 per share and a total cost of $146.0 million. There were no share repurchases during the second quarter of 2020 or the full year 2019.

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•Cash Dividends: The quarterly cash common stock dividend for both the second quarters of 2020 and 2019 was $0.275 per share. Cash dividends of $39.5 million during the second quarter of 2020 and $79.9 million the first half of 2020 were retuned to stockholders, compared with $40.5 million and $74.3 million during the same periods in 2019, respectively.

Results of Operations

Net Interest Income

The Company’s primary source of revenue is net interest income, which is the interest income earned on interest-earning assets less interest expense paid on interest-bearing liabilities. Net interest margin is the ratio of net interest income to average interest-earning assets. Net interest income and net interest margin are impacted by several factors, including changes in average balances and composition of interest-earning assets and funding sources, market interest rate fluctuations and the slope of the yield curve, repricing characteristics and maturity of interest-earning assets and interest-bearing liabilities, volume of noninterest-bearing sources of funds, and asset quality.

Second quarter 2020 net interest income was $343.8 million, a decrease of $23.5 million or 6%, compared with $367.3 million for the second quarter of 2019. For the first half of 2020, net interest income was $706.5 million, a decrease of $23.3 million or 3%, compared with $729.8 million for the first half of 2019. The decreases in net interest income were due to a decrease in interest-earning asset yields which reflected the drop in the average Prime and London Interbank Offered Rates (“LIBOR”), partially offset by decreases in the cost of funds. Second quarter 2020 net interest margin was 3.04%, a 69 basis point decrease from 3.73% for the second quarter of 2019. For the first half of 2020, net interest margin was 3.24%, a 52 basis point decrease from 3.76% for the first half of 2019.

The average loan yield for the second quarter of 2020 was 3.98%, a 130 basis point decrease from 5.28% for the second quarter of 2019. For the first half of 2020, the average loan yield was 4.34%, a 95 basis point decrease from 5.29% for the first half of 2019. These decreases, compared with the same periods in 2019, reflected materially lower interest rates, which resulted from a cumulative 225 basis point reduction of the federal funds target rate. Approximately 65% and 70% of loans were comprised of variable-rate or hybrid loans that were in the adjustable rate period as of June 30, 2020 and 2019, respectively. Second quarter of 2020 average loans were $37.14 billion, an increase of $4.16 billion or 13% from $32.98 billion for the second quarter of 2019. For the first half of 2020, average loans were $36.15 billion, an increase of $3.45 billion or 11% from $32.70 billion for the first half of 2019. The year-over-year increase stemmed from broad-based growth across CRE, C&I, and single-family residential loans.

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Second quarter of 2020 average interest-earning assets was $45.41 billion, an increase of $5.95 billion or 15% from $39.46 billion for the second quarter of 2019. This was primarily due to increases of $4.16 billion in average loans and $1.17 billion in AFS debt securities. For the first half of 2020, average interest-earning assets was $43.89 billion, an increase of $4.78 billion or 12% from $39.11 billion for first half of 2019. This was primarily due to increases of $3.45 billion in average loans and $900.4 million in AFS debt securities.

Deposits are an important source of funds and impact both net interest income and net interest margin. Average noninterest-bearing demand deposits totaled $13.53 billion for the second quarter of 2020, compared with $10.24 billion for the second quarter of 2019, an increase of $3.29 billion or 32%. Average noninterest-bearing demand deposits comprised 34% and 29% of average total deposits for the second quarters of 2020 and 2019, respectively. Average noninterest-bearing demand deposits was $12.33 billion for the first half of 2020, compared with $10.16 billion for the first half of 2019, an increase of $2.17 billion or 21%. Average noninterest-bearing demand deposits made up 32% and 29% of average total deposits for first half of 2020 and 2019, respectively. Average interest-bearing deposits of $26.37 billion for the second quarter of 2020 increased by $1.28 billion or 5% from $25.09 billion for the second quarter of 2019. Average interest-bearing deposits of $26.36 billion for the first half of 2020 increased by $1.39 billion or 6%, from $24.97 billion for the first half of 2019.

The average cost of funds was 0.53% for the second quarter of 2020, a decrease of 66 basis points from 1.19% for the second quarter of 2019. For the first half of 2020, the average cost of funds was 0.71%, a decrease of 46 basis points from 1.17% for the first half of 2019. The decreases in the average cost of funds reflected the cumulative 225 basis point reduction of the target federal funds rate from the second half of 2019 through the second quarter of 2020. The average cost of deposits was 0.47% for the second quarter of 2020, a decrease of 64 basis points from 1.11% for the second quarter of 2019. The average cost of deposits was 0.64% for the first half of 2020, a decrease of 45 basis points from 1.09% for the first half of 2019.

The average cost of interest-bearing deposits was 0.71% for the second quarter of 2020, a decrease of 86 basis points from 1.57% for the second quarter of 2019. For the first half of 2020, the average cost of interest-bearing deposits decreased 59 basis points to 0.94%, from 1.53% for the first half of 2019. Other sources of funding included in the calculation of the average cost of funds consist of short-term borrowings, FHLB advances, repurchase agreements and long-term debt.

The Company utilizes various tools to manage interest rate risk. Refer to Item 2. MD&A — Risk Management — Market Risk Management in this Form 10-Q.

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The following table presents the interest spread, net interest margin, average balances, interest income and expense, and the average yield/rate by asset and liability component for the second quarters of 2020 and 2019:

($ in thousands)						Three Months Ended June 30,
									2020																														2019
									Average Balance						Interest						Average Yield/ Rate (1)						Average Balance						Interest						Average Yield/ Rate (1)
ASSETS
Interest-earning assets:
Interest-bearing cash and deposits with banks						$	3,435,920					$	4,564					0.53		%				$	2,852,060					$	16,800					2.37		%
Securities purchased under resale agreements (“Resale agreements”) (2)						1,037,473						5,514						2.14		%				999,835						7,404						2.98		%
AFS debt securities (3)(4)						3,719,209						21,004						2.27		%				2,551,383						15,685						2.47		%
Loans (5)(6)						37,141,773						367,393						3.98		%				32,981,374						434,450						5.28		%
Restricted equity securities						78,867						301						1.54		%				76,449						505						2.65		%
Total interest-earning assets						$	45,413,242					$	398,776					3.53		%				$	39,461,101					$	474,844					4.83		%
Noninterest-earning assets:
Cash and due from banks						498,908																		439,449
Allowance for loan losses						(566,473)																		(321,335)
Other assets						2,883,237																		1,966,226
Total assets						$	48,228,914																	$	41,545,441
LIABILITIES AND STOCKHOLDERS’ EQUITY
Interest-bearing liabilities:
Checking deposits						$	4,687,178					$	5,404					0.46		%				$	5,221,110					$	15,836					1.22		%
Money market deposits						9,893,816						8,093						0.33		%				7,856,055						28,681						1.46		%
Savings deposits						2,149,965						1,445						0.27		%				2,106,626						2,477						0.47		%
Time deposits						9,634,696						31,457						1.31		%				9,904,726						50,970						2.06		%
Short-term borrowings						242,185						265						0.44		%				35,575						361						4.07		%
FHLB advances						653,665						3,343						2.06		%				533,841						4,011						3.01		%
Repurchase agreements (2)						418,681						3,540						3.40		%				50,000						3,469						27.83		%
Long-term debt and finance lease liabilities						682,432						1,454						0.86		%				152,608						1,713						4.50		%
Total interest-bearing liabilities						$	28,362,618					$	55,001					0.78		%				$	25,860,541					$	107,518					1.67		%
Noninterest-bearing liabilities and stockholders’ equity:
Demand deposits						13,534,873																		10,237,868
Accrued expenses and other liabilities						1,348,977																		762,684
Stockholders’ equity						4,982,446																		4,684,348
Total liabilities and stockholders’ equity						$	48,228,914																	$	41,545,441
Interest rate spread																		2.75		%																3.16		%
Net interest income and net interest margin												$	343,775					3.04		%										$	367,326					3.73		%

(1)Annualized.

(2)There was no netting of repurchase agreements against resale agreements for the second quarter of 2020. Average balances of resale and repurchase agreements for the three months ended June 30, 2019 have been reported net, pursuant to Accounting Standards Codification (“ASC”) 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements. The weighted-average yields of gross resale agreements were 2.14% and 2.71% for the second quarters of 2020 and 2019, respectively. The weighted-average interest rates of gross repurchase agreements were 3.40% and 4.93% for the second quarters of 2020 and 2019, respectively.

(3)Yields on tax-exempt securities are not presented on a tax-equivalent basis.

(4)Includes the amortization of premiums on debt securities of $5.9 million and $2.9 million for the second quarters of 2020 and 2019, respectively.

(5)Average balances include nonperforming loans and loans held-for-sale.

(6)Loans include the accretion of net deferred loan fees, unearned fees and amortization of premiums, which totaled $21.1 million and $8.8 million for the second quarters of 2020 and 2019, respectively.

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The following table presents the interest spread, net interest margin, average balances, interest income and expense, and the average yield/rate by asset and liability component for the first half of 2020 and 2019:

($ in thousands)						Six Months Ended June 30,
									2020																														2019
									Average Balance						Interest						Average Yield/ Rate (1)						Average Balance						Interest						Average Yield/ Rate (1)
ASSETS
Interest-earning assets:
Interest-bearing cash and deposits with banks						$	3,204,463					$	15,672					0.98		%				$	2,716,128					$	32,210					2.38		%
Resale agreements (2)						959,807						11,139						2.33		%				1,017,320						15,310						3.03		%
AFS debt securities (3)(4)						3,496,974						41,146						2.37		%				2,596,590						31,433						2.44		%
Loans (5)(6)						36,147,871						779,262						4.34		%				32,699,644						857,984						5.29		%
Restricted equity securities						78,771						747						1.91		%				75,348						1,218						3.26		%
Total interest-earning assets						$	43,887,886					$	847,966					3.89		%				$	39,105,030					$	938,155					4.84		%
Noninterest-earning assets:
Cash and due from banks						504,710																		453,725
Allowance for loan losses						(529,385)																		(317,909)
Other assets						2,629,000																		1,903,306
Total assets						$	46,492,211																	$	41,144,152
LIABILITIES AND STOCKHOLDERS’ EQUITY
Interest-bearing liabilities:
Checking deposits						$	4,844,425					$	15,650					0.65		%				$	5,245,845					$	30,091					1.16		%
Money market deposits						9,453,599						30,341						0.65		%				7,967,831						58,915						1.49		%
Savings deposits						2,113,118						3,262						0.31		%				2,099,058						4,704						0.45		%
Time deposits						9,949,351						73,549						1.49		%				9,658,181						96,259						2.01		%
Short-term borrowings						151,081						821						1.09		%				47,939						977						4.11		%
FHLB advances						673,511						7,509						2.24		%				436,475						6,990						3.23		%
Repurchase agreements (2)						375,549						7,531						4.03		%				50,000						6,961						28.07		%
Long-term debt and finance lease liabilities						417,345						2,821						1.36		%				152,485						3,471						4.59		%
Total interest-bearing liabilities						$	27,977,979					$	141,484					1.02		%				$	25,657,814					$	208,368					1.64		%
Noninterest-bearing liabilities and stockholders’ equity:
Demand deposits						12,326,291																		10,155,079
Accrued expenses and other liabilities						1,185,715																		720,028
Stockholders’ equity						5,002,226																		4,611,231
Total liabilities and stockholders’ equity						$	46,492,211																	$	41,144,152
Interest rate spread																		2.87		%																3.20		%
Net interest income and net interest margin												$	706,482					3.24		%										$	729,787					3.76		%

(1)Annualized.

(2)Average balances of resale and repurchase agreements have been reported net, pursuant to ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements. The weighted-average yields of gross resale agreements were 2.32% and 2.77% for the first half of 2020 and 2019, respectively. The weighted-average interest rates of gross repurchase agreements were 3.76% and 4.97% for the first half of 2020 and 2019, respectively.

(3)Yields on tax-exempt securities are not presented on a tax-equivalent basis.

(4)Includes the amortization of premiums on debt securities of $9.2 million and $6.0 million for the first half of 2020 and 2019, respectively.

(5)Average balances include nonperforming loans and loans held-for-sale.

(6)Loans include the accretion of net deferred loan fees, unearned fees and amortization of premiums, which totaled $29.1 million and $16.8 million for the first half of 2020 and 2019, respectively.

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The following table summarizes the extent to which changes in (1) interest rates; and (2) average interest-earning assets and average interest-bearing liabilities affected the Company’s net interest income for the periods presented. The total change for each category of interest-earning assets and interest-bearing liabilities is segmented into changes attributable to variations in volume and interest rates. Changes that are not solely due to either volume or rate are allocated proportionally based on the absolute value of the change related to average volume and average rate.

($ in thousands)						Three Months Ended June 30,																														Six Months Ended June 30,
									2020 vs. 2019																														2020 vs. 2019
									Total Change						Changes Due to																		Total Change						Changes Due to
																		Volume						Yield/Rate															Volume						Yield/Rate
Interest-earning assets:
Interest-bearing cash and deposits with banks						$	(12,236)					$	2,882					$	(15,118)					$	(16,538)					$	4,994					$	(21,532)
Resale agreements						(1,890)						269						(2,159)						(4,171)						(826)						(3,345)
AFS debt securities						5,319						6,642						(1,323)						9,713						10,702						(989)
Loans						(67,057)						49,689						(116,746)						(78,722)						85,564						(164,286)
Restricted equity securities						(204)						15						(219)						(471)						54						(525)
Total interest and dividend income						$	(76,068)					$	59,497					$	(135,565)					$	(90,189)					$	100,488					$	(190,677)
Interest-bearing liabilities:
Checking deposits						$	(10,432)					$	(1,479)					$	(8,953)					$	(14,441)					$	(2,146)					$	(12,295)
Money market deposits						(20,588)						5,958						(26,546)						(28,574)						9,511						(38,085)
Savings deposits						(1,032)						50						(1,082)						(1,442)						32						(1,474)
Time deposits						(19,513)						(1,360)						(18,153)						(22,710)						2,859						(25,569)
Short-term borrowings						(96)						473						(569)						(156)						956						(1,112)
FHLB advances						(668)						775						(1,443)						519						3,074						(2,555)
Repurchase agreements						71						5,491						(5,420)						570						11,069						(10,499)
Long-term debt and finance lease liabilities						(259)						2,033						(2,292)						(650)						3,024						(3,674)
Total interest expense						$	(52,517)					$	11,941					$	(64,458)					$	(66,884)					$	28,379					$	(95,263)
Change in net interest income						$	(23,551)					$	47,556					$	(71,107)					$	(23,305)					$	72,109					$	(95,414)

Noninterest Income

The following table presents the components of noninterest income for the second quarter and first half of 2020 and 2019:

($ in thousands)						Three Months Ended June 30,																														Six Months Ended June 30,
									2020						2019						% Change						2020						2019						% Change
Lending fees						$	21,946					$	16,423					34		%				$	37,719					$	31,392					20		%
Deposit account fees						10,872						9,607						13		%				21,319						19,075						12		%
Foreign exchange income						4,562						7,286						(37)		%				12,381						12,301						1		%
Wealth management fees						3,091						3,800						(19)		%				8,444						7,574						11		%
Interest rate contracts and other derivative income						6,107						10,398						(41)		%				13,180						13,614						(3)		%
Net gains on sales of loans						132						15						780		%				1,082						930						16		%
Gains on sales of AFS debt securities						9,640						1,447						566		%				11,169						3,008						271		%
Other investment income						966						706						37		%				2,887						1,908						51		%
Other income						1,321						3,077						(57)		%				4,505						5,088						(11)		%
Total noninterest income						$	58,637					$	52,759					11		%				$	112,686					$	94,890					19		%

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Noninterest income comprised 15% and 14% of total revenue for the second quarter and the first half of 2020, respectively, compared with 13% and 12% for the second quarter and the first half of 2019, respectively. Second quarter 2020 noninterest income was $58.6 million, an increase of $5.9 million or 11%, compared with $52.8 million for the same period in 2019. This increase was primarily due to increases in gains on sale of AFS debt securities and lending fees, partially offset by decreases in interest rate contracts and other derivative income, foreign exchange income and other income. First half 2020 noninterest income was $112.7 million, an increase of $17.8 million or 19%, compared with $94.9 million for the first half of 2019. This increase was primarily due to increases in gains on sale of AFS debt securities and lending fees, partially offset by decreases in other income and interest rate contracts and other derivative income. The following discussion provides the composition of the major changes in noninterest income:

Lending fees increased by $5.5 million or 34% to $21.9 million for the second quarter of 2020, and increased by $6.3 million or 20% to $37.7 million for the first half of 2020, as compared with the same periods in 2019. These increases primarily reflected an increase in the valuation of warrants received as part of lending relationships.

Foreign exchange income decreased by $2.7 million or 37% to $4.6 million for the second quarter of 2020, and was essentially flat at $12.4 million for the first half of 2020, as compared with the same periods in 2019. The decrease in the second quarter of 2020 was primarily driven by the unfavorable revaluation of certain foreign currency-denominated balance sheet items and a decrease in customer-driven transactions.

Interest rate contracts and other derivative income decreased $4.3 million or 41% to $6.1 million for the second quarter of 2020, and decreased by $434 thousand or 3% to $13.2 million for the first half of 2020, as compared with the same periods in 2019. These decreases primarily reflected the impact of negative credit valuation adjustments due to higher loss probabilities for borrowers impacted by COVID-19.

Gains on sales of AFS debt securities increased by $8.2 million or 566% to $9.6 million for the second quarter of 2020, and increased by $8.2 million or 271% to $11.2 million for the first half of 2020, as compared with the same periods in 2019. These increases were primarily driven by $131.6 million in sales of municipal bonds during the second quarter of 2020.

Other income decreased by $1.8 million or 57% to $1.3 million for the second quarter of 2020, and decreased by $583 thousand or 11% to $4.5 million for the first half of 2020, as compared with the same periods in 2019. These decreases primarily reflected losses recognized on the cash surrender value of bank-owned life insurance policies.

Noninterest Expense

The following table presents the components of noninterest expense for the second quarters and first half of 2020 and 2019:

($ in thousands)						Three Months Ended June 30,																														Six Months Ended June 30,
									2020						2019						% Change						2020						2019						% Change
Compensation and employee benefits						$	96,955					$	100,531					(4)		%				$	198,915					$	202,830					(2)		%
Occupancy and equipment expense						16,217						17,362						(7)		%				33,293						34,680						(4)		%
Deposit insurance premiums and regulatory assessments						3,700						2,919						27		%				7,127						6,007						19		%
Legal expense						1,530						2,355						(35)		%				4,727						4,580						3		%
Data processing						4,480						3,460						29		%				8,306						6,617						26		%
Consulting expense						1,413						2,069						(32)		%				2,630						4,128						(36)		%
Deposit related expense						3,353						3,338						0		%				6,916						6,842						1		%
Computer software expense						7,301						6,211						18		%				13,467						12,289						10		%
Other operating expense						19,248						22,679						(15)		%				40,367						44,968						(10)		%
Amortization of tax credit and other investments						24,759						16,739						48		%				42,084						41,644						1		%
Repurchase agreements’ extinguishment cost						8,740						—						100		%				8,740						—						100		%
Total noninterest expense						$	187,696					$	177,663					6		%				$	366,572					$	364,585					1		%

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Second quarter 2020 noninterest expense was $187.7 million, an increase of $10.0 million or 6%, compared with $177.7 million for the same period in 2019. This increase was primarily due to repurchase agreements’ extinguishment cost and the amortization of tax credit and other investments, partially offset by decreases in compensation and employee benefits and other operating expenses. First half 2020 noninterest expense was $366.6 million, an increase of $2.0 million or 1%, compared with $364.6 million for the first half of 2019. This increase was primarily due to repurchase agreements’ extinguishment cost and additional data processing expense, partially offset by decreases in other operating expenses and compensation and employee benefits.

Compensation and employee benefits decreased by $3.6 million or 4% to $97.0 million for the second quarter of 2020, and decreased by $3.9 million or 2% to $198.9 million for the first half of 2020, as compared with the same periods in 2019. These decreases were primarily driven by increased deferred loan costs as a result of increased loan originations and a reduction in bonus accruals, partially offset by annual merit increases and greater temporary staffing costs.

Data processing increased by $1.0 million or 29% to $4.5 million for the second quarter of 2020, and increased by $1.7 million or 26% to $8.3 million for the first half of 2020, as compared with the same periods in 2019. These increases were primarily driven by an increase in electronic data processing fees.

Other operating expense primarily consists of telecommunications and postage, loan related expenses, charitable contributions, marketing, travel, and other miscellaneous expense categories. Other operating expense decreased by $3.4 million or 15% to $19.2 million for the second quarter of 2020, and decreased by $4.6 million or 10% to $40.4 million for the first half of 2020, as compared with the same periods in the 2019. These decreases were primarily driven by decreases in travel, marketing and other miscellaneous expense categories, largely due to COVID-19.

Amortization of tax credit and other investments increased $8.0 million or 48% to $24.8 million for the second quarter of 2020, compared with the second quarter of 2019, and increased by $440 thousand or 1% to $42.1 million for the first half of 2020, as compared with the same periods in 2019. These increases were mainly attributable to a reduction in value for investments accounted for under the equity method and an increase in amortization expense from tax credit investments placed in service in 2020, partially offset by a decrease in impairment charges. In the first quarter of 2019, the Company fully wrote off the tax credit investments related to DC Solar and recorded a $7.0 million impairment charge. In the second quarter of 2019, the Company recorded $2.9 million of other-than-temporary impairment (“OTTI”) charges related to a historic tax credit investment and a Community Reinvestment Act investment. In comparison, $624 thousand and $474 thousand of impairment charges net of recoveries were recorded in the second quarter and first half of 2020, respectively.

During the second quarter of 2020, the Company prepaid $150.0 million of repurchase agreements and incurred a debt extinguishment cost of $8.7 million. No such expense was incurred in the second quarter and first half of 2019.

Income Taxes

($ in thousands)						Three Months Ended June 30,																														Six Months Ended June 30,
									2020						2019						% Change						2020						2019						% Change
Income before income taxes						$	112,273					$	223,177					(50)		%				$	276,283					$	418,268					(34)		%
Income tax expense						$	12,921					$	72,797					(82		%)				$	32,107					$	103,864					(69		%)
Effective tax rate						11.5		%				32.6		%				(65		%)				11.6		%				24.8		%				(53		%)

The income tax expense was $12.9 million and the effective tax rate was 11.5% in the second quarter of 2020, compared with an income tax expense of $72.8 million and an effective tax rate of 32.6% for the same period in 2019. The income tax expense was $32.1 million and the effective tax rate was 11.6% in the first half of 2020, compared with an income tax expense of $103.9 million and an effective tax rate of 24.8% for the same period in 2019. The higher effective tax rates of 32.6% and 24.8% during the second quarter and first half of 2019, respectively, were primarily due to $30.1 million of additional income tax expense recorded to reverse certain previously claimed tax credits related to the Company’s investment in DC Solar. Excluding this $30.1 million of additional income tax expense, non-GAAP effective tax rates for the second quarter and first half of 2019 were 19.1% and 17.6%, respectively. For more details, see reconciliations of non-GAAP measures presented under Item 2. MD&A — Supplemental Information — Explanation of GAAP to Non-GAAP Financial Measures in this Form 10-Q. The year-over-year decrease in the effective tax rate was primarily due to the decreases in pre-tax income during the second quarter and first half of 2020, as compared with the same periods of 2019, combined with a year-over-year increase in tax credits recognized from investments in renewable energy and solar tax credit projects.

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Operating Segment Results

The Company organizes its operations into three reportable operating segments: (1) Consumer and Business Banking; (2) Commercial Banking; and (3) Other. These segments are defined by the type of customers served and the related products and services provided. The segments reflect how financial information is currently evaluated by management. For additional description of the Company’s internal management reporting process, including the segment cost allocation methodology, see Note 15 — Business Segments to the Consolidated Financial Statements in this Form 10-Q.

Net interest income before provision for credit losses of each segment represents the difference between actual interest income earned on loans and interest expense paid on customer deposits of the segment, adjusted for funding charges for loans or funding credits for deposits through the Company’s internal funds transfer pricing (“FTP”) process. During the third quarter of 2019, the Company enhanced its FTP methodology related to deposits by setting a minimum floor rate for the FTP credits for deposits in consideration of the flattened and inverted yield curve. This methodology has been retrospectively applied to the segment financial results for the second quarter and first half of 2019.

The following tables present selected segment information for the second quarter and first half of 2020 and 2019:

($ in thousands)						Three Months Ended June 30, 2020
									Consumer and Business Banking						Commercial Banking						Other						Total
Net interest income before provision for credit losses						$	124,926					$	183,796					$	35,053					$	343,775
Provision for credit losses						5,590						96,853						—						102,443
Noninterest income						13,943						33,887						10,807						58,637
Noninterest expense						80,164						64,900						42,632						187,696
Segment income before income taxes						53,115						55,930						3,228						112,273
Segment net income						$	38,058					$	40,178					$	21,116					$	99,352
Average loans						$	12,011,203					$	25,130,570					$	—					$	37,141,773
Average deposits						$	27,004,689					$	10,642,686					$	2,253,153					$	39,900,528

($ in thousands)						Three Months Ended June 30, 2019
									Consumer and Business Banking						Commercial Banking						Other						Total
Net interest income before provision for credit losses						$	180,911					$	158,941					$	27,474					$	367,326
Provision for credit losses						1,616						17,629						—						19,245
Noninterest income						14,503						33,656						4,600						52,759
Noninterest expense						83,656						67,303						26,704						177,663
Segment income before income taxes						110,142						107,665						5,370						223,177
Segment net income (loss)						$	78,741					$	76,885					$	(5,246)					$	150,380
Average loans						$	10,529,143					$	22,452,231					$	—					$	32,981,374
Average deposits						$	25,010,526					$	8,350,204					$	1,965,655					$	35,326,385

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($ in thousands)						Six Months Ended June 30, 2020
									Consumer and Business Banking						Commercial Banking						Other						Total
Net interest income before provision for credit losses						$	277,517					$	367,297					$	61,668					$	706,482
Provision for credit losses						13,378						162,935						—						176,313
Noninterest income						30,345						66,343						15,998						112,686
Noninterest expense						167,128						135,026						64,418						366,572
Segment income before income taxes						127,356						135,679						13,248						276,283
Segment net income						$	91,253					$	97,309					$	55,614					$	244,176
Average loans						$	11,640,346					$	24,507,525					$	—					$	36,147,871
Average deposits						$	26,298,876					$	9,909,058					$	2,478,850					$	38,686,784

($ in thousands)						Six Months Ended June 30, 2019
									Consumer and Business Banking						Commercial Banking						Other						Total
Net interest income before provision for credit losses						$	365,970					$	311,649					$	52,168					$	729,787
Provision for credit losses						4,629						37,195						—						41,824
Noninterest income						28,275						58,200						8,415						94,890
Noninterest expense						171,562						137,847						55,176						364,585
Segment income before income taxes						218,054						194,807						5,407						418,268
Segment net income						$	155,887					$	139,219					$	19,298					$	314,404
Average loans						$	10,440,946					$	22,258,698					$	—					$	32,699,644
Average deposits						$	25,029,425					$	8,186,361					$	1,910,208					$	35,125,994

Consumer and Business Banking

The Consumer and Business Banking segment primarily provides financial products and services to consumer and commercial customers through the Company’s domestic branch network. This segment offers consumer and commercial deposits, mortgage and home equity loans, and other products and services. It also originates commercial loans for small and medium-sized enterprises through the Company’s branch network. Other products and services provided by this segment include wealth management, treasury management and foreign exchange services.

The Consumer and Business Banking segment reported net income of $38.1 million for the second quarter of 2020, compared with $78.7 million for the same period in 2019. The decrease in segment net income of $40.6 million or 52% was primarily due to a decrease in net interest income before provision for credit losses.

Second quarter 2020 net interest income before provision for credit losses for this segment was $124.9 million, a decrease of $56.0 million or 31%, compared with $180.9 million for the same period in 2019. Interest income earned on loans decreased by 3%, driven by a decrease in average loan yields, partially offset by average loan growth; interest expense paid on deposits decreased by 52%, driven by a decline in the average cost of deposits; FTP funding charges assessed for loans decreased, reflecting a decline in the loans FTP rate, and FTP credits received for deposits also decreased, reflecting a decline in the deposits FTP rate. Combined, these factors contributed to a 31% decrease in segment net interest income before provision for credit losses, with the largest driver of the unfavorable result being lower FTP credits received for deposits.

Second quarter 2020 average loans for this segment were $12.01 billion, an increase of $1.48 billion or 14% from $10.53 billion for the same period in 2019, primarily driven by an increase in single-family residential portfolio. Second quarter 2020 average deposits for this segment were $27.00 billion, an increase of $1.99 billion or 8% from $25.01 billion for the same period in 2019, primarily driven by increases in noninterest-bearing demand and money market deposits.

The Consumer and Business Banking segment reported net income of $91.3 million for the first half of 2020, compared with $155.9 million for the same period in 2019. The decrease in segment net income of $64.6 million or 41% was primarily due to a decrease in net interest income before provision for credit losses.

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First half 2020 net interest income before provision for credit losses for this segment was $277.5 million, a decrease of $88.5 million or 24%, compared with $366.0 million for the same period in 2019. Interest income earned on loans remained relatively flat; interest expense paid on deposits decreased by 36%, driven by a decline in the average cost of deposits; FTP funding charges assessed for loans decreased, reflecting a decline in the loans FTP rate, and FTP credits received for deposits also decreased, reflecting a decline in the deposits FTP rate. Combined, these factors drove a 24% decrease in segment net interest income before provision for credit losses, with the largest driver of the unfavorable result being lower FTP credits received for deposits.

First half 2020 average loans for this segment were $11.64 billion, an increase of $1.20 billion or 11% from $10.44 billion for the same period in 2019, primarily driven by an increase in single-family residential portfolio. First half 2020 average deposits for this segment were $26.30 billion, an increase of $1.27 billion or 5% from $25.03 billion for the same period in 2019, primarily driven by increases in noninterest-bearing demand and money market deposits.

Commercial Banking

The Commercial Banking segment primarily generates commercial loans and deposits. Commercial loan products include commercial business loans and lines of credit, trade finance loans and letters of credit, CRE loans, construction and land lending, affordable housing loans and letters of credit, asset-based lending, and equipment financing. Commercial deposit products and other financial services include treasury management, foreign exchange services, and interest rate and commodity risk hedging.

The Commercial Banking segment reported segment net income of $40.2 million for the second quarter of 2020, compared with $76.9 million for the same period in 2019. The decrease in segment net income of $36.7 million or 48% reflected an increase in provision for credit losses, partially offset by an increase in net interest income before provision for credit losses. Second quarter 2020 provision for credit losses was $96.9 million, an increase of $79.3 million or 449%, compared with $17.6 million for the same period in 2019. This increase was primarily due to deteriorating macroeconomic conditions and outlook as a result of the COVID-19 pandemic, as well as due to loan risk rating downgrades.

Second quarter 2020 net interest income before provision for credit losses for this segment was $183.8 million, an increase of $24.9 million or 16% compared with $158.9 million for the same period in 2019. Interest income earned on loans decreased by 21%, driven by a decrease in average loan yields, which more than offset the income growth driven by the average loan growth; interest expense paid on deposits decreased by 46%, driven by a decline in the average cost of deposits; FTP funding charges assessed for loans decreased, reflecting a decline in the FTP rate on loans, and FTP credits received for deposits also decreased, reflecting a decline in the FTP rate on deposits. Combined, these factors contributed to an increase of 16% in segment net interest income before provision for credit losses, which were primarily driven by lower FTP funding charges assessed for loans.

Second quarter 2020 average loans for this segment were $25.13 billion, an increase of $2.68 billion or 12% from $22.45 billion for the same period in 2019, primarily driven by the growth in CRE and C&I loan portfolios. Second quarter 2020 average deposits were $10.64 billion, an increase of $2.29 billion or 27% from $8.35 billion for the same period in 2019, primarily driven by an increase in noninterest-bearing demand deposits.

The Commercial Banking segment reported segment net income of $97.3 million for the first half of 2020, compared with $139.2 million for the same period in 2019. The decrease in segment net income of $41.9 million or 30% reflected an increase in provision for credit losses, partially offset by increases in net interest income before provision for credit losses and noninterest income. First half 2020 provision for credit losses was $162.9 million, an increase of $125.7 million or 338%, compared with $37.2 million for the same period in 2019. This increase was primarily due to deteriorating macroeconomic conditions and outlook as a result of the COVID-19 pandemic, as well as due to loan risk rating downgrades.

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First half 2020 net interest income before provision for credit losses for this segment was $367.3 million, an increase of $55.7 million or 18% compared with $311.6 million for the same period in 2019. Interest income earned on loans decreased by 13%, which was primarily attributable to a decrease in average loan yields, which more than offset income growth driven by average loan growth; interest expense paid on deposits decreased by 31%, driven by a decline in the average cost of deposits; FTP funding charges assessed for loans decreased, reflecting a decline in the FTP rate on loans; FTP credits received for deposits also decreased, reflecting a decline in the FTP rate on deposits. Combined, these factors drove an increase of 18% in segment net interest income before provision for credit losses, which were primarily driven by lower FTP funding charges assessed for loans. First half 2020 noninterest income was $66.3 million, an increase of $8.1 million or 14%, compared with $58.2 million for the same period in 2019. This increase was mainly attributable to an increase in the valuation of warrants received as part of lending relationships.

First half 2020 average loans for this segment were $24.51 billion, an increase of $2.25 billion or 10% from $22.26 billion for the same period in 2019, primarily driven by the growth in CRE and C&I loan portfolios. First half 2020 average deposits for this segment were $9.91 billion, an increase of $1.72 billion or 21% from $8.19 billion for the same period in 2019, primarily driven by increases in noninterest-bearing demand and time deposits.

Other

Centralized functions, including the corporate treasury activities of the Company and eliminations of inter-segment amounts, have been aggregated and included in the Other segment, which provides broad administrative support to the two core segments, namely the Consumer and Business Banking and the Commercial Banking segments.

The Other segment reported segment income before income taxes of $3.2 million and segment net income of $21.1 million for the second quarter of 2020, reflecting an income tax benefit of $17.9 million. In comparison, the Other segment reported segment income before income taxes of $5.4 million and segment net loss of $5.2 million for the second quarter of 2019, reflecting an income tax expense of $10.6 million.

The decrease in second quarter 2020 segment income before income taxes was primarily driven by an increase in noninterest expense, partially offset by increases in net interest income before provision for credit losses and noninterest income. Noninterest expense was $42.6 million, an increase of $15.9 million or 60%, compared with $26.7 million for the same period in 2019. The increase was mainly attributable to a reduction in value for investments accounted for under the equity method and an increase in amortization expense from tax credit investments placed in service in 2020. In addition, the Company prepaid $150.0 million of repurchase agreements and incurred a debt extinguishment cost of $8.7 million during the second quarter of 2020. Second quarter 2020 net interest income before provision for credit losses was $35.1 million, an increase of $7.6 million or 28%, compared with $27.5 million for the same period in 2019. The increase mainly reflected a 67% decrease in interest expense paid on deposits, driven by a decline in average cost of deposits and an increase in FTP net spread. FTP net spread is the difference between the total internal FTP charges and credits and is recorded as part of net interest income in the Other segment. The favorable impact on net interest income before provision for credit losses was partially offset by a decrease in interest income on investment. Second quarter 2020 noninterest income was $10.8 million, an increase of $6.2 million or 135%, compared with $4.6 million for the same period in 2019, driven by an increase in gains on sales of municipal bonds during the second quarter of 2020.

The Other segment reported segment income before income taxes of $13.2 million and segment net income of $55.6 million for the first half of 2020, reflecting an income tax benefit of $42.4 million. In comparison, the Other segment reported segment income before income taxes of $5.4 million and segment net income of $19.3 million for the first half of 2019, reflecting an income tax benefit of $13.9 million.

The increase in segment income before income taxes was primarily driven by increases in net interest income before provision for credit losses and noninterest income, partially offset by an increase in noninterest expense. First half 2020 net interest income before provision for credit losses was $61.7 million, an increase of $9.5 million or 18%, compared with $52.2 million for the same period in 2019. The increase reflected a 42% decrease in interest expense paid on deposits, driven by a decline in the average cost of deposits and an increase in FTP net spread. The favorable impact on net interest income before provision for credit losses was partially offset by a decrease in interest income on investments. First half 2020 noninterest income was $16.0 million, an increase of $7.6 million or 90%, compared with $8.4 million for the same period in 2019, primarily driven by the aforementioned sales of municipal bonds during the second quarter of 2020. First half 2020 noninterest expense was $64.4 million, an increase of $9.2 million or 17%, compared with $55.2 million for the same period in 2019. The increase was primarily due to the aforementioned debt extinguishment cost of $8.7 million during the second quarter of 2020.

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The income tax expense or benefit in the Other segment consists of the remaining unallocated income tax expense or benefit after allocating income tax expense to the two core segments. Income tax expense is allocated to the Consumer and Business Banking and the Commercial Banking segments by applying statutory income tax rates to the segment income before income taxes.

Balance Sheet Analysis

The following table presents a discussion of the significant changes between June 30, 2020 and December 31, 2019:

Selected Consolidated Balance Sheet Data

($ in thousands)						June 30, 2020						December 31, 2019						Change
																											$						%
						(Unaudited)
ASSETS
Cash and cash equivalents						$	4,533,502					$	3,261,149					$	1,272,353					39		%
Interest-bearing deposits with banks						531,591						196,161						335,430						171		%
Resale agreements						1,260,000						860,000						400,000						47		%
AFS debt securities, at fair value (amortized cost of $3,823,714 in 2020)						3,884,574						3,317,214						567,360						17		%
Restricted equity securities, at cost						78,963						78,580						383						0		%
Loans held-for-sale						3,875						434						3,441						793		%
Loans held-for-investment (net of allowance for loan losses of $632,071 in 2020 and $358,287 in 2019)						36,597,341						34,420,252						2,177,089						6		%
Investments in qualified affordable housing partnerships, net						201,888						207,037						(5,149)						(2)		%
Investments in tax credit and other investments, net						251,318						254,140						(2,822)						(1)		%
Premises and equipment, net						110,709						118,364						(7,655)						(6)		%
Goodwill						465,697						465,697						—						—		%
Operating lease right-of-use assets						94,898						99,973						(5,075)						(5)		%
Other assets						1,393,237						917,095						476,142						52		%
TOTAL						$	49,407,593					$	44,196,096					$	5,211,497					12		%
LIABILITIES
Noninterest-bearing						$	13,940,420					$	11,080,036					$	2,860,384					26		%
Interest-bearing						26,732,258						26,244,223						488,035						2		%
Total deposits						40,672,678						37,324,259						3,348,419						9		%
Short-term borrowings						252,851						28,669						224,182						782		%
FHLB advances						656,759						745,915						(89,156)						(12)		%
Repurchase agreements						300,000						200,000						100,000						50		%
Long-term debt and finance lease liabilities (1)						1,580,442						152,270						1,428,172						938		%
Operating lease liabilities						102,708						108,083						(5,375)						(5)		%
Accrued expenses and other liabilities						854,912						619,283						235,629						38		%
Total liabilities						44,420,350						39,178,479						5,241,871						13		%
STOCKHOLDERS’ EQUITY						4,987,243						5,017,617						(30,374)						(1)		%
TOTAL						$	49,407,593					$	44,196,096					$	5,211,497					12		%

(1)Includes $1.43 billion of advances from the Federal Reserve’s PPPLF.

As of June 30, 2020, total assets were $49.41 billion, an increase of $5.21 billion or 12% from December 31, 2019, primarily due to loan growth and increases in cash equivalents, AFS debt securities, resale agreements and interest-bearing deposits with banks. The loan growth came from each of the Company’s major loan portfolios, with the strongest growth from C&I, driven by PPP loan growth. CRE and single-family residential loans contributed to the growth as well. The increase in cash and cash equivalents was primarily driven by deposit growth and advances from PPPLF.

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As of June 30, 2020, total liabilities were $44.42 billion, an increase of $5.24 billion or 13% from December 31, 2019, primarily due to increases in deposits and long-term debt. The increase in deposits was largely driven by increases in noninterest-bearing demand and money market accounts, partially offset by a decrease in time deposits. Deposit growth was attributable to strong growth from consumer and small business commercial customers, as well as to PPP funds held in deposit accounts, partially offset by intentional run-off of higher-cost balances. The increase in long-term debt was primarily driven by advances from PPPLF.

As of June 30, 2020, total stockholders’ equity was $4.99 billion, a decrease of $30.4 million or 1% from December 31, 2019. This decrease was primarily driven by stock repurchase transactions, cash dividends declared on common stock and a cumulative-effect adjustment to retained earnings due to the adoption of ASU 2016-13, partially offset by first half 2020 net income.

Debt Securities

The Company maintains a debt securities portfolio that consists of high quality and liquid securities with relatively short durations to minimize overall interest rate and liquidity risks. The Company’s AFS debt securities provide:

•interest income for earnings and yield enhancement;

•availability for funding needs arising during the normal course of business;

•the ability to execute interest rate risk management strategies in response to changes in economic or market conditions; and

•collateral to support pledging agreements as required and/or to enhance the Company’s borrowing capacity.

Available-for-Sale Debt Securities

As of June 30, 2020 and December 31, 2019, the Company’s AFS debt securities portfolio primarily consisted of mortgage-backed securities and debt securities issued by U.S. government agency and U.S. government-sponsored enterprises, collateralized loan obligations (“CLOs”), non-agency mortgage-backed securities, U.S. Treasury securities, municipal securities, and foreign bonds. Debt securities classified as AFS are carried at their fair value with the corresponding changes in fair value recorded in Accumulated other comprehensive loss, net of tax, as a component of Stockholders’ equity on the Consolidated Balance Sheet.

The following table presents the amortized cost and fair value of AFS debt securities by major categories as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020																		December 31, 2019
									Amortized Cost						Fair Value						Amortized Cost						Fair Value
AFS debt securities:
U.S. Treasury securities						$	250,494					$	251,201					$	177,215					$	176,422
U.S. government agency and U.S. government-sponsored enterprise debt securities						433,923						442,644						584,275						581,245
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities						2,074,538						2,139,335						1,598,261						1,607,368
Municipal securities						208,333						215,184						101,621						102,302
Non-agency mortgage-backed securities						261,870						265,706						133,439						135,098
Corporate debt securities						31,254						30,826						11,250						11,149
Foreign bonds (1)						204,540						204,080						354,481						354,172
Asset-backed securities						64,762						61,619						66,106						64,752
CLOs						294,000						273,979						294,000						284,706
Total AFS debt securities						$	3,823,714					$	3,884,574					$	3,320,648					$	3,317,214

(1)There were no securities of a single non-governmental agency issuer that exceeded 10% of stockholder’s equity as of both June 30, 2020 and December 31, 2019.

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The fair value of AFS debt securities totaled $3.88 billion as of June 30, 2020, compared with $3.32 billion as of December 31, 2019. The $567.4 million or 17% increase was primarily attributable to the purchases of U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities, municipal securities, U.S. Treasury securities, and non-agency mortgage-backed securities; partially offset by the sales, repayments, calls, and maturities of U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities, U.S. government agency and U.S. government-sponsored enterprise debt securities, foreign bonds, municipal securities and U.S Treasury securities.

The Company’s debt securities portfolio had an effective duration of 2.6 years as of June 30, 2020 which shortened from 3.1 years as of December 31, 2019, primarily due to a decline in interest rates. In addition, the spread between central government-guaranteed securities and private issuers widened, as relatively higher risk premiums were paid for securities issued by private entities. As of June 30, 2020 and December 31, 2019, 94% and 97%, respectively, of the carrying value of the Company’s debt securities portfolio was rated “AA-” or “Aa3” or higher by nationally recognized credit rating agencies. Credit ratings of BBB- or higher by Standard and Poor’s (“S&P”) and Fitch Ratings (“Fitch”), or Baa3 or higher by Moody’s Investors Service (“Moody’s”), are considered investment grade.

The Company’s AFS debt securities are carried at fair value with noncredit-related unrealized gains and losses, net of tax, reported in Other comprehensive income (loss) on the Consolidated Statement of Comprehensive Income. If a credit loss exists, the Company records impairment related to credit losses through allowance for credit losses with a corresponding Provision for credit losses on the Consolidated Statement of Income. Pre-tax net unrealized gains on AFS debt securities were $60.9 million as of June 30, 2020, which improved from net unrealized losses of $3.4 million as of December 31, 2019. This change was primarily due to the decrease in interest rates during the period, partially offset by increased spreads.

Gross unrealized losses on AFS debt securities totaled $29.7 million as of June 30, 2020, compared with $23.2 million as of December 31, 2019. Of the securities with gross unrealized losses, substantially all were rated investment grade as of both June 30, 2020 and December 31, 2019, as classified based upon the lowest of the credit ratings issued by S&P, Moody’s, or Fitch. The Company believes that the gross unrealized losses were due to non-credit related factors and the gross unrealized losses across all major security types were primarily attributable to widened spreads arising from the negative outlook and uncertainty as a result of the COVID-19 pandemic, and yield curve movement. The Company believes that the credit support levels of the AFS debt securities are strong and, based on current assessments and macroeconomic forecasts, expects that full contractual cash flows will be received, even if the credit performance deteriorates from the impact of the COVID-19 pandemic.

As of June 30, 2020, the Company had no intention to sell securities with unrealized losses and believed it is more-likely-than-not that it would not be required to sell such securities before recovery of their amortized costs. The Company assesses individual securities for credit losses for each reporting period. There were no credit losses recognized in earnings for the second quarter and first half of 2020, and no OTTI credit losses recognized in earnings for the same periods of 2019. For additional information of the Company’s accounting policies, valuation and composition, see Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies, Note 3 — Fair Value Measurement and Fair Value of Financial Instruments and Note 5 — Securities to the Consolidated Financial Statements in this Form 10-Q.

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The following table presents the weighted-average yields and contractual maturity distribution, excluding periodic principal payments, of the Company’s debt securities as of June 30, 2020 and December 31, 2019. Actual maturities of mortgage-backed securities can differ from contractual maturities as the borrowers have the right to prepay obligations with or without prepayment penalties. In addition, factors such as prepayments and interest rates may affect the yields on the carrying values of mortgage-backed securities.

($ in thousands)						June 30, 2020																														December 31, 2019
									Amortized Cost						Fair Value						Yield (1)						Amortized Cost						Fair Value						Yield (1)
AFS debt securities:
U.S. Treasury securities:
Maturing in one year or less						$	199,985					$	199,986					0.13		%				$	—					$	—					—		%
Maturing after one year through five years						50,509						51,215						1.26		%				177,215						176,422						1.33		%
Total						250,494						251,201						0.36		%				177,215						176,422						1.33		%
U.S. government agency and U.S. government- sponsored enterprise debt securities:
Maturing in one year or less						204,966						205,571						2.52		%				328,628						326,341						2.62		%
Maturing after one year through five years						157,963						162,504						2.69		%				158,490						156,431						2.69		%
Maturing after five years through ten years						27,450						28,905						2.51		%				44,908						45,189						2.38		%
Maturing after ten years						43,544						45,664						2.75		%				52,249						53,284						2.78		%
Total						433,923						442,644						2.61		%				584,275						581,245						2.63		%
U.S. government agency and U.S. government- sponsored enterprise mortgage-backed securities:
Maturing in one year or less						—						—						—		%				112						113						2.72		%
Maturing after one year through five years						22,326						23,271						2.60		%				23,144						23,289						2.29		%
Maturing after five years through ten years						139,193						146,545						2.38		%				85,970						88,261						2.72		%
Maturing after ten years						1,913,019						1,969,519						2.47		%				1,489,035						1,495,705						2.66		%
Total						2,074,538						2,139,335						2.47		%				1,598,261						1,607,368						2.66		%
Municipal securities (2):
Maturing in one year or less						43,330						43,586						2.72		%				37,136						37,291						2.67		%
Maturing after one year through five years						15,549						15,888						2.50		%				18,699						18,948						2.52		%
Maturing after five years through ten years						69,112						72,240						2.83		%				12,151						12,451						3.15		%
Maturing after ten years						80,342						83,470						3.26		%				33,635						33,612						2.63		%
Total						208,333						215,184						2.95		%				101,621						102,302						2.69		%
Non-agency mortgage-backed securities:
Maturing in one year or less						7,920						7,889						2.08		%				—						—						—		%
Maturing after one year through five years						—						—						—		%				7,920						7,914						3.78		%
Maturing after five years through ten years						32,064						31,988						2.99		%				—						—						—		%
Maturing after ten years						221,886						225,829						2.98		%				125,519						127,184						3.21		%
Total						261,870						265,706						2.95		%				133,439						135,098						3.24		%
Corporate debt securities:
Maturing in one year or less						1,250						1,251						4.53		%				1,250						1,262						5.20		%
Maturing after one year through five years						20,000						19,523						4.69		%				10,000						9,887						4.00		%
Maturing after five years through ten years						10,004						10,052						5.23		%				—						—						—		%
Total						31,254						30,826						4.85		%				11,250						11,149						4.13		%
Foreign bonds:
Maturing in one year or less						104,484						104,586						1.90		%				354,481						354,172						2.22		%
Maturing after one year through five years						100,056						99,494						2.11		%				—						—						—		%
Total						204,540						204,080						2.00		%				354,481						354,172						2.22		%
Asset-backed securities:
Maturing after ten years						64,762						61,619						1.03		%				66,106						64,752						2.65		%
CLOs:
Maturing after ten years						294,000						273,979						3.07		%				294,000						284,706						3.08		%
Total AFS debt securities						$	3,823,714					$	3,884,574					2.42		%				$	3,320,648					$	3,317,214					2.60		%
Total aggregated by maturities:
Maturing in one year or less						$	561,935					$	562,869					1.57		%				$	721,607					$	719,179					2.43		%
Maturing after one year through five years						366,403						371,895						2.43		%				395,468						392,891						2.11		%
Maturing after five years through ten years						277,823						289,730						2.68		%				143,029						145,901						2.65		%
Maturing after ten years						2,617,553						2,660,080						2.58		%				2,060,544						2,059,243						2.76		%
Total AFS debt securities						$	3,823,714					$	3,884,574					2.42		%				$	3,320,648					$	3,317,214					2.60		%

(1)Weighted-average yields are computed based on amortized cost balances.

(2)Yields on tax-exempt securities are not presented on a tax-equivalent basis.

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Loan Portfolio

The Company offers a broad range of financial products designed to meet the credit needs of its borrowers. The Company’s loan portfolio segments include commercial loans, which consist of C&I, CRE, multifamily residential, and construction and land loans; and consumer loans, which consist of single-family residential, home equity lines of credit (“HELOCs”) and other consumer loans. Total net loans, including loans held-for-sale, were $36.60 billion as of June 30, 2020, an increase of $2.18 billion or 6% from $34.42 billion as of December 31, 2019. This was primarily driven by increases of $1.27 billion or 10% in C&I loans driven by PPP loan growth, $623.7 million or 6% in CRE loans and $554.9 million or 8% in single-family residential loans. The composition of the loan portfolio as of June 30, 2020 was similar to the composition as of December 31, 2019.

The following table presents the composition of the Company’s total loan portfolio by loan type as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020																		December 31, 2019
									Amount (1)						%						Amount (1)						%
Commercial:
C&I (2)						$	13,422,691					36		%				$	12,150,931					35		%
CRE:
CRE						10,902,114						29		%				10,278,448						30		%
Multifamily residential						3,032,385						8		%				2,856,374						8		%
Construction and land						567,716						2		%				628,499						2		%
Total CRE						14,502,215						39		%				13,763,321						40		%
Total commercial						27,924,906						75		%				25,914,252						75		%
Consumer:
Residential mortgage:
Single-family residential						7,660,094						21		%				7,108,590						20		%
HELOCs						1,461,951						4		%				1,472,783						4		%
Total residential mortgage						9,122,045						25		%				8,581,373						24		%
Other consumer						182,461						0		%				282,914						1		%
Total consumer						9,304,506						25		%				8,864,287						25		%
Total loans held-for-investment						37,229,412						100		%				34,778,539						100		%
Allowance for loan losses						(632,071)												(358,287)
Loans held-for-sale (3)						3,875												434
Total loans, net						$	36,601,216											$	34,420,686

(1)On January 1, 2020, the Company adopted ASU 2016-13. Total loans include net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts of $(72.1) million and $(43.2) million as of June 30, 2020 and December 31, 2019, respectively. Net origination fees related to PPP loans were $(25.4) million as of June 30, 2020.

(2)Includes $1.75 billion of PPP loans as of June 30, 2020.

(3)Consists of single-family residential loans as of both June 30, 2020 and December 31, 2019.

Actions to Support Customers during the COVID-19

In response to the COVID-19 pandemic, the Company provided assistance to customers faced with financial difficulties by offering SBA PPP loans and also provided customers with payment relief through various loan modification programs. For a summary of the loans that the Company has modified in response to COVID-19, please refer to Item 2. MD&A — Risk Management — Credit Risk Management in this Form 10-Q.

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In April 2020, the Company started accepting PPP applications and began to originate loans to qualified small businesses under the PPP established by the CARES Act. These loans are included in the C&I portfolio, carrying an interest rate of 1%, and are 100% guaranteed by the SBA. No allowance for loan losses were recorded for these loans as of June 30, 2020. The Company has funded over 7,200 PPP loans for customers with an outstanding loan balance totaling $1.75 billion as of June 30, 2020. The majority of the Company’s PPP loans have a term of two years. The SBA pays the Company fees for processing PPP loans in the following amounts: (1) five percent for loans of not more than $350,000; (2) three percent for loans of more than $350,000 and less than $2,000,000; and (3) one percent for loans of at least $2,000,000. Loan processing fees paid to the Company by the SBA are accounted for as loan origination fees, where net deferred fees are recognized over the estimated life of the loan as a yield adjustment on the loans. Payments by borrowers on PPP loans begin ten months after the loan forgiveness covered period. Under the terms of the PPP, such loans are eligible to be forgiven if certain conditions are satisfied, in which case the SBA will make payments to the Company for the forgiven amounts. If a loan is paid off or forgiven by the SBA prior to its projected estimated life, the remaining unamortized deferred fees will be recognized as interest income in that period. The PPP was originally set to expire on June 30, 2020. On July 4, 2020, the President signed legislation extending the PPP to August 8, 2020. The Company will continue to originate loans to qualified small businesses through the latest extension date.

Commercial

The commercial loan portfolio comprised 75% of total loans as of both June 30, 2020 and December 31, 2019. Given the widespread impact of the COVID-19 pandemic on the U.S. and the global economy, a number of industries have been or will be adversely impacted. The Company continues to actively evaluate and monitor all industries and its entire commercial portfolio for elevated levels of credit risk. During the second quarter of 2020, we undertook a review of our loan portfolio to evaluate credit exposures for sensitivity to prospective weakening of economic conditions and reviewed certain C&I and CRE loans, with a particular focus on sectors that we believe are of higher risk during the COVID-19 pandemic.

Commercial — Commercial and Industrial Loans. C&I loans totaled $13.42 billion and $12.15 billion, which accounted for 36% and 35% of total loans held-for-investment, as of June 30, 2020 and December 31, 2019, respectively. The $1.27 billion or 10% increase in C&I loans was primarily due to the funding of PPP loans during the second quarter of 2020. The majority of the C&I loans are variable interest rate loans. The C&I loan portfolio includes loans and financing for businesses in a wide spectrum of industries, and includes asset-based lending, equipment financing and leasing, project-based finance, revolving lines of credit, SBA lending, structured finance, term loans and trade finance. The Company also had a portfolio of broadly syndicated C&I loans, comprised primarily of Term B loans, which totaled $960.8 million and $894.6 million as of June 30, 2020 and December 31, 2019, respectively.

The C&I portfolio is well-diversified by industry. The Company monitors the concentrations within the C&I loan portfolio by customer exposure and industry classification, setting diversification targets and limits for specialized underwriting portfolios. Exposures to various industries within our C&I portfolio are shown in the following charts as of June 30, 2020 and December 31, 2019. Given the uncertainty and rapidly evolving socioeconomic impacts of the COVID-19 pandemic, the Company is actively monitoring its loan portfolio, assessing the financial conditions of borrowers and guarantors, and the valuation of collateral.

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Oil & gas loans comprised 10% of C&I loans and 3% of total loans held-for-investment as of June 30, 2020. There were $1.27 billion in oil & gas loans outstanding and $346.9 million in unfunded commitments as of June 30, 2020. Based on total commitment as of June 30, 2020, the oil & gas portfolio consisted of 62% exploration & production (“E&P”) companies, 32% midstream and downstream companies, and 6% oilfield services and other companies. Oil & gas loans comprised 11% of C&I loans and 4% of total loans held-for-investment as of December 31, 2019. There were $1.33 billion in oil & gas loans outstanding and $477.6 million in unfunded commitments as of December 31, 2019. Based on total commitment as of December 31, 2019, the oil & gas portfolio consisted of 64% E&P companies, 29% midstream and downstream companies, and 7% oilfield services and other companies. The COVID-19 pandemic, as well as the high volatility and downward pressure on oil & gas prices, have unfavorably impacted the credit risk of the oil & gas industry sector. Accordingly, the Company increased its allowance for loan loss coverage against the oil & gas portfolio to 9% as of June 30, 2020, up from 5% as of December 31, 2019.

Commercial — Commercial Real Estate Portfolio. The total CRE loan portfolio, which consists of income-producing CRE, multifamily residential, and construction and land loans, totaled $14.50 billion and $13.76 billion, which accounted for 39% and 40% of total loans held-for-investment as of June 30, 2020 and December 31, 2019, respectively.

The Company’s total CRE portfolio is broadly diversified by property type, which serves to mitigate some of the geographical concentration in California. The following table summarizes the Company’s total CRE loan portfolio by property type as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020																		December 31, 2019
									Amount						%						Amount						%
Property types:
Retail						$	3,435,612					24		%				$	3,300,106					24		%
Multifamily						3,032,385						21		%				2,856,374						21		%
Offices						2,573,520						18		%				2,375,087						17		%
Industrial						2,345,757						16		%				2,163,769						16		%
Hospitality						1,946,437						13		%				1,865,031						14		%
Construction and land						567,716						4		%				628,499						4		%
Other						600,788						4		%				574,455						4		%
Total CRE loans						$	14,502,215					100		%				$	13,763,321					100		%

Approximately 90% of our total CRE loans had a loan-to-value (“LTV”) ratio of 65% or lower as of June 30, 2020, compared to 85% as of December 31, 2019. The weighted-average LTV ratios of total CRE loans were 52% and 50% as of June 30, 2020 and December 31, 2019, respectively. The low LTV ratio was consistent across the various CRE property types. The average loan size of total CRE loans was $2.3 million and $2.1 million as of June 30, 2020 and December 31, 2019, respectively. The consistency of the Company’s low LTV underwriting standards has resulted in historically lower levels of credit losses in the income-producing CRE and multifamily residential loans.

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The following tables provide a summary of the Company’s CRE, multifamily residential, and construction and land loans by geography as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020
									CRE						%						Multifamily Residential						%						Construction and Land						%						Total CRE						%
Geographic markets:
Southern California						$	5,798,259											$	1,821,098											$	265,759											$	7,885,116
Northern California						2,517,384												664,186												168,257												3,349,827
California						8,315,643						77		%				2,485,284						82		%				434,016						77		%				11,234,943						77		%
New York						690,064						6		%				125,408						4		%				85,183						15		%				900,655						6		%
Texas						696,290						6		%				137,376						4		%				6,831						1		%				840,497						6		%
Washington						330,964						3		%				84,842						3		%				14,931						3		%				430,737						3		%
Arizona						147,789						1		%				12,156						0		%				—						—		%				159,945						1		%
Nevada						92,773						1		%				138,632						5		%				7,917						1		%				239,322						2		%
Other markets						628,591						6		%				48,687						2		%				18,838						3		%				696,116						5		%
Total loans						$	10,902,114					100		%				$	3,032,385					100		%				$	567,716					100		%				$	14,502,215					100		%

($ in thousands)						December 31, 2019
									CRE						%						Multifamily Residential						%						Construction and Land						%						Total CRE						%
Geographic markets:
Southern California						$	5,446,786											$	1,728,086											$	247,170											$	7,422,042
Northern California						2,359,808												603,135												203,706												3,166,649
California						7,806,594						76		%				2,331,221						82		%				450,876						72		%				10,588,691						77		%
New York						701,902						7		%				116,923						4		%				79,962						13		%				898,787						7		%
Texas						628,576						6		%				124,646						4		%				8,604						1		%				761,826						6		%
Washington						306,247						3		%				55,913						2		%				37,552						6		%				399,712						3		%
Arizona						149,151						1		%				37,208						1		%				6,951						1		%				193,310						1		%
Nevada						102,891						1		%				138,577						5		%				40						0		%				241,508						2		%
Other markets						583,087						6		%				51,886						2		%				44,514						7		%				679,487						4		%
Total loans (1)						$	10,278,448					100		%				$	2,856,374					100		%				$	628,499					100		%				$	13,763,321					100		%

(1)Loans net of ASC 310-30 discount.

As the majority of these loans are concentrated in the California geographic market, changes in California’s economy and real estate values could have a significant impact on the collectability of these loans and the required level of allowance for loan losses.

Commercial — Income-Producing Commercial Real Estate Loans. The Company focuses on providing financing to experienced real estate investors and developers who have moderate levels of leverage, many of whom are long-time customers of the Bank. Loans are underwritten with conservative standards for cash flows, debt service coverage and LTV. Income-producing CRE loans totaled $10.90 billion and $10.28 billion, which accounted for 29% and 30% of total loans held-for-investment as of June 30, 2020 and December 31, 2019, respectively.

20% of the income-producing CRE loans were owner occupied properties as of June 30, 2020 and December 31, 2019. The remainder were non-owner-occupied properties, where 50% or more of the debt service for the loan is primarily provided by unaffiliated rental income from a third party. Interest rates on CRE loans may be fixed, variable or hybrid. The distribution of the CRE loan portfolio reflects the Company’s geographical footprint, with a primary concentration in California, which accounted for 77% and 76% of the CRE loan portfolio as of June 30, 2020 and December 31, 2019, respectively.

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Commercial — Multifamily Residential Loans. The multifamily residential loan portfolio is largely comprised of loans secured by residential properties with five or more units. The Company offers a variety of first lien mortgages, including fixed- and variable-rate loans, as well as hybrid loans with interest rates that adjust annually after an initial fixed rate period of three to seven years. Multifamily residential loans totaled $3.03 billion and $2.86 billion as of June 30, 2020 and December 31, 2019, respectively, and accounted for 8% of total loans held-for-investment as of both dates. As of June 30, 2020 and December 31, 2019, 82% of the Company’s multifamily residential loans were concentrated in California.

Commercial — Construction and Land Loans. Construction and land loans provide financing for multifamily residential, hotels, offices and industrial structures. These loans totaled $567.7 million and $628.5 million as of June 30, 2020 and December 31, 2019, respectively, and accounted for 2% of total loans held-for-investment as of both periods. Included in the portfolio were construction loans of $516.8 million and $558.2 million, with additional unfunded commitments of $365.4 million and $351.4 million, as of June 30, 2020 and December 31, 2019, respectively. Similar to CRE and multifamily residential loans, the Company has a geographic concentration of construction and land loans in California.

Consumer

The following tables summarize the Company’s single-family residential and HELOCs loan portfolios by geography as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020
									Single- Family Residential						%						HELOCs						%						Total Residential Mortgage						%
Geographic markets:
Southern California						$	3,264,997											$	686,880											$	3,951,877
Northern California						1,081,863												320,074												1,401,937
California						4,346,860						57		%				1,006,954						69		%				5,353,814						59		%
New York						1,966,455						26		%				235,546						16		%				2,202,001						24		%
Washington						622,626						8		%				144,985						10		%				767,611						8		%
Massachusetts						242,388						3		%				34,591						2		%				276,979						3		%
Texas						190,795						2		%				—						—		%				190,795						2		%
Other markets						290,970						4		%				39,875						3		%				330,845						4		%
Total						$	7,660,094					100		%				$	1,461,951					100		%				$	9,122,045					100		%
Lien priority:
First mortgage						$	7,660,093					100		%				$	1,226,845					84		%				$	8,886,938					97		%
Junior lien mortgage						1						0		%				235,106						16		%				235,107						3		%
Total						$	7,660,094					100		%				$	1,461,951					100		%				$	9,122,045					100		%

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($ in thousands)						December 31, 2019
									Single- Family Residential						%						HELOCs						%						Total Residential Mortgage						%
Geographic markets:
Southern California						$	3,081,368											$	702,915											$	3,784,283
Northern California						1,038,945												309,883												1,348,828
California						4,120,313						58		%				1,012,798						69		%				5,133,111						60		%
New York						1,657,732						23		%				257,344						17		%				1,915,076						22		%
Washington						630,307						9		%				133,625						9		%				763,932						9		%
Massachusetts						235,393						3		%				31,310						2		%				266,703						3		%
Texas						188,838						3		%				—						—		%				188,838						2		%
Other markets						276,007						4		%				37,706						3		%				313,713						4		%
Total (1)						$	7,108,590					100		%				$	1,472,783					100		%				$	8,581,373					100		%
Lien priority:
First mortgage						$	7,108,588					100		%				$	1,238,186					84		%				$	8,346,774					97		%
Junior lien mortgage						2						0		%				234,597						16		%				234,599						3		%
Total (1)						$	7,108,590					100		%				$	1,472,783					100		%				$	8,581,373					100		%

(1)Loans net of ASC 310-30 discount.

Consumer — Single-Family Residential Loans. The Company offers a variety of single-family residential first lien mortgage loan programs, including fixed- and variable-rate loans, as well as hybrid loans with interest rates that adjust annually after an initial fixed rate period. Single-family residential loans totaled $7.66 billion and $7.11 billion, which accounted for 21% and 20% of total loans held-for-investment as of June 30, 2020 and December 31, 2019, respectively. The Company was in a first lien position for virtually all single-family residential loans as of both June 30, 2020 and December 31, 2019. Many of these loans were reduced documentation loans where a substantial down payment was required, resulting in a low LTV ratio at origination, typically 60% or less. These loans have historically experienced low delinquency and loss rates. As of June 30, 2020 and December 31, 2019, 57% and 58% of the Company’s single-family residential loans, respectively, were concentrated in California.

Consumer — Home Equity Lines of Credit. HELOCs totaled $1.46 billion and $1.47 billion as of June 30, 2020 and December 31, 2019, respectively, and accounted for 4% of total loans held-for-investment as of both periods. The Company was in a first lien position for 84% of total HELOCs as of June 30, 2020 and December 31, 2019. Many of the loans within this portfolio were reduced documentation loans, where a substantial down payment was required, resulting in a low LTV ratio at origination, typically 60% or less. These loans have historically experienced low delinquency and loss rates. As of June 30, 2020 and December 31, 2019, 69% of the Company’s HELOCs were concentrated in California. The HELOC portfolio is comprised largely of variable-rate loans.

All commercial and consumer loans originated are subject to the Company’s underwriting guidelines and loan origination standards. Management believes that the Company’s underwriting criteria and procedures adequately consider the unique risks associated with these products. The Company conducts a variety of quality control procedures and periodic audits, including the review of lending and legal requirements, to ensure that the Company is in compliance with these requirements.

Purchased Credit Deteriorated Loans

The Company adopted ASU 2016-13 using the prospective transition approach for purchased financial assets with credit deterioration that were previously classified as purchased credit impaired (“PCI”) and accounted for under ASC 310-30. On January 1, 2020, the amortized cost basis of the purchased credit deteriorated (“PCD”) loans was adjusted to reflect the $1.2 million addition of allowance for loan losses. The Company did not acquire any PCD loans during the first and second quarter of 2020. For additional details regarding PCD loans, see Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies and Note 7 — Loans Receivable and Allowance for Credit Losses to the Consolidated Financial Statements in this Form 10-Q. Prior to the adoption of ASU 2016-13, the carrying value of PCI loans totaled $222.9 million as of December 31, 2019.

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Loans Held-for-Sale

As of June 30, 2020 and December 31, 2019, loans held-for-sale totaled $3.9 million and $434 thousand, respectively, and consisted of single-family residential loans. At the time of commitment to originate or purchase a loan, a loan is determined to be held-for-investment if it is the Company’s intent to hold the loan to maturity or for the “foreseeable future,” subject to periodic reviews under the Company’s evaluation processes, including liquidity and credit risk management. If the Company subsequently changes its intent to hold certain loans, those loans are transferred from held-for-investment to held-for-sale at the lower of cost or fair value.

Loan Purchases, Transfers and Sales

All loans originated by the Company are underwritten pursuant to the Company’s policies and procedures. Although the Company’s primary focus is on directly originated loans, in certain circumstances, the Company also purchases loans and participates in loans with other banks. The Company also participates out interests in commercial loans to other financial institutions and sells loans in the normal course of business.

The following tables provide information on loan sales during the second quarter and first half of 2020 and 2019. Refer to Note 7 — Loans Receivable and Allowance for Credit Losses to the Consolidated Financial Statements in this Form 10-Q for additional information of loan purchases and transfers.

($ in thousands)						Three Months Ended June 30, 2020
									Commercial																																										Consumer																					Total
									C&I						CRE																														Residential Mortgage
																		CRE						Multifamily Residential						Construction and Land						Single-Family Residential
Loans sold:
Originated loans:
Amount						$	33,060					$	—					$	—					$	—					$	13,708																	$	46,768
Net gains						$	—					$	—					$	—					$	—					$	132																	$	132

($ in thousands)						Three Months Ended June 30, 2019
									Commercial																																										Consumer																					Total
									C&I						CRE																														Residential Mortgage
																		CRE						Multifamily Residential						Construction and Land						Single-Family Residential
Loans sold:
Originated loans:
Amount						$	52,972					$	—					$	—					$	1,573					$	1,172																	$	55,717
Net gains						$	—					$	—					$	—					$	—					$	15																	$	15
Purchased loans:
Amount						$	23,059					$	—					$	—					$	—					$	—																	$	23,059

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($ in thousands)						Six Months Ended June 30, 2020
									Commercial																																										Consumer																		Total
									C&I						CRE																														Residential Mortgage
																		CRE						Multifamily Residential						Construction and Land						Single-Family Residential
Loans sold:
Originated loans:
Amount						$	136,033					$	7,250					$	—					—						$	18,350																	$	161,633
Net gains						$	235					$	665					$	—					—						$	182																	$	1,082

($ in thousands)						Six Months Ended June 30, 2019
									Commercial																																										Consumer																		Total
									C&I						CRE																														Residential Mortgage
																		CRE						Multifamily Residential						Construction and Land						Single-Family Residential
Loans sold:
Originated loans:
Amount						$	110,381					$	16,655					$	—					$	1,573					$	3,614																	$	132,223
Net gains						$	131					$	753					$	—					$	—					$	46																	$	930
Purchased loans (1):
Amount						$	41,296					$	—					$	—					$	—					$	—																	$	41,296

(1)Net gains on sales of purchased loans in the first half of 2019 were insignificant.

Foreign Outstandings

The Company’s overseas offices, which include the branch in Hong Kong and the subsidiary bank in China, are subject to the general risks inherent in conducting business in foreign countries, such as regulations, or economic and political uncertainties. In addition, the Company’s financial assets held in the Hong Kong branch and the subsidiary bank in China may be affected by fluctuations in currency exchange rates or other factors. The Company’s country risk exposure is largely concentrated in China and Hong Kong. The following table presents the major financial assets held in the Company’s overseas offices as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020																		December 31, 2019
									Amount						% of Total Consolidated Assets						Amount						% of Total Consolidated Assets
Hong Kong branch:
Cash and cash equivalents						$	445,595					1		%				$	511,639					1		%
AFS debt securities (1)						$	298,041					1		%				$	204,948					0		%
Loans held-for-investment (2)						$	637,129					1		%				$	573,305					1		%
Total assets						$	1,456,836					3		%				$	1,361,652					3		%
Subsidiary bank in China:
Cash and cash equivalents						$	661,325					1		%				$	548,930					1		%
Interest-bearing deposits with banks						$	197,520					0		%				$	142,587					0		%
Loans held-for-investment (2)						$	621,378					1		%				$	819,110					2		%
Total assets						$	1,579,361					3		%				$	1,520,627					3		%

(1)Comprised of U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities, foreign bonds, and U.S. Treasury securities as of June 30, 2020; comprised of foreign bonds and U.S. Treasury securities as of December 31, 2019.

(2)Primarily comprised of C&I loans as of both June 30, 2020 and December 31, 2019.

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The following table presents the total revenue generated by the Company’s overseas offices for the second quarters and first half of 2020 and 2019:

($ in thousands)						Three Months Ended June 30,																																										Six Months Ended June 30,
									2020																		2019																		2020																		2019
									Amount						% of Total Consolidated Revenue						Amount						% of Total Consolidated Revenue						Amount						% of Total Consolidated Revenue						Amount						% of Total Consolidated Revenue
Hong Kong branch:
Total revenue						$	7,261					2		%				$	8,851					2		%				$	14,190					2		%				$	17,748					2		%
Subsidiary bank in China:
Total revenue						$	5,606					1		%				$	9,107					2		%				$	12,785					2		%				$	16,191					2		%

Capital

The Company maintains a strong capital base to support its anticipated asset growth, operating needs and credit risks, and to ensure that the Company and the Bank are in compliance with all regulatory capital guidelines. The Company engages in regular capital planning processes on at least an annual basis to optimize the use of available capital and to appropriately plan for future capital needs, allocating capital to existing and future business activities. Furthermore, the Company conducts capital stress tests as part of its capital planning process. The stress tests enable the Company to assess the impact of adverse changes in the economy and interest rates on its capital base.

In March 2020, the Company authorized the repurchase of up to $500.0 million of the Company’s common stock. This $500.0 million repurchase authorization is inclusive of the Company’s $100.0 million stock repurchase authorization previously outstanding. The Company determines the timing and amount of repurchases, based on its assessment of various factors, including prevailing market conditions, alternate uses of capital, liquidity and the economic environment. The Company repurchased 4,471,682 shares at a total cost of $146.0 million during the first quarter of 2020. The Company did not repurchase shares during the second quarter of 2020. The Company's total remaining available share repurchase authorization as of June 30, 2020 was $354.0 million.

The Company’s stockholders’ equity was $4.99 billion as of June 30, 2020, a $30.4 million or 1% decrease from $5.02 billion as of December 31, 2019. The decrease in the Company’s stockholders’ equity was primarily due to share repurchase activity of $146.0 million during the first quarter of 2020; a decrease in opening retained earnings of $98.0 million as a result of the adoption of ASU 2016-13, and cash dividends declared of $79.9 million during the first half of 2020, partially offset by first half of 2020 net income of $244.2 million. For other factors that contributed to the changes in stockholders’ equity, refer to Item 1. Consolidated Financial Statements — Consolidated Statement of Changes in Stockholders’ Equity in this Form 10-Q.

Book value was $35.25 per common share as of June 30, 2020, compared with $34.46 per common share as of December 31, 2019. The Company paid a quarterly cash dividend of $0.275 for both first and second quarter of 2020, and $0.23 and $0.275 per common share for the first and second quarter of 2019, respectively. In July 2020, the Company’s Board of Directors declared third quarter 2020 cash dividends of $0.275 per common share. The dividend is payable on August 17, 2020 to stockholders of record as of August 4, 2020.

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Deposits and Other Sources of Funds

Deposits are the Company’s primary source of funding, the cost of which has a significant impact on the Company’s net interest income and net interest margin. Additional funding is provided by short and long-term borrowings, and long-term debt. See Item 2 — MD&A — Risk Management — Liquidity Risk Management in this Form 10-Q for a discussion of the Company’s liquidity management. The following table summarizes the Company’s sources of funds as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020																		December 31, 2019																		Change
									Amount						%						Amount						%						$						%
Deposits
Noninterest-bearing demand						$	13,940,420					34		%				$	11,080,036					30		%				$	2,860,384					26		%
Interest-bearing checking						5,280,887						13		%				5,200,755						14		%				80,132						2		%
Money market						10,002,624						25		%				8,711,964						23		%				1,290,660						15		%
Savings						2,186,199						5		%				2,117,196						6		%				69,003						3		%
Time deposits						9,262,548						23		%				10,214,308						27		%				(951,760)						(9)		%
Total deposits						$	40,672,678					100		%				$	37,324,259					100		%				$	3,348,419					9		%
Other Funds
Short-term borrowings (1)						$	252,851											$	28,669											$	224,182					782		%
FHLB advances						656,759												745,915												(89,156)						(12)		%
Repurchase agreements						300,000												200,000												100,000						50		%
Long-term debt (2)						1,575,653												147,101												1,428,552						971		%
Total other funds						$	2,785,263											$	1,121,685											$	1,663,578					148		%
Total sources of funds						$	43,457,941											$	38,445,944											$	5,011,997					13		%

(1)Includes $200.0 million of FRB discount window borrowing.

(2)Includes $1.43 billion of advances from the Federal Reserve’s PPPLF.

Deposits

The Company offers a wide variety of deposit products to both consumer and commercial customers. The Company’s deposit strategy is to grow and retain relationship-based deposits, which provides a stable and low-cost source of funding and liquidity to the Company.

Total deposits were $40.67 billion as of June 30, 2020, an increase of $3.35 billion or 9% from $37.32 billion as of December 31, 2019. This growth was primarily due to a $2.86 billion or 26% increase in noninterest-bearing demand and a $1.29 billion or 15% increase in money market, partially offset by a $951.8 million or 9% decrease in time deposits. The increase in noninterest-bearing demand deposits was attributable to strong growth from consumer and small business commercial demand accounts, as well as PPP funds held in deposit accounts. Noninterest-bearing demand deposits comprised 34% and 30% of total deposits as of June 30, 2020 and December 31, 2019, respectively. Additional information regarding the impact of deposits on net interest income and a comparison of average deposit balances and rates are provided in Item 2. MD&A — Results of Operations — Net Interest Income in this Form 10-Q.

Other Sources of Funding

Short-term borrowings were comprised of FRB discount window borrowing and short-term borrowings entered into by the Company’s subsidiary, East West Bank (China) Limited. The Company had $252.9 million of short-term borrowings outstanding as of June 30, 2020, compared with $28.7 million as of December 31, 2019. During the second quarter of 2020, the Company borrowed $200.0 million from the FRB discount window with a term of 90 days at a rate of 0.25%. Short-term borrowings entered by East West Bank (China) Limited was $52.9 million and $28.7 million as of June 30, 2020 and December 31, 2019, respectively. As of June 30, 2020, short-term borrowings entered by East West Bank (China) Limited had fixed interest rates ranging from 3.68% to 3.73%, and will mature between the third quarter of 2020 and the first quarter of 2021.

FHLB advances were $656.8 million as of June 30, 2020, a decrease of $89.2 million or 12% from $745.9 million as of December 31, 2019. As of June 30, 2020, FHLB advances had fixed and floating interest rates ranging from zero to 2.34% with remaining maturities between 0.3 years and 2.4 years.

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Gross repurchase agreements totaled $300.0 million and $450.0 million as of June 30, 2020 and December 31, 2019, respectively. The decrease was primarily due to the extinguishment of $150.0 million in the second quarter of 2020. Resale and repurchase agreements are reported net, pursuant to ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements. As of June 30, 2020, the Company did not have gross resale agreements that were eligible for netting pursuant to ASC 210-20-45-11. In comparison, net repurchase agreements totaled $200.0 million as of December 31, 2019, after netting $250.0 million of gross repurchase agreements against gross resale agreements. As of June 30, 2020, gross repurchase agreements had interest rates ranging from 2.55% to 3.26%, original terms between 4.0 years and 8.5 years and remaining maturities between 3.1 years and 3.2 years.

Repurchase agreements are accounted for as collateralized financing transactions and recorded as liabilities based on the values at which the securities are sold. As of June 30, 2020, the collateral for the repurchase agreements was comprised of U.S. Treasury securities and U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities. To ensure the market value of the underlying collateral remains sufficient, the Company monitors the fair value of collateral pledged relative to the principal amounts borrowed under repurchase agreements. The Company manages liquidity risks related to the repurchase agreements by sourcing funds from a diverse group of counterparties and entering into repurchase agreements with longer durations, when appropriate. For additional details, see Note 4 — Securities Purchased under Resale Agreements and Sold under Repurchase Agreements to the Consolidated Financial Statements in this Form 10-Q.

The Company uses long-term debt to provide funding to acquire interest-earning assets, as well as to enhance liquidity and regulatory capital. Long-term debt totaled $1.58 billion and $147.1 million as of June 30, 2020 and December 31, 2019, respectively. Long-term debt is comprised of PPPLF and junior subordinated debt. During the second quarter of 2020, the Company participated in the PPPLF and added $1.43 billion to long-term debt funding at a rate of 0.35%. Junior subordinated debt qualifies as Tier 2 capital for regulatory purposes. The junior subordinated debt was issued in connection with the Company’s various pooled trust preferred securities offerings and includes the value of the common stock issued by six wholly-owned subsidiaries of the Company in conjunction with these offerings. The junior subordinated debt had a weighted-average interest rate of 2.67% and 4.21% for the first half of 2020 and 2019, respectively, with remaining maturities ranging between 15.2 years and 17.2 years as of June 30, 2020.

Regulatory Capital and Ratios

The federal banking agencies have risk-based capital adequacy guidelines intended to ensure that banking organizations maintain capital that is commensurate with the degree of risk associated with a banking organization’s operations. See Item 1. Business — Supervision and Regulation — Capital Requirements of the Company’s 2019 Form 10-K for additional details.

The Company adopted ASU 2016-13 on January 1, 2020. The Company has elected the phase-in option provided by regulatory guidance, which delays the estimated impact of CECL on regulatory capital for two years and phases the impact over three years beginning in 2022. In April 2020, in recognition of CARES Act requirements, and to facilitate the use of the PPPLF, the U.S banking agencies issued an interim final rule that banking organizations may exclude from leverage and risk-based capital requirements any eligible assets sold or pledged to the Federal Reserve on a non-recourse basis as part of these programs. The interim final rule states that PPP covered loans originated by a banking organization under PPP will be risk-weighted at zero percent for regulatory capital purposes. As a result, the June 30, 2020 capital ratios exclude the impact of the increased allowance for loan losses and risk weighted PPP loans at zero percent.

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The following table presents the Company’s and the Bank’s capital ratios as of June 30, 2020 and December 31, 2019 under the Basel III Capital Rules, and those required by regulatory agencies for capital adequacy and well-capitalized classification purposes:

						Basel III Capital Rules
									June 30, 2020																		December 31, 2019																		Minimum Regulatory Requirements						Fully Phased-in Minimum Regulatory Requirements (2)						Well- Capitalized Requirements
									Company						East West Bank						Company						East West Bank
Risk-Based Capital Ratios:
CET1 capital						12.7		%				11.9		%				12.9		%				12.9		%				4.5		%				7.0		%				6.5		%
Tier 1 capital						12.7		%				11.9		%				12.9		%				12.9		%				6.0		%				8.5		%				8.0		%
Total capital						14.4		%				13.1		%				14.4		%				13.9		%				8.0		%				10.5		%				10.0		%
Tier 1 leverage (1)						9.7		%				9.1		%				10.3		%				10.3		%				4.0		%				4.0		%				5.0		%

(1)The Tier 1 leverage well-capitalized requirement applies to the Bank only because there is no Tier 1 leverage ratio component in the definition of a well-capitalized bank-holding company.

(2)As of January 1, 2019, the 2.5% capital conservation buffer above the minimum capital ratios was required in order to avoid limitations on distributions, including dividend payments and certain discretionary bonus payments to executive officers.

The Company is committed to maintaining strong capital levels to assure the Company’s investors, customers and regulators that the Company and the Bank are financially sound. As of June 30, 2020 and December 31, 2019, both the Company and the Bank continued to exceed all “well-capitalized” capital requirements and the fully phased-in required minimum capital requirements under the Basel III Capital Rules. Total risk-weighted assets were $36.20 billion as of June 30, 2020, an increase of $1.06 billion or 3% from $35.14 billion as of December 31, 2019. The increase in the risk-weighted assets was primarily due to loan growth.

Other Matters

LIBOR Transition

On July 27, 2017, the United Kingdom’s Financial Conduct Authority, which regulates LIBOR, announced that it will no longer persuade or require banks to submit rates for the calculation of LIBOR after 2021. Given LIBOR’s extensive use across financial markets, the transition away from LIBOR presents various risks and challenges to financial markets and institutions, including to the Company. The Company’s commercial and consumer businesses issue, trade, and hold various products that are currently indexed to LIBOR. A portion of the Company’s loans, derivatives, debt securities, resale agreements, FHLB advances, as well as junior subordinated debt and repurchase agreements are indexed to LIBOR and mature after 2021. The volume of the Company’s products that are indexed to LIBOR is significant, and if not sufficiently planned for, the discontinuation of LIBOR could result in financial, operational, legal, reputational or compliance risks.

The Alternative Reference Rates Committee (“ARRC”) has proposed the Secured Overnight Financing Rate (“SOFR”) as its preferred alternative rate for LIBOR. In 2019, the ARRC released recommended fallback contract language for new issuances of LIBOR indexed bilateral business loans, syndicated loans, floating-rate notes, securitizations and residential adjustable rate mortgages. During 2020, the ARRC has continued to provide guidance on fallback language, SOFR adoption and spread adjustment methodology. The International Swaps and Derivatives Association, Inc. is in the process of developing detailed guidance on fallback contract language and amendments to the 2006 International Swaps and Derivatives Association Definitions and related protocols.

The Company has been closely monitoring the impact of COVID-19 and any potential delay in the cessation of LIBOR. Although the Financial Conduct Authority continues to assess the evolving impact of COVID-19 on firms’ LIBOR transition efforts, the target LIBOR cessation date currently remains unchanged.

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Due to the uncertainty surrounding the future of LIBOR, the transition is anticipated to span several reporting periods through the end of 2021. Certain actions already taken by the Company related to the transition of LIBOR include (1) establishing a cross-functional team to identify, assess and monitor risks associated with the transition of LIBOR and other benchmark rates, (2) completing an inventory of LIBOR indexed products, (3) implementing more robust fallback contract language for new loans, which identifies LIBOR cessation trigger events, provides for an alternative index and permits an adjustment to the margin as applicable, and (4) creating an entity-wide transition project plan, to ensure an effective transition away from LIBOR. The Company continues to monitor this activity and evaluate the related risks. The Company’s cross-functional team also manages communication of the Company’s transition plans with both internal and external stakeholders and ensures that the Company appropriately updates its business processes, analytical tools, information systems and contract language to minimize disruption during and after the LIBOR transition. For additional information related to the potential impact surrounding the transition from LIBOR on the Company’s business, see Item 1A. Risk Factors in the Company’s 2019 Form 10-K.

Off-Balance Sheet Arrangements

In the course of the Company’s business, the Company may enter into or be a party to transactions that are not recorded on the Consolidated Balance Sheet and are considered to be off-balance sheet arrangements. Off-balance sheet arrangements are any contractual arrangements to which a nonconsolidated entity is a party and under which the Company has: (1) any obligation under a guarantee contract; (2) a retained or contingent interest in assets transferred to an unconsolidated entity or similar arrangement that serves as credit, liquidity or market risk support to that entity for such assets; (3) any obligation under certain derivative instruments; or (4) any obligation under a material variable interest held by the Company in a nonconsolidated entity that provides financing, liquidity, market risk or credit risk support to the Company, or engages in leasing, hedging or research and development services with the Company.

Commitments to Extend Credit

As a financial service provider, the Company routinely enters into commitments to extend credit such as loan commitments, commercial letters of credit for foreign and domestic trade, standby letters of credit (“SBLCs”) and financial guarantees to meet the financing needs of our customers. Many of these commitments to extend credit may expire without being drawn upon. The credit policies used in underwriting loans to customers are also used to extend these commitments. Under some of these contractual agreements, the Company may also have liabilities contingent upon the occurrence of certain events. The Company’s liquidity sources have been, and are expected to be, sufficient to meet the cash requirements of its lending activities. Information about the Company’s loan commitments, commercial letters of credit and SBLCs is provided in Note 10 — Commitments and Contingencies to the Consolidated Financial Statements in this Form 10-Q.

Guarantees

In the ordinary course of business, the Company enters into various guarantee agreements in which the Company sells or securitizes loans with recourse. Under these guarantee arrangements, the Company is contingently obligated to repurchase the recourse component of the loans when the loans default. Additional information regarding guarantees is provided in Note 10 — Commitments and Contingencies to the Consolidated Financial Statements in this Form 10-Q.

A discussion of significant contractual arrangements under which the Company may be held contingently liable is included in Note 10 — Commitments and Contingencies to the Consolidated Financial Statements in this Form 10-Q. In addition, the Company has commitments and obligations under post-retirement benefit plans as described in Note 17 — Employee Benefit Plans to the Consolidated Financial Statements of the Company’s 2019 Form 10-K, and has contractual obligations for future payments on debts, borrowings and lease obligations as detailed in Item 7. MD&A — Off-Balance Sheet Arrangements and Contractual Obligations of the Company’s 2019 Form 10-K.

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Risk Management

Overview

In the course of conducting its businesses, the Company is exposed to a variety of risks, some of which are inherent to the financial services industry and others of which are more specific to the Company’s businesses. The Company operates under a Board-approved enterprise risk management (“ERM”) framework, which outlines its company-wide approach to risk management and oversight and describes the structures and practices employed to manage the current and emerging risks inherent to the Company. The Company’s ERM program incorporates risk management throughout the organization in identifying, managing, monitoring, and reporting risks. It identifies the Company’s major risk categories as capital risk, strategic risk, credit risk, liquidity risk, market risk, operational risk, reputational risk, and legal and compliance risk.

The Board of Directors monitors the ERM program to ensure independent review and oversight of the Company’s risk appetite and control environment. The Risk Oversight Committee provides focused oversight of the Company’s identified enterprise risk categories on behalf of the full Board of Directors. Under the direction of the Risk Oversight Committee, management committees apply targeted strategies to reduce the risks to which the Company’s operations are exposed.

The Company’s ERM program is executed along the three lines of defense model, which provides for a consistent and standardized risk management control environment across the enterprise. The first line of defense is comprised of production, operational, and support units. The second line of defense is comprised of various risk management and control functions charged with monitoring and managing specific major risk categories and/or risk subcategories. The third line of defense is comprised of the Internal Audit function and Independent Asset Review. Internal Audit provides assurance and evaluates the effectiveness of risk management, control, and governance processes as established by the Company. Internal Audit has organizational independence and objectivity, reporting directly to the Board’s Audit Committee. Further discussion and analyses of each major risk area are included in the following sub-sections of Risk Management.

Credit Risk Management

Credit risk is the risk that a borrower or counterparty will fail to perform according to terms and conditions of a loan or investment and expose the Company to loss. Credit risk exists with many of our assets and exposures such as loans and certain derivatives. The majority of our credit risk is associated with lending activities.

The Risk Oversight Committee has primary oversight responsibility of identifying enterprise risk categories including credit risk. The Risk Oversight Committee monitors management’s assessment of asset quality and credit risk trends, credit quality administration and underwriting standards, portfolio credit risk management and processes to enable management to control credit risk including diversification and liquidity. At the management level, the Credit Risk Management Committee has primary oversight responsibility for credit risk. The Senior Credit Supervision function manages credit policy and provides the resources to manage the line of business transactional credit risk, assuring that all exposure is risk rated according to the requirements of the credit risk rating policy. The Senior Credit Supervision function reports on the overall credit risk portfolio to senior management and the Risk Oversight Committee. The Independent Asset Review function supports a strong credit risk management culture by providing independent and objective assessments of the quality of underwriting and documentation, reporting directly to the Board’s Risk Oversight Committee. A key focus of our credit risk management is adherence to a well-controlled underwriting process.

The company assesses overall credit quality performance of our held-for-investment portfolio through an integrate analysis of specific performance ratios. This approach forms the basis of the discussion in the sections immediately following: Nonperforming Assets, TDRs and Allowance for Credit Losses.

Nonperforming Assets

Nonperforming assets are comprised of nonaccrual loans, other real estate owned (“OREO”), and other nonperforming assets. OREO and other nonperforming assets are repossessed assets and properties acquired through foreclosure, or through full or partial satisfaction of loans held-for-investment. Loans are generally placed on nonaccrual status when they become 90 days past due or when the full collection of principal or interest becomes uncertain regardless of the length of past due status. Collectability is generally assessed based on economic and business conditions, the borrower’s financial condition and the adequacy of collateral, if any. For additional details regarding the Company’s nonaccrual loan policy, see Note 1 — Summary of Significant Accounting Policies — Loans Held-for-Investment to the Consolidated Financial Statements of the Company’s 2019 Form 10-K.

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The following table presents information regarding nonperforming assets as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020						December 31, 2019
									Nonaccrual Loans						Non-PCI Nonaccrual Loans
Commercial:
C&I						$	84,823					$	74,835
CRE:
CRE						56,577						16,441
Multifamily residential						774						819
Total CRE						57,351						17,260
Consumer:
Residential mortgage:
Single-family residential						20,070						14,865
HELOCs						14,068						10,742
Total residential mortgage						34,138						25,607
Other consumer						2,508						2,517
Total nonaccrual loans						178,820						120,219
OREO, net						19,504						125
Other nonperforming assets						3,890						1,167
Total nonperforming assets						$	202,214					$	121,511
Nonperforming assets to total assets						0.41		%				0.27		%
Nonaccrual loans to loans held-for-investment						0.48		%				0.35		%
Allowance for loan losses to nonaccrual loans						353.47		%				298.03		%
Annualized quarterly net charge-offs to average loans held-for-investment						0.21		%				0.10		%
TDRs included in nonperforming loans						$	23,733					$	54,566

Period-over-period changes to nonaccrual loans represent loans that are placed on nonaccrual status in accordance with the Company’s accounting policy, offset by reductions for loan repayments and for loans that are paid down, charged off, sold, foreclosed, or no longer classified as nonaccrual as a result of continued performance and improvement in the borrowers’ financial condition. Nonaccrual loans were $178.8 million as of June 30, 2020, an increase of $58.6 million or 49% from $120.2 million as of December 31, 2019. This increase was primarily driven by the oil & gas C&I and CRE loans that became nonaccrual in the second quarter of 2020, partially offset by payoffs and charge-offs of C&I loans. Credit risk related to the C&I nonaccrual loans were partially mitigated by the collaterals in place. Nonaccrual loans as a percentage of loans held-for-investment were 0.48% and 0.35% as of June 30, 2020 and December 31, 2019, respectively. C&I nonaccrual loans were 47% and 62% of total nonaccrual loans as of June 30, 2020 and December 31, 2019, respectively. As of June 30, 2020, $58.7 million, or 33%, of the $178.8 million nonaccrual loans were less than 90 days delinquent. In comparison, $35.6 million or 30%, of the $120.2 million nonaccrual loans were less than 90 days delinquent as of December 31, 2019.

OREO increased by $19.4 million from $125 thousand as of December 31, 2019 to $19.5 million as of June 30, 2020 due to the Company taking possession of a retail CRE property located in Southern California in the first quarter of 2020.

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The following table presents the accruing loans past due by portfolio segments as of June 30, 2020 and December 31, 2019:

($ in thousands)												Total Accruing Past Due Loans (1)																		Change																		Percentage of Total Loans Outstanding
															June 30, 2020						December 31, 2019																											June 30, 2020						December 31, 2019
Commercial:
C&I												$	60,136					$	48,155					$	11,981					25		%				0.45		%				0.40		%
CRE:
CRE												8,727						24,807						(16,080)						(65)		%				0.08		%				0.24		%
Multifamily residential												5,963						729						5,234						718		%				0.20		%				0.03		%
Total CRE												14,690						25,536						(10,846)						(42)		%				0.10		%				0.19		%
Total commercial												74,826						73,691						1,135						2		%				0.27		%				0.29		%
Consumer:
Residential mortgage:
Single-family residential												20,691						20,517						174						1		%				0.27		%				0.29		%
HELOCs												2,938						7,064						(4,126)						(58)		%				0.20		%				0.48		%
Total residential mortgage												23,629						27,581						(3,952)						(14)		%				0.26		%				0.32		%
Other consumer												14,695						11						14,684						NM						8.05		%				0.00		%
Total consumer												38,324						27,592						10,732						39		%				0.41		%				0.31		%
Total												$	113,150					$	101,283					$	11,867					12		%				0.30		%				0.29		%

NM — Not meaningful.

(1)There were no accruing loans past due 90 days or more as of both June 30, 2020 and December 31, 2019.

Troubled Debt Restructurings

TDRs are loans for which contractual terms have been modified by the Company for economic or legal reasons related to a borrower’s financial difficulties, and for which a concession to the borrower was granted that the Company would not otherwise consider. Our loan modifications are handled on a case-by-case basis and are negotiated to achieve mutually agreeable terms that maximize loan collectability and meet the borrower’s financial needs. The Company has implemented various consumer and commercial loan modification programs to provide its borrowers relief from the economic impacts of COVID-19 that were not accounted for as TDRs. Existing TDRs that were subsequently modified in response to COVID-19 continue to be classified as TDRs. As of June 30, 2020, there were 14 TDRs totaling $29.3 million were provided subsequent modifications related to COVID-19.

The following table presents the performing and nonperforming TDRs by portfolio segments as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020																		December 31, 2019
									Performing TDRs						Nonperforming TDRs						Performing TDRs						Nonperforming TDRs
Commercial:
C&I						$	45,187					$	21,186					$	39,208					$	41,014
CRE:
CRE						5,112						348						5,177						11,503
Multifamily residential						3,316						223						3,644						229
Construction and land						19,692						—						19,691						—
Total CRE						28,120						571						28,512						11,732
Consumer:
Residential mortgage:
Single-family residential						6,684						1,260						7,346						1,098
HELOCs						2,809						716						2,832						722
Total residential mortgage						9,493						1,976						10,178						1,820
Total TDRs						$	82,800					$	23,733					$	77,898					$	54,566

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Performing TDRs were $82.8 million as of June 30, 2020, an increase of $4.9 million or 6% from $77.9 million as of December 31, 2019. This increase primarily reflected $26.7 million in newly designated C&I TDR loans, partially offset by paydowns and payoffs of existing C&I TDR loans. Nonperforming TDRs were $23.7 million as of June 30, 2020, a decrease of $30.8 million or 57% from $54.6 million as of December 31, 2019. This decrease primarily reflected $37.1 million in payoffs and paydowns of C&I loans, $11.1 million in the transfer of nonperforming CRE loans to OREO, partially offset by $17.2 million new designation of C&I non-performing TDR loans. The allowance for loan losses for TDRs was $1.6 million and $400 thousand as of June 30, 2020 and December 31, 2019, respectively. See Note 7 — Loans Receivable and Allowance for Loan Losses to the Consolidated Financial Statements in this Form 10-Q.

Loan Modifications Due to COVID-19

As of June 30, 2020, the Company provided $2.82 billion in COVID-19 related loan modifications that were not considered TDRs to consumer and commercial customers. The aging of loan modifications related to COVID-19 are frozen at the time of the modification. Interest income continues to be recognized over the contractual life of the loan. For more information related to the Company’s accounting policy on loan modifications related to COVID-19, see Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Form 10-Q.

Loan Modifications under Section 4013 CARES Act — The CARES Act includes a provision that permits a financial institution to elect to temporarily suspend TDR accounting under ASC Subtopic 310-40 in certain circumstances (“Section 4013 CARES Act”). To be eligible under section 4013, a loan modification must be (1) related to COVID-19; (2) executed on a loan that was not more than 30 days past due as of December 31, 2019; and (3) executed between March 1, 2020, and the earlier of (a) 60 days after the date of termination of the federal National Emergency or (b) December 31, 2020. The Company provided relief programs under Section 4013 CARES Act to 2,890 loans totaling $2.68 billion, none of which were on nonaccrual status as of June 30, 2020. The majority of Section 4013 loan modification programs offered by our Company were comprised of payment deferrals. As of June 30, 2020, 288 commercial loans totaling $1.46 billion, comprising 55% of outstanding loan balances under the Section 4013 payment deferral program were primarily on a three-month payment deferral program, comprising of either principal payment deferrals or a combination of principal and interest payment deferrals. The deferred payments for commercial loans are either repaid at contractual maturity or over the remaining contractual term of the loan. As of June 30, 2020, 2,590 consumer loans totaling $1.17 billion, comprising 44% of the outstanding loan balances under the payment deferral program, were primarily comprised of single-family residential loans with payment deferrals ranging between two to six months. The deferred payments for consumer loans are either repaid at contractual maturity, or repaid over six or 12 months. Section 4013 forbearance programs consisted of interest rate reductions and/or concessions. As of June 30, 2020, there were three CRE loans totaling $30.6 million under the Section 4013 forbearance programs.

Loan Modifications under Interagency Statement — In response to the loan modification provisions under the CARES Act, the federal banking regulators issued a revised interagency statement on April 7, 2020 that, in consultation with the Financial Accounting Standards Board (“FASB”), confirmed that for loans not subject to section 4013, short-term modifications (i.e. six months or less) made on a good faith basis in response to COVID-19 to borrowers who were current prior to any relief are not TDRs under ASC Subtopic 310-40. As of June 30, 2020, there were 293 loans totaling $143.0 million under the payment deferral program, comprising primarily of single-family residential loans, of which 90 single-family residential loans totaling $15.1 million were under the Federal Housing Finance Agency payment deferral program. The remaining $127.9 million loans primarily had a three-month payment deferral to be repaid either over six or 12 months. The majority of these loans were performing loans.

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The following table presents loan modifications in response to the COVID-19 pandemic, by modification types, portfolio segments, and accommodation categories as of June 30, 2020, none of which were classified as TDRs:

($ in thousands)						June 30, 2020
									Section 4013 CARES Act																		Interagency Statement																														Total
									Number of Loans						Outstanding Balance						Number of Loans						Outstanding Balance																		Number of Loans						Outstanding Balance
Modification type:
Payment Deferral
Commercial:
C&I						70						$	121,353					1						$	3,735																	71						$	125,088
CRE:
CRE						198						1,202,046						2						19,684																		200						1,221,730
Multifamily residential						26						102,176						—						—																		26						102,176
Construction and land						3						51,192						—						—																		3						51,192
Total CRE						227						1,355,414						2						19,684																		229						1,375,098
Total commercial						297						1,476,767						3						23,419																		300						1,500,186
Consumer:
Residential mortgage:
Single-family residential						2,127						1,000,092						277						116,395																		2,404						1,116,487
HELOCs						463						172,096						13						3,166																		476						175,262
Total residential mortgage						2,590						1,172,188						290						119,561																		2,880						1,291,749
Total consumer						2,590						1,172,188						290						119,561																		2,880						1,291,749
Total payment deferral						2,887						2,648,955						293						142,980																		3,180						2,791,935
Forbearance
Commercial:
CRE:
CRE						3						30,599						—						—																		3						30,599
Total CRE						3						30,599						—						—																		3						30,599
Total commercial						3						30,599						—						—																		3						30,599
Total forbearance						3						30,599						—						—																		3						30,599
Total						2,890						$	2,679,554					293						$	142,980																	3,183						$	2,822,534

Allowance for Credit Losses

Effective January 1, 2020, the Company adopted ASU 2016-13, Financial Instruments — Credit Losses that requires the measurement of the allowance for credit losses to be based on management’s best estimate of lifetime expected credit losses inherent in the Company’s relevant financial assets. The allowance for credit losses estimate uses various models and estimation techniques based on our historical loss experience, current borrower characteristics, current conditions, reasonable and supportable forecasts and other relevant factors. The adoption of the new accounting standard increased the allowance for loan losses by $125.2 million, and the allowance for unfunded credit commitments by $10.5 million, partially offset by an after-tax decrease to opening retained earnings of $98.0 million on January 1, 2020.

The Company’s methodology for determining the allowance for loan losses includes an estimate of expected credit losses on a collective basis for groups loans with similar risk characteristics and specific allowance for loans which are individually evaluated. For collectively evaluated loans, the Company uses quantitative models to forecast expected credit losses and these models consider historical credit loss experience, current market and economic conditions, and forecasted changes in market and economic conditions if such forecasts are considered reasonable and supportable. The Company also considers qualitative factors in determining the allowance for loan losses. Qualitative adjustments are used to capture characteristics in the portfolio that impact expected credit losses which are not fully captured within the Company’s expected credit loss models.

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In addition to the allowance for loan losses, the Company maintains an allowance for unfunded credit commitments. The Company has three general areas where it provides the allowance for unfunded credit commitments: recourse obligations for loans sold, letters of credit and unfunded lending commitments. The Company’s methodology for determining the allowance for unfunded lending commitments calculation uses the lifetime loss rates of the on-balance sheet commitment. Recourse obligations for loans sold and letters of credit use the weighted loss rates for the segment of individual credit.

The Company employs a disciplined process and methodology to establish its allowance for loan losses each quarter. The process for estimating the allowance for loan losses takes into consideration many factors, including historical and forecasted loss trends, loan-level credit quality ratings and loan-specific risk characteristics. In addition to regular quarterly reviews of the adequacy of the allowance for loan losses, the Company performs ongoing assessments of the risks inherent in the loan portfolio. Determining the appropriateness of the allowance for loan losses is complex and requires judgement by management about the effect of matters that are inherently uncertain.

The Company is committed to maintaining the allowance for loan losses at a level that is commensurate with the estimated inherent losses in the loan portfolio, including unfunded credit facilities. While the Company believes that the allowance for loan losses was appropriate as of June 30, 2020, future allowance levels may increase or decrease based on a variety of factors, including but not limited to, accounting standard and regulatory changes, loan growth, portfolio performance and general economic conditions. See Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies — New Accounting Pronouncements Adopted, Note 7 — Loans Receivables and Allowance for Loan Losses — Allowance for Loan Losses and Item 2. MD&A — Critical Accounting Policies and Estimates in this Form 10-Q for a description of the policies, methodologies and judgements used to determine the allowance for credit losses.

The following tables present a summary of activities in the allowance for loan losses for loans by portfolio segments for the second quarter and first half of 2020 and 2019:

($ in thousands)						Three Months Ended June 30, 2020
									Commercial																																										Consumer																														Total
									C&I						CRE																														Residential Mortgage																		Other Consumer
																		CRE						Multi-Family Residential						Construction and Land						Single- Family Residential						HELOCs
Allowance for loan losses, beginning of period						$	362,629					$	132,819					$	16,530					$	11,018					$	26,822					$	3,881					$	3,304					$	557,003
Provision for (reversal of) credit losses on loans			(a)			37,862						43,315						7,908						7,526						(1,667)						205						(849)						94,300
Gross charge-offs						(20,378)						(320)						—						—						—						(221)						(30)						(20,949)
Gross recoveries						602						226						620						7						159						2						93						1,709
Total net (charge-offs) recoveries						(19,776)						(94)						620						7						159						(219)						63						(19,240)
Foreign currency translation adjustments						8						—						—						—						—						—						—						8
Allowance for loan losses, end of period						$	380,723					$	176,040					$	25,058					$	18,551					$	25,314					$	3,867					$	2,518					$	632,071

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($ in thousands)						Three Months Ended June 30, 2019
									Commercial																																										Consumer																														Total
									C&I						CRE																														Residential Mortgage																		Other Consumer
																		CRE						Multi-Family Residential						Construction and Land						Single- Family Residential						HELOCs
Allowance for loan losses, beginning of period						$	189,757					$	39,224					$	19,169					$	22,349					$	35,759					$	7,401					$	4,235					$	317,894
Provision for (reversal of) credit losses on loans			(a)			26,140						(1,250)						58						173						(3,068)						(1,224)						(98)						20,731
Gross charge-offs						(11,745)						—						—						—						—						—						(14)						(11,759)
Gross recoveries						1,713						1,837						53						439						72						—						7						4,121
Total net (charge-offs) recoveries						(10,032)						1,837						53						439						72						—						(7)						(7,638)
Foreign currency translation adjustments						(362)						—						—						—						—						—						—						(362)
Allowance for loan losses, end of period						$	205,503					$	39,811					$	19,280					$	22,961					$	32,763					$	6,177					$	4,130					$	330,625

($ in thousands)						Six Months Ended June 30, 2020
									Commercial																																										Consumer																														Total
									C&I						CRE																														Residential Mortgage																		Other Consumer
																		CRE						Multi-Family Residential						Construction and Land						Single- Family Residential						HELOCs
Allowance for loan losses, beginning of period						$	238,376					$	40,509					$	22,826					$	19,404					$	28,527					$	5,265					$	3,380					$	358,287
Impact of ASU 2016-13 adoption						74,237						72,169						(8,112)						(9,889)						(3,670)						(1,798)						2,221						125,158
Allowance for loan losses, January 1, 2020						312,613						112,678						14,714						9,515						24,857						3,467						5,601						483,445
Provision for (reversal of) credit losses on loans			(a)			98,480						54,750						9,189						9,008						33						617						(3,121)						168,956
Gross charge-offs						(32,355)						(1,274)						—						—						—						(221)						(56)						(33,906)
Gross recoveries						2,177						9,886						1,155						28						424						4						94						13,768
Total net (charge-offs) recoveries						(30,178)						8,612						1,155						28						424						(217)						38						(20,138)
Foreign currency translation adjustments						(192)						—						—						—						—						—						—						(192)
Allowance for loan losses, end of period						$	380,723					$	176,040					$	25,058					$	18,551					$	25,314					$	3,867					$	2,518					$	632,071

($ in thousands)						Six Months Ended June 30, 2019
									Commercial																																										Consumer																														Total
									C&I						CRE																														Residential Mortgage																		Other Consumer
																		CRE						Multi-Family Residential						Construction and Land						Single- Family Residential						HELOCs
Allowance for loan losses, beginning of period						$	189,117					$	40,666					$	19,885					$	20,290					$	31,340					$	5,774					$	4,250					$	311,322
Provision for (reversal of) credit losses on loans			(a)			41,404						(2,914)						(939)						2,169						1,349						401						(99)						41,371
Gross charge-offs						(28,989)						—						—						—						—						—						(28)						(29,017)
Gross recoveries						3,964						2,059						334						502						74						2						7						6,942
Total net (charge-offs) recoveries						(25,025)						2,059						334						502						74						2						(21)						(22,075)
Foreign currency translation adjustments						7						—						—						—						—						—						—						7
Allowance for loan losses, end of period						$	205,503					$	39,811					$	19,280					$	22,961					$	32,763					$	6,177					$	4,130					$	330,625

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The following table presents a summary of activities in the allowance for unfunded credit commitments for the three and six months ended June 30, 2020 and 2019:

						Three Months Ended June 30,																		Six Months Ended June 30,
($ in thousands)						2020						2019						2020						2019
Unfunded credit facilities
Allowance for unfunded credit commitments, beginning of period						$	20,829					$	14,505					$	11,158					$	12,566
Impact of ASU 2016-13 adoption						—						—						10,457						—
Provision for (reversal of) credit losses on unfunded credit commitments			(b)			8,143						(1,486)						7,357						453
Allowance for unfunded credit commitments, end of period						$	28,972					$	13,019					$	28,972					$	13,019
Provision for credit losses			(a) + (b)			$	102,443					$	19,245					$	176,313					$	41,824

The following table presents the Company’s credit quality ratios for the second quarters and the first half of 2020 and 2019:

($ in thousands)						Three Months Ended June 30,																		Six Months Ended June 30,
									2020						2019						2020						2019
Average loans held-for-investment						$	37,139,949					$	32,981,161					$	36,146,736					$	32,699,380
Loans held-for-investment						37,229,412						$	33,730,377					$	37,229,412					$	33,730,377
Allowance for loan losses to loans held-for-investment						1.70		%				0.98		%				1.70		%				0.98		%
Annualized net charge-offs to average loans held-for-investment						0.21		%				0.09		%				0.11		%				0.14		%

As of June 30, 2020, the allowance for loan losses amounted to $632.1 million or 1.70% of loans held-for-investment, compared with $358.3 million or 1.03% and $330.6 million or 0.98% of loans held-for-investment as of December 31, 2019 and June 30, 2019, respectively. The quarter-over-quarter and year-over-year increases in allowance for loan losses were largely due to a combination of factors: deteriorating macroeconomic conditions and outlook as a result of the COVID-19 pandemic, which resulted in a provision for credit losses of $102.4 million and $176.3 million for the second quarter and first half of 2020, respectively, and the adoption of ASU 2016-13, which increased the allowance for loan losses by $125.2 million on January 1, 2020. Second quarter 2020 gross charge-offs were $20.9 million and were primarily from C&I loans, partially offset by gross recoveries of $1.7 million, resulting in net charge-offs of $19.2 million or annualized 0.21% of average loans held-for-investment. First half 2020 gross charge-offs were $33.9 million and were primarily from C&I loans, partially offset by recoveries of $13.8 million, primarily from CRE loans, resulting in net charge-offs of $20.1 million or annualized 0.11% of average loans held-for-investment. Charge-offs in C&I portfolio totaled $20.4 million and $32.4 million for the three and six months ended June 30, 2020, respectively. These primarily comprised of oil & gas loan charge-offs of $13.8 million and $25.7 million in these respective periods.

As previously discussed, the Company has implemented various consumer and commercial loan modification programs to provide its borrowers relief from the economic impacts of COVID-19. As of June 30, 2020, the Bank funded PPP loans for over 7,200 customers, with an outstanding loan balance totaling $1.75 billion. As these loans are 100% guaranteed by SBA, the Company expects that these loans will have zero expected loss. As a result, as of June 30, 2020, these loans had no related allowance for loan losses. Additionally, in consideration of the economic disruption caused by COVID-19, the Company offered temporary loan accommodations. In calculating the allowance, these loans were included in the general reserve in their corresponding loan categories. The Company further evaluated these loans and noted that no additional qualitative allowance was needed for the impact of the pandemic because the effects were captured through the forecast used by the models.

The allowance for unfunded credit commitments was $29.0 million as of June 30, 2020, compared with $11.2 million and $13.0 million as of December 31, 2019 and June 30, 2019, respectively. The Company believes that the allowance for loan losses as of June 30, 2020, December 31, 2019 and June 30, 2019 was adequate.

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        The following table presents an allocation of the allowance for loan losses by portfolio segment as of June 30, 2020 and December 31, 2019 (prior to the adoption of ASU 2016-13):

($ in thousands)						June 30, 2020																																										December 31, 2019
									Allowance Allocation						% of Allowance to Total Allowance						Loans as % of Total Loans						% of ACL to Loans						Allowance Allocation						% of Allowance to Total Allowance						Loans as % of Total Loans						% of ACL to Loans
Commercial:
C&I						$	380,723					60		%				36		%				2.84		%				$	238,376					67		%				35		%				1.96		%
CRE:
CRE						176,040						28		%				29		%				1.61		%				40,509						11		%				30		%				0.39		%
Multifamily residential						25,058						4		%				8		%				0.83		%				22,826						6		%				8		%				0.80		%
Construction and land						18,551						3		%				2		%				3.27		%				19,404						5		%				2		%				3.09		%
Total CRE						219,649						35		%				39		%				1.51		%				82,739						22		%				40		%				0.60		%
Consumer:
Residential mortgage:
Single-family residential						25,314						4		%				21		%				0.33		%				28,527						8		%				20		%				0.40		%
HELOCs						3,867						1		%				4		%				0.26		%				5,265						2		%				4		%				0.36		%
Total residential mortgage						29,181						5		%				25		%				0.32		%				33,792						10		%				24		%				0.39		%
Other consumer						2,518						0		%				0		%				1.38		%				3,380						1		%				1		%				1.19		%
Total						$	632,071					100		%				100		%				1.70		%				$	358,287					100		%				100		%				1.03		%

The allowance for loan losses increased $273.8 million or 76% from December 31, 2019, primarily driven by the impact of adopting ASU 2016-13 of $74.2 million in C&I and $72.2 million in CRE loans, as well as first half 2020 provision for C&I and CRE credit losses of $98.5 million and $54.8 million, respectively, mainly due to the significant deterioration in the economic outlook from the COVID-19 pandemic, partially offset by first half 2020 C&I gross charge-offs of $32.4 million, primarily from our oil & gas loan portfolio.

Upon adoption of ASU 2016-13, allowance for loan losses for PCD loans is determined using the same methodology as other loans held-for-investment. As of December 31, 2019, the Company had no allowance for loan losses against $222.9 million of PCI loans.

Liquidity Risk Management

Liquidity

Liquidity is a financial institution’s capacity to meet its deposit and other counterparties’ obligations as they come due, or to obtain adequate funding at a reasonable cost to meet those obligations. The objective of liquidity management is to manage the potential mismatch of asset and liability cash flows. Maintaining an adequate level of liquidity depends on the institution’s ability to efficiently meet both expected and unexpected cash flows, and collateral needs without adversely affecting daily operations or the financial condition of the institution. To achieve this objective, the Company analyzes its liquidity risk, maintains readily available liquid assets and utilizes diverse funding sources including its stable core deposit base.

The Board of Directors’ Risk Oversight Committee has primary oversight responsibility. At the management level, the Company’s Asset/Liability Committee (“ALCO”) sets the liquidity guidelines that govern the day-to-day active management of the Company’s liquidity position. The ALCO regularly monitors the Company’s liquidity status and related management processes, and provides regular reports to the Board of Directors. These liquidity management practices have allowed the Company to effectively manage the market stress that began in the first quarter of 2020 from the COVID-19 pandemic.

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Liquidity Risk — Liquidity Sources. The Company’s primary source of funding is from deposits generated by its banking business, which is relatively stable and low-cost. Total deposits amounted to $40.67 billion as of June 30, 2020, compared with $37.32 billion as of December 31, 2019. The Company’s loan-to-deposit ratio was 92% and 93% as of June 30, 2020 and December 31, 2019, respectively. In addition, the Company has access to various sources of wholesale funding, as well as borrowing capacity at the FHLB and FRB of San Francisco to sustain an adequate liquid asset portfolio, meet daily cash demands and allow management flexibility to execute its business strategy. Economic conditions and the stability of capital markets impact the Company’s access to and the cost of wholesale financing. The Company’s access to capital markets is also affected by the ratings received from various credit rating agencies. See Item 2 — MD&A — Balance Sheet Analysis — Deposits and Other Sources of Funds in this Form 10-Q for further detail related to the Company’s funding sources.

The Company’s liquid assets include cash and cash equivalents, interest-bearing deposits with banks, short-term resale agreements and AFS debt securities. The following table presents the Company’s liquid assets as of June 30, 2020 and December 31, 2019:

($ in thousands)						June 30, 2020																														December 31, 2019
									Encumbered						Unencumbered						Total						Encumbered						Unencumbered						Total
Cash and cash equivalents						$	—					$	4,533,502					$	4,533,502					$	—					$	3,261,149					$	3,261,149
Interest-bearing deposits with banks						—						531,591						531,591						—						196,161						196,161
Short-term resale agreements						—						700,000						700,000						—						400,000						400,000
AFS debt securities						745,163						3,139,411						3,884,574						479,432						2,837,782						3,317,214
Total						$	745,163					$	8,904,504					$	9,649,667					$	479,432					$	6,695,092					$	7,174,524

Unencumbered liquid assets totaled $8.90 billion and $6.70 billion as of June 30, 2020 and December 31, 2019, respectively. AFS debt securities included as part of liquidity sources are primarily comprised of mortgage-backed securities and debt securities issued by U.S. government agency and U.S. government-sponsored enterprises, U.S. Treasury securities, municipal securities and foreign bonds. The Company believes these AFS debt securities provide quick sources of liquidity to obtain financing, regardless of market conditions, through sale or pledging.

As a means of augmenting the Company’s liquidity, the Company maintains available borrowing capacity under secured borrowing lines with the FHLB and FRB, unsecured federal funds lines of credit with various correspondent banks, and several master repurchase agreements with major brokerage companies. The Company’s available borrowing capacity with the FHLB and FRB as of June 30, 2020, was $7.19 billion and $4.35 billion, respectively. Unencumbered loans and/or securities were pledged to the FHLB and FRB discount window as collateral. Eligibility of collateral is defined in guidelines from the FHLB and FRB and is subject to change at their discretion. The Bank’s unsecured federal funds lines of credit, subject to availability, totaled $1.00 billion with correspondent banks as of June 30, 2020. Estimated borrowing capacity from unpledged AFS debt securities totaled $2.78 billion as of June 30, 2020. In connection with the Company’s participation in the PPP under the CARES Act, the Company has the ability to pledge loans it has made under the SBA’s PPP program to the PPPLF and receive term funding matching the term of the pledged loans for the full balance of PPP loans held by the Company. As of June 30, 2020, the Company had drawn down $1.43 billion from the Federal Reserve PPPLF and had $343.6 million PPP loans available to be pledged as collateral to secure additional funding. In sum, the Company had available borrowing capacity of $15.66 billion as of June 30, 2020, and the Company believes that its liquidity sources are sufficient to meet all reasonably foreseeable short-term needs over the next 12 months.

Liquidity Risk — Liquidity for East West. East West’s primary source of liquidity is from cash dividends distributed by its subsidiary, East West Bank. The Bank is subject to various statutory and regulatory restrictions on its ability to pay dividends as discussed in Item 1. Business — Supervision and Regulation — Dividends and Other Transfers of Funds of the Company’s 2019 Form 10-K. During the first half of 2020 and 2019, the Bank paid total dividends of $511.0 million and $90.0 million to East West, respectively.

Liquidity Risk — Liquidity Stress Testing. Liquidity stress testing is performed at the Company level, as well as at the foreign subsidiary and foreign branch levels. Stress testing and scenario analysis are intended to quantify the potential impact of a liquidity event on the financial and liquidity position of the entity. These scenarios include assumptions about significant changes in key funding sources, market triggers and potential uses of funding and economic conditions in certain countries. In addition, Company specific events are incorporated into the stress testing. Liquidity stress tests are conducted to ascertain potential mismatches between liquidity sources and uses over a variety of time horizons, both immediate and longer term, and over a variety of stressed conditions. Given the range of potential stresses, the Company maintains a series of contingency funding plans on a consolidated basis and for individual entities.

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In response to recent developments relating to COVID-19, the Company is continuing to closely monitor the impact of the pandemic on its business. The uncertainty surrounding COVID-19 and in the financial service industry in general could potentially impact the liquidity of the Company. The prolonged strained economic, capital, credit and/or financial market conditions may expose the Company to liquidity risk. Nevertheless, the Company believes that the market conditions have shown signs of improvement after the Federal Reserve stepped in with a broad array of actions to stabilize financial markets and lower borrowing costs. As of June 30, 2020, the Company was not aware of any material commitments for capital expenditures in the foreseeable future and believes it has adequate liquidity resources to conduct operations and meet other needs in the ordinary course of business. Given the uncertainty and the rapidly changing market and economic conditions related to the COVID-19 pandemic, the Company will continue to actively evaluate the nature and extent of the impact of the COVID-19 pandemic on its business and financial position.

Consolidated Cash Flows Analysis

The following table presents a summary of the Company’s Consolidated Statement of Cash Flows for the periods indicated, which may be helpful to highlight business strategies and macro trends. In addition to this cash flow analysis, the discussion related to liquidity in Item 7. MD&A — Risk Management — Liquidity Risk Management — Liquidity may provide a more useful context in evaluating the Company’s liquidity position and related activity.

($ in thousands)						Six Months Ended June 30,
									2020						2019
Net cash provided by operating activities						$	270,916					$	290,001
Net cash used in investing activities						(3,510,613)						(997,151)
Net cash provided by financing activities						4,527,520						1,327,884
Effect of exchange rate changes on cash and cash equivalents						(15,470)						(497)
Net increase in cash and cash equivalents						1,272,353						620,237
Cash and cash equivalents, beginning of period						3,261,149						3,001,377
Cash and cash equivalents, end of period						$	4,533,502					$	3,621,614

Operating Activities — Net cash provided by operating activities was $270.9 million and $290.0 million for the first half of 2020 and 2019, respectively. During the first half of 2020 and 2019, net cash provided by operating activities mainly reflected inflows of $244.2 million and $314.4 million from net income, respectively. During the first half of 2020, net operating cash inflows also benefited from $228.3 million of noncash adjustments to reconcile net income to net operating cash, as well as $257.4 million of net changes in accrued expenses and other liabilities, partially offset by $456.4 million of net changes in accrued interest receivable and other assets. The $456.4 million of net changes in accrued interest receivable and other assets between June 30, 2020 and December 31, 2019 was primarily due to changes in derivative asset fair values. In comparison, during the same period in 2019, net operating cash inflows benefited from $113.6 million of noncash adjustments to reconcile net income to net operating cash, which was offset by $150.2 million of net changes in accrued interest receivable and other assets.

Investing Activities — Net cash used in investing activities was $3.51 billion and $997.2 million for the first half of 2020 and 2019, respectively. During the first half of 2020, net cash used in investing activities primarily reflected cash outflows of $2.48 billion from loans held-for-investment, $501.1 million from AFS debt securities, $315.5 million from interest-bearing deposits with banks and $150.0 million from resale agreements. The cash outflows from loans held-for-investment were primarily due to C&I, CRE and single-family residential loan growth during the first half of 2020. During the same period in 2019, net cash used in investing activities primarily reflected cash outflows of $1.35 billion from loans held-for-investment, partially offset by $222.4 million increase in interest-bearing deposits with banks and $175.7 million net decrease in AFS debt securities.

Financing Activities — Net cash provided by financing activities was $4.53 billion and $1.33 billion for the first half of 2020 and 2019, respectively. During the first half of 2020, net cash provided by financing activities primarily reflected net increases of $3.36 billion in deposits, $1.43 billion in PPPLF advances and $225.8 million in short-term borrowings, partially offset by $158.7 million in repayment of repurchase agreements and its extinguishment cost, $146.0 million in shares repurchased, $90.0 million net repayment of FHLB advances, and $80.3 million in cash dividends. During the same period in 2019, net cash provided by financing activities primarily reflected a $1.04 billion net increase in deposits and a $418.0 million net increase in FHLB advances, partially offset by cash dividends of $74.9 million and a $38.1 million decrease in short-term borrowings.

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Market Risk Management

Market risk is the risk that the Company’s financial condition may change resulting from adverse movements in market rates or prices including interest rates, foreign exchange rates, interest rate contracts, investment securities prices, credit spreads, and related risk resulting from mismatches in rate sensitive assets and liabilities. In the event of market stress, the risk could have a material impact on our results of financial condition.

The Board’s Risk Oversight Committee has primary oversight responsibility. At the management level, the ALCO establishes and monitors compliance with the policies and risk limits pertaining to market risk management activities. Corporate Treasury supports the ALCO in measuring, monitoring and managing interest rate risk as well as all other market risks.

Interest Rate Risk Management

Interest rate risk results primarily from the Company’s traditional banking activities of gathering deposits and extending loans, and is the primary market risk for the Company. Economic and financial conditions, movements in interest rates, and consumer preferences impact the level of noninterest-bearing funding sources at the Company, and affect the difference between the interest the Company earns on interest-earning assets and pays on interest-bearing liabilities. In addition, changes in interest rates can influence the rate of principal prepayments on loans and the speed of deposit withdrawals. Due to the pricing term mismatches and the embedded options inherent in certain products, changes in market interest rates not only affect expected near-term earnings, but also the economic value of these interest-earning assets and interest-bearing liabilities. Other market risks include foreign currency exchange risk and equity price risk. These risks are not considered significant to the Company and no separate quantitative information concerning these risks is presented herein.

With oversight by the Company’s Board of Directors, the ALCO coordinates the overall management of the Company’s interest rate risk. The ALCO meets regularly and is responsible for reviewing the Company’s open market positions and establishing policies to monitor and limit exposure to market risk. Management of interest rate risk is carried out primarily through strategies involving the Company’s investment securities portfolio, loan portfolio, available funding channels and capital market activities. In addition, the Company’s policies permit the use of derivative instruments to assist in managing interest rate risk.

The interest rate risk exposure is measured and monitored through various risk management tools, which include a simulation model that performs interest rate sensitivity analyses under multiple interest rate scenarios. The model incorporates the Company’s cash instruments, loans, debt securities, resale agreements, deposits, borrowings and repurchase agreements, as well as financial instruments from the Company’s foreign operations. The Company incorporates both a static balance sheet and a forward growth balance sheet in order to perform these analyses. The simulated interest rate scenarios include a non-parallel shift in the yield curve (“rate shock”) and a gradual non-parallel shift in the yield curve (“rate ramp”). In addition, the Company also performs simulations using alternative interest rate scenarios, including various permutations of the yield curve flattening, steepening or inverting. Results of these various simulations are used to formulate and gauge strategies to achieve a desired risk profile within the Company’s capital and liquidity guidelines.

The net interest income simulation model is based on the actual maturity and re-pricing characteristics of the Company’s interest-rate sensitive assets, liabilities and related derivative contracts. It also incorporates various assumptions, which management believes to be reasonable but may have a significant impact on results. These assumptions include, but are not limited to, the timing and magnitude of changes in interest rates, the yield curve evolution and shape, the correlation between various interest rate indices, financial instrument future repricing characteristics and spread relative to benchmark rates, and the effect of interest rate floors and caps. The modeled results are highly sensitive to deposit decay and deposit beta assumptions, derived from a regression analysis of the Company’s historical deposit data. Deposit beta commonly refers to the correlation of the change in interest rates paid on deposits to changes in benchmark market interest rates. The model is also sensitive to the loan and investment prepayment assumptions, based on an independent model and the Company’s historical prepayment data, which consider anticipated prepayments under different interest rate environments.

Simulation results are highly dependent on input assumptions. To the extent actual behavior is different from the assumptions in the models, there could be a material change in interest rate sensitivity. The assumptions applied in the model are documented and supported for reasonableness, and periodically back-tested to assess their effectiveness. The Company makes appropriate calibrations to the model as needed, continually refining the model, methodology and results. Changes to key model assumptions are reviewed by the ALCO. Scenario results do not reflect strategies that management could employ to limit the impact of changing interest rate expectations.

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As the federal funds target rate range has been lowered to near zero to between 0.00% and 0.25% in March 2020 and the Federal Reserve has committed its resources to support the financial markets, business, and state and local governments, it is not expected that rates can decline further, or into the negative territory. Consequently, the simulation results for the downward interest rate scenarios as of June 30, 2020 are not provided.

Twelve-Month Net Interest Income Simulation

Net Interest Income simulation modeling looks at interest rate risk through earnings. It projects the changes in interest rate sensitive asset and liability cash flows, expressed in terms of net interest income, over a specified time horizon for defined interest rates scenarios. Net interest income simulations generate insight into the impact of market rates changes on earnings and guide risk management decisions. The Company assesses interest rate risk by comparing net interest income using different interest rate scenarios.

The following table presents the Company’s net interest income sensitivity related to an instantaneous and sustained non-parallel shift in market interest rates of 100 and 200 basis points in upward direction as of June 30, 2020 and in both directions as of December 31, 2019.

Change in Interest Rates (Basis Points)						Net Interest Income Volatility (1)(2)
									June 30, 2020						December 31, 2019
+200						14.6		%				13.2		%
+100						6.7		%				6.7		%
-100						NM						(5.5)		%
-200						NM						(8.7)		%

(1)The percentage change represents net interest income over 12 months in a stable interest rate environment versus net interest income in the various rate scenarios.

(2)NM — Not meaningful.

The Company’s estimated twelve-month net interest income sensitivity as of June 30, 2020 was higher when compared with the sensitivity as of December 31, 2019, for the upward 200 basis point rate scenario, while the sensitivity remained unchanged for the upward 100 basis point rate scenario. This reflects a greater rate of upward repricing in the Company’s rate sensitive assets, which offsets simulated increases in interest expense from higher rates on deposits. While there has been an increase in the population of floating rate loans that are currently at their floors under the current low interest rate environment, an increase in the cash and cash equivalents along with an increase in non-interest bearing deposits and the reduction in the base case twelve-month net interest income were the primary drivers for the increased the interest rate sensitivity under the upward interest rate scenarios.

The Company’s net interest income profile as of June 30, 2020 reflects an asset sensitive position. Net interest income would be expected to increase if interest rates rise and to decrease if interest rates decline, albeit the federal funds rate is floored at the target range between 0.00% and 0.25%. The Company is naturally asset sensitive due to the large share of variable rate loans in its loan portfolio, which are primarily linked to Prime and LIBOR indices. The Company’s interest income is vulnerable to changes in short-term interest rates. The Company’s deposit portfolio is primarily comprised of non-maturity deposits, which are not directly tied to short-term interest rate indices, but are, nevertheless, sensitive to changes in short-term interest rates.

The federal funds target rate was between 0.00% and 0.25% as of June 30, 2020 and between 1.50% and 1.75% as of December 31, 2019. After cutting the rate to a range of between 0.00% and 0.25% in March 2020, the Federal Open Market Committee pledged to maintain monetary support and planned to leave interest rates unchanged through 2022 in order to support the markets, which continued to be strained from the impact of the COVID-19 pandemic.

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While an instantaneous and sustained non-parallel shift in market interest rates was used in the simulation model described in the preceding paragraphs, the Company believes that any shift in interest rates would likely be more gradual and would therefore have a more modest impact. The rate ramp table below shows the net income volatility under a gradual non-parallel shift upward and downward of the yield curve in even quarterly increments over the first twelve months, followed by rates held constant thereafter:

Change in Interest Rates (Basis Points)						Net Interest Income Volatility (1)(2)
									June 30, 2020						December 31, 2019
+200 Rate Ramp						5.7		%				6.0		%
+100 Rate Ramp						2.7		%				3.0		%
-100 Rate Ramp						NM						(2.6)		%
-200 Rate Ramp						NM						(5.1)		%

(1)The percentage change represents net interest income under a gradual non-parallel shift in even quarterly increments over 12 months.

(2)NM — Not meaningful.

The Company believes that the rate ramp table, shown above, when evaluated together with the results of the rate shock simulation, presents a better indication of the potential impact to the Company’s twelve-month net interest income in a rising and falling rate scenario. Between June 30, 2020 and December 31, 2019, the Company’s modeled sensitivity slightly decreased under a ramp simulation under the upward interest rate scenarios.

Economic Value of Equity at Risk

Economic value of equity (“EVE”) is a cash flow calculation that takes the present value of all asset cash flows and subtracts the present value of all liability cash flows. This calculation is used for asset/liability management and measures changes in the economic value of the bank. The fair market values of a bank's assets and liabilities are directly linked to interest rates. In some ways, the economic value approach provides a broader scope than the net income volatility approach since it captures all anticipated cash flows.

EVE simulation reflects the effect of interest rate shifts on the value of the Company and is used to assess the degree of interest rate risk exposure. In contrast to the earnings perspective, the economic perspective identifies risks arising from repricing or maturity gaps for the life of the balance sheet. Changes in economic value indicate anticipated changes in the value of the bank’s future cash flows. Thus, the economic perspective can provide a leading indicator of the bank’s future earnings and capital values. The economic valuation method also reflects those sensitivities across the full maturity spectrum of the bank’s assets and liabilities.

The following table presents the Company’s EVE sensitivity related to an instantaneous and sustained non-parallel shift in market interest rates of 100 and 200 basis points in an upward direction as of June 30, 2020 and in both directions as of December 31, 2019:

Change in Interest Rates (Basis Points)						EVE Volatility (1)(2)
									June 30, 2020						December 31, 2019
+200						12.8		%				7.0		%
+100						6.4		%				3.6		%
-100						NM						(1.4)		%
-200						NM						(3.5)		%

(1)The percentage change represents net portfolio value of the Company in a stable interest rate environment versus net portfolio value in the various rate scenarios.

(2)NM — Not meaningful.

The Company’s EVE sensitivity for the upward interest rate scenarios increased as of June 30, 2020 compared with the results as of December 31, 2019. The changes in EVE sensitivity during this period were primarily due to the reduced base EVE and the changes in level and shape of the yield curve.

The Company’s EVE profile as of June 30, 2020 reflects an asset sensitive EVE position under the upward interest rate scenarios. Given the uncertainty of the magnitude, timing and direction of future interest rate movements, and the shape of the yield curve, actual results may vary from those predicted by the Company’s model.

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Derivatives

It is the Company’s policy not to speculate on the future direction of interest rates, foreign currency exchange rates and commodity prices. However, the Company will, from time to time, enter into derivative transactions in order to reduce its exposure to market risks, primarily interest rate risk and foreign currency risk. The Company believes that these derivative transactions, when properly structured and managed, may provide a hedge against inherent risk in certain assets and liabilities and against risk in specific transactions. Hedging transactions may be implemented using a variety of derivative instruments such as swaps, forwards and options. Prior to entering into any hedging activities, the Company analyzes the costs and benefits of the hedge in comparison to alternative strategies. In addition, the Company enters into derivative transactions in order to assist customers with their risk management objectives, primarily to manage exposures to fluctuations in interest rates, foreign currencies and commodity prices. To economically hedge against the derivative contracts entered into with the Company’s customers, the Company enters into mirrored derivative contracts with third-party financial institutions. The exposures from derivative transactions are collateralized by cash and/or eligible securities based on limits as set forth in the respective agreements entered between the Company and the financial institutions.

The Company is subject to credit risk associated with the counterparties to the derivative contracts. This counterparty credit risk is a multidimensional form of risk, affected by both the exposure and credit quality of the counterparty, both of which are sensitive to market-induced changes. The Company’s Credit Risk Management Committee provides oversight of credit risks and the Company has guidelines in place to manage counterparty concentration, tenor limits and collateral. The Company manages the credit risk of its derivative positions by diversifying its positions among various counterparties, entering into legally enforceable master netting arrangements and requiring collateral arrangements, where possible. The Company may also transfer counterparty credit risk related to interest rate swaps to institutional third parties through the use of credit risk participation agreements (“RPAs”). Certain derivative contracts are required to be centrally cleared through clearinghouses to further mitigate counterparty credit risk. The Company incorporates credit value adjustments and other market standard methodologies to appropriately reflect its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements of its derivatives.

Fair Value Hedges — The Company had one and two cancellable interest rate swap contracts as of June 30, 2020 and December 31, 2019, respectively, with original terms of 20 years each. These swap contracts involve the exchange of variable rate payments over the life of the agreements without the exchange of the underlying notional amounts. The changes in fair value of the hedged brokered certificates of deposit are expected to be effectively offset by the changes in fair value of the swaps throughout the terms of these contracts.

Cash Flow Hedges — As of June 30, 2020, the Company entered into two interest rate swap contracts designated to hedge against the risk of variable cash flow that the Company is exposed to from its variable interest rate borrowings, including FRB discount window borrowing and FHLB advances. For cash flow hedges, the entire change in the fair value of the hedging instruments is recognized in AOCI and reclassified to earnings in the same period during which the hedged cash flows impact earnings.

Net Investment Hedges — ASC 830-20, Foreign Currency Matters — Foreign Currency Transactions and ASC 815, Derivatives and Hedging, allow hedging of the foreign currency risk of a net investment in a foreign operation. The Bank entered into foreign currency forward contracts to hedge its investment in East West Bank (China) Limited, a non-U.S. dollar (“USD”) functional currency subsidiary in China. The hedging instruments designated as net investment hedges, involve hedging the risk of changes in the U.S. dollar equivalent value of a designated monetary amount of the Company’s net investment in East West Bank (China) Limited, against the risk of adverse changes in the foreign currency exchange rate of the Chinese Renminbi (“RMB”). As of June 30, 2020, the outstanding foreign currency forwards effectively hedged approximately 50% of the RMB exposure in East West Bank (China) Limited. The fluctuation in foreign currency translation of the hedged exposure is expected to be offset by changes in the fair value of the forwards.

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Interest Rate Contracts — The Company offers various interest rate derivative contracts to its customers. When derivative transactions are executed with its customers, the derivative contracts are offset by paired trades with third-party financial institutions including with central clearing organizations. Certain derivative contracts entered with central clearing organizations are settled-to-market daily to the extent the central clearing organizations’ rulebooks legally characterize the variation margin as settlement. Derivative contracts allow borrowers to lock in attractive intermediate and long-term fixed rate financing while not increasing the interest rate risk to the Company. These transactions are not linked to specific Company assets or liabilities on the Consolidated Balance Sheet or to forecasted transactions in a hedging relationship and, therefore, are economic hedges. The contracts are marked-to-market at each reporting period. The changes in fair values of the derivative contracts traded with third-party financial institutions are expected to be largely comparable to the changes in fair values of the derivative transactions executed with customers throughout the terms of these contracts, except for the credit valuation adjustment component. The Company records credit valuation adjustments on derivatives to properly reflect the variances of credit worthiness between the Company and the counterparties, considering the effects of enforceable master netting agreements and collateral arrangements.

Foreign Exchange Contracts — The Company enters into foreign exchange contracts with its customers, consisting of forward, spot, swap and option contracts to accommodate the business needs of its customers. For the foreign exchange contracts entered into with its customers, the Company managed its foreign exchange exposure by entering into offsetting foreign exchange contracts with third-party financial institutions and/or entering into bilateral collateral and master netting agreements with customer counterparties to manage its credit exposure. The changes in the fair values entered with third-party financial institutions are expected to be largely comparable to the changes in fair values of the foreign exchange transactions executed with the customers throughout the terms of these contracts. The Company also utilizes foreign exchange contracts that are not designated as hedging instruments to mitigate the economic effect of fluctuations in certain foreign currency on-balance sheet assets and liabilities, primarily foreign currency denominated deposits offered to its customers. The Company’s policies permit taking proprietary currency positions within approved limits, in compliance with the proprietary trading exemption provided under Section 619 of the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”). The Company does not speculate in the foreign exchange markets, and actively manages its foreign exchange exposures within prescribed risk limits and defined controls.

Credit Contracts — The Company may periodically enter into RPAs to manage the credit exposure on interest rate contracts associated with its syndicated loans. The Company may enter into protection sold or protection purchased RPAs with institutional counterparties. Under the RPA, the Company will receive or make a payment if a borrower defaults on the related interest rate contract. The Company manages its credit risk on the RPAs by monitoring the credit worthiness of the borrowers, which is based on the Company’s normal credit review process.

Equity Contracts — As part of the loan origination process, from time to time, the Company obtained warrants to purchase preferred and/or common stock of technology and life sciences companies to which it provides loans. The warrants included on the Consolidated Financial Statements were from public and private companies.

Commodity Contracts — The Company entered into energy commodity contracts with its customers to allow them to hedge against the risk of fluctuation in energy commodity prices. To economically hedge against the risk of fluctuation in commodity prices in the products offered to its customers, the Company enters into offsetting commodity contracts with third-party financial institutions including with central clearing organizations. Certain derivative contracts entered with central clearing organizations are settled to market daily to the extent the central clearing organizations’ rulebooks legally characterize the variation margin as settlement. The changes in fair values of the energy commodity contracts traded with third-party financial institutions are expected to be largely comparable to the changes in fair values of the energy commodity transactions executed with customers throughout the terms of these contracts.

Additional information on the Company’s derivatives is presented in Note 1 — Summary of Significant Accounting Policies — Derivatives to the Consolidated Financial Statements of the Company’s 2019 Form 10-K, Note 3 — Fair Value Measurement and Fair Value of Financial Instruments and Note 6 — Derivatives to the Consolidated Financial Statements of this Form 10-Q.

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Impact of Inflation

The consolidated financial statements and related financial data presented in this report have been prepared according to GAAP, which require the measurement of financial and operating results in terms of historical dollars without considering the change in the relative purchasing power of money over time due to inflation. The primary impact of inflation on our operations is reflected in increased operating costs and the effect that inflation may have on both short-term and long-term interest rates. Since almost all the assets and liabilities of a financial institution are monetary in nature, interest rates generally have a more significant impact on a financial institution's performance than do general levels of inflation. While inflation expectations do affect interest rates, interest rates do not necessarily move in the same direction or to the same extent as the prices of goods and services.

Critical Accounting Policies and Estimates

The Company’s significant accounting policies and use of estimates are fundamental to understanding its results of operations and financial condition. Some accounting policies, by their nature, are inherently subject to estimation techniques, valuation assumptions and other subjective assessments. In addition, some significant accounting policies require significant judgments in applying complex accounting principles to individual transaction and determining the most appropriate treatment. The Company has procedures and processes in place to facilitate making these judgments. For significant accounting policies and use of estimates of allowance for credit losses, see Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies in this Form 10-Q; and for all other significant accounting policies and use of estimates, see Note 1 — Summary of Significant Accounting Policies of the Company’s 2019 Form 10-K.

Certain accounting policies are considered to have a critical effect on the Company’s Consolidated Financial Statements in the Company’s judgment. Critical accounting policies are defined as those that require the most complex or subjective judgments and are reflective of significant uncertainties, and whose actual results could differ from the Company’s estimates. Future changes in the key variables could change future valuations and impact the results of operations. In each area, the Company has identified the most important variables in the estimation process. The Company has used the best information available to make the estimations necessary for the related assets and liabilities. The following accounting policies are critical to the Company’s Consolidated Financial Statements as they require management to make subjective and complex judgments about matters that are inherently uncertain where actual results could differ materially from the Company’s estimates:

•fair value of financial instruments;

•allowance for credit losses;

•goodwill impairment; and

•income taxes.

Recently Issued Accounting Standards

For detailed discussion and disclosure on new accounting pronouncements adopted and recent accounting pronouncements issued, see Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Form 10-Q.

Supplemental Information — Explanation of GAAP to Non-GAAP Financial Measures

To supplement the Company’s unaudited interim Consolidated Financial Statements presented in accordance with GAAP, the Company uses certain non-GAAP measures of financial performance. Non-GAAP financial measures are not in accordance with, or an alternative to GAAP. Generally, a non-GAAP financial measure is a numerical measure of a company’s performance that either excludes or includes amounts that are not normally excluded or included in the most directly comparable measure calculated and presented in accordance with GAAP. A non-GAAP financial measure may also be a financial metric that is not required by GAAP or other applicable requirement. The Company believes these non-GAAP financial measures, when taken together with the corresponding GAAP financial measures, provide meaningful supplemental information regarding its performance, and allow comparability to prior periods. These non-GAAP financial measures may be different from non-GAAP financial measures used by other companies, limiting their usefulness for comparison purposes.

During the second quarter of 2020, the Company prepaid $150.0 million of repurchase agreements and incurred a debt extinguishment cost of $8.7 million. During the first and second quarters of 2019, the Company recorded a $7.0 million pre-tax impairment charge and reversed $30.1 million of certain previously claimed tax credits related to DC Solar, respectively.

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The following tables present the reconciliations of GAAP to non-GAAP financial measures for the periods presented:

($ and shares in thousands, except per share data)									Three Months Ended June 30,																		Six Months Ended June 30,
															2020						2019						2020						2019
Net income			(a)						$	99,352					$	150,380					$	244,176					$	314,404
Add: Impairment charge related to DC Solar (1)									—						—						—						6,978
Tax effect of adjustments (2)									—						—						—						(2,063)
Add: Reversal of certain previously claimed tax credits related to DC Solar									—						30,104						—						30,104
Non-GAAP net income			(b)						$	99,352					$	180,484					$	244,176					$	349,423
Diluted weighted-average number of shares outstanding									141,827						146,052						143,560						146,016
Diluted EPS									$	0.70					$	1.03					$	1.70					$	2.15
Diluted EPS impact of impairment charge related to DC Solar, net of tax									—						—						—						0.03
Diluted EPS impact of reversal of certain previously claimed tax credits related to DC Solar									—						0.21						—						0.21
Non-GAAP diluted EPS									$	0.70					$	1.24					$	1.70					$	2.39
Average total assets			(c)						$	48,228,914					$	41,545,441					$	46,492,211					$	41,144,152
Average stockholders’ equity			(d)						$	4,982,446					$	4,684,348					$	5,002,226					$	4,611,231
ROA (3)			(a)/(c)						0.83		%				1.45		%				1.06		%				1.54		%
Non-GAAP ROA (3)			(b)/(c)						0.83		%				1.74		%				1.06		%				1.71		%
ROE (3)			(a)/(d)						8.02		%				12.88		%				9.82		%				13.75		%
Non-GAAP ROE (3)			(b)/(d)						8.02		%				15.45		%				9.82		%				15.28		%

(1)Included in Amortization of tax credit and other investments on the Consolidated Statement of Income.

(2)Applied statutory rate of 29.56% for the three and six months ended June 30, 2019.

(3)Annualized.

($ in thousands)									Three Months Ended June 30,																		Six Months Ended June 30,
															2020						2019						2020						2019
Income tax expense			(a)						$	12,921					$	72,797					$	32,107					$	103,864
Less: Reversal of certain previously claimed tax credit related to DC Solar			(b)						—						(30,104)						—						(30,104)
Non-GAAP income tax expense			(c)						$	12,921					$	42,693					$	32,107					$	73,760
Income before income taxes			(d)						112,273						$	223,177					$	276,283					$	418,268
Effective tax rate			(a)/(d)						11.51		%				32.62		%				11.62		%				24.83		%
Less: Reversal of certain previously claimed tax credit related to DC Solar			(b)/(d)						—		%				(13.49)		%				—		%				(7.20)		%
Non-GAAP effective tax rate			(c)/(d)						11.51		%				19.13		%				11.62		%				17.63		%

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($ in thousands)									Three Months Ended June 30,																		Six Months Ended June 30,
															2020						2019						2020						2019
Net interest income before provision for credit losses			(a)						$	343,775					$	367,326					$	706,482					$	729,787
Total noninterest income									58,637						52,759						112,686						94,890
Total revenue			(b)						$	402,412					$	420,085					$	819,168					$	824,677
Total noninterest expense			(c)						$	187,696					$	177,663					$	366,572					$	364,585
Less: Amortization of tax credit and other investments									(24,759)						(16,739)						(42,084)						(41,644)
Amortization of core deposit intangibles									(931)						(1,152)						(1,884)						(2,326)
Repurchase agreements’ extinguishment cost									(8,740)						—						(8,740)						—
Non-GAAP noninterest expense			(d)						$	153,266					$	159,772					$	313,864					$	320,615
Efficiency ratio			(c)/(b)						46.64		%				42.29		%				44.75		%				44.21		%
Non-GAAP efficiency ratio			(d)/(b)						38.09		%				38.03		%				38.31		%				38.88		%

($ and shares in thousands, except per share data)									June 30, 2020						March 31, 2020						June 30, 2019
Stockholders’ equity			(a)						$	4,987,243					$	4,902,985					$	4,734,593
Less: Goodwill									(465,697)						(465,697)						(465,697)
Other intangible assets (1)									(13,490)						(14,769)						(18,952)
Non-GAAP tangible common equity			(b)						$	4,508,056					$	4,422,519					$	4,249,944
Number of common shares at period-end			(c)						141,486						141,435						145,547
Non-GAAP tangible common equity per share			(b)/(c)						$	31.86					$	31.27					$	29.20

(1)Includes core deposit intangibles and mortgage servicing assets.

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Forward-Looking Statements

Certain matters discussed in this Form 10-Q contains certain forward-looking information about us that is intended to be covered by the safe harbor for “forward-looking statements” provided by the Private Securities Litigation Reform Act of 1995. Forward-looking statements are statements that are not historical facts, and are based on current expectations, estimates and projections about the Company’s industry, management’s beliefs and certain assumptions made by management, many of which, by their nature, are inherently uncertain and beyond the Company’s control, particularly with regard to developments related to COVID-19. These statements relate to the Company’s financial condition, results of operations, plans, objectives, future performance or business. They usually can be identified by the use of forward-looking language, such as “likely result in,” “expects,” “anticipates,” “estimates,” “forecasts,” “projects,” “intends to,” “assumes,” or may include other similar words or phrases, such as “believes,” “plans,” “trend,” “objective,” “continues,” “remains,” or similar expressions, or future or conditional verbs, such as “will,” “would,” “should,” “could,” “may,” “might,” “can,” or similar verbs, and the negative thereof. You should not place undue reliance on these statements, as they are subject to risks and uncertainties, including, but not limited to, those described in the documents incorporated by reference. When considering these forward-looking statements, you should keep in mind these risks and uncertainties, as well as any cautionary statements the Company may make. Moreover, you should treat these statements as speaking only as of the date they are made and based only on information then actually known to the Company.

There are a number of important factors that could cause future results to differ materially from historical performance and these forward-looking statements. Factors that might cause such differences, some of which are beyond the Company’s control, include, but are not limited to

•the impact of disease pandemics, such as the worldwide spread of COVID-19, on the Company, its operations and its customers, employees and the markets in which the Company operates and in which its loans are concentrated; and the measures that international, federal, state and local governments, agencies, law enforcement and/or health authorities implement to address it, which may precipitate or exacerbate one or more of the below-mentioned and/or other risks, and significantly disrupt or prevent the Company from operating its business in the ordinary course for an extended period;

•changes in governmental policy and regulation, including measures taken in response to economic, business, political and social conditions, such as the SBA’s PPP, the Federal Reserve efforts to provide liquidity to the U.S. financial system, including changes in government interest rate policies, and to provide credit to private commercial and municipal borrowers, and other programs designed to address the effects of the COVID-19 pandemic, as well as the resulting effect of all such items on the Company’s operations, liquidity and capital position, and on the financial condition of the Company’s borrowers and other customers;

•changes in the U.S. economy, including an economic slowdown or recession, inflation, deflation, employment levels, rate of growth and general business conditions;

•the changes and effects thereof in trade, monetary and fiscal policies and laws, including the ongoing trade dispute between the U.S. and the People’s Republic of China;

•fluctuations in the Company’s stock price;

•changes in income tax laws and regulations;

•the Company’s ability to compete effectively against other financial institutions in its banking markets;

•success and timing of the Company’s business strategies;

•the Company’s ability to retain key officers and employees;

•impact on the Company’s funding costs, net interest income and net interest margin from changes in key variable market interest rates, competition, regulatory requirements and the Company’s product mix;

•changes in the Company’s costs of operation, compliance and expansion;

•the Company’s ability to adopt and successfully integrate new technologies into its business in a strategic manner;

•impact of benchmark interest rate reform in the U.S. that resulted in the SOFR selected as the preferred alternative reference rate to the LIBOR;

•impact of failure in, or breach of, the Company’s operational or security systems or infrastructure, or those of third parties with whom the Company does business, including as a result of cyber-attacks; and other similar matters which could result in, among other things, confidential and/or proprietary information being disclosed or misused;

•adequacy of the Company’s risk management framework, disclosure controls and procedures and internal control over financial reporting;

•future credit quality and performance, including the Company’s expectations regarding future credit losses and allowance levels;

•impact of adverse changes to the Company’s credit ratings from major credit rating agencies;

•impact of adverse judgments or settlements in litigation;

•changes in the commercial and consumer real estate markets;

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•changes in consumer spending and savings habits;

•impact on the Company’s international operations due to political developments, disease pandemics, wars or other hostilities that may disrupt or increase volatility in securities or otherwise affect economic conditions;

•changes in laws or the regulatory environment including regulatory reform initiatives and policies of the U.S. Department of Treasury, the Federal Reserve, the Federal Deposit Insurance Corporation, the Office of the Comptroller of the Currency, the SEC, the Consumer Financial Protection Bureau and the California Department of Business Oversight - Division of Financial Institutions;

•impact of the Dodd-Frank Act on the Company’s business, business practices, cost of operations and executive compensation;

•heightened regulatory and governmental oversight and scrutiny of the Company’s business practices, including dealings with consumers;

•impact of reputational risk from negative publicity, fines and penalties and other negative consequences from regulatory violations and legal actions and from the Company’s interactions with business partners, counterparties, service providers and other third parties;

•impact of regulatory enforcement actions;

•changes in accounting standards as may be required by the FASB or other regulatory agencies and their impact on critical accounting policies and assumptions;

•impact of other potential federal tax changes and spending cuts;

•the Company’s capital requirements and its ability to generate capital internally or raise capital on favorable terms;

•impact on the Company’s liquidity due to changes in the Company’s ability to receive dividends from its subsidiaries;

•any future strategic acquisitions or divestitures;

•continuing consolidation in the financial services industry;

•changes in the equity and debt securities markets;

•fluctuations in foreign currency exchange rates;

•a recurrence of significant turbulence or disruption in the capital or financial markets, which could result in, among other things, a reduction in the availability of funding or increases in funding costs, a reduction in investor demand for mortgage loans and declines in asset values and/or recognition of OTTI on securities held in the Company’s AFS debt securities portfolio; and

•impact of natural or man-made disasters or calamities, such as wildfires, or conflicts or other events that may directly or indirectly result in a negative impact on the Company’s financial performance.

In addition to the risk factors enumerated above, the economic impact of the COVID-19 pandemic could cause actual outcome to differ, possibly materially, from the Company’s forward-looking statements due to factors and future developments that are uncertain, unpredictable and in many cases beyond the Company’s control. Given the ongoing and dynamic nature of the circumstances, it is difficult to predict the full impact of the COVID-19 pandemic on the Company’s business. The extent to which the COVID-19 pandemic impacts the Company will depend on future developments that are uncertain and unpredictable, including the scope, severity and duration of the pandemic and its impact on the Company’s customers, the actions taken by governmental authorities in response to the pandemic as well as its impact on global and regional economies, and the pace of recovery when the COVID-19 pandemic subsides, among others.

For a more detailed discussion of some of the factors that might cause such differences, see the Company’s 2019 Form 10-K under the heading Item 1A. Risk Factors and the information set forth under Item 1A. Risk Factors in this Form 10-Q. The Company does not undertake, and specifically disclaims any obligation to update or revise any forward-looking statements to reflect the occurrence of events or circumstances after the date of such statements except as required by law.

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ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

        For quantitative and qualitative disclosures regarding market risk in the Company’s portfolio, see Item 1. Consolidated Financial Statements — Note 6 — Derivatives and Item 2. MD&A — Risk Management — Market Risk Management in Part I of this Form 10-Q.

ITEM 4. CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

As of June 30, 2020, pursuant to Rule 13a-15(b) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), the Company conducted an evaluation, under the supervision and with the participation of the Company’s management, including the Chief Executive Officer and Chief Financial Officer, of the effectiveness of the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) of the Exchange Act). Based upon that evaluation, the Company’s Chief Executive Officer and Chief Financial Officer concluded that the Company’s disclosure controls and procedures were effective as of June 30, 2020.

The Company’s disclosure controls and procedures are designed to ensure that information required to be disclosed by the Company in the reports that the Company files or submits under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the rules and forms of the SEC. The Company’s disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by the Company in the reports that the Company files under the Exchange Act is accumulated and communicated to the Company’s management, including the Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

Change in Internal Control over Financial Reporting

There were no changes in the Company’s internal control over financial reporting (as defined in Rule 13a-15(f) of the Exchange Act) during the quarter ended June 30, 2020, that have materially affected or are reasonably likely to materially affect the Company’s internal control over financial reporting.

119

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PART II — OTHER INFORMATION

ITEM 1.  LEGAL PROCEEDINGS

See Item 1. Consolidated Financial Statements — Note 10 — Commitments and Contingencies — Litigation in Part I of this report, incorporated herein by reference.

ITEM 1A.  RISK FACTORS

In addition to the risk factor set forth below and the information set forth in this Form 10-Q, you should carefully consider the disclosure regarding the risks and uncertainties related to the Company’s business under the heading Item 1A. Risk Factors in the Company’s 2019 Form 10-K. There has been no material changes to the Company’s risk factors as presented in the Company’s 2019 Form 10-K, other than the risk factors set forth below:

The effects of the COVID-19 pandemic have had and may continue to impact the Company’s businesses, results of operations and financial condition, and the extent and duration of these impacts remain uncertain. A second wave of COVID-19 may have a similar or worse impact on the Company than the first wave. The COVID-19 pandemic and governmental responses to the pandemic have had and will likely continue to have a severe impact on global economic conditions, including disruption and volatility in the financial markets, disruption of global supply chains, temporary closures or failures of businesses, increased unemployment, and the institution of social distancing and restrictions on movement in the U.S. and other countries.

East West Bank is considered an essential business in the eight states where we have branches or office locations. As part of the CARES Act passed by Congress in March 2020, various initiatives to protect and support individuals, businesses and local economies, such as the SBA PPP and the Main Street Lending Program were established. The Company participates and will continue to participate in the SBA PPP during the time it is available, or until August 8, 2020. Further, the Company participates in the Main Street Lending Program. In addition, to provide further relief to customers during these turbulent times, we are providing loan modifications and payment deferrals for customers impacted by COVID-19, and deferring foreclosures on certain residential mortgage loans. Our loan portfolio includes loans that are in forbearance but which are not classified as TDRs due to the exclusions provided in the CARES Act and federal banking regulators. In the future, we may be required to classify a portion of these loans as TDRs. There can be no assurance that the federal stimulus measures will improve the markets or economies in which we conduct operations. If the federal stimulus measures are not effective in mitigating the effect of COVID-19, credit issues for our loan customers may be severe and adversely affecting our business and results of operations more substantially over a longer period of time.

Further, in order to facilitate our business and in response to enhanced safety measures, the Company has implemented employee business travel restrictions, and has implemented business continuity plans, which include shifting a majority of our corporate and division office functions to work remotely, alternating workplace arrangements such as split work sites and rotating shifts for certain employees to suit the changing business requirements. To date, the business continuity plans work as designed and support our ongoing normal course of business. However, our ability to provide services has been, and may continue to be, to some extent, negatively impacted by interruptions due to illnesses, quarantines, “stay-at-home” orders or other restrictions of our employees, or the safety measures implemented to prevent illnesses of our employees, including the potential closure of particular branches and certain employees working remotely.

We may face increased cybersecurity risks due to the shifting of a majority of our corporate and division office functions to operating remotely in regions impacted by “stay-at-home” orders. Increased levels of remote access may create additional opportunities for cybercriminals to attempt to exploit vulnerabilities, and our employees may be more susceptible to phishing and social engineering attempts due to increased stress caused by the crisis and from balancing family and work responsibilities at home. In addition, our technological resources may be strained due to the number of remote users.

120

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The conditions caused by the COVID-19 pandemic could continue to adversely affect the ability of the Company’s borrowers to satisfy their obligations. Taken into consideration that many of the Company’s loans are secured by real estate, a potential decline in real estate markets could further impact the Company’s business and financial condition and the credit quality of the Company’s loan portfolio. If unemployment continues to rise and our clients and customers draw on their lines of credit or seek additional loans to help finance their businesses, our level of charge-offs and provision for credit losses could continue to increase. Further, the disruptions related to COVID-19 may decrease our borrowers’ confidence with respect to purchasing real estate or homes and adversely affect the demand for the Company’s loans and other products and services, the valuation of our loans, securities and derivatives portfolios, the carrying value of our deferred tax assets, our capital levels and liquidity, and our results of operations.

In addition, the unprecedented developments and reports relating to COVID-19 have coincided with heightened volatility in financial markets in the U.S. and worldwide. The continuation of prolonged adverse economic conditions (including whether due to a resurgence or a second wave of COVID-19 infections) primarily in the U.S. and Greater China can be expected to have adverse effects on the Company’s businesses and results of operations, which could have material impacts on the value of securities, derivatives and other financial instruments which the Company owns. The Company executes transactions with various counterparties in the financial industry, including broker-dealers, commercial banks and investment banks. Defaults by financial services institutions and uncertainty in the financial services industry in general could lead to market-wide liquidity problems and may expose the Company to credit risk in the event of default of its counterparties or clients and further increase the possibility of downgrades in the Company’s credit ratings. This pandemic, and any further measures undertaken by governmental authorities to address it, could significantly disrupt or prevent us from operating our business in the ordinary course for an extended period, and thereby, and/or along with any associated economic and/or social instability or distress, have a significant adverse effect on our results of operations and financial condition. Additionally, the earnings impacts from recent and future emergency interest rate cuts could further compress interest margins, which could potentially have an adverse effect on our results of operations and financial condition.

The extent to which the COVID-19 pandemic and any resultant economic downturn continues to impact our business, operations, and financial results is uncertain and will depend on numerous evolving factors that are outside our control and we may not be able to accurately predict, including the scope, severity and duration of the pandemic and the governmental, business and individual actions already taken, and those actions implemented in the future, in response to the pandemic and the impact of those actions on global economic activity, as well as the pace of economic recovery when the COVID-19 pandemic subsides. To the extent the COVID-19 pandemic continues to adversely affect our business, operations, and financial results, as well as global economic conditions more generally, it may also heighten many of the other risk factors described in the Company’s 2019 Form 10-K.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

There were no unregistered sales of equity securities for the second quarter and first half of 2020. The following table summarizes common stock repurchased by the Company under the Company’s common stock repurchase program for the first half of 2020. There were no repurchased activities for the second quarter of 2020.

Period						Total Number of Shares Repurchased (1)						Average Price Paid per Share of Common Stock						Total Number of Shares of Common Stock Purchased as Part of Publicly Announced Plans or Programs						Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs ($ in millions) (2)
January 1, 2020 - January 31, 2020						—						$	—					—						$	500.0
February 1, 2020 - February 29, 2020						—						—						—						500.0
March 1, 2020 - March 31, 2020						4,471,682						32.64						4,471,682						354.0
April 1, 2020 - April 30, 2020						—						—						—						354.0
May 1, 2020 - May 31, 2020						—						—						—						354.0
June 1, 2020 - June 30, 2020						—						—						—						354.0
Total						4,471,682						$	32.64					4,471,682						$	354.0

(1)Excludes activity of common stock pursuant to various stock compensation plans and agreements totaling $7.6 million.

(2)On March 3, 2020, the Company’s Board of Directors authorized the repurchase of up to $500.0 million of the Company’s common stock. This $500.0 million repurchase authorization is inclusive of the Company’s $100.0 million stock repurchase authorization previously outstanding. The share repurchase authorization has no expiration date.

121

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ITEM 6. EXHIBITS

 

        The following exhibit index lists Exhibits filed, or in the case of Exhibits 32.1 and 32.2 furnished, with this report:

Exhibit No.						Exhibit Description
31.1						Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. Filed herewith.
31.2						Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. Filed herewith.
32.1						Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. Furnished herewith.
32.2						Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. Furnished herewith.
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101.SCH						Inline XBRL Taxonomy Extension Schema Document. Filed herewith.
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122

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GLOSSARY OF ACRONYMS

AFS			Available-for-sale			LIBOR			London Interbank Offered Rates
ALCO			Asset/Liability Committee			LTV			Loan-to-value
AOCI			Accumulated other comprehensive income (loss)			MD&A			Management’s Discussion and Analysis of Financial Condition and Results of Operations
ARRC			Alternative Reference Rates Committee			MMBTU			Million British thermal unit
ASC			Accounting Standards Codification			Moody's			Moody’s Investors Service
ASU			Accounting Standards Update			NAV			Net asset value
C&I			Commercial and industrial			OREO			Other real estate owned
CARES Act			Coronavirus Aid, Relief, and Economic Security Act			OTTI			Other-than-temporary impairment
CECL			Current expected credit loss			PCD			Purchased credit deteriorated
CET1			Common Equity Tier 1			PCI			Purchased credit impaired
CLO			Collateralized loan obligation			PD			Probability of default
CME			Chicago Mercantile Exchange			PPP			Paycheck Protection Program
COVID-19			Coronavirus Disease 2019			PPPLF			Paycheck Protection Program Liquidity Facility
CRA			Community Reinvestment Act			RMB			Chinese Renminbi
CRE			Commercial real estate			ROA			Return on average assets
E&P			Exploration and production			ROE			Return on average equity
EPS			Earnings per share			RPA			Credit risk participation agreement
ERM			Enterprise risk management			RSU			Restricted stock unit
EVE			Economic value of equity			S&P			Standard and Poor's
FASB			Financial Accounting Standards Board			SBA			Small Business Administration
FHLB			Federal Home Loan Bank			SBLC			Standby letter of credit
Fitch			Fitch Ratings			SEC			U.S. Securities and Exchange Commission
FRB			Federal Reserve Bank			SOFR			Secured Overnight Financing Rate
FTP			Funds transfer pricing			TDR			Troubled debt restructuring
GAAP			Generally accepted accounting principles			U.S.			United States
HELOC			Home equity line of credit			USD			U.S. dollar
LCH			London Clearing House			VIE			Variable interest entity
LGD			Loss given default

123

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Dated:

August 7, 2020

EAST WEST BANCORP, INC. (Registrant)

By

/s/ IRENE H. OH

Irene H. Oh

Executive Vice President and Chief Financial Officer

124

Exhibit 31.1

 

CERTIFICATION

 

CERTIFICATION PURSUANT TO SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

FOR THE CHIEF EXECUTIVE OFFICER

 

I, Dominic Ng, certify that:

 

1.I have reviewed this Quarterly Report on Form 10-Q of East West Bancorp, Inc. (the “registrant”);

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

 

Date: August 7, 2020

 

			/s/ DOMINIC NG
			Dominic Ng
			Chief Executive Officer

 

Exhibit 31.2

 

CERTIFICATION

CERTIFICATION PURSUANT TO SECTION 302

OF THE SARBANES-OXLEY ACT OF 2002

FOR THE CHIEF FINANCIAL OFFICER

 

I, Irene H. Oh, certify that:

 

1.I have reviewed this Quarterly Report on Form 10-Q of East West Bancorp, Inc. (the “registrant”);

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

 

Date: August 7, 2020

  

			/s/ IRENE H. OH
			Irene H. Oh
			Chief Financial Officer

 

Exhibit 32.1

 

CERTIFICATION

 

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of East West Bancorp, Inc. (the “Company”) on Form 10-Q for the period ended June 30, 2020, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dominic Ng, Chairman and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, based on my knowledge that:

 

a.the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

b.the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

 

Date: August 7, 2020

 

			/s/ DOMINIC NG
			Dominic Ng
			Chief Executive Officer

Exhibit 32.2

 

CERTIFICATION

 

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

 

In connection with the Quarterly Report of East West Bancorp, Inc. (the “Company”) on Form 10-Q for the period ended June 30, 2020, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Irene H. Oh, Executive Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, based on my knowledge that:

 

a.the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

b.the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

 

Date: August 7, 2020

 

			/s/ IRENE H. OH
			Irene H. Oh
			Chief Financial Officer

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- Definition The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12 -Subsection b-2 + Details Name: dei_EntityRegistrantName Namespace Prefix: dei_ Data Type: xbrli:normalizedStringItemType Balance Type: na Period Type: duration

X

- Definition Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12 -Subsection b-2 + Details Name: dei_EntityShellCompany Namespace Prefix: dei_ Data Type: xbrli:booleanItemType Balance Type: na Period Type: duration

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- Definition Indicates that the company is a Smaller Reporting Company (SRC). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12 -Subsection b-2 + Details Name: dei_EntitySmallBusiness Namespace Prefix: dei_ Data Type: xbrli:booleanItemType Balance Type: na Period Type: duration

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- Definition The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12 -Subsection b-2 + Details Name: dei_EntityTaxIdentificationNumber Namespace Prefix: dei_ Data Type: dei:employerIdItemType Balance Type: na Period Type: duration

X

- Definition Local phone number for entity. + References No definition available. + Details Name: dei_LocalPhoneNumber Namespace Prefix: dei_ Data Type: xbrli:normalizedStringItemType Balance Type: na Period Type: duration

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- Definition Title of a 12(b) registered security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Exchange Act -Number 240 -Section 12 -Subsection b + Details Name: dei_Security12bTitle Namespace Prefix: dei_ Data Type: dei:securityTitleItemType Balance Type: na Period Type: duration

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- Definition Name of the Exchange on which a security is registered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Exchange Act -Number 240 -Section 12 -Subsection d1-1 + Details Name: dei_SecurityExchangeName Namespace Prefix: dei_ Data Type: dei:edgarExchangeCodeItemType Balance Type: na Period Type: duration

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- Definition Trading symbol of an instrument as listed on an exchange. + References No definition available. + Details Name: dei_TradingSymbol Namespace Prefix: dei_ Data Type: dei:tradingSymbolItemType Balance Type: na Period Type: duration

v3.20.2

Consolidated Balance Sheet - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	$ 602,974	$ 536,221
Interest-bearing cash with banks	3,930,528	2,724,928
Cash and cash equivalents	4,533,502	3,261,149
Interest-bearing deposits with banks	531,591	196,161
Securities purchased under resale agreements (“resale agreements”)	1,260,000	860,000
Securities:
Available-for-sale (''AFS'') debt securities, at fair value (amortized cost of $3,823,714 in 2020; includes assets pledged as collateral of $745,163 in 2020 and $479,432 in 2019)	3,884,574	3,317,214
Restricted equity securities, at cost	78,963	78,580
Loans held-for-sale	3,875	434
Loans held-for-investment (net of allowance for loan losses of $632,071 in 2020 and $358,287 in 2019; includes assets pledged as collateral of $27,408,027 in 2020 and $22,431,092 in 2019)	36,597,341	34,420,252
Investments in qualified affordable housing partnerships, net	201,888	207,037
Investments in tax credit and other investments, net	251,318	254,140
Premises and equipment (net of accumulated depreciation of $122,372 in 2020 and $116,790 in 2019)	110,709	118,364
Goodwill	465,697	465,697
Operating lease right-of-use assets	94,898	99,973
Other assets	1,393,237	917,095
TOTAL	49,407,593	44,196,096
LIABILITIES
Noninterest-bearing	13,940,420	11,080,036
Interest-bearing	26,732,258	26,244,223
Total deposits	40,672,678	37,324,259
Short-term borrowings	252,851	28,669
Federal Home Loan Bank (“FHLB”) advances	656,759	745,915
Securities sold under repurchase agreements (“repurchase agreements”)	300,000	200,000
Long-term debt and finance lease liabilities	1,580,442	152,270
Operating lease liabilities	102,708	108,083
Accrued expenses and other liabilities	854,912	619,283
Total liabilities	44,420,350	39,178,479
COMMITMENTS AND CONTINGENCIES (Note 10)
STOCKHOLDERS’ EQUITY
Common stock, $0.001 par value, 200,000,000 shares authorized; 167,143,278 and 166,621,959 shares issued in 2020 and 2019, respectively	167	167
Additional paid-in capital	1,841,748	1,826,345
Retained earnings	3,755,649	3,689,377
Treasury stock, at cost — 25,656,881 shares in 2020 and 20,996,574 shares in 2019	(633,455)	(479,864)
Accumulated other comprehensive income (loss) (“AOCI”), net of tax	23,134	(18,408)
Total stockholders’ equity	4,987,243	5,017,617
TOTAL	$ 49,407,593	$ 44,196,096

X

- Definition Interest-bearing deposits with banks include cash placed with other banks with original maturities greater than three months and less than one year. + References No definition available. + Details Name: ewbc_InterestBearingDepositsWithBanks Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Represents the net amount of investments in the projects, excluding affordable housing projects, that qualify for Community Reinvestment Act (CRA) credits or other types of tax credits. + References No definition available. + Details Name: ewbc_InvestmentsinTaxCreditandOtherInvestmentsNet Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Securities [Abstract] + References No definition available. + Details Name: ewbc_SecuritiesAbstract Namespace Prefix: ewbc_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Amount of expenses incurred but not yet paid nor invoiced, and liabilities classified as other. + References No definition available. + Details Name: us-gaap_AccruedLiabilitiesAndOtherLiabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details Name: us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details Name: us-gaap_AdditionalPaidInCapital Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details Name: us-gaap_AdvancesFromFederalHomeLoanBanks Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Amount of investment in qualified affordable housing projects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details Name: us-gaap_AmortizationMethodQualifiedAffordableHousingProjectInvestments Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=121559654&loc=d3e5710-111685 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116870748&loc=SL6758485-165988 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 + Details Name: us-gaap_Assets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- References No definition available. + Details Name: us-gaap_AssetsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details Name: us-gaap_AvailableForSaleSecuritiesDebtSecurities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details Name: us-gaap_CashAndCashEquivalentsAtCarryingValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details Name: us-gaap_CashAndDueFromBanks Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),19) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.17) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details Name: us-gaap_CommitmentsAndContingencies Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details Name: us-gaap_CommonStockValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details Name: us-gaap_Deposits Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock. + References No definition available. + Details Name: us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details Name: us-gaap_Goodwill Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition The aggregate of all domestic and foreign interest-bearing deposit liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details Name: us-gaap_InterestBearingDepositLiabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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v3.20.2

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
ASSETS
Available for sale debt investment securities pledged as collateral, fair value	$ 745,163	$ 479,432
Available-for-sale (AFS), at amortized cost	3,823,714	3,320,648
Allowance for loan losses	632,071	358,287
Loans held-for-investment pledged as collateral	27,408,027	22,431,092
Premises and equipment, accumulated depreciation	$ 122,372	$ 116,790
STOCKHOLDERS’ EQUITY
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	167,143,278	166,621,959
Treasury stock, shares (in shares)	25,656,881	20,996,574

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details Name: us-gaap_CommonStockSharesIssued Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

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v3.20.2

Consolidated Statement of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
INTEREST AND DIVIDEND INCOME
Loans receivable, including fees	$ 367,393	$ 434,450	$ 779,262	$ 857,984
AFS debt securities	21,004	15,685	41,146	31,433
Resale agreements	5,514	7,404	11,139	15,310
Restricted equity securities	301	505	747	1,218
Interest-bearing cash and deposits with banks	4,564	16,800	15,672	32,210
Total interest and dividend income	398,776	474,844	847,966	938,155
INTEREST EXPENSE
Deposits	46,399	97,964	122,802	189,969
Short-term borrowings	265	361	821	977
FHLB advances	3,343	4,011	7,509	6,990
Repurchase agreements	3,540	3,469	7,531	6,961
Long-term debt and finance lease liabilities	1,454	1,713	2,821	3,471
Total interest expense	55,001	107,518	141,484	208,368
Net interest income before provision for credit losses	343,775	367,326	706,482	729,787
Provision for credit losses	102,443	19,245	176,313	41,824
Net interest income after provision for credit losses	241,332	348,081	530,169	687,963
NONINTEREST INCOME
Lending fees	21,946	16,423	37,719	31,392
Deposit account fees	10,872	9,607	21,319	19,075
Foreign exchange income	4,562	7,286	12,381	12,301
Wealth management fees	3,091	3,800	8,444	7,574
Interest rate contracts and other derivative income	6,107	10,398	13,180	13,614
Net gains on sales of loans	132	15	1,082	930
Gains on sales of AFS debt securities	9,640	1,447	11,169	3,008
Other investment income	966	706	2,887	1,908
Other income	1,321	3,077	4,505	5,088
Total noninterest income	58,637	52,759	112,686	94,890
NONINTEREST EXPENSE
Compensation and employee benefits	96,955	100,531	198,915	202,830
Occupancy and equipment expense	16,217	17,362	33,293	34,680
Deposit insurance premiums and regulatory assessments	3,700	2,919	7,127	6,007
Legal expense	1,530	2,355	4,727	4,580
Data processing	4,480	3,460	8,306	6,617
Consulting expense	1,413	2,069	2,630	4,128
Deposit related expense	3,353	3,338	6,916	6,842
Computer software expense	7,301	6,211	13,467	12,289
Other operating expense	19,248	22,679	40,367	44,968
Amortization of tax credit and other investments	24,759	16,739	42,084	41,644
Repurchase agreements’ extinguishment cost	8,740	0	8,740	0
Total noninterest expense	187,696	177,663	366,572	364,585
INCOME BEFORE INCOME TAXES	112,273	223,177	276,283	418,268
INCOME TAX EXPENSE	12,921	72,797	32,107	103,864
NET INCOME	$ 99,352	$ 150,380	$ 244,176	$ 314,404
EARNINGS PER SHARE (“EPS”)
BASIC (in dollars per share)	$ 0.70	$ 1.03	$ 1.71	$ 2.16
DILUTED (in dollars per share)	$ 0.70	$ 1.03	$ 1.70	$ 2.15
WEIGHTED-AVERAGE NUMBER OF SHARES OUTSTANDING
BASIC (in shares)	141,486	145,546	143,150	145,402
DILUTED (in shares)	141,827	146,052	143,560	146,016

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- Definition The amount of expenses incurred in the period for information technology and data processing products and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.6) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details Name: us-gaap_InformationTechnologyAndDataProcessing Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details Name: us-gaap_InterestAndDividendIncomeOperating Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details Name: us-gaap_InterestAndFeeIncomeLoansAndLeases Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (210.5-03(11)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details Name: us-gaap_InterestExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Aggregate amount of interest expense on all deposits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.6) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details Name: us-gaap_InterestExpenseDeposits Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Interest expense incurred during the reporting period on long-term borrowings associated with Federal Home Loan Bank and Federal Reserve Bank advances. + References No definition available. + Details Name: us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of interest expense incurred on long-term debt classified as other, including, but not limited to, interest on long-term notes and amortization of issuance costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.8) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details Name: us-gaap_InterestExpenseOtherLongTermDebt Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Interest expense incurred during the reporting period on other short-term borrowings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.7) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details Name: us-gaap_InterestExpenseOtherShortTermBorrowings Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Gross expenses on securities sold coupled with an agreement to repurchase the same from the same counterparty at a fixed or determinable price within a fixed or variable time period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.7) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details Name: us-gaap_InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.4) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details Name: us-gaap_InterestIncomeDepositsWithFinancialInstitutions Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Interest income derived from securities purchased under agreements to resell. The difference in the price at which the institution buys the securities and resells the securities represents interest for the use of the funds by the other party. Most repurchase and sale agreements involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances and negotiable certificates of deposits are sometimes used in such transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.4) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details Name: us-gaap_InterestIncomeSecuritiesPurchasedUnderAgreementsToResell Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(4)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details Name: us-gaap_LaborAndRelatedExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details Name: us-gaap_LegalFees Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Total aggregate amount of all noninterest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details Name: us-gaap_NoninterestExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- References No definition available. + Details Name: us-gaap_NoninterestExpenseAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details Name: us-gaap_NoninterestIncome Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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v3.20.2

Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 99,352	$ 150,380	$ 244,176	$ 314,404
Other comprehensive income (loss), net of tax:
Net changes in unrealized gains on AFS debt securities	17,816	29,027	45,269	51,038
Net changes in unrealized losses on cash flow hedge	(1,333)		(1,333)
Foreign currency translation adjustments	(230)	(6,016)	(2,394)	(2,836)
Other comprehensive income	16,253	23,011	41,542	48,202
COMPREHENSIVE INCOME	$ 115,605	$ 173,391	$ 285,718	$ 362,606

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v3.20.2

Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands		Total	Cumulative Effect, Period Of Adoption, Adjustment	Common Stock	Common Stock and Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period Of Adoption, Adjustment	Treasury Stock	AOCI, Net of Tax
Beginning balance at Dec. 31, 2018		$ 4,423,974			$ 1,789,977	$ 3,160,132		$ (467,961)	$ (58,174)
Beginning balance (Accounting Standards Update 2016-02) at Dec. 31, 2018	[1]		$ 14,668				$ 14,668
Beginning balance (in shares) at Dec. 31, 2018				144,961,363
Increase (Decrease) in Stockholders' Equity
Net income		314,404				314,404
Other comprehensive income (loss)		48,202							48,202
Warrants exercised		4,443			1,711			2,732
Warrants exercised (in shares)				180,226
Net activity of common stock pursuant to various stock compensation plans and agreements		3,205			17,374			(14,169)
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)				404,980
Cash dividends on common stock		(74,303)				(74,303)
Ending balance at Jun. 30, 2019		$ 4,734,593			1,809,062	3,414,901		(479,398)	(9,972)
Ending balance (in shares) at Jun. 30, 2019				145,546,569
Accounting Standards Update [Extensible List]	[2]	us-gaap:AccountingStandardsUpdate201613Member
Beginning balance at Dec. 31, 2018		$ 4,423,974			1,789,977	3,160,132		(467,961)	(58,174)
Beginning balance (Accounting Standards Update 2016-02) at Dec. 31, 2018	[1]		14,668				14,668
Beginning balance (in shares) at Dec. 31, 2018				144,961,363
Ending balance at Dec. 31, 2019		5,017,617			1,826,512	3,689,377		(479,864)	(18,408)
Ending balance (Accounting Standards Update 2016-13) at Dec. 31, 2019	[2]		$ (97,967)				$ (97,967)
Ending balance (in shares) at Dec. 31, 2019				145,625,385
Beginning balance at Mar. 31, 2019		4,591,930			1,799,124	3,305,054		(479,265)	(32,983)
Beginning balance (in shares) at Mar. 31, 2019				145,501,301
Increase (Decrease) in Stockholders' Equity
Net income		150,380				150,380
Other comprehensive income (loss)		23,011							23,011
Net activity of common stock pursuant to various stock compensation plans and agreements		9,805			9,938			(133)
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)				45,268
Cash dividends on common stock		(40,533)				(40,533)
Ending balance at Jun. 30, 2019		$ 4,734,593			1,809,062	3,414,901		(479,398)	(9,972)
Ending balance (in shares) at Jun. 30, 2019				145,546,569
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member
Beginning balance at Dec. 31, 2019		$ 5,017,617			1,826,512	3,689,377		(479,864)	(18,408)
Beginning balance (in shares) at Dec. 31, 2019				145,625,385
Increase (Decrease) in Stockholders' Equity
Net income		244,176				244,176
Other comprehensive income (loss)		41,542							41,542
Net activity of common stock pursuant to various stock compensation plans and agreements		7,778			15,403			(7,625)
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)				332,694
Repurchase of common stock pursuant to the Stock Repurchase Program		(145,966)						(145,966)
Repurchase of common stock pursuant to the Stock Repurchase Program (in shares)				(4,471,682)
Cash dividends on common stock		(79,937)				(79,937)
Ending balance at Jun. 30, 2020		4,987,243			1,841,915	3,755,649		(633,455)	23,134
Ending balance (in shares) at Jun. 30, 2020				141,486,397
Beginning balance at Mar. 31, 2020		4,902,985			1,833,784	3,695,759		(633,439)	6,881
Beginning balance (in shares) at Mar. 31, 2020				141,435,099
Increase (Decrease) in Stockholders' Equity
Net income		99,352				99,352
Other comprehensive income (loss)		16,253							16,253
Net activity of common stock pursuant to various stock compensation plans and agreements		8,115			8,131			(16)
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)				51,298
Cash dividends on common stock		(39,462)				(39,462)
Ending balance at Jun. 30, 2020		$ 4,987,243			$ 1,841,915	$ 3,755,649		$ (633,455)	$ 23,134
Ending balance (in shares) at Jun. 30, 2020				141,486,397
[1] Represents the impact of the adoption of Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842) and subsequent related ASUs in the first quarter of 2019. [2] Represents the impact of the adoption of ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) in the first quarter of 2020. Refer to Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Quarterly Report on Form 10-Q (“this Form 10-Q”) for additional information.

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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details Name: us-gaap_TreasuryStockSharesAcquired Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details Name: us-gaap_TreasuryStockValueAcquiredCostMethod Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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v3.20.2

Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share (in dollars per share)	$ 0.275	$ 0.275	$ 0.550	$ 0.505

X

- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details Name: us-gaap_CommonStockDividendsPerShareDeclared Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

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v3.20.2

Consolidated Statement of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 244,176	$ 314,404
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	68,926	72,113
Accretion of discount and amortization of premiums, net	(18,901)	(9,817)
Stock compensation costs	14,280	15,525
Deferred income tax benefit	(111)	(2,110)
Provision for credit losses	176,313	41,824
Net gains on sales of loans	(1,082)	(930)
Gains on sales of AFS debt securities	(11,169)	(3,008)
Repurchase agreements’ extinguishment costs	8,740	0
Loans held-for-sale:
Originations and purchases	(21,791)	(3,339)
Proceeds from sales and paydowns/payoffs of loans originally classified as held-for-sale	18,386	3,632
Proceeds from distributions received from equity method investees	1,107	1,538
Net change in accrued interest receivable and other assets	(456,374)	(150,154)
Net change in accrued expenses and other liabilities	257,397	10,320
Other net operating activities	(241)	3
Total adjustments	26,740	(24,403)
Net cash provided by operating activities	270,916	290,001
CASH FLOWS FROM INVESTING ACTIVITIES
Investments in qualified affordable housing partnerships, tax credit and other investments	(68,884)	(61,555)
Interest-bearing deposits with banks	(315,497)	222,387
Resale agreements:
Proceeds from paydowns and maturities	350,000	50,000
Purchases	(500,000)	(25,000)
AFS debt securities:
Proceeds from sales	484,380	375,102
Proceeds from repayments, maturities and redemptions	848,633	117,325
Purchases	(1,834,087)	(316,740)
Loans held-for-investment:
Proceeds from sales of loans originally classified as held-for-investment	144,015	170,174
Purchases	(145,695)	(326,456)
Other changes in loans held-for-investment, net	(2,475,089)	(1,196,094)
Premises and equipment:
Proceeds from sales	1,883	0
Purchases	(1,846)	(4,414)
Proceeds from distributions received from equity method investees	1,948	3,636
Other net investing activities	(374)	(5,516)
Net cash used in investing activities	(3,510,613)	(997,151)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	3,355,168	1,035,650
Net increase (decrease) in short-term borrowings	225,834	(38,107)
FHLB advances:
Proceeds	10,100	1,500,000
Repayment	(100,099)	(1,082,000)
Repayment of repurchase agreements	(150,000)	0
Repurchase agreements’ extinguishment cost	(8,740)	0
Proceeds from long-term debt	1,437,269	0
Repayment of long-term debt and lease liabilities	(9,320)	(435)
Common stock:
Repurchase of common stocks pursuant to the Stock Repurchase Program	(145,965)	0
Proceeds from issuance pursuant to various stock compensation plans and agreements	1,170	1,894
Stocks tendered for payment of withholding taxes	(7,626)	(14,169)
Cash dividends paid	(80,271)	(74,949)
Net cash provided by financing activities	4,527,520	1,327,884
Effect of exchange rate changes on cash and cash equivalents	(15,470)	(497)
NET INCREASE IN CASH AND CASH EQUIVALENTS	1,272,353	620,237
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	3,261,149	3,001,377
CASH AND CASH EQUIVALENTS, END OF PERIOD	4,533,502	3,621,614
Cash paid during the period for:
Interest	145,723	203,577
Income taxes, net	5,609	76,153
Noncash investing and financing activities:
Loans transferred from held-for-investment to held-for-sale	143,283	173,394
Loans transferred to OREO	$ 19,504	$ 0

X

- Definition Accretion of discount and amortization of premiums related to investment securities, loans receivables, and borrowings. + References No definition available. + Details Name: ewbc_AccretionAmortizationofDiscountandPremiumsNet Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Available for Sale Investment Securities [Abstract] + References No definition available. + Details Name: ewbc_AvailableforSaleInvestmentSecuritiesAbstract Namespace Prefix: ewbc_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- References No definition available. + Details Name: ewbc_CashPaidDuringPeriodForAbstract Namespace Prefix: ewbc_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Common Stock [Abstract] + References No definition available. + Details Name: ewbc_CommonStockAbstract Namespace Prefix: ewbc_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Loans Held for Sale, Financing [Abstract] + References No definition available. + Details Name: ewbc_LoansHeldforSaleFinancingAbstract Namespace Prefix: ewbc_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition The net cash outflow or inflow for the increase (decrease) in investments in qualified affordable housing partnerships and other investments that qualify for Community Reinvestment Act (CRA) credits or other types of tax credits. + References No definition available. + Details Name: ewbc_PaymentsforProceedsfromQualifiedAffordableHousingPartnershipsandOtherTaxCreditInvestments Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- References No definition available. + Details Name: ewbc_ProceedsFromSaleOfAbstract Namespace Prefix: ewbc_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition The sum of adjustments which are added to or deducted from net income or loss, including the portion attributable to noncontrolling interest, to reflect cash provided by or used in operating activities, in accordance with the indirect cash flow method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details Name: us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121583591&loc=SL98516268-108586 + Details Name: us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3521-108585 + Details Name: us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), excluding other-than-temporary impairment (OTTI). + References No definition available. + Details Name: us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details Name: us-gaap_GainLossOnSalesOfLoansNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586 + Details Name: us-gaap_IncomeTaxesPaidNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 + Details Name: us-gaap_InterestPaidNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3521-108585 + Details Name: us-gaap_NetCashProvidedByUsedInFinancingActivities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3521-108585 + Details Name: us-gaap_NetCashProvidedByUsedInInvestingActivities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details Name: us-gaap_NetCashProvidedByUsedInOperatingActivities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669619-108580 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section 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-Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI 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- Definition Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities). + References No definition available. + Details Name: us-gaap_OtherOperatingActivitiesCashFlowStatement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The aggregate amount of cash outflow for loans purchased and created with the intention to resell them in the near future. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3461-108585 + Details Name: us-gaap_PaymentsForOriginationAndPurchasesOfLoansHeldForSale Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 + Details Name: us-gaap_PaymentsForProceedsFromLoansAndLeases Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of cash (inflow) outflow from investing activities classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details Name: us-gaap_PaymentsForProceedsFromOtherInvestingActivities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details Name: us-gaap_PaymentsForRepurchaseOfCommonStock Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The cash outflow associated with agreements to purchase and then resell securities to counterparties (reverse repurchase agreements). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details Name: us-gaap_PaymentsForSecuritiesPurchasedUnderAgreementsToResell Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details Name: us-gaap_PaymentsOfDebtExtinguishmentCosts Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Cash outflow in the form of ordinary dividends to common shareholders, preferred shareholders and noncontrolling interests, generally out of earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details Name: us-gaap_PaymentsOfOrdinaryDividends Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details Name: us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 + Details Name: us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The cash outflow for the purchase of amounts due from customers, clients, lessees, borrowers, or others under the terms of its agreements therewith. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details Name: us-gaap_PaymentsToAcquireFinanceReceivables Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details Name: us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI http://asc.fasb.org/extlink&oid=121586364&loc=SL94080555-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details Name: us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of cash inflow from Federal Home Loan Bank (FHLBank) borrowing, classified as financing activity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details Name: us-gaap_ProceedsFromFederalHomeLoanBankBorrowings Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_ProceedsFromIssuanceOfLongTermDebtAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Amount of cash inflow from issuance of long-term debt classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details Name: us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details Name: us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3151-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details Name: us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The net cash inflow or outflow in Interest-bearing Deposits by banks in other financial institutions for relatively short periods of time including, for example, certificates of deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3098-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121551529&loc=d3e60009-112784 + Details Name: us-gaap_ProceedsFromPaymentsForInInterestBearingDepositsInBanks Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 + Details Name: us-gaap_ProceedsFromRepaymentsOfShortTermDebt Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition The cash inflow from sale proceeds and collection of repayments from borrowers on loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization; includes mortgages and other types of loans. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3461-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3337-108585 + Details Name: us-gaap_ProceedsFromSaleAndCollectionOfLoansHeldforsale Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details Name: us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition The cash inflow associated with the sale of receivables arising from the financing of goods and services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details Name: us-gaap_ProceedsFromSaleOfFinanceReceivables Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details Name: us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition The cash inflow associated with agreements to purchase and then resell securities to counterparties (reverse repurchase agreements). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details Name: us-gaap_ProceedsFromSecuritiesPurchasedUnderAgreementsToResell Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details Name: us-gaap_ProvisionForLoanLeaseAndOtherLosses Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of cash outflow for repayment of Federal Home Loan Bank (FHLBank) borrowing, classified as financing activity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details Name: us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount of cash outflow for the payment of debt classified as other, maturing after one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details Name: us-gaap_RepaymentsOfOtherLongTermDebt Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details Name: us-gaap_ShareBasedCompensation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Value transferred from mortgage loans to real estate owned (REO) in noncash transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details Name: us-gaap_TransferToOtherRealEstate Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

v3.20.2

Basis of Presentation	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation East West Bancorp, Inc. (referred to herein on an unconsolidated basis as “East West” and on a consolidated basis as the “Company”) is a registered bank holding company that offers a full range of banking services to individuals and businesses through its subsidiary bank, East West Bank and its subsidiaries (“East West Bank” or the “Bank”). The unaudited interim Consolidated Financial Statements in this Form 10-Q include the accounts of East West, East West Bank and East West’s subsidiaries. Intercompany transactions and accounts have been eliminated in consolidation. As of June 30, 2020, East West also has six wholly-owned subsidiaries that are statutory business trusts (the “Trusts”). In accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 810, Consolidation, the Trusts are not included on the Consolidated Financial Statements. East West also owns East West Insurance Services, Inc. In 2019, the Company acquired East West Markets, LLC, a private broker dealer and also established East West Investment Management LLC, a registered investment adviser. Both East West Markets, LLC and East West Investment Management LLC are wholly-owned subsidiaries of East West. The unaudited interim Consolidated Financial Statements are presented in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”), applicable guidelines prescribed by regulatory authorities, and general practices in the banking industry. They reflect all adjustments that, in the opinion of management, are necessary for fair statement of the interim Consolidated Financial Statements. Certain items on the Consolidated Financial Statements and notes for the prior periods have been reclassified to conform to the current period presentation. The current period’s results of operations are not necessarily indicative of results that may be expected for any other interim period or for the year as a whole. Events subsequent to the Consolidated Balance Sheet date have been evaluated through the date the Consolidated Financial Statements are issued for inclusion in the accompanying Consolidated Financial Statements. The unaudited interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and notes thereto, included in the Company’s annual report on Form 10-K for the year ended December 31, 2019, filed with the U.S. Securities and Exchange Commission on February 27, 2020 (the “Company’s 2019 Form 10-K”).

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- Definition The entire disclosure for the business description and basis of presentation concepts. Business description describes the nature and type of organization including but not limited to organizational structure as may be applicable to holding companies, parent and subsidiary relationships, business divisions, business units, business segments, affiliates and information about significant ownership of the reporting entity. Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -URI http://asc.fasb.org/topic&trid=2122149 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details Name: us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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v3.20.2

Current Accounting Developments and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Current Accounting Developments and Summary of Significant Accounting Policies	Current Accounting Developments and Summary of Significant Accounting Policies New Accounting Pronouncements Adopted Standard Required Date of Adoption Description Effect on Financial Statements Standards Adopted in 2020 ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments and subsequent related ASUs January 1, 2020 Early adoption is permitted on January 1, 2019. The ASU introduces a new current expected credit loss (“CECL”) model that applies to most financial assets measured at amortized cost and certain instruments, including trade and other receivables, loan receivables, AFS and held-to-maturity debt securities, net investments in leases and off-balance sheet credit exposures. The CECL model utilizes a lifetime “expected credit loss” measurement objective for the recognition of credit losses at the time the financial asset is originated or acquired. The expected credit losses are adjusted in each period for changes in expected lifetime credit losses. ASU 2016-13 also eliminates the guidance for purchased credit impaired (“PCI”) loans, but requires an allowance for loan losses for purchased financial assets with more than an insignificant deterioration of credit since origination. The ASU also modifies the other-than-temporary impairment (“OTTI”) model for AFS debt securities to require an allowance for credit losses instead of a direct write-down. A reversal of the allowance for credit losses is allowed in future periods based on improvements in credit performance expectations. This ASU expands the disclosure requirements regarding an entity’s assumptions, models and methods for estimating the allowance for loan and lease losses, and requires disclosure of the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination (i.e., by vintage year). The guidance should be applied using a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption. The new guidance also allows optional relief for certain instruments measured at amortized cost with an option to irrevocably elect the fair value option under ASC Topic 825, Financial Instruments. The Company adopted ASU 2016-13 using a modified retrospective approach on January 1, 2020 without electing the fair value option on eligible financial instruments under ASU 2019-05. The adoption of this ASU increased the allowance for loan losses by $125.2 million, and allowance for unfunded credit commitments by $10.5 million and an after-tax decrease to opening retained earnings of $98.0 million on January 1, 2020. The increase to allowance for loan losses was primarily related to the commercial and industrial (“C&I”) and commercial real estate (“CRE”) loan portfolios. The Company did not record an allowance for credit losses related to the Company’s AFS debt securities as a result of this adoption. Disclosures for periods after January 1, 2020 are presented in accordance with ASC 326 while prior period amounts continue to be reported in accordance with previously applicable standards and the accounting policies described in the Company’s 2019 Form 10-K. The Company has elected the CECL phase-in option provided by regulatory capital rules, which delays the impact of CECL on regulatory capital for two years, followed by a three-year transition period. ASU 2017-04, Intangibles — Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment January 1, 2020 Early adoption is permitted for interim or annual goodwill impairment tests with measurement dates after January 1, 2017. The ASU simplifies the accounting for goodwill impairment. Under this guidance, an entity will no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, an impairment loss will be recognized when the carrying amount of a reporting unit exceeds its fair value and the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The guidance also eliminates the requirement to perform a qualitative assessment for any reporting units with a zero or negative carrying amount. This guidance should be applied prospectively. The Company adopted this guidance on January 1, 2020. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements. ASU 2018-15, Intangibles — Goodwill and Other — Internal-Use Software (Subtopic 350-40) Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract January 1, 2020 The ASU amends ASC Topic 350-40 to align the accounting for costs incurred in a cloud computing arrangement with the guidance on developing internal use software. Specifically, if a cloud computing arrangement is deemed to be a service contract, certain implementation costs are eligible for capitalization. The new guidance prescribes the balance sheet and income statement presentation and cash flow classification for the capitalized costs and related amortization expense. The amendments in this ASU should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company adopted this guidance on a prospective basis on January 1, 2020. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements. Recent Accounting Pronouncement Standard Required Date of Adoption Description Effect on Financial Statements Standard Not Yet Adopted ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting Effective for all entities as of March 12, 2020 through December 31, 2022. In March 2020, the FASB issued a new accounting standard related to contracts or hedging relationships that reference London interbank offered rate or other reference rates that are expected to be discontinued due to reference rate reform. This ASU provides temporary optional expedients and exceptions regarding the accounting requirements related to the modification of certain contracts, hedging relationships and other transactions that are affected by the reference rate reform. The guidance permits the Company to make a one-time election to sell and/or transfer qualifying held-to-maturity securities, and not to apply modification accounting or remeasure lease payments in lease contracts if the changes to the contract are related to the discontinuation of the reference rate. If certain criteria are met, the amendments also allow exceptions to the de-designation criteria of the hedging relationship and the assessment of hedge effectiveness during the transition period. This one time election may be made at any time after March 12, 2020, but no later than December 31, 2022. The Company has not yet made a determination on whether it will make this election and is currently tracking the exposure as of each reporting period and assessing the significance of impact towards implementing any necessary modification in consideration of the election of this amendment. The Company will continue to assess the impact as the reference rate transition occurs over the next two years. Summary of Significant Accounting Policies The Company has revised the following significant accounting policies. Allowance for Loan Losses — The allowance for loan losses is established as management’s estimate of expected credit losses inherent in the Company’s lending activities and increased by the provision for credit losses and decreased by net charge-offs. Subsequent recoveries, if any, are credited to the allowance for loan losses. The allowance for loan losses is evaluated quarterly by management based on regular reviews of the collectability of the loans. The Company develops and documents the allowance for loan losses methodology at the portfolio segment level — the commercial loan portfolio is comprised of C&I, CRE, multifamily residential, and construction and land loans; and the consumer loan portfolio is comprised of single-family residential, home equity lines of credit (“HELOC”), and other consumer loans. The allowance for loan losses represents the portion of the loan’s amortized cost basis that the Company does not expect to collect due to anticipated credit losses over the loan’s contractual life. The Company measures the expected loan losses on a collective pool basis when similar risk characteristics exist. Models consisting of quantitative and qualitative components are designed for each pool to develop the expected credit loss estimates. Reasonable and supportable forecast periods vary by loan portfolio. The collectively evaluated loans include non-classified and classified loans that have not been determined to be impaired. The Company has adopted lifetime loss rate models for the portfolios, which use historical loss rates and forecast economic variables to calculate the expected credit losses for each loan pool. When impaired loans do not share similar risk characteristics, the Company evaluates the loan for expected credit losses on an individual basis. Impaired loans include nonaccrual and troubled debt restructuring (“TDR”) loans. The Company considers loans to be impaired if, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the original contractual terms of the loan agreement. For loans determined to be impaired, three different asset valuation measurement methods are available: (1) the present value of expected future cash flows, (2) the fair value of collateral less costs to sell, and (3) the loan's observable market price. The allowance for loan losses for collateral-dependent loans is determined based on the fair value of the collateral less costs to sell. For loans that are not collateral-dependent, the Company applies the present value of expected future cash flows valuation or the market value of the loan. When the loan is deemed uncollectible, the Company’s policy is to promptly charge off the estimated impaired amount. The amortized cost of loans held-for-investment excludes accrued interest, which is included in Other assets on the Consolidated Balance Sheet. The Company has made an accounting policy election to not recognize an allowance for credit losses for accrued interest receivables as the Company reverses accrued interest if a loan is on nonaccrual status. The allowance for loan losses is reported separately on the Consolidated Balance Sheet and the Provision for credit losses is reported on the Consolidated Statement of Income. Allowance for Unfunded Credit Commitments — The allowance for unfunded credit commitments includes reserves provided for unfunded loan commitments, letters of credit, standby letters of credit (“SBLCs”) and recourse obligations for loans sold. The Company estimates the allowance for unfunded credit commitments over the contractual period in which the entity is exposed to credit risk via a present contractual obligation to extend credit. Within the period of credit exposure, the estimate of credit losses will consider both the likelihood that funding will occur, and an estimate of the expected credit losses on the commitments that are expected to fund over their estimated lives. The allowance for unfunded credit commitments is maintained at a level believed by management to be sufficient to absorb estimated expected credit losses related to unfunded credit facilities. The determination of the adequacy of the allowance is based on periodic evaluations of the unfunded credit facilities. For all off-balance sheet instruments and commitments, the unfunded credit exposure is calculated using utilization assumptions based on the Company's historical utilization experience in related portfolio segments. Loss rates are applied to the calculated exposure balances to estimate the allowance for unfunded credit commitments. Other elements such as credit risk factors for loans outstanding, terms and expiration dates of the unfunded credit facilities, and other pertinent information are considered to determine the adequacy of the allowance. The allowance for unfunded credit commitments is included in Accrued expenses and other liabilities on the Consolidated Balance Sheet. Changes to the allowance for unfunded credit commitments are included in Provision for credit losses on the Consolidated Income Statements. Allowance for Credit Losses on Available-for-Sale Debt Securities — ASU 2016-13 modifies the OTTI model for AFS debt securities to apply an allowance approach for credit impairment as opposed to permanently writing down the cost basis of the security. For each reporting period, AFS debt securities that are in an unrealized loss position are individually analyzed as part of the Company’s ongoing assessments to determine whether a fair value below the amortized cost basis has resulted from a credit loss or other factors. The initial indicator of impairment is a decline in fair value below the amortized cost, excluding accrued interest, of the AFS debt security. The Company first considers whether there is a plan to sell the AFS debt security or it is more-likely-than-not that it will be required to sell the debt security before recovery of the amortized cost. In determining whether an impairment is due to credit related factors, the Company considers the severity of the decline in fair value, nature of the security, the underlying collateral, the financial condition of the issuer, changes in the AFS debt securities’ ratings and other qualitative factors. For securities that are fully guaranteed by the U.S. government, or certain government enterprises, the Company believes that the credit loss exposure on these securities is remote and applies a zero credit loss assumption. When the Company does not intend to sell the impaired AFS debt security and it is more-likely-than-not that the Company will not be required to sell the impaired debt security prior to recovery of its amortized cost basis, the credit component of the unrealized loss of the impaired AFS debt security is recognized as an allowance for credit losses, with a corresponding Provision for credit losses on the Consolidated Statement of Income and the non-credit component is recognized in Other comprehensive income (loss) on the Consolidated Statement of Comprehensive Income, net of applicable taxes. At each reporting period, the Company increases or decreases the allowance for credit losses as appropriate, while limiting reversals of the allowance for credit losses to the extent of the amounts previously recorded. If the Company intends to sell the impaired debt security or it is more-likely-than-not that the Company will be required to sell the impaired debt security prior to recovering its amortized cost basis, the entire impairment amount is recognized as an adjustment to the debt security’s amortized cost basis, with a corresponding Provision for credit losses on the Consolidated Statement of Income. The amortized cost of the Company’s AFS debt securities excludes accrued interest, which is included in Other assets on the Consolidated Balance Sheet. The Company has made an accounting policy election to not recognize an allowance for credit losses for accrued interest receivables on AFS debt securities as the Company reverses any accrued interest if a debt security is impaired. As each AFS debt security has a unique security structure, where the accrual status is clearly determined when certain criteria listed in the terms are met, the Company assesses the default status of each security as defined by the debt security’s specific security structure. Allowance for Collateral-Dependent Financial Assets — A financial asset is considered collateral-dependent if repayment is expected to be provided substantially through the operation or sale of the collateral. The allowance for credit losses is measured on an individual basis for collateral-dependent financial assets and determined by comparing the fair value of the collateral, minus the cost to sell, to the amortized cost basis of the related financial asset at the reporting date. Other than impaired loans, collateral-dependent financial assets could also include resale agreements. In arrangements which the borrower must continually adjust the collateral securing the asset to reflect changes in the collateral’s fair value (e.g., resale agreements), the Company estimates the expected credit losses on the basis of the unsecured portion of the amortized cost as of the balance sheet date. If the fair value of the collateral is equal to or greater than the amortized cost of the resale agreement, the expected losses would be zero. If the fair value of the collateral is less than the amortized cost of the asset, the expected losses are limited to the difference between the fair value of the collateral and the amortized cost basis of the resale agreement. Allowance for Purchased Credit Deteriorated Assets — ASU 2016-13 replaces the concept of PCI accounting under ASC 310-30 Receivables - Loans and Debt Securities Acquired with Deteriorated Credit Quality with the concept of purchased financial assets with credit deterioration. The Company adopted ASU 2016-13 using the prospective transition approach for Purchased credit deteriorated (“PCD”) assets that were previously classified as PCI assets. PCD financial assets are defined as acquired individual financial assets (or groups with similar risk characteristics) that as of the date of acquisition, have experienced a more-than-insignificant deterioration in credit quality since origination. For PCD debt securities and PCD loans, the company records the allowance for credit losses by grossing up the initial amortized cost, which includes the purchase price and the allowance for credit losses. The expected credit losses of PCD debt securities are measured at the individual security level. The expected credit losses for PCD loans are measured based on the loan’s unpaid principal balance. Beginning January 1, 2020, for any asset designated as a PCD asset at the time of acquisition, the Company estimates and records an allowance for credit losses, which is added to the purchase price to establish the initial amortized cost basis of the financial asset. Hence, there is no income statement impact from the acquisition. Subsequent changes in the allowance for credit losses on PCD assets will be recognized in Provision for credit losses on the Consolidated Statement of Income. The noncredit discount or premium will be accreted to interest income based on the effective interest rate on the PCD assets determined after the gross-up for the allowance for credit losses. Troubled Debt Restructurings — The Company has implemented various loan modification programs to provide its borrowers relief from the economic impacts of the Coronavirus Disease 2019 (“COVID-19”). In accordance with the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”), the Company has elected to not apply TDR classification to any COVID-19 related loan modifications that were performed after March 1, 2020 to borrowers who were current as of December 31, 2019. For loans modified in response to the COVID-19 pandemic that do not meet the CARES Act criteria (e.g., current payment status at December 31, 2019), the Company has applied the guidance included in “Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customer Affected by the Coronavirus (Revised)” (the “Interagency Statement”) issued by the federal banking regulators on April 7, 2020. The Interagency Statement states that loan modifications performed in light of the COVID-19 pandemic, including loan payment deferrals that are up to six months in duration, that were granted to borrowers who were current as of the implementation date of a loan modification program or modifications granted under government mandated modification programs, are not TDRs. The delinquency of the loans modified under the CARES Act and Interagency Statement is frozen at the time of the modification, and interest income continues to be recognized over the contractual life of the loan. For more information on the Company's TDR accounting, see Note 1 — Summary of Significant Accounting Principles — Troubled Debt Restructurings to the Consolidated Financial Statements of the Company’s 2019 Annual Report on Form 10-K. Paycheck Protection Program (“PPP”) — In April 2020, the Company started accepting PPP applications and began to originate loans to qualified small businesses under the PPP established by the CARES Act. These loans are included in the C&I portfolio, carry an interest rate of 1%, and are 100% guaranteed by the Small Business Administration (“SBA”). No allowance for loan losses were recorded for these loans as of June 30, 2020. As of June 30, 2020, the Company has funded over 7,200 PPP loans for customers with an outstanding loan balance totaling $1.75 billion. The majority of the Company’s PPP loans have a term of two years. The SBA pays the Company fees for processing PPP loans in the following amounts: (1) five percent for loans of not more than $350,000; (2) three percent for loans of more than $350,000 and less than $2,000,000; and (3) one percent for loans of at least $2,000,000. Loan processing fees paid to the Company by the SBA are accounted for as loan origination fees, where net deferred fees are recognized over the estimated life of the loan as a yield adjustment on the loans. Payments by borrowers on PPP loans begin ten months after the loan forgiveness covered period. Under the terms of the PPP, such loans are eligible to be forgiven if certain conditions are satisfied, in which case the SBA will make payments to the Company for the forgiven amounts. If a loan is paid off or forgiven by the SBA prior to its projected estimated life, the remaining unamortized deferred fees will be recognized as interest income in that period.

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- Definition The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=113356391&loc=SL49131195-203048 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -URI http://asc.fasb.org/topic&trid=2122394 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=113356391&loc=SL49131195-203048 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section S99 -Paragraph 6 -URI 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v3.20.2

Fair Value Measurement and Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurement and Fair Value of Financial Instruments	Fair Value Measurement and Fair Value of Financial Instruments Fair Value Determination Fair value is defined as the price that would be received to sell an asset or the price that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. In determining the fair value of financial instruments, the Company uses various methods including market and income approaches. Based on these approaches, the Company utilizes certain assumptions that market participants would use in pricing an asset or a liability. These inputs can be readily observable, market corroborated or generally unobservable. The Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy noted below is based on the quality and reliability of the information used to determine fair value. The fair value hierarchy gives the highest priority to quoted prices available in active markets and the lowest priority to data lacking transparency. The fair value of the Company’s assets and liabilities is classified and disclosed in one of the following three categories: •Level 1 — Valuation is based on quoted prices for identical instruments traded in active markets. •Level 2 — Valuation is based on quoted prices for similar instruments traded in active markets; quoted prices for identical or similar instruments traded in markets that are not active; and model-derived valuations whose inputs are observable and can be corroborated by market data. •Level 3 — Valuation is based on significant unobservable inputs for determining the fair value of assets or liabilities. These significant unobservable inputs reflect assumptions that market participants may use in pricing the assets or liabilities. The classification of assets and liabilities within the hierarchy is based on whether inputs to the valuation methodology used are observable or unobservable, and the significance of those inputs in the fair value measurement. The Company’s assets and liabilities are classified in their entirety based on the lowest level of input that is significant to their fair value measurements. Assets and Liabilities Measured at Fair Value on a Recurring Basis The following section describes the valuation methodologies used by the Company to measure financial assets and liabilities on a recurring basis, as well as the general classification of these instruments pursuant to the fair value hierarchy. Available-for-Sale Debt Securities — When available, the Company uses quoted market prices to determine the fair value of AFS debt securities, which are classified as Level 1. Level 1 AFS debt securities are comprised of U.S. Treasury securities. The fair value of other AFS debt securities is generally determined by independent external pricing service providers who have experience in valuing these securities or by taking the average quoted market prices obtained from independent external brokers. The valuations provided by the third-party pricing service providers are based on observable market inputs, which include benchmark yields, reported trades, issuer spreads, benchmark securities, bids, offers, prepayment expectation and reference data obtained from market research publications. Inputs used by the third-party pricing service providers in valuing collateralized mortgage obligations and other securitization structures also include new issue data, monthly payment information, whole loan collateral performance, tranche evaluation and “To Be Announced” prices. In valuing securities issued by state and political subdivisions, inputs used by third-party pricing service providers also include material event notices. On a monthly basis, the Company validates the valuations provided by third-party pricing service providers to ensure that the fair value determination is consistent with the applicable accounting guidance and the financial instruments are properly classified in the fair value hierarchy. To perform this validation, the Company evaluates the fair values of securities by comparing the fair values provided by the third-party pricing service providers to prices from other available independent sources for the same securities. When variances in prices are identified, the Company further compares inputs used by different sources to ascertain the reliability of these sources. On a quarterly basis, the Company reviews the documentation received from the third-party pricing service providers regarding the valuation inputs and methodology used for each category of securities. When pricing is unavailable from third-party pricing service providers for certain securities, the Company requests market quotes from various independent external brokers and utilizes the average quoted market prices. These valuations are based on observable inputs in the current marketplace and are classified as Level 2. The Company periodically communicates with the independent external brokers to validate their pricing methodology. Information such as pricing sources, pricing assumptions, data inputs and valuation technique are reviewed. Equity Securities — Equity securities consisted of mutual funds as of both June 30, 2020 and December 31, 2019. The Company uses net asset value (“NAV”) information to determine the fair value of these equity securities. When NAV is available periodically and the equity securities can be put back to the transfer agents at the publicly available NAV, the fair value of the equity securities is classified as Level 1. When NAV is available periodically but the equity securities may not be readily marketable at its periodic NAV in the secondary market, the fair value of these equity securities is classified as Level 2. Interest Rate Contracts — The Company enters into interest rate swap and option contracts with its borrowers to lock in attractive intermediate and long-term interest rates, resulting in the customer obtaining a synthetic fixed-rate loan. To economically hedge against the interest rate risks in the products offered to its customers, the Company enters into mirrored offsetting interest rate contracts with third-party financial institutions. The Company also enters into interest rate swap contracts with institutional counterparties to hedge against certificates of deposit issued and certain variable interest rate borrowings. The fair value of the interest rate swaps is determined using the market standard methodology of netting the discounted future fixed cash payments (or receipts) and the discounted expected variable cash receipts (or payments). The fair value of the interest rate options, which consist of floors and caps, is determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates fall below (rise above) the strike rate of the floors (caps). In addition, to comply with the provisions of ASC 820, Fair Value Measurement, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements of its derivatives. The credit valuation adjustments associated with the Company’s derivatives utilize model-derived credit spreads, which are Level 3 inputs. As of June 30, 2020 and December 31, 2019, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of these interest rate contracts and has determined that the credit valuation adjustments were not significant to the overall valuation of its derivative portfolios. As a result, the Company classifies these derivative instruments as Level 2 due to the observable nature of the significant inputs utilized. Foreign Exchange Contracts — The Company enters into foreign exchange contracts to accommodate the business needs of its customers. For a majority of the foreign exchange contracts entered with its customers, the Company entered into offsetting foreign exchange contracts with third-party financial institutions to manage its exposure. The Company also utilizes foreign exchange contracts that are not designated as hedging instruments to mitigate the economic effect of fluctuations in certain foreign currency on-balance sheet assets and liabilities, primarily foreign currency denominated deposits that it offers to its customers. The fair value is determined at each reporting period based on changes in the foreign exchange rates. These are over-the-counter contracts where quoted market prices are not readily available. Valuation is measured using conventional valuation methodologies with observable market data. Due to the short-term nature of the majority of these contracts, the counterparties’ credit risks are considered nominal and result in no adjustments to the valuation of the foreign exchange contracts. Due to the observable nature of the inputs used in deriving the fair value of these contracts, the valuation of foreign exchange contracts are classified as Level 2. As of June 30, 2020 and December 31, 2019, the Bank held foreign currency non-deliverable forward contracts to hedge its net investment in its China subsidiary, East West Bank (China) Limited, a non-U.S. dollar (“USD”) functional currency subsidiary in China. These foreign currency non-deliverable forward contracts were designated as net investment hedges. The fair value of foreign currency contracts is determined by comparing the contracted foreign exchange rate to the current market foreign exchange rate. Key inputs of the current market exchange rate include spot rates and forward rates of the contractual currencies. Foreign exchange forward curves are used to determine which forward rate pertains to a specific maturity. Due to the observable nature of the inputs used in deriving the estimated fair value, these instruments are classified as Level 2. Credit Contracts — The Company may periodically enter into credit risk participation agreements (“RPAs”) to manage the credit exposure on interest rate contracts associated with the syndicated loans. The Company may enter into protection sold or protection purchased RPAs with institutional counterparties. The fair value of RPAs is calculated by determining the total expected asset or liability exposure of the derivatives to the borrowers and applying the borrowers’ credit spread to that exposure. Total expected exposure incorporates both the current and potential future exposure of the derivatives, derived from using observable inputs, such as yield curves and volatilities. The majority of the inputs used to value the RPAs are observable. Accordingly, RPAs fall within Level 2. Equity Contracts — As part of the loan origination process, from time to time, the Company obtains warrants to purchase preferred and/or common stock of technology and life sciences companies it provides loans to. As of June 30, 2020 and December 31, 2019, the warrants included on the Consolidated Financial Statements were from both public and private companies. The Company values these warrants based on the Black-Scholes option pricing model. For warrants from public companies, the model uses the underlying stock price, stated strike price, warrant expiration date, risk-free interest rate based on a duration-matched U.S. Treasury rate and market-observable company-specific option volatility as inputs to value the warrants. Due to the observable nature of the inputs used in deriving the estimated fair value, warrants from public companies are classified as Level 2. For warrants from private companies, the model uses inputs such as the offering price observed in the most recent round of funding, stated strike price, warrant expiration date, risk-free interest rate based on duration-matched U.S. Treasury rate and option volatility. The Company applies proxy volatilities based on the industry sectors of the private companies. The model values are then adjusted for a general lack of liquidity due to the private nature of the underlying companies. Due to the unobservable nature of the option volatility and liquidity discount assumptions used in deriving the estimated fair value, warrants from private companies are classified as Level 3. Since both option volatility and liquidity discount assumptions are subject to management’s judgment, measurement uncertainty is inherent in the valuation of private companies’ warrants. Given that the Company holds long positions in all warrants, an increase in volatility assumption would generally result in an increase in fair value. A higher liquidity discount would result in a decrease in fair value. On a quarterly basis, the changes in the fair value of warrants from private companies are reviewed for reasonableness, and a measurement uncertainty analysis on the option volatility and liquidity discount assumptions is performed. Commodity Contracts — The Company enters into energy commodity contracts in the form of swaps and options with its commercial loan customers to allow them to hedge against the risk of fluctuation in energy commodity prices. The fair value of the commodity option contracts is determined using the Black-Scholes model and assumptions that include expectations of future commodity price and volatility. The future commodity contract price is derived from observable inputs such as the market price of the commodity. Commodity swaps are structured as an exchange of fixed cash flows for floating cash flows. The fixed cash flows are predetermined based on the known volumes and fixed price as specified in the swap agreement. The floating cash flows are correlated with the change of forward commodity prices, which is derived from market corroborated futures settlement prices. The fair value of the commodity swaps is determined using the market standard methodology of netting the discounted future fixed cash payments (or receipts) and the discounted expected variable cash receipts (or payments) based on the market prices of the commodity. As a result, the Company classifies these derivative instruments as Level 2 due to the observable nature of the significant inputs utilized. The following tables present financial assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2020 and December 31, 2019: ($ in thousands) Assets and Liabilities Measured at Fair Value on a Recurring Basis as of June 30, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fair Value AFS debt securities: U.S. Treasury securities $ 251,201    $ —    $ —    $ 251,201    U.S. government agency and U.S. government- sponsored enterprise debt securities —    442,644    —    442,644    U.S. government agency and U.S. government- sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities —    858,440    —    858,440    Residential mortgage-backed securities —    1,280,895    —    1,280,895    Municipal securities —    215,184    —    215,184    Non-agency mortgage-backed securities: Commercial mortgage-backed securities —    151,368    —    151,368    Residential mortgage-backed securities —    114,338    —    114,338    Corporate debt securities —    30,826    —    30,826    Foreign bonds —    204,080    —    204,080    Asset-backed securities —    61,619    —    61,619    Collateralized loan obligations (“CLOs”) —    273,979    —    273,979    Total AFS debt securities $ 251,201    $ 3,633,373    $ —    $ 3,884,574    Investments in tax credit and other investments: Equity securities (1) $ 22,462    $ 8,680    $ —    $ 31,142    Total investments in tax credit and other investments $ 22,462    $ 8,680    $ —    $ 31,142    Derivative assets: Interest rate contracts $ —    $ 613,480    $ —    $ 613,480    Foreign exchange contracts —    24,289    —    24,289    Credit contracts —    41    —    41    Equity contracts —    8,857    316    9,173    Commodity contracts —    117,447    —    117,447    Gross derivative assets $ —    $ 764,114    $ 316    $ 764,430    Netting adjustments (2) $ —    $ (122,218)   $ —    $ (122,218)   Net derivative assets $ —    $ 641,896    $ 316    $ 642,212    Derivative liabilities: Interest rate contracts $ —    $ 401,803    $ —    $ 401,803    Foreign exchange contracts —    19,741    —    19,741    Credit contracts —    327    —    327    Commodity contracts —    138,298    —    138,298    Gross derivative liabilities $ —    $ 560,169    $ —    $ 560,169    Netting adjustments (2) $ —    $ (205,004)   $ —    $ (205,004)   Net derivative liabilities $ —    $ 355,165    $ —    $ 355,165    (1)Equity securities consist of mutual funds with readily determinable fair values. (2)Represents balance sheet netting of derivative assets and liabilities and related cash collateral under master netting agreements or similar agreements. See Note 6 — Derivatives to the Consolidated Financial Statements in this Form 10-Q for additional information. ($ in thousands) Assets and Liabilities Measured at Fair Value on a Recurring Basis as of December 31, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fair Value AFS debt securities: U.S. Treasury securities $ 176,422    $ —    $ —    $ 176,422    U.S. government agency and U.S. government- sponsored enterprise debt securities —    581,245    —    581,245    U.S. government agency and U.S. government- sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities —    603,471    —    603,471    Residential mortgage-backed securities —    1,003,897    —    1,003,897    Municipal securities —    102,302    —    102,302    Non-agency mortgage-backed securities: Commercial mortgage-backed securities —    88,550    —    88,550    Residential mortgage-backed securities —    46,548    —    46,548    Corporate debt securities —    11,149    —    11,149    Foreign bonds —    354,172    —    354,172    Asset-backed securities —    64,752    —    64,752    CLOs —    284,706    —    284,706    Total AFS debt securities $ 176,422    $ 3,140,792    $ —    $ 3,317,214    Investments in tax credit and other investments: Equity securities (1) $ 21,746    $ 9,927    $ —    $ 31,673    Total investments in tax credit and other investments $ 21,746    $ 9,927    $ —    $ 31,673    Derivative assets: Interest rate contracts $ —    $ 192,883    $ —    $ 192,883    Foreign exchange contracts —    54,637    —    54,637    Credit contracts —    2    —    2    Equity contracts —    993    421    1,414    Commodity contracts —    81,380    —    81,380    Gross derivative assets $ —    $ 329,895    $ 421    $ 330,316    Netting adjustments (2) $ —    $ (125,319)   $ —    $ (125,319)   Net derivative assets $ —    $ 204,576    $ 421    $ 204,997    Derivative liabilities: Interest rate contracts $ —    $ 127,317    $ —    $ 127,317    Foreign exchange contracts —    48,610    —    48,610    Credit contracts —    84    —    84    Commodity contracts —    80,517    —    80,517    Gross derivative liabilities $ —    $ 256,528    $ —    $ 256,528    Netting adjustments (2) $ —    $ (159,799)   $ —    $ (159,799)   Net derivative liabilities $ —    $ 96,729    $ —    $ 96,729    (1)Equity securities consist of mutual funds with readily determinable fair values. (2)Represents balance sheet netting of derivative assets and liabilities and related cash collateral under master netting agreements or similar agreements. See Note 6 — Derivatives to the Consolidated Financial Statements in this Form 10-Q for additional information. For the three and six months ended June 30, 2020 and 2019, Level 3 fair value measurements that were measured on a recurring basis consist of warrants issued by private companies. The following table provides a reconciliation of the beginning and ending balances of these equity warrants for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Equity Contracts Beginning balance $ 713    $ 442    $ 421    $ 673    Total gains included in earnings (1) 7,976    769    8,268    538    Issuances —    28    —    28    Settlements —    (847)   —    (847)   Transfers out of Level 3 (2) (8,373)   —    (8,373)   —    Ending balance $ 316    $ 392    $ 316    $ 392    (1)Includes unrealized gains (losses) of $8.0 million and $(4) thousand for the three months ended June 30, 2020 and 2019, respectively, and $8.3 million and $(235) thousand for the six months ended June 30, 2020 and 2019, respectively. The realized/unrealized gains (losses) of equity warrants are included in Lending fees on the Consolidated Statement of Income. (2)During the three and six months ended June 30, 2020, the Company transferred $8.4 million of equity contracts measured on a recurring basis out of Level 3 into Level 2 after the corresponding issuer of the equity warrant, which was previously a private company, completed its initial public offering and became a public company. The following table presents quantitative information about the significant unobservable inputs used in the valuation of Level 3 fair value measurements as of June 30, 2020 and December 31, 2019, respectively. The significant unobservable inputs presented in the table below are those that the Company considers significant to the fair value of the Level 3 assets. The Company considers unobservable inputs to be significant if, by their exclusion, the fair value of the Level 3 assets would be impacted by a predetermined percentage change. ($ in thousands) Fair Value Measurements (Level 3) Valuation Technique Unobservable Inputs Range of Inputs Weighted- Average (1) June 30, 2020 Derivative assets: Equity contracts $ 316    Black-Scholes option pricing model Equity volatility 58% — 70% 63% Liquidity discount 47% 47% December 31, 2019 Derivative assets: Equity contracts $ 421    Black-Scholes option pricing model Equity volatility 39% — 44% 42% Liquidity discount 47% 47% (1)Weighted-average is calculated based on fair value of equity warrants as of June 30, 2020 and December 31, 2019. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Assets measured at fair value on a nonrecurring basis include certain loans, investments in qualified affordable housing partnerships, tax credit and other investments, OREO, loans held-for-sale, and other nonperforming assets. Nonrecurring fair value adjustments result from impairment on certain loans and investments in qualified affordable housing partnerships, tax credit and other investments, write-downs of OREO, or from the application of lower of cost or fair value on loans held-for-sale. Individually Evaluated Loans — The Company typically adjusts the carrying amount of individually evaluated loans when there is evidence of probable loss and when the expected fair value of the loan is less than its carrying amount. Individually evaluated loans with specific reserves are classified as Level 3 assets. The following two methods are used to derive the fair value of individually evaluated loans: •Discounted cash flows valuation techniques that consist of developing an expected stream of cash flows over the life of the loans and then valuing the loans at the present value by discounting the expected cash flows at a designated discount rate. •A specific reserve is established for an individually evaluated loan based on the fair value of the underlying collateral, which may take the form of real estate, inventory, equipment, contracts or guarantees. The fair value of the underlying collateral is generally based on third-party appraisals, or an internal valuation if a third-party appraisal is not required by regulations, which utilize one or more valuation techniques such as income, market and/or cost approaches. Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net — As part of its monitoring process, the Company conducts ongoing due diligence on the investments in its qualified affordable housing partnerships, tax credit and other investments after the initial investment date and prior to the placed-in-service-date. After these investments are either acquired or placed into service, periodic monitoring is performed. This includes the quarterly review of the financial statements of the investment entity, the annual review of the financial statements of the guarantor (if any), the review of the annual tax returns of the investment entity, and the comparison of the actual cash distributions received against the financial projections prepared at the time when the investment was made. The Company assesses its tax credit and other investments for possible OTTI on an annual basis or when events or circumstances suggest that the carrying amount of the investments may not be realizable. These circumstances can include, but are not limited to the following factors: •The expected future cash flows is less than the carrying amount of the investment; •Changes in the economic, market or technological environment that could adversely affect the investee’s operations; and •Other factors that raise doubt about the investee’s ability to continue as a going concern, such as negative cash flows from operations and the continuing prospects of the underlying operations of the investment. All available evidence is considered in assessing whether a decline in value is other-than-temporary. Generally, none of the aforementioned factors are individually conclusive and the relative importance placed on individual facts may vary depending on the situation. In accordance with ASC 323-10-35-32, an impairment charge would only be recognized in earnings for a decline in value that is determined to be other-than-temporary. Other Real Estate Owned — The Company’s OREO represents properties acquired through foreclosure, or through full or partial satisfaction of loans held-for-investment. These OREO properties are recorded at estimated fair value less the costs to sell at the time of foreclosure or at the lower of cost or estimated fair value less the costs to sell subsequent to acquisition. On a monthly basis, the current fair market value of each OREO property is reviewed to ensure that the current carrying value is appropriate. OREO properties are classified as Level 3. Other Nonperforming Assets — Other nonperforming assets are recorded at fair value upon transfers from loans to foreclosed assets. Subsequently, foreclosed assets are recorded at the lower of carrying value or fair value. Fair value is based on independent market prices, appraised values of the collateral or management’s estimates of the foreclosed asset. The Company records an impairment when the foreclosed asset’s fair value declines below its carrying value. Other nonperforming assets are classified as Level 3. The following tables present the carrying amounts of assets that were still held and had fair value changes measured on a nonrecurring basis as of June 30, 2020 and December 31, 2019: ($ in thousands) Assets Measured at Fair Value on a Nonrecurring Basis as of June 30, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fair Value Measurements Individually evaluated loans (1): Commercial: C&I $ —    $ —    $ 53,122    $ 53,122    CRE: CRE —    —    50,453    50,453    Total commercial —    —    103,575    103,575    Consumer: Residential mortgage: HELOCs —    —    3,338    3,338    Other consumer —    —    2,491    2,491    Total consumer —    —    5,829    5,829    Total individually evaluated loans $ —    $ —    $ 109,404    $ 109,404    Investments in tax credit and other investments, net $ —    $ —    $ 6,216    $ 6,216    ($ in thousands) Assets Measured at Fair Value on a Nonrecurring Basis as of December 31, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fair Value Measurements Non-PCI impaired loans: Commercial: C&I $ —    $ —    $ 47,554    $ 47,554    CRE: CRE —    —    753    753    Total commercial —    —    48,307    48,307    Consumer: Residential mortgage: HELOCs —    —    1,372    1,372    Total consumer —    —    1,372    1,372    Total non-PCI impaired loans $ —    $ —    $ 49,679    $ 49,679    OREO (2) $ —    $ —    $ 125    $ 125    Investments in tax credit and other investments, net $ —    $ —    $ 3,076    $ 3,076    Other nonperforming assets $ —    $ —    $ 1,167    $ 1,167    (1)The Company adopted ASU 2016-13 using the prospective transition approach for PCD loans that were previously accounted for as PCI loans. Total individually evaluated loans as of June 30, 2020 considers PCD loans, if impaired, whereas the impaired loans as of December 31, 2019 include only non-PCI loans. (2)Amounts are included in Other assets on the Consolidated Balance Sheet and represent the carrying value of OREO properties that were written down subsequent to their initial classification as OREO. The following table presents the increase (decrease) in fair value of assets for which a nonrecurring fair value adjustment has been recognized for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Individually Evaluated Loans (1) Non-PCI Impaired Loans Individually Evaluated Loans (1) Non-PCI Impaired Loans Loans: Commercial: C&I $ (8,846)   $ (24,001)   $ (30,372)   $ (25,823)   CRE: CRE (271)   2    (276)   4    Total commercial (9,117)   (23,999)   (30,648)   (25,819)   Consumer: Residential mortgage: HELOCs (64)   —    (257)   —    Other consumer —    —    2,491    —    Total consumer (64)   —    2,234    —    Total loans $ (9,181)   $ (23,999)   $ (28,414)   $ (25,819)   OREO $ —    $ (3)   $ —    $ (3)   Investments in tax credit and other investments, net $ (733)   $ (2,892)   $ (583)   $ (9,870)   Other nonperforming assets $ —    $ —    $ —    $ (3,000)   (1)The Company adopted ASU 2016-13 using the prospective transition approach for PCD loans that were previously accounted for as PCI loans. Total individually evaluated loans during the three and six months ended June 30, 2020 considers PCD loans, if impaired, whereas impaired loans during the three and six months ended June 30, 2019 include only non-PCI loans. The following table presents the quantitative information about the significant unobservable inputs used in the valuation of Level 3 fair value measurements that are measured on a nonrecurring basis as of June 30, 2020 and December 31, 2019: ($ in thousands) Fair Value Measurements (Level 3) Valuation Techniques Unobservable Inputs Range of  Inputs Weighted- Average of Inputs (1) June 30, 2020 Individually evaluated loans (2) $ 29,949    Discounted cash flows Discount 4% — 15% 10% $ 5,658    Fair value of collateral Discount 10% — 63% 19% $ 21,452    Fair value of collateral Contract value NM NM $ 52,345    Fair value of property Selling cost 8% 8% Investments in tax credit and other investments, net $ 6,216    Individual analysis of each investment Expected future tax benefits and distributions NM NM December 31, 2019 Non-PCI impaired loans $ 27,841    Discounted cash flows Discount 4% — 15% 14% $ 1,014    Fair value of collateral Discount 8% — 20% 19% $ 20,824    Fair value of collateral Contract value NM NM OREO $ 125    Fair value of property Selling cost 8% 8% Other nonperforming assets $ 1,167    Fair value of collateral Contract value NM NM Investments in tax credit and other investments, net $ 3,076    Individual analysis of each investment Expected future tax benefits and distributions NM NM NM — Not meaningful. (1)Weighted-average of inputs is based on the relative fair value of the respective assets as of June 30, 2020 and December 31, 2019. (2)The Company adopted ASU 2016-13 using the prospective transition approach for PCD loans that were previously accounted for as PCI loans. Total individually evaluated loans as of June 30, 2020 considers PCD loans, if impaired, whereas the impaired loans as of December 31, 2019 include only non-PCI loans. Disclosures about Fair Value of Financial Instruments The following tables present the fair value estimates for financial instruments as of June 30, 2020 and December 31, 2019, excluding financial instruments recorded at fair value on a recurring basis as they are included in the tables presented elsewhere in this Note. The carrying amounts in the following tables are recorded on the Consolidated Balance Sheet under the indicated captions, except for accrued interest receivable and mortgage servicing rights that are included in Other assets, and accrued interest payable that is included in Accrued expenses and other liabilities. These financial assets and liabilities are measured at amortized cost basis on the Company’s Consolidated Balance Sheet. ($ in thousands) June 30, 2020 Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value Financial assets: Cash and cash equivalents $ 4,533,502    $ 4,533,502    $ —    $ —    $ 4,533,502    Interest-bearing deposits with banks $ 531,591    $ —    $ 531,591    $ —    $ 531,591    Resale agreements (1) $ 1,260,000    $ —    $ 1,263,068    $ —    $ 1,263,068    Restricted equity securities, at cost $ 78,963    $ —    $ 78,963    $ —    $ 78,963    Loans held-for-sale $ 3,875    $ —    $ 3,875    $ —    $ 3,875    Loans held-for-investment, net $ 36,597,341    $ —    $ —    $ 36,714,052    $ 36,714,052    Mortgage servicing rights $ 5,363    $ —    $ —    $ 7,798    $ 7,798    Accrued interest receivable $ 149,595    $ —    $ 149,595    $ —    $ 149,595    Financial liabilities: Demand, checking, savings and money market deposits $ 31,410,130    $ —    $ 31,410,130    $ —    $ 31,410,130    Time deposits $ 9,262,548    $ —    $ 9,295,199    $ —    $ 9,295,199    Short-term borrowings $ 252,851    $ —    $ 252,851    $ —    $ 252,851    FHLB advances $ 656,759    $ —    $ 667,996    $ —    $ 667,996    Repurchase agreements (1) $ 300,000    $ —    $ 320,361    $ —    $ 320,361    Long-term debt $ 1,575,653    $ —    $ 1,578,801    $ —    $ 1,578,801    Accrued interest payable $ 23,007    $ —    $ 23,007    $ —    $ 23,007    ($ in thousands) December 31, 2019 Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value Financial assets: Cash and cash equivalents $ 3,261,149    $ 3,261,149    $ —    $ —    $ 3,261,149    Interest-bearing deposits with banks $ 196,161    $ —    $ 196,161    $ —    $ 196,161    Resale agreements (1) $ 860,000    $ —    $ 856,025    $ —    $ 856,025    Restricted equity securities, at cost $ 78,580    $ —    $ 78,580    $ —    $ 78,580    Loans held-for-sale $ 434    $ —    $ 434    $ —    $ 434    Loans held-for-investment, net $ 34,420,252    $ —    $ —    $ 35,021,300    $ 35,021,300    Mortgage servicing rights $ 6,068    $ —    $ —    $ 8,199    $ 8,199    Accrued interest receivable $ 144,599    $ —    $ 144,599    $ —    $ 144,599    Financial liabilities: Demand, checking, savings and money market deposits $ 27,109,951    $ —    $ 27,109,951    $ —    $ 27,109,951    Time deposits $ 10,214,308    $ —    $ 10,208,895    $ —    $ 10,208,895    Short-term borrowings $ 28,669    $ —    $ 28,669    $ —    $ 28,669    FHLB advances $ 745,915    $ —    $ 755,371    $ —    $ 755,371    Repurchase agreements (1) $ 200,000    $ —    $ 232,597    $ —    $ 232,597    Long-term debt $ 147,101    $ —    $ 152,641    $ —    $ 152,641    Accrued interest payable $ 27,246    $ —    $ 27,246    $ —    $ 27,246    (1)Resale and repurchase agreements are reported net pursuant to ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements. As of June 30, 2020, none of the $300.0 million of gross repurchase agreements were eligible for netting against gross resale agreements. Out of $450.0 million of gross repurchase agreements, $250.0 million were eligible for netting against gross resale agreements as of December 31, 2019

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- References No definition available. + Details Name: us-gaap_FairValueDisclosuresAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details Name: us-gaap_FairValueDisclosuresTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements	6 Months Ended
	Jun. 30, 2020
RESALE AND REPURCHASE AGREEMENTS [Abstract]
Securities Purchased under Resale Agreements and Sold under Repurchase Agreements	Securities Purchased under Resale Agreements and Sold under Repurchase Agreements Resale Agreements Gross resale agreements were $1.26 billion and $1.11 billion as of June 30, 2020 and December 31, 2019, respectively. The weighted-average yields were 2.14% and 2.71% for the three months ended June 30, 2020 and 2019, respectively, and 2.32% and 2.77% for the six months ended June 30, 2020 and 2019, respectively. Repurchase Agreements As of June 30, 2020, the collateral for the repurchase agreements were comprised of U.S. Treasury securities, and U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities. Gross repurchase agreements were $300.0 million and $450.0 million as of June 30, 2020 and December 31, 2019, respectively. The weighted-average interest rates were 3.40% and 4.93% for the three months ended June 30, 2020 and 2019, respectively, and 3.76% and 4.97% for the six months ended June 30, 2020 and 2019, respectively. The Company recorded $8.7 million of charges related to the extinguishment of $150.0 million of repurchase agreements for the three and six months ended June 30, 2020. In comparison, there were no extinguishment charges recorded in 2019. As of June 30, 2020, $300.0 million of repurchase agreements will mature in 2023. Balance Sheet Offsetting The Company’s resale and repurchase agreements are transacted under legally enforceable master repurchase agreements that provide the Company, in the event of default by the counterparty, the right to liquidate securities held and to offset receivables and payables with the same counterparty. The Company nets resale and repurchase transactions with the same counterparty on the Consolidated Balance Sheet when it has a legally enforceable master netting agreement and the transactions are eligible for netting under ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements. Collateral received includes securities that are not recognized on the Consolidated Balance Sheet. Collateral pledged consists of securities that are not netted on the Consolidated Balance Sheet against the related collateralized liability. Collateral received or pledged in resale and repurchase agreements with other financial institutions may also be sold or re-pledged by the secured party, and is usually delivered to and held by the third-party trustees. The collateral amounts received/pledged are limited for presentation purposes to the related recognized asset/liability balance for each counterparty, and accordingly, do not include excess collateral received/pledged. The following tables present the resale and repurchase agreements included on the Consolidated Balance Sheet as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 Gross Amounts of Recognized Assets Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts of Assets Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Assets Net Amount Collateral Received Resale agreements $ 1,260,000    $ —    $ 1,260,000    $ (1,258,866)   (1) $ 1,134    Gross Amounts of Recognized Liabilities Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts of Liabilities Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Liabilities Net Amount Collateral Pledged Repurchase agreements $ 300,000    $ —    $ 300,000    $ (300,000)   (2) $ —    ($ in thousands) December 31, 2019 Gross Amounts of Recognized Assets Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts of Assets Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Assets Net Amount Collateral Received Resale agreements $ 1,110,000    $ (250,000)   $ 860,000    $ (856,058)   (1) $ 3,942    Gross Amounts of Recognized Liabilities Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts of Liabilities Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Liabilities Net Amount Collateral Pledged Repurchase agreements $ 450,000    $ (250,000)   $ 200,000    $ (200,000)   (2) $ —    (1)Represents the fair value of securities the Company has received under resale agreements, limited for table presentation purposes to the amount of the recognized asset due from each counterparty. The application of collateral cannot reduce the net position below zero. Therefore, excess collateral, if any, is not reflected above. (2)Represents the fair value of securities the Company has pledged under repurchase agreements, limited for table presentation purposes to the amount of the recognized liability due to each counterparty. The application of collateral cannot reduce the net position below zero. Therefore, excess collateral, if any, is not reflected above. In addition to the amounts included in the tables above, the Company also has balance sheet netting related to derivatives. Refer to Note 6 — Derivatives to the Consolidated Financial Statements in this Form 10-Q for additional information.

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- Definition RESALE AND REPURCHASE AGREEMENTS [Abstract] + References No definition available. + Details Name: ewbc_RESALEANDREPURCHASEAGREEMENTSAbstract Namespace Prefix: ewbc_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition The entire disclosure for repurchase agreements (also known as repos), resale agreements (also known as reverse repurchase agreements or reverse repos), securities borrowed transactions, and securities loaned transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -URI http://asc.fasb.org/topic&trid=2197590 + Details Name: us-gaap_RepurchaseAgreementsResaleAgreementsSecuritiesBorrowedAndSecuritiesLoanedDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Securities	6 Months Ended
	Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Securities	Securities The following tables present the amortized cost, gross unrealized gains and losses, and fair value by major categories of AFS debt securities as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value AFS debt securities: U.S. Treasury securities $ 250,494    $ 707    $ —    $ 251,201    U.S. government agency and U.S. government-sponsored enterprise debt securities 433,923    8,853    (132)   442,644    U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 827,929    34,585    (4,074)   858,440    Residential mortgage-backed securities 1,246,609    34,445    (159)   1,280,895    Municipal securities 208,333    7,002    (151)   215,184    Non-agency mortgage-backed securities: Commercial mortgage-backed securities 148,322    3,989    (943)   151,368    Residential mortgage-backed securities 113,548    804    (14)   114,338    Corporate debt securities 31,254    74    (502)   30,826    Foreign bonds 204,540    106    (566)   204,080    Asset-backed securities 64,762    —    (3,143)   61,619    CLOs 294,000    —    (20,021)   273,979    Total AFS debt securities $ 3,823,714    $ 90,565    $ (29,705)   $ 3,884,574    ($ in thousands) December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value AFS debt securities: U.S. Treasury securities $ 177,215    $ —    $ (793)   $ 176,422    U.S. government agency and U.S. government-sponsored enterprise debt securities 584,275    1,377    (4,407)   581,245    U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 599,814    8,551    (4,894)   603,471    Residential mortgage-backed securities 998,447    6,927    (1,477)   1,003,897    Municipal securities 101,621    790    (109)   102,302    Non-agency mortgage-backed securities: Commercial mortgage-backed securities 86,609    1,947    (6)   88,550    Residential mortgage-backed securities 46,830    3    (285)   46,548    Corporate debt securities 11,250    12    (113)   11,149    Foreign bonds 354,481    198    (507)   354,172    Asset-backed securities 66,106    —    (1,354)   64,752    CLOs 294,000    —    (9,294)   284,706    Total AFS debt securities $ 3,320,648    $ 19,805    $ (23,239)   $ 3,317,214    As of June 30, 2020, the amortized cost of AFS debt securities excludes accrued interest receivables of $17.8 million which are included in Other assets on the Consolidated Balance Sheet. For the Company’s accounting policy related to AFS debt securities’ accrued interest receivable, see Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Form 10-Q. Unrealized Losses The following tables present the fair value and the associated gross unrealized losses of the Company’s AFS debt securities, aggregated by investment category and the length of time that the securities have been in a continuous unrealized loss position as of June 30, 2020 and December 31, 2019. ($ in thousands) June 30, 2020 Less Than 12 Months 12 Months or More Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses AFS debt securities: U.S. government agency and U.S. government sponsored enterprise debt securities $ 24,868    $ (132)   $ —    $ —    $ 24,868    $ (132)   U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 139,097    (3,477)   11,572    (597)   150,669    (4,074)   Residential mortgage-backed securities 91,491    (157)   195    (2)   91,686    (159)   Municipal securities 8,617    (151)   —    —    8,617    (151)   Non-agency mortgage-backed securities: Commercial mortgage-backed securities 59,418    (943)   —    —    59,418    (943)   Residential mortgage-backed securities 23,720    (14)   —    —    23,720    (14)   Corporate debt securities 1,002    (2)   9,500    (500)   10,502    (502)   Foreign bonds 85,274    (566)   —    —    85,274    (566)   Asset-backed securities 18,359    (483)   43,260    (2,660)   61,619    (3,143)   CLOs 273,979    (20,021)   —    —    273,979    (20,021)   Total AFS debt securities $ 725,825    $ (25,946)   $ 64,527    $ (3,759)   $ 790,352    $ (29,705)   ($ in thousands) December 31, 2019 Less Than 12 Months 12 Months or More Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses AFS debt securities: U.S. Treasury securities $ —    $ —    $ 176,422    $ (793)   $ 176,422    $ (793)   U.S. government agency and U.S. government-sponsored enterprise debt securities 310,349    (4,407)   —    —    310,349    (4,407)   U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 204,675    (2,346)   108,314    (2,548)   312,989    (4,894)   Residential mortgage-backed securities 325,354    (1,234)   34,337    (243)   359,691    (1,477)   Municipal securities 31,130    (109)   —    —    31,130    (109)   Non-agency mortgage-backed securities: Commercial mortgage-backed securities 7,914    (6)   —    —    7,914    (6)   Residential mortgage-backed securities 42,894    (285)   —    —    42,894    (285)   Corporate debt securities —    —    9,888    (113)   9,888    (113)   Foreign bonds 129,074    (407)   9,900    (100)   138,974    (507)   Asset-backed securities 52,565    (902)   12,187    (452)   64,752    (1,354)   CLOs 284,706    (9,294)   —    —    284,706    (9,294)   Total AFS debt securities $ 1,388,661    $ (18,990)   $ 351,048    $ (4,249)   $ 1,739,709    $ (23,239)   As of June 30, 2020, the Company had 41 AFS debt securities in a gross unrealized loss position with no credit impairment, primarily consisting of three CLOs, 19 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities, and four asset-backed securities. In comparison, as of December 31, 2019, the Company had 101 AFS debt securities in a gross unrealized loss position with no credit impairment, primarily consisting of three CLOs, 57 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities, and 14 U.S. government agency and U.S. government-sponsored enterprise debt securities. Allowance for Credit Losses Each reporting period, the Company assesses each AFS debt security that is in an unrealized loss position to determine whether the decline in fair value below the amortized cost basis resulted from a credit loss or other factors. For a discussion of the factors and criteria the Company uses in analyzing securities for impairment related to credit losses, see Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies — Allowance for Credit Losses on Available-for-Sale Debt Securities to the Consolidated Financial Statements in this Form 10-Q. Prior to January 1, 2020, the Company assessed individual securities that were in an unrealized loss position for OTTI. The gross unrealized losses across all major security types presented in the above tables were primarily attributable to yield curve movements and widened spreads arising from the negative outlook and uncertainty as a result of the COVID-19 pandemic. The increase in unrealized losses during the six months ended June 30, 2020 was primarily due to further deterioration in the market values of the following security types: •U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities — The market value decline was primarily due to the interest rate movement. Since these securities were guaranteed or sponsored by agencies of the U.S. government, and the credit profiles were strong (rated A, AA+ and AAA by Moody’s Investors Service (“Moody’s”), S&P and Fitch Ratings (“Fitch”), respectively), the Company expects to receive all contractual interest payments on-time, and believes the credit loss exposure on these securities is remote. •Asset-backed securities — The market value decline of these securitized student loans was primarily due to the interest rate movement and the widening in spreads. Since credit profiles of these securities were strong (rated Aa1, AA+, and AA or higher by Moody’s Investors Service, S&P and Fitch Ratings, respectively), were backed by the Federal Family Education Loan Program, and the contractual payments from these bonds have been on-time, the Company deemed that the credit loss exposure on these securities is low and no credit loss is expected. •CLOs — The market value decline was largely due to market dislocation in this sector resulting in wider liquidity spreads. The credit profiles of the securities were strong (rated A or higher by Standard and Poor's (“S&P”)) and the contractual payments from these bonds are expected to be received on-time. Accordingly, the Company believes that credit loss exposure on these securities is remote. Overall, the Company believes that the credit support levels of the AFS debt securities are strong and, based on current assessments and macroeconomic forecasts, expects that full contractual cash flows will be received even if credit performance deteriorates under the impact of the COVID-19 pandemic. As of June 30, 2020, the Company has the intent to hold the AFS debt securities with unrealized losses through the anticipated recovery period and it is more-likely-than-not that the Company will not have to sell these securities before recovery of their amortized cost. The issuers of these securities have not, to the Company’s knowledge, established any cause for default on these securities. As a result, the Company expects to recover the entire amortized cost basis of these securities. Accordingly, there was no allowance for credit losses as of June 30, 2020, and there were no provision for credit losses recognized for the three and six months ended June 30, 2020. In comparison, no OTTI credit loss was recognized for the three and six months ended June 30, 2019. Realized Gains and Losses The following table presents the proceeds, gross realized gains and tax expense related to the sales of AFS debt securities for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Proceeds from sales $ 177,917    $ 223,763    $ 484,380    $ 375,102    Gross realized gains $ 9,640    $ 1,447    $ 11,169    $ 3,008    Related tax expense $ 2,850    $ 428    $ 3,302    $ 889    Contractual Maturities of Available-for-Sale Debt Securities The following table presents the contractual maturities of AFS debt securities as of June 30, 2020. Expected maturities will differ from contractual maturities on certain securities as the issuers and borrowers of the underlying collateral may have the right to call or prepay obligations with or without prepayment penalties. ($ in thousands) Amortized Cost Fair Value Due within one year $ 561,935    $ 562,869    Due after one year through five years 366,403    371,895    Due after five years through ten years 277,823    289,730    Due after ten years 2,617,553    2,660,080    Total AFS debt securities $ 3,823,714    $ 3,884,574    As of June 30, 2020 and December 31, 2019, AFS debt securities with fair value of $745.2 million and $479.4 million, respectively, were pledged to secure public deposits, repurchase agreements and for other purposes required or permitted by law. Restricted Equity Securities The following table presents the restricted equity securities on the Consolidated Balance Sheet as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 December 31, 2019 Federal Reserve Bank (“FRB”) stock $ 58,781    $ 58,330    FHLB stock 20,182    20,250    Total restricted equity securities $ 78,963    $ 78,580

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v3.20.2

Derivatives	6 Months Ended
	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives The Company uses derivatives to manage exposure to market risk, primarily interest rate risk and foreign currency risk, and to assist customers with their risk management objectives. The Company’s goal is to manage interest rate sensitivity and volatility so that movements in interest rates do not significantly affect earnings or capital. The Company also uses foreign exchange contracts to manage the foreign exchange rate risk associated with certain foreign currency-denominated assets and liabilities, as well as the Bank’s investment in East West Bank (China) Limited. The Company recognizes all derivatives on the Consolidated Balance Sheet at fair value. While the Company designates certain derivatives as hedging instruments in a qualifying hedge accounting relationship, other derivatives consist of economic hedges. For additional information on the Company’s derivatives and hedging activities, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Derivatives to the Consolidated Financial Statements of the Company’s 2019 Form 10-K. The following table presents the total notional amounts and gross fair values of the Company’s derivatives, as well as the balance sheet netting adjustments on an aggregate basis as of June 30, 2020 and December 31, 2019. The derivative assets and liabilities are presented on a gross basis prior to the application of bilateral collateral and master netting agreements, but after the variation margin payments with central clearing organizations have been applied as settlement, as applicable. Total derivative assets and liabilities are adjusted to take into consideration the effects of legally enforceable master netting agreements and cash collateral received or paid as of June 30, 2020 and December 31, 2019. The resulting net derivative asset and liability fair values are included in Other assets and Accrued expenses and other liabilities, respectively, on the Consolidated Balance Sheet. ($ in thousands) June 30, 2020 December 31, 2019 Notional Amount Fair Value Notional Amount Fair Value Derivative Assets  Derivative Liabilities  Derivative Assets  Derivative Liabilities  Derivatives designated as hedging instruments: Fair value hedges: Interest rate contracts $ 15,194    $ —    $ 174    $ 31,026    $ —    $ 3,198    Cash flow hedges: Interest rate contracts 275,000    —    1,483    —    —    —    Net investment hedges: Foreign exchange contracts 77,689    245    —    86,167    —    1,586    Total derivatives designated as hedging instruments $ 367,883    $ 245    $ 1,657    $ 117,193    $ —    $ 4,784    Derivatives not designated as hedging instruments: Interest rate contracts $ 17,170,884    $ 613,480    $ 400,146    $ 15,489,692    $ 192,883    $ 124,119    Foreign exchange contracts 2,738,018    24,044    19,741    4,839,661    54,637    47,024    Credit contracts 204,498    41    327    210,678    2    84    Equity contracts —    (1) 9,173    —    —    (1) 1,414    —    Commodity contracts —    (2) 117,447    138,298    —    (2) 81,380    80,517    Total derivatives not designated as hedging instruments $ 20,113,400    $ 764,185    $ 558,512    $ 20,540,031    $ 330,316    $ 251,744    Gross derivative assets/liabilities $ 764,430    $ 560,169    $ 330,316    $ 256,528    Less: Master netting agreements (110,569)   (110,569)   (121,561)   (121,561)   Less: Cash collateral received/paid (11,649)   (94,435)   (3,758)   (38,238)   Net derivative assets/liabilities $ 642,212    $ 355,165    $ 204,997    $ 96,729    (1)The Company held equity contracts in three public companies and 17 private companies as of June 30, 2020. In comparison, the Company held equity contracts in three public companies and 18 private companies as of December 31, 2019. (2)The notional amount of the Company’s commodity contracts entered with its customers totaled 6,155 thousand barrels of crude oil and 84,957 thousand units of natural gas, measured in million British thermal units (“MMBTUs”) as of June 30, 2020. In comparison, the notional amount of the Company’s commodity contracts entered with its customers totaled 7,811 thousand barrels of crude oil and 63,773 thousand MMBTUs of natural gas as of December 31, 2019. The Company simultaneously entered into the offsetting commodity contracts with mirrored terms with third-party financial institutions. Derivatives Designated as Hedging Instruments Fair Value Hedges — The Company is exposed to changes in the fair value of certain certificates of deposit due to changes in the benchmark interest rates. The Company has entered into interest rate swaps, which were designated as fair value hedges. The interest rate swaps involve the exchange of variable rate payments over the life of the agreements without the exchange of the underlying notional amounts. The following table presents the net gains (losses) recognized on the Consolidated Statement of Income related to the derivatives designated as fair value hedges for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Gains (losses) recorded in interest expense: Recognized on interest rate swaps $ 951    $ 1,634    $ 2,996    $ 2,854    Recognized on certificates of deposit $ (357)   $ (1,434)   $ (1,719)   $ (2,695)   The following table presents the carrying amount and associated cumulative basis adjustment related to the application of fair value hedge accounting that is included in the carrying amount of the hedged certificates of deposit as of June 30, 2020 and December 31, 2019: ($ in thousands) Carrying Value (1) Cumulative Fair     Value Adjustment (2) June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Certificates of deposit $ (14,986)   $ (29,080)   $ (114)   $ 1,604    (1)Represents the full carrying amount of the hedged certificates of deposit. (2)For liabilities, (increase) decrease to carrying value. Cash Flow Hedges — The Company entered into interest rate swaps that were designated and qualified as cash flow hedges in the second quarter of 2020 to hedge the variability in interest payments on certain floating rate borrowings. For cash flow hedges, the entire change in the fair value of the hedging instruments is recognized in AOCI and reclassified to earnings in the same period when the hedged cash flows impacts earnings. Reclassified gains and losses on interest rate swaps are recorded in the same line item as the interest payments of the hedged long-term borrowings within Interest expense in the Consolidated Statements of Income. As of June 30, 2020, the notional amount of the interest rate swaps that were designated as cash flow hedges was $275.0 million. Considering the interest rates, yield curve and notional amounts as of June 30, 2020, the Company expects to reclassify an estimated $183 thousand of after-tax net gains on derivative instruments designated as cash flow hedges from AOCI into earnings during the next 12 months. The following table presents the pre-tax changes in AOCI from cash flow hedges for the three and six months ended June 30, 2020 and 2019. The after-tax impact of cash flow hedges on AOCI is shown in Note 14 — Accumulated Other Comprehensive Income (Loss) to the Consolidated Financial Statements in the Form-10-Q. ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Gains (losses) recognized in AOCI $ (1,483)   $ —    $ (1,483)   $ —    Gains (losses) reclassified from AOCI to Interest expense $ 377    $ —    $ 377    $ —    Net Investment Hedges — ASC 830-20, Foreign Currency Matters — Foreign Currency Transactions and ASC 815, Derivatives and Hedging, allow hedging of the foreign currency risk of a net investment in a foreign operation. The Company enters into foreign currency forward contracts to hedge a portion of the Bank’s investment in East West Bank (China) Limited, a non-USD functional currency subsidiary in China. The hedging instruments designated as net investment hedges, involve hedging the risk of changes in the USD equivalent value of a designated monetary amount of the Bank’s net investment in East West Bank (China) Limited, against the risk of adverse changes in the foreign currency exchange rate of the Chinese Renminbi (“RMB”). The Company may de-designate the net investment hedges when the Company expects the hedge will cease to be highly effective. The notional and fair value amounts of the foreign exchange forward contracts were $77.7 million and $245 thousand asset, respectively, as of June 30, 2020. In comparison, the notional and fair value amounts of the foreign exchange forward contracts, were $86.2 million and $1.6 million liability, respectively, as of December 31, 2019. The following table presents the after-tax (losses) gains recognized in AOCI on net investment hedges for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Gains (losses) recognized in AOCI $ (377)   $ (598)   $ 627    $ (2,603)   Derivatives Not Designated as Hedging Instruments Interest Rate Contracts — The Company enters into interest rate contracts, which include interest rate swaps and options with its customers to allow customers to hedge against the risk of rising interest rates on their variable rate loans. To economically hedge against the interest rate risks in the products offered to its customers, the Company enters into mirrored offsetting interest rate contracts with third-party financial institutions, including central clearing organizations. Beginning in January 2018, the London Clearing House (“LCH”) amended its rulebook to legally characterize variation margin payments made to and received from LCH as settlements of derivatives, and not as collateral against derivatives. Included in the total notional amount of $8.60 billion of interest rates contracts entered into with financial counterparties as of June 30, 2020, was a notional amount of $2.82 billion of interest rate swaps that cleared through LCH. Applying variation margin payments as settlement to LCH cleared derivative transactions resulted in a reduction in derivative liability fair values of $229.8 million, as of June 30, 2020. In comparison, included in the total notional amount of $7.75 billion of interest rates contracts entered into with financial counterparties as of December 31, 2019, was a notional amount of $2.53 billion of interest rate swaps that cleared through LCH. Applying variation margin payments as settlement to LCH cleared derivative transactions resulted in a reduction in derivative asset fair values of $2.9 million and liability fair values of $75.1 million as of December 31, 2019. The following tables present the notional amounts and the gross fair values of interest rate derivative contracts outstanding as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 Customer Counterparty ($ in thousands) Financial Counterparty Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities Written options $ 858,996    $ —    $ 241    Purchased options $ 858,996    $ 241    $ —    Sold collars and corridors 531,098    10,658    1    Collars and corridors 531,098    1    10,696    Swaps 7,179,331    601,250    —    Swaps 7,211,365    1,330    389,208    Total $ 8,569,425    $ 611,908    $ 242    Total $ 8,601,459    $ 1,572    $ 399,904    ($ in thousands) December 31, 2019 Customer Counterparty ($ in thousands) Financial Counterparty Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities Written options $ 1,003,558    $ —    $ 66    Purchased options $ 1,003,558    $ 67    $ —    Sold collars and corridors 490,852    1,971    16    Collars and corridors 490,852    17    1,996    Swaps 6,247,667    187,294    6,237    Swaps 6,253,205    3,534    115,804    Total $ 7,742,077    $ 189,265    $ 6,319    Total $ 7,747,615    $ 3,618    $ 117,800    Foreign Exchange Contracts — The Company enters into foreign exchange contracts with its customers, consisting of forwards, spot, swap and option contracts to accommodate the business needs of its customers. For the foreign exchange contracts entered into with its customers, the Company managed its foreign exchange exposure by entering into offsetting foreign exchange contracts with third-party financial institutions and/or entering into bilateral collateral and master netting agreements with customer counterparties to manage its credit exposure. The Company also utilizes foreign exchange contracts, which are not designated as hedging instruments to mitigate the economic effect of currency fluctuations on certain foreign currency-denominated on-balance sheet assets and liabilities, primarily for foreign currency-denominated deposits offered to its customers. A majority of the foreign exchange contracts had original maturities of one year or less as of June 30, 2020 and December 31, 2019. The following tables present the notional amounts and the gross fair values of foreign exchange derivative contracts outstanding as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 Customer Counterparty ($ in thousands) Financial Counterparty Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities Forwards and spot $ 1,768,864    $ 17,940    $ 14,246    Forwards and spot $ 62,424    $ 62    $ 98    Swaps 7,160    —    42    Swaps 734,640    4,502    3,808    Collars 1,685    2    —    Collars 162,245    1,538    1,547    Total $ 1,777,709    $ 17,942    $ 14,288    Total $ 959,309    $ 6,102    $ 5,453    ($ in thousands) December 31, 2019 Customer Counterparty ($ in thousands) Financial Counterparty Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities Forwards and spot $ 3,581,036    $ 45,911    $ 40,591    Forwards and spot $ 207,492    $ 1,400    $ 507    Swaps 6,889    16    84    Swaps 702,391    6,156    4,712    Written options 87,036    127    —    Purchased options 87,036    —    127    Collars 2,244    —    14    Collars 165,537    1,027    989    Total $ 3,677,205    $ 46,054    $ 40,689    Total $ 1,162,456    $ 8,583    $ 6,335    Credit Contracts — The Company may periodically enter into RPA contracts to manage the credit exposure on interest rate contracts associated with syndicated loans and may enter into protection sold or protection purchased RPAs with institutional counterparties. Under the RPAs, the Company will receive or make a payment if a borrower defaults on the related interest rate contract. Credit risk on RPAs is managed by monitoring the credit worthiness of the borrowers and institutional counterparties, which is based on the normal credit review process. The referenced entities of the RPAs were investment grade as of both June 30, 2020 and December 31, 2019. The notional amount of the RPAs reflects the Company’s pro-rata share of the derivative instrument. The following table presents the notional amounts and the gross fair values of RPAs sold and purchased outstanding as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 December 31, 2019 Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities RPAs - protection sold $ 193,783    $ —    $ 327    $ 199,964    $ —    $ 84    RPAs - protection purchased 10,714    41    —    10,714    2    —    Total RPAs $ 204,497    $ 41    $ 327    $ 210,678    $ 2    $ 84    Assuming all underlying borrowers referenced in the interest rate contracts defaulted as of June 30, 2020 and December 31, 2019, the exposure from the RPAs with protections sold would be $778 thousand and $125 thousand, respectively. As of June 30, 2020 and December 31, 2019, the weighted-average remaining maturities of the outstanding RPAs were 1.7 years and 2.2 years, respectively. Equity Contracts — As part of the Company’s loan origination process, from time to time, the Company obtains warrants to purchase preferred and/or common stock of technology and life sciences companies to which it provides loans. Warrants grant the Company the right to buy a certain class of the underlying company’s equity at a certain price before expiration. The Company held warrants in three public companies and 17 private companies as of June 30, 2020, and held warrants in three public companies and 18 private companies as of December 31, 2019. The total fair value of the warrants held in both public and private companies was $9.2 million and $1.4 million in assets as of June 30, 2020 and December 31, 2019, respectively. Commodity Contracts — The Company enters into energy commodity contracts in the form of swaps and options with its commercial loan customers to allow them to hedge against the risk of fluctuation in energy commodity prices. To economically hedge against the risk of fluctuation in commodity prices in the products offered to its customers, the Company enters into offsetting commodity contracts with third-party financial institutions to manage the exposure with its customers. Beginning in January 2017, the Chicago Mercantile Exchange (“CME”) amended its rulebook to legally characterize variation margin payments made to and received from CME as settlements of derivatives and not as collateral against derivatives. As of June 30, 2020, the notional quantities that cleared through CME totaled 1,532 thousand barrels of crude oil and 24,895 thousand MMBTUs of natural gas. Applying the variation margin payments as settlement to CME-cleared derivative transactions resulted in reductions in gross derivative asset fair value of $25.0 million and liability fair value of $631 thousand, respectively, as of June 30, 2020, for a net asset fair value of $2.3 million. In comparison, the notional quantities that cleared through CME totaled 1,752 thousand barrels of crude oil and 6,075 thousand MMBTUs of natural gas as of December 31, 2019. Applying the variation margin payments as settlement to CME-cleared derivative transactions resulted in a reduction in gross derivative asset fair value of $2.9 million and liability fair value of $1.5 million, respectively, as of December 31, 2019, for a net asset fair value of $986 thousand. The following tables present the notional amounts and fair values of the commodity derivative positions outstanding as of June 30, 2020 and December 31, 2019: ($ and units in thousands) June 30, 2020 Customer Counterparty ($ and units in thousands) Financial Counterparty Notional Unit Fair Value Notional Unit Fair Value Assets Liabilities Assets Liabilities Crude oil: Crude oil: Written options —    Barrels $ —    $ 70    Purchased options —    Barrels $ 70    $ —    Collars 1,966    Barrels 63    20,463    Collars 2,218    Barrels 21,847    1,607    Swaps 4,189    Barrels 1,273    51,320    Swaps 4,261    Barrels 32,875    1,779    Total 6,155    $ 1,336    $ 71,853    Total 6,479    $ 54,792    $ 3,386    Natural gas: Natural gas: Written options 1,033    MMBTUs $ —    $ 172    Purchased Options 1,023    MMBTUs $ 157    $ —    Collars 13,066    MMBTUs 881    955    Collars 13,186    MMBTUs 883    881    Swaps 70,858    MMBTUs 29,550    31,988    Swaps 78,528    MMBTUs 29,848    29,063    Total 84,957    $ 30,431    $ 33,115    Total 92,737    $ 30,888    $ 29,944    Total $ 31,767    $ 104,968    Total $ 85,680    $ 33,330    ($ and units in thousands) December 31, 2019 Customer Counterparty ($ and units in thousands) Financial Counterparty Notional Unit Fair Value Notional Unit Fair Value Assets Liabilities Assets Liabilities Crude oil: Crude oil: Written options 36    Barrels $ —    $ 30    Purchased options 36    Barrels $ 29    $ —    Collars 3,174    Barrels 2,673    538    Collars 3,630    Barrels 677    2,815    Swaps 4,601    Barrels 6,949    5,531    Swaps 4,721    Barrels 4,516    5,215    Total 7,811    $ 9,622    $ 6,099    Total 8,387    $ 5,222    $ 8,030    Natural gas: Natural gas: Written options 540    MMBTUs $ —    $ 22    Purchased options 530    MMBTUs $ 21    $ —    Collars 14,277    MMBTUs 186    522    Collars 14,517    MMBTUs 471    150    Swaps 48,956    MMBTUs 30,257    35,497    Swaps 48,779    MMBTUs 35,601    30,197    Total 63,773    $ 30,443    $ 36,041    Total 63,826    $ 36,093    $ 30,347    Total $ 40,065    $ 42,140    Total $ 41,315    $ 38,377    The following table presents the net (losses) gains recognized on the Company’s Consolidated Statement of Income related to derivatives not designated as hedging instruments for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Classification on Consolidated Statement of Income Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Derivatives not designated as hedging instruments: Interest rate contracts Interest rate contracts and other derivative income $ (5,361)   $ (1,359)   $ (12,372)   $ (3,138)   Foreign exchange contracts Foreign exchange income 6,201    3,495    9,062    9,821    Credit contracts Interest rate contracts and other derivative income (75)   (36)   (98)   47    Equity contracts Lending fees 8,070    917    8,379    1,167    Commodity contracts Interest rate contracts and other derivative income (71)   (22)   (47)   (18)   Net gains $ 8,764    $ 2,995    $ 4,924    $ 7,879    Credit Risk-Related Contingent Features — Certain over-the-counter derivative contracts of the Company contain early termination provisions that may require the Company to settle any outstanding balances upon the occurrence of a specified credit risk-related event. These events, which are defined by the existing derivative contracts, primarily relate to a downgrade in the credit rating of East West Bank to below investment grade. As of June 30, 2020, the aggregate fair value amounts of all derivative instruments with credit risk-related contingent features that are in a net liability position totaled $136.6 million, in which $136.5 million in cash and securities collateral were posted to cover these positions. As of December 31, 2019, the aggregate fair value amounts of all derivative instruments with credit risk-related contingent features that are in a net liability position totaled $56.4 million, which includes $14.4 million in derivative assets and $70.8 million in derivative liabilities. The Company posted $56.4 million in cash and securities collateral to cover these positions as of December 31, 2019. In the event that the credit rating of East West Bank had been downgraded to below investment grade, additional minimal collateral would have been required to be posted as of June 30, 2020, and December 31, 2019. Offsetting of Derivatives The following tables present the gross derivative fair values, the balance sheet netting adjustments and the resulting net fair values recorded on the consolidated balance sheet, as well as the cash and noncash collateral associated with master netting arrangements. The gross amounts of derivative assets and liabilities are presented after the application of variation margin payments as settlements with centrally cleared organizations, where applicable. The collateral amounts in the following tables are limited to the outstanding balances of the related asset or liability, after the application of netting; therefore instances of overcollateralization are not shown: ($ in thousands) As of June 30, 2020 Gross Amounts Recognized (1) Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Net Amount Master Netting Arrangements Cash Collateral Received (3) Security Collateral Received (5) Derivative assets $ 764,430    $ (110,569)   $ (11,649)   $ 642,212    $ (13,447)   $ 628,765     Gross Amounts Recognized (2) Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Net Amount Master Netting Arrangements Cash Collateral Pledged (4) Security Collateral Pledged (5) Derivative liabilities $ 560,169    $ (110,569)   $ (94,435)   $ 355,165    $ (279,528)   $ 75,637    ($ in thousands) As of December 31, 2019  Gross Amounts Recognized (1) Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Net Amount Master Netting Arrangements Cash Collateral Received (3) Security Collateral Received (5) Derivative assets $ 330,316    $ (121,561)   $ (3,758)   $ 204,997    $ —    $ 204,997     Gross Amounts Recognized (2) Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Net Amount Master Netting Arrangements Cash Collateral Pledged (4) Security Collateral Pledged (5) Derivative liabilities $ 256,528    $ (121,561)   $ (38,238)   $ 96,729    $ (79,619)   $ 17,110    (1)Gross amounts recognized for derivative assets include amounts with counterparties subject to enforceable master netting arrangements or similar agreements of $754.7 million and $328.7 million, respectively, as of June 30, 2020 and December 31, 2019, and amounts with counterparties not subject to enforceable master netting arrangements or similar agreements of $9.7 million and $1.6 million, respectively, as of June 30, 2020 and December 31, 2019. (2)Gross amounts recognized for derivative liabilities include amounts with counterparties subject to enforceable master netting arrangements or similar agreements of $560.0 million and $256.5 million, respectively, as of June 30, 2020 and December 31, 2019, and amounts with counterparties not subject to enforceable master netting arrangements or similar agreements of $211 thousand and $20 thousand, respectively, as of June 30, 2020 and December 31, 2019. (3)Gross cash collateral received under master netting arrangements or similar agreements were $18.1 million and $3.8 million, respectively, as of June 30, 2020 and December 31, 2019. Of the gross cash collateral received, $11.6 million and $3.8 million were used to offset against derivative assets, respectively, as of June 30, 2020 and December 31, 2019. (4)Gross cash collateral pledged under master netting arrangements or similar agreements were $98.9 million and $43.0 million, respectively, as of June 30, 2020 and December 31, 2019. Of the gross cash collateral pledged, $94.4 million and $38.2 million were used to offset against derivative liabilities, respectively, as of June 30, 2020 and December 31, 2019. (5)Represents the fair value of security collateral received and pledged limited to derivative assets and liabilities that are subject to enforceable master netting arrangements or similar agreements. GAAP does not permit the netting of noncash collateral on the consolidated balance sheet but requires disclosure of such amounts. In addition to the amounts included in the tables above, the Company also has balance sheet netting related to the resale and repurchase agreements. Refer to Note 4 — Securities Purchased under Resale Agreements and Sold under Repurchase Agreements to the Consolidated Financial Statements for additional information. Refer to Note 3 — Fair Value Measurement and Fair Value of Financial Instruments to the Consolidated Financial Statements in this Form 10-Q for fair value measurement disclosures on derivatives.

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- References No definition available. + Details Name: us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -URI http://asc.fasb.org/topic&trid=2229140 + Details Name: us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Loans Receivable and Allowance for Credit Losses	6 Months Ended
	Jun. 30, 2020
Loans and Leases Receivable Disclosure [Abstract]
Loans Receivable and Allowance for Credit Losses	Loans Receivable and Allowance for Credit Losses The following table presents the composition of the Company’s loans held-for-investment as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 December 31, 2019 Amortized Cost (1) Non-PCI Loans (1) PCI Loans Total (1) Commercial: C&I $ 13,422,691    $ 12,149,121    $ 1,810    $ 12,150,931    CRE: CRE 10,902,114    10,165,247    113,201    10,278,448    Multifamily residential 3,032,385    2,834,212    22,162    2,856,374    Construction and land 567,716    628,459    40    628,499    Total CRE 14,502,215    13,627,918    135,403    13,763,321    Total commercial 27,924,906    25,777,039    137,213    25,914,252    Consumer: Residential mortgage: Single-family residential 7,660,094    7,028,979    79,611    7,108,590    HELOCs 1,461,951    1,466,736    6,047    1,472,783    Total residential mortgage 9,122,045    8,495,715    85,658    8,581,373    Other consumer 182,461    282,914    —    282,914    Total consumer 9,304,506    8,778,629    85,658    8,864,287    Total loans held-for-investment $ 37,229,412    $ 34,555,668    $ 222,871    $ 34,778,539    Allowance for loan losses (632,071)   (358,287)   —    (358,287)   Loans held-for-investment, net $ 36,597,341    $ 34,197,381    $ 222,871    $ 34,420,252    (1)Includes net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts of $(72.1) million and $(43.2) million as of June 30, 2020 and December 31, 2019, respectively. Loans held-for-investments’ accrued interest receivable was $111.8 million and $121.8 million as of June 30, 2020 and December 31, 2019, respectively. Interest income related to nonaccrual loans of approximately $1.2 million and $1.6 million were reversed during the three and six months ended June 30, 2020, respectively. Interest income of approximately $10 thousand and $12 thousand were recognized on nonaccrual loans for the three and six months ended June 30, 2020, respectively. For the accounting policy on accrued interest receivable related to loans held-for-investment, see Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Form 10-Q. Loans totaling $27.41 billion and $22.43 billion as of June 30, 2020 and December 31, 2019, respectively, were pledged to secure borrowings and provide additional borrowing capacity from the FRB and the FHLB. Credit Quality Indicators All loans are subject to the Company’s credit review and monitoring. For the commercial portfolio, loans are risk rated based on an analysis of the borrower’s current payment performance or delinquency, repayment sources, financial and liquidity factors, including industry and geographic considerations. For the majority of the consumer portfolio, payment performance or delinquency is the driving indicator for the risk ratings. For the Company’s internal credit risk ratings, each individual loan is given a risk rating of 1 through 10. Loans risk rated 1 through 5 are assigned an internal risk rating of “Pass”, with loans risk rated 1 being fully secured by cash or U.S. government securities. Pass loans have sufficient sources of repayment to repay the loan in full, in accordance with all terms and conditions. Loans assigned a risk rating of 6 have potential weaknesses that warrant closer attention by management; these are assigned an internal risk rating of “Special Mention”. Loans assigned a risk rating of 7 or 8 have well-defined weaknesses that may jeopardize the full and timely repayment of the loan; these are assigned an internal risk rating of “Substandard”. Loans assigned a risk rating of 9 have insufficient sources of repayment and a high probability of loss; these are assigned an internal risk rating of “Doubtful”. Loans assigned a risk rating of 10 are uncollectable and of such little value that they are no longer considered bankable assets; these are assigned an internal risk rating of “Loss”. The Company reviews the internal risk ratings for its loan portfolio on a regular and ongoing basis and make adjustments to the risk ratings based on changes in the borrowers’ financial status and the collectability of the loans. The following table summarizes the Company’s loans held-for-investment as of June 30, 2020, presented by loan portfolio segments, internal risk ratings and vintage year. The vintage year is the year of origination, renewal or major modification. ($ in thousands) June 30, 2020 Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Loans Amortized Cost Basis Term Loans Total Amortized Cost Basis by Origination Year 2020 2019 2018 2017 2016 Prior Commercial: C&I: Pass $ 2,922,977    $ 2,010,048    $ 818,374    $ 328,471    $ 85,000    $ 380,727    $ 6,007,247    $ 9,830    $ 12,562,674    Special mention 525    80,449    54,144    22,757    150    6,105    251,461    —    415,591    Substandard 8,102    82,574    52,383    7,979    6,313    2,515    283,335    —    443,201    Doubtful —    —    —    —    964    261    —    —    1,225    Total C&I 2,931,604    2,173,071    924,901    359,207    92,427    389,608    6,542,043    9,830    13,422,691    CRE: Pass 1,249,819    2,859,844    2,410,797    1,380,086    794,228    1,722,081    170,556    10,716    10,598,127    Special mention 13,072    —    49,860    22,468    1,611    45,309    —    —    132,320    Substandard 8,303    51,944    7,711    43,914    17,213    42,582    —    —    171,667    Total CRE 1,271,194    2,911,788    2,468,368    1,446,468    813,052    1,809,972    170,556    10,716    10,902,114    Multifamily residential: Pass 489,855    1,045,053    507,413    414,771    181,265    357,680    5,809    —    3,001,846    Special mention —    20,433    —    —    262    1,228    —    —    21,923    Substandard —    744    2,150    —    —    5,722    —    —    8,616    Total multifamily residential 489,855    1,066,230    509,563    414,771    181,527    364,630    5,809    —    3,032,385    Construction and land: Pass 46,378    283,670    185,570    5,982    21,636    1,170    —    —    544,406    Substandard 3,618    —    —    —    —    19,692    —    —    23,310    Total construction and land 49,996    283,670    185,570    5,982    21,636    20,862    —    —    567,716    Total CRE 1,811,045    4,261,688    3,163,501    1,867,221    1,016,215    2,195,464    176,365    10,716    14,502,215    Total commercial 4,742,649    6,434,759    4,088,402    2,226,428    1,108,642    2,585,072    6,718,408    20,546    27,924,906    Consumer: Single-family residential: Pass 1,150,786    1,987,025    1,694,022    1,162,434    593,501    1,047,965    —    —    7,635,733    Special mention —    637    1,601    836    305    1,834    —    —    5,213    Substandard —    1,393    3,256    3,382    1,349    9,768    —    —    19,148    Total single-family residential mortgage 1,150,786    1,989,055    1,698,879    1,166,652    595,155    1,059,567    —    —    7,660,094    HELOCs: Pass 185    836    4,417    7,949    7,511    18,097    1,239,458    168,658    1,447,111    Special mention —    —    200    —    —    380    2    190    772    Substandard —    151    788    4,632    1,308    4,038    —    3,151    14,068    Total HELOCs 185    987    5,405    12,581    8,819    22,515    1,239,460    171,999    1,461,951    Total residential mortgage 1,150,971    1,990,042    1,704,284    1,179,233    603,974    1,082,082    1,239,460    171,999    9,122,045    Other consumer: Pass 3,236    4,272    3,358    1,838    —    131,825    35,372    —    179,901    Special mention 51    —    —    —    —    —    —    —    51    Substandard 2    —    —    2,491    —    3    13    —    2,509    Total other consumer 3,289    4,272    3,358    4,329    —    131,828    35,385    —    182,461    Total consumer 1,154,260    1,994,314    1,707,642    1,183,562    603,974    1,213,910    1,274,845    171,999    9,304,506    Total $ 5,896,909    $ 8,429,073    $ 5,796,044    $ 3,409,990    $ 1,712,616    $ 3,798,982    $ 7,993,253    $ 192,545    $ 37,229,412    Revolving loans that are converted to term loans presented in the table above are excluded from the term loans by vintage year columns. HELOCS totaling $12.1 million and $43.4 million converted to term loans during the three and six months ended June 30, 2020, respectively. There were no conversions of C&I or CRE revolving loans to term loans during the three and six months ended June 30, 2020. The following tables present the credit risk ratings for non-PCI and PCI loans by portfolio segments as of December 31, 2019: ($ in thousands) December 31, 2019 Pass Special Mention Substandard Doubtful Total Non-PCI Loans Commercial: C&I $ 11,423,094    $ 406,543    $ 302,509    $ 16,975    $ 12,149,121    CRE: CRE 10,003,749    83,683    77,815    —    10,165,247    Multifamily residential 2,806,475    20,406    7,331    —    2,834,212    Construction and land 603,447    —    25,012    —    628,459    Total CRE 13,413,671    104,089    110,158    —    13,627,918    Total commercial 24,836,765    510,632    412,667    16,975    25,777,039    Consumer: Residential mortgage: Single-family residential 7,012,522    2,278    14,179    —    7,028,979    HELOCs 1,453,207    2,787    10,742    —    1,466,736    Total residential mortgage 8,465,729    5,065    24,921    —    8,495,715    Other consumer 280,392    5    2,517    —    282,914    Total consumer 8,746,121    5,070    27,438    —    8,778,629    Total $ 33,582,886    $ 515,702    $ 440,105    $ 16,975    $ 34,555,668    ($ in thousands) December 31, 2019 Pass Special Mention Substandard Doubtful Total PCI Loans Commercial: C&I $ 1,810    $ —    $ —    $ —    $ 1,810    CRE: CRE 102,257    —    10,944    —    113,201    Multifamily residential 22,162    —    —    —    22,162    Construction and land 40    —    —    —    40    Total CRE 124,459    —    10,944    —    135,403    Total commercial 126,269    —    10,944    —    137,213    Consumer: Residential mortgage: Single-family residential 79,517    —    94    —    79,611    HELOCs 5,849    —    198    —    6,047    Total residential mortgage 85,366    —    292    —    85,658    Total consumer 85,366    —    292    —    85,658    Total (1) $ 211,635    $ —    $ 11,236    $ —    $ 222,871    (1)Loans net of ASC 310-10 discount. Nonaccrual and Past Due Loans Loans that are 90 or more days past due are generally placed on nonaccrual status, unless the loan is well-collateralized or guaranteed by government agencies, and in the process of collection. Loans that are less than 90 days past due but have identified deficiencies, such as when the full collection of principal or interest becomes uncertain, are also placed on nonaccrual status. The following table presents the aging analysis of total loans held-for-investment as of June 30, 2020: ($ in thousands) June 30, 2020 Current Accruing Loans Accruing Loans 30-59  Days Past Due Accruing Loans 60-89  Days Past Due Total Accruing Past Due Loans Nonaccrual Loans Less Than 90  Days Past Due Nonaccrual Loans 90 or More Days  Past Due Total Nonaccrual Loans Total Loans Commercial: C&I $ 13,277,732    $ 46,774    $ 13,362    $ 60,136    $ 54,555    $ 30,268    $ 84,823    $ 13,422,691    CRE: CRE 10,836,810    7,452    1,275    8,727    1,210    55,367    56,577    10,902,114    Multifamily residential 3,025,648    3,655    2,308    5,963    774    —    774    3,032,385    Construction and land 567,716    —    —    —    —    —    —    567,716    Total CRE 14,430,174    11,107    3,583    14,690    1,984    55,367    57,351    14,502,215    Total commercial 27,707,906    57,881    16,945    74,826    56,539    85,635    142,174    27,924,906    Consumer: Residential mortgage: Single-family residential 7,619,333    15,739    4,952    20,691    1,713    18,357    20,070    7,660,094    HELOCs 1,444,945    2,165    773    2,938    443    13,625    14,068    1,461,951    Total residential mortgage 9,064,278    17,904    5,725    23,629    2,156    31,982    34,138    9,122,045    Other consumer 165,258    14,636    59    14,695    —    2,508    2,508    182,461    Total consumer 9,229,536    32,540    5,784    38,324    2,156    34,490    36,646    9,304,506    Total $ 36,937,442    $ 90,421    $ 22,729    $ 113,150    $ 58,695    $ 120,125    $ 178,820    $ 37,229,412    The following table presents amortized cost of loans on nonaccrual status for which there was no related allowance for loan losses as of June 30, 2020: ($ in thousands) June 30, 2020 Commercial: C&I $ 66,109    CRE: CRE 54,879    Total CRE 54,879    Total commercial 120,988    Consumer: Residential mortgage: Single-family residential 8,642    HELOCs 8,898    Total residential mortgage 17,540    Other consumer 2,491    Total consumer 20,031    Total nonaccrual loans with no related allowance for loan losses $ 141,019    The following table presents the aging analysis of non-PCI loans as of December 31, 2019: ($ in thousands) December 31, 2019 Current Accruing Loans Accruing Loans 30-59 Days Past Due Accruing Loans 60-89 Days Past Due Total Accruing Past Due Loans Nonaccrual Loans Less Than 90  Days Past Due Nonaccrual Loans 90 or More Days  Past Due Total Nonaccrual Loans Total Non-PCI Loans Commercial: C&I $ 12,026,131    $ 31,121    $ 17,034    $ 48,155    $ 31,084    $ 43,751    $ 74,835    $ 12,149,121    CRE: CRE 10,123,999    22,830    1,977    24,807    540    15,901    16,441    10,165,247    Multifamily residential 2,832,664    198    531    729    534    285    819    2,834,212    Construction and land 628,459    —    —    —    —    —    —    628,459    Total CRE 13,585,122    23,028    2,508    25,536    1,074    16,186    17,260    13,627,918    Total commercial 25,611,253    54,149    19,542    73,691    32,158    59,937    92,095    25,777,039    Consumer: Residential mortgage: Single-family residential 6,993,597    15,443    5,074    20,517    1,964    12,901    14,865    7,028,979    HELOCs 1,448,930    4,273    2,791    7,064    1,448    9,294    10,742    1,466,736    Total residential mortgage 8,442,527    19,716    7,865    27,581    3,412    22,195    25,607    8,495,715    Other consumer 280,386    6    5    11    —    2,517    2,517    282,914    Total consumer 8,722,913    19,722    7,870    27,592    3,412    24,712    28,124    8,778,629    Total $ 34,334,166    $ 73,871    $ 27,412    $ 101,283    $ 35,570    $ 84,649    $ 120,219    $ 34,555,668    PCI loans were excluded from the above aging analysis table as of December 31, 2019, as the Company elected to account for these loans on a pool level basis under ASC 310-30 at the time of acquisition. As of December 31, 2019, PCI loans on nonaccrual status totaled $297 thousand. Foreclosed Assets The Company had $23.4 million in foreclosed assets as of June 30, 2020 compared with $1.3 million as of December 31, 2019. The Company commences the foreclosure process on consumer mortgage loans when a borrower becomes 120 days delinquent in accordance with the Consumer Finance Protection Bureau guidelines. The carrying value of consumer real estate loans that were in the process of active or suspended foreclosure was $6.3 million and $7.2 million as of June 30, 2020 and December 31, 2019, respectively. The foreclosure proceedings for these consumer real estate loans were initiated prior to the CARES Act passed by Congress in March 2020. The Company has suspended certain mortgage foreclosure activities in connection with our actions to support our customers during the COVID-19 pandemic. Troubled Debt Restructurings TDRs are individually evaluated and the type of restructuring is selected based on the loan type and the circumstances of the borrower’s financial difficulty. A TDR is a modification of the terms of a loan when the Company, for economic or legal reasons related to the borrower’s financial difficulties, grants a concession to the borrower that it would not have otherwise considered. The Company has implemented various consumer and commercial loan modification programs to provide its borrowers relief from the economic impacts of COVID-19 that are not considered TDRs. For additional details related to COVID-19 loan modifications, see Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies — Summary of Significant Accounting Policies — Troubled Debt Restructurings to the Consolidated Financial Statements. The following tables present the additions to TDRs for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Loans Modified as TDRs During the Three Months Ended June 30, 2020 2019 Number of Loans Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded    Investment (1) Financial Impact (2) Number of Loans Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded    Investment (1) Financial    Impact (2) Commercial: C&I 3 $ 35,260    $ 28,926    $ 872    6 $ 48,099    $ 48,054    $ 5,869    Total commercial 3 35,260    28,926    872    6 48,099    48,054    5,869    Consumer: Residential mortgage: Single-family residential — —    —    —    1 220    219    —    Total residential mortgage — —    —    —    1 220    219    —    Total consumer — —    —    —    1 220    219    —    Total 3 $ 35,260    $ 28,926    $ 872    7 $ 48,319    $ 48,273    $ 5,869    ($ in thousands) Loans Modified as TDRs During the Six Months Ended June 30, 2020 2019 Number of Loans Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded    Investment (1) Financial    Impact (2) Number of Loans Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded    Investment (1) Financial    Impact (2) Commercial: C&I 6 $ 51,708    $ 43,833    $ 1,000    9 $ 77,250    $ 77,486    $ 5,929    Total commercial 6 51,708    43,833    1,000    9 77,250    77,486    5,929    Consumer: Residential mortgage: Single-family residential — —    —    —    1 220    219    —    Total residential mortgage — —    —    —    1 220    219    —    Total consumer — —    —    —    1 220    219    —    Total 6 $ 51,708    $ 43,833    $ 1,000    10 $ 77,470    $ 77,705    $ 5,929    (1)Includes subsequent payments after modification and reflects the balance as of June 30, 2020 and 2019. (2)The financial impact includes charge-offs and specific reserves recorded since the modification date. The following tables present the TDR post-modification outstanding balances for the three and six months ended June 30, 2020 and 2019 by modification type: ($ in thousands) Modification Type During the Three Months Ended June 30, 2020 2019 Principal (1) Interest Deferments Total Principal (1) Other (2) Total Commercial: C&I $ 11,766    $ 17,160    $ 28,926    $ 9,909    $ 38,145    $ 48,054    Total commercial 11,766    17,160    28,926    9,909    38,145    48,054    Consumer: Residential mortgage: Single-family residential —    —    —    —    219    219    Total residential mortgage —    —    —    —    219    219    Total consumer —    —    —    —    219    219    Total $ 11,766    $ 17,160    $ 28,926    $ 9,909    $ 38,364    $ 48,273    ($ in thousands) Modification Type During the Six Months Ended June 30, 2020 2019 Principal (1) Principal   and Interest (3) Interest Deferments Total Principal (1) Other (2) Total Commercial: C&I $ 15,898    $ 10,775    $ 17,160    $ 43,833    $ 39,341    $ 38,145    $ 77,486    Total commercial 15,898    10,775    17,160    43,833    39,341    38,145    77,486    Consumer: Residential mortgage: Single-family residential —    —    —    —    —    219    219    Total residential mortgage —    —    —    —    —    219    219    Total consumer —    —    —    —    —    219    219    Total $ 15,898    $ 10,775    $ 17,160    $ 43,833    $ 39,341    $ 38,364    $ 77,705    (1)Includes forbearance payments, term extensions and principal deferments that modify the terms of the loan from principal and interest payments to interest payments only. (2)Includes funding to secure additional collateral and provides liquidity to collateral-dependent C&I loans. (3)Includes principal and interest deferments or reductions. Subsequent to restructuring, if a TDR that becomes delinquent, generally beyond 90 days past due, it is considered to be in default. TDRs are individually evaluated for impairment. Subsequent defaults do not generally have a significant additional impact on the allowance for loan losses. The following tables present information on loans for which a subsequent payment default occurred during the three and six months ended June 30, 2020 and 2019, respectively, which had been modified as TDR within the previous 12 months of its default, and were still in default as of June 30, 2020 and 2019: ($ in thousands) Loans Modified as TDRs that Subsequently Defaulted During the Three Months Ended June 30, 2020 2019 Number of Loans Recorded Investment Number of Loans Recorded Investment Commercial: C&I 1    $ 17,160    $ 1    $ 1,484    Total commercial 1    17,160    1    1,484    Total 1    $ 17,160    $ 1    $ 1,484    ($ in thousands) Loans Modified as TDRs that Subsequently Defaulted During the Six Months Ended June 30, 2020 2019 Number of Loans Recorded Investment Number of Loans Recorded Investment Commercial: C&I 1    $ 17,160    $ 1    $ 1,484    Total commercial 1    17,160    1    1,484    Total 1    $ 17,160    $ 1    $ 1,484    The amount of additional funds committed to lend to borrowers whose terms have been modified as TDRs was $4.5 million and $2.2 million as of June 30, 2020 and December 31, 2019, respectively. Impaired Loans In connection with the adoption of ASU 2016-13 on January 1, 2020, the Company no longer provides information on impaired loans. The Company had retained impaired loans information for the period ended December 31, 2019. The following table presents information on non-PCI impaired loans as of December 31, 2019: ($ in thousands) December 31, 2019 Unpaid Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance Commercial: C&I $ 174,656    $ 73,956    $ 40,086    $ 114,042    $ 2,881    CRE: CRE 27,601    20,098    1,520    21,618    97    Multifamily residential 4,965    1,371    3,093    4,464    55    Construction and land 19,696    19,691    —    19,691    —    Total CRE 52,262    41,160    4,613    45,773    152    Total commercial 226,918    115,116    44,699    159,815    3,033    Consumer: Residential mortgage: Single-family residential 23,626    8,507    13,704    22,211    35    HELOCs 13,711    6,125    7,449    13,574    8    Total residential mortgage 37,337    14,632    21,153    35,785    43    Other consumer 2,517    —    2,517    2,517    2,517    Total consumer 39,854    14,632    23,670    38,302    2,560    Total non-PCI impaired loans $ 266,772    $ 129,748    $ 68,369    $ 198,117    $ 5,593    The following table presents the average recorded investment and interest income recognized on non-PCI impaired loans for the three and six months ended June 30, 2019: ($ in thousands) Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Average Recorded Investment Recognized Interest    Income (1) Average Recorded Investment Recognized Interest    Income (1) Commercial: C&I $ 182,689    $ 1,081    $ 189,553    $ 1,816    CRE: CRE 29,241    135    31,456    249    Multifamily residential 5,852    61    5,883    121    Total CRE 35,093    196    37,339    370    Total commercial 217,782    1,277    226,892    2,186    Consumer: Residential mortgage: Single-family residential 23,247    129    24,865    258    HELOCs 13,564    38    15,321    56    Total residential mortgage 36,811    167    40,186    314    Other consumer 2,515    —    2,526    —    Total consumer 39,326    167    42,712    314    Total non-PCI impaired loans $ 257,108    $ 1,444    $ 269,604    $ 2,500    (1)Includes interest income recognized on accruing non-PCI TDRs. Interest payments received on nonaccrual non-PCI loans are reflected as a reduction to principal, not as interest income. Allowance for Loan Losses On January 1, 2020, the Company adopted ASU 2016-13 that establishes a single allowance framework for all financial assets measured at amortized cost and certain off-balance sheet credit exposures. It requires the measurement of the allowance for loan losses to be based on management’s best estimate of lifetime expected credit losses inherent in the Company’s relevant financial assets. Balance sheet information and results for reporting periods beginning with January 1, 2020 are presented under ASC 326, while prior period comparisons continue to be presented under legacy GAAP. The process of the allowance for loan losses involves procedures to consider the unique risk characteristics of the portfolio segments. For each loan portfolio segment, the expected credit losses are estimated collectively for groups of loans with similar risk characteristics. For loans that do not share similar risk characteristics, the expected credit losses are estimated individually, which includes impaired loans. Allowance for Collectively Evaluated Loans Quantitative Component — The allowance for loan losses is estimated using quantitative methods that consider a variety of factors such as historical loss experience, the current credit quality of the portfolio as well as an economic outlook over the life of the loan. The Company incorporates forward-looking information through the use of macroeconomic scenarios applied over the forecasted life of the loans. These macroeconomic scenarios include variables that are considered key drivers of increases and decreases in credit losses. The Company utilizes a probability-weighted multiple scenario forecast approach. These scenarios may consist of a base forecast representing management's view of the most likely outcome, combined with and downside and upside scenarios reflecting possible worsening or improving economic conditions, respectively. A weighted average of these macroeconomic scenarios over a reasonable and supportable forecast period is incorporated into the quantitative models. If the loan’s life extends beyond the reasonable and supportable forecast period, then historical experience is considered over the remaining life of the loans in the allowance for loan losses. Qualitative Component — The Company also considers the following qualitative factors in the determination of collectively evaluated allowance if they have not already been captured by the quantitative model. Such qualitative factors may include, but not limited to: •Loan growth trends. •The volume and severity of past due financial assets and the volume and severity of adversely classified or rated financial assets. •The Company’s lending policies and procedures, including changes in lending strategies, underwriting standards, collection, write-off and recovery practices, as well as knowledge of the borrower’s operations or the borrower’s standing in the community. •The quality of the Company’s credit review system. •The experience, ability and depth of the Company’s management, lending staff and relevant staff. •The effect of other external factors such as the regulatory, legal and technological environments. •Actual and expected changes in international, national, regional, and local economic and business conditions and developments in which the Company operates, including the actual and expected condition of various market segments. The following table provides key credit risk characteristics and macroeconomic variables that the Company uses to estimate the expected credit losses by portfolio segments and methodologies: Portfolio Segment Risk Characteristics Macroeconomic Variables C&I Internal risk rating, size and credit spread at origination and time to maturity Unemployment rate and two and ten year treasury spread CRE, Multifamily residential, and Construction and land Delinquency status, maturity date, collateral value, property type and geographic location Unemployment rate, GDP and U.S. Treasury rates Single-family residential and HELOCs FICO, delinquency status, maturity date, collateral value and geographic location Unemployment rate, GDP and home price index Other consumer Historical loss experience Immaterial (1) (1)Macroeconomic variables were measured in the qualitative estimate. In light of the recessionary economic conditions and forecasts during the quarter, management updated its macroeconomic forecast used in the credit loss estimation process to reflect the sudden sharp and continued recession caused by the COVID-19 global pandemic, U.S. monetary and fiscal responses to the outbreak, oil price declines and other assumptions. The macroeconomic forecast used in the credit loss estimation for the quarter ended June 30, 2020 was more adverse compared to the prior quarter, as expectations for the unemployment rate and real GDP growth deteriorated and a slower recovery was expected. For the three and six months ended June 30, 2020, there were no changes to the reasonable and supportable forecast period, and reversion to historical loss experience method. Allowance for Loan Losses for the Commercial Loan Portfolio — The Company’s C&I lifetime loss rate model estimates credit losses by estimating a loss rate expected over the life of a loan. This loss rate is applied to the amortized cost basis, excluding accrued interest receivables, to determine expected credit losses. The lifetime loss rate model’s reasonable and supportable period spans eight quarters, thereafter immediately reverting to the historical average loss rate, expressed implicitly through the loan-level lifetime loss rate. The Company’s CRE probability of default (“PD”)/loss given default (“LGD”) models estimate the probability that a loan will default and, in the event of default, estimate the expected credit losses upon default. The product of the PD/LGD determines the Company’s CECL. The PD/LGD model assumptions and variable inputs span the entire contractual life of the loans, adjusted for expected prepayments. After a reasonable and supportable period, the forecast of future economic conditions reverts to long-run historical economic trends. The loan-specific variables apply over the lifetime of a loan. In order to estimate the life of a loan under both models, the contractual term of the loan is adjusted for estimated prepayments, which are based on historical prepayment experience. Allowance for Loan Losses for the Consumer Loan Portfolio — For single-family residential and HELOC loans, PD/LGD model assumptions and variable inputs span the entire contractual life of the loans, adjusted for expected prepayments. After a reasonable and supportable period, the forecast of future economic conditions reverts to long-run historical economic trends. The loan-specific variables apply over the lifetime of a loan. For other consumer loans, the Company uses a loss rate approach. In order to estimate the life of a loan, the contractual term of the loan is adjusted for estimated prepayments, which are based on historical prepayment experience. While the Company’s allowance methodologies strive to reflect all relevant credit risk factors, there continues to be uncertainty associated with, but not limited to, potential imprecision in the estimation process due to the inherent time lag of obtaining information and normal variations between expected and actual outcomes. The Company may hold additional reserves that are designed to provide coverage for losses attributable to such risk. The allowance for loan losses as of June 30, 2020 also included qualitative adjustments for certain industry sectors, such as oil & gas, which are included as part of the C&I loan portfolio, that the Company views as higher risk, where quantitative models may not have captured the additional exposure related to such industry sectors. Allowance for Individually Assessed Loans When a loan no longer shares similar risk characteristics with other loans, such as in the case for certain nonaccrual or TDR loans, the Company estimates the allowance for loan losses on an individual loan basis. The allowance for loan losses for individually evaluated loans is measured as the difference between the recorded value of the loans and their fair value. For loans evaluated individually, the Company uses one of three different asset valuation measurement methods: (1) the present value of expected future cash flows; (2) the fair value of collateral less costs to sell; and (3) the loan's observable market price. If an individually evaluated loan is determined to be collateral dependent, the Company applies the fair value of the collateral less costs to sell method. If an individually evaluated loan is determined to not be collateral dependent, the Company uses the present value of future cash flows or the observable market value of the loan. Collateral-Dependent Loans — When a loan is collateral dependent, the allowance is measured on an individual loan basis and is limited to the difference between the recorded value and fair value of the collateral less cost of disposal or sale. As of June 30, 2020, collateral-dependent commercial and consumer loans totaled $88.1 million and $23.8 million, respectively. The Company's commercial collateral-dependent loans were secured by real estate or other collateral. The Company's consumer collateral-dependent loans were all residential mortgage loans, secured by the underlying real estate. As of June 30, 2020, the collateral value of the properties securing each of these collateral dependent loans, net of selling costs, exceeded the recorded value of the individual loans, except for two loans, one C&I loan and one HELOC loan, against which there was a recorded allowance of $756 thousand and $76 thousand, respectively. For the three and six months ended June 30, 2020, there was no significant deterioration or changes in the collateral securing these loans. The following tables present summaries of activities in the allowance for loan losses by portfolio segment for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, 2020 Commercial Consumer Total C&I CRE Residential Mortgage Other Consumer CRE Multi-Family Residential Construction and Land Single- Family Residential HELOCs Allowance for loan losses, beginning of period $ 362,629    $ 132,819    $ 16,530    $ 11,018    $ 26,822    $ 3,881    $ 3,304    $ 557,003    Provision for (reversal of) credit losses on loans (a) 37,862    43,315    7,908    7,526    (1,667)   205    (849)   94,300    Gross charge-offs (20,378)   (320)   —    —    —    (221)   (30)   (20,949)   Gross recoveries 602    226    620    7    159    2    93    1,709    Total net (charge-offs) recoveries (19,776)   (94)   620    7    159    (219)   63    (19,240)   Foreign currency translation adjustments 8    —    —    —    —    —    —    8    Allowance for loan losses, end of period $ 380,723    $ 176,040    $ 25,058    $ 18,551    $ 25,314    $ 3,867    $ 2,518    $ 632,071    ($ in thousands) Three Months Ended June 30, 2019 Commercial Consumer Total C&I CRE Residential Mortgage Other Consumer CRE Multi-Family Residential Construction and Land Single- Family Residential HELOCs Allowance for loan losses, beginning of period $ 189,757    $ 39,224    $ 19,169    $ 22,349    $ 35,759    $ 7,401    $ 4,235    $ 317,894    Provision for (reversal of) credit losses on loans (a) 26,140    (1,250)   58    173    (3,068)   (1,224)   (98)   20,731    Gross charge-offs (11,745)   —    —    —    —    —    (14)   (11,759)   Gross recoveries 1,713    1,837    53    439    72    —    7    4,121    Total net (charge-offs) recoveries (10,032)   1,837    53    439    72    —    (7)   (7,638)   Foreign currency translation adjustments (362)   —    —    —    —    —    —    (362)   Allowance for loan losses, end of period $ 205,503    $ 39,811    $ 19,280    $ 22,961    $ 32,763    $ 6,177    $ 4,130    $ 330,625    ($ in thousands) Six Months Ended June 30, 2020 Commercial Consumer Total C&I CRE Residential Mortgage Other Consumer CRE Multi-Family Residential Construction and Land Single- Family Residential HELOCs Allowance for loan losses, beginning of period $ 238,376    $ 40,509    $ 22,826    $ 19,404    $ 28,527    $ 5,265    $ 3,380    $ 358,287    Impact of ASU 2016-13 adoption 74,237    72,169    (8,112)   (9,889)   (3,670)   (1,798)   2,221    125,158    Allowance for loan losses, January 1, 2020 312,613    112,678    14,714    9,515    24,857    3,467    5,601    483,445    Provision for (reversal of) credit losses on loans (a) 98,480    54,750    9,189    9,008    33    617    (3,121)   168,956    Gross charge-offs (32,355)   (1,274)   —    —    —    (221)   (56)   (33,906)   Gross recoveries 2,177    9,886    1,155    28    424    4    94    13,768    Total net (charge-offs) recoveries (30,178)   8,612    1,155    28    424    (217)   38    (20,138)   Foreign currency translation adjustments (192)   —    —    —    —    —    —    (192)   Allowance for loan losses, end of period $ 380,723    $ 176,040    $ 25,058    $ 18,551    $ 25,314    $ 3,867    $ 2,518    $ 632,071    ($ in thousands) Six Months Ended June 30, 2019 Commercial Consumer Total C&I CRE Residential Mortgage Other Consumer CRE Multi-Family Residential Construction and Land Single- Family Residential HELOCs Allowance for loan losses, beginning of period $ 189,117    $ 40,666    $ 19,885    $ 20,290    $ 31,340    $ 5,774    $ 4,250    $ 311,322    Provision for (reversal of) credit losses on loans (a) 41,404    (2,914)   (939)   2,169    1,349    401    (99)   41,371    Gross charge-offs (28,989)   —    —    —    —    —    (28)   (29,017)   Gross recoveries 3,964    2,059    334    502    74    2    7    6,942    Total net (charge-offs) recoveries (25,025)   2,059    334    502    74    2    (21)   (22,075)   Foreign currency translation adjustments 7    —    —    —    —    —    —    7    Allowance for loan losses, end of period $ 205,503    $ 39,811    $ 19,280    $ 22,961    $ 32,763    $ 6,177    $ 4,130    $ 330,625    The following table presents a summary of activities in the allowance for unfunded credit commitments for the three and six months ended June 30, 2020 and 2019: Three Months Ended June 30, Six Months Ended June 30, ($ in thousands) 2020 2019 2020 2019 Unfunded credit facilities Allowance for unfunded credit commitments, beginning of period $ 20,829    $ 14,505    $ 11,158    $ 12,566    Impact of ASU 2016-13 adoption —    —    10,457    —    Provision for (reversal of) credit losses on unfunded credit  commitments (b) 8,143    (1,486)   7,357    453    Allowance for unfunded credit commitments, end of period $ 28,972    $ 13,019    $ 28,972    $ 13,019    Provision for credit losses (a) + (b) $ 102,443    $ 19,245    $ 176,313    $ 41,824    The allowance for loan losses as of June 30, 2020 was $632.1 million, an increase of $273.8 million compared with $358.3 million as of December 31, 2019. The overall increase in allowance for loan losses was primarily driven by deteriorating macroeconomic conditions and outlook as a result of the COVID-19 pandemic, which resulted in a provision for credit losses of $102.4 million and $176.3 million for the three and six months ended June 30, 2020, respectively, and the adoption of ASU 2016-13, which increased the allowance for loan losses by $125.2 million on January 1, 2020. The allowance for unfunded credit commitments is maintained at a level that management believes to be sufficient to absorb estimated expected credit losses related to unfunded credit facilities. See Note 10 — Commitments and Contingencies to the Consolidated Financial Statements in this Form 10-Q for additional information related to unfunded credit commitments. The following table presents the Company’s allowance for loan losses and recorded investments by portfolio segments and impairment methodology as of December 31, 2019. This is no longer relevant after December 31, 2019, given the adoption of ASU 2016-13 on January 1, 2020, which has a single impairment methodology: ($ in thousands) December 31, 2019 Commercial Consumer Total C&I CRE Residential Mortgage Other Consumer CRE Multifamily Residential Construction and Land Single- Family Residential HELOCs Allowance for loan losses Individually evaluated for impairment $ 2,881    $ 97    $ 55    $ —    $ 35    $ 8    $ 2,517    $ 5,593    Collectively evaluated for impairment 235,495    40,412    22,771    19,404    28,492    5,257    863    352,694    Acquired with deteriorated credit quality —    —    —    —    —    —    —    —    Total $ 238,376    $ 40,509    $ 22,826    $ 19,404    $ 28,527    $ 5,265    $ 3,380    $ 358,287    Recorded investment in loans Individually evaluated for impairment $ 114,042    $ 21,618    $ 4,464    $ 19,691    $ 22,211    $ 13,574    $ 2,517    $ 198,117    Collectively evaluated for impairment 12,035,079    10,143,629    2,829,748    608,768    7,006,768    1,453,162    280,397    34,357,551    Acquired with deteriorated credit quality (1) 1,810    113,201    22,162    40    79,611    6,047    —    222,871    Total (1) $ 12,150,931    $ 10,278,448    $ 2,856,374    $ 628,499    $ 7,108,590    $ 1,472,783    $ 282,914    $ 34,778,539    (1)Loans net of ASC 310-10 discount. Purchased Credit-Deteriorated Loans On January 1, 2020, the amortized cost basis of the PCD loans was adjusted to reflect the $1.2 million of allowance for loan losses. For the three and six months ended June 30, 2020, the Company did not acquire any PCD loans. For information on PCD loans, see Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Form 10-Q.  The following table presents the changes in accretable yield on PCI loans for the three and six months ended June 30, 2019: ($ in thousands) Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Accretable yield for PCI loans, beginning of period $ 68,861    $ 74,870    Accretion (5,806)   (12,007)   Changes in expected cash flows 998    1,190    Accretable yield for PCI loans, end of period $ 64,053    $ 64,053    Loans Held-for-Sale As of June 30, 2020 and December 31, 2019, loans held-for-sale of $3.9 million and $434 thousand, respectively, consisted of single-family residential loans. Refer to Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Loans Held-for-Sale to the Consolidated Financial Statements of the Company’s 2019 Form 10-K for additional details related to the Company’s loans held-for-sale. Loan Purchases, Transfers and Sales The Company purchases and sells loans in the secondary market in the ordinary course of business. From time to time, purchased loans may be transferred from held-for-investment to held-for-sale, and write-downs to allowance for loan losses are recorded, when appropriate. The following tables provide information about the carrying value of loans purchased for the held-for-investment portfolio, loans sold and loans transferred from held-for-investment to held-for-sale at lower of cost or fair value during the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, 2020 Commercial Consumer Total C&I CRE Residential Mortgage CRE Multifamily Residential Construction and Land Single-Family Residential Loans transferred from held-for-investment to held-for-sale (1) $ 33,060    $ —    $ —    $ —    $ —    $ 33,060    Sales (2)(3)(4) $ 33,060    $ —    $ —    $ —    $ 13,708    $ 46,768    Purchases (5) $ 12,503    $ —    $ 7    $ —    $ —    $ 12,510    ($ in thousands) Three Months Ended June 30, 2019 Commercial Consumer Total C&I CRE Residential Mortgage CRE Multifamily Residential Construction and Land Single-Family Residential Loans transferred from held-for-investment to held-for-sale (1) $ 79,593    $ —    $ —    $ 1,573    $ —    $ 81,166    Sales (2)(3)(4) $ 76,031    $ —    $ —    $ 1,573    $ 1,172    $ 78,776    Purchases (5) $ 159,100    $ —    $ 1,734    $ —    $ 17,637    $ 178,471    ($ in thousands) Six Months Ended June 30, 2020 Commercial Consumer Total C&I CRE Residential Mortgage CRE Multifamily Residential Construction and Land Single-Family Residential Loans transferred from held-for-investment to held-for-sale (1) $ 136,033    $ 7,250    $ —    $ —    $ —    $ 143,283    Sales (2)(3)(4) $ 136,033    $ 7,250    $ —    $ —    $ 18,350    $ 161,633    Purchases (5) $ 143,086    $ —    $ 1,520    $ —    $ 1,084    $ 145,690    ($ in thousands) Six Months Ended June 30, 2019 Commercial Consumer Total C&I CRE Residential Mortgage CRE Multifamily Residential Construction and Land Single-Family Residential Loans transferred from held-for-investment to held-for-sale (1) $ 155,166    $ 16,655    $ —    $ 1,573    $ —    $ 173,394    Sales (2)(3)(4) $ 151,677    $ 16,655    $ —    $ 1,573    $ 3,614    $ 173,519    Purchases (5) $ 266,294    $ —    $ 5,952    $ —    $ 54,039    $ 326,285    (1)The Company recorded no write-downs to the allowance for loan losses related to loans transferred from held-for-investment to held-for-sale for both the three and six months ended June 30, 2020 and $317 thousand and $390 thousand for the same periods in 2019, respectively. (2)Includes originated loans sold of $46.8 million and $161.6 million for the three and six months ended June 30, 2020, respectively, and $55.7 million and $132.2 million for the same periods in 2019, respectively. Originated loans sold were primarily C&I and single-family residential loans during the three and six months ended June 30, 2020. In comparison, originated loans sold were primarily C&I loans for the same periods in 2019. (3)Includes none of the purchased loans sold in the secondary market for both the three and six months ended June 30, 2020 and $23.1 million and $41.3 million for the same periods in 2019, respectively. (4)Net gains on sales of loans were $132 thousand and $1.1 million for the three and six months ended June 30, 2020, respectively, and $15 thousand and $930 thousand for the same periods in 2019, respectively. (5)C&I loan purchases for each of the three and six months ended June 30, 2020 and 2019 were comprised primarily of syndicated C&I term loans.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details Name: us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities	6 Months Ended
	Jun. 30, 2020
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities [Abstract]
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities	Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities The Community Reinvestment Act (“CRA”) encourages banks to meet the credit needs of their communities for housing and other purposes, particularly in low- and moderate-income neighborhoods. The Company invests in certain affordable housing projects in the form of ownership interests in limited partnerships or limited liability companies that qualify for CRA and tax credits. These entities are formed to develop and operate apartment complexes designed as high-quality affordable housing for lower income tenants throughout the U.S. To fully utilize the available tax credits, each of these entities must meet the regulatory affordable housing requirements for a minimum 15-year compliance period. In addition to affordable housing projects, the Company also invests in New Market Tax Credit projects that qualify for CRA credits, as well as eligible projects that qualify for renewable energy and historic tax credits. Investments in renewable energy tax credits help promote the development of renewable energy sources, and the investments in historic tax credits promote the rehabilitation of historic buildings and economic revitalization of the surrounding areas. Investments in Qualified Affordable Housing Partnerships, Net The Company records its investments in qualified affordable housing partnerships, net, using the proportional amortization method. Under the proportional amortization method, the Company amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received, and recognizes the amortization in Income tax expense on the Consolidated Statement of Income. The following table presents the Company’s investments in qualified affordable housing partnerships, net, and related unfunded commitments as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 December 31, 2019 Investments in qualified affordable housing partnerships, net $ 201,888    $ 207,037    Accrued expenses and other liabilities — Unfunded commitments $ 72,655    $ 80,294    The following table presents additional information related to the Company’s investments in qualified affordable housing partnerships, net, for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Tax credits and other tax benefits recognized $ 11,772    $ 11,506    $ 22,803    $ 23,332    Amortization expense included in income tax expense $ 9,148    $ 9,657    $ 17,532    $ 18,554    Investments in Tax Credit and Other Investments, Net Depending on the ownership percentage and the influence the Company has on the investments in tax credit and other investments, net, the Company applies the equity or cost method of accounting, or the measurement alternative as elected under ASU 2016-01 for equity investments without readily determinable fair value. The following table presents the Company’s investments in tax credit and other investments, net, and related unfunded commitments as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 December 31, 2019 Investments in tax credit and other investments, net $ 251,318    $ 254,140    Accrued expenses and other liabilities — Unfunded commitments $ 106,969    $ 113,515    Amortization of tax credit and other investments was $24.8 million and $42.1 million, respectively, for the three and six months ended June 30, 2020, as compared with $16.7 million and $41.6 million, respectively, for the same periods in 2019. Included in Investments in tax credit and other investments, net, on the Consolidated Balance Sheet were equity securities with readily determinable fair values of $31.1 million and $31.7 million, as of June 30, 2020 and December 31, 2019, respectively. These equity securities were CRA investments measured at fair value with changes in fair value recorded in net income. The Company recorded unrealized gains on these equity securities of $720 thousand and $758 thousand during the three and six months ended June 30, 2020, respectively, and unrealized gains of $375 thousand and $767 thousand, respectively, for the same periods in 2019. The Company held equity securities without readily determinable fair values at carrying value totaling $18.8 million and $19.1 million as of June 30, 2020 and December 31, 2019, respectively, which were measured using the measurement alternative at cost less impairment and adjusted for observable price changes. For the three and six months ended June 30, 2020 and 2019, there were no adjustments to these securities. The Company recorded an impairment recovery of $109 thousand related to one historic tax credit investment and impairment recoveries of $259 thousand related to two historic tax credit investments for the three and six months ended June 30, 2020, respectively. During the second quarter of 2020, the Company also recorded $733 thousand OTTI charge related to one historic tax credit and one CRA investment. In comparison, the Company recorded an OTTI charge of $2.9 million and $9.9 million, respectively, and no impairment recovery for the three and six months ended June 30, 2019. OTTI charges and impairment recoveries are recorded within Amortization of tax credit and other investments on the Consolidated Statement of Income for the three and six months ended June 30, 2020 and 2019. Variable Interest Entities The Company invests in unconsolidated limited partnerships and similar entities that construct, own and operate affordable housing, historic rehabilitation projects, wind and solar projects, of which the majority of such investments are Variable interest entities (“VIEs”). As a limited partner in these partnerships, these investments are designed to generate a return primarily through the realization of federal tax credits and tax benefits. An unrelated third party is typically the general partner or managing member who has control over the significant activities of such investments. While the Company’s interest in some of the investments may exceed 50% of the outstanding equity interests, the Company does not consolidate these structures due to the general partner or managing member’s ability to manage the entity, which is indicative of power over them. The Company’s maximum exposure to loss in connection with these partnerships consist of the unamortized investment balance and any tax credits claimed that may become subject to recapture. Special purpose entities formed in connection with securitization transactions are generally considered VIEs. The Company is the servicer of the multifamily residential loans it has securitized in 2016. The Company does not consolidate the multifamily securitization entity because it does not have power and does not have a variable interest that could potentially be significant to the VIE. A CLO is a VIE that purchases a pool of assets consisting primarily of non-investment grade corporate loans and issues multiple tranches of notes to investors to fund the asset purchases and pay upfront expenses associated with forming the CLO. The Company serves as the collateral manager of a CLO that closed in the fourth quarter of 2019 and retained substantially all of the investment grade rated securities issued by the CLO. In accordance with GAAP, the Company does not consolidate the CLO as it does not hold interests that could potentially be significant to the CLO. The Company’s maximum exposure to loss from the CLO is equal to the carrying amount of the retained securities of $274.0 million and $284.7 million as of June 30, 2020 and December 31, 2019, respectively.

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- Definition The entire disclosure for affordable housing partnerships, tax credit, other investments, net and variable interest entities. + References No definition available. + Details Name: ewbc_AffordableHousingPartnershipsandTaxCreditandOtherInvestmentsNetandVariableInterestEntitiesTextBlock Namespace Prefix: ewbc_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Investments in Qualified Affordable Housing Partnerships, Net [Abstract] + References No definition available. + Details Name: ewbc_InvestmentsInQualifiedAffordableHousingPartnershipsTaxCreditAndOtherInvestmentsNetAndVariableInterestEntitiesAbstract Namespace Prefix: ewbc_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.20.2

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill Total goodwill was $465.7 million as of both June 30, 2020 and December 31, 2019. Goodwill represents the excess of the purchase price over the fair value of net assets acquired in an acquisition. The Company assesses goodwill for impairment at the reporting unit level, equivalent to the same level as the Company’s business segments. This assessment is performed on an annual basis as of December 31 each year, or more frequently if events or circumstances, such as adverse changes in the economic or business environment, indicate there may be impairment. The Company organizes its operation into three reporting segments: (1) Consumer and Business Banking; (2) Commercial Banking; and (3) Other. For information on how the reporting units are identified and the components are aggregated, see Note 15 — Business Segments to the Consolidated Financial Statements in this Form 10-Q. There was no change in the carrying amount of goodwill during the three and six months ended June 30, 2020. The following table presents changes in the carrying amount of goodwill by reporting unit during the six months ended June 30, 2019: ($ in thousands) Consumer and Business Banking Commercial Banking Total Beginning balance, January 1, 2019 $ 353,321    $ 112,226    $ 465,547    Acquisition of East West Capital Markets, LLC —    150    150    Ending balance, June 30, 2019 $ 353,321    $ 112,376    $ 465,697    Impairment Analysis The Company performed its annual impairment analysis as of December 31, 2019, and concluded that there was no goodwill impairment as the fair value of all reporting units exceeded the carrying amount of their respective reporting unit. Given the economic and market deterioration as a result of the COVID-19 outbreak and public health response to contain it, the Company further evaluated goodwill by assessing if the fair value of all reporting units exceeded the carrying amount of the respective reporting units by performing a goodwill impairment analysis as of March 31, 2020 and concluded that no impairment was warranted. While there is uncertainty in the duration of the COVID-19 impact and the reopening of the economy, the Company did not note further stressed macroeconomic conditions, adverse market conditions, deterioration of the Company’s financial performance, any other significant events, that negatively impacted the fair value of its reporting units during the three months ended June 30, 2020. Based on this, the Company concluded that there was no goodwill impairment as of June 30, 2020. Refer to Note 9 — Goodwill and Other Intangible Assets to the Consolidated Financial Statements of the Company’s 2019 Form 10-K for additional details related to the Company’s annual goodwill impairment analysis. Core Deposit Intangibles Core deposit intangibles represent the intangible value of depositor relationships resulting from deposit liabilities assumed in various acquisitions and are included in Other assets on the Consolidated Balance Sheet. These intangibles are tested for impairment on an annual basis, or more frequently as events occur or current circumstances and conditions warrant. There were no impairment write-downs on the core deposit intangibles for each of the three and six months ended June 30, 2020 and 2019. The following table presents the gross carrying amount of core deposit intangible assets and accumulated amortization as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 December 31, 2019 Gross balance (1) $ 86,099    $ 86,099    Accumulated amortization (1) (77,972)   (76,088)   Net carrying balance (1) $ 8,127    $ 10,011    (1)Excludes fully amortized core deposit intangible assets. Amortization Expense The Company amortizes the core deposit intangibles based on the projected useful lives of the related deposits. The amortization expense related to the core deposit intangible assets was $931 thousand and $1.1 million for the three months ended June 30, 2020 and 2019, respectively, and $1.9 million and $2.3 million for the six months ended June 30, 2020 and 2019, respectively. The following table presents the estimated future amortization expense of core deposit intangibles as of June 30, 2020: ($ in thousands) Amount Remainder of 2020 $ 1,750    2021 2,749    2022 1,865    2023 1,199    2024 553    Thereafter 11    Total $ 8,127

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- References No definition available. + Details Name: us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details Name: us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments to Extend Credit — In the normal course of business, the Company provides customers loan commitments on predetermined terms. These outstanding commitments to extend credit are not reflected in the accompanying Consolidated Financial Statements. While the Company does not anticipate losses as a result of these transactions, commitments to extend credit are included in determining the appropriate level of the allowance for unfunded credit commitments, and outstanding commercial and SBLCs. The following table presents the Company’s credit-related commitments as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 December 31, 2019 Loan commitments $ 5,131,120    $ 5,330,211    Commercial letters of credit and SBLCs $ 2,005,402    $ 1,860,414    Loan commitments are agreements to lend to customers provided that there are no violations of any conditions established in the agreement. Commitments generally have fixed expiration dates or other termination clauses and may require maintenance of compensatory balances. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future funding requirements. Commercial letters of credit are issued to facilitate domestic and foreign trade transactions, while SBLCs are generally contingent upon the failure of the customers to perform according to the terms of the underlying contract with the third party. As a result, the total contractual amounts do not necessarily represent future funding requirements. The Company’s historical experience is that SBLCs typically expire without being funded. Additionally, in many cases, the Company holds collateral in various forms against these SBLCs. As part of its risk management activities, the Company monitors the creditworthiness of customers in conjunction with its SBLC exposure. Customers are obligated to reimburse the Company for any payment made on the customers’ behalf. If the customers fail to pay, the Company would, as applicable, liquidate the collateral and/or offset accounts. As of June 30, 2020, total letters of credit of $2.01 billion consisted of SBLCs of $1.93 billion and commercial letters of credit of $72.3 million. The Company applies the same credit underwriting criteria to extend loans, commitments and conditional obligations to customers. Each customer’s creditworthiness is evaluated on a case-by-case basis. Collateral and financial guarantees may be obtained based on management’s assessment of a customer’s credit. Collateral may include cash, accounts receivable, inventory, property, plant and equipment, and income-producing commercial property. Estimated exposure to loss from these commitments is included in the allowance for unfunded credit commitments and amounted to $28.9 million as of June 30, 2020 and $11.1 million as of December 31, 2019. Guarantees — The Company sells or securitizes single-family and multifamily residential loans with recourse in the ordinary course of business. The recourse component of the loans sold or securitized with recourse is considered a guarantee. As the guarantor, the Company is obligated to repurchase up to the recourse component of the loans if the loans default. The following table presents the types of guarantees the Company had outstanding as of June 30, 2020 and December 31, 2019: ($ in thousands) Maximum Potential Future Payments Carrying Value June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Single-family residential loans sold or securitized with recourse $ 11,501    $ 12,578    $ 11,501    $ 12,578    Multifamily residential loans sold or securitized with recourse 15,682    15,892    30,152    40,708    Total $ 27,183    $ 28,470    $ 41,653    $ 53,286    The Company’s recourse reserve related to these guarantees is included in the allowance for unfunded credit commitments and totaled $85 thousand and $76 thousand as of June 30, 2020 and December 31, 2019, respectively. The allowance for unfunded credit commitments is included in Accrued expenses and other liabilities on the Consolidated Balance Sheet. The Company continues to experience minimal losses from the single-family and multifamily residential loan portfolios sold or securitized with recourse. Litigation — The Company is a party to various legal actions arising in the course of its business. In accordance with ASC 450, Contingencies, the Company accrues reserves for outstanding lawsuits, claims and proceedings when a loss contingency is probable and can be reasonably estimated. The Company estimates the amount of loss contingencies using current available information from legal proceedings, advice from legal counsel and available insurance coverage. Due to the inherent subjectivity of the assessments and unpredictability of the outcomes of the legal proceedings, any amounts accrued or included in this aggregate amount may not represent the ultimate loss to the Company from the legal proceedings in question. Thus, the Company’s exposure and ultimate losses may be higher, and possibly significantly more than the amounts accrued. Other Commitments — The Company has commitments to invest in qualified affordable housing partnerships, tax credit and other investments as discussed in Note 8 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities to the Consolidated Financial Statements in this Form 10-Q. As of June 30, 2020 and December 31, 2019, these commitments were $179.6 million and $193.8 million, respectively. These commitments are included in Accrued expenses and other liabilities on the Consolidated Balance Sheet.

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- Definition The entire disclosure for commitments and contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -URI http://asc.fasb.org/topic&trid=2127136 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -URI http://asc.fasb.org/topic&trid=2144648 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308 + Details Name: us-gaap_CommitmentsAndContingenciesDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers The following tables present revenue from contracts with customers within the scope of ASC 606, Revenue from Contracts with Customers, and other noninterest income, segregated by operating segments for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, 2020 Consumer and Business Banking Commercial Banking Other Total Noninterest income: Revenue from contracts with customers: Deposit account fees: Deposit service charges and related fee income $ 6,166    $ 3,904    $ 41    $ 10,111    Card income 639    122    —    761    Wealth management fees 2,691    400    —    3,091    Total revenue from contracts with customers $ 9,496    $ 4,426    $ 41    $ 13,963    Other sources of noninterest income (1) 4,447    29,461    10,766    44,674    Total noninterest income $ 13,943    $ 33,887    $ 10,807    $ 58,637    ($ in thousands) Three Months Ended June 30, 2019 Consumer and Business Banking Commercial Banking Other Total Noninterest income: Revenue from contracts with customers: Deposit account fees: Deposit service charges and related fee income $ 5,397    $ 3,299    $ 10    $ 8,706    Card income 747    154    —    901    Wealth management fees 3,565    235    —    3,800    Total revenue from contracts with customers $ 9,709    $ 3,688    $ 10    $ 13,407    Other sources of noninterest income (1) 4,794    29,968    4,590    39,352    Total noninterest income $ 14,503    $ 33,656    $ 4,600    $ 52,759    ($ in thousands) Six Months Ended June 30, 2020 Consumer and Business Banking Commercial Banking Other Total Noninterest income: Revenue from contracts with customers: Deposit account fees: Deposit service charges and related fee income $ 11,710    $ 7,703    $ 47    $ 19,460    Card income 1,537    322    —    1,859    Wealth management fees 7,704    740    —    8,444    Total revenue from contracts with customers $ 20,951    $ 8,765    $ 47    $ 29,763    Other sources of noninterest income (1) 9,394    57,578    15,951    82,923    Total noninterest income $ 30,345    $ 66,343    $ 15,998    $ 112,686    ($ in thousands) Six Months Ended June 30, 2019 Consumer and Business Banking Commercial Banking Other Total Noninterest income: Revenue from contracts with customers: Deposit account fees: Deposit service charges and related fee income $ 10,630    $ 6,573    $ 26    $ 17,229    Card income 1,507    339    —    1,846    Wealth management fees 7,233    341    —    7,574    Total revenue from contracts with customers $ 19,370    $ 7,253    $ 26    $ 26,649    Other sources of noninterest income (1) 8,905    50,947    8,389    68,241    Total noninterest income $ 28,275    $ 58,200    $ 8,415    $ 94,890    (1)Primarily represents revenue from contracts with customers that are out of the scope of ASC 606, Revenue from Contracts with Customers. Generally, the Company recognizes revenue from contracts with customers when it satisfies its performance obligations. The Company’s performance obligations are typically satisfied as services are rendered. The Company generally records contract liabilities, or deferred revenue, when payments from customers are received or due in advance of providing services. The Company records contract assets when services are provided to customers before payment is received or before payment is due. Since the Company receives payments for its services during the period or at the time services are provided, there were no contract assets or contract liabilities as of both June 30, 2020 and December 31, 2019. The major revenue streams by fee type that are within the scope of ASC 606 presented in the above tables are described in additional detail below: Deposit Account Fees — Deposit Service Charges and Related Fee Income The Company offers a range of deposit products to individuals and businesses, which includes savings, money market, checking and time deposit accounts. The deposit account services include ongoing account maintenance, as well as certain optional services such as automated teller machine usage, wire transfer services or check orders. In addition, treasury management and business account analysis services are offered to commercial deposit customers. The monthly account fees may vary with the amount of average monthly deposit balances maintained, or the Company may charge a fixed monthly account maintenance fee if certain average balances are not maintained. In addition, each time a deposit customer selects an optional service, the Company may earn transactional fees, generally recognized by the Company at the point when the transaction occurs. For business analysis accounts, commercial deposit customers receive an earnings credit based on their account balance, which can be used to offset the cost of banking and treasury management services. Business analysis accounts that are assessed fees in excess of earnings credits received are typically charged at the end of each month, after all transactions are known and the credits are calculated. Deposit Account Fees — Card Income Card income is comprised of merchant referral fees and interchange income. For merchant referral fees, the Company provides marketing and referral services to acquiring banks for merchant card processing services and earns variable referral fees based on transaction activities. The Company satisfies its performance obligation over time as the Company identifies, solicits, and refers business customers who are provided such services. The Company receives monthly fees net of consideration it pays to the acquiring bank performing the merchant card processing services. The Company recognizes revenue on a monthly basis when the uncertainty associated with the variable referral fees is resolved after the Company receives monthly statements from the acquiring bank. For interchange income, the Company, as a card issuer, has a stand ready performance obligation to authorize, clear, and settle card transactions. The Company earns, or pays, interchange fees, which are percentage-based on each transaction, and based on rates published by the corresponding payment network for transactions processed using their network. The Company measures its progress toward the satisfaction of its performance obligation over time, as services are rendered, and the Company provides continuous access to this service and settles transactions as its customer or the payment network requires. Interchange income is presented net of direct costs paid to the customer and entities in their distribution chain, which are transaction-based expenses such as rewards program expenses and certain network costs. Revenue is recognized when the net profit is determined by the payment networks at the end of each day. Wealth Management Fees The Company provides investment planning services for customers including wealth management services, asset allocation strategies, portfolio analysis and monitoring, investment strategies, and risk management strategies. The fees the Company earns are variable and are generally received monthly. The Company recognizes revenue for the services performed at quarter-end based on actual transaction details received from the broker-dealer the Company engages. Practical Expedients and Exemptions The Company applies the practical expedient in ASC 606-10-50-14 and does not disclose the value of unsatisfied performance obligations as the Company’s contracts with customers generally have a term that is less than one year, are open-ended with a cancellation period that is less than one year, or allow the Company to recognize revenue in the amount to which the Company has the right to invoice. In addition, given the short-term nature of the contracts, the Company also applies the practical expedient in ASC 606-10-32-18 and does not adjust the consideration from customers for the effects of a significant financing component, if at contract inception, the period between when the entity transfers the goods or services and when the customer pays for that good or service is one year or less.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details Name: us-gaap_RevenueFromContractWithCustomerTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Stock Compensation Plans	6 Months Ended
	Jun. 30, 2020
Share-based Payment Arrangement [Abstract]
Stock Compensation Plans	Stock Compensation Plans Pursuant to the Company’s 2016 Stock Incentive Plan, as amended, the Company may issue stocks, stock options, restricted stock, restricted stock units (“RSUs”), stock purchase warrants, stock appreciation rights, phantom stock and dividend equivalents to eligible employees, non-employee directors, consultants, and other service providers of the Company and its subsidiaries. There were no outstanding stock awards other than RSUs as of both June 30, 2020 and December 31, 2019. The following table presents a summary of the total share-based compensation expense and the related net tax (deficiencies) benefits associated with the Company’s various employee share-based compensation plans for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Stock compensation costs $ 7,071    $ 8,081    $ 14,280    $ 15,525    Related net tax (deficiencies) benefits for stock compensation plans $ (9)   $ 1    $ (1,575)   $ 4,708    Restricted Stock Units — RSUs are granted under the Company’s long-term incentive plan at no cost to the recipient. RSUs cliff vest after three years of continued employment from the date of the grant and are authorized to settle predominantly in shares of the Company’s common stock. Certain RSUs will be settled in cash. RSUs entitle the recipient to receive cash dividend equivalents to any dividends paid on the underlying common stock during the period RSUs are outstanding. The dividends are accrued during the vesting period and are paid at the time of vesting. While a portion of RSUs are time-vesting awards, others vest subject to the attainment of specified performance goals referred to as “performance-based RSUs.” Substantially all RSUs are subject to forfeiture until vested unless otherwise specified in the employment terms. Performance-based RSUs are granted at the target amount of awards. Based on the Company’s attainment of specified performance goals and consideration of market conditions, the number of shares that vest can be adjusted to a minimum of 0% and to a maximum of 200% of the target. The amount of performance-based RSUs that are eligible to vest is determined at the end of each performance period and is then added together as the total number of performance shares to vest. Performance-based RSUs cliff vest three years from the date of each grant. Compensation costs for the time-based awards that will be settled in shares of the Company’s common stock are based on the quoted market price of the Company’s common stock at the grant date. Compensation costs for certain time-based awards that will be settled in cash are adjusted to fair value based on changes in the share price of the Company’s common stock up to the settlement date. Compensation costs associated with performance-based RSUs are based on grant date fair value which considers both market and performance conditions, and is subject to subsequent adjustments based on the changes in the Company’s projected outcome of the performance criteria. Compensation costs of both time-based and performance-based awards are estimated based on awards ultimately expected to vest and recognized on a straight-line basis from the grant date until the vesting date of each grant. The following table presents a summary of the activities for the Company’s time-based and performance-based RSUs that will be settled in shares for the six months ended June 30, 2020. The number of outstanding performance-based RSUs stated below assumes the associated performance targets will be met at the target level: Time-Based RSUs Performance-Based RSUs Shares Weighted-Average Grant Date Fair Value Shares Weighted-Average Grant Date Fair Value Outstanding, January 1, 2020 1,139,868    $ 57.78    386,483    $ 60.13    Granted 657,461    40.51    165,084    39.79    Vested (251,526)   54.47    (131,597)   56.59    Forfeited (100,371)   54.33    —    —    Outstanding, June 30, 2020 1,445,432    $ 50.74    419,970    $ 53.24    The following table presents a summary of the activities for the Company’s time-based RSUs that will be settled in cash for the six months ended June 30, 2020: Shares Outstanding, January 1, 2020 11,638    Granted 11,215    Vested (723)   Forfeited —    Outstanding, June 30, 2020 22,130    As of June 30, 2020, there were $31.4 million and $19.6 million of total unrecognized compensation costs related to unvested time-based and performance-based RSUs, respectively. These costs are expected to be recognized over a weighted-average period of 2.04 years and 2.07 years, respectively.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details Name: us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- References No definition available. + Details Name: us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.20.2

Stockholders' Equity and Earnings Per Share	6 Months Ended
	Jun. 30, 2020
Stockholders' Equity and Earnings Per Share [Abstract]
Stockholders' Equity and Earnings Per Share	Stockholders’ Equity and Earnings Per Share The following table presents the basic and diluted EPS calculations for the three and six months ended June 30, 2020 and 2019. For more information on the calculation of EPS, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Earnings Per Share to the Consolidated Financial Statements of the Company’s 2019 Form 10-K. ($ and shares in thousands, except per share data) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Basic: Net income $ 99,352    $ 150,380    $ 244,176    $ 314,404    Basic weighted-average number of shares outstanding 141,486    145,546    143,150    145,402    Basic EPS $ 0.70    $ 1.03    $ 1.71    $ 2.16    Diluted: Net income $ 99,352    $ 150,380    $ 244,176    $ 314,404    Basic weighted-average number of shares outstanding (1) 141,486    145,546    143,150    145,402    Diluted potential common shares (2) 341    506    410    614    Diluted weighted-average number of shares outstanding (1)(2) 141,827    146,052    143,560    146,016    Diluted EPS $ 0.70    $ 1.03    $ 1.70    $ 2.15    (1)The Company acquired MetroCorp Bancshares, Inc. (“MetroCorp”) on January 17, 2014. Prior to the acquisition, MetroCorp had outstanding warrants to purchase 771,429 shares of its common stock. Upon the acquisition, the rights of the warrant holders were converted into the rights to acquire 230,282 shares of East West’s common stock until January 16, 2019. All warrants were exercised on January 7, 2019. (2)Includes dilutive shares from RSUs for the three and six months ended June 30, 2020 and 2019. For the three and six months ended June 30, 2020, 1.2 million and 620 thousand weighted-average shares of anti-dilutive RSUs, respectively, were excluded from the diluted EPS computation. In comparison, 584 thousand and 239 thousand weighted-average shares of anti-dilutive RSUs, respectively, were excluded from the diluted EPS computation for the three and six months ended June 30, 2019. Stock Repurchase Program — On March 3, 2020, the Company’s Board of Directors authorized a stock repurchase program to buy back up to $500.0 million of the Company’s common stock. For the three months ended June 30, 2020, there were no share repurchases. For the six months ended June 30, 2020, the Company repurchased 4,471,682 shares at an average price of $32.64 per share and a total cost of $146.0 million. The Company did not repurchase any shares during the three and six months ended June 30, 2019.

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- Definition Stockholders' Equity and Earnings Per Share [Abstract] + References No definition available. + Details Name: ewbc_StockholdersEquityandEarningsPerShareAbstract Namespace Prefix: ewbc_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details Name: us-gaap_EarningsPerShareTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The following tables present the changes in the components of AOCI balances for the three and six months ended June 30, 2020 and 2019: ($ in thousands) AFS Debt Securities Cash Flow Hedges Foreign Currency Translation Adjustments (1) Total Balance, April 1, 2019 $ (23,810)   $ —    $ (9,173)   $ (32,983)   Net unrealized gains (losses) arising during the period 30,046    —    (6,016)   24,030    Amounts reclassified from AOCI (1,019)   —    —    (1,019)   Changes, net of tax 29,027    —    (6,016)   23,011    Balance, June 30, 2019 $ 5,217    $ —    $ (15,189)   $ (9,972)   Balance, April 1, 2020 $ 25,034    $ —    $ (18,153)   $ 6,881    Net unrealized gains (losses) arising during the period 24,606    (1,063)   (230)   23,313    Amounts reclassified from AOCI (6,790)   (270)   —    (7,060)   Changes, net of tax 17,816    (1,333)   (230)   16,253    Balance, June 30, 2020 $ 42,850    $ (1,333)   $ (18,383)   $ 23,134    ($ in thousands) AFS Debt Securities Cash Flow Hedges Foreign Currency Translation Adjustments (1) Total Balance, January 1, 2019 $ (45,821)   $ —    $ (12,353)   $ (58,174)   Net unrealized gains (losses) arising during the period 53,157    —    (2,836)   50,321    Amounts reclassified from AOCI (2,119)   —    —    (2,119)   Changes, net of tax 51,038    —    (2,836)   48,202    Balance, June 30, 2019 $ 5,217    $ —    $ (15,189)   $ (9,972)   Balance, January 1, 2020 $ (2,419)   $ —    $ (15,989)   $ (18,408)   Net unrealized gains (losses) arising during the period 53,136    (1,063)   (2,394)   49,679    Amounts reclassified from AOCI (7,867)   (270)   —    (8,137)   Changes, net of tax 45,269    (1,333)   (2,394)   41,542    Balance, June 30, 2020 $ 42,850    $ (1,333)   $ (18,383)   $ 23,134    (1)Represents foreign currency translation adjustments related to the Company’s net investment in non-U.S. operations, including related hedges. The functional currency and reporting currency of the Company’s foreign subsidiary was RMB and USD, respectively. The following tables present the components of other comprehensive income (loss), reclassifications to net income and the related tax effects for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, 2020 2019 Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax AFS debt securities: Net unrealized gains arising during the period $ 34,970    $ (10,364)   $ 24,606    $ 44,531    $ (14,485)   $ 30,046    Net realized (gains) reclassified into net income (1) (9,640)   2,850    (6,790)   (1,447)   428    (1,019)   Net change 25,330    (7,514)   17,816    43,084    (14,057)   29,027    Cash flow hedges Net unrealized (losses) arising during the period (1,483)   420    (1,063)   —    —    —    Net realized (gains) reclassified into net income (2) (377)   107    (270)   —    —    —    Net change (1,860)   527    (1,333)   —    —    —    Foreign currency translation adjustments, net of hedges: Net unrealized (losses) arising during the period (379)   149    (230)   (2,989)   (3,027)   (6,016)   Net change (379)   149    (230)   (2,989)   (3,027)   (6,016)   Other comprehensive income (loss) $ 23,091    $ (6,838)   $ 16,253    $ 40,095    $ (17,084)   $ 23,011    ($ in thousands) Six Months Ended June 30, 2020 2019 Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax AFS debt securities: Net unrealized gains arising during the period $ 75,463    $ (22,327)   $ 53,136    $ 75,469    $ (22,312)   $ 53,157    Net realized (gains) reclassified into net income (1) (11,169)   3,302    (7,867)   (3,008)   889    (2,119)   Net change 64,294    (19,025)   45,269    72,461    (21,423)   51,038    Cash flow hedges Net unrealized (losses) arising during the period (1,483)   420    (1,063)   —    —    —    Net realized (gains) reclassified into net income (2) (377)   107    (270)   —    —    —    Net change (1,860)   527    (1,333)   —    —    —    Foreign currency translation adjustments, net of hedges: Net unrealized (losses) arising during the period (2,145)   (249)   (2,394)   191    (3,027)   (2,836)   Net change (2,145)   (249)   (2,394)   191    (3,027)   (2,836)   Other comprehensive income (loss) $ 60,289    $ (18,747)   $ 41,542    $ 72,652    $ (24,450)   $ 48,202    (1)For the three and six months ended June 30, 2020 and 2019, pre-tax amounts were reported in Gains on sales of AFS debt securities on the Consolidated Statement of Income. (2)For the three and six months ended June 30, 2020 and 2019, pre-tax amounts were reported in Interest expense on the Consolidated Statement of Income.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details Name: us-gaap_ComprehensiveIncomeNoteTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- References No definition available. + Details Name: us-gaap_EquityAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.20.2

Business Segments	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Business Segments	Business Segments The Company organizes its operations into three reportable operating segments: (1) Consumer and Business Banking; (2) Commercial Banking; and (3) Other. These segments are defined by the type of customers served, and the related products and services provided. The segments reflect how financial information is currently evaluated by management. Operating segment results are based on the Company’s internal management reporting process, which reflects assignments and allocations of certain balance sheet and income statement items. The information presented is not indicative of how the segments would perform if they operated as independent entities due to the interrelationships among the segments. The Consumer and Business Banking segment primarily provides financial products and services to consumer and commercial customers through the Company’s domestic branch network. This segment offers consumer and commercial deposits, mortgage and home equity loans, and other products and services. It also originates commercial loans for small and medium-sized enterprises through the Company’s branch network. Other products and services provided by this segment include wealth management, treasury management and foreign exchange services. The Commercial Banking segment primarily generates commercial loans and deposits. Commercial loan products include commercial business loans and lines of credit, trade finance loans and letters of credit, CRE loans, construction and land loans, affordable housing loans and letters of credit, asset-based lending, and equipment financing. Commercial deposit products and other financial services include treasury management, foreign exchange services, and interest rate and commodity risk hedging. The remaining centralized functions, including the corporate treasury activities of the Company and eliminations of inter-segment amounts, have been aggregated and included in the Other segment, which provides broad administrative support to the two core segments, namely the Consumer and Business Banking and the Commercial Banking segments. The Company utilizes an internal reporting process to measure the performance of the three operating segments within the Company. The internal reporting process derives operating segment results by utilizing allocation methodologies for revenue and expenses. Net interest income of each segment represents the difference between actual interest earned on assets and interest incurred on liabilities of the segment, adjusted for funding charges or credits through the Company’s internal funds transfer pricing (“FTP”) process. Noninterest income and noninterest expense directly attributable to a business segment are assigned to that segment. Indirect costs, including technology-related costs and corporate overhead, are allocated based on a segment’s estimated usage using factors including but not limited to, full-time equivalent employees, net interest income, and loan and deposit volume. Charge-offs are allocated to the segment directly associated with the loans charged off, and the remaining provision for credit losses is allocated to each segment based on loan volume. The Company’s internal reporting process utilizes a full-allocation methodology. Under this methodology, corporate and indirect expenses incurred by the Other segment are allocated to the Consumer and Business Banking and the Commercial Banking segments, except certain corporate treasury-related expenses and insignificant unallocated expenses. The corporate treasury function within the Other segment is responsible for liquidity and interest rate management of the Company. The Company’s internal FTP process is also managed by the corporate treasury function within the Other segment. The process is formulated with the goal of encouraging loan and deposit growth that is consistent with the Company’s overall profitability objectives, as well as to provide a reasonable and consistent basis for the measurement of its business segments’ net interest margins and profitability. The FTP process charges a cost to fund loans (“FTP charges for loans”) and allocates credits for funds provided from deposits (“FTP credits for deposits”) using internal FTP rates. FTP charges for loans are determined based on a matched cost of funds, which is tied to the pricing and term characteristics of the loans. FTP credits for deposits are based on matched funding credit rates, which are tied to the implied or stated maturity of the deposits. FTP credits for deposits reflect the long-term value generated by the deposits. The net spread between the total internal FTP charges and credits is recorded as part of net interest income in the Other segment. The FTP process transfers the corporate interest rate risk exposure to the treasury function within the Other segment, where such exposures are centrally managed. The Company’s internal FTP assumptions and methodologies are reviewed at least annually to ensure that the process is reflective of current market conditions. During the third quarter of 2019, the Company enhanced its FTP methodology related to deposits by setting a minimum floor rate using the short-term FHLB rate as a reference rate for the FTP credits paid for deposits in event of the flattened and inverted yield curve. This methodology has been retrospectively applied to segment financial results for the three and six months ended June 30, 2019, and the process is effectively reflecting the current market conditions as of June 30, 2020. The following tables present the operating results and other key financial measures for the individual operating segments as of and for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Consumer and Business Banking Commercial Banking Other Total Three Months Ended June 30, 2020 Net interest income before provision for credit losses $ 124,926    $ 183,796    $ 35,053    $ 343,775    Provision for credit losses 5,590    96,853    —    102,443    Noninterest income 13,943    33,887    10,807    58,637    Noninterest expense 80,164    64,900    42,632    187,696    Segment income before income taxes 53,115    55,930    3,228    112,273    Segment net income $ 38,058    $ 40,178    $ 21,116    $ 99,352    As of June 30, 2020 Segment assets $ 12,666,938    $ 26,984,013    $ 9,756,642    $ 49,407,593    ($ in thousands) Consumer and Business Banking Commercial Banking Other Total Three Months Ended June 30, 2019 Net interest income before provision for credit losses $ 180,911    $ 158,941    $ 27,474    $ 367,326    Provision for credit losses 1,616    17,629    —    19,245    Noninterest income 14,503    33,656    4,600    52,759    Noninterest expense 83,656    67,303    26,704    177,663    Segment income before income taxes 110,142    107,665    5,370    223,177    Segment net income (loss) $ 78,741    $ 76,885    $ (5,246)   $ 150,380    As of June 30, 2019 Segment assets $ 11,013,898    $ 25,001,894    $ 6,876,566    $ 42,892,358    ($ in thousands) Consumer and Business Banking Commercial Banking Other Total Six Months Ended June 30, 2020 Net interest income before provision for credit losses $ 277,517    $ 367,297    $ 61,668    $ 706,482    Provision for credit losses 13,378    162,935    —    176,313    Noninterest income 30,345    66,343    15,998    112,686    Noninterest expense 167,128    135,026    64,418    366,572    Segment income before income taxes 127,356    135,679    13,248    276,283    Segment net income $ 91,253    $ 97,309    $ 55,614    $ 244,176    As of June 30, 2020 Segment assets $ 12,666,938    $ 26,984,013    $ 9,756,642    $ 49,407,593    ($ in thousands) Consumer and Business Banking Commercial Banking Other Total Six Months Ended June 30, 2019 Net interest income before provision for credit losses $ 365,970    $ 311,649    $ 52,168    $ 729,787    Provision for credit losses 4,629    37,195    —    41,824    Noninterest income 28,275    58,200    8,415    94,890    Noninterest expense 171,562    137,847    55,176    364,585    Segment income before income taxes 218,054    194,807    5,407    418,268    Segment net income $ 155,887    $ 139,219    $ 19,298    $ 314,404    As of June 30, 2019 Segment assets $ 11,013,898    $ 25,001,894    $ 6,876,566    $ 42,892,358

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8657-108599 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details Name: us-gaap_SegmentReportingDisclosureTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Subsequent Events	6 Months Ended
	Jun. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsOn July 23, 2020, the Company’s Board of Directors declared third quarter 2020 cash dividends for the Company’s common stock. The common stock cash dividend of $0.275 per share is payable on August 17, 2020 to stockholders of record as of August 4, 2020.

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- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -URI http://asc.fasb.org/topic&trid=2122774 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 855 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662 + Details Name: us-gaap_SubsequentEventsTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation	East West Bancorp, Inc. (referred to herein on an unconsolidated basis as “East West” and on a consolidated basis as the “Company”) is a registered bank holding company that offers a full range of banking services to individuals and businesses through its subsidiary bank, East West Bank and its subsidiaries (“East West Bank” or the “Bank”). The unaudited interim Consolidated Financial Statements in this Form 10-Q include the accounts of East West, East West Bank and East West’s subsidiaries. Intercompany transactions and accounts have been eliminated in consolidation. As of June 30, 2020, East West also has six wholly-owned subsidiaries that are statutory business trusts (the “Trusts”). In accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 810, Consolidation, the Trusts are not included on the Consolidated Financial Statements.
Basis of Presentation	The unaudited interim Consolidated Financial Statements are presented in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”), applicable guidelines prescribed by regulatory authorities, and general practices in the banking industry. They reflect all adjustments that, in the opinion of management, are necessary for fair statement of the interim Consolidated Financial Statements. Certain items on the Consolidated Financial Statements and notes for the prior periods have been reclassified to conform to the current period presentation.
New Accounting Pronouncements Adopted and Recent Accounting Pronouncements	New Accounting Pronouncements Adopted Standard Required Date of Adoption Description Effect on Financial Statements Standards Adopted in 2020 ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments and subsequent related ASUs January 1, 2020 Early adoption is permitted on January 1, 2019. The ASU introduces a new current expected credit loss (“CECL”) model that applies to most financial assets measured at amortized cost and certain instruments, including trade and other receivables, loan receivables, AFS and held-to-maturity debt securities, net investments in leases and off-balance sheet credit exposures. The CECL model utilizes a lifetime “expected credit loss” measurement objective for the recognition of credit losses at the time the financial asset is originated or acquired. The expected credit losses are adjusted in each period for changes in expected lifetime credit losses. ASU 2016-13 also eliminates the guidance for purchased credit impaired (“PCI”) loans, but requires an allowance for loan losses for purchased financial assets with more than an insignificant deterioration of credit since origination. The ASU also modifies the other-than-temporary impairment (“OTTI”) model for AFS debt securities to require an allowance for credit losses instead of a direct write-down. A reversal of the allowance for credit losses is allowed in future periods based on improvements in credit performance expectations. This ASU expands the disclosure requirements regarding an entity’s assumptions, models and methods for estimating the allowance for loan and lease losses, and requires disclosure of the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination (i.e., by vintage year). The guidance should be applied using a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption. The new guidance also allows optional relief for certain instruments measured at amortized cost with an option to irrevocably elect the fair value option under ASC Topic 825, Financial Instruments. The Company adopted ASU 2016-13 using a modified retrospective approach on January 1, 2020 without electing the fair value option on eligible financial instruments under ASU 2019-05. The adoption of this ASU increased the allowance for loan losses by $125.2 million, and allowance for unfunded credit commitments by $10.5 million and an after-tax decrease to opening retained earnings of $98.0 million on January 1, 2020. The increase to allowance for loan losses was primarily related to the commercial and industrial (“C&I”) and commercial real estate (“CRE”) loan portfolios. The Company did not record an allowance for credit losses related to the Company’s AFS debt securities as a result of this adoption. Disclosures for periods after January 1, 2020 are presented in accordance with ASC 326 while prior period amounts continue to be reported in accordance with previously applicable standards and the accounting policies described in the Company’s 2019 Form 10-K. The Company has elected the CECL phase-in option provided by regulatory capital rules, which delays the impact of CECL on regulatory capital for two years, followed by a three-year transition period. ASU 2017-04, Intangibles — Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment January 1, 2020 Early adoption is permitted for interim or annual goodwill impairment tests with measurement dates after January 1, 2017. The ASU simplifies the accounting for goodwill impairment. Under this guidance, an entity will no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, an impairment loss will be recognized when the carrying amount of a reporting unit exceeds its fair value and the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The guidance also eliminates the requirement to perform a qualitative assessment for any reporting units with a zero or negative carrying amount. This guidance should be applied prospectively. The Company adopted this guidance on January 1, 2020. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements. ASU 2018-15, Intangibles — Goodwill and Other — Internal-Use Software (Subtopic 350-40) Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract January 1, 2020 The ASU amends ASC Topic 350-40 to align the accounting for costs incurred in a cloud computing arrangement with the guidance on developing internal use software. Specifically, if a cloud computing arrangement is deemed to be a service contract, certain implementation costs are eligible for capitalization. The new guidance prescribes the balance sheet and income statement presentation and cash flow classification for the capitalized costs and related amortization expense. The amendments in this ASU should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company adopted this guidance on a prospective basis on January 1, 2020. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements. Recent Accounting Pronouncement Standard Required Date of Adoption Description Effect on Financial Statements Standard Not Yet Adopted ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting Effective for all entities as of March 12, 2020 through December 31, 2022. In March 2020, the FASB issued a new accounting standard related to contracts or hedging relationships that reference London interbank offered rate or other reference rates that are expected to be discontinued due to reference rate reform. This ASU provides temporary optional expedients and exceptions regarding the accounting requirements related to the modification of certain contracts, hedging relationships and other transactions that are affected by the reference rate reform. The guidance permits the Company to make a one-time election to sell and/or transfer qualifying held-to-maturity securities, and not to apply modification accounting or remeasure lease payments in lease contracts if the changes to the contract are related to the discontinuation of the reference rate. If certain criteria are met, the amendments also allow exceptions to the de-designation criteria of the hedging relationship and the assessment of hedge effectiveness during the transition period. This one time election may be made at any time after March 12, 2020, but no later than December 31, 2022. The Company has not yet made a determination on whether it will make this election and is currently tracking the exposure as of each reporting period and assessing the significance of impact towards implementing any necessary modification in consideration of the election of this amendment. The Company will continue to assess the impact as the reference rate transition occurs over the next two years. Summary of Significant Accounting Policies The Company has revised the following significant accounting policies. Allowance for Loan Losses — The allowance for loan losses is established as management’s estimate of expected credit losses inherent in the Company’s lending activities and increased by the provision for credit losses and decreased by net charge-offs. Subsequent recoveries, if any, are credited to the allowance for loan losses. The allowance for loan losses is evaluated quarterly by management based on regular reviews of the collectability of the loans. The Company develops and documents the allowance for loan losses methodology at the portfolio segment level — the commercial loan portfolio is comprised of C&I, CRE, multifamily residential, and construction and land loans; and the consumer loan portfolio is comprised of single-family residential, home equity lines of credit (“HELOC”), and other consumer loans. The allowance for loan losses represents the portion of the loan’s amortized cost basis that the Company does not expect to collect due to anticipated credit losses over the loan’s contractual life. The Company measures the expected loan losses on a collective pool basis when similar risk characteristics exist. Models consisting of quantitative and qualitative components are designed for each pool to develop the expected credit loss estimates. Reasonable and supportable forecast periods vary by loan portfolio. The collectively evaluated loans include non-classified and classified loans that have not been determined to be impaired. The Company has adopted lifetime loss rate models for the portfolios, which use historical loss rates and forecast economic variables to calculate the expected credit losses for each loan pool. When impaired loans do not share similar risk characteristics, the Company evaluates the loan for expected credit losses on an individual basis. Impaired loans include nonaccrual and troubled debt restructuring (“TDR”) loans. The Company considers loans to be impaired if, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the original contractual terms of the loan agreement. For loans determined to be impaired, three different asset valuation measurement methods are available: (1) the present value of expected future cash flows, (2) the fair value of collateral less costs to sell, and (3) the loan's observable market price. The allowance for loan losses for collateral-dependent loans is determined based on the fair value of the collateral less costs to sell. For loans that are not collateral-dependent, the Company applies the present value of expected future cash flows valuation or the market value of the loan. When the loan is deemed uncollectible, the Company’s policy is to promptly charge off the estimated impaired amount. The amortized cost of loans held-for-investment excludes accrued interest, which is included in Other assets on the Consolidated Balance Sheet. The Company has made an accounting policy election to not recognize an allowance for credit losses for accrued interest receivables as the Company reverses accrued interest if a loan is on nonaccrual status. The allowance for loan losses is reported separately on the Consolidated Balance Sheet and the Provision for credit losses is reported on the Consolidated Statement of Income. Allowance for Unfunded Credit Commitments — The allowance for unfunded credit commitments includes reserves provided for unfunded loan commitments, letters of credit, standby letters of credit (“SBLCs”) and recourse obligations for loans sold. The Company estimates the allowance for unfunded credit commitments over the contractual period in which the entity is exposed to credit risk via a present contractual obligation to extend credit. Within the period of credit exposure, the estimate of credit losses will consider both the likelihood that funding will occur, and an estimate of the expected credit losses on the commitments that are expected to fund over their estimated lives. The allowance for unfunded credit commitments is maintained at a level believed by management to be sufficient to absorb estimated expected credit losses related to unfunded credit facilities. The determination of the adequacy of the allowance is based on periodic evaluations of the unfunded credit facilities. For all off-balance sheet instruments and commitments, the unfunded credit exposure is calculated using utilization assumptions based on the Company's historical utilization experience in related portfolio segments. Loss rates are applied to the calculated exposure balances to estimate the allowance for unfunded credit commitments. Other elements such as credit risk factors for loans outstanding, terms and expiration dates of the unfunded credit facilities, and other pertinent information are considered to determine the adequacy of the allowance. The allowance for unfunded credit commitments is included in Accrued expenses and other liabilities on the Consolidated Balance Sheet. Changes to the allowance for unfunded credit commitments are included in Provision for credit losses on the Consolidated Income Statements. Allowance for Credit Losses on Available-for-Sale Debt Securities — ASU 2016-13 modifies the OTTI model for AFS debt securities to apply an allowance approach for credit impairment as opposed to permanently writing down the cost basis of the security. For each reporting period, AFS debt securities that are in an unrealized loss position are individually analyzed as part of the Company’s ongoing assessments to determine whether a fair value below the amortized cost basis has resulted from a credit loss or other factors. The initial indicator of impairment is a decline in fair value below the amortized cost, excluding accrued interest, of the AFS debt security. The Company first considers whether there is a plan to sell the AFS debt security or it is more-likely-than-not that it will be required to sell the debt security before recovery of the amortized cost. In determining whether an impairment is due to credit related factors, the Company considers the severity of the decline in fair value, nature of the security, the underlying collateral, the financial condition of the issuer, changes in the AFS debt securities’ ratings and other qualitative factors. For securities that are fully guaranteed by the U.S. government, or certain government enterprises, the Company believes that the credit loss exposure on these securities is remote and applies a zero credit loss assumption. When the Company does not intend to sell the impaired AFS debt security and it is more-likely-than-not that the Company will not be required to sell the impaired debt security prior to recovery of its amortized cost basis, the credit component of the unrealized loss of the impaired AFS debt security is recognized as an allowance for credit losses, with a corresponding Provision for credit losses on the Consolidated Statement of Income and the non-credit component is recognized in Other comprehensive income (loss) on the Consolidated Statement of Comprehensive Income, net of applicable taxes. At each reporting period, the Company increases or decreases the allowance for credit losses as appropriate, while limiting reversals of the allowance for credit losses to the extent of the amounts previously recorded. If the Company intends to sell the impaired debt security or it is more-likely-than-not that the Company will be required to sell the impaired debt security prior to recovering its amortized cost basis, the entire impairment amount is recognized as an adjustment to the debt security’s amortized cost basis, with a corresponding Provision for credit losses on the Consolidated Statement of Income. The amortized cost of the Company’s AFS debt securities excludes accrued interest, which is included in Other assets on the Consolidated Balance Sheet. The Company has made an accounting policy election to not recognize an allowance for credit losses for accrued interest receivables on AFS debt securities as the Company reverses any accrued interest if a debt security is impaired. As each AFS debt security has a unique security structure, where the accrual status is clearly determined when certain criteria listed in the terms are met, the Company assesses the default status of each security as defined by the debt security’s specific security structure. Allowance for Collateral-Dependent Financial Assets — A financial asset is considered collateral-dependent if repayment is expected to be provided substantially through the operation or sale of the collateral. The allowance for credit losses is measured on an individual basis for collateral-dependent financial assets and determined by comparing the fair value of the collateral, minus the cost to sell, to the amortized cost basis of the related financial asset at the reporting date. Other than impaired loans, collateral-dependent financial assets could also include resale agreements. In arrangements which the borrower must continually adjust the collateral securing the asset to reflect changes in the collateral’s fair value (e.g., resale agreements), the Company estimates the expected credit losses on the basis of the unsecured portion of the amortized cost as of the balance sheet date. If the fair value of the collateral is equal to or greater than the amortized cost of the resale agreement, the expected losses would be zero. If the fair value of the collateral is less than the amortized cost of the asset, the expected losses are limited to the difference between the fair value of the collateral and the amortized cost basis of the resale agreement. Allowance for Purchased Credit Deteriorated Assets — ASU 2016-13 replaces the concept of PCI accounting under ASC 310-30 Receivables - Loans and Debt Securities Acquired with Deteriorated Credit Quality with the concept of purchased financial assets with credit deterioration. The Company adopted ASU 2016-13 using the prospective transition approach for Purchased credit deteriorated (“PCD”) assets that were previously classified as PCI assets. PCD financial assets are defined as acquired individual financial assets (or groups with similar risk characteristics) that as of the date of acquisition, have experienced a more-than-insignificant deterioration in credit quality since origination. For PCD debt securities and PCD loans, the company records the allowance for credit losses by grossing up the initial amortized cost, which includes the purchase price and the allowance for credit losses. The expected credit losses of PCD debt securities are measured at the individual security level. The expected credit losses for PCD loans are measured based on the loan’s unpaid principal balance. Beginning January 1, 2020, for any asset designated as a PCD asset at the time of acquisition, the Company estimates and records an allowance for credit losses, which is added to the purchase price to establish the initial amortized cost basis of the financial asset. Hence, there is no income statement impact from the acquisition. Subsequent changes in the allowance for credit losses on PCD assets will be recognized in Provision for credit losses on the Consolidated Statement of Income. The noncredit discount or premium will be accreted to interest income based on the effective interest rate on the PCD assets determined after the gross-up for the allowance for credit losses. Troubled Debt Restructurings — The Company has implemented various loan modification programs to provide its borrowers relief from the economic impacts of the Coronavirus Disease 2019 (“COVID-19”). In accordance with the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”), the Company has elected to not apply TDR classification to any COVID-19 related loan modifications that were performed after March 1, 2020 to borrowers who were current as of December 31, 2019. For loans modified in response to the COVID-19 pandemic that do not meet the CARES Act criteria (e.g., current payment status at December 31, 2019), the Company has applied the guidance included in “Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customer Affected by the Coronavirus (Revised)” (the “Interagency Statement”) issued by the federal banking regulators on April 7, 2020. The Interagency Statement states that loan modifications performed in light of the COVID-19 pandemic, including loan payment deferrals that are up to six months in duration, that were granted to borrowers who were current as of the implementation date of a loan modification program or modifications granted under government mandated modification programs, are not TDRs. The delinquency of the loans modified under the CARES Act and Interagency Statement is frozen at the time of the modification, and interest income continues to be recognized over the contractual life of the loan. For more information on the Company's TDR accounting, see Note 1 — Summary of Significant Accounting Principles — Troubled Debt Restructurings to the Consolidated Financial Statements of the Company’s 2019 Annual Report on Form 10-K. Paycheck Protection Program (“PPP”) — In April 2020, the Company started accepting PPP applications and began to originate loans to qualified small businesses under the PPP established by the CARES Act. These loans are included in the C&I portfolio, carry an interest rate of 1%, and are 100% guaranteed by the Small Business Administration (“SBA”). No allowance for loan losses were recorded for these loans as of June 30, 2020. As of June 30, 2020, the Company has funded over 7,200 PPP loans for customers with an outstanding loan balance totaling $1.75 billion. The majority of the Company’s PPP loans have a term of two years. The SBA pays the Company fees for processing PPP loans in the following amounts: (1) five percent for loans of not more than $350,000; (2) three percent for loans of more than $350,000 and less than $2,000,000; and (3) one percent for loans of at least $2,000,000. Loan processing fees paid to the Company by the SBA are accounted for as loan origination fees, where net deferred fees are recognized over the estimated life of the loan as a yield adjustment on the loans. Payments by borrowers on PPP loans begin ten months after the loan forgiveness covered period. Under the terms of the PPP, such loans are eligible to be forgiven if certain conditions are satisfied, in which case the SBA will make payments to the Company for the forgiven amounts. If a loan is paid off or forgiven by the SBA prior to its projected estimated life, the remaining unamortized deferred fees will be recognized as interest income in that period.
Fair Value Determination	Fair Value Determination Fair value is defined as the price that would be received to sell an asset or the price that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. In determining the fair value of financial instruments, the Company uses various methods including market and income approaches. Based on these approaches, the Company utilizes certain assumptions that market participants would use in pricing an asset or a liability. These inputs can be readily observable, market corroborated or generally unobservable. The Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy noted below is based on the quality and reliability of the information used to determine fair value. The fair value hierarchy gives the highest priority to quoted prices available in active markets and the lowest priority to data lacking transparency. The fair value of the Company’s assets and liabilities is classified and disclosed in one of the following three categories: •Level 1 — Valuation is based on quoted prices for identical instruments traded in active markets. •Level 2 — Valuation is based on quoted prices for similar instruments traded in active markets; quoted prices for identical or similar instruments traded in markets that are not active; and model-derived valuations whose inputs are observable and can be corroborated by market data. •Level 3 — Valuation is based on significant unobservable inputs for determining the fair value of assets or liabilities. These significant unobservable inputs reflect assumptions that market participants may use in pricing the assets or liabilities. The classification of assets and liabilities within the hierarchy is based on whether inputs to the valuation methodology used are observable or unobservable, and the significance of those inputs in the fair value measurement. The Company’s assets and liabilities are classified in their entirety based on the lowest level of input that is significant to their fair value measurements.
Credit Quality Indicators	Credit Quality Indicators All loans are subject to the Company’s credit review and monitoring. For the commercial portfolio, loans are risk rated based on an analysis of the borrower’s current payment performance or delinquency, repayment sources, financial and liquidity factors, including industry and geographic considerations. For the majority of the consumer portfolio, payment performance or delinquency is the driving indicator for the risk ratings. For the Company’s internal credit risk ratings, each individual loan is given a risk rating of 1 through 10. Loans risk rated 1 through 5 are assigned an internal risk rating of “Pass”, with loans risk rated 1 being fully secured by cash or U.S. government securities. Pass loans have sufficient sources of repayment to repay the loan in full, in accordance with all terms and conditions. Loans assigned a risk rating of 6 have potential weaknesses that warrant closer attention by management; these are assigned an internal risk rating of “Special Mention”. Loans assigned a risk rating of 7 or 8 have well-defined weaknesses that may jeopardize the full and timely repayment of the loan; these are assigned an internal risk rating of “Substandard”. Loans assigned a risk rating of 9 have insufficient sources of repayment and a high probability of loss; these are assigned an internal risk rating of “Doubtful”. Loans assigned a risk rating of 10 are uncollectable and of such little value that they are no longer considered bankable assets; these are assigned an internal risk rating of “Loss”. The Company reviews the internal risk ratings for its loan portfolio on a regular and ongoing basis and make adjustments to the risk ratings based on changes in the borrowers’ financial status and the collectability of the loans.
Investments in Qualified Affordable Housing Partnerships, Net and Investments in Tax Credit and Other Investments, Net	The Company records its investments in qualified affordable housing partnerships, net, using the proportional amortization method. Under the proportional amortization method, the Company amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received, and recognizes the amortization in Income tax expense on the Consolidated Statement of Income.Depending on the ownership percentage and the influence the Company has on the investments in tax credit and other investments, net, the Company applies the equity or cost method of accounting, or the measurement alternative as elected under ASU 2016-01 for equity investments without readily determinable fair value.
Variable Interest Entities	Variable Interest Entities The Company invests in unconsolidated limited partnerships and similar entities that construct, own and operate affordable housing, historic rehabilitation projects, wind and solar projects, of which the majority of such investments are Variable interest entities (“VIEs”). As a limited partner in these partnerships, these investments are designed to generate a return primarily through the realization of federal tax credits and tax benefits. An unrelated third party is typically the general partner or managing member who has control over the significant activities of such investments. While the Company’s interest in some of the investments may exceed 50% of the outstanding equity interests, the Company does not consolidate these structures due to the general partner or managing member’s ability to manage the entity, which is indicative of power over them. The Company’s maximum exposure to loss in connection with these partnerships consist of the unamortized investment balance and any tax credits claimed that may become subject to recapture. Special purpose entities formed in connection with securitization transactions are generally considered VIEs. The Company is the servicer of the multifamily residential loans it has securitized in 2016. The Company does not consolidate the multifamily securitization entity because it does not have power and does not have a variable interest that could potentially be significant to the VIE. A CLO is a VIE that purchases a pool of assets consisting primarily of non-investment grade corporate loans and issues multiple tranches of notes to investors to fund the asset purchases and pay upfront expenses associated with forming the CLO. The Company serves as the collateral manager of a CLO that closed in the fourth quarter of 2019 and retained substantially all of the investment grade rated securities issued by the CLO. In accordance with GAAP, the Company does not consolidate the CLO as it does not hold interests that could potentially be significant to the CLO.
Goodwill and Core Deposit Intangibles	The Company assesses goodwill for impairment at the reporting unit level, equivalent to the same level as the Company’s business segments. This assessment is performed on an annual basis as of December 31 each year, or more frequently if events or circumstances, such as adverse changes in the economic or business environment, indicate there may be impairment. The Company organizes its operation into three reporting segments: (1) Consumer and Business Banking; (2) Commercial Banking; and (3) Other.Core deposit intangibles represent the intangible value of depositor relationships resulting from deposit liabilities assumed in various acquisitions and are included in Other assets on the Consolidated Balance Sheet. These intangibles are tested for impairment on an annual basis, or more frequently as events occur or current circumstances and conditions warrant.
Amortization Expense of Core Deposit Intangibles	The Company amortizes the core deposit intangibles based on the projected useful lives of the related deposits.
Litigation	Litigation — The Company is a party to various legal actions arising in the course of its business. In accordance with ASC 450, Contingencies, the Company accrues reserves for outstanding lawsuits, claims and proceedings when a loss contingency is probable and can be reasonably estimated. The Company estimates the amount of loss contingencies using current available information from legal proceedings, advice from legal counsel and available insurance coverage. Due to the inherent subjectivity of the assessments and unpredictability of the outcomes of the legal proceedings, any amounts accrued or included in this aggregate amount may not represent the ultimate loss to the Company from the legal proceedings in question. Thus, the Company’s exposure and ultimate losses may be higher, and possibly significantly more than the amounts accrued.
Revenue Recognition	Generally, the Company recognizes revenue from contracts with customers when it satisfies its performance obligations. The Company’s performance obligations are typically satisfied as services are rendered. The Company generally records contract liabilities, or deferred revenue, when payments from customers are received or due in advance of providing services. The Company records contract assets when services are provided to customers before payment is received or before payment is due.
Share-based Compensation	The amount of performance-based RSUs that are eligible to vest is determined at the end of each performance period and is then added together as the total number of performance shares to vest. Performance-based RSUs cliff vest three years from the date of each grant.Compensation costs for the time-based awards that will be settled in shares of the Company’s common stock are based on the quoted market price of the Company’s common stock at the grant date. Compensation costs for certain time-based awards that will be settled in cash are adjusted to fair value based on changes in the share price of the Company’s common stock up to the settlement date. Compensation costs associated with performance-based RSUs are based on grant date fair value which considers both market and performance conditions, and is subject to subsequent adjustments based on the changes in the Company’s projected outcome of the performance criteria. Compensation costs of both time-based and performance-based awards are estimated based on awards ultimately expected to vest and recognized on a straight-line basis from the grant date until the vesting date of each grant.

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- Definition Disclosure of accounting policy for fair value measurements of financial and non-financial assets, liabilities and instruments classified in shareholders' equity. Disclosures include, but are not limited to, how an entity that manages a group of financial assets and liabilities on the basis of its net exposure measures the fair value of those assets and liabilities. + References No definition available. + Details Name: us-gaap_FairValueMeasurementPolicyPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Disclosure of accounting policy for goodwill and intangible assets. This accounting policy also may address how an entity assesses and measures impairment of goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details Name: us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Disclosure of accounting policy for finite-lived intangible assets. This accounting policy also might address: (1) the amortization method used; (2) the useful lives of such assets; and (3) how the entity assesses and measures impairment of such assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 920 -SubTopic 350 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120155617&loc=SL120155638-234783 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 920 -SubTopic 350 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120155617&loc=SL120155628-234783 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 920 -SubTopic 350 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120155617&loc=SL120155628-234783 + Details Name: us-gaap_IntangibleAssetsFiniteLivedPolicy Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Disclosure of accounting policy for revenue from contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130561-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 20 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130566-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130563-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 20 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130566-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130563-203045 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18823-107790 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130566-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130564-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 20 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130566-203045 + Details Name: us-gaap_RevenueFromContractWithCustomerPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Disclosure of accounting policy for award under share-based payment arrangement. Includes, but is not limited to, methodology and assumption used in measuring cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(f) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details Name: us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Allowance for Loan Losses (Policies)	6 Months Ended
	Jun. 30, 2020
Text Block [Abstract]
Credit Loss, Financial Instrument	Allowance for Loan Losses On January 1, 2020, the Company adopted ASU 2016-13 that establishes a single allowance framework for all financial assets measured at amortized cost and certain off-balance sheet credit exposures. It requires the measurement of the allowance for loan losses to be based on management’s best estimate of lifetime expected credit losses inherent in the Company’s relevant financial assets. Balance sheet information and results for reporting periods beginning with January 1, 2020 are presented under ASC 326, while prior period comparisons continue to be presented under legacy GAAP. The process of the allowance for loan losses involves procedures to consider the unique risk characteristics of the portfolio segments. For each loan portfolio segment, the expected credit losses are estimated collectively for groups of loans with similar risk characteristics. For loans that do not share similar risk characteristics, the expected credit losses are estimated individually, which includes impaired loans. Allowance for Collectively Evaluated Loans Quantitative Component — The allowance for loan losses is estimated using quantitative methods that consider a variety of factors such as historical loss experience, the current credit quality of the portfolio as well as an economic outlook over the life of the loan. The Company incorporates forward-looking information through the use of macroeconomic scenarios applied over the forecasted life of the loans. These macroeconomic scenarios include variables that are considered key drivers of increases and decreases in credit losses. The Company utilizes a probability-weighted multiple scenario forecast approach. These scenarios may consist of a base forecast representing management's view of the most likely outcome, combined with and downside and upside scenarios reflecting possible worsening or improving economic conditions, respectively. A weighted average of these macroeconomic scenarios over a reasonable and supportable forecast period is incorporated into the quantitative models. If the loan’s life extends beyond the reasonable and supportable forecast period, then historical experience is considered over the remaining life of the loans in the allowance for loan losses. Qualitative Component — The Company also considers the following qualitative factors in the determination of collectively evaluated allowance if they have not already been captured by the quantitative model. Such qualitative factors may include, but not limited to: •Loan growth trends. •The volume and severity of past due financial assets and the volume and severity of adversely classified or rated financial assets. •The Company’s lending policies and procedures, including changes in lending strategies, underwriting standards, collection, write-off and recovery practices, as well as knowledge of the borrower’s operations or the borrower’s standing in the community. •The quality of the Company’s credit review system. •The experience, ability and depth of the Company’s management, lending staff and relevant staff. •The effect of other external factors such as the regulatory, legal and technological environments. •Actual and expected changes in international, national, regional, and local economic and business conditions and developments in which the Company operates, including the actual and expected condition of various market segments. The following table provides key credit risk characteristics and macroeconomic variables that the Company uses to estimate the expected credit losses by portfolio segments and methodologies: Portfolio Segment Risk Characteristics Macroeconomic Variables C&I Internal risk rating, size and credit spread at origination and time to maturity Unemployment rate and two and ten year treasury spread CRE, Multifamily residential, and Construction and land Delinquency status, maturity date, collateral value, property type and geographic location Unemployment rate, GDP and U.S. Treasury rates Single-family residential and HELOCs FICO, delinquency status, maturity date, collateral value and geographic location Unemployment rate, GDP and home price index Other consumer Historical loss experience Immaterial (1) (1)Macroeconomic variables were measured in the qualitative estimate. In light of the recessionary economic conditions and forecasts during the quarter, management updated its macroeconomic forecast used in the credit loss estimation process to reflect the sudden sharp and continued recession caused by the COVID-19 global pandemic, U.S. monetary and fiscal responses to the outbreak, oil price declines and other assumptions. The macroeconomic forecast used in the credit loss estimation for the quarter ended June 30, 2020 was more adverse compared to the prior quarter, as expectations for the unemployment rate and real GDP growth deteriorated and a slower recovery was expected. For the three and six months ended June 30, 2020, there were no changes to the reasonable and supportable forecast period, and reversion to historical loss experience method. Allowance for Loan Losses for the Commercial Loan Portfolio — The Company’s C&I lifetime loss rate model estimates credit losses by estimating a loss rate expected over the life of a loan. This loss rate is applied to the amortized cost basis, excluding accrued interest receivables, to determine expected credit losses. The lifetime loss rate model’s reasonable and supportable period spans eight quarters, thereafter immediately reverting to the historical average loss rate, expressed implicitly through the loan-level lifetime loss rate. The Company’s CRE probability of default (“PD”)/loss given default (“LGD”) models estimate the probability that a loan will default and, in the event of default, estimate the expected credit losses upon default. The product of the PD/LGD determines the Company’s CECL. The PD/LGD model assumptions and variable inputs span the entire contractual life of the loans, adjusted for expected prepayments. After a reasonable and supportable period, the forecast of future economic conditions reverts to long-run historical economic trends. The loan-specific variables apply over the lifetime of a loan. In order to estimate the life of a loan under both models, the contractual term of the loan is adjusted for estimated prepayments, which are based on historical prepayment experience. Allowance for Loan Losses for the Consumer Loan Portfolio — For single-family residential and HELOC loans, PD/LGD model assumptions and variable inputs span the entire contractual life of the loans, adjusted for expected prepayments. After a reasonable and supportable period, the forecast of future economic conditions reverts to long-run historical economic trends. The loan-specific variables apply over the lifetime of a loan. For other consumer loans, the Company uses a loss rate approach. In order to estimate the life of a loan, the contractual term of the loan is adjusted for estimated prepayments, which are based on historical prepayment experience. While the Company’s allowance methodologies strive to reflect all relevant credit risk factors, there continues to be uncertainty associated with, but not limited to, potential imprecision in the estimation process due to the inherent time lag of obtaining information and normal variations between expected and actual outcomes. The Company may hold additional reserves that are designed to provide coverage for losses attributable to such risk. The allowance for loan losses as of June 30, 2020 also included qualitative adjustments for certain industry sectors, such as oil & gas, which are included as part of the C&I loan portfolio, that the Company views as higher risk, where quantitative models may not have captured the additional exposure related to such industry sectors. Allowance for Individually Assessed Loans When a loan no longer shares similar risk characteristics with other loans, such as in the case for certain nonaccrual or TDR loans, the Company estimates the allowance for loan losses on an individual loan basis. The allowance for loan losses for individually evaluated loans is measured as the difference between the recorded value of the loans and their fair value. For loans evaluated individually, the Company uses one of three different asset valuation measurement methods: (1) the present value of expected future cash flows; (2) the fair value of collateral less costs to sell; and (3) the loan's observable market price. If an individually evaluated loan is determined to be collateral dependent, the Company applies the fair value of the collateral less costs to sell method. If an individually evaluated loan is determined to not be collateral dependent, the Company uses the present value of future cash flows or the observable market value of the loan. Collateral-Dependent Loans — When a loan is collateral dependent, the allowance is measured on an individual loan basis and is limited to the difference between the recorded value and fair value of the collateral less cost of disposal or sale.

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- Definition Disclosure of accounting policy for credit loss on financial instrument measured at amortized cost basis, net investment in lease, off-balance sheet credit exposure, and available-for-sale debt security. Includes, but is not limited to, methodology used to estimate allowance for credit loss, how writeoff of uncollectible amount is recognized, and determination of past due status and nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 35 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=121565518&loc=SL120269220-210453 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3D -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL120267969-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922895-210455 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 35 -Paragraph 13A -URI http://asc.fasb.org/extlink&oid=121565518&loc=SL120267917-210453 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 35 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=121648281&loc=SL120267834-210445 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 30 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=121647444&loc=SL120269210-210444 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919260-210447 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL120267845-210446 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919253-210447 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919272-210447 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 30 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=121647444&loc=SL120254536-210444 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3C -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL120267966-210447 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 30 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121614247&loc=SL120267897-210452 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919244-210447 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 3D -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL120267862-210455 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 3C -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL120267859-210455 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL120267853-210455 + Details Name: us-gaap_CreditLossFinancialInstrumentPolicyTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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v3.20.2

Current Accounting Developments and Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
New Accounting Pronouncements Adopted	New Accounting Pronouncements Adopted Standard Required Date of Adoption Description Effect on Financial Statements Standards Adopted in 2020 ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments and subsequent related ASUs January 1, 2020 Early adoption is permitted on January 1, 2019. The ASU introduces a new current expected credit loss (“CECL”) model that applies to most financial assets measured at amortized cost and certain instruments, including trade and other receivables, loan receivables, AFS and held-to-maturity debt securities, net investments in leases and off-balance sheet credit exposures. The CECL model utilizes a lifetime “expected credit loss” measurement objective for the recognition of credit losses at the time the financial asset is originated or acquired. The expected credit losses are adjusted in each period for changes in expected lifetime credit losses. ASU 2016-13 also eliminates the guidance for purchased credit impaired (“PCI”) loans, but requires an allowance for loan losses for purchased financial assets with more than an insignificant deterioration of credit since origination. The ASU also modifies the other-than-temporary impairment (“OTTI”) model for AFS debt securities to require an allowance for credit losses instead of a direct write-down. A reversal of the allowance for credit losses is allowed in future periods based on improvements in credit performance expectations. This ASU expands the disclosure requirements regarding an entity’s assumptions, models and methods for estimating the allowance for loan and lease losses, and requires disclosure of the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination (i.e., by vintage year). The guidance should be applied using a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption. The new guidance also allows optional relief for certain instruments measured at amortized cost with an option to irrevocably elect the fair value option under ASC Topic 825, Financial Instruments. The Company adopted ASU 2016-13 using a modified retrospective approach on January 1, 2020 without electing the fair value option on eligible financial instruments under ASU 2019-05. The adoption of this ASU increased the allowance for loan losses by $125.2 million, and allowance for unfunded credit commitments by $10.5 million and an after-tax decrease to opening retained earnings of $98.0 million on January 1, 2020. The increase to allowance for loan losses was primarily related to the commercial and industrial (“C&I”) and commercial real estate (“CRE”) loan portfolios. The Company did not record an allowance for credit losses related to the Company’s AFS debt securities as a result of this adoption. Disclosures for periods after January 1, 2020 are presented in accordance with ASC 326 while prior period amounts continue to be reported in accordance with previously applicable standards and the accounting policies described in the Company’s 2019 Form 10-K. The Company has elected the CECL phase-in option provided by regulatory capital rules, which delays the impact of CECL on regulatory capital for two years, followed by a three-year transition period. ASU 2017-04, Intangibles — Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment January 1, 2020 Early adoption is permitted for interim or annual goodwill impairment tests with measurement dates after January 1, 2017. The ASU simplifies the accounting for goodwill impairment. Under this guidance, an entity will no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, an impairment loss will be recognized when the carrying amount of a reporting unit exceeds its fair value and the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The guidance also eliminates the requirement to perform a qualitative assessment for any reporting units with a zero or negative carrying amount. This guidance should be applied prospectively. The Company adopted this guidance on January 1, 2020. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements. ASU 2018-15, Intangibles — Goodwill and Other — Internal-Use Software (Subtopic 350-40) Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract January 1, 2020 The ASU amends ASC Topic 350-40 to align the accounting for costs incurred in a cloud computing arrangement with the guidance on developing internal use software. Specifically, if a cloud computing arrangement is deemed to be a service contract, certain implementation costs are eligible for capitalization. The new guidance prescribes the balance sheet and income statement presentation and cash flow classification for the capitalized costs and related amortization expense. The amendments in this ASU should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company adopted this guidance on a prospective basis on January 1, 2020. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements. Recent Accounting Pronouncement Standard Required Date of Adoption Description Effect on Financial Statements Standard Not Yet Adopted ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting Effective for all entities as of March 12, 2020 through December 31, 2022. In March 2020, the FASB issued a new accounting standard related to contracts or hedging relationships that reference London interbank offered rate or other reference rates that are expected to be discontinued due to reference rate reform. This ASU provides temporary optional expedients and exceptions regarding the accounting requirements related to the modification of certain contracts, hedging relationships and other transactions that are affected by the reference rate reform. The guidance permits the Company to make a one-time election to sell and/or transfer qualifying held-to-maturity securities, and not to apply modification accounting or remeasure lease payments in lease contracts if the changes to the contract are related to the discontinuation of the reference rate. If certain criteria are met, the amendments also allow exceptions to the de-designation criteria of the hedging relationship and the assessment of hedge effectiveness during the transition period. This one time election may be made at any time after March 12, 2020, but no later than December 31, 2022. The Company has not yet made a determination on whether it will make this election and is currently tracking the exposure as of each reporting period and assessing the significance of impact towards implementing any necessary modification in consideration of the election of this amendment. The Company will continue to assess the impact as the reference rate transition occurs over the next two years.

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=116846552&loc=d3e765-108305 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=116846552&loc=d3e725-108305 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794 + Details Name: us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Fair Value Measurement and Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2020
Fair Value, Financial Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Schedule of financial assets (liabilities) measured at fair value on a recurring basis	The following tables present financial assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2020 and December 31, 2019: ($ in thousands) Assets and Liabilities Measured at Fair Value on a Recurring Basis as of June 30, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fair Value AFS debt securities: U.S. Treasury securities $ 251,201    $ —    $ —    $ 251,201    U.S. government agency and U.S. government- sponsored enterprise debt securities —    442,644    —    442,644    U.S. government agency and U.S. government- sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities —    858,440    —    858,440    Residential mortgage-backed securities —    1,280,895    —    1,280,895    Municipal securities —    215,184    —    215,184    Non-agency mortgage-backed securities: Commercial mortgage-backed securities —    151,368    —    151,368    Residential mortgage-backed securities —    114,338    —    114,338    Corporate debt securities —    30,826    —    30,826    Foreign bonds —    204,080    —    204,080    Asset-backed securities —    61,619    —    61,619    Collateralized loan obligations (“CLOs”) —    273,979    —    273,979    Total AFS debt securities $ 251,201    $ 3,633,373    $ —    $ 3,884,574    Investments in tax credit and other investments: Equity securities (1) $ 22,462    $ 8,680    $ —    $ 31,142    Total investments in tax credit and other investments $ 22,462    $ 8,680    $ —    $ 31,142    Derivative assets: Interest rate contracts $ —    $ 613,480    $ —    $ 613,480    Foreign exchange contracts —    24,289    —    24,289    Credit contracts —    41    —    41    Equity contracts —    8,857    316    9,173    Commodity contracts —    117,447    —    117,447    Gross derivative assets $ —    $ 764,114    $ 316    $ 764,430    Netting adjustments (2) $ —    $ (122,218)   $ —    $ (122,218)   Net derivative assets $ —    $ 641,896    $ 316    $ 642,212    Derivative liabilities: Interest rate contracts $ —    $ 401,803    $ —    $ 401,803    Foreign exchange contracts —    19,741    —    19,741    Credit contracts —    327    —    327    Commodity contracts —    138,298    —    138,298    Gross derivative liabilities $ —    $ 560,169    $ —    $ 560,169    Netting adjustments (2) $ —    $ (205,004)   $ —    $ (205,004)   Net derivative liabilities $ —    $ 355,165    $ —    $ 355,165    (1)Equity securities consist of mutual funds with readily determinable fair values. (2)Represents balance sheet netting of derivative assets and liabilities and related cash collateral under master netting agreements or similar agreements. See Note 6 — Derivatives to the Consolidated Financial Statements in this Form 10-Q for additional information. ($ in thousands) Assets and Liabilities Measured at Fair Value on a Recurring Basis as of December 31, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fair Value AFS debt securities: U.S. Treasury securities $ 176,422    $ —    $ —    $ 176,422    U.S. government agency and U.S. government- sponsored enterprise debt securities —    581,245    —    581,245    U.S. government agency and U.S. government- sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities —    603,471    —    603,471    Residential mortgage-backed securities —    1,003,897    —    1,003,897    Municipal securities —    102,302    —    102,302    Non-agency mortgage-backed securities: Commercial mortgage-backed securities —    88,550    —    88,550    Residential mortgage-backed securities —    46,548    —    46,548    Corporate debt securities —    11,149    —    11,149    Foreign bonds —    354,172    —    354,172    Asset-backed securities —    64,752    —    64,752    CLOs —    284,706    —    284,706    Total AFS debt securities $ 176,422    $ 3,140,792    $ —    $ 3,317,214    Investments in tax credit and other investments: Equity securities (1) $ 21,746    $ 9,927    $ —    $ 31,673    Total investments in tax credit and other investments $ 21,746    $ 9,927    $ —    $ 31,673    Derivative assets: Interest rate contracts $ —    $ 192,883    $ —    $ 192,883    Foreign exchange contracts —    54,637    —    54,637    Credit contracts —    2    —    2    Equity contracts —    993    421    1,414    Commodity contracts —    81,380    —    81,380    Gross derivative assets $ —    $ 329,895    $ 421    $ 330,316    Netting adjustments (2) $ —    $ (125,319)   $ —    $ (125,319)   Net derivative assets $ —    $ 204,576    $ 421    $ 204,997    Derivative liabilities: Interest rate contracts $ —    $ 127,317    $ —    $ 127,317    Foreign exchange contracts —    48,610    —    48,610    Credit contracts —    84    —    84    Commodity contracts —    80,517    —    80,517    Gross derivative liabilities $ —    $ 256,528    $ —    $ 256,528    Netting adjustments (2) $ —    $ (159,799)   $ —    $ (159,799)   Net derivative liabilities $ —    $ 96,729    $ —    $ 96,729    (1)Equity securities consist of mutual funds with readily determinable fair values. (2)Represents balance sheet netting of derivative assets and liabilities and related cash collateral under master netting agreements or similar agreements. See Note 6 — Derivatives to the Consolidated Financial Statements in this Form 10-Q for additional information.
Reconciliation of the beginning and ending balances for equity warrants measured at fair value on a recurring basis using significant unobservable inputs (Level 3)	The following table provides a reconciliation of the beginning and ending balances of these equity warrants for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Equity Contracts Beginning balance $ 713    $ 442    $ 421    $ 673    Total gains included in earnings (1) 7,976    769    8,268    538    Issuances —    28    —    28    Settlements —    (847)   —    (847)   Transfers out of Level 3 (2) (8,373)   —    (8,373)   —    Ending balance $ 316    $ 392    $ 316    $ 392    (1)Includes unrealized gains (losses) of $8.0 million and $(4) thousand for the three months ended June 30, 2020 and 2019, respectively, and $8.3 million and $(235) thousand for the six months ended June 30, 2020 and 2019, respectively. The realized/unrealized gains (losses) of equity warrants are included in Lending fees on the Consolidated Statement of Income. (2)During the three and six months ended June 30, 2020, the Company transferred $8.4 million of equity contracts measured on a recurring basis out of Level 3 into Level 2 after the corresponding issuer of the equity warrant, which was previously a private company, completed its initial public offering and became a public company.
Schedule of carrying amounts of assets that were still held and had fair value changes measured on a nonrecurring basis	The following tables present the carrying amounts of assets that were still held and had fair value changes measured on a nonrecurring basis as of June 30, 2020 and December 31, 2019: ($ in thousands) Assets Measured at Fair Value on a Nonrecurring Basis as of June 30, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fair Value Measurements Individually evaluated loans (1): Commercial: C&I $ —    $ —    $ 53,122    $ 53,122    CRE: CRE —    —    50,453    50,453    Total commercial —    —    103,575    103,575    Consumer: Residential mortgage: HELOCs —    —    3,338    3,338    Other consumer —    —    2,491    2,491    Total consumer —    —    5,829    5,829    Total individually evaluated loans $ —    $ —    $ 109,404    $ 109,404    Investments in tax credit and other investments, net $ —    $ —    $ 6,216    $ 6,216    ($ in thousands) Assets Measured at Fair Value on a Nonrecurring Basis as of December 31, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fair Value Measurements Non-PCI impaired loans: Commercial: C&I $ —    $ —    $ 47,554    $ 47,554    CRE: CRE —    —    753    753    Total commercial —    —    48,307    48,307    Consumer: Residential mortgage: HELOCs —    —    1,372    1,372    Total consumer —    —    1,372    1,372    Total non-PCI impaired loans $ —    $ —    $ 49,679    $ 49,679    OREO (2) $ —    $ —    $ 125    $ 125    Investments in tax credit and other investments, net $ —    $ —    $ 3,076    $ 3,076    Other nonperforming assets $ —    $ —    $ 1,167    $ 1,167    (1)The Company adopted ASU 2016-13 using the prospective transition approach for PCD loans that were previously accounted for as PCI loans. Total individually evaluated loans as of June 30, 2020 considers PCD loans, if impaired, whereas the impaired loans as of December 31, 2019 include only non-PCI loans. (2)Amounts are included in Other assets on the Consolidated Balance Sheet and represent the carrying value of OREO properties that were written down subsequent to their initial classification as OREO.
Schedule of increase (decrease) in fair value of assets for which a fair value adjustment has been recognized, nonrecurring basis	The following table presents the increase (decrease) in fair value of assets for which a nonrecurring fair value adjustment has been recognized for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Individually Evaluated Loans (1) Non-PCI Impaired Loans Individually Evaluated Loans (1) Non-PCI Impaired Loans Loans: Commercial: C&I $ (8,846)   $ (24,001)   $ (30,372)   $ (25,823)   CRE: CRE (271)   2    (276)   4    Total commercial (9,117)   (23,999)   (30,648)   (25,819)   Consumer: Residential mortgage: HELOCs (64)   —    (257)   —    Other consumer —    —    2,491    —    Total consumer (64)   —    2,234    —    Total loans $ (9,181)   $ (23,999)   $ (28,414)   $ (25,819)   OREO $ —    $ (3)   $ —    $ (3)   Investments in tax credit and other investments, net $ (733)   $ (2,892)   $ (583)   $ (9,870)   Other nonperforming assets $ —    $ —    $ —    $ (3,000)   (1)The Company adopted ASU 2016-13 using the prospective transition approach for PCD loans that were previously accounted for as PCI loans. Total individually evaluated loans during the three and six months ended June 30, 2020 considers PCD loans, if impaired, whereas impaired loans during the three and six months ended June 30, 2019 include only non-PCI loans.
Schedule of the carrying and fair value estimates per the fair value hierarchy of financial instruments measured on a nonrecurring basis	The following tables present the fair value estimates for financial instruments as of June 30, 2020 and December 31, 2019, excluding financial instruments recorded at fair value on a recurring basis as they are included in the tables presented elsewhere in this Note. The carrying amounts in the following tables are recorded on the Consolidated Balance Sheet under the indicated captions, except for accrued interest receivable and mortgage servicing rights that are included in Other assets, and accrued interest payable that is included in Accrued expenses and other liabilities. These financial assets and liabilities are measured at amortized cost basis on the Company’s Consolidated Balance Sheet. ($ in thousands) June 30, 2020 Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value Financial assets: Cash and cash equivalents $ 4,533,502    $ 4,533,502    $ —    $ —    $ 4,533,502    Interest-bearing deposits with banks $ 531,591    $ —    $ 531,591    $ —    $ 531,591    Resale agreements (1) $ 1,260,000    $ —    $ 1,263,068    $ —    $ 1,263,068    Restricted equity securities, at cost $ 78,963    $ —    $ 78,963    $ —    $ 78,963    Loans held-for-sale $ 3,875    $ —    $ 3,875    $ —    $ 3,875    Loans held-for-investment, net $ 36,597,341    $ —    $ —    $ 36,714,052    $ 36,714,052    Mortgage servicing rights $ 5,363    $ —    $ —    $ 7,798    $ 7,798    Accrued interest receivable $ 149,595    $ —    $ 149,595    $ —    $ 149,595    Financial liabilities: Demand, checking, savings and money market deposits $ 31,410,130    $ —    $ 31,410,130    $ —    $ 31,410,130    Time deposits $ 9,262,548    $ —    $ 9,295,199    $ —    $ 9,295,199    Short-term borrowings $ 252,851    $ —    $ 252,851    $ —    $ 252,851    FHLB advances $ 656,759    $ —    $ 667,996    $ —    $ 667,996    Repurchase agreements (1) $ 300,000    $ —    $ 320,361    $ —    $ 320,361    Long-term debt $ 1,575,653    $ —    $ 1,578,801    $ —    $ 1,578,801    Accrued interest payable $ 23,007    $ —    $ 23,007    $ —    $ 23,007    ($ in thousands) December 31, 2019 Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value Financial assets: Cash and cash equivalents $ 3,261,149    $ 3,261,149    $ —    $ —    $ 3,261,149    Interest-bearing deposits with banks $ 196,161    $ —    $ 196,161    $ —    $ 196,161    Resale agreements (1) $ 860,000    $ —    $ 856,025    $ —    $ 856,025    Restricted equity securities, at cost $ 78,580    $ —    $ 78,580    $ —    $ 78,580    Loans held-for-sale $ 434    $ —    $ 434    $ —    $ 434    Loans held-for-investment, net $ 34,420,252    $ —    $ —    $ 35,021,300    $ 35,021,300    Mortgage servicing rights $ 6,068    $ —    $ —    $ 8,199    $ 8,199    Accrued interest receivable $ 144,599    $ —    $ 144,599    $ —    $ 144,599    Financial liabilities: Demand, checking, savings and money market deposits $ 27,109,951    $ —    $ 27,109,951    $ —    $ 27,109,951    Time deposits $ 10,214,308    $ —    $ 10,208,895    $ —    $ 10,208,895    Short-term borrowings $ 28,669    $ —    $ 28,669    $ —    $ 28,669    FHLB advances $ 745,915    $ —    $ 755,371    $ —    $ 755,371    Repurchase agreements (1) $ 200,000    $ —    $ 232,597    $ —    $ 232,597    Long-term debt $ 147,101    $ —    $ 152,641    $ —    $ 152,641    Accrued interest payable $ 27,246    $ —    $ 27,246    $ —    $ 27,246    (1)Resale and repurchase agreements are reported net pursuant to ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements. As of June 30, 2020, none of the $300.0 million of gross repurchase agreements were eligible for netting against gross resale agreements. Out of $450.0 million of gross repurchase agreements, $250.0 million were eligible for netting against gross resale agreements as of December 31, 2019
Fair Value, Measurements, Recurring
Fair Value, Financial Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Schedule of quantitative information about significant unobservable inputs used in the valuation of Level 3 fair value measurements	The following table presents quantitative information about the significant unobservable inputs used in the valuation of Level 3 fair value measurements as of June 30, 2020 and December 31, 2019, respectively. The significant unobservable inputs presented in the table below are those that the Company considers significant to the fair value of the Level 3 assets. The Company considers unobservable inputs to be significant if, by their exclusion, the fair value of the Level 3 assets would be impacted by a predetermined percentage change. ($ in thousands) Fair Value Measurements (Level 3) Valuation Technique Unobservable Inputs Range of Inputs Weighted- Average (1) June 30, 2020 Derivative assets: Equity contracts $ 316    Black-Scholes option pricing model Equity volatility 58% — 70% 63% Liquidity discount 47% 47% December 31, 2019 Derivative assets: Equity contracts $ 421    Black-Scholes option pricing model Equity volatility 39% — 44% 42% Liquidity discount 47% 47% (1)Weighted-average is calculated based on fair value of equity warrants as of June 30, 2020 and December 31, 2019.
Fair Value, Measurements, Nonrecurring
Fair Value, Financial Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Schedule of quantitative information about significant unobservable inputs used in the valuation of Level 3 fair value measurements	The following table presents the quantitative information about the significant unobservable inputs used in the valuation of Level 3 fair value measurements that are measured on a nonrecurring basis as of June 30, 2020 and December 31, 2019: ($ in thousands) Fair Value Measurements (Level 3) Valuation Techniques Unobservable Inputs Range of  Inputs Weighted- Average of Inputs (1) June 30, 2020 Individually evaluated loans (2) $ 29,949    Discounted cash flows Discount 4% — 15% 10% $ 5,658    Fair value of collateral Discount 10% — 63% 19% $ 21,452    Fair value of collateral Contract value NM NM $ 52,345    Fair value of property Selling cost 8% 8% Investments in tax credit and other investments, net $ 6,216    Individual analysis of each investment Expected future tax benefits and distributions NM NM December 31, 2019 Non-PCI impaired loans $ 27,841    Discounted cash flows Discount 4% — 15% 14% $ 1,014    Fair value of collateral Discount 8% — 20% 19% $ 20,824    Fair value of collateral Contract value NM NM OREO $ 125    Fair value of property Selling cost 8% 8% Other nonperforming assets $ 1,167    Fair value of collateral Contract value NM NM Investments in tax credit and other investments, net $ 3,076    Individual analysis of each investment Expected future tax benefits and distributions NM NM NM — Not meaningful. (1)Weighted-average of inputs is based on the relative fair value of the respective assets as of June 30, 2020 and December 31, 2019. (2)The Company adopted ASU 2016-13 using the prospective transition approach for PCD loans that were previously accounted for as PCI loans. Total individually evaluated loans as of June 30, 2020 considers PCD loans, if impaired, whereas the impaired loans as of December 31, 2019 include only non-PCI loans.

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details Name: us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details Name: us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details Name: us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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v3.20.2

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Tables)	6 Months Ended
	Jun. 30, 2020
RESALE AND REPURCHASE AGREEMENTS [Abstract]
Schedule of balance sheet offsetting for resale and repurchase agreements	The following tables present the resale and repurchase agreements included on the Consolidated Balance Sheet as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 Gross Amounts of Recognized Assets Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts of Assets Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Assets Net Amount Collateral Received Resale agreements $ 1,260,000    $ —    $ 1,260,000    $ (1,258,866)   (1) $ 1,134    Gross Amounts of Recognized Liabilities Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts of Liabilities Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Liabilities Net Amount Collateral Pledged Repurchase agreements $ 300,000    $ —    $ 300,000    $ (300,000)   (2) $ —    ($ in thousands) December 31, 2019 Gross Amounts of Recognized Assets Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts of Assets Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Assets Net Amount Collateral Received Resale agreements $ 1,110,000    $ (250,000)   $ 860,000    $ (856,058)   (1) $ 3,942    Gross Amounts of Recognized Liabilities Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts of Liabilities Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Liabilities Net Amount Collateral Pledged Repurchase agreements $ 450,000    $ (250,000)   $ 200,000    $ (200,000)   (2) $ —    (1)Represents the fair value of securities the Company has received under resale agreements, limited for table presentation purposes to the amount of the recognized asset due from each counterparty. The application of collateral cannot reduce the net position below zero. Therefore, excess collateral, if any, is not reflected above. (2)Represents the fair value of securities the Company has pledged under repurchase agreements, limited for table presentation purposes to the amount of the recognized liability due to each counterparty. The application of collateral cannot reduce the net position below zero. Therefore, excess collateral, if any, is not reflected above.

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- Definition Tabular disclosure of securities financing transactions including resale and repurchase agreements, securities borrowed and lending transactions, securities received as collateral and obligations to return securities received as collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225877-175312 + Details Name: us-gaap_ScheduleOfSecuritiesFinancingTransactionsTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Securities (Tables)	6 Months Ended
	Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and fair value by major categories of AFS debt securities	The following tables present the amortized cost, gross unrealized gains and losses, and fair value by major categories of AFS debt securities as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value AFS debt securities: U.S. Treasury securities $ 250,494    $ 707    $ —    $ 251,201    U.S. government agency and U.S. government-sponsored enterprise debt securities 433,923    8,853    (132)   442,644    U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 827,929    34,585    (4,074)   858,440    Residential mortgage-backed securities 1,246,609    34,445    (159)   1,280,895    Municipal securities 208,333    7,002    (151)   215,184    Non-agency mortgage-backed securities: Commercial mortgage-backed securities 148,322    3,989    (943)   151,368    Residential mortgage-backed securities 113,548    804    (14)   114,338    Corporate debt securities 31,254    74    (502)   30,826    Foreign bonds 204,540    106    (566)   204,080    Asset-backed securities 64,762    —    (3,143)   61,619    CLOs 294,000    —    (20,021)   273,979    Total AFS debt securities $ 3,823,714    $ 90,565    $ (29,705)   $ 3,884,574    ($ in thousands) December 31, 2019 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value AFS debt securities: U.S. Treasury securities $ 177,215    $ —    $ (793)   $ 176,422    U.S. government agency and U.S. government-sponsored enterprise debt securities 584,275    1,377    (4,407)   581,245    U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 599,814    8,551    (4,894)   603,471    Residential mortgage-backed securities 998,447    6,927    (1,477)   1,003,897    Municipal securities 101,621    790    (109)   102,302    Non-agency mortgage-backed securities: Commercial mortgage-backed securities 86,609    1,947    (6)   88,550    Residential mortgage-backed securities 46,830    3    (285)   46,548    Corporate debt securities 11,250    12    (113)   11,149    Foreign bonds 354,481    198    (507)   354,172    Asset-backed securities 66,106    —    (1,354)   64,752    CLOs 294,000    —    (9,294)   284,706    Total AFS debt securities $ 3,320,648    $ 19,805    $ (23,239)   $ 3,317,214
Schedule of fair value and associated gross unrealized losses of AFS debt securities	The following tables present the fair value and the associated gross unrealized losses of the Company’s AFS debt securities, aggregated by investment category and the length of time that the securities have been in a continuous unrealized loss position as of June 30, 2020 and December 31, 2019. ($ in thousands) June 30, 2020 Less Than 12 Months 12 Months or More Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses AFS debt securities: U.S. government agency and U.S. government sponsored enterprise debt securities $ 24,868    $ (132)   $ —    $ —    $ 24,868    $ (132)   U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 139,097    (3,477)   11,572    (597)   150,669    (4,074)   Residential mortgage-backed securities 91,491    (157)   195    (2)   91,686    (159)   Municipal securities 8,617    (151)   —    —    8,617    (151)   Non-agency mortgage-backed securities: Commercial mortgage-backed securities 59,418    (943)   —    —    59,418    (943)   Residential mortgage-backed securities 23,720    (14)   —    —    23,720    (14)   Corporate debt securities 1,002    (2)   9,500    (500)   10,502    (502)   Foreign bonds 85,274    (566)   —    —    85,274    (566)   Asset-backed securities 18,359    (483)   43,260    (2,660)   61,619    (3,143)   CLOs 273,979    (20,021)   —    —    273,979    (20,021)   Total AFS debt securities $ 725,825    $ (25,946)   $ 64,527    $ (3,759)   $ 790,352    $ (29,705)   ($ in thousands) December 31, 2019 Less Than 12 Months 12 Months or More Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses AFS debt securities: U.S. Treasury securities $ —    $ —    $ 176,422    $ (793)   $ 176,422    $ (793)   U.S. government agency and U.S. government-sponsored enterprise debt securities 310,349    (4,407)   —    —    310,349    (4,407)   U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 204,675    (2,346)   108,314    (2,548)   312,989    (4,894)   Residential mortgage-backed securities 325,354    (1,234)   34,337    (243)   359,691    (1,477)   Municipal securities 31,130    (109)   —    —    31,130    (109)   Non-agency mortgage-backed securities: Commercial mortgage-backed securities 7,914    (6)   —    —    7,914    (6)   Residential mortgage-backed securities 42,894    (285)   —    —    42,894    (285)   Corporate debt securities —    —    9,888    (113)   9,888    (113)   Foreign bonds 129,074    (407)   9,900    (100)   138,974    (507)   Asset-backed securities 52,565    (902)   12,187    (452)   64,752    (1,354)   CLOs 284,706    (9,294)   —    —    284,706    (9,294)   Total AFS debt securities $ 1,388,661    $ (18,990)   $ 351,048    $ (4,249)   $ 1,739,709    $ (23,239)
Schedule of the proceeds, gross realized gains, and tax expense related to the sales of AFS debt securities	The following table presents the proceeds, gross realized gains and tax expense related to the sales of AFS debt securities for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Proceeds from sales $ 177,917    $ 223,763    $ 484,380    $ 375,102    Gross realized gains $ 9,640    $ 1,447    $ 11,169    $ 3,008    Related tax expense $ 2,850    $ 428    $ 3,302    $ 889
Schedule of contractual maturities of AFS debt securities	The following table presents the contractual maturities of AFS debt securities as of June 30, 2020. Expected maturities will differ from contractual maturities on certain securities as the issuers and borrowers of the underlying collateral may have the right to call or prepay obligations with or without prepayment penalties. ($ in thousands) Amortized Cost Fair Value Due within one year $ 561,935    $ 562,869    Due after one year through five years 366,403    371,895    Due after five years through ten years 277,823    289,730    Due after ten years 2,617,553    2,660,080    Total AFS debt securities $ 3,823,714    $ 3,884,574
Schedule of restricted equity securities	The following table presents the restricted equity securities on the Consolidated Balance Sheet as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 December 31, 2019 Federal Reserve Bank (“FRB”) stock $ 58,781    $ 58,330    FHLB stock 20,182    20,250    Total restricted equity securities $ 78,963    $ 78,580

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details Name: us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details Name: us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details Name: us-gaap_ScheduleOfRealizedGainLossTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 + Details Name: us-gaap_ScheduleOfUnrealizedLossOnInvestmentsTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Derivatives (Tables)	6 Months Ended
	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of notional and gross fair values of derivatives	The following table presents the total notional amounts and gross fair values of the Company’s derivatives, as well as the balance sheet netting adjustments on an aggregate basis as of June 30, 2020 and December 31, 2019. The derivative assets and liabilities are presented on a gross basis prior to the application of bilateral collateral and master netting agreements, but after the variation margin payments with central clearing organizations have been applied as settlement, as applicable. Total derivative assets and liabilities are adjusted to take into consideration the effects of legally enforceable master netting agreements and cash collateral received or paid as of June 30, 2020 and December 31, 2019. The resulting net derivative asset and liability fair values are included in Other assets and Accrued expenses and other liabilities, respectively, on the Consolidated Balance Sheet. ($ in thousands) June 30, 2020 December 31, 2019 Notional Amount Fair Value Notional Amount Fair Value Derivative Assets  Derivative Liabilities  Derivative Assets  Derivative Liabilities  Derivatives designated as hedging instruments: Fair value hedges: Interest rate contracts $ 15,194    $ —    $ 174    $ 31,026    $ —    $ 3,198    Cash flow hedges: Interest rate contracts 275,000    —    1,483    —    —    —    Net investment hedges: Foreign exchange contracts 77,689    245    —    86,167    —    1,586    Total derivatives designated as hedging instruments $ 367,883    $ 245    $ 1,657    $ 117,193    $ —    $ 4,784    Derivatives not designated as hedging instruments: Interest rate contracts $ 17,170,884    $ 613,480    $ 400,146    $ 15,489,692    $ 192,883    $ 124,119    Foreign exchange contracts 2,738,018    24,044    19,741    4,839,661    54,637    47,024    Credit contracts 204,498    41    327    210,678    2    84    Equity contracts —    (1) 9,173    —    —    (1) 1,414    —    Commodity contracts —    (2) 117,447    138,298    —    (2) 81,380    80,517    Total derivatives not designated as hedging instruments $ 20,113,400    $ 764,185    $ 558,512    $ 20,540,031    $ 330,316    $ 251,744    Gross derivative assets/liabilities $ 764,430    $ 560,169    $ 330,316    $ 256,528    Less: Master netting agreements (110,569)   (110,569)   (121,561)   (121,561)   Less: Cash collateral received/paid (11,649)   (94,435)   (3,758)   (38,238)   Net derivative assets/liabilities $ 642,212    $ 355,165    $ 204,997    $ 96,729    (1)The Company held equity contracts in three public companies and 17 private companies as of June 30, 2020. In comparison, the Company held equity contracts in three public companies and 18 private companies as of December 31, 2019. (2)The notional amount of the Company’s commodity contracts entered with its customers totaled 6,155 thousand barrels of crude oil and 84,957 thousand units of natural gas, measured in million British thermal units (“MMBTUs”) as of June 30, 2020. In comparison, the notional amount of the Company’s commodity contracts entered with its customers totaled 7,811 thousand barrels of crude oil and 63,773 thousand MMBTUs of natural gas as of December 31, 2019. The Company simultaneously entered into the offsetting commodity contracts with mirrored terms with third-party financial institutions. The following tables present the notional amounts and the gross fair values of interest rate derivative contracts outstanding as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 Customer Counterparty ($ in thousands) Financial Counterparty Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities Written options $ 858,996    $ —    $ 241    Purchased options $ 858,996    $ 241    $ —    Sold collars and corridors 531,098    10,658    1    Collars and corridors 531,098    1    10,696    Swaps 7,179,331    601,250    —    Swaps 7,211,365    1,330    389,208    Total $ 8,569,425    $ 611,908    $ 242    Total $ 8,601,459    $ 1,572    $ 399,904    ($ in thousands) December 31, 2019 Customer Counterparty ($ in thousands) Financial Counterparty Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities Written options $ 1,003,558    $ —    $ 66    Purchased options $ 1,003,558    $ 67    $ —    Sold collars and corridors 490,852    1,971    16    Collars and corridors 490,852    17    1,996    Swaps 6,247,667    187,294    6,237    Swaps 6,253,205    3,534    115,804    Total $ 7,742,077    $ 189,265    $ 6,319    Total $ 7,747,615    $ 3,618    $ 117,800    The following tables present the notional amounts and the gross fair values of foreign exchange derivative contracts outstanding as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 Customer Counterparty ($ in thousands) Financial Counterparty Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities Forwards and spot $ 1,768,864    $ 17,940    $ 14,246    Forwards and spot $ 62,424    $ 62    $ 98    Swaps 7,160    —    42    Swaps 734,640    4,502    3,808    Collars 1,685    2    —    Collars 162,245    1,538    1,547    Total $ 1,777,709    $ 17,942    $ 14,288    Total $ 959,309    $ 6,102    $ 5,453    ($ in thousands) December 31, 2019 Customer Counterparty ($ in thousands) Financial Counterparty Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities Forwards and spot $ 3,581,036    $ 45,911    $ 40,591    Forwards and spot $ 207,492    $ 1,400    $ 507    Swaps 6,889    16    84    Swaps 702,391    6,156    4,712    Written options 87,036    127    —    Purchased options 87,036    —    127    Collars 2,244    —    14    Collars 165,537    1,027    989    Total $ 3,677,205    $ 46,054    $ 40,689    Total $ 1,162,456    $ 8,583    $ 6,335    The following table presents the notional amounts and the gross fair values of RPAs sold and purchased outstanding as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 December 31, 2019 Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities RPAs - protection sold $ 193,783    $ —    $ 327    $ 199,964    $ —    $ 84    RPAs - protection purchased 10,714    41    —    10,714    2    —    Total RPAs $ 204,497    $ 41    $ 327    $ 210,678    $ 2    $ 84    The following tables present the notional amounts and fair values of the commodity derivative positions outstanding as of June 30, 2020 and December 31, 2019: ($ and units in thousands) June 30, 2020 Customer Counterparty ($ and units in thousands) Financial Counterparty Notional Unit Fair Value Notional Unit Fair Value Assets Liabilities Assets Liabilities Crude oil: Crude oil: Written options —    Barrels $ —    $ 70    Purchased options —    Barrels $ 70    $ —    Collars 1,966    Barrels 63    20,463    Collars 2,218    Barrels 21,847    1,607    Swaps 4,189    Barrels 1,273    51,320    Swaps 4,261    Barrels 32,875    1,779    Total 6,155    $ 1,336    $ 71,853    Total 6,479    $ 54,792    $ 3,386    Natural gas: Natural gas: Written options 1,033    MMBTUs $ —    $ 172    Purchased Options 1,023    MMBTUs $ 157    $ —    Collars 13,066    MMBTUs 881    955    Collars 13,186    MMBTUs 883    881    Swaps 70,858    MMBTUs 29,550    31,988    Swaps 78,528    MMBTUs 29,848    29,063    Total 84,957    $ 30,431    $ 33,115    Total 92,737    $ 30,888    $ 29,944    Total $ 31,767    $ 104,968    Total $ 85,680    $ 33,330    ($ and units in thousands) December 31, 2019 Customer Counterparty ($ and units in thousands) Financial Counterparty Notional Unit Fair Value Notional Unit Fair Value Assets Liabilities Assets Liabilities Crude oil: Crude oil: Written options 36    Barrels $ —    $ 30    Purchased options 36    Barrels $ 29    $ —    Collars 3,174    Barrels 2,673    538    Collars 3,630    Barrels 677    2,815    Swaps 4,601    Barrels 6,949    5,531    Swaps 4,721    Barrels 4,516    5,215    Total 7,811    $ 9,622    $ 6,099    Total 8,387    $ 5,222    $ 8,030    Natural gas: Natural gas: Written options 540    MMBTUs $ —    $ 22    Purchased options 530    MMBTUs $ 21    $ —    Collars 14,277    MMBTUs 186    522    Collars 14,517    MMBTUs 471    150    Swaps 48,956    MMBTUs 30,257    35,497    Swaps 48,779    MMBTUs 35,601    30,197    Total 63,773    $ 30,443    $ 36,041    Total 63,826    $ 36,093    $ 30,347    Total $ 40,065    $ 42,140    Total $ 41,315    $ 38,377
Schedule of net gains (losses) recognized on the Consolidated Statement of Income related to derivatives designated as fair value hedge	The following table presents the net gains (losses) recognized on the Consolidated Statement of Income related to the derivatives designated as fair value hedges for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Gains (losses) recorded in interest expense: Recognized on interest rate swaps $ 951    $ 1,634    $ 2,996    $ 2,854    Recognized on certificates of deposit $ (357)   $ (1,434)   $ (1,719)   $ (2,695)
Schedule of the carrying amount and associated cumulative basis adjustment related to the application of fair value hedge accounting that is included in the carrying amount of the hedged certificates of deposit	The following table presents the carrying amount and associated cumulative basis adjustment related to the application of fair value hedge accounting that is included in the carrying amount of the hedged certificates of deposit as of June 30, 2020 and December 31, 2019: ($ in thousands) Carrying Value (1) Cumulative Fair     Value Adjustment (2) June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Certificates of deposit $ (14,986)   $ (29,080)   $ (114)   $ 1,604    (1)Represents the full carrying amount of the hedged certificates of deposit. (2)For liabilities, (increase) decrease to carrying value.
Schedule of pre-tax changes in AOCI from cash flows hedges	The following table presents the pre-tax changes in AOCI from cash flow hedges for the three and six months ended June 30, 2020 and 2019. The after-tax impact of cash flow hedges on AOCI is shown in Note 14 — Accumulated Other Comprehensive Income (Loss) to the Consolidated Financial Statements in the Form-10-Q. ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Gains (losses) recognized in AOCI $ (1,483)   $ —    $ (1,483)   $ —    Gains (losses) reclassified from AOCI to Interest expense $ 377    $ —    $ 377    $ —
Tabular disclosure of gains and losses on derivative instruments qualified and designated in net investment hedges	The following table presents the after-tax (losses) gains recognized in AOCI on net investment hedges for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Gains (losses) recognized in AOCI $ (377)   $ (598)   $ 627    $ (2,603)
Schedule of the net (losses) gains recognized on the Company’s Consolidated Statement of Income related to derivatives not designated as hedging instruments	The following table presents the net (losses) gains recognized on the Company’s Consolidated Statement of Income related to derivatives not designated as hedging instruments for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Classification on Consolidated Statement of Income Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Derivatives not designated as hedging instruments: Interest rate contracts Interest rate contracts and other derivative income $ (5,361)   $ (1,359)   $ (12,372)   $ (3,138)   Foreign exchange contracts Foreign exchange income 6,201    3,495    9,062    9,821    Credit contracts Interest rate contracts and other derivative income (75)   (36)   (98)   47    Equity contracts Lending fees 8,070    917    8,379    1,167    Commodity contracts Interest rate contracts and other derivative income (71)   (22)   (47)   (18)   Net gains $ 8,764    $ 2,995    $ 4,924    $ 7,879
Schedule of gross derivative fair values, the balance sheet netting adjustments and the resulting net fair values recorded on the consolidated balance sheet, as well as the cash and non-cash collateral associated with master netting arrangements	The following tables present the gross derivative fair values, the balance sheet netting adjustments and the resulting net fair values recorded on the consolidated balance sheet, as well as the cash and noncash collateral associated with master netting arrangements. The gross amounts of derivative assets and liabilities are presented after the application of variation margin payments as settlements with centrally cleared organizations, where applicable. The collateral amounts in the following tables are limited to the outstanding balances of the related asset or liability, after the application of netting; therefore instances of overcollateralization are not shown: ($ in thousands) As of June 30, 2020 Gross Amounts Recognized (1) Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Net Amount Master Netting Arrangements Cash Collateral Received (3) Security Collateral Received (5) Derivative assets $ 764,430    $ (110,569)   $ (11,649)   $ 642,212    $ (13,447)   $ 628,765     Gross Amounts Recognized (2) Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Net Amount Master Netting Arrangements Cash Collateral Pledged (4) Security Collateral Pledged (5) Derivative liabilities $ 560,169    $ (110,569)   $ (94,435)   $ 355,165    $ (279,528)   $ 75,637    ($ in thousands) As of December 31, 2019  Gross Amounts Recognized (1) Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Net Amount Master Netting Arrangements Cash Collateral Received (3) Security Collateral Received (5) Derivative assets $ 330,316    $ (121,561)   $ (3,758)   $ 204,997    $ —    $ 204,997     Gross Amounts Recognized (2) Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts Presented on the Consolidated Balance Sheet Gross Amounts Not Offset on the Consolidated Balance Sheet Net Amount Master Netting Arrangements Cash Collateral Pledged (4) Security Collateral Pledged (5) Derivative liabilities $ 256,528    $ (121,561)   $ (38,238)   $ 96,729    $ (79,619)   $ 17,110    (1)Gross amounts recognized for derivative assets include amounts with counterparties subject to enforceable master netting arrangements or similar agreements of $754.7 million and $328.7 million, respectively, as of June 30, 2020 and December 31, 2019, and amounts with counterparties not subject to enforceable master netting arrangements or similar agreements of $9.7 million and $1.6 million, respectively, as of June 30, 2020 and December 31, 2019. (2)Gross amounts recognized for derivative liabilities include amounts with counterparties subject to enforceable master netting arrangements or similar agreements of $560.0 million and $256.5 million, respectively, as of June 30, 2020 and December 31, 2019, and amounts with counterparties not subject to enforceable master netting arrangements or similar agreements of $211 thousand and $20 thousand, respectively, as of June 30, 2020 and December 31, 2019. (3)Gross cash collateral received under master netting arrangements or similar agreements were $18.1 million and $3.8 million, respectively, as of June 30, 2020 and December 31, 2019. Of the gross cash collateral received, $11.6 million and $3.8 million were used to offset against derivative assets, respectively, as of June 30, 2020 and December 31, 2019. (4)Gross cash collateral pledged under master netting arrangements or similar agreements were $98.9 million and $43.0 million, respectively, as of June 30, 2020 and December 31, 2019. Of the gross cash collateral pledged, $94.4 million and $38.2 million were used to offset against derivative liabilities, respectively, as of June 30, 2020 and December 31, 2019. (5)Represents the fair value of security collateral received and pledged limited to derivative assets and liabilities that are subject to enforceable master netting arrangements or similar agreements. GAAP does not permit the netting of noncash collateral on the consolidated balance sheet but requires disclosure of such amounts.

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- Definition Table shows the carrying amount and associated cumulative basis adjustment related to the application of hedge accounting that is included in the carrying amount of hedged assets and liabilities in fair value hedging relationships. [Table Text Block] + References No definition available. + Details Name: ewbc_HedgedItemsInFairValueHedgingRelationshipTableTextBlock Namespace Prefix: ewbc_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of derivatives that are subject to offsetting, including master netting arrangements. + References No definition available. + Details Name: ewbc_OffsettingDerivativeAssetsAndLiabilitiesTableTextBlock Namespace Prefix: ewbc_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Schedule Of Fair Value Hedge Gain (Loss) In Statement Of Financial Performance [Table Text Block] + References No definition available. + Details Name: ewbc_ScheduleOfFairValueHedgeGainLossInStatementOfFinancialPerformanceTableTextBlock Namespace Prefix: ewbc_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of gain (loss) on derivative and nonderivative instruments designated and qualifying as cash flow hedge recorded in accumulated other comprehensive income (AOCI) and reclassified into earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details Name: us-gaap_ScheduleOfCashFlowHedgesIncludedInAccumulatedOtherComprehensiveIncomeLossTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41620-113959 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41638-113959 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41678-113959 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41641-113959 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579240-113959 + Details Name: us-gaap_ScheduleOfDerivativeInstrumentsTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Loans Receivable and Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2020
Loans and Leases Receivable Disclosure [Abstract]
Schedule of composition of loans held-for-investment	The following table presents the composition of the Company’s loans held-for-investment as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 December 31, 2019 Amortized Cost (1) Non-PCI Loans (1) PCI Loans Total (1) Commercial: C&I $ 13,422,691    $ 12,149,121    $ 1,810    $ 12,150,931    CRE: CRE 10,902,114    10,165,247    113,201    10,278,448    Multifamily residential 3,032,385    2,834,212    22,162    2,856,374    Construction and land 567,716    628,459    40    628,499    Total CRE 14,502,215    13,627,918    135,403    13,763,321    Total commercial 27,924,906    25,777,039    137,213    25,914,252    Consumer: Residential mortgage: Single-family residential 7,660,094    7,028,979    79,611    7,108,590    HELOCs 1,461,951    1,466,736    6,047    1,472,783    Total residential mortgage 9,122,045    8,495,715    85,658    8,581,373    Other consumer 182,461    282,914    —    282,914    Total consumer 9,304,506    8,778,629    85,658    8,864,287    Total loans held-for-investment $ 37,229,412    $ 34,555,668    $ 222,871    $ 34,778,539    Allowance for loan losses (632,071)   (358,287)   —    (358,287)   Loans held-for-investment, net $ 36,597,341    $ 34,197,381    $ 222,871    $ 34,420,252    (1)Includes net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts of $(72.1) million and $(43.2) million as of June 30, 2020 and December 31, 2019, respectively.
Schedule of loans held-for-investment by loan portfolio segments, internal risk ratings and vintage year/non-PCI and PCI loans by portfolio segments	The following table summarizes the Company’s loans held-for-investment as of June 30, 2020, presented by loan portfolio segments, internal risk ratings and vintage year. The vintage year is the year of origination, renewal or major modification. ($ in thousands) June 30, 2020 Revolving Loans Amortized Cost Basis Revolving Loans Converted to Term Loans Amortized Cost Basis Term Loans Total Amortized Cost Basis by Origination Year 2020 2019 2018 2017 2016 Prior Commercial: C&I: Pass $ 2,922,977    $ 2,010,048    $ 818,374    $ 328,471    $ 85,000    $ 380,727    $ 6,007,247    $ 9,830    $ 12,562,674    Special mention 525    80,449    54,144    22,757    150    6,105    251,461    —    415,591    Substandard 8,102    82,574    52,383    7,979    6,313    2,515    283,335    —    443,201    Doubtful —    —    —    —    964    261    —    —    1,225    Total C&I 2,931,604    2,173,071    924,901    359,207    92,427    389,608    6,542,043    9,830    13,422,691    CRE: Pass 1,249,819    2,859,844    2,410,797    1,380,086    794,228    1,722,081    170,556    10,716    10,598,127    Special mention 13,072    —    49,860    22,468    1,611    45,309    —    —    132,320    Substandard 8,303    51,944    7,711    43,914    17,213    42,582    —    —    171,667    Total CRE 1,271,194    2,911,788    2,468,368    1,446,468    813,052    1,809,972    170,556    10,716    10,902,114    Multifamily residential: Pass 489,855    1,045,053    507,413    414,771    181,265    357,680    5,809    —    3,001,846    Special mention —    20,433    —    —    262    1,228    —    —    21,923    Substandard —    744    2,150    —    —    5,722    —    —    8,616    Total multifamily residential 489,855    1,066,230    509,563    414,771    181,527    364,630    5,809    —    3,032,385    Construction and land: Pass 46,378    283,670    185,570    5,982    21,636    1,170    —    —    544,406    Substandard 3,618    —    —    —    —    19,692    —    —    23,310    Total construction and land 49,996    283,670    185,570    5,982    21,636    20,862    —    —    567,716    Total CRE 1,811,045    4,261,688    3,163,501    1,867,221    1,016,215    2,195,464    176,365    10,716    14,502,215    Total commercial 4,742,649    6,434,759    4,088,402    2,226,428    1,108,642    2,585,072    6,718,408    20,546    27,924,906    Consumer: Single-family residential: Pass 1,150,786    1,987,025    1,694,022    1,162,434    593,501    1,047,965    —    —    7,635,733    Special mention —    637    1,601    836    305    1,834    —    —    5,213    Substandard —    1,393    3,256    3,382    1,349    9,768    —    —    19,148    Total single-family residential mortgage 1,150,786    1,989,055    1,698,879    1,166,652    595,155    1,059,567    —    —    7,660,094    HELOCs: Pass 185    836    4,417    7,949    7,511    18,097    1,239,458    168,658    1,447,111    Special mention —    —    200    —    —    380    2    190    772    Substandard —    151    788    4,632    1,308    4,038    —    3,151    14,068    Total HELOCs 185    987    5,405    12,581    8,819    22,515    1,239,460    171,999    1,461,951    Total residential mortgage 1,150,971    1,990,042    1,704,284    1,179,233    603,974    1,082,082    1,239,460    171,999    9,122,045    Other consumer: Pass 3,236    4,272    3,358    1,838    —    131,825    35,372    —    179,901    Special mention 51    —    —    —    —    —    —    —    51    Substandard 2    —    —    2,491    —    3    13    —    2,509    Total other consumer 3,289    4,272    3,358    4,329    —    131,828    35,385    —    182,461    Total consumer 1,154,260    1,994,314    1,707,642    1,183,562    603,974    1,213,910    1,274,845    171,999    9,304,506    Total $ 5,896,909    $ 8,429,073    $ 5,796,044    $ 3,409,990    $ 1,712,616    $ 3,798,982    $ 7,993,253    $ 192,545    $ 37,229,412    The following tables present the credit risk ratings for non-PCI and PCI loans by portfolio segments as of December 31, 2019: ($ in thousands) December 31, 2019 Pass Special Mention Substandard Doubtful Total Non-PCI Loans Commercial: C&I $ 11,423,094    $ 406,543    $ 302,509    $ 16,975    $ 12,149,121    CRE: CRE 10,003,749    83,683    77,815    —    10,165,247    Multifamily residential 2,806,475    20,406    7,331    —    2,834,212    Construction and land 603,447    —    25,012    —    628,459    Total CRE 13,413,671    104,089    110,158    —    13,627,918    Total commercial 24,836,765    510,632    412,667    16,975    25,777,039    Consumer: Residential mortgage: Single-family residential 7,012,522    2,278    14,179    —    7,028,979    HELOCs 1,453,207    2,787    10,742    —    1,466,736    Total residential mortgage 8,465,729    5,065    24,921    —    8,495,715    Other consumer 280,392    5    2,517    —    282,914    Total consumer 8,746,121    5,070    27,438    —    8,778,629    Total $ 33,582,886    $ 515,702    $ 440,105    $ 16,975    $ 34,555,668    ($ in thousands) December 31, 2019 Pass Special Mention Substandard Doubtful Total PCI Loans Commercial: C&I $ 1,810    $ —    $ —    $ —    $ 1,810    CRE: CRE 102,257    —    10,944    —    113,201    Multifamily residential 22,162    —    —    —    22,162    Construction and land 40    —    —    —    40    Total CRE 124,459    —    10,944    —    135,403    Total commercial 126,269    —    10,944    —    137,213    Consumer: Residential mortgage: Single-family residential 79,517    —    94    —    79,611    HELOCs 5,849    —    198    —    6,047    Total residential mortgage 85,366    —    292    —    85,658    Total consumer 85,366    —    292    —    85,658    Total (1) $ 211,635    $ —    $ 11,236    $ —    $ 222,871    (1)Loans net of ASC 310-10 discount.
Schedule of aging analysis of loans	The following table presents the aging analysis of total loans held-for-investment as of June 30, 2020: ($ in thousands) June 30, 2020 Current Accruing Loans Accruing Loans 30-59  Days Past Due Accruing Loans 60-89  Days Past Due Total Accruing Past Due Loans Nonaccrual Loans Less Than 90  Days Past Due Nonaccrual Loans 90 or More Days  Past Due Total Nonaccrual Loans Total Loans Commercial: C&I $ 13,277,732    $ 46,774    $ 13,362    $ 60,136    $ 54,555    $ 30,268    $ 84,823    $ 13,422,691    CRE: CRE 10,836,810    7,452    1,275    8,727    1,210    55,367    56,577    10,902,114    Multifamily residential 3,025,648    3,655    2,308    5,963    774    —    774    3,032,385    Construction and land 567,716    —    —    —    —    —    —    567,716    Total CRE 14,430,174    11,107    3,583    14,690    1,984    55,367    57,351    14,502,215    Total commercial 27,707,906    57,881    16,945    74,826    56,539    85,635    142,174    27,924,906    Consumer: Residential mortgage: Single-family residential 7,619,333    15,739    4,952    20,691    1,713    18,357    20,070    7,660,094    HELOCs 1,444,945    2,165    773    2,938    443    13,625    14,068    1,461,951    Total residential mortgage 9,064,278    17,904    5,725    23,629    2,156    31,982    34,138    9,122,045    Other consumer 165,258    14,636    59    14,695    —    2,508    2,508    182,461    Total consumer 9,229,536    32,540    5,784    38,324    2,156    34,490    36,646    9,304,506    Total $ 36,937,442    $ 90,421    $ 22,729    $ 113,150    $ 58,695    $ 120,125    $ 178,820    $ 37,229,412    The following table presents the aging analysis of non-PCI loans as of December 31, 2019: ($ in thousands) December 31, 2019 Current Accruing Loans Accruing Loans 30-59 Days Past Due Accruing Loans 60-89 Days Past Due Total Accruing Past Due Loans Nonaccrual Loans Less Than 90  Days Past Due Nonaccrual Loans 90 or More Days  Past Due Total Nonaccrual Loans Total Non-PCI Loans Commercial: C&I $ 12,026,131    $ 31,121    $ 17,034    $ 48,155    $ 31,084    $ 43,751    $ 74,835    $ 12,149,121    CRE: CRE 10,123,999    22,830    1,977    24,807    540    15,901    16,441    10,165,247    Multifamily residential 2,832,664    198    531    729    534    285    819    2,834,212    Construction and land 628,459    —    —    —    —    —    —    628,459    Total CRE 13,585,122    23,028    2,508    25,536    1,074    16,186    17,260    13,627,918    Total commercial 25,611,253    54,149    19,542    73,691    32,158    59,937    92,095    25,777,039    Consumer: Residential mortgage: Single-family residential 6,993,597    15,443    5,074    20,517    1,964    12,901    14,865    7,028,979    HELOCs 1,448,930    4,273    2,791    7,064    1,448    9,294    10,742    1,466,736    Total residential mortgage 8,442,527    19,716    7,865    27,581    3,412    22,195    25,607    8,495,715    Other consumer 280,386    6    5    11    —    2,517    2,517    282,914    Total consumer 8,722,913    19,722    7,870    27,592    3,412    24,712    28,124    8,778,629    Total $ 34,334,166    $ 73,871    $ 27,412    $ 101,283    $ 35,570    $ 84,649    $ 120,219    $ 34,555,668
Schedule of amortized cost of loans on nonaccrual status with no related allowance for loan losses	The following table presents amortized cost of loans on nonaccrual status for which there was no related allowance for loan losses as of June 30, 2020: ($ in thousands) June 30, 2020 Commercial: C&I $ 66,109    CRE: CRE 54,879    Total CRE 54,879    Total commercial 120,988    Consumer: Residential mortgage: Single-family residential 8,642    HELOCs 8,898    Total residential mortgage 17,540    Other consumer 2,491    Total consumer 20,031    Total nonaccrual loans with no related allowance for loan losses $ 141,019
Summary of additions and modifications to troubled debt restructurings	The following tables present the additions to TDRs for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Loans Modified as TDRs During the Three Months Ended June 30, 2020 2019 Number of Loans Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded    Investment (1) Financial Impact (2) Number of Loans Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded    Investment (1) Financial    Impact (2) Commercial: C&I 3 $ 35,260    $ 28,926    $ 872    6 $ 48,099    $ 48,054    $ 5,869    Total commercial 3 35,260    28,926    872    6 48,099    48,054    5,869    Consumer: Residential mortgage: Single-family residential — —    —    —    1 220    219    —    Total residential mortgage — —    —    —    1 220    219    —    Total consumer — —    —    —    1 220    219    —    Total 3 $ 35,260    $ 28,926    $ 872    7 $ 48,319    $ 48,273    $ 5,869    ($ in thousands) Loans Modified as TDRs During the Six Months Ended June 30, 2020 2019 Number of Loans Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded    Investment (1) Financial    Impact (2) Number of Loans Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded    Investment (1) Financial    Impact (2) Commercial: C&I 6 $ 51,708    $ 43,833    $ 1,000    9 $ 77,250    $ 77,486    $ 5,929    Total commercial 6 51,708    43,833    1,000    9 77,250    77,486    5,929    Consumer: Residential mortgage: Single-family residential — —    —    —    1 220    219    —    Total residential mortgage — —    —    —    1 220    219    —    Total consumer — —    —    —    1 220    219    —    Total 6 $ 51,708    $ 43,833    $ 1,000    10 $ 77,470    $ 77,705    $ 5,929    (1)Includes subsequent payments after modification and reflects the balance as of June 30, 2020 and 2019. (2)The financial impact includes charge-offs and specific reserves recorded since the modification date. The following tables present the TDR post-modification outstanding balances for the three and six months ended June 30, 2020 and 2019 by modification type: ($ in thousands) Modification Type During the Three Months Ended June 30, 2020 2019 Principal (1) Interest Deferments Total Principal (1) Other (2) Total Commercial: C&I $ 11,766    $ 17,160    $ 28,926    $ 9,909    $ 38,145    $ 48,054    Total commercial 11,766    17,160    28,926    9,909    38,145    48,054    Consumer: Residential mortgage: Single-family residential —    —    —    —    219    219    Total residential mortgage —    —    —    —    219    219    Total consumer —    —    —    —    219    219    Total $ 11,766    $ 17,160    $ 28,926    $ 9,909    $ 38,364    $ 48,273    ($ in thousands) Modification Type During the Six Months Ended June 30, 2020 2019 Principal (1) Principal   and Interest (3) Interest Deferments Total Principal (1) Other (2) Total Commercial: C&I $ 15,898    $ 10,775    $ 17,160    $ 43,833    $ 39,341    $ 38,145    $ 77,486    Total commercial 15,898    10,775    17,160    43,833    39,341    38,145    77,486    Consumer: Residential mortgage: Single-family residential —    —    —    —    —    219    219    Total residential mortgage —    —    —    —    —    219    219    Total consumer —    —    —    —    —    219    219    Total $ 15,898    $ 10,775    $ 17,160    $ 43,833    $ 39,341    $ 38,364    $ 77,705    (1)Includes forbearance payments, term extensions and principal deferments that modify the terms of the loan from principal and interest payments to interest payments only. (2)Includes funding to secure additional collateral and provides liquidity to collateral-dependent C&I loans. (3)Includes principal and interest deferments or reductions.
Summary of TDR loans subsequently defaulted	The following tables present information on loans for which a subsequent payment default occurred during the three and six months ended June 30, 2020 and 2019, respectively, which had been modified as TDR within the previous 12 months of its default, and were still in default as of June 30, 2020 and 2019: ($ in thousands) Loans Modified as TDRs that Subsequently Defaulted During the Three Months Ended June 30, 2020 2019 Number of Loans Recorded Investment Number of Loans Recorded Investment Commercial: C&I 1    $ 17,160    $ 1    $ 1,484    Total commercial 1    17,160    1    1,484    Total 1    $ 17,160    $ 1    $ 1,484    ($ in thousands) Loans Modified as TDRs that Subsequently Defaulted During the Six Months Ended June 30, 2020 2019 Number of Loans Recorded Investment Number of Loans Recorded Investment Commercial: C&I 1    $ 17,160    $ 1    $ 1,484    Total commercial 1    17,160    1    1,484    Total 1    $ 17,160    $ 1    $ 1,484
Summary of non-PCI impaired loans	The following table presents information on non-PCI impaired loans as of December 31, 2019: ($ in thousands) December 31, 2019 Unpaid Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance Commercial: C&I $ 174,656    $ 73,956    $ 40,086    $ 114,042    $ 2,881    CRE: CRE 27,601    20,098    1,520    21,618    97    Multifamily residential 4,965    1,371    3,093    4,464    55    Construction and land 19,696    19,691    —    19,691    —    Total CRE 52,262    41,160    4,613    45,773    152    Total commercial 226,918    115,116    44,699    159,815    3,033    Consumer: Residential mortgage: Single-family residential 23,626    8,507    13,704    22,211    35    HELOCs 13,711    6,125    7,449    13,574    8    Total residential mortgage 37,337    14,632    21,153    35,785    43    Other consumer 2,517    —    2,517    2,517    2,517    Total consumer 39,854    14,632    23,670    38,302    2,560    Total non-PCI impaired loans $ 266,772    $ 129,748    $ 68,369    $ 198,117    $ 5,593
Schedule of average recorded investment and interest income recognized on non-PCI impaired loans	The following table presents the average recorded investment and interest income recognized on non-PCI impaired loans for the three and six months ended June 30, 2019: ($ in thousands) Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Average Recorded Investment Recognized Interest    Income (1) Average Recorded Investment Recognized Interest    Income (1) Commercial: C&I $ 182,689    $ 1,081    $ 189,553    $ 1,816    CRE: CRE 29,241    135    31,456    249    Multifamily residential 5,852    61    5,883    121    Total CRE 35,093    196    37,339    370    Total commercial 217,782    1,277    226,892    2,186    Consumer: Residential mortgage: Single-family residential 23,247    129    24,865    258    HELOCs 13,564    38    15,321    56    Total residential mortgage 36,811    167    40,186    314    Other consumer 2,515    —    2,526    —    Total consumer 39,326    167    42,712    314    Total non-PCI impaired loans $ 257,108    $ 1,444    $ 269,604    $ 2,500    (1)Includes interest income recognized on accruing non-PCI TDRs. Interest payments received on nonaccrual non-PCI loans are reflected as a reduction to principal, not as interest income.
Summary of activities in the allowance for credit losses	The following tables present summaries of activities in the allowance for loan losses by portfolio segment for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, 2020 Commercial Consumer Total C&I CRE Residential Mortgage Other Consumer CRE Multi-Family Residential Construction and Land Single- Family Residential HELOCs Allowance for loan losses, beginning of period $ 362,629    $ 132,819    $ 16,530    $ 11,018    $ 26,822    $ 3,881    $ 3,304    $ 557,003    Provision for (reversal of) credit losses on loans (a) 37,862    43,315    7,908    7,526    (1,667)   205    (849)   94,300    Gross charge-offs (20,378)   (320)   —    —    —    (221)   (30)   (20,949)   Gross recoveries 602    226    620    7    159    2    93    1,709    Total net (charge-offs) recoveries (19,776)   (94)   620    7    159    (219)   63    (19,240)   Foreign currency translation adjustments 8    —    —    —    —    —    —    8    Allowance for loan losses, end of period $ 380,723    $ 176,040    $ 25,058    $ 18,551    $ 25,314    $ 3,867    $ 2,518    $ 632,071    ($ in thousands) Three Months Ended June 30, 2019 Commercial Consumer Total C&I CRE Residential Mortgage Other Consumer CRE Multi-Family Residential Construction and Land Single- Family Residential HELOCs Allowance for loan losses, beginning of period $ 189,757    $ 39,224    $ 19,169    $ 22,349    $ 35,759    $ 7,401    $ 4,235    $ 317,894    Provision for (reversal of) credit losses on loans (a) 26,140    (1,250)   58    173    (3,068)   (1,224)   (98)   20,731    Gross charge-offs (11,745)   —    —    —    —    —    (14)   (11,759)   Gross recoveries 1,713    1,837    53    439    72    —    7    4,121    Total net (charge-offs) recoveries (10,032)   1,837    53    439    72    —    (7)   (7,638)   Foreign currency translation adjustments (362)   —    —    —    —    —    —    (362)   Allowance for loan losses, end of period $ 205,503    $ 39,811    $ 19,280    $ 22,961    $ 32,763    $ 6,177    $ 4,130    $ 330,625    ($ in thousands) Six Months Ended June 30, 2020 Commercial Consumer Total C&I CRE Residential Mortgage Other Consumer CRE Multi-Family Residential Construction and Land Single- Family Residential HELOCs Allowance for loan losses, beginning of period $ 238,376    $ 40,509    $ 22,826    $ 19,404    $ 28,527    $ 5,265    $ 3,380    $ 358,287    Impact of ASU 2016-13 adoption 74,237    72,169    (8,112)   (9,889)   (3,670)   (1,798)   2,221    125,158    Allowance for loan losses, January 1, 2020 312,613    112,678    14,714    9,515    24,857    3,467    5,601    483,445    Provision for (reversal of) credit losses on loans (a) 98,480    54,750    9,189    9,008    33    617    (3,121)   168,956    Gross charge-offs (32,355)   (1,274)   —    —    —    (221)   (56)   (33,906)   Gross recoveries 2,177    9,886    1,155    28    424    4    94    13,768    Total net (charge-offs) recoveries (30,178)   8,612    1,155    28    424    (217)   38    (20,138)   Foreign currency translation adjustments (192)   —    —    —    —    —    —    (192)   Allowance for loan losses, end of period $ 380,723    $ 176,040    $ 25,058    $ 18,551    $ 25,314    $ 3,867    $ 2,518    $ 632,071    ($ in thousands) Six Months Ended June 30, 2019 Commercial Consumer Total C&I CRE Residential Mortgage Other Consumer CRE Multi-Family Residential Construction and Land Single- Family Residential HELOCs Allowance for loan losses, beginning of period $ 189,117    $ 40,666    $ 19,885    $ 20,290    $ 31,340    $ 5,774    $ 4,250    $ 311,322    Provision for (reversal of) credit losses on loans (a) 41,404    (2,914)   (939)   2,169    1,349    401    (99)   41,371    Gross charge-offs (28,989)   —    —    —    —    —    (28)   (29,017)   Gross recoveries 3,964    2,059    334    502    74    2    7    6,942    Total net (charge-offs) recoveries (25,025)   2,059    334    502    74    2    (21)   (22,075)   Foreign currency translation adjustments 7    —    —    —    —    —    —    7    Allowance for loan losses, end of period $ 205,503    $ 39,811    $ 19,280    $ 22,961    $ 32,763    $ 6,177    $ 4,130    $ 330,625    The following table presents a summary of activities in the allowance for unfunded credit commitments for the three and six months ended June 30, 2020 and 2019: Three Months Ended June 30, Six Months Ended June 30, ($ in thousands) 2020 2019 2020 2019 Unfunded credit facilities Allowance for unfunded credit commitments, beginning of period $ 20,829    $ 14,505    $ 11,158    $ 12,566    Impact of ASU 2016-13 adoption —    —    10,457    —    Provision for (reversal of) credit losses on unfunded credit  commitments (b) 8,143    (1,486)   7,357    453    Allowance for unfunded credit commitments, end of period $ 28,972    $ 13,019    $ 28,972    $ 13,019    Provision for credit losses (a) + (b) $ 102,443    $ 19,245    $ 176,313    $ 41,824
Allowance for loan losses and recorded investments by loan type and impairment methodology	The following table presents the Company’s allowance for loan losses and recorded investments by portfolio segments and impairment methodology as of December 31, 2019. This is no longer relevant after December 31, 2019, given the adoption of ASU 2016-13 on January 1, 2020, which has a single impairment methodology: ($ in thousands) December 31, 2019 Commercial Consumer Total C&I CRE Residential Mortgage Other Consumer CRE Multifamily Residential Construction and Land Single- Family Residential HELOCs Allowance for loan losses Individually evaluated for impairment $ 2,881    $ 97    $ 55    $ —    $ 35    $ 8    $ 2,517    $ 5,593    Collectively evaluated for impairment 235,495    40,412    22,771    19,404    28,492    5,257    863    352,694    Acquired with deteriorated credit quality —    —    —    —    —    —    —    —    Total $ 238,376    $ 40,509    $ 22,826    $ 19,404    $ 28,527    $ 5,265    $ 3,380    $ 358,287    Recorded investment in loans Individually evaluated for impairment $ 114,042    $ 21,618    $ 4,464    $ 19,691    $ 22,211    $ 13,574    $ 2,517    $ 198,117    Collectively evaluated for impairment 12,035,079    10,143,629    2,829,748    608,768    7,006,768    1,453,162    280,397    34,357,551    Acquired with deteriorated credit quality (1) 1,810    113,201    22,162    40    79,611    6,047    —    222,871    Total (1) $ 12,150,931    $ 10,278,448    $ 2,856,374    $ 628,499    $ 7,108,590    $ 1,472,783    $ 282,914    $ 34,778,539    (1)Loans net of ASC 310-10 discount.
Summary of changes in accretable yield on PCI loans	The following table presents the changes in accretable yield on PCI loans for the three and six months ended June 30, 2019: ($ in thousands) Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Accretable yield for PCI loans, beginning of period $ 68,861    $ 74,870    Accretion (5,806)   (12,007)   Changes in expected cash flows 998    1,190    Accretable yield for PCI loans, end of period $ 64,053    $ 64,053
Schedule of carrying value of loans purchased for the held-for-investment portfolio, loans sold and loans transferred from held-for-investment to held-for-sale at lower of cost or fair value	The following tables provide information about the carrying value of loans purchased for the held-for-investment portfolio, loans sold and loans transferred from held-for-investment to held-for-sale at lower of cost or fair value during the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, 2020 Commercial Consumer Total C&I CRE Residential Mortgage CRE Multifamily Residential Construction and Land Single-Family Residential Loans transferred from held-for-investment to held-for-sale (1) $ 33,060    $ —    $ —    $ —    $ —    $ 33,060    Sales (2)(3)(4) $ 33,060    $ —    $ —    $ —    $ 13,708    $ 46,768    Purchases (5) $ 12,503    $ —    $ 7    $ —    $ —    $ 12,510    ($ in thousands) Three Months Ended June 30, 2019 Commercial Consumer Total C&I CRE Residential Mortgage CRE Multifamily Residential Construction and Land Single-Family Residential Loans transferred from held-for-investment to held-for-sale (1) $ 79,593    $ —    $ —    $ 1,573    $ —    $ 81,166    Sales (2)(3)(4) $ 76,031    $ —    $ —    $ 1,573    $ 1,172    $ 78,776    Purchases (5) $ 159,100    $ —    $ 1,734    $ —    $ 17,637    $ 178,471    ($ in thousands) Six Months Ended June 30, 2020 Commercial Consumer Total C&I CRE Residential Mortgage CRE Multifamily Residential Construction and Land Single-Family Residential Loans transferred from held-for-investment to held-for-sale (1) $ 136,033    $ 7,250    $ —    $ —    $ —    $ 143,283    Sales (2)(3)(4) $ 136,033    $ 7,250    $ —    $ —    $ 18,350    $ 161,633    Purchases (5) $ 143,086    $ —    $ 1,520    $ —    $ 1,084    $ 145,690    ($ in thousands) Six Months Ended June 30, 2019 Commercial Consumer Total C&I CRE Residential Mortgage CRE Multifamily Residential Construction and Land Single-Family Residential Loans transferred from held-for-investment to held-for-sale (1) $ 155,166    $ 16,655    $ —    $ 1,573    $ —    $ 173,394    Sales (2)(3)(4) $ 151,677    $ 16,655    $ —    $ 1,573    $ 3,614    $ 173,519    Purchases (5) $ 266,294    $ —    $ 5,952    $ —    $ 54,039    $ 326,285    (1)The Company recorded no write-downs to the allowance for loan losses related to loans transferred from held-for-investment to held-for-sale for both the three and six months ended June 30, 2020 and $317 thousand and $390 thousand for the same periods in 2019, respectively. (2)Includes originated loans sold of $46.8 million and $161.6 million for the three and six months ended June 30, 2020, respectively, and $55.7 million and $132.2 million for the same periods in 2019, respectively. Originated loans sold were primarily C&I and single-family residential loans during the three and six months ended June 30, 2020. In comparison, originated loans sold were primarily C&I loans for the same periods in 2019. (3)Includes none of the purchased loans sold in the secondary market for both the three and six months ended June 30, 2020 and $23.1 million and $41.3 million for the same periods in 2019, respectively. (4)Net gains on sales of loans were $132 thousand and $1.1 million for the three and six months ended June 30, 2020, respectively, and $15 thousand and $930 thousand for the same periods in 2019, respectively. (5)C&I loan purchases for each of the three and six months ended June 30, 2020 and 2019 were comprised primarily of syndicated C&I term loans.

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- Definition Tabular disclosure of the changes in the accretable yield for loans acquired with evidence of credit deterioration. + References No definition available. + Details Name: ewbc_ChangesInAccretableYieldForPurchasedCreditImpairedLoansTableTextBlock Namespace Prefix: ewbc_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of impaired financing receivables average recorded investment and interest income. + References No definition available. + Details Name: ewbc_ImpairedFinancingReceivablesAverageRecordedInvestmentAndInterestIncomeTableTextBlock Namespace Prefix: ewbc_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Loans Receivable And Allowance By Portfolio Segment By Impairment Methodology [Table Text Block] + References No definition available. + Details Name: ewbc_LoansReceivableAndAllowanceByPortfolioSegmentByImpairmentMethodologyTableTextBlock Namespace Prefix: ewbc_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Schedule Of Financing Receivables, Carrying Amount [Table Text Block] + References No definition available. + Details Name: ewbc_ScheduleOfFinancingReceivablesCarryingAmountTableTextBlock Namespace Prefix: ewbc_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Schedule Of Sales, Purchases And Securitization Of Loans, And Reclassification Of Loans Held-For-Investment To (From) Loans Held-For-Sale [Table Text Block] + References No definition available. + Details Name: ewbc_ScheduleOfSalesPurchasesAndSecuritizationOfLoansAndReclassificationOfLoansHeldForInvestmentToFromLoansHeldForSaleTableTextBlock Namespace Prefix: ewbc_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Troubled Debt Restructurings on Financing Receivables, Defaulted [Table Text Block] + References No definition available. + Details Name: ewbc_TroubledDebtRestructuringsonFinancingReceivablesDefaultedTableTextBlock Namespace Prefix: ewbc_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details Name: us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953659-111524 + Details Name: us-gaap_FinancingReceivableCreditQualityIndicatorsTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of impaired financing receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 + Details Name: us-gaap_ImpairedFinancingReceivablesTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- References No definition available. + Details Name: us-gaap_LoansAndLeasesReceivableDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of aging analysis for financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919253-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953401-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524 + Details Name: us-gaap_PastDueFinancingReceivablesTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of financing receivable on nonaccrual status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 + Details Name: us-gaap_ScheduleOfFinancingReceivablesNonAccrualStatusTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524 + Details Name: us-gaap_TroubledDebtRestructuringsOnFinancingReceivablesTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2020
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities [Abstract]
Schedule of investments in qualified affordable housing partnerships, net and related unfunded commitments	The following table presents the Company’s investments in qualified affordable housing partnerships, net, and related unfunded commitments as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 December 31, 2019 Investments in qualified affordable housing partnerships, net $ 201,888    $ 207,037    Accrued expenses and other liabilities — Unfunded commitments $ 72,655    $ 80,294
Schedule of additional information related to investments in qualified affordable housing partnerships, net	The following table presents additional information related to the Company’s investments in qualified affordable housing partnerships, net, for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Tax credits and other tax benefits recognized $ 11,772    $ 11,506    $ 22,803    $ 23,332    Amortization expense included in income tax expense $ 9,148    $ 9,657    $ 17,532    $ 18,554
Schedule of investment in tax credit and other investments, net and related unfunded commitments	The following table presents the Company’s investments in tax credit and other investments, net, and related unfunded commitments as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 December 31, 2019 Investments in tax credit and other investments, net $ 251,318    $ 254,140    Accrued expenses and other liabilities — Unfunded commitments $ 106,969    $ 113,515

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- Definition Investments in Qualified Affordable Housing Partnerships, Net [Abstract] + References No definition available. + Details Name: ewbc_InvestmentsInQualifiedAffordableHousingPartnershipsTaxCreditAndOtherInvestmentsNetAndVariableInterestEntitiesAbstract Namespace Prefix: ewbc_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of qualified affordable housing project investments and related unfunded commitments. + References No definition available. + Details Name: ewbc_ScheduleOfAffordableHousingInvestmentsAndUnfundedCommitmentsTableTextBlock Namespace Prefix: ewbc_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of the income statement impact from investments in qualified affordable housing partnerships, including amortization expense and recognition of tax credits and other tax benefits. + References No definition available. + Details Name: ewbc_ScheduleOfAffordableHousingInvestmentsIncomeStatementImpactTableTextBlock Namespace Prefix: ewbc_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Schedule of Tax Credits and Other Investments and Unfunded Commitments [Table Text Block] + References No definition available. + Details Name: ewbc_ScheduleofTaxCreditsandOtherInvestmentsandUnfundedCommitmentsTableTextBlock Namespace Prefix: ewbc_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of changes in the carrying amount of goodwill by reporting unit	The following table presents changes in the carrying amount of goodwill by reporting unit during the six months ended June 30, 2019: ($ in thousands) Consumer and Business Banking Commercial Banking Total Beginning balance, January 1, 2019 $ 353,321    $ 112,226    $ 465,547    Acquisition of East West Capital Markets, LLC —    150    150    Ending balance, June 30, 2019 $ 353,321    $ 112,376    $ 465,697
Schedule of gross carrying amount of core deposit intangible assets and accumulated amortization	The following table presents the gross carrying amount of core deposit intangible assets and accumulated amortization as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 December 31, 2019 Gross balance (1) $ 86,099    $ 86,099    Accumulated amortization (1) (77,972)   (76,088)   Net carrying balance (1) $ 8,127    $ 10,011    (1)Excludes fully amortized core deposit intangible assets.
Schedule of estimated future amortization expense of core deposit intangibles	The following table presents the estimated future amortization expense of core deposit intangibles as of June 30, 2020: ($ in thousands) Amount Remainder of 2020 $ 1,750    2021 2,749    2022 1,865    2023 1,199    2024 553    Thereafter 11    Total $ 8,127

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- References No definition available. + Details Name: us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details Name: us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details Name: us-gaap_ScheduleOfGoodwillTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of credit-related commitments	The following table presents the Company’s credit-related commitments as of June 30, 2020 and December 31, 2019: ($ in thousands) June 30, 2020 December 31, 2019 Loan commitments $ 5,131,120    $ 5,330,211    Commercial letters of credit and SBLCs $ 2,005,402    $ 1,860,414
Schedule of guarantees outstanding	The following table presents the types of guarantees the Company had outstanding as of June 30, 2020 and December 31, 2019: ($ in thousands) Maximum Potential Future Payments Carrying Value June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 Single-family residential loans sold or securitized with recourse $ 11,501    $ 12,578    $ 11,501    $ 12,578    Multifamily residential loans sold or securitized with recourse 15,682    15,892    30,152    40,708    Total $ 27,183    $ 28,470    $ 41,653    $ 53,286

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- Definition Tabular disclosure of outstanding commitments to extend credit that are not reflected in the consolidated financial statements. + References No definition available. + Details Name: ewbc_ScheduleOfUnfundedCommitmentsAndCreditExposuresTableTextBlock Namespace Prefix: ewbc_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- References No definition available. + Details Name: us-gaap_CommitmentsAndContingenciesDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of each guarantee obligation, or each group of similar guarantee obligations, including (a) the nature of the guarantee, including its term, how it arose, and the events or circumstances that would require the guarantor to perform under the guarantee; (b) the maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee; (c) the current carrying amount of the liability, if any, for the guarantor's obligations under the guarantee; and (d) the nature of any recourse provisions under the guarantee, and any assets held either as collateral or by third parties, and any relevant related party disclosure. Excludes disclosures about product warranties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12265-110248 + Details Name: us-gaap_ScheduleOfGuaranteeObligationsTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables present revenue from contracts with customers within the scope of ASC 606, Revenue from Contracts with Customers, and other noninterest income, segregated by operating segments for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, 2020 Consumer and Business Banking Commercial Banking Other Total Noninterest income: Revenue from contracts with customers: Deposit account fees: Deposit service charges and related fee income $ 6,166    $ 3,904    $ 41    $ 10,111    Card income 639    122    —    761    Wealth management fees 2,691    400    —    3,091    Total revenue from contracts with customers $ 9,496    $ 4,426    $ 41    $ 13,963    Other sources of noninterest income (1) 4,447    29,461    10,766    44,674    Total noninterest income $ 13,943    $ 33,887    $ 10,807    $ 58,637    ($ in thousands) Three Months Ended June 30, 2019 Consumer and Business Banking Commercial Banking Other Total Noninterest income: Revenue from contracts with customers: Deposit account fees: Deposit service charges and related fee income $ 5,397    $ 3,299    $ 10    $ 8,706    Card income 747    154    —    901    Wealth management fees 3,565    235    —    3,800    Total revenue from contracts with customers $ 9,709    $ 3,688    $ 10    $ 13,407    Other sources of noninterest income (1) 4,794    29,968    4,590    39,352    Total noninterest income $ 14,503    $ 33,656    $ 4,600    $ 52,759    ($ in thousands) Six Months Ended June 30, 2020 Consumer and Business Banking Commercial Banking Other Total Noninterest income: Revenue from contracts with customers: Deposit account fees: Deposit service charges and related fee income $ 11,710    $ 7,703    $ 47    $ 19,460    Card income 1,537    322    —    1,859    Wealth management fees 7,704    740    —    8,444    Total revenue from contracts with customers $ 20,951    $ 8,765    $ 47    $ 29,763    Other sources of noninterest income (1) 9,394    57,578    15,951    82,923    Total noninterest income $ 30,345    $ 66,343    $ 15,998    $ 112,686    ($ in thousands) Six Months Ended June 30, 2019 Consumer and Business Banking Commercial Banking Other Total Noninterest income: Revenue from contracts with customers: Deposit account fees: Deposit service charges and related fee income $ 10,630    $ 6,573    $ 26    $ 17,229    Card income 1,507    339    —    1,846    Wealth management fees 7,233    341    —    7,574    Total revenue from contracts with customers $ 19,370    $ 7,253    $ 26    $ 26,649    Other sources of noninterest income (1) 8,905    50,947    8,389    68,241    Total noninterest income $ 28,275    $ 58,200    $ 8,415    $ 94,890    (1)Primarily represents revenue from contracts with customers that are out of the scope of ASC 606, Revenue from Contracts with Customers.

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details Name: us-gaap_DisaggregationOfRevenueTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- References No definition available. + Details Name: us-gaap_RevenueFromContractWithCustomerAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.20.2

Stock Compensation Plans (Tables)	6 Months Ended
	Jun. 30, 2020
Share-based Payment Arrangement [Abstract]
Summary of stock compensation expense and related net tax benefit	The following table presents a summary of the total share-based compensation expense and the related net tax (deficiencies) benefits associated with the Company’s various employee share-based compensation plans for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Stock compensation costs $ 7,071    $ 8,081    $ 14,280    $ 15,525    Related net tax (deficiencies) benefits for stock compensation plans $ (9)   $ 1    $ (1,575)   $ 4,708
Summary of activity for time-based and performance-based restricted stock units	The following table presents a summary of the activities for the Company’s time-based and performance-based RSUs that will be settled in shares for the six months ended June 30, 2020. The number of outstanding performance-based RSUs stated below assumes the associated performance targets will be met at the target level: Time-Based RSUs Performance-Based RSUs Shares Weighted-Average Grant Date Fair Value Shares Weighted-Average Grant Date Fair Value Outstanding, January 1, 2020 1,139,868    $ 57.78    386,483    $ 60.13    Granted 657,461    40.51    165,084    39.79    Vested (251,526)   54.47    (131,597)   56.59    Forfeited (100,371)   54.33    —    —    Outstanding, June 30, 2020 1,445,432    $ 50.74    419,970    $ 53.24    The following table presents a summary of the activities for the Company’s time-based RSUs that will be settled in cash for the six months ended June 30, 2020: Shares Outstanding, January 1, 2020 11,638    Granted 11,215    Vested (723)   Forfeited —    Outstanding, June 30, 2020 22,130

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- References No definition available. + Details Name: us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details Name: us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details Name: us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Stockholders' Equity and Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2020
Stockholders' Equity and Earnings Per Share [Abstract]
Schedule of earnings per share calculations	The following table presents the basic and diluted EPS calculations for the three and six months ended June 30, 2020 and 2019. For more information on the calculation of EPS, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Earnings Per Share to the Consolidated Financial Statements of the Company’s 2019 Form 10-K. ($ and shares in thousands, except per share data) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Basic: Net income $ 99,352    $ 150,380    $ 244,176    $ 314,404    Basic weighted-average number of shares outstanding 141,486    145,546    143,150    145,402    Basic EPS $ 0.70    $ 1.03    $ 1.71    $ 2.16    Diluted: Net income $ 99,352    $ 150,380    $ 244,176    $ 314,404    Basic weighted-average number of shares outstanding (1) 141,486    145,546    143,150    145,402    Diluted potential common shares (2) 341    506    410    614    Diluted weighted-average number of shares outstanding (1)(2) 141,827    146,052    143,560    146,016    Diluted EPS $ 0.70    $ 1.03    $ 1.70    $ 2.15    (1)The Company acquired MetroCorp Bancshares, Inc. (“MetroCorp”) on January 17, 2014. Prior to the acquisition, MetroCorp had outstanding warrants to purchase 771,429 shares of its common stock. Upon the acquisition, the rights of the warrant holders were converted into the rights to acquire 230,282 shares of East West’s common stock until January 16, 2019. All warrants were exercised on January 7, 2019. (2)Includes dilutive shares from RSUs for the three and six months ended June 30, 2020 and 2019.

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- Definition Stockholders' Equity and Earnings Per Share [Abstract] + References No definition available. + Details Name: ewbc_StockholdersEquityandEarningsPerShareAbstract Namespace Prefix: ewbc_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details Name: us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Schedule of the changes in components of accumulated other comprehensive income (loss) balances	The following tables present the changes in the components of AOCI balances for the three and six months ended June 30, 2020 and 2019: ($ in thousands) AFS Debt Securities Cash Flow Hedges Foreign Currency Translation Adjustments (1) Total Balance, April 1, 2019 $ (23,810)   $ —    $ (9,173)   $ (32,983)   Net unrealized gains (losses) arising during the period 30,046    —    (6,016)   24,030    Amounts reclassified from AOCI (1,019)   —    —    (1,019)   Changes, net of tax 29,027    —    (6,016)   23,011    Balance, June 30, 2019 $ 5,217    $ —    $ (15,189)   $ (9,972)   Balance, April 1, 2020 $ 25,034    $ —    $ (18,153)   $ 6,881    Net unrealized gains (losses) arising during the period 24,606    (1,063)   (230)   23,313    Amounts reclassified from AOCI (6,790)   (270)   —    (7,060)   Changes, net of tax 17,816    (1,333)   (230)   16,253    Balance, June 30, 2020 $ 42,850    $ (1,333)   $ (18,383)   $ 23,134    ($ in thousands) AFS Debt Securities Cash Flow Hedges Foreign Currency Translation Adjustments (1) Total Balance, January 1, 2019 $ (45,821)   $ —    $ (12,353)   $ (58,174)   Net unrealized gains (losses) arising during the period 53,157    —    (2,836)   50,321    Amounts reclassified from AOCI (2,119)   —    —    (2,119)   Changes, net of tax 51,038    —    (2,836)   48,202    Balance, June 30, 2019 $ 5,217    $ —    $ (15,189)   $ (9,972)   Balance, January 1, 2020 $ (2,419)   $ —    $ (15,989)   $ (18,408)   Net unrealized gains (losses) arising during the period 53,136    (1,063)   (2,394)   49,679    Amounts reclassified from AOCI (7,867)   (270)   —    (8,137)   Changes, net of tax 45,269    (1,333)   (2,394)   41,542    Balance, June 30, 2020 $ 42,850    $ (1,333)   $ (18,383)   $ 23,134    (1)Represents foreign currency translation adjustments related to the Company’s net investment in non-U.S. operations, including related hedges. The functional currency and reporting currency of the Company’s foreign subsidiary was RMB and USD, respectively.
Schedule of components of other comprehensive income (loss), reclassifications to net income and the related tax effects	The following tables present the components of other comprehensive income (loss), reclassifications to net income and the related tax effects for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Three Months Ended June 30, 2020 2019 Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax AFS debt securities: Net unrealized gains arising during the period $ 34,970    $ (10,364)   $ 24,606    $ 44,531    $ (14,485)   $ 30,046    Net realized (gains) reclassified into net income (1) (9,640)   2,850    (6,790)   (1,447)   428    (1,019)   Net change 25,330    (7,514)   17,816    43,084    (14,057)   29,027    Cash flow hedges Net unrealized (losses) arising during the period (1,483)   420    (1,063)   —    —    —    Net realized (gains) reclassified into net income (2) (377)   107    (270)   —    —    —    Net change (1,860)   527    (1,333)   —    —    —    Foreign currency translation adjustments, net of hedges: Net unrealized (losses) arising during the period (379)   149    (230)   (2,989)   (3,027)   (6,016)   Net change (379)   149    (230)   (2,989)   (3,027)   (6,016)   Other comprehensive income (loss) $ 23,091    $ (6,838)   $ 16,253    $ 40,095    $ (17,084)   $ 23,011    ($ in thousands) Six Months Ended June 30, 2020 2019 Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax AFS debt securities: Net unrealized gains arising during the period $ 75,463    $ (22,327)   $ 53,136    $ 75,469    $ (22,312)   $ 53,157    Net realized (gains) reclassified into net income (1) (11,169)   3,302    (7,867)   (3,008)   889    (2,119)   Net change 64,294    (19,025)   45,269    72,461    (21,423)   51,038    Cash flow hedges Net unrealized (losses) arising during the period (1,483)   420    (1,063)   —    —    —    Net realized (gains) reclassified into net income (2) (377)   107    (270)   —    —    —    Net change (1,860)   527    (1,333)   —    —    —    Foreign currency translation adjustments, net of hedges: Net unrealized (losses) arising during the period (2,145)   (249)   (2,394)   191    (3,027)   (2,836)   Net change (2,145)   (249)   (2,394)   191    (3,027)   (2,836)   Other comprehensive income (loss) $ 60,289    $ (18,747)   $ 41,542    $ 72,652    $ (24,450)   $ 48,202    (1)For the three and six months ended June 30, 2020 and 2019, pre-tax amounts were reported in Gains on sales of AFS debt securities on the Consolidated Statement of Income. (2)For the three and six months ended June 30, 2020 and 2019, pre-tax amounts were reported in Interest expense on the Consolidated Statement of Income.

X

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details Name: us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e526-108580 + Details Name: us-gaap_ScheduleOfComprehensiveIncomeLossTableTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

v3.20.2

Business Segments (Tables)	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Schedule of operating results and other key financial measures for the individual operating segments	The following tables present the operating results and other key financial measures for the individual operating segments as of and for the three and six months ended June 30, 2020 and 2019: ($ in thousands) Consumer and Business Banking Commercial Banking Other Total Three Months Ended June 30, 2020 Net interest income before provision for credit losses $ 124,926    $ 183,796    $ 35,053    $ 343,775    Provision for credit losses 5,590    96,853    —    102,443    Noninterest income 13,943    33,887    10,807    58,637    Noninterest expense 80,164    64,900    42,632    187,696    Segment income before income taxes 53,115    55,930    3,228    112,273    Segment net income $ 38,058    $ 40,178    $ 21,116    $ 99,352    As of June 30, 2020 Segment assets $ 12,666,938    $ 26,984,013    $ 9,756,642    $ 49,407,593    ($ in thousands) Consumer and Business Banking Commercial Banking Other Total Three Months Ended June 30, 2019 Net interest income before provision for credit losses $ 180,911    $ 158,941    $ 27,474    $ 367,326    Provision for credit losses 1,616    17,629    —    19,245    Noninterest income 14,503    33,656    4,600    52,759    Noninterest expense 83,656    67,303    26,704    177,663    Segment income before income taxes 110,142    107,665    5,370    223,177    Segment net income (loss) $ 78,741    $ 76,885    $ (5,246)   $ 150,380    As of June 30, 2019 Segment assets $ 11,013,898    $ 25,001,894    $ 6,876,566    $ 42,892,358    ($ in thousands) Consumer and Business Banking Commercial Banking Other Total Six Months Ended June 30, 2020 Net interest income before provision for credit losses $ 277,517    $ 367,297    $ 61,668    $ 706,482    Provision for credit losses 13,378    162,935    —    176,313    Noninterest income 30,345    66,343    15,998    112,686    Noninterest expense 167,128    135,026    64,418    366,572    Segment income before income taxes 127,356    135,679    13,248    276,283    Segment net income $ 91,253    $ 97,309    $ 55,614    $ 244,176    As of June 30, 2020 Segment assets $ 12,666,938    $ 26,984,013    $ 9,756,642    $ 49,407,593    ($ in thousands) Consumer and Business Banking Commercial Banking Other Total Six Months Ended June 30, 2019 Net interest income before provision for credit losses $ 365,970    $ 311,649    $ 52,168    $ 729,787    Provision for credit losses 4,629    37,195    —    41,824    Noninterest income 28,275    58,200    8,415    94,890    Noninterest expense 171,562    137,847    55,176    364,585    Segment income before income taxes 218,054    194,807    5,407    418,268    Segment net income $ 155,887    $ 139,219    $ 19,298    $ 314,404    As of June 30, 2019 Segment assets $ 11,013,898    $ 25,001,894    $ 6,876,566    $ 42,892,358

X

- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 + Details Name: us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock Namespace Prefix: us-gaap_ Data Type: nonnum:textBlockItemType Balance Type: na Period Type: duration

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v3.20.2

Basis of Presentation (Details)	Jun. 30, 2020 trust
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of wholly-owned subsidiaries that are statutory business trusts (the Trusts)	6

X

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v3.20.2

Current Accounting Developments and Summary of Significant Accounting Policies (Details) $ in Thousands	1 Months Ended	6 Months Ended
	Apr. 30, 2020	Jun. 30, 2020 USD ($) loan	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		$ 632,071		$ 358,287
Retained earnings		3,755,649		$ 3,689,377
Commercial and industrial (“C&I”)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses		$ 756
Commercial and industrial (“C&I”) | CARES Act, Paycheck Protection Program
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest rate	1.00%
Number of loans funded | loan		7,200
Outstanding loan balance		$ 1,750,000
Term of loan		2 years
ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			$ 125,200
Retained earnings			98,000
ASU 2016-13 | Unfunded Credit Commitments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for loan losses			$ 10,500

X

- Definition Financing Receivable, Amount of Loans Authorized, Outstanding Balance + References No definition available. + Details Name: ewbc_FinancingReceivableAmountOfLoansAuthorizedOutstandingBalance Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Financing Receivable, Interest Rate + References No definition available. + Details Name: ewbc_FinancingReceivableInterestRate Namespace Prefix: ewbc_ Data Type: num:percentItemType Balance Type: na Period Type: duration

X

- Definition Financing Receivable, Number of Loans Authorized + References No definition available. + Details Name: ewbc_FinancingReceivableNumberOfLoansAuthorized Namespace Prefix: ewbc_ Data Type: xbrli:integerItemType Balance Type: na Period Type: instant

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- Definition Financing Receivable, Term of Loan + References No definition available. + Details Name: ewbc_FinancingReceivableTermOfLoan Namespace Prefix: ewbc_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLosses Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(i) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 + Details Name: us-gaap_RetainedEarningsAccumulatedDeficit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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v3.20.2

Fair Value Measurement and Fair Value of Financial Instruments (Financial Assets and Liabilities Measurement on Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Available-for-sale debt securities
AFS debt securities	$ 3,884,574	$ 3,317,214
Derivative
Derivative assets - Fair value	764,430	330,316
Derivative asset, after netting	642,212	204,997
Derivative liabilities - Fair value	560,169	256,528
Derivative liability, after netting	355,165	96,729
U.S. Treasury securities
Available-for-sale debt securities
AFS debt securities	251,201	176,422
U.S. government agency and U.S. government-sponsored enterprise debt securities
Available-for-sale debt securities
AFS debt securities	442,644	581,245
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	858,440	603,471
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	1,280,895	1,003,897
Municipal securities
Available-for-sale debt securities
AFS debt securities	215,184	102,302
Non-agency commercial mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	151,368	88,550
Non-agency residential mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	114,338	46,548
Corporate debt securities
Available-for-sale debt securities
AFS debt securities	30,826	11,149
Foreign bonds
Available-for-sale debt securities
AFS debt securities	204,080	354,172
Asset-backed securities
Available-for-sale debt securities
AFS debt securities	61,619	64,752
Collateralized loan obligations (“CLOs”)
Available-for-sale debt securities
AFS debt securities	273,979	284,706
Fair Value, Measurements, Recurring
Available-for-sale debt securities
AFS debt securities	3,884,574	3,317,214
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]
Equity securities	31,142	31,673
Total investments in tax credit and other investments	31,142	31,673
Derivative
Derivative assets - Fair value	764,430	330,316
Netting adjustments	(122,218)	(125,319)
Derivative asset, after netting	642,212	204,997
Derivative liabilities - Fair value	560,169	256,528
Netting adjustments	(205,004)	(159,799)
Derivative liability, after netting	355,165	96,729
Fair Value, Measurements, Recurring | Interest rate contracts
Derivative
Derivative assets - Fair value	613,480	192,883
Derivative liabilities - Fair value	401,803	127,317
Fair Value, Measurements, Recurring | Foreign exchange contracts
Derivative
Derivative assets - Fair value	24,289	54,637
Derivative liabilities - Fair value	19,741	48,610
Fair Value, Measurements, Recurring | Credit contracts
Derivative
Derivative assets - Fair value	41	2
Derivative liabilities - Fair value	327	84
Fair Value, Measurements, Recurring | Equity contracts
Derivative
Derivative assets - Fair value	9,173	1,414
Fair Value, Measurements, Recurring | Commodity contracts
Derivative
Derivative assets - Fair value	117,447	81,380
Derivative liabilities - Fair value	138,298	80,517
Fair Value, Measurements, Recurring | U.S. Treasury securities
Available-for-sale debt securities
AFS debt securities	251,201	176,422
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise debt securities
Available-for-sale debt securities
AFS debt securities	442,644	581,245
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	858,440	603,471
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	1,280,895	1,003,897
Fair Value, Measurements, Recurring | Municipal securities
Available-for-sale debt securities
AFS debt securities	215,184	102,302
Fair Value, Measurements, Recurring | Non-agency commercial mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	151,368	88,550
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	114,338	46,548
Fair Value, Measurements, Recurring | Corporate debt securities
Available-for-sale debt securities
AFS debt securities	30,826	11,149
Fair Value, Measurements, Recurring | Foreign bonds
Available-for-sale debt securities
AFS debt securities	204,080	354,172
Fair Value, Measurements, Recurring | Asset-backed securities
Available-for-sale debt securities
AFS debt securities	61,619	64,752
Fair Value, Measurements, Recurring | Collateralized loan obligations (“CLOs”)
Available-for-sale debt securities
AFS debt securities	273,979	284,706
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Available-for-sale debt securities
AFS debt securities	251,201	176,422
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]
Equity securities	22,462	21,746
Total investments in tax credit and other investments	22,462	21,746
Derivative
Derivative assets - Fair value	0	0
Netting adjustments	0	0
Derivative asset, after netting	0	0
Derivative liabilities - Fair value	0	0
Netting adjustments	0	0
Derivative liability, after netting	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign exchange contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Credit contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity contracts
Derivative
Derivative assets - Fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities
Available-for-sale debt securities
AFS debt securities	251,201	176,422
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government agency and U.S. government-sponsored enterprise debt securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-agency commercial mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-agency residential mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign bonds
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized loan obligations (“CLOs”)
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Available-for-sale debt securities
AFS debt securities	3,633,373	3,140,792
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]
Equity securities	8,680	9,927
Total investments in tax credit and other investments	8,680	9,927
Derivative
Derivative assets - Fair value	764,114	329,895
Netting adjustments	(122,218)	(125,319)
Derivative asset, after netting	641,896	204,576
Derivative liabilities - Fair value	560,169	256,528
Netting adjustments	(205,004)	(159,799)
Derivative liability, after netting	355,165	96,729
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate contracts
Derivative
Derivative assets - Fair value	613,480	192,883
Derivative liabilities - Fair value	401,803	127,317
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts
Derivative
Derivative assets - Fair value	24,289	54,637
Derivative liabilities - Fair value	19,741	48,610
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Credit contracts
Derivative
Derivative assets - Fair value	41	2
Derivative liabilities - Fair value	327	84
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity contracts
Derivative
Derivative assets - Fair value	8,857	993
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commodity contracts
Derivative
Derivative assets - Fair value	117,447	81,380
Derivative liabilities - Fair value	138,298	80,517
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government-sponsored enterprise debt securities
Available-for-sale debt securities
AFS debt securities	442,644	581,245
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	858,440	603,471
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	1,280,895	1,003,897
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities
Available-for-sale debt securities
AFS debt securities	215,184	102,302
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency commercial mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	151,368	88,550
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency residential mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	114,338	46,548
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities
Available-for-sale debt securities
AFS debt securities	30,826	11,149
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign bonds
Available-for-sale debt securities
AFS debt securities	204,080	354,172
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Available-for-sale debt securities
AFS debt securities	61,619	64,752
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Collateralized loan obligations (“CLOs”)
Available-for-sale debt securities
AFS debt securities	273,979	284,706
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Available-for-sale debt securities
AFS debt securities	0	0
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]
Equity securities	0	0
Total investments in tax credit and other investments	0	0
Derivative
Derivative assets - Fair value	316	421
Netting adjustments	0	0
Derivative asset, after netting	316	421
Derivative liabilities - Fair value	0	0
Netting adjustments	0	0
Derivative liability, after netting	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign exchange contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Credit contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity contracts
Derivative
Derivative assets - Fair value	316	421
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commodity contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. government agency and U.S. government-sponsored enterprise debt securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Municipal securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Non-agency commercial mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Non-agency residential mortgage-backed securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign bonds
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Asset-backed securities
Available-for-sale debt securities
AFS debt securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Collateralized loan obligations (“CLOs”)
Available-for-sale debt securities
AFS debt securities	$ 0	$ 0

X

- References No definition available. + Details Name: us-gaap_AvailableForSaleSecuritiesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details Name: us-gaap_AvailableForSaleSecuritiesDebtSecurities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and obligation to return cash collateral under master netting arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226003-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_DerivativeInstrumentDetailAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details Name: us-gaap_DerivativeLiabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and right to receive cash collateral under master netting arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226003-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details Name: us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details Name: us-gaap_EquitySecuritiesFvNi Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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v3.20.2

Fair Value Measurement and Fair Value of Financial Instruments (Reconciliation of Assets and Liabilities Measured on Recurring Basis) (Details) - Equity contracts - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lending fees
Reconciliation of the beginning and ending balances for warrants issued by private companies measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Total unrealized gains (losses) for the period included in earnings	$ 8,000	$ (4)	$ 8,300	$ (235)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Reconciliation of the beginning and ending balances for warrants issued by private companies measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Beginning balance	713	442	421	673
Total gains included in earnings	7,976	769	8,268	538
Issuances	0	28	0	28
Settlements	0	(847)	0	(847)
Transfers out of Level 3	(8,373)	0	(8,373)	0
Ending balance	$ 316	$ 392	$ 316	$ 392

X

- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details Name: us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details Name: us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details Name: us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details Name: us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details Name: us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details Name: us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

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v3.20.2

Fair Value Measurement and Fair Value of Financial Instruments (Quantitative Information for Significant Unobservable Inputs) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Quantitative information
Derivative assets - Fair value	$ 764,430	$ 330,316
Fair Value, Measurements, Recurring
Quantitative information
Derivative assets - Fair value	764,430	330,316
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Quantitative information
Derivative assets - Fair value	316	421
Loans | Fair Value, Measurements, Nonrecurring
Quantitative information
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	109,404
Loans | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Quantitative information
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	109,404
Loans | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring
Quantitative information
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	29,949
Loans | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring
Quantitative information
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	5,658
Loans | Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring
Quantitative information
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	52,345
Loans | Significant Unobservable Inputs (Level 3) | Fair value of collateral, contract value | Fair Value, Measurements, Nonrecurring
Quantitative information
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	21,452
Non-PCI Loans | Fair Value, Measurements, Nonrecurring
Quantitative information
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		49,679
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Quantitative information
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		49,679
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring
Quantitative information
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		27,841
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring
Quantitative information
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		1,014
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Fair value of collateral, contract value | Fair Value, Measurements, Nonrecurring
Quantitative information
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		20,824
OREO | Fair Value, Measurements, Nonrecurring
Quantitative information
Assets, fair value disclosure		125
OREO | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Quantitative information
Assets, fair value disclosure		125
OREO | Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring
Quantitative information
Assets, fair value disclosure		125
Other nonperforming assets | Fair Value, Measurements, Nonrecurring
Quantitative information
Assets, fair value disclosure		1,167
Other nonperforming assets | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Quantitative information
Assets, fair value disclosure		1,167
Other nonperforming assets | Significant Unobservable Inputs (Level 3) | Fair value of collateral, contract value | Fair Value, Measurements, Nonrecurring
Quantitative information
Assets, fair value disclosure		1,167
Investments in tax credit and other investments, net | Fair Value, Measurements, Nonrecurring
Quantitative information
Assets, fair value disclosure	6,216	3,076
Investments in tax credit and other investments, net | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Quantitative information
Assets, fair value disclosure	6,216	3,076
Investments in tax credit and other investments, net | Significant Unobservable Inputs (Level 3) | Individual analysis of each investment, expected future tax benefits and distributions | Fair Value, Measurements, Nonrecurring
Quantitative information
Assets, fair value disclosure	6,216	3,076
Equity contracts | Fair Value, Measurements, Recurring
Quantitative information
Derivative assets - Fair value	9,173	1,414
Equity contracts | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Quantitative information
Derivative assets - Fair value	$ 316	$ 421
Equity volatility | Equity contracts | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model | Fair Value, Measurements, Recurring | Weighted Average
Quantitative information
Measurement input	63.00%	42.00%
Equity volatility | Equity contracts | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model | Fair Value, Measurements, Recurring | Minimum
Quantitative information
Measurement input	58.00%	39.00%
Equity volatility | Equity contracts | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model | Fair Value, Measurements, Recurring | Maximum
Quantitative information
Measurement input	70.00%	44.00%
Liquidity discount | Equity contracts | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Quantitative information
Measurement input	47.00%	47.00%
Liquidity discount | Equity contracts | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Weighted Average
Quantitative information
Measurement input	47.00%	47.00%
Discount | Loans | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Weighted Average
Quantitative information
Individually evaluated loans, measurement input	10.00%
Discount | Loans | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Minimum
Quantitative information
Individually evaluated loans, measurement input	4.00%
Discount | Loans | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Maximum
Quantitative information
Individually evaluated loans, measurement input	15.00%
Discount | Loans | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring | Weighted Average
Quantitative information
Individually evaluated loans, measurement input	19.00%
Discount | Loans | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring | Minimum
Quantitative information
Individually evaluated loans, measurement input	10.00%
Discount | Loans | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring | Maximum
Quantitative information
Individually evaluated loans, measurement input	63.00%
Discount | Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Weighted Average
Quantitative information
Non-PCI impaired loans, measurement input		14.00%
Discount | Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Minimum
Quantitative information
Non-PCI impaired loans, measurement input		4.00%
Discount | Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Maximum
Quantitative information
Non-PCI impaired loans, measurement input		15.00%
Discount | Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring | Weighted Average
Quantitative information
Non-PCI impaired loans, measurement input		19.00%
Discount | Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring | Minimum
Quantitative information
Non-PCI impaired loans, measurement input		8.00%
Discount | Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring | Maximum
Quantitative information
Non-PCI impaired loans, measurement input		20.00%
Selling cost | Loans | Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring
Quantitative information
Individually evaluated loans, measurement input	8.00%
Selling cost | Loans | Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring | Weighted Average
Quantitative information
Individually evaluated loans, measurement input	8.00%
Selling cost | OREO | Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring
Quantitative information
OREO, measurement input		0.08
Selling cost | OREO | Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring | Weighted Average
Quantitative information
OREO, measurement input		0.08
Derivatives not designated as hedging instruments
Quantitative information
Derivative assets - Fair value	$ 764,185	$ 330,316
Derivatives not designated as hedging instruments | Equity contracts
Quantitative information
Derivative assets - Fair value	$ 9,173	$ 1,414

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- Definition Impaired Loans, Fair Value Disclosure + References No definition available. + Details Name: ewbc_ImpairedLoansFairValueDisclosure Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Impaired Loans, Measurement Input + References No definition available. + Details Name: ewbc_ImpairedLoansMeasurementInput Namespace Prefix: ewbc_ Data Type: num:percentItemType Balance Type: na Period Type: instant

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details Name: us-gaap_AssetsFairValueDisclosure Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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v3.20.2

Fair Value Measurement and Fair Value of Financial Instruments (Carrying Amounts of Assets That Were Still Held and Had Fair Value Changes Measured on a Nonrecurring Basis) (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Loans
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	$ 109,404
Loans | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	103,575
Loans | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	5,829
Loans | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	0
Loans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	0
Loans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	0
Loans | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	0
Loans | Significant Other Observable Inputs (Level 2) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	0
Loans | Significant Other Observable Inputs (Level 2) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	0
Loans | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	109,404
Loans | Significant Unobservable Inputs (Level 3) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	103,575
Loans | Significant Unobservable Inputs (Level 3) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	5,829
Loans | Commercial and industrial (“C&I”) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	53,122
Loans | Commercial and industrial (“C&I”) | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	0
Loans | Commercial and industrial (“C&I”) | Significant Other Observable Inputs (Level 2) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	0
Loans | Commercial and industrial (“C&I”) | Significant Unobservable Inputs (Level 3) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	53,122
Loans | Commercial real estate (“CRE”) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	50,453
Loans | Commercial real estate (“CRE”) | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	0
Loans | Commercial real estate (“CRE”) | Significant Other Observable Inputs (Level 2) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	0
Loans | Commercial real estate (“CRE”) | Significant Unobservable Inputs (Level 3) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	50,453
Loans | HELOCs | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	3,338
Loans | HELOCs | Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	0
Loans | HELOCs | Significant Other Observable Inputs (Level 2) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	0
Loans | HELOCs | Significant Unobservable Inputs (Level 3) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	3,338
Loans | Other consumer | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	2,491
Loans | Other consumer | Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	0
Loans | Other consumer | Significant Other Observable Inputs (Level 2) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	0
Loans | Other consumer | Significant Unobservable Inputs (Level 3) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)	2,491
Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		$ 49,679
Non-PCI impaired loans | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		48,307
Non-PCI impaired loans | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		1,372
Non-PCI impaired loans | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		0
Non-PCI impaired loans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		0
Non-PCI impaired loans | Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		0
Non-PCI impaired loans | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		0
Non-PCI impaired loans | Significant Other Observable Inputs (Level 2) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		0
Non-PCI impaired loans | Significant Other Observable Inputs (Level 2) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		0
Non-PCI impaired loans | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		49,679
Non-PCI impaired loans | Significant Unobservable Inputs (Level 3) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		48,307
Non-PCI impaired loans | Significant Unobservable Inputs (Level 3) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		1,372
Non-PCI impaired loans | Commercial and industrial (“C&I”) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		47,554
Non-PCI impaired loans | Commercial and industrial (“C&I”) | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		0
Non-PCI impaired loans | Commercial and industrial (“C&I”) | Significant Other Observable Inputs (Level 2) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		0
Non-PCI impaired loans | Commercial and industrial (“C&I”) | Significant Unobservable Inputs (Level 3) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		47,554
Non-PCI impaired loans | Commercial real estate (“CRE”) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		753
Non-PCI impaired loans | Commercial real estate (“CRE”) | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		0
Non-PCI impaired loans | Commercial real estate (“CRE”) | Significant Other Observable Inputs (Level 2) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		0
Non-PCI impaired loans | Commercial real estate (“CRE”) | Significant Unobservable Inputs (Level 3) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		753
Non-PCI impaired loans | HELOCs | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		1,372
Non-PCI impaired loans | HELOCs | Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		0
Non-PCI impaired loans | HELOCs | Significant Other Observable Inputs (Level 2) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		0
Non-PCI impaired loans | HELOCs | Significant Unobservable Inputs (Level 3) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Individually evaluated loans (current period)/Non-PCI impaired loans (prior period)		1,372
OREO
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		125
OREO | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		0
OREO | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		0
OREO | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		125
Investments in tax credit and other investments, net
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	6,216	3,076
Investments in tax credit and other investments, net | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	0	0
Investments in tax credit and other investments, net | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	0	0
Investments in tax credit and other investments, net | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	$ 6,216	3,076
Other nonperforming assets
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		1,167
Other nonperforming assets | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		0
Other nonperforming assets | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		0
Other nonperforming assets | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		$ 1,167

X

- Definition Impaired Loans, Fair Value Disclosure + References No definition available. + Details Name: ewbc_ImpairedLoansFairValueDisclosure Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

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X

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v3.20.2

Fair Value Measurement and Fair Value of Financial Instruments (Increase (Decrease) in Fair Value of Assets Measured on a Nonrecurring Basis) (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Individually evaluated loans
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	$ (9,181)		$ (28,414)
Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets		$ (23,999)		$ (25,819)
OREO
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	0	(3)	0	(3)
Investments in tax credit and other investments, net
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(733)	(2,892)	(583)	(9,870)
Other nonperforming assets
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	0	0	0	(3,000)
Commercial lending | Individually evaluated loans
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(9,117)		(30,648)
Commercial lending | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets		(23,999)		(25,819)
Commercial lending | Commercial and industrial (“C&I”) | Individually evaluated loans
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(8,846)		(30,372)
Commercial lending | Commercial and industrial (“C&I”) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets		(24,001)		(25,823)
Commercial lending | Commercial real estate (“CRE”) | Individually evaluated loans
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(271)		(276)
Commercial lending | Commercial real estate (“CRE”) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets		2		4
Consumer lending | Individually evaluated loans
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(64)		2,234
Consumer lending | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets		0		0
Consumer lending | HELOCs | Individually evaluated loans
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(64)		(257)
Consumer lending | HELOCs | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets		0		0
Consumer lending | Other consumer | Individually evaluated loans
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	$ 0		$ 2,491
Consumer lending | Other consumer | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets		$ 0		$ 0

X

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v3.20.2

Fair Value Measurement and Fair Value of Financial Instruments (Carrying and Fair Value Estimates per the Fair Value Hierarchy of Financial Instruments Measured on a Nonrecurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financial assets:
Cash and cash equivalents	$ 4,533,502	$ 3,261,149
Interest-bearing deposits with banks	531,591	196,161
Resale agreements	1,260,000	860,000
Restricted equity securities, at cost	78,963	78,580
Loans held-for-investment, net	36,597,341	34,420,252
Financial liabilities:
FHLB advances	656,759	745,915
Repurchase agreements	300,000	200,000
Gross repurchase agreements	300,000	450,000
Carrying amount of repurchase agreements eligible for netting against resale agreements	0	250,000
Carrying Amount
Financial assets:
Cash and cash equivalents	4,533,502	3,261,149
Interest-bearing deposits with banks	531,591	196,161
Resale agreements	1,260,000	860,000
Restricted equity securities, at cost	78,963	78,580
Loans held-for-sale	3,875	434
Loans held-for-investment, net	36,597,341	34,420,252
Mortgage servicing rights	5,363	6,068
Accrued interest receivable	149,595	144,599
Financial liabilities:
Demand, checking, savings and money market deposits	31,410,130	27,109,951
Time deposits	9,262,548	10,214,308
Short-term borrowings	252,851	28,669
FHLB advances	656,759	745,915
Repurchase agreements	300,000	200,000
Long-term debt	1,575,653	147,101
Accrued interest payable	23,007	27,246
Estimated Fair Value
Financial assets:
Cash and cash equivalents	4,533,502	3,261,149
Interest-bearing deposits with banks	531,591	196,161
Resale agreements	1,263,068	856,025
Restricted equity securities, at cost	78,963	78,580
Loans held-for-sale	3,875	434
Loans held-for-investment, net	36,714,052	35,021,300
Mortgage servicing rights	7,798	8,199
Accrued interest receivable	149,595	144,599
Financial liabilities:
Demand, checking, savings and money market deposits	31,410,130	27,109,951
Time deposits	9,295,199	10,208,895
Short-term borrowings	252,851	28,669
FHLB advances	667,996	755,371
Repurchase agreements	320,361	232,597
Long-term debt	1,578,801	152,641
Accrued interest payable	23,007	27,246
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	4,533,502	3,261,149
Interest-bearing deposits with banks	0	0
Resale agreements	0	0
Restricted equity securities, at cost	0	0
Loans held-for-sale	0	0
Loans held-for-investment, net	0	0
Mortgage servicing rights	0	0
Accrued interest receivable	0	0
Financial liabilities:
Demand, checking, savings and money market deposits	0	0
Time deposits	0	0
Short-term borrowings	0	0
FHLB advances	0	0
Repurchase agreements	0	0
Long-term debt	0	0
Accrued interest payable	0	0
Estimated Fair Value | Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and cash equivalents	0	0
Interest-bearing deposits with banks	531,591	196,161
Resale agreements	1,263,068	856,025
Restricted equity securities, at cost	78,963	78,580
Loans held-for-sale	3,875	434
Loans held-for-investment, net	0	0
Mortgage servicing rights	0	0
Accrued interest receivable	149,595	144,599
Financial liabilities:
Demand, checking, savings and money market deposits	31,410,130	27,109,951
Time deposits	9,295,199	10,208,895
Short-term borrowings	252,851	28,669
FHLB advances	667,996	755,371
Repurchase agreements	320,361	232,597
Long-term debt	1,578,801	152,641
Accrued interest payable	23,007	27,246
Estimated Fair Value | Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	0	0
Interest-bearing deposits with banks	0	0
Resale agreements	0	0
Restricted equity securities, at cost	0	0
Loans held-for-sale	0	0
Loans held-for-investment, net	36,714,052	35,021,300
Mortgage servicing rights	7,798	8,199
Accrued interest receivable	0	0
Financial liabilities:
Demand, checking, savings and money market deposits	0	0
Time deposits	0	0
Short-term borrowings	0	0
FHLB advances	0	0
Repurchase agreements	0	0
Long-term debt	0	0
Accrued interest payable	$ 0	$ 0

X

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details Name: us-gaap_AdvancesFromFederalHomeLoanBanks Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120238483&loc=d3e48678-111004 + Details Name: us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details Name: us-gaap_LongTermDebt Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details Name: us-gaap_SecuritiesSoldUnderAgreementsToRepurchase Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122739-111746 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details Name: us-gaap_ServicingAssetAtAmortizedValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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v3.20.2

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Resale Agreements and Repurchase Agreements) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Resale agreements
Gross resale agreements	$ 1,260,000		$ 1,260,000		$ 1,110,000
Weighted-average yields	2.14%	2.71%	2.32%	2.77%
Repurchase agreements
Gross repurchase agreements	$ 300,000		$ 300,000		$ 450,000
Weighted-average rates	3.40%	4.93%	3.76%	4.97%
Repurchase agreements’ extinguishment costs	$ 8,740	$ 0	$ 8,740	$ 0
Extinguishment of repurchase agreements	150,000		150,000
Maturity, 2023	$ 300,000		$ 300,000

X

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X

- References No definition available. + Details Name: us-gaap_SecuritiesPurchasedUnderAgreementsToResellAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details Name: us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

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v3.20.2

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Balance Sheet Offsetting) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets, Resale Agreements
Gross Amounts of Recognized Assets	$ 1,260,000	$ 1,110,000
Gross Amounts Offset on the Consolidated Balance Sheet	0	(250,000)
Net Amounts of Assets Presented on the Consolidated Balance Sheet	1,260,000	860,000
Securities Purchased under Agreements to Resell Gross Amounts Not Offset [Abstract]
Collateral Received	(1,258,866)	(856,058)
Net Amount	1,134	3,942
Liabilities, Repurchase Agreements
Gross Amounts of Recognized Liabilities	300,000	450,000
Gross Amounts Offset on the Consolidated Balance Sheet	0	(250,000)
Net Amounts of Liabilities Presented on the Consolidated Balance Sheet	300,000	200,000
Securities Sold under Agreements to Repurchase Gross Amounts Not Offset [Abstract]
Collateral Pledged	(300,000)	(200,000)
Net Amount	$ 0	$ 0

X

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X

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X

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X

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- Definition Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details Name: us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

v3.20.2

Securities (Schedule of Available-for-sale Debt Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Debt Securities
Amortized Cost	$ 3,823,714	$ 3,320,648
Gross Unrealized Gains	90,565	19,805
Gross Unrealized Losses	(29,705)	(23,239)
AFS debt securities	3,884,574	3,317,214
U.S. Treasury securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	250,494	177,215
Gross Unrealized Gains	707	0
Gross Unrealized Losses	0	(793)
AFS debt securities	251,201	176,422
U.S. government agency and U.S. government-sponsored enterprise debt securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	433,923	584,275
Gross Unrealized Gains	8,853	1,377
Gross Unrealized Losses	(132)	(4,407)
AFS debt securities	442,644	581,245
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	827,929	599,814
Gross Unrealized Gains	34,585	8,551
Gross Unrealized Losses	(4,074)	(4,894)
AFS debt securities	858,440	603,471
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	1,246,609	998,447
Gross Unrealized Gains	34,445	6,927
Gross Unrealized Losses	(159)	(1,477)
AFS debt securities	1,280,895	1,003,897
Municipal securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	208,333	101,621
Gross Unrealized Gains	7,002	790
Gross Unrealized Losses	(151)	(109)
AFS debt securities	215,184	102,302
Non-agency commercial mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	148,322	86,609
Gross Unrealized Gains	3,989	1,947
Gross Unrealized Losses	(943)	(6)
AFS debt securities	151,368	88,550
Non-agency residential mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	113,548	46,830
Gross Unrealized Gains	804	3
Gross Unrealized Losses	(14)	(285)
AFS debt securities	114,338	46,548
Corporate debt securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	31,254	11,250
Gross Unrealized Gains	74	12
Gross Unrealized Losses	(502)	(113)
AFS debt securities	30,826	11,149
Foreign bonds
Schedule of Available-for-sale Debt Securities
Amortized Cost	204,540	354,481
Gross Unrealized Gains	106	198
Gross Unrealized Losses	(566)	(507)
AFS debt securities	204,080	354,172
Asset-backed securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	64,762	66,106
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3,143)	(1,354)
AFS debt securities	61,619	64,752
Collateralized loan obligations (“CLOs”)
Schedule of Available-for-sale Debt Securities
Amortized Cost	294,000	294,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(20,021)	(9,294)
AFS debt securities	$ 273,979	$ 284,706

X

- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details Name: us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details Name: us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details Name: us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details Name: us-gaap_AvailableForSaleSecuritiesDebtSecurities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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v3.20.2

Securities (Continuous Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	$ 725,825	$ 1,388,661
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(25,946)	(18,990)
Available-for-sale debt securities, 12 Months or More, Fair Value	64,527	351,048
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(3,759)	(4,249)
Available-for-sale debt securities Fair Value, Total	790,352	1,739,709
Available-for-sale debt securities, Gross Unrealized Loss, Total	(29,705)	(23,239)
U.S. Treasury securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value		0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months		0
Available-for-sale debt securities, 12 Months or More, Fair Value		176,422
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More		(793)
Available-for-sale debt securities Fair Value, Total		176,422
Available-for-sale debt securities, Gross Unrealized Loss, Total		(793)
U.S. government agency and U.S. government-sponsored enterprise debt securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	24,868	310,349
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(132)	(4,407)
Available-for-sale debt securities, 12 Months or More, Fair Value	0	0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	0	0
Available-for-sale debt securities Fair Value, Total	24,868	310,349
Available-for-sale debt securities, Gross Unrealized Loss, Total	(132)	(4,407)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	139,097	204,675
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(3,477)	(2,346)
Available-for-sale debt securities, 12 Months or More, Fair Value	11,572	108,314
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(597)	(2,548)
Available-for-sale debt securities Fair Value, Total	150,669	312,989
Available-for-sale debt securities, Gross Unrealized Loss, Total	(4,074)	(4,894)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	91,491	325,354
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(157)	(1,234)
Available-for-sale debt securities, 12 Months or More, Fair Value	195	34,337
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(2)	(243)
Available-for-sale debt securities Fair Value, Total	91,686	359,691
Available-for-sale debt securities, Gross Unrealized Loss, Total	(159)	(1,477)
Municipal securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	8,617	31,130
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(151)	(109)
Available-for-sale debt securities, 12 Months or More, Fair Value	0	0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	0	0
Available-for-sale debt securities Fair Value, Total	8,617	31,130
Available-for-sale debt securities, Gross Unrealized Loss, Total	(151)	(109)
Non-agency commercial mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	59,418	7,914
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(943)	(6)
Available-for-sale debt securities, 12 Months or More, Fair Value	0	0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	0	0
Available-for-sale debt securities Fair Value, Total	59,418	7,914
Available-for-sale debt securities, Gross Unrealized Loss, Total	(943)	(6)
Non-agency residential mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	23,720	42,894
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(14)	(285)
Available-for-sale debt securities, 12 Months or More, Fair Value	0	0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	0	0
Available-for-sale debt securities Fair Value, Total	23,720	42,894
Available-for-sale debt securities, Gross Unrealized Loss, Total	(14)	(285)
Corporate debt securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	1,002	0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(2)	0
Available-for-sale debt securities, 12 Months or More, Fair Value	9,500	9,888
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(500)	(113)
Available-for-sale debt securities Fair Value, Total	10,502	9,888
Available-for-sale debt securities, Gross Unrealized Loss, Total	(502)	(113)
Foreign bonds
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	85,274	129,074
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(566)	(407)
Available-for-sale debt securities, 12 Months or More, Fair Value	0	9,900
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	0	(100)
Available-for-sale debt securities Fair Value, Total	85,274	138,974
Available-for-sale debt securities, Gross Unrealized Loss, Total	(566)	(507)
Asset-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	18,359	52,565
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(483)	(902)
Available-for-sale debt securities, 12 Months or More, Fair Value	43,260	12,187
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(2,660)	(452)
Available-for-sale debt securities Fair Value, Total	61,619	64,752
Available-for-sale debt securities, Gross Unrealized Loss, Total	(3,143)	(1,354)
Collateralized loan obligations (“CLOs”)
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	273,979	284,706
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(20,021)	(9,294)
Available-for-sale debt securities, 12 Months or More, Fair Value	0	0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	0	0
Available-for-sale debt securities Fair Value, Total	273,979	284,706
Available-for-sale debt securities, Gross Unrealized Loss, Total	$ (20,021)	$ (9,294)

X

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details Name: us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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X

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v3.20.2

Securities (Narrative) (Details)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) security	Jun. 30, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Unrealized Loss
Number of available-for-sale debt securities in an unrealized loss position	41	41	101
Collateralized loan obligations (“CLOs”)
Unrealized Loss
Number of available-for-sale debt securities in an unrealized loss position	3	3	3
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities
Unrealized Loss
Number of available-for-sale debt securities in an unrealized loss position	19	19	57
Asset-backed securities
Unrealized Loss
Number of available-for-sale debt securities in an unrealized loss position	4	4
U.S. government agency and U.S. government-sponsored enterprise debt securities
Unrealized Loss
Number of available-for-sale debt securities in an unrealized loss position			14
AFS debt securities
Unrealized Loss
AFS debt securities, accrued interest | $	$ 17,800,000	$ 17,800,000
OTTI credit losses | $		0	$ 0
Provision for credit losses | $	$ 0	$ 0

X

- Definition Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(4)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details Name: us-gaap_AccruedInvestmentIncomeReceivable Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), from change in present value of expected cash flows. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82922868-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922897-210455 + Details Name: us-gaap_DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455 + Details Name: us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions Namespace Prefix: us-gaap_ Data Type: xbrli:integerItemType Balance Type: na Period Type: instant

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- Definition This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which no such other than temporary impairment (OTTI) was previously recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL6284393-111563 + Details Name: us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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v3.20.2

Securities (Proceeds, Gross Realized Gains and Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales, available-for-sale debt securities	$ 177,917	$ 223,763	$ 484,380	$ 375,102
Gross realized gains, available-for-sale debt securities	9,640	1,447	11,169	3,008
Related tax expense, available-for-sale debt securities	$ 2,850	$ 428	$ 3,302	$ 889

X

- Definition Tax Expense on Sale of Available for Sale Debt Investment Securities + References No definition available. + Details Name: ewbc_TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details Name: us-gaap_DebtSecuritiesAvailableForSaleRealizedGain Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details Name: us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

v3.20.2

Securities (Scheduled Contractual Maturities of AFS Debt Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Amortized Cost
Due within one year	$ 561,935
Due after one year through five years	366,403
Due after five years through ten years	277,823
Due after ten years	2,617,553
Amortized Cost	3,823,714	$ 3,320,648
Fair Value
Due within one year	562,869
Due after one year through five years	371,895
Due after five years through ten years	289,730
Due after ten years	2,660,080
Total available-for-sale debt investment securities	3,884,574	3,317,214
Available for sale debt investment securities pledged as collateral, fair value	$ 745,163	$ 479,432

X

- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details Name: us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 + Details Name: us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details Name: us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 + Details Name: us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 + Details Name: us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 + Details Name: us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 + Details Name: us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- References No definition available. + Details Name: us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- References No definition available. + Details Name: us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 + Details Name: us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details Name: us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details Name: us-gaap_AvailableForSaleSecuritiesDebtSecurities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition The sum of the fair values, as of the date of each statement of financial position presented, of securities that are restricted as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details Name: us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

v3.20.2

Securities (Restricted Equity Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Federal Reserve Bank (“FRB”) stock	$ 58,781	$ 58,330
FHLB stock	20,182	20,250
Total restricted equity securities	$ 78,963	$ 78,580

X

- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details Name: us-gaap_FederalHomeLoanBankStock Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock. + References No definition available. + Details Name: us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details Name: us-gaap_FederalReserveBankStock Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- References No definition available. + Details Name: us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.20.2

Derivatives (Notional and Fair Values) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) Boe MMBTU company	Dec. 31, 2019 USD ($) Boe MMBTU company
Derivative Asset [Abstract]
Derivative assets - Fair value	$ 764,430	$ 330,316
Less: Master netting agreements	(110,569)	(121,561)
Less: Cash collateral received/paid	(11,649)	(3,758)
Derivative asset, after netting	642,212	204,997
Derivative Liability [Abstract]
Derivative liabilities - Fair value	560,169	256,528
Less: Master netting agreements	(110,569)	(121,561)
Less: Cash collateral received/paid	(94,435)	(38,238)
Derivative liability, after netting	$ 355,165	$ 96,729
Crude oil | Customer Counterparty
Derivative Liability [Abstract]
Derivative, nonmonetary notional amount, energy measure | Boe	6,155	7,811
Natural gas | Customer Counterparty
Derivative Liability [Abstract]
Derivative, nonmonetary notional amount, energy measure | MMBTU	84,957	63,773
Derivative instruments designated as hedging instruments
Derivative Instruments
Notional amount	$ 367,883	$ 117,193
Derivative Asset [Abstract]
Derivative assets - Fair value	245	0
Derivative Liability [Abstract]
Derivative liabilities - Fair value	1,657	4,784
Derivative instruments designated as hedging instruments | Fair Value Hedging | Interest rate contracts
Derivative Instruments
Notional amount	15,194	31,026
Derivative Asset [Abstract]
Derivative assets - Fair value	0	0
Derivative Liability [Abstract]
Derivative liabilities - Fair value	174	3,198
Derivative instruments designated as hedging instruments | Cash Flow Hedging | Interest rate contracts
Derivative Instruments
Notional amount	275,000	0
Derivative Asset [Abstract]
Derivative assets - Fair value	0	0
Derivative Liability [Abstract]
Derivative liabilities - Fair value	1,483	0
Derivative instruments designated as hedging instruments | Net Investment Hedging | Foreign exchange contracts
Derivative Instruments
Notional amount	77,689	86,167
Derivative Asset [Abstract]
Derivative assets - Fair value	245	0
Derivative Liability [Abstract]
Derivative liabilities - Fair value	0	1,586
Derivatives not designated as hedging instruments
Derivative Instruments
Notional amount	20,113,400	20,540,031
Derivative Asset [Abstract]
Derivative assets - Fair value	764,185	330,316
Derivative Liability [Abstract]
Derivative liabilities - Fair value	558,512	251,744
Derivatives not designated as hedging instruments | Interest rate contracts
Derivative Instruments
Notional amount	17,170,884	15,489,692
Derivative Asset [Abstract]
Derivative assets - Fair value	613,480	192,883
Derivative Liability [Abstract]
Derivative liabilities - Fair value	400,146	124,119
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivative Instruments
Notional amount	2,738,018	4,839,661
Derivative Asset [Abstract]
Derivative assets - Fair value	24,044	54,637
Derivative Liability [Abstract]
Derivative liabilities - Fair value	19,741	47,024
Derivatives not designated as hedging instruments | Credit contracts
Derivative Instruments
Notional amount	204,498	210,678
Derivative Asset [Abstract]
Derivative assets - Fair value	41	2
Derivative Liability [Abstract]
Derivative liabilities - Fair value	327	84
Derivatives not designated as hedging instruments | Equity contracts
Derivative Instruments
Notional amount	0	0
Derivative Asset [Abstract]
Derivative assets - Fair value	9,173	1,414
Derivative Liability [Abstract]
Derivative liabilities - Fair value	0	0
Derivatives not designated as hedging instruments | Commodity contracts
Derivative Instruments
Notional amount	0	0
Derivative Asset [Abstract]
Derivative assets - Fair value	117,447	81,380
Derivative Liability [Abstract]
Derivative liabilities - Fair value	$ 138,298	$ 80,517
Derivatives not designated as hedging instruments | Equity, Public Companies
Derivative Liability [Abstract]
Number of companies that issued the equity (issuers portion only) | company	3	3
Derivatives not designated as hedging instruments | Equity, Private Companies
Derivative Liability [Abstract]
Number of companies that issued the equity (issuers portion only) | company	17	18

X

- Definition Number of Companies that Issued the Warrants (Issuers Portion Only) + References No definition available. + Details Name: ewbc_NumberofCompaniesthatIssuedtheWarrantsIssuersPortionOnly Namespace Prefix: ewbc_ Data Type: xbrli:integerItemType Balance Type: na Period Type: instant

X

- Definition Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details Name: us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226003-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeAssetFairValueGrossLiability Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_DerivativeAssetsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details Name: us-gaap_DerivativeLiabilities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_DerivativeLiabilitiesAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226003-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 + Details Name: us-gaap_DerivativeLiabilityFairValueGrossAsset Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Nominal energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details Name: us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure Namespace Prefix: us-gaap_ Data Type: num:energyItemType Balance Type: na Period Type: duration

X

- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details Name: us-gaap_DerivativeNotionalAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: na Period Type: instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DerivativesFairValueLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Details Name: srt_EnergyAxis=srt_CrudeOilMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: srt_CounterpartyNameAxis=ewbc_CustomerCounterpartyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: srt_EnergyAxis=srt_NaturalGasReservesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CreditRiskContractMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_EquityContractMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_DerivativeInstrumentRiskAxis=ewbc_EquityPublicCompaniesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=ewbc_EquityPrivateCompaniesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Derivatives (Net Gains (Losses) on Derivatives Designated as Hedges) (Details) - Fair Value Hedging - Derivative instruments designated as hedging instruments - Interest Expense - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Deposits
Derivative [Line Items]
Recognized on certificates of deposit	$ (357)	$ (1,434)	$ (1,719)	$ (2,695)
Interest rate contracts
Derivative [Line Items]
Recognized on interest rate swaps	$ 951	$ 1,634	$ 2,996	$ 2,854

X

- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986 + Details Name: us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986 + Details Name: us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DerivativeLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_FairValueHedgingMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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X

- Details Name: us-gaap_FinancialInstrumentAxis=us-gaap_DepositsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Derivatives (Hedged Items Currently Designated) (Details) - Derivative instruments designated as hedging instruments - Fair Value Hedging - Interest rate contracts - Deposits - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Hedged liability, fair value hedge, carrying value	$ (14,986)	$ (29,080)
Hedged liability, fair value hedge, cumulative decrease, carrying value	$ (114)	$ 1,604

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DerivativeLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of liability hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109999712-113959 + Details Name: us-gaap_HedgedLiabilityFairValueHedge Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109999712-113959 + Details Name: us-gaap_HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Details Name: us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancialInstrumentAxis=us-gaap_DepositsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Derivatives (Narrative) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) Boe MMBTU company	Dec. 31, 2019 USD ($) MMBTU Boe company
Derivative [Line Items]
Derivative assets - Fair value	$ 764,430	$ 330,316
Derivative liabilities - Fair value	560,169	256,528
Credit-risk-related contingent features
Derivative [Line Items]
Aggregate fair value of derivative instruments in net liability position	136,600	56,400
Derivative asset		14,400
Derivative liability		70,800
Collateral posted	136,500	56,400
Derivative instruments designated as hedging instruments
Derivative [Line Items]
Notional amount	367,883	117,193
Derivative assets - Fair value	245	0
Derivative liabilities - Fair value	1,657	4,784
Derivative instruments designated as hedging instruments | Interest rate contracts | Cash Flow Hedging
Derivative [Line Items]
Notional amount	275,000	0
Net unrealized gains, net of tax, recorded in AOCI expected to be reclassified into earnings during next 12 months	183
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	1,483	0
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	20,113,400	20,540,031
Derivative assets - Fair value	764,185	330,316
Derivative liabilities - Fair value	558,512	251,744
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivative [Line Items]
Notional amount	2,738,018	4,839,661
Derivative assets - Fair value	24,044	54,637
Derivative liabilities - Fair value	19,741	47,024
Derivatives not designated as hedging instruments | Interest rate contracts
Derivative [Line Items]
Notional amount	17,170,884	15,489,692
Derivative assets - Fair value	613,480	192,883
Derivative liabilities - Fair value	400,146	124,119
Derivatives not designated as hedging instruments | Interest rate contracts | Financial Counterparty
Derivative [Line Items]
Notional amount	8,600,000	7,750,000
Derivatives not designated as hedging instruments | Interest rate contracts | LCH
Derivative [Line Items]
Notional amount	2,820,000	2,530,000
Derivative assets - Fair value		2,900
Derivative liabilities - Fair value	229,800	75,100
Derivatives not designated as hedging instruments | Credit contracts
Derivative [Line Items]
Notional amount	204,498	210,678
Derivative assets - Fair value	41	2
Derivative liabilities - Fair value	$ 327	$ 84
Weighted average remaining maturity of outstanding RPAs	1 year 8 months 12 days	2 years 2 months 12 days
Derivatives not designated as hedging instruments | Credit contracts | RPA protection sold
Derivative [Line Items]
Maximum exposure of RPAs with protection sold	$ 778	$ 125
Derivatives not designated as hedging instruments | Equity, Public Companies
Derivative [Line Items]
Number of companies that issued the equity (issuers portion only) | company	3	3
Derivatives not designated as hedging instruments | Equity contracts
Derivative [Line Items]
Notional amount	$ 0	$ 0
Derivative assets - Fair value	9,173	1,414
Derivative liabilities - Fair value	0	0
Derivatives not designated as hedging instruments | Commodity contracts
Derivative [Line Items]
Notional amount	0	0
Derivative assets - Fair value	117,447	81,380
Derivative liabilities - Fair value	138,298	80,517
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME)
Derivative [Line Items]
Derivative assets - Fair value	25,000	2,900
Derivative liabilities - Fair value	631	1,500
Derivative assets (liabilities), at fair value, net	$ 2,300	$ 986
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME) | Oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	1,532	1,752
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME) | Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	24,895	6,075
Maximum | Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivative [Line Items]
Original maturity (in years)	1 year	1 year
Derivative Financial Instruments, Assets | Derivative instruments designated as hedging instruments | Foreign exchange contracts
Derivative [Line Items]
Derivative assets - Fair value	$ 245
Derivative Financial Instruments, Liabilities | Derivative instruments designated as hedging instruments | Foreign exchange contracts
Derivative [Line Items]
Notional amount	$ 77,700	$ 86,200
Derivative liabilities - Fair value		$ 1,600

X

- Definition Derivative, Original Maturity + References No definition available. + Details Name: ewbc_DerivativeOriginalMaturity Namespace Prefix: ewbc_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Definition Number of Companies that Issued the Warrants (Issuers Portion Only) + References No definition available. + Details Name: ewbc_NumberofCompaniesthatIssuedtheWarrantsIssuersPortionOnly Namespace Prefix: ewbc_ Data Type: xbrli:integerItemType Balance Type: na Period Type: instant

X

- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624258-113959 + Details Name: us-gaap_CollateralAlreadyPostedAggregateFairValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5708775-113959 + Details Name: us-gaap_CreditDerivativeMaximumExposureUndiscounted Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details Name: us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details Name: us-gaap_DerivativeAverageRemainingMaturity1 Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 + Details Name: us-gaap_DerivativeFairValueOfDerivativeAsset Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details Name: us-gaap_DerivativeFairValueOfDerivativeLiability Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DerivativeLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624258-113959 + Details Name: us-gaap_DerivativeNetLiabilityPositionAggregateFairValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Nominal energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details Name: us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure Namespace Prefix: us-gaap_ Data Type: num:energyItemType Balance Type: na Period Type: duration

X

- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details Name: us-gaap_DerivativeNotionalAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: na Period Type: instant

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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details Name: us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Details Name: us-gaap_DerivativeInstrumentRiskAxis=ewbc_CreditRiskRelatedContingentFeaturesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

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v3.20.2

Derivatives (Gains (Losses) in Foreign Currency Translation Adjustment and in Cash Flow Hedges) (Details) - Derivative instruments designated as hedging instruments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cash Flow Hedging | Interest rate contracts
Derivative [Line Items]
Gains (losses) recognized in AOCI	$ (1,483)	$ 0	$ (1,483)	$ 0
Gains (losses) reclassified from AOCI to Interest expense	377	0	377	0
Net Investment Hedging | Foreign exchange contracts
Derivative [Line Items]
Gains (losses) recognized in AOCI	$ (377)	$ (598)	$ 627	$ (2,603)

X

- Definition Other comprehensive income (loss) on derivatives instrument designated and qualifying in Net Investment Hedge Period Increase (Decrease). + References No definition available. + Details Name: ewbc_OtherComprehensiveIncomeLossNetInvestmentHedgeGainLoss Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DerivativeLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121577181&loc=SL110061190-113977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 + Details Name: us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details Name: us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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v3.20.2

Derivatives (Derivatives Not Designated as Hedging Instruments - Interest Rate Contracts) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative assets - Fair value	$ 764,430	$ 330,316
Derivative liabilities - Fair value	560,169	256,528
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	20,113,400	20,540,031
Derivative assets - Fair value	764,185	330,316
Derivative liabilities - Fair value	558,512	251,744
Derivatives not designated as hedging instruments | Interest rate contracts
Derivative [Line Items]
Notional amount	17,170,884	15,489,692
Derivative assets - Fair value	613,480	192,883
Derivative liabilities - Fair value	400,146	124,119
Derivatives not designated as hedging instruments | Financial Counterparty | Interest rate contracts
Derivative [Line Items]
Notional amount	8,600,000	7,750,000
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Written options
Derivative [Line Items]
Notional amount	858,996	1,003,558
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	241	66
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Sold collars and corridors
Derivative [Line Items]
Notional amount	531,098	490,852
Derivative assets - Fair value	10,658	1,971
Derivative liabilities - Fair value	1	16
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Swaps
Derivative [Line Items]
Notional amount	7,179,331	6,247,667
Derivative assets - Fair value	601,250	187,294
Derivative liabilities - Fair value	0	6,237
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Interest rate contracts
Derivative [Line Items]
Notional amount	8,569,425	7,742,077
Derivative assets - Fair value	611,908	189,265
Derivative liabilities - Fair value	242	6,319
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Purchased options
Derivative [Line Items]
Notional amount	858,996	1,003,558
Derivative assets - Fair value	241	67
Derivative liabilities - Fair value	0	0
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Collars and corridors
Derivative [Line Items]
Notional amount	531,098	490,852
Derivative assets - Fair value	1	17
Derivative liabilities - Fair value	10,696	1,996
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Swaps
Derivative [Line Items]
Notional amount	7,211,365	6,253,205
Derivative assets - Fair value	1,330	3,534
Derivative liabilities - Fair value	389,208	115,804
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Interest rate contracts
Derivative [Line Items]
Notional amount	8,601,459	7,747,615
Derivative assets - Fair value	1,572	3,618
Derivative liabilities - Fair value	$ 399,904	$ 117,800

X

- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DerivativeLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details Name: us-gaap_DerivativeNotionalAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: na Period Type: instant

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v3.20.2

Derivatives (Derivatives Not Designated as Hedging Instruments - Foreign Exchange Contracts) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative assets - Fair value	$ 764,430	$ 330,316
Derivative liabilities - Fair value	560,169	256,528
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	20,113,400	20,540,031
Derivative assets - Fair value	764,185	330,316
Derivative liabilities - Fair value	558,512	251,744
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivative [Line Items]
Notional amount	2,738,018	4,839,661
Derivative assets - Fair value	24,044	54,637
Derivative liabilities - Fair value	19,741	47,024
Foreign exchange contracts | Customer Counterparty | Derivatives not designated as hedging instruments | Forwards and spot
Derivative [Line Items]
Notional amount	1,768,864	3,581,036
Derivative assets - Fair value	17,940	45,911
Derivative liabilities - Fair value	14,246	40,591
Foreign exchange contracts | Customer Counterparty | Derivatives not designated as hedging instruments | Swaps
Derivative [Line Items]
Notional amount	7,160	6,889
Derivative assets - Fair value	0	16
Derivative liabilities - Fair value	42	84
Foreign exchange contracts | Customer Counterparty | Derivatives not designated as hedging instruments | Written options
Derivative [Line Items]
Notional amount		87,036
Derivative assets - Fair value		127
Derivative liabilities - Fair value		0
Foreign exchange contracts | Customer Counterparty | Derivatives not designated as hedging instruments | Collars
Derivative [Line Items]
Notional amount	1,685	2,244
Derivative assets - Fair value	2	0
Derivative liabilities - Fair value	0	14
Foreign exchange contracts | Customer Counterparty | Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivative [Line Items]
Notional amount	1,777,709	3,677,205
Derivative assets - Fair value	17,942	46,054
Derivative liabilities - Fair value	14,288	40,689
Foreign exchange contracts | Financial Counterparty | Derivatives not designated as hedging instruments | Forwards and spot
Derivative [Line Items]
Notional amount	62,424	207,492
Derivative assets - Fair value	62	1,400
Derivative liabilities - Fair value	98	507
Foreign exchange contracts | Financial Counterparty | Derivatives not designated as hedging instruments | Swaps
Derivative [Line Items]
Notional amount	734,640	702,391
Derivative assets - Fair value	4,502	6,156
Derivative liabilities - Fair value	3,808	4,712
Foreign exchange contracts | Financial Counterparty | Derivatives not designated as hedging instruments | Purchased options
Derivative [Line Items]
Notional amount		87,036
Derivative assets - Fair value		0
Derivative liabilities - Fair value		127
Foreign exchange contracts | Financial Counterparty | Derivatives not designated as hedging instruments | Collars
Derivative [Line Items]
Notional amount	162,245	165,537
Derivative assets - Fair value	1,538	1,027
Derivative liabilities - Fair value	1,547	989
Foreign exchange contracts | Financial Counterparty | Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivative [Line Items]
Notional amount	959,309	1,162,456
Derivative assets - Fair value	6,102	8,583
Derivative liabilities - Fair value	$ 5,453	$ 6,335

X

- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DerivativeLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details Name: us-gaap_DerivativeNotionalAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: na Period Type: instant

X

- Details Name: us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

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X

- Details Name: ewbc_DerivativeRiskCategoryAxis=us-gaap_ForeignExchangeContractMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: srt_CounterpartyNameAxis=ewbc_CustomerCounterpartyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=ewbc_ForwardsandSpotsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_SwapMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=ewbc_WrittenOptionMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=ewbc_CollarsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: srt_CounterpartyNameAxis=ewbc_FinancialCounterpartyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=ewbc_PurchasedOptionsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Derivatives (Derivatives Not Designated as Hedging Instruments - Credit Contracts) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative assets - Fair value	$ 764,430	$ 330,316
Derivative liabilities - Fair value	560,169	256,528
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	20,113,400	20,540,031
Derivative assets - Fair value	764,185	330,316
Derivative liabilities - Fair value	558,512	251,744
Credit contracts | Derivatives not designated as hedging instruments | Other credit derivatives
Derivative [Line Items]
Notional amount	204,497	210,678
Derivative assets - Fair value	41	2
Derivative liabilities - Fair value	327	84
Credit contracts | Derivatives not designated as hedging instruments | Other credit derivatives | RPA protection sold
Derivative [Line Items]
Notional amount	193,783	199,964
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	327	84
Credit contracts | Derivatives not designated as hedging instruments | Other credit derivatives | RPA protection purchased
Derivative [Line Items]
Notional amount	10,714	10,714
Derivative assets - Fair value	41	2
Derivative liabilities - Fair value	$ 0	$ 0

X

- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DerivativeLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details Name: us-gaap_DerivativeNotionalAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: na Period Type: instant

X

- Details Name: us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: ewbc_DerivativeRiskCategoryAxis=us-gaap_CreditRiskContractMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_OtherCreditDerivativesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_PositionAxis=us-gaap_LongMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_PositionAxis=us-gaap_ShortMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Derivatives (Derivatives Not Designated as Hedging Instruments - Commodity Contracts) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) MMBTU Boe	Jun. 30, 2019 MMBTU Boe	Dec. 31, 2019 USD ($) Boe MMBTU
Derivative [Line Items]
Derivative assets - Fair value	$ 764,430		$ 330,316
Derivative liabilities - Fair value	$ 560,169		$ 256,528
Customer Counterparty | Crude oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	6,155		7,811
Customer Counterparty | Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	84,957		63,773
Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative assets - Fair value	$ 764,185		$ 330,316
Derivative liabilities - Fair value	558,512		251,744
Derivatives not designated as hedging instruments | Commodity contracts
Derivative [Line Items]
Derivative assets - Fair value	117,447		81,380
Derivative liabilities - Fair value	138,298		80,517
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Commodity contracts
Derivative [Line Items]
Derivative assets - Fair value	31,767		40,065
Derivative liabilities - Fair value	$ 104,968		42,140
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Written options
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	0	36
Derivative assets - Fair value	$ 0		0
Derivative liabilities - Fair value	$ 70		30
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	1,966	3,174
Derivative assets - Fair value	$ 63		2,673
Derivative liabilities - Fair value	$ 20,463		538
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	4,189	4,601
Derivative assets - Fair value	$ 1,273		6,949
Derivative liabilities - Fair value	$ 51,320		5,531
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	6,155	7,811
Derivative assets - Fair value	$ 1,336		9,622
Derivative liabilities - Fair value	$ 71,853		6,099
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Written options
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure	1,033	540
Derivative assets - Fair value	$ 0		0
Derivative liabilities - Fair value	$ 172		22
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	13,066	14,277
Derivative assets - Fair value	$ 881		186
Derivative liabilities - Fair value	$ 955		522
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	70,858	48,956
Derivative assets - Fair value	$ 29,550		30,257
Derivative liabilities - Fair value	$ 31,988		35,497
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	84,957	63,773
Derivative assets - Fair value	$ 30,431		30,443
Derivative liabilities - Fair value	33,115		36,041
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Commodity contracts
Derivative [Line Items]
Derivative assets - Fair value	85,680		41,315
Derivative liabilities - Fair value	$ 33,330		38,377
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Purchased options
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	0	36
Derivative assets - Fair value	$ 70		29
Derivative liabilities - Fair value	$ 0		0
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	2,218	3,630
Derivative assets - Fair value	$ 21,847		677
Derivative liabilities - Fair value	$ 1,607		2,815
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	4,261	4,721
Derivative assets - Fair value	$ 32,875		4,516
Derivative liabilities - Fair value	$ 1,779		5,215
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	6,479	8,387
Derivative assets - Fair value	$ 54,792		5,222
Derivative liabilities - Fair value	$ 3,386		8,030
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Purchased options
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure	1,023	530
Derivative assets - Fair value	$ 157		21
Derivative liabilities - Fair value	$ 0		0
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	13,186	14,517
Derivative assets - Fair value	$ 883		471
Derivative liabilities - Fair value	$ 881		150
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	78,528	48,779
Derivative assets - Fair value	$ 29,848		35,601
Derivative liabilities - Fair value	$ 29,063		30,197
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	92,737	63,826
Derivative assets - Fair value	$ 30,888		36,093
Derivative liabilities - Fair value	$ 29,944		$ 30,347

X

- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details Name: us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DerivativeLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Nominal energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details Name: us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure Namespace Prefix: us-gaap_ Data Type: num:energyItemType Balance Type: na Period Type: duration

X

- Details Name: srt_CounterpartyNameAxis=ewbc_CustomerCounterpartyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: srt_EnergyAxis=srt_NaturalGasReservesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: ewbc_DerivativeRiskCategoryAxis=us-gaap_CommodityContractMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=ewbc_WrittenOptionMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=ewbc_CollarsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_SwapMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: srt_CounterpartyNameAxis=ewbc_FinancialCounterpartyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_DerivativeInstrumentRiskAxis=ewbc_PurchasedOptionsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Derivatives (Net Gains (Losses) on Derivatives Not Designated as Hedging Instruments) (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	$ 8,764	$ 2,995	$ 4,924	$ 7,879
Interest rate contracts | Interest rate contracts and other derivative income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	(5,361)	(1,359)	(12,372)	(3,138)
Foreign exchange contracts | Foreign exchange income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	6,201	3,495	9,062	9,821
Credit contracts | Interest rate contracts and other derivative income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	(75)	(36)	(98)	47
Equity contracts | Lending fees
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	8,070	917	8,379	1,167
Commodity contracts | Interest rate contracts and other derivative income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	$ (71)	$ (22)	$ (47)	$ (18)

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DerivativeInstrumentsGainLossLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details Name: us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Details Name: us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_IncomeStatementLocationAxis=ewbc_InterestratecontractsandotherderivativeincomeMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_IncomeStatementLocationAxis=us-gaap_ForeignCurrencyGainLossMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CreditRiskContractMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_EquityContractMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_IncomeStatementLocationAxis=ewbc_LendingfeesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Derivatives (Offsetting of Derivatives) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivative assets
Gross Amounts Recognized	$ 764,430	$ 330,316
Less: Master netting agreements	(110,569)	(121,561)
Less: Cash collateral received/pledged	(11,649)	(3,758)
Derivative asset, after netting	642,212	204,997
Less: Security Collateral Received	(13,447)	0
Net derivative assets	628,765	204,997
Derivative assets subject to master netting arrangements, gross amounts recognized	754,700	328,700
Contracts not subject to master netting arrangements, gross amounts recognized	9,700	1,600
Derivative, cash collateral received, including amount offset by fair value assets, and excess cash amount	18,100	3,800
Amount used to offset against derivative assets	11,649	3,758
Derivative liabilities
Gross Amounts Recognized	560,169	256,528
Less: Master netting agreements	(110,569)	(121,561)
Less: Cash collateral received/pledged	(94,435)	(38,238)
Derivative liability, after netting	355,165	96,729
Less: Security Collateral Pledged	(279,528)	(79,619)
Net derivative liabilities	75,637	17,110
Derivative liability subject to master netting arrangements, gross amounts recognized	560,000	256,528
Contracts not subject to master netting arrangements, gross amounts recognized	211	20
Derivative, cash collateral posted against derivative liabilities, including amount offset the derivative fair value liabilities, and excess cash amount	98,900	43,000
Amount used to offset against derivative liabilities	$ 94,435	$ 38,238

X

- Definition Derivative Assets Subject To Master Netting Arrangements, Gross Amounts Recognized + References No definition available. + Details Name: ewbc_DerivativeAssetsSubjectToMasterNettingArrangementsGrossAmountsRecognized Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Derivative, Cash Collateral Posted Against Derivative Liabilities, Including Amount Offset the Derivative Fair Value Liabilities, and Excess Cash Amount + References No definition available. + Details Name: ewbc_DerivativeCashCollateralPostedAgainstDerivativeLiabilitiesIncludingAmountOffsettheDerivativeFairValueLiabilitiesandExcessCashAmount Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Derivative, Cash Collateral Received, Including Amount Offset by Fair Value Assets, and Excess Cash Amount + References No definition available. + Details Name: ewbc_DerivativeCashCollateralReceivedIncludingAmountOffsetbyFairValueAssetsandExcessCashAmount Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Derivative Liability Subject To Master Netting Arrangements, Gross Amounts Recognized + References No definition available. + Details Name: ewbc_DerivativeLiabilitySubjectToMasterNettingArrangementsGrossAmountsRecognized Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

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v3.20.2

Loans Receivable and Allowance for Credit Losses (Composition of Loans Held-for-Investment) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	$ 37,229,412		$ 34,778,539
Allowance for loan losses	(632,071)		(358,287)
Loans held-for-investment, net	36,597,341		34,420,252
Net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts	(72,100)		(43,200)
Commercial and industrial (“C&I”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Allowance for loan losses	(756)
HELOCs
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Allowance for loan losses	(76)
Commercial lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	27,924,906		25,914,252
Commercial lending | Commercial and industrial (“C&I”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	13,422,691		12,150,931
Allowance for loan losses	(380,723)	$ (362,629)	(238,376)	$ (205,503)	$ (189,757)	$ (189,117)
Commercial lending | Commercial real estate (“CRE”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	10,902,114		10,278,448
Allowance for loan losses	(176,040)	(132,819)	(40,509)	(39,811)	(39,224)	(40,666)
Commercial lending | Real estate loan | Multifamily residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	3,032,385		2,856,374
Allowance for loan losses	(25,058)	(16,530)	(22,826)	(19,280)	(19,169)	(19,885)
Commercial lending | Construction and land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	567,716		628,499
Allowance for loan losses	(18,551)	(11,018)	(19,404)	(22,961)	(22,349)	(20,290)
Commercial lending | Total CRE
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	14,502,215		13,763,321
Consumer lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	9,304,506		8,864,287
Consumer lending | Real estate loan | Single-family residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	7,660,094		7,108,590
Allowance for loan losses	(25,314)	(26,822)	(28,527)	(32,763)	(35,759)	(31,340)
Consumer lending | HELOCs
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	1,461,951		1,472,783
Allowance for loan losses	(3,867)	(3,881)	(5,265)	(6,177)	(7,401)	(5,774)
Consumer lending | Total residential mortgage
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	9,122,045		8,581,373
Consumer lending | Other consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	182,461		282,914
Allowance for loan losses	$ (2,518)	$ (3,304)	(3,380)	$ (4,130)	$ (4,235)	$ (4,250)
Non-PCI Loans
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			34,555,668
Allowance for loan losses			(358,287)
Loans held-for-investment, net			34,197,381
Non-PCI Loans | Commercial lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			25,777,039
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			12,149,121
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			10,165,247
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			2,834,212
Non-PCI Loans | Commercial lending | Construction and land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			628,459
Non-PCI Loans | Commercial lending | Total CRE
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			13,627,918
Non-PCI Loans | Consumer lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			8,778,629
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			7,028,979
Non-PCI Loans | Consumer lending | HELOCs
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			1,466,736
Non-PCI Loans | Consumer lending | Total residential mortgage
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			8,495,715
Non-PCI Loans | Consumer lending | Other consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			282,914
PCI Loans
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			222,871
Allowance for loan losses			0
Loans held-for-investment, net			222,871
PCI Loans | Commercial lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			137,213
PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			1,810
Allowance for loan losses			0
PCI Loans | Commercial lending | Commercial real estate (“CRE”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			113,201
Allowance for loan losses			0
PCI Loans | Commercial lending | Real estate loan | Multifamily residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			22,162
Allowance for loan losses			0
PCI Loans | Commercial lending | Construction and land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			40
Allowance for loan losses			0
PCI Loans | Commercial lending | Total CRE
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			135,403
PCI Loans | Consumer lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			85,658
PCI Loans | Consumer lending | Real estate loan | Single-family residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			79,611
Allowance for loan losses			0
PCI Loans | Consumer lending | HELOCs
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			6,047
Allowance for loan losses			0
PCI Loans | Consumer lending | Total residential mortgage
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			85,658
PCI Loans | Consumer lending | Other consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment			0
Allowance for loan losses			$ 0

X

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- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details Name: us-gaap_NotesReceivableNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details Name: us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_CommercialAndIndustrialLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_MultifamilyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_ConstructionAndLandLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_TotalCommercialRealEstateMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_SingleFamilyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_TotalResidentialMortgageMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_OtherConsumerMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_CreditLossStatusAxis=ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Loans Receivable and Allowance for Credit Losses (Composition of Loans Held-for-Investment- Narrative) (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Accrued interest receivable	$ 111,800,000	$ 111,800,000	$ 121,800,000
Interest income related to nonaccrual loans reversed	1,200,000	1,600,000
Interest income recognized on nonaccrual loans	10,000	12,000
Loans receivable pledged to secure borrowings and to provide additional borrowing capacity from the FRB and the FHLB	27,408,027,000	27,408,027,000	$ 22,431,092,000
HELOCs
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Converted to term loan	12,100,000	43,400,000
Commercial And Industrial And Commercial Real Estate
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Converted to term loan	$ 0	$ 0

X

- Definition Financing Receivable, Amount Converted to term loans + References No definition available. + Details Name: ewbc_FinancingReceivableAmountConvertedtoTermLoans Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Net Reduction to Interest Income + References No definition available. + Details Name: ewbc_NetReductiontoInterestIncome Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_AccountsNotesAndLoansReceivableLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount, before allowance for credit loss, of accrued interest on financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL120267963-210447 + Details Name: us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of interest income on financing receivable on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 + Details Name: us-gaap_FinancingReceivableNonaccrualInterestIncome Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5086-111524 + Details Name: us-gaap_LoansPledgedAsCollateral Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_CommercialAndIndustrialAndCommercialRealEstateMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Loans Receivable and Allowance for Credit Losses (Credit Risk Ratings and/or Vintage Years for Loans Held-for-Investment by Portfolio Segment) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	$ 5,896,909
2019	8,429,073
2018	5,796,044
2017	3,409,990
2016	1,712,616
Prior	3,798,982
Revolving Loans Amortized Cost Basis	7,993,253
Revolving Loans Converted to Term Loans Amortized Cost Basis	192,545
Total	37,229,412	$ 34,778,539
Commercial lending
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	4,742,649
2019	6,434,759
2018	4,088,402
2017	2,226,428
2016	1,108,642
Prior	2,585,072
Revolving Loans Amortized Cost Basis	6,718,408
Revolving Loans Converted to Term Loans Amortized Cost Basis	20,546
Total	27,924,906	25,914,252
Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	2,931,604
2019	2,173,071
2018	924,901
2017	359,207
2016	92,427
Prior	389,608
Revolving Loans Amortized Cost Basis	6,542,043
Revolving Loans Converted to Term Loans Amortized Cost Basis	9,830
Total	13,422,691	12,150,931
Commercial lending | Commercial and industrial (“C&I”) | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	2,922,977
2019	2,010,048
2018	818,374
2017	328,471
2016	85,000
Prior	380,727
Revolving Loans Amortized Cost Basis	6,007,247
Revolving Loans Converted to Term Loans Amortized Cost Basis	9,830
Total	12,562,674
Commercial lending | Commercial and industrial (“C&I”) | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	525
2019	80,449
2018	54,144
2017	22,757
2016	150
Prior	6,105
Revolving Loans Amortized Cost Basis	251,461
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	415,591
Commercial lending | Commercial and industrial (“C&I”) | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	8,102
2019	82,574
2018	52,383
2017	7,979
2016	6,313
Prior	2,515
Revolving Loans Amortized Cost Basis	283,335
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	443,201
Commercial lending | Commercial and industrial (“C&I”) | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	964
Prior	261
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	1,225
Commercial lending | Commercial real estate (“CRE”)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	1,271,194
2019	2,911,788
2018	2,468,368
2017	1,446,468
2016	813,052
Prior	1,809,972
Revolving Loans Amortized Cost Basis	170,556
Revolving Loans Converted to Term Loans Amortized Cost Basis	10,716
Total	10,902,114	10,278,448
Commercial lending | Commercial real estate (“CRE”) | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	1,249,819
2019	2,859,844
2018	2,410,797
2017	1,380,086
2016	794,228
Prior	1,722,081
Revolving Loans Amortized Cost Basis	170,556
Revolving Loans Converted to Term Loans Amortized Cost Basis	10,716
Total	10,598,127
Commercial lending | Commercial real estate (“CRE”) | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	13,072
2019	0
2018	49,860
2017	22,468
2016	1,611
Prior	45,309
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	132,320
Commercial lending | Commercial real estate (“CRE”) | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	8,303
2019	51,944
2018	7,711
2017	43,914
2016	17,213
Prior	42,582
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	171,667
Commercial lending | Real estate loan | Multifamily residential
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	489,855
2019	1,066,230
2018	509,563
2017	414,771
2016	181,527
Prior	364,630
Revolving Loans Amortized Cost Basis	5,809
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	3,032,385	2,856,374
Commercial lending | Real estate loan | Multifamily residential | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	489,855
2019	1,045,053
2018	507,413
2017	414,771
2016	181,265
Prior	357,680
Revolving Loans Amortized Cost Basis	5,809
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	3,001,846
Commercial lending | Real estate loan | Multifamily residential | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	0
2019	20,433
2018	0
2017	0
2016	262
Prior	1,228
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	21,923
Commercial lending | Real estate loan | Multifamily residential | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	0
2019	744
2018	2,150
2017	0
2016	0
Prior	5,722
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	8,616
Commercial lending | Construction and land
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	49,996
2019	283,670
2018	185,570
2017	5,982
2016	21,636
Prior	20,862
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	567,716	628,499
Commercial lending | Construction and land | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	46,378
2019	283,670
2018	185,570
2017	5,982
2016	21,636
Prior	1,170
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	544,406
Commercial lending | Construction and land | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	3,618
2019	0
2018	0
2017	0
2016	0
Prior	19,692
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	23,310
Commercial lending | Total CRE
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	1,811,045
2019	4,261,688
2018	3,163,501
2017	1,867,221
2016	1,016,215
Prior	2,195,464
Revolving Loans Amortized Cost Basis	176,365
Revolving Loans Converted to Term Loans Amortized Cost Basis	10,716
Total	14,502,215	13,763,321
Consumer lending
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	1,154,260
2019	1,994,314
2018	1,707,642
2017	1,183,562
2016	603,974
Prior	1,213,910
Revolving Loans Amortized Cost Basis	1,274,845
Revolving Loans Converted to Term Loans Amortized Cost Basis	171,999
Total	9,304,506	8,864,287
Consumer lending | Real estate loan | Single-family residential
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	1,150,786
2019	1,989,055
2018	1,698,879
2017	1,166,652
2016	595,155
Prior	1,059,567
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	7,660,094	7,108,590
Consumer lending | Real estate loan | Single-family residential | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	1,150,786
2019	1,987,025
2018	1,694,022
2017	1,162,434
2016	593,501
Prior	1,047,965
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	7,635,733
Consumer lending | Real estate loan | Single-family residential | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	0
2019	637
2018	1,601
2017	836
2016	305
Prior	1,834
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	5,213
Consumer lending | Real estate loan | Single-family residential | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	0
2019	1,393
2018	3,256
2017	3,382
2016	1,349
Prior	9,768
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	19,148
Consumer lending | HELOCs
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	185
2019	987
2018	5,405
2017	12,581
2016	8,819
Prior	22,515
Revolving Loans Amortized Cost Basis	1,239,460
Revolving Loans Converted to Term Loans Amortized Cost Basis	171,999
Total	1,461,951	1,472,783
Consumer lending | HELOCs | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	185
2019	836
2018	4,417
2017	7,949
2016	7,511
Prior	18,097
Revolving Loans Amortized Cost Basis	1,239,458
Revolving Loans Converted to Term Loans Amortized Cost Basis	168,658
Total	1,447,111
Consumer lending | HELOCs | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	0
2019	0
2018	200
2017	0
2016	0
Prior	380
Revolving Loans Amortized Cost Basis	2
Revolving Loans Converted to Term Loans Amortized Cost Basis	190
Total	772
Consumer lending | HELOCs | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	0
2019	151
2018	788
2017	4,632
2016	1,308
Prior	4,038
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	3,151
Total	14,068
Consumer lending | Total residential mortgage
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	1,150,971
2019	1,990,042
2018	1,704,284
2017	1,179,233
2016	603,974
Prior	1,082,082
Revolving Loans Amortized Cost Basis	1,239,460
Revolving Loans Converted to Term Loans Amortized Cost Basis	171,999
Total	9,122,045	8,581,373
Consumer lending | Other consumer
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	3,289
2019	4,272
2018	3,358
2017	4,329
2016	0
Prior	131,828
Revolving Loans Amortized Cost Basis	35,385
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	182,461	282,914
Consumer lending | Other consumer | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	3,236
2019	4,272
2018	3,358
2017	1,838
2016	0
Prior	131,825
Revolving Loans Amortized Cost Basis	35,372
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	179,901
Consumer lending | Other consumer | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	51
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	51
Consumer lending | Other consumer | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
2020	2
2019	0
2018	0
2017	2,491
2016	0
Prior	3
Revolving Loans Amortized Cost Basis	13
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total	$ 2,509
Non-PCI Loans
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		34,555,668
Non-PCI Loans | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		33,582,886
Non-PCI Loans | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		515,702
Non-PCI Loans | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		440,105
Non-PCI Loans | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		16,975
Non-PCI Loans | Commercial lending
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		25,777,039
Non-PCI Loans | Commercial lending | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		24,836,765
Non-PCI Loans | Commercial lending | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		510,632
Non-PCI Loans | Commercial lending | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		412,667
Non-PCI Loans | Commercial lending | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		16,975
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		12,149,121
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		11,423,094
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		406,543
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		302,509
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		16,975
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		10,165,247
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		10,003,749
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		83,683
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		77,815
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		2,834,212
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		2,806,475
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		20,406
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		7,331
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
Non-PCI Loans | Commercial lending | Construction and land
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		628,459
Non-PCI Loans | Commercial lending | Construction and land | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		603,447
Non-PCI Loans | Commercial lending | Construction and land | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
Non-PCI Loans | Commercial lending | Construction and land | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		25,012
Non-PCI Loans | Commercial lending | Construction and land | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
Non-PCI Loans | Commercial lending | Total CRE
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		13,627,918
Non-PCI Loans | Commercial lending | Total CRE | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		13,413,671
Non-PCI Loans | Commercial lending | Total CRE | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		104,089
Non-PCI Loans | Commercial lending | Total CRE | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		110,158
Non-PCI Loans | Commercial lending | Total CRE | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
Non-PCI Loans | Consumer lending
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		8,778,629
Non-PCI Loans | Consumer lending | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		8,746,121
Non-PCI Loans | Consumer lending | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		5,070
Non-PCI Loans | Consumer lending | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		27,438
Non-PCI Loans | Consumer lending | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		7,028,979
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		7,012,522
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		2,278
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		14,179
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
Non-PCI Loans | Consumer lending | HELOCs
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		1,466,736
Non-PCI Loans | Consumer lending | HELOCs | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		1,453,207
Non-PCI Loans | Consumer lending | HELOCs | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		2,787
Non-PCI Loans | Consumer lending | HELOCs | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		10,742
Non-PCI Loans | Consumer lending | HELOCs | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
Non-PCI Loans | Consumer lending | Total residential mortgage
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		8,495,715
Non-PCI Loans | Consumer lending | Total residential mortgage | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		8,465,729
Non-PCI Loans | Consumer lending | Total residential mortgage | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		5,065
Non-PCI Loans | Consumer lending | Total residential mortgage | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		24,921
Non-PCI Loans | Consumer lending | Total residential mortgage | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
Non-PCI Loans | Consumer lending | Other consumer
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		282,914
Non-PCI Loans | Consumer lending | Other consumer | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		280,392
Non-PCI Loans | Consumer lending | Other consumer | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		5
Non-PCI Loans | Consumer lending | Other consumer | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		2,517
Non-PCI Loans | Consumer lending | Other consumer | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		222,871
PCD or PCI loans | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		211,635
PCD or PCI loans | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		11,236
PCD or PCI loans | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Commercial lending
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		137,213
PCD or PCI loans | Commercial lending | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		126,269
PCD or PCI loans | Commercial lending | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Commercial lending | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		10,944
PCD or PCI loans | Commercial lending | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		1,810
PCD or PCI loans | Commercial lending | Commercial and industrial (“C&I”) | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		1,810
PCD or PCI loans | Commercial lending | Commercial and industrial (“C&I”) | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Commercial lending | Commercial and industrial (“C&I”) | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Commercial lending | Commercial and industrial (“C&I”) | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Commercial lending | Commercial real estate (“CRE”)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		113,201
PCD or PCI loans | Commercial lending | Commercial real estate (“CRE”) | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		102,257
PCD or PCI loans | Commercial lending | Commercial real estate (“CRE”) | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Commercial lending | Commercial real estate (“CRE”) | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		10,944
PCD or PCI loans | Commercial lending | Commercial real estate (“CRE”) | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Commercial lending | Real estate loan | Multifamily residential
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		22,162
PCD or PCI loans | Commercial lending | Real estate loan | Multifamily residential | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		22,162
PCD or PCI loans | Commercial lending | Real estate loan | Multifamily residential | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Commercial lending | Real estate loan | Multifamily residential | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Commercial lending | Real estate loan | Multifamily residential | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Commercial lending | Construction and land
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		40
PCD or PCI loans | Commercial lending | Construction and land | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		40
PCD or PCI loans | Commercial lending | Construction and land | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Commercial lending | Construction and land | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Commercial lending | Construction and land | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Commercial lending | Total CRE
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		135,403
PCD or PCI loans | Commercial lending | Total CRE | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		124,459
PCD or PCI loans | Commercial lending | Total CRE | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Commercial lending | Total CRE | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		10,944
PCD or PCI loans | Commercial lending | Total CRE | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Consumer lending
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		85,658
PCD or PCI loans | Consumer lending | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		85,366
PCD or PCI loans | Consumer lending | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Consumer lending | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		292
PCD or PCI loans | Consumer lending | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Consumer lending | Real estate loan | Single-family residential
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		79,611
PCD or PCI loans | Consumer lending | Real estate loan | Single-family residential | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		79,517
PCD or PCI loans | Consumer lending | Real estate loan | Single-family residential | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Consumer lending | Real estate loan | Single-family residential | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		94
PCD or PCI loans | Consumer lending | Real estate loan | Single-family residential | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Consumer lending | HELOCs
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		6,047
PCD or PCI loans | Consumer lending | HELOCs | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		5,849
PCD or PCI loans | Consumer lending | HELOCs | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Consumer lending | HELOCs | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		198
PCD or PCI loans | Consumer lending | HELOCs | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Consumer lending | Total residential mortgage
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		85,658
PCD or PCI loans | Consumer lending | Total residential mortgage | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		85,366
PCD or PCI loans | Consumer lending | Total residential mortgage | Special Mention
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Consumer lending | Total residential mortgage | Substandard
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		292
PCD or PCI loans | Consumer lending | Total residential mortgage | Doubtful
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		0
PCD or PCI loans | Consumer lending | Other consumer
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Total		$ 0

X

- Definition Financing Receivable, Revolving Converted to Term Loans + References No definition available. + Details Name: ewbc_FinancingReceivableRevolvingConvertedtoTermLoans Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of financing receivable originated more than five years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447 + Details Name: us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of financing receivable originated four years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447 + Details Name: us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of financing receivable originated in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447 + Details Name: us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of financing receivable originated in fiscal year prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 + Details Name: us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of financing receivable originated three years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447 + Details Name: us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of financing receivable originated two years prior to current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447 + Details Name: us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_FinancingReceivableRecordedInvestmentLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of financing receivable that can be withdrawn, repaid and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 + Details Name: us-gaap_FinancingReceivableRevolving Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 + Details Name: us-gaap_NotesReceivableGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Details Name: us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_CommercialAndIndustrialLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_MultifamilyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_ConstructionAndLandLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_TotalCommercialRealEstateMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_SingleFamilyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_TotalResidentialMortgageMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_OtherConsumerMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_CreditLossStatusAxis=ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Loans Receivable and Allowance for Credit Losses (Amortized Cost of Loans on Nonaccrual Status) (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	$ 141,019
Commercial lending
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	120,988
Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	66,109
Commercial lending | Commercial real estate (“CRE”)
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	54,879
Commercial lending | Total CRE
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	54,879
Consumer lending
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	20,031
Consumer lending | HELOCs
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	8,898
Consumer lending | Total residential mortgage
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	17,540
Consumer lending | Other consumer
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	2,491
Single-family residential | Consumer lending | Real estate loan
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	$ 8,642

X

- Definition Amount of financing receivable on nonaccrual status with no allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 + Details Name: us-gaap_FinancingReceivableNonaccrualNoAllowance Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_FinancingReceivableNonaccrualStatusLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_CommercialAndIndustrialLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_TotalCommercialRealEstateMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_TotalResidentialMortgageMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_OtherConsumerMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_SingleFamilyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Loans Receivable and Allowance for Credit Losses (Aging Analysis on Loans Held-for-Investment) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	$ 113,150
Total Nonaccrual Loans	178,820
Current Accruing Loans	36,937,442
Total	37,229,412	$ 34,778,539
Accruing Loans 30-59  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	90,421
Accruing Loans 60-89  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	22,729
Nonaccrual Loans Less Than 90  Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	58,695
Nonaccrual Loans 90 or More Days  Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	120,125
Commercial lending
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	74,826
Total Nonaccrual Loans	142,174
Current Accruing Loans	27,707,906
Total	27,924,906	25,914,252
Commercial lending | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	60,136
Total Nonaccrual Loans	84,823
Current Accruing Loans	13,277,732
Total	13,422,691	12,150,931
Commercial lending | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	8,727
Total Nonaccrual Loans	56,577
Current Accruing Loans	10,836,810
Total	10,902,114	10,278,448
Commercial lending | Real estate loan | Multifamily residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	5,963
Total Nonaccrual Loans	774
Current Accruing Loans	3,025,648
Total	3,032,385	2,856,374
Commercial lending | Construction and land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0
Total Nonaccrual Loans	0
Current Accruing Loans	567,716
Total	567,716	628,499
Commercial lending | Total CRE
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	14,690
Total Nonaccrual Loans	57,351
Current Accruing Loans	14,430,174
Total	14,502,215	13,763,321
Commercial lending | Accruing Loans 30-59  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	57,881
Commercial lending | Accruing Loans 30-59  Days Past Due | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	46,774
Commercial lending | Accruing Loans 30-59  Days Past Due | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	7,452
Commercial lending | Accruing Loans 30-59  Days Past Due | Real estate loan | Multifamily residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	3,655
Commercial lending | Accruing Loans 30-59  Days Past Due | Construction and land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0
Commercial lending | Accruing Loans 30-59  Days Past Due | Total CRE
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	11,107
Commercial lending | Accruing Loans 60-89  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	16,945
Commercial lending | Accruing Loans 60-89  Days Past Due | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	13,362
Commercial lending | Accruing Loans 60-89  Days Past Due | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,275
Commercial lending | Accruing Loans 60-89  Days Past Due | Real estate loan | Multifamily residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,308
Commercial lending | Accruing Loans 60-89  Days Past Due | Construction and land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0
Commercial lending | Accruing Loans 60-89  Days Past Due | Total CRE
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	3,583
Commercial lending | Nonaccrual Loans Less Than 90  Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	56,539
Commercial lending | Nonaccrual Loans Less Than 90  Days Past Due | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	54,555
Commercial lending | Nonaccrual Loans Less Than 90  Days Past Due | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	1,210
Commercial lending | Nonaccrual Loans Less Than 90  Days Past Due | Real estate loan | Multifamily residential
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	774
Commercial lending | Nonaccrual Loans Less Than 90  Days Past Due | Construction and land
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0
Commercial lending | Nonaccrual Loans Less Than 90  Days Past Due | Total CRE
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	1,984
Commercial lending | Nonaccrual Loans 90 or More Days  Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	85,635
Commercial lending | Nonaccrual Loans 90 or More Days  Past Due | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	30,268
Commercial lending | Nonaccrual Loans 90 or More Days  Past Due | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	55,367
Commercial lending | Nonaccrual Loans 90 or More Days  Past Due | Real estate loan | Multifamily residential
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0
Commercial lending | Nonaccrual Loans 90 or More Days  Past Due | Construction and land
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0
Commercial lending | Nonaccrual Loans 90 or More Days  Past Due | Total CRE
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	55,367
Consumer lending
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	38,324
Total Nonaccrual Loans	36,646
Current Accruing Loans	9,229,536
Total	9,304,506	8,864,287
Consumer lending | Real estate loan | Single-family residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	20,691
Total Nonaccrual Loans	20,070
Current Accruing Loans	7,619,333
Total	7,660,094	7,108,590
Consumer lending | HELOCs
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,938
Total Nonaccrual Loans	14,068
Current Accruing Loans	1,444,945
Total	1,461,951	1,472,783
Consumer lending | Total residential mortgage
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	23,629
Total Nonaccrual Loans	34,138
Current Accruing Loans	9,064,278
Total	9,122,045	8,581,373
Consumer lending | Other consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	14,695
Total Nonaccrual Loans	2,508
Current Accruing Loans	165,258
Total	182,461	282,914
Consumer lending | Accruing Loans 30-59  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	32,540
Consumer lending | Accruing Loans 30-59  Days Past Due | Real estate loan | Single-family residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	15,739
Consumer lending | Accruing Loans 30-59  Days Past Due | HELOCs
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,165
Consumer lending | Accruing Loans 30-59  Days Past Due | Total residential mortgage
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	17,904
Consumer lending | Accruing Loans 30-59  Days Past Due | Other consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	14,636
Consumer lending | Accruing Loans 60-89  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	5,784
Consumer lending | Accruing Loans 60-89  Days Past Due | Real estate loan | Single-family residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	4,952
Consumer lending | Accruing Loans 60-89  Days Past Due | HELOCs
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	773
Consumer lending | Accruing Loans 60-89  Days Past Due | Total residential mortgage
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	5,725
Consumer lending | Accruing Loans 60-89  Days Past Due | Other consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	59
Consumer lending | Nonaccrual Loans Less Than 90  Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	2,156
Consumer lending | Nonaccrual Loans Less Than 90  Days Past Due | Real estate loan | Single-family residential
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	1,713
Consumer lending | Nonaccrual Loans Less Than 90  Days Past Due | HELOCs
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	443
Consumer lending | Nonaccrual Loans Less Than 90  Days Past Due | Total residential mortgage
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	2,156
Consumer lending | Nonaccrual Loans Less Than 90  Days Past Due | Other consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0
Consumer lending | Nonaccrual Loans 90 or More Days  Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	34,490
Consumer lending | Nonaccrual Loans 90 or More Days  Past Due | Real estate loan | Single-family residential
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	18,357
Consumer lending | Nonaccrual Loans 90 or More Days  Past Due | HELOCs
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	13,625
Consumer lending | Nonaccrual Loans 90 or More Days  Past Due | Total residential mortgage
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	31,982
Consumer lending | Nonaccrual Loans 90 or More Days  Past Due | Other consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	$ 2,508
Non-PCI Loans
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		101,283
Total Nonaccrual Loans		120,219
Current Accruing Loans		34,334,166
Total		34,555,668
Non-PCI Loans | Accruing Loans 30-59  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		73,871
Non-PCI Loans | Accruing Loans 60-89  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		27,412
Non-PCI Loans | Nonaccrual Loans Less Than 90  Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		35,570
Non-PCI Loans | Nonaccrual Loans 90 or More Days  Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		84,649
Non-PCI Loans | Commercial lending
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		73,691
Total Nonaccrual Loans		92,095
Current Accruing Loans		25,611,253
Total		25,777,039
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		48,155
Total Nonaccrual Loans		74,835
Current Accruing Loans		12,026,131
Total		12,149,121
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		24,807
Total Nonaccrual Loans		16,441
Current Accruing Loans		10,123,999
Total		10,165,247
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		729
Total Nonaccrual Loans		819
Current Accruing Loans		2,832,664
Total		2,834,212
Non-PCI Loans | Commercial lending | Construction and land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		0
Total Nonaccrual Loans		0
Current Accruing Loans		628,459
Total		628,459
Non-PCI Loans | Commercial lending | Total CRE
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		25,536
Total Nonaccrual Loans		17,260
Current Accruing Loans		13,585,122
Total		13,627,918
Non-PCI Loans | Commercial lending | Accruing Loans 30-59  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		54,149
Non-PCI Loans | Commercial lending | Accruing Loans 30-59  Days Past Due | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		31,121
Non-PCI Loans | Commercial lending | Accruing Loans 30-59  Days Past Due | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		22,830
Non-PCI Loans | Commercial lending | Accruing Loans 30-59  Days Past Due | Real estate loan | Multifamily residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		198
Non-PCI Loans | Commercial lending | Accruing Loans 30-59  Days Past Due | Construction and land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		0
Non-PCI Loans | Commercial lending | Accruing Loans 30-59  Days Past Due | Total CRE
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		23,028
Non-PCI Loans | Commercial lending | Accruing Loans 60-89  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		19,542
Non-PCI Loans | Commercial lending | Accruing Loans 60-89  Days Past Due | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		17,034
Non-PCI Loans | Commercial lending | Accruing Loans 60-89  Days Past Due | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		1,977
Non-PCI Loans | Commercial lending | Accruing Loans 60-89  Days Past Due | Real estate loan | Multifamily residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		531
Non-PCI Loans | Commercial lending | Accruing Loans 60-89  Days Past Due | Construction and land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		0
Non-PCI Loans | Commercial lending | Accruing Loans 60-89  Days Past Due | Total CRE
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		2,508
Non-PCI Loans | Commercial lending | Nonaccrual Loans Less Than 90  Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		32,158
Non-PCI Loans | Commercial lending | Nonaccrual Loans Less Than 90  Days Past Due | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		31,084
Non-PCI Loans | Commercial lending | Nonaccrual Loans Less Than 90  Days Past Due | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		540
Non-PCI Loans | Commercial lending | Nonaccrual Loans Less Than 90  Days Past Due | Real estate loan | Multifamily residential
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		534
Non-PCI Loans | Commercial lending | Nonaccrual Loans Less Than 90  Days Past Due | Construction and land
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		0
Non-PCI Loans | Commercial lending | Nonaccrual Loans Less Than 90  Days Past Due | Total CRE
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		1,074
Non-PCI Loans | Commercial lending | Nonaccrual Loans 90 or More Days  Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		59,937
Non-PCI Loans | Commercial lending | Nonaccrual Loans 90 or More Days  Past Due | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		43,751
Non-PCI Loans | Commercial lending | Nonaccrual Loans 90 or More Days  Past Due | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		15,901
Non-PCI Loans | Commercial lending | Nonaccrual Loans 90 or More Days  Past Due | Real estate loan | Multifamily residential
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		285
Non-PCI Loans | Commercial lending | Nonaccrual Loans 90 or More Days  Past Due | Construction and land
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		0
Non-PCI Loans | Commercial lending | Nonaccrual Loans 90 or More Days  Past Due | Total CRE
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		16,186
Non-PCI Loans | Consumer lending
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		27,592
Total Nonaccrual Loans		28,124
Current Accruing Loans		8,722,913
Total		8,778,629
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		20,517
Total Nonaccrual Loans		14,865
Current Accruing Loans		6,993,597
Total		7,028,979
Non-PCI Loans | Consumer lending | HELOCs
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		7,064
Total Nonaccrual Loans		10,742
Current Accruing Loans		1,448,930
Total		1,466,736
Non-PCI Loans | Consumer lending | Total residential mortgage
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		27,581
Total Nonaccrual Loans		25,607
Current Accruing Loans		8,442,527
Total		8,495,715
Non-PCI Loans | Consumer lending | Other consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		11
Total Nonaccrual Loans		2,517
Current Accruing Loans		280,386
Total		282,914
Non-PCI Loans | Consumer lending | Accruing Loans 30-59  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		19,722
Non-PCI Loans | Consumer lending | Accruing Loans 30-59  Days Past Due | Real estate loan | Single-family residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		15,443
Non-PCI Loans | Consumer lending | Accruing Loans 30-59  Days Past Due | HELOCs
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		4,273
Non-PCI Loans | Consumer lending | Accruing Loans 30-59  Days Past Due | Total residential mortgage
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		19,716
Non-PCI Loans | Consumer lending | Accruing Loans 30-59  Days Past Due | Other consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		6
Non-PCI Loans | Consumer lending | Accruing Loans 60-89  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		7,870
Non-PCI Loans | Consumer lending | Accruing Loans 60-89  Days Past Due | Real estate loan | Single-family residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		5,074
Non-PCI Loans | Consumer lending | Accruing Loans 60-89  Days Past Due | HELOCs
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		2,791
Non-PCI Loans | Consumer lending | Accruing Loans 60-89  Days Past Due | Total residential mortgage
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		7,865
Non-PCI Loans | Consumer lending | Accruing Loans 60-89  Days Past Due | Other consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans		5
Non-PCI Loans | Consumer lending | Nonaccrual Loans Less Than 90  Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		3,412
Non-PCI Loans | Consumer lending | Nonaccrual Loans Less Than 90  Days Past Due | Real estate loan | Single-family residential
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		1,964
Non-PCI Loans | Consumer lending | Nonaccrual Loans Less Than 90  Days Past Due | HELOCs
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		1,448
Non-PCI Loans | Consumer lending | Nonaccrual Loans Less Than 90  Days Past Due | Total residential mortgage
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		3,412
Non-PCI Loans | Consumer lending | Nonaccrual Loans Less Than 90  Days Past Due | Other consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		0
Non-PCI Loans | Consumer lending | Nonaccrual Loans 90 or More Days  Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		24,712
Non-PCI Loans | Consumer lending | Nonaccrual Loans 90 or More Days  Past Due | Real estate loan | Single-family residential
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		12,901
Non-PCI Loans | Consumer lending | Nonaccrual Loans 90 or More Days  Past Due | HELOCs
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		9,294
Non-PCI Loans | Consumer lending | Nonaccrual Loans 90 or More Days  Past Due | Total residential mortgage
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		22,195
Non-PCI Loans | Consumer lending | Nonaccrual Loans 90 or More Days  Past Due | Other consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans		$ 2,517

X

- Definition Amount of financing receivable not past due. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953401-111524 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919253-210447 + Details Name: us-gaap_FinancingReceivableRecordedInvestmentCurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount of financing receivable on nonaccrual status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 + Details Name: us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount of financing receivable past due. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919253-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953401-111524 + Details Name: us-gaap_FinancingReceivableRecordedInvestmentPastDue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 + Details Name: us-gaap_NotesReceivableGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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X

- Details Name: us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_CommercialAndIndustrialLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_MultifamilyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_ConstructionAndLandLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_TotalCommercialRealEstateMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

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X

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X

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X

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X

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X

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v3.20.2

Loans Receivable and Allowance for Credit Losses (Loans Receivable Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Nonaccrual loans
Loans on nonaccrual status	$ 178,820
Foreclosed assets
Foreclosed assets	23,400	$ 1,300
Residential real estate properties
Foreclosed assets
Recorded investment in consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process	$ 6,300	7,200
PCI Loans
Nonaccrual loans
Loans on nonaccrual status		$ 297

X

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X

- References No definition available. + Details Name: us-gaap_FinancingReceivableRecordedInvestmentAgingAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of financing receivable on nonaccrual status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 + Details Name: us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL49126937-111524 + Details Name: us-gaap_MortgageLoansInProcessOfForeclosureAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_OtherRealEstateAndForeclosedAssetsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_CollateralAxis=us-gaap_ResidentialRealEstateMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Loans Receivable and Allowance for Credit Losses (Additions to TDRs) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan
Loans Modified as TDRs
Number of Loans | loan	3		6
Pre- Modification Outstanding Recorded Investment	$ 35,260		$ 51,708
Post- Modification Outstanding Recorded Investment	28,926		43,833
Financial Impact	$ 872		$ 1,000
Commercial lending
Loans Modified as TDRs
Number of Loans | loan	3		6
Pre- Modification Outstanding Recorded Investment	$ 35,260		$ 51,708
Post- Modification Outstanding Recorded Investment	28,926		43,833
Financial Impact	$ 872		$ 1,000
Commercial lending | Commercial and industrial (“C&I”)
Loans Modified as TDRs
Number of Loans | loan	3		6
Pre- Modification Outstanding Recorded Investment	$ 35,260		$ 51,708
Post- Modification Outstanding Recorded Investment	28,926		43,833
Financial Impact	$ 872		$ 1,000
Consumer lending
Loans Modified as TDRs
Number of Loans | loan	0		0
Pre- Modification Outstanding Recorded Investment	$ 0		$ 0
Post- Modification Outstanding Recorded Investment	0		0
Financial Impact	$ 0		$ 0
Consumer lending | Real estate loan | Single-family residential
Loans Modified as TDRs
Number of Loans | loan	0		0
Pre- Modification Outstanding Recorded Investment	$ 0		$ 0
Post- Modification Outstanding Recorded Investment	0		0
Financial Impact	$ 0		$ 0
Consumer lending | Total residential mortgage
Loans Modified as TDRs
Number of Loans | loan	0		0
Pre- Modification Outstanding Recorded Investment	$ 0		$ 0
Post- Modification Outstanding Recorded Investment	0		0
Financial Impact	$ 0		$ 0
Non-PCI Loans
Loans Modified as TDRs
Number of Loans | loan		7		10
Pre- Modification Outstanding Recorded Investment		$ 48,319		$ 77,470
Post- Modification Outstanding Recorded Investment		48,273		77,705
Financial Impact		$ 5,869		$ 5,929
Non-PCI Loans | Commercial lending
Loans Modified as TDRs
Number of Loans | loan		6		9
Pre- Modification Outstanding Recorded Investment		$ 48,099		$ 77,250
Post- Modification Outstanding Recorded Investment		48,054		77,486
Financial Impact		$ 5,869		$ 5,929
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
Loans Modified as TDRs
Number of Loans | loan		6		9
Pre- Modification Outstanding Recorded Investment		$ 48,099		$ 77,250
Post- Modification Outstanding Recorded Investment		48,054		77,486
Financial Impact		$ 5,869		$ 5,929
Non-PCI Loans | Consumer lending
Loans Modified as TDRs
Number of Loans | loan		1		1
Pre- Modification Outstanding Recorded Investment		$ 220		$ 220
Post- Modification Outstanding Recorded Investment		219		219
Financial Impact		$ 0		$ 0
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential
Loans Modified as TDRs
Number of Loans | loan		1		1
Pre- Modification Outstanding Recorded Investment		$ 220		$ 220
Post- Modification Outstanding Recorded Investment		219		219
Financial Impact		$ 0		$ 0
Non-PCI Loans | Consumer lending | Total residential mortgage
Loans Modified as TDRs
Number of Loans | loan		1		1
Pre- Modification Outstanding Recorded Investment		$ 220		$ 220
Post- Modification Outstanding Recorded Investment		219		219
Financial Impact		$ 0		$ 0

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_FinancingReceivableModificationsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details Name: us-gaap_FinancingReceivableModificationsNumberOfContracts2 Namespace Prefix: us-gaap_ Data Type: xbrli:integerItemType Balance Type: na Period Type: duration

X

- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details Name: us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details Name: us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details Name: us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Details Name: us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

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X

- Details Name: us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_SingleFamilyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_TotalResidentialMortgageMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_CreditLossStatusAxis=ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Loans Receivable and Allowance for Credit Losses (TDR Post-Modification) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	$ 28,926		$ 43,833
Principal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	11,766		15,898
Principal and Interest
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment			10,775
Interest Deferments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	17,160		17,160
Commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	28,926		43,833
Commercial lending | Principal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	11,766		15,898
Commercial lending | Principal and Interest
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment			10,775
Commercial lending | Interest Deferments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	17,160		17,160
Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	28,926		43,833
Commercial lending | Commercial and industrial (“C&I”) | Principal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	11,766		15,898
Commercial lending | Commercial and industrial (“C&I”) | Principal and Interest
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment			10,775
Commercial lending | Commercial and industrial (“C&I”) | Interest Deferments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	17,160		17,160
Consumer lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	0		0
Consumer lending | Principal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	0		0
Consumer lending | Principal and Interest
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment			0
Consumer lending | Interest Deferments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	0		0
Consumer lending | Real estate loan | Single-family residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	0		0
Consumer lending | Real estate loan | Single-family residential | Principal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	0		0
Consumer lending | Real estate loan | Single-family residential | Principal and Interest
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment			0
Consumer lending | Real estate loan | Single-family residential | Interest Deferments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	0		0
Consumer lending | Total residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	0		0
Consumer lending | Total residential mortgage | Principal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	0		0
Consumer lending | Total residential mortgage | Principal and Interest
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment			0
Consumer lending | Total residential mortgage | Interest Deferments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment	$ 0		$ 0
Non-PCI Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		$ 48,273		$ 77,705
Non-PCI Loans | Principal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		9,909		39,341
Non-PCI Loans | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		38,364		38,364
Non-PCI Loans | Commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		48,054		77,486
Non-PCI Loans | Commercial lending | Principal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		9,909		39,341
Non-PCI Loans | Commercial lending | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		38,145		38,145
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		48,054		77,486
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Principal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		9,909		39,341
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		38,145		38,145
Non-PCI Loans | Consumer lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		219		219
Non-PCI Loans | Consumer lending | Principal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		0		0
Non-PCI Loans | Consumer lending | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		219		219
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		219		219
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential | Principal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		0		0
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		219		219
Non-PCI Loans | Consumer lending | Total residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		219		219
Non-PCI Loans | Consumer lending | Total residential mortgage | Principal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		0		0
Non-PCI Loans | Consumer lending | Total residential mortgage | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post- Modification Outstanding Recorded Investment		$ 219		$ 219

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_FinancingReceivableModificationsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details Name: us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

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X

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X

- Details Name: us-gaap_LoanRestructuringModificationAxis=ewbc_InterestDefermentsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

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X

- Details Name: us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_SingleFamilyMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_TotalResidentialMortgageMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_CreditLossStatusAxis=ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_LoanRestructuringModificationAxis=ewbc_OtherModificationMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Loans Receivable and Allowance for Credit Losses (Loans Modified as TDRs that Subsequently Defaulted) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan	Dec. 31, 2019 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1		1
Recorded Investment	$ 17,160		$ 17,160
Additional funds committed to lend to borrowers whose terms have been modified	$ 4,500		$ 4,500		$ 2,200
Commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1		1
Recorded Investment	$ 17,160		$ 17,160
Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1		1
Recorded Investment	$ 17,160		$ 17,160
Non-PCI Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1		1
Recorded Investment		$ 1,484		$ 1,484
Non-PCI Loans | Commercial lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1		1
Recorded Investment		$ 1,484		$ 1,484
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan		1		1
Recorded Investment		$ 1,484		$ 1,484

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_FinancingReceivableModificationsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524 + Details Name: us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 Namespace Prefix: us-gaap_ Data Type: xbrli:integerItemType Balance Type: na Period Type: duration

X

- Definition Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524 + Details Name: us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554 + Details Name: us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Details Name: us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_CommercialAndIndustrialLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_CreditLossStatusAxis=ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Loans Receivable and Allowance for Credit Losses (Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Impaired loans disclosures
Allowance for loan losses			$ 632,071		$ 358,287
Commercial and industrial (“C&I”)
Impaired loans disclosures
Allowance for loan losses			756
HELOCs
Impaired loans disclosures
Allowance for loan losses			76
Commercial lending
Impaired loans disclosures
Collateral dependent loan			88,100
Commercial lending | Commercial and industrial (“C&I”)
Impaired loans disclosures
Allowance for loan losses	$ 205,503	$ 205,503	380,723	$ 362,629	238,376	$ 189,757	$ 189,117
Commercial lending | Commercial real estate (“CRE”)
Impaired loans disclosures
Allowance for loan losses	39,811	39,811	176,040	132,819	40,509	39,224	40,666
Commercial lending | Real estate loan | Multifamily residential
Impaired loans disclosures
Allowance for loan losses	19,280	19,280	25,058	16,530	22,826	19,169	19,885
Commercial lending | Construction and land
Impaired loans disclosures
Allowance for loan losses	22,961	22,961	18,551	11,018	19,404	22,349	20,290
Consumer lending
Impaired loans disclosures
Collateral dependent loan			23,800
Consumer lending | Real estate loan | Single-family residential
Impaired loans disclosures
Allowance for loan losses	32,763	32,763	25,314	26,822	28,527	35,759	31,340
Consumer lending | HELOCs
Impaired loans disclosures
Allowance for loan losses	6,177	6,177	3,867	3,881	5,265	7,401	5,774
Consumer lending | Other consumer
Impaired loans disclosures
Allowance for loan losses	4,130	4,130	$ 2,518	$ 3,304	3,380	$ 4,235	$ 4,250
Non-PCI Loans
Impaired loans disclosures
Unpaid Principal Balance					266,772
Recorded Investment With No Allowance					129,748
Recorded Investment With Allowance					68,369
Total Recorded Investment					198,117
Related Allowance					5,593
Average Recorded Investment	257,108	269,604
Recognized Interest Income	1,444	2,500
Allowance for loan losses					358,287
Non-PCI Loans | Commercial lending
Impaired loans disclosures
Unpaid Principal Balance					226,918
Recorded Investment With No Allowance					115,116
Recorded Investment With Allowance					44,699
Total Recorded Investment					159,815
Related Allowance					3,033
Average Recorded Investment	217,782	226,892
Recognized Interest Income	1,277	2,186
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
Impaired loans disclosures
Unpaid Principal Balance					174,656
Recorded Investment With No Allowance					73,956
Recorded Investment With Allowance					40,086
Total Recorded Investment					114,042
Related Allowance					2,881
Average Recorded Investment	182,689	189,553
Recognized Interest Income	1,081	1,816
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”)
Impaired loans disclosures
Unpaid Principal Balance					27,601
Recorded Investment With No Allowance					20,098
Recorded Investment With Allowance					1,520
Total Recorded Investment					21,618
Related Allowance					97
Average Recorded Investment	29,241	31,456
Recognized Interest Income	135	249
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential
Impaired loans disclosures
Unpaid Principal Balance					4,965
Recorded Investment With No Allowance					1,371
Recorded Investment With Allowance					3,093
Total Recorded Investment					4,464
Related Allowance					55
Average Recorded Investment	5,852	5,883
Recognized Interest Income	61	121
Non-PCI Loans | Commercial lending | Construction and land
Impaired loans disclosures
Unpaid Principal Balance					19,696
Recorded Investment With No Allowance					19,691
Recorded Investment With Allowance					0
Total Recorded Investment					19,691
Related Allowance					0
Non-PCI Loans | Commercial lending | Total CRE
Impaired loans disclosures
Unpaid Principal Balance					52,262
Recorded Investment With No Allowance					41,160
Recorded Investment With Allowance					4,613
Total Recorded Investment					45,773
Related Allowance					152
Average Recorded Investment	35,093	37,339
Recognized Interest Income	196	370
Non-PCI Loans | Consumer lending
Impaired loans disclosures
Unpaid Principal Balance					39,854
Recorded Investment With No Allowance					14,632
Recorded Investment With Allowance					23,670
Total Recorded Investment					38,302
Related Allowance					2,560
Average Recorded Investment	39,326	42,712
Recognized Interest Income	167	314
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential
Impaired loans disclosures
Unpaid Principal Balance					23,626
Recorded Investment With No Allowance					8,507
Recorded Investment With Allowance					13,704
Total Recorded Investment					22,211
Related Allowance					35
Average Recorded Investment	23,247	24,865
Recognized Interest Income	129	258
Non-PCI Loans | Consumer lending | HELOCs
Impaired loans disclosures
Unpaid Principal Balance					13,711
Recorded Investment With No Allowance					6,125
Recorded Investment With Allowance					7,449
Total Recorded Investment					13,574
Related Allowance					8
Average Recorded Investment	13,564	15,321
Recognized Interest Income	38	56
Non-PCI Loans | Consumer lending | Total residential mortgage
Impaired loans disclosures
Unpaid Principal Balance					37,337
Recorded Investment With No Allowance					14,632
Recorded Investment With Allowance					21,153
Total Recorded Investment					35,785
Related Allowance					43
Average Recorded Investment	36,811	40,186
Recognized Interest Income	167	314
Non-PCI Loans | Consumer lending | Other consumer
Impaired loans disclosures
Unpaid Principal Balance					2,517
Recorded Investment With No Allowance					0
Recorded Investment With Allowance					2,517
Total Recorded Investment					2,517
Related Allowance					$ 2,517
Average Recorded Investment	2,515	2,526
Recognized Interest Income	$ 0	$ 0

X

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X

- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLosses Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_FinancingReceivableImpairedLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524 + Details Name: us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 + Details Name: us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524 + Details Name: us-gaap_ImpairedFinancingReceivableRecordedInvestment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 + Details Name: us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of investment in impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524 + Details Name: us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524 + Details Name: us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

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X

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v3.20.2

Loans Receivable and Allowance for Credit Losses (Summary of Activities in Allowance for Loan Losses by Portfolio Segments and Unfunded Credit Commitments) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019		Dec. 31, 2018
Financing Receivable Allowance for Credit Losses
Accounting Standards Update [Extensible List]			us-gaap:AccountingStandardsUpdate201613Member		us-gaap:AccountingStandardsUpdate201613Member	[1]	us-gaap:AccountingStandardsUpdate201602Member	[2]
Allowance for loan losses by portfolio segments
Allowance, beginning of period			$ 358,287,000
Provision for credit losses	$ 102,443,000	$ 19,245,000	176,313,000	$ 41,824,000
Gross charge-offs	0	(317,000)	0	(390,000)
Allowance, end of period	632,071,000		632,071,000		$ 358,287,000
Allowance for unfunded credit commitments
Provision for (reversal of) credit losses on unfunded credit commitments	102,443,000	19,245,000	176,313,000	41,824,000
PCD or PCI loans
Allowance for loan losses by portfolio segments
Allowance, beginning of period			0
Allowance, end of period					0
Commercial and industrial (“C&I”)
Allowance for loan losses by portfolio segments
Allowance, end of period	756,000		756,000
HELOCs
Allowance for loan losses by portfolio segments
Allowance, end of period	76,000		76,000
Unfunded Credit Commitments
Allowance for loan losses by portfolio segments
Provision for credit losses	8,143,000	(1,486,000)	7,357,000	453,000
Allowance for unfunded credit commitments
Allowance for Unfunded Credit Commitments	20,829,000	14,505,000	11,158,000	12,566,000	12,566,000
Provision for (reversal of) credit losses on unfunded credit commitments	8,143,000	(1,486,000)	7,357,000	453,000
Allowance for Unfunded Credit Commitments	28,972,000	13,019,000	28,972,000	13,019,000	11,158,000		$ 12,566,000
Unfunded Credit Commitments | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for unfunded credit commitments
Allowance for Unfunded Credit Commitments	0	0	10,457,000	0	0
Allowance for Unfunded Credit Commitments					10,457,000		0
Commercial lending | Commercial and industrial (“C&I”)
Allowance for loan losses by portfolio segments
Allowance, beginning of period	362,629,000	189,757,000	238,376,000	189,117,000	189,117,000
Provision for credit losses	37,862,000	26,140,000	98,480,000	41,404,000
Gross charge-offs	(20,378,000)	(11,745,000)	(32,355,000)	(28,989,000)
Gross recoveries	602,000	1,713,000	2,177,000	3,964,000
Total net (charge-offs) recoveries	(19,776,000)	(10,032,000)	(30,178,000)	(25,025,000)
Foreign currency translation adjustments	8,000	(362,000)	(192,000)	7,000
Allowance, end of period	380,723,000	205,503,000	380,723,000	205,503,000	238,376,000		189,117,000
Allowance for unfunded credit commitments
Provision for (reversal of) credit losses on unfunded credit commitments	37,862,000	26,140,000	98,480,000	41,404,000
Commercial lending | Commercial and industrial (“C&I”) | PCD or PCI loans
Allowance for loan losses by portfolio segments
Allowance, beginning of period			0
Allowance, end of period					0
Commercial lending | Commercial and industrial (“C&I”) | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for loan losses by portfolio segments
Allowance, beginning of period			74,237,000
Allowance, end of period					74,237,000
Commercial lending | Commercial and industrial (“C&I”) | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses by portfolio segments
Allowance, beginning of period			312,613,000
Allowance, end of period					312,613,000
Commercial lending | Commercial real estate (“CRE”)
Allowance for loan losses by portfolio segments
Allowance, beginning of period	132,819,000	39,224,000	40,509,000	40,666,000	40,666,000
Provision for credit losses	43,315,000	(1,250,000)	54,750,000	(2,914,000)
Gross charge-offs	(320,000)	0	(1,274,000)	0
Gross recoveries	226,000	1,837,000	9,886,000	2,059,000
Total net (charge-offs) recoveries	(94,000)	1,837,000	8,612,000	2,059,000
Foreign currency translation adjustments	0		0	0
Allowance, end of period	176,040,000	39,811,000	176,040,000	39,811,000	40,509,000		40,666,000
Allowance for unfunded credit commitments
Provision for (reversal of) credit losses on unfunded credit commitments	43,315,000	(1,250,000)	54,750,000	(2,914,000)
Commercial lending | Commercial real estate (“CRE”) | PCD or PCI loans
Allowance for loan losses by portfolio segments
Allowance, beginning of period			0
Allowance, end of period					0
Commercial lending | Commercial real estate (“CRE”) | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for loan losses by portfolio segments
Allowance, beginning of period			72,169,000
Allowance, end of period					72,169,000
Commercial lending | Commercial real estate (“CRE”) | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses by portfolio segments
Allowance, beginning of period			112,678,000
Allowance, end of period					112,678,000
Commercial lending | Real estate loan | Multifamily residential
Allowance for loan losses by portfolio segments
Allowance, beginning of period	16,530,000	19,169,000	22,826,000	19,885,000	19,885,000
Provision for credit losses	7,908,000	58,000	9,189,000	(939,000)
Gross charge-offs	0	0	0	0
Gross recoveries	620,000	53,000	1,155,000	334,000
Total net (charge-offs) recoveries	620,000	53,000	1,155,000	334,000
Foreign currency translation adjustments	0		0	0
Allowance, end of period	25,058,000	19,280,000	25,058,000	19,280,000	22,826,000		19,885,000
Allowance for unfunded credit commitments
Provision for (reversal of) credit losses on unfunded credit commitments	7,908,000	58,000	9,189,000	(939,000)
Commercial lending | Real estate loan | Multifamily residential | PCD or PCI loans
Allowance for loan losses by portfolio segments
Allowance, beginning of period			0
Allowance, end of period					0
Commercial lending | Real estate loan | Multifamily residential | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for loan losses by portfolio segments
Allowance, beginning of period			(8,112,000)
Allowance, end of period					(8,112,000)
Commercial lending | Real estate loan | Multifamily residential | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses by portfolio segments
Allowance, beginning of period			14,714,000
Allowance, end of period					14,714,000
Commercial lending | Construction and land
Allowance for loan losses by portfolio segments
Allowance, beginning of period	11,018,000	22,349,000	19,404,000	20,290,000	20,290,000
Provision for credit losses	7,526,000	173,000	9,008,000	2,169,000
Gross charge-offs	0	0	0	0
Gross recoveries	7,000	439,000	28,000	502,000
Total net (charge-offs) recoveries	7,000	439,000	28,000	502,000
Foreign currency translation adjustments	0		0	0
Allowance, end of period	18,551,000	22,961,000	18,551,000	22,961,000	19,404,000		20,290,000
Allowance for unfunded credit commitments
Provision for (reversal of) credit losses on unfunded credit commitments	7,526,000	173,000	9,008,000	2,169,000
Commercial lending | Construction and land | PCD or PCI loans
Allowance for loan losses by portfolio segments
Allowance, beginning of period			0
Allowance, end of period					0
Commercial lending | Construction and land | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for loan losses by portfolio segments
Allowance, beginning of period			(9,889,000)
Allowance, end of period					(9,889,000)
Commercial lending | Construction and land | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses by portfolio segments
Allowance, beginning of period			9,515,000
Allowance, end of period					9,515,000
Consumer lending | Real estate loan | Single-family residential
Allowance for loan losses by portfolio segments
Allowance, beginning of period	26,822,000	35,759,000	28,527,000	31,340,000	31,340,000
Provision for credit losses	(1,667,000)	(3,068,000)	33,000	1,349,000
Gross charge-offs	0	0	0	0
Gross recoveries	159,000	72,000	424,000	74,000
Total net (charge-offs) recoveries	159,000	72,000	424,000	74,000
Foreign currency translation adjustments	0		0	0
Allowance, end of period	25,314,000	32,763,000	25,314,000	32,763,000	28,527,000		31,340,000
Allowance for unfunded credit commitments
Provision for (reversal of) credit losses on unfunded credit commitments	(1,667,000)	(3,068,000)	33,000	1,349,000
Consumer lending | Real estate loan | Single-family residential | PCD or PCI loans
Allowance for loan losses by portfolio segments
Allowance, beginning of period			0
Allowance, end of period					0
Consumer lending | Real estate loan | Single-family residential | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for loan losses by portfolio segments
Allowance, beginning of period			(3,670,000)
Allowance, end of period					(3,670,000)
Consumer lending | Real estate loan | Single-family residential | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses by portfolio segments
Allowance, beginning of period			24,857,000
Allowance, end of period					24,857,000
Consumer lending | HELOCs
Allowance for loan losses by portfolio segments
Allowance, beginning of period	3,881,000	7,401,000	5,265,000	5,774,000	5,774,000
Provision for credit losses	205,000	(1,224,000)	617,000	401,000
Gross charge-offs	(221,000)	0	(221,000)	0
Gross recoveries	2,000	0	4,000	2,000
Total net (charge-offs) recoveries	(219,000)	0	(217,000)	2,000
Foreign currency translation adjustments	0		0	0
Allowance, end of period	3,867,000	6,177,000	3,867,000	6,177,000	5,265,000		5,774,000
Allowance for unfunded credit commitments
Provision for (reversal of) credit losses on unfunded credit commitments	205,000	(1,224,000)	617,000	401,000
Consumer lending | HELOCs | PCD or PCI loans
Allowance for loan losses by portfolio segments
Allowance, beginning of period			0
Allowance, end of period					0
Consumer lending | HELOCs | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for loan losses by portfolio segments
Allowance, beginning of period			(1,798,000)
Allowance, end of period					(1,798,000)
Consumer lending | HELOCs | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses by portfolio segments
Allowance, beginning of period			3,467,000
Allowance, end of period					3,467,000
Consumer lending | Other consumer
Allowance for loan losses by portfolio segments
Allowance, beginning of period	3,304,000	4,235,000	3,380,000	4,250,000	4,250,000
Provision for credit losses	(849,000)	(98,000)	(3,121,000)	(99,000)
Gross charge-offs	(30,000)	(14,000)	(56,000)	(28,000)
Gross recoveries	93,000	7,000	94,000	7,000
Total net (charge-offs) recoveries	63,000	(7,000)	38,000	(21,000)
Foreign currency translation adjustments	0		0	0
Allowance, end of period	2,518,000	4,130,000	2,518,000	4,130,000	3,380,000		4,250,000
Allowance for unfunded credit commitments
Provision for (reversal of) credit losses on unfunded credit commitments	(849,000)	(98,000)	(3,121,000)	(99,000)
Consumer lending | Other consumer | PCD or PCI loans
Allowance for loan losses by portfolio segments
Allowance, beginning of period			0
Allowance, end of period					0
Consumer lending | Other consumer | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for loan losses by portfolio segments
Allowance, beginning of period			2,221,000
Allowance, end of period					2,221,000
Consumer lending | Other consumer | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses by portfolio segments
Allowance, beginning of period			5,601,000
Allowance, end of period					5,601,000
Commercial and consumer lending
Allowance for loan losses by portfolio segments
Allowance, beginning of period	557,003,000	317,894,000	358,287,000	311,322,000	311,322,000
Provision for credit losses	94,300,000	20,731,000	168,956,000	41,371,000
Gross charge-offs	(20,949,000)	(11,759,000)	(33,906,000)	(29,017,000)
Gross recoveries	1,709,000	4,121,000	13,768,000	6,942,000
Total net (charge-offs) recoveries	(19,240,000)	(7,638,000)	(20,138,000)	(22,075,000)
Foreign currency translation adjustments	8,000	(362,000)	(192,000)	7,000
Allowance, end of period	632,071,000	330,625,000	632,071,000	330,625,000	358,287,000		$ 311,322,000
Allowance for unfunded credit commitments
Provision for (reversal of) credit losses on unfunded credit commitments	$ 94,300,000	$ 20,731,000	168,956,000	$ 41,371,000
Commercial and consumer lending | Cumulative Effect, Period Of Adoption, Adjustment
Allowance for loan losses by portfolio segments
Allowance, beginning of period			125,158,000
Allowance, end of period					125,158,000
Commercial and consumer lending | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses by portfolio segments
Allowance, beginning of period			$ 483,445,000
Allowance, end of period					$ 483,445,000
[1] Represents the impact of the adoption of ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) in the first quarter of 2020. Refer to Note 2 — Current Accounting Developments and Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Quarterly Report on Form 10-Q (“this Form 10-Q”) for additional information. [2] Represents the impact of the adoption of Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842) and subsequent related ASUs in the first quarter of 2019.

X

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X

- Definition Financing Receivable, Allowance for Credit Loss, Write Off, Net Of Recovery + References No definition available. + Details Name: ewbc_FinancingReceivableAllowanceForCreditLossWriteOffNetOfRecovery Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases allowance for credit loss on financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLossForeignCurrencyTranslation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLosses Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details Name: us-gaap_ProvisionForLoanLeaseAndOtherLosses Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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v3.20.2

Loans Receivable and Allowance for Credit Losses (Allowance for Credit Losses Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable Allowance for Credit Losses
Allowance for loan losses	$ 632,071,000		$ 632,071,000				$ 358,287,000
Increase to allowance for loan losses				$ 273,800,000
Provision for credit losses	102,443,000	$ 19,245,000	176,313,000	41,824,000
Gross charge-offs	0	317,000	0	390,000
PCD or PCI loans
Financing Receivable Allowance for Credit Losses
Allowance for loan losses							0
Commercial and consumer lending
Financing Receivable Allowance for Credit Losses
Allowance for loan losses	632,071,000	330,625,000	632,071,000	330,625,000	$ 557,003,000		358,287,000	$ 317,894,000	$ 311,322,000
Provision for credit losses	94,300,000	20,731,000	168,956,000	41,371,000
Gross charge-offs	20,949,000	11,759,000	33,906,000	29,017,000
Commercial and industrial (“C&I”)
Financing Receivable Allowance for Credit Losses
Allowance for loan losses	756,000		756,000
Commercial and industrial (“C&I”) | Commercial lending
Financing Receivable Allowance for Credit Losses
Allowance for loan losses	380,723,000	205,503,000	380,723,000	205,503,000	$ 362,629,000		238,376,000	$ 189,757,000	$ 189,117,000
Provision for credit losses	37,862,000	26,140,000	98,480,000	41,404,000
Gross charge-offs	$ 20,378,000	$ 11,745,000	$ 32,355,000	$ 28,989,000
Commercial and industrial (“C&I”) | Commercial lending | PCD or PCI loans
Financing Receivable Allowance for Credit Losses
Allowance for loan losses							$ 0
ASU 2016-13
Financing Receivable Allowance for Credit Losses
Allowance for loan losses						$ 125,200,000
ASU 2016-13 | PCD or PCI loans
Financing Receivable Allowance for Credit Losses
Allowance for loan losses						$ 1,200,000

X

- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLosses Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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X

- Definition Amount of increase (decrease) in allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: na Period Type: duration

X

- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details Name: us-gaap_ProvisionForLoanLeaseAndOtherLosses Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

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- Details Name: us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201613Member Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Loans Receivable and Allowance for Credit Losses (Allowance for Loan Losses and Recorded Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Allowance for loan losses
Allowance for loan losses	$ 632,071		$ 632,071			$ 358,287
Recorded investment in loans
Loans held-for-investment	37,229,412		37,229,412			34,778,539
Provision for credit losses	102,443	$ 19,245	176,313	$ 41,824
Commercial and industrial (“C&I”)
Allowance for loan losses
Allowance for loan losses	756		756
HELOCs
Allowance for loan losses
Allowance for loan losses	76		76
Commercial lending
Recorded investment in loans
Loans held-for-investment	27,924,906		27,924,906			25,914,252
Commercial lending | Commercial and industrial (“C&I”)
Allowance for loan losses
Allowance for loan losses	380,723	205,503	380,723	205,503	$ 362,629	238,376	$ 189,757	$ 189,117
Recorded investment in loans
Loans held-for-investment	13,422,691		13,422,691			12,150,931
Provision for credit losses	37,862	26,140	98,480	41,404
Total net (charge-offs) recoveries	19,776	10,032	30,178	25,025
Commercial lending | Commercial real estate (“CRE”)
Allowance for loan losses
Allowance for loan losses	176,040	39,811	176,040	39,811	132,819	40,509	39,224	40,666
Recorded investment in loans
Loans held-for-investment	10,902,114		10,902,114			10,278,448
Provision for credit losses	43,315	(1,250)	54,750	(2,914)
Total net (charge-offs) recoveries	94	(1,837)	(8,612)	(2,059)
Commercial lending | Real estate loan | Multifamily residential
Allowance for loan losses
Allowance for loan losses	25,058	19,280	25,058	19,280	16,530	22,826	19,169	19,885
Recorded investment in loans
Loans held-for-investment	3,032,385		3,032,385			2,856,374
Provision for credit losses	7,908	58	9,189	(939)
Total net (charge-offs) recoveries	(620)	(53)	(1,155)	(334)
Commercial lending | Construction and land
Allowance for loan losses
Allowance for loan losses	18,551	22,961	18,551	22,961	11,018	19,404	22,349	20,290
Recorded investment in loans
Loans held-for-investment	567,716		567,716			628,499
Provision for credit losses	7,526	173	9,008	2,169
Total net (charge-offs) recoveries	(7)	(439)	(28)	(502)
Consumer lending
Recorded investment in loans
Loans held-for-investment	9,304,506		9,304,506			8,864,287
Consumer lending | Real estate loan | Single-family residential
Allowance for loan losses
Allowance for loan losses	25,314	32,763	25,314	32,763	26,822	28,527	35,759	31,340
Recorded investment in loans
Loans held-for-investment	7,660,094		7,660,094			7,108,590
Provision for credit losses	(1,667)	(3,068)	33	1,349
Total net (charge-offs) recoveries	(159)	(72)	(424)	(74)
Consumer lending | HELOCs
Allowance for loan losses
Allowance for loan losses	3,867	6,177	3,867	6,177	3,881	5,265	7,401	5,774
Recorded investment in loans
Loans held-for-investment	1,461,951		1,461,951			1,472,783
Provision for credit losses	205	(1,224)	617	401
Total net (charge-offs) recoveries	219	0	217	(2)
Consumer lending | Other consumer
Allowance for loan losses
Allowance for loan losses	2,518	4,130	2,518	4,130	3,304	3,380	4,235	4,250
Recorded investment in loans
Loans held-for-investment	182,461		182,461			282,914
Provision for credit losses	(849)	(98)	(3,121)	(99)
Total net (charge-offs) recoveries	(63)	7	(38)	21
Commercial and consumer lending
Allowance for loan losses
Allowance for loan losses	632,071	330,625	632,071	330,625	$ 557,003	358,287	$ 317,894	$ 311,322
Recorded investment in loans
Provision for credit losses	94,300	20,731	168,956	41,371
Total net (charge-offs) recoveries	$ 19,240	$ 7,638	$ 20,138	$ 22,075
Non-PCI Loans
Allowance for loan losses
Individually evaluated for impairment						5,593
Collectively evaluated for impairment						352,694
Allowance for loan losses						358,287
Recorded investment in loans
Individually evaluated for impairment						198,117
Collectively evaluated for impairment						34,357,551
Loans held-for-investment						34,555,668
Non-PCI Loans | Commercial lending
Allowance for loan losses
Individually evaluated for impairment						3,033
Recorded investment in loans
Loans held-for-investment						25,777,039
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
Allowance for loan losses
Individually evaluated for impairment						2,881
Collectively evaluated for impairment						235,495
Recorded investment in loans
Individually evaluated for impairment						114,042
Collectively evaluated for impairment						12,035,079
Loans held-for-investment						12,149,121
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”)
Allowance for loan losses
Individually evaluated for impairment						97
Collectively evaluated for impairment						40,412
Recorded investment in loans
Individually evaluated for impairment						21,618
Collectively evaluated for impairment						10,143,629
Loans held-for-investment						10,165,247
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily residential
Allowance for loan losses
Individually evaluated for impairment						55
Collectively evaluated for impairment						22,771
Recorded investment in loans
Individually evaluated for impairment						4,464
Collectively evaluated for impairment						2,829,748
Loans held-for-investment						2,834,212
Non-PCI Loans | Commercial lending | Construction and land
Allowance for loan losses
Individually evaluated for impairment						0
Collectively evaluated for impairment						19,404
Recorded investment in loans
Individually evaluated for impairment						19,691
Collectively evaluated for impairment						608,768
Loans held-for-investment						628,459
Non-PCI Loans | Consumer lending
Allowance for loan losses
Individually evaluated for impairment						2,560
Recorded investment in loans
Loans held-for-investment						8,778,629
Non-PCI Loans | Consumer lending | Real estate loan | Single-family residential
Allowance for loan losses
Individually evaluated for impairment						35
Collectively evaluated for impairment						28,492
Recorded investment in loans
Individually evaluated for impairment						22,211
Collectively evaluated for impairment						7,006,768
Loans held-for-investment						7,028,979
Non-PCI Loans | Consumer lending | HELOCs
Allowance for loan losses
Individually evaluated for impairment						8
Collectively evaluated for impairment						5,257
Recorded investment in loans
Individually evaluated for impairment						13,574
Collectively evaluated for impairment						1,453,162
Loans held-for-investment						1,466,736
Non-PCI Loans | Consumer lending | Other consumer
Allowance for loan losses
Individually evaluated for impairment						2,517
Collectively evaluated for impairment						863
Recorded investment in loans
Individually evaluated for impairment						2,517
Collectively evaluated for impairment						280,397
Loans held-for-investment						282,914
PCI Loans
Allowance for loan losses
Allowance for loan losses						0
Recorded investment in loans
Loans held-for-investment						222,871
PCI Loans | Commercial lending
Recorded investment in loans
Loans held-for-investment						137,213
PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
Allowance for loan losses
Allowance for loan losses						0
Recorded investment in loans
Loans held-for-investment						1,810
PCI Loans | Commercial lending | Commercial real estate (“CRE”)
Allowance for loan losses
Allowance for loan losses						0
Recorded investment in loans
Loans held-for-investment						113,201
PCI Loans | Commercial lending | Real estate loan | Multifamily residential
Allowance for loan losses
Allowance for loan losses						0
Recorded investment in loans
Loans held-for-investment						22,162
PCI Loans | Commercial lending | Construction and land
Allowance for loan losses
Allowance for loan losses						0
Recorded investment in loans
Loans held-for-investment						40
PCI Loans | Consumer lending
Recorded investment in loans
Loans held-for-investment						85,658
PCI Loans | Consumer lending | Real estate loan | Single-family residential
Allowance for loan losses
Allowance for loan losses						0
Recorded investment in loans
Loans held-for-investment						79,611
PCI Loans | Consumer lending | HELOCs
Allowance for loan losses
Allowance for loan losses						0
Recorded investment in loans
Loans held-for-investment						6,047
PCI Loans | Consumer lending | Other consumer
Allowance for loan losses
Allowance for loan losses						0
Recorded investment in loans
Loans held-for-investment						$ 0

X

- Definition Financing Receivable, Allowance for Credit Loss, Write Off, Net Of Recovery + References No definition available. + Details Name: ewbc_FinancingReceivableAllowanceForCreditLossWriteOffNetOfRecovery Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- References No definition available. + Details Name: ewbc_RecordedInvestmentInTotalLoansReceivableRelatedToEachBalanceInAllowanceForLoanLossesAbstract Namespace Prefix: ewbc_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- References No definition available. + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLossAdditionalInformationAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLosses Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details Name: us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details Name: us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 + Details Name: us-gaap_NotesReceivableGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details Name: us-gaap_ProvisionForLoanLeaseAndOtherLosses Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_CommercialAndIndustrialLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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X

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v3.20.2

Loans Receivable and Allowance for Credit Losses (Accretable Yield for PCI Loans) (Details) - PCD or PCI loans - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Changes in accretable yield for PCI loans
Accretable yield for PCI loans, beginning of period	$ 68,861	$ 74,870
Accretion	(5,806)	(12,007)
Changes in expected cash flows	998	1,190
Accretable yield for PCI loans, end of period	$ 64,053	$ 64,053

X

- Definition Represents the change in the estimate of cash flows expected to be collected. This relates to loans not accounted as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details Name: ewbc_ChangesInExpectedCashFlows Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121585399&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 + Details Name: us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of accretion recognized for the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121585399&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 + Details Name: us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldMovementScheduleRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Loans Receivable and Allowance for Credit Losses (Loan Purchases, Sales And Transfers Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Real estate loan | Single Family Residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-sale	$ 3,900	$ 434

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_AccountsNotesAndLoansReceivableLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120238483&loc=d3e48678-111004 + Details Name: us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Details Name: us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=ewbc_SingleFamilyResidentialMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Loans Receivable and Allowance for Credit Losses (Loan Purchases, Sales and Transfers) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	$ 33,060,000	$ 81,166,000	$ 143,283,000	$ 173,394,000
Sales	46,768,000	78,776,000	161,633,000	173,519,000
Purchases	12,510,000	178,471,000	145,690,000	326,285,000
Write-down of loans transferred from loans held-for-investment to loans held-for-sale recorded to allowance for loan losses	0	317,000	0	390,000
Net gains from sales of loans held-for-sale during the period	132,000	15,000	1,100,000	930,000
Commercial and industrial (“C&I”) | Originated
Loans Receivable and Allowance for Credit Losses
Sales		55,700,000		132,200,000
Commercial and industrial (“C&I”) | Single-family residential | Originated
Loans Receivable and Allowance for Credit Losses
Sales	46,800,000		161,600,000
Loans sold in secondary market | Purchased
Loans Receivable and Allowance for Credit Losses
Sales	0	23,100,000	0	41,300,000
Commercial lending | Commercial and industrial (“C&I”)
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	33,060,000	79,593,000	136,033,000	155,166,000
Sales	33,060,000	76,031,000	136,033,000	151,677,000
Purchases	12,503,000	159,100,000	143,086,000	266,294,000
Write-down of loans transferred from loans held-for-investment to loans held-for-sale recorded to allowance for loan losses	20,378,000	11,745,000	32,355,000	28,989,000
Commercial lending | Commercial real estate (“CRE”)
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	0	0	7,250,000	16,655,000
Sales	0	0	7,250,000	16,655,000
Purchases	0	0	0	0
Write-down of loans transferred from loans held-for-investment to loans held-for-sale recorded to allowance for loan losses	320,000	0	1,274,000	0
Commercial lending | Real estate loan | Multifamily residential
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	0	0	0	0
Sales	0	0	0	0
Purchases	7,000	1,734,000	1,520,000	5,952,000
Write-down of loans transferred from loans held-for-investment to loans held-for-sale recorded to allowance for loan losses	0	0	0	0
Commercial lending | Construction and land
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	0	1,573,000	0	1,573,000
Sales	0	1,573,000	0	1,573,000
Purchases	0	0	0	0
Write-down of loans transferred from loans held-for-investment to loans held-for-sale recorded to allowance for loan losses	0	0	0	0
Consumer lending | Real estate loan | Single-family residential
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	0	0	0	0
Sales	13,708,000	1,172,000	18,350,000	3,614,000
Purchases	0	17,637,000	1,084,000	54,039,000
Write-down of loans transferred from loans held-for-investment to loans held-for-sale recorded to allowance for loan losses	$ 0	$ 0	$ 0	$ 0

X

- References No definition available. + Details Name: us-gaap_AccountsNotesAndLoansReceivableClassifiedAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 + Details Name: us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of increase from purchase of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919244-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details Name: us-gaap_FinancingReceivableSignificantPurchases Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of decrease from sale and reclassification to held-for-sale of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919244-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details Name: us-gaap_FinancingReceivableSignificantSales Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans and leases that were sold during the reporting period. This element refers to the gain (loss) and not to the cash proceeds of the sales. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details Name: us-gaap_GainLossOnSaleOfLoansAndLeases Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 + Details Name: us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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v3.20.2

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities (Investments in Qualified Affordable Housing Partnerships, Net) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities [Abstract]
Minimum compliance period for qualified affordable housing partnerships to fully utilize the tax credits (in years)			15 years
Investments in qualified affordable housing partnerships, net	$ 201,888		$ 201,888		$ 207,037
Accrued expenses and other liabilities — Unfunded commitments	72,655		72,655		$ 80,294
Tax credits and other tax benefits recognized	11,772	$ 11,506	22,803	$ 23,332
Amortization expense included in income tax expense	$ 9,148	$ 9,657	$ 17,532	$ 18,554

X

- Definition Investments in Qualified Affordable Housing Partnerships, Net [Abstract] + References No definition available. + Details Name: ewbc_InvestmentsInQualifiedAffordableHousingPartnershipsTaxCreditAndOtherInvestmentsNetAndVariableInterestEntitiesAbstract Namespace Prefix: ewbc_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Represents the minimum compliance period, to meet regulatory requirements for affordable housing, to fully utilize the tax credits. + References No definition available. + Details Name: ewbc_MinimumCompliancePeriodToFullyUtilizeTaxCredits Namespace Prefix: ewbc_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

X

- Definition Amount of affordable housing tax credits and other tax benefits recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details Name: us-gaap_AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount of investment in qualified affordable housing projects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details Name: us-gaap_AmortizationMethodQualifiedAffordableHousingProjectInvestments Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of amortization expense of investment in qualified affordable housing projects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details Name: us-gaap_AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of commitment or contingent commitments to qualified affordable housing project investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details Name: us-gaap_QualifiedAffordableHousingProjectInvestmentsCommitment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

v3.20.2

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities (Investments in Tax Credit and Other Investments, Net) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) credit	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) credit	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Investments in Tax Credit and Other Investments, Net [Line Items]
Investments in tax credit and other investments, net	$ 251,318,000		$ 251,318,000		$ 254,140,000
Accrued expenses and other liabilities — Unfunded commitments	106,969,000		106,969,000		113,515,000
Amortization expense of tax credit and other investments	24,759,000	$ 16,739,000	42,084,000	$ 41,644,000
Unrealized gains recognized on equity securities with readily determinable fair values	720,000	375,000	758,000	767,000
Equity securities without readily determinable fair values	18,800,000		18,800,000		19,100,000
Adjustments to equity securities without readily determinable fair values	0	0	0	0
AFS debt securities	3,884,574,000		3,884,574,000		3,317,214,000
Collateralized loan obligations (“CLOs”)
Investments in Tax Credit and Other Investments, Net [Line Items]
AFS debt securities	273,979,000		273,979,000		284,706,000
Tax credit investments
Investments in Tax Credit and Other Investments, Net [Line Items]
Equity securities with readily determinable fair values	31,100,000		31,100,000		$ 31,700,000
Amortization of tax credit and other investments
Investments in Tax Credit and Other Investments, Net [Line Items]
Tax Credit Investments, Pre-tax Impairment Recovery	109,000	0	$ 259,000	0
OTTI charge	$ 733,000	$ 2,900,000		$ 9,900,000
Historic Tax Credit Investment
Investments in Tax Credit and Other Investments, Net [Line Items]
Number of recovered historic tax credit investments | credit	1		2
CRA Investment
Investments in Tax Credit and Other Investments, Net [Line Items]
Number of recovered historic tax credit investments | credit	1

X

- Definition Represents the net amount of investments in the projects, excluding affordable housing projects, that qualify for Community Reinvestment Act (CRA) credits or other types of tax credits. + References No definition available. + Details Name: ewbc_InvestmentsinTaxCreditandOtherInvestmentsNet Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition [Line Items] for Investments in Tax Credit and Other Investments, Net [Table] + References No definition available. + Details Name: ewbc_InvestmentsinTaxCreditandOtherInvestmentsNetLineItems Namespace Prefix: ewbc_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amortization of investments in projects that qualify for Community Reinvestment Act ("CRA") and other tax credits, included as a component of noninterest expense. + References No definition available. + Details Name: ewbc_NoninterestExpenseAmortizationofTaxCreditandOtherInvestments Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Number of Impaired or Recovered Tax Credit Investments + References No definition available. + Details Name: ewbc_NumberOfImpairedOrRecoveredTaxCreditInvestments Namespace Prefix: ewbc_ Data Type: xbrli:integerItemType Balance Type: na Period Type: duration

X

- Definition Amount of commitment or contingent commitments to investments in certain limited partnerships that qualify for Community Reinvestment Act (CRA) credits or other types of tax credits. + References No definition available. + Details Name: ewbc_OtherTaxCreditInvestmentsCommitment Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Tax Credit Investments, Pre-tax Impairment Charge + References No definition available. + Details Name: ewbc_TaxCreditInvestmentsPretaxImpairmentCharge Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Tax Credit Investments, Pre-tax Impairment (Charge) Recovery + References No definition available. + Details Name: ewbc_TaxCreditInvestmentsPretaxImpairmentChargeRecovery Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details Name: us-gaap_AvailableForSaleSecuritiesDebtSecurities Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details Name: us-gaap_EquitySecuritiesFvNi Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117539-209714 + Details Name: us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117539-209714 + Details Name: us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount of unrealized gain (loss) on investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details Name: us-gaap_MarketableSecuritiesUnrealizedGainLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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v3.20.2

Goodwill and Other Intangible Assets (Goodwill & Impairment Analysis) (Details)	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 465,697,000		$ 465,697,000	$ 465,697,000	$ 465,697,000	$ 465,547,000
Number of reportable segments | segment			3
Changes in the carrying amount of goodwill	0		$ 0
Goodwill, Impairment Loss	$ 0	$ 0	$ 0	$ 0

X

- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details Name: us-gaap_Goodwill Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- References No definition available. + Details Name: us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details Name: us-gaap_GoodwillImpairmentLoss Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details Name: us-gaap_GoodwillPeriodIncreaseDecrease Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: na Period Type: duration

X

- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details Name: us-gaap_NumberOfReportableSegments Namespace Prefix: us-gaap_ Data Type: xbrli:integerItemType Balance Type: na Period Type: duration

v3.20.2

Goodwill and Other Intangible Assets (Changes in the Carrying amount of Goodwill by Reporting Unit) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Goodwill [Line Items]
Beginning Balance	$ 465,547
Ending Balance	465,697
Acquisition of East West Capital Markets, LLC
Goodwill [Line Items]
Acquisition of East West Capital Markets, LLC	150
Consumer and Business Banking
Goodwill [Line Items]
Beginning Balance	353,321
Ending Balance	353,321
Consumer and Business Banking | Acquisition of East West Capital Markets, LLC
Goodwill [Line Items]
Acquisition of East West Capital Markets, LLC	0
Commercial Banking
Goodwill [Line Items]
Beginning Balance	112,226
Ending Balance	112,376
Commercial Banking | Acquisition of East West Capital Markets, LLC
Goodwill [Line Items]
Acquisition of East West Capital Markets, LLC	$ 150

X

- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details Name: us-gaap_Goodwill Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details Name: us-gaap_GoodwillAcquiredDuringPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_GoodwillLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Details Name: us-gaap_BusinessAcquisitionAxis=ewbc_EnstreamCapitalMarketsLLCMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ReportingUnitAxis=ewbc_ConsumerandBusinessBankingMember Namespace Prefix: Data Type: na Balance Type: Period Type:

X

- Details Name: us-gaap_ReportingUnitAxis=ewbc_CommercialBankingMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Goodwill and Other Intangible Assets (Core Deposit Intangibles) (Details) - Core Deposit Intangibles - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Impairment write downs on the core deposit intangibles	$ 0	$ 0	$ 0	$ 0
Gross balance	86,099,000		86,099,000		$ 86,099,000
Accumulated amortization	(77,972,000)		(77,972,000)		(76,088,000)
Net carrying balance	$ 8,127,000		$ 8,127,000		$ 10,011,000

X

- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_FiniteLivedIntangibleAssetsGross Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_FiniteLivedIntangibleAssetsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_FiniteLivedIntangibleAssetsNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details Name: us-gaap_ImpairmentOfIntangibleAssetsFinitelived Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Details Name: us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CoreDepositsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Goodwill and Other Intangible Assets (Amortization Expense of Core Deposit Intangibles and Estimated Future Amortization Expense ) (Details) - Core Deposit Intangibles - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 931	$ 1,100	$ 1,900	$ 2,300
Year Ended December 31,
Remainder of 2020	1,750		1,750
2021	2,749		2,749
2022	1,865		1,865
2023	1,199		1,199
2024	553		553
Thereafter	11		11
Net carrying balance	$ 8,127		$ 8,127		$ 10,011

X

- Definition Finite-Lived Intangible Assets, Expected Amortization, after Year Four + References No definition available. + Details Name: ewbc_FiniteLivedIntangibleAssetsExpectedAmortizationAfterYearFour Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details Name: us-gaap_AmortizationOfIntangibleAssets Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year. + References No definition available. + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details Name: us-gaap_FiniteLivedIntangibleAssetsNet Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Details Name: us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CoreDepositsMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Commitments and Contingencies (Credit-Related Commitments) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Loan commitments	$ 5,131,120	$ 5,330,211
Commercial letters of credit and SBLCs	$ 2,005,402	$ 1,860,414

X

- References No definition available. + Details Name: us-gaap_CommitmentsAndContingenciesDisclosureAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details Name: us-gaap_LettersOfCreditOutstandingAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details Name: us-gaap_UnusedCommitmentsToExtendCredit Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

v3.20.2

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Commitments to Extend Credit
Letters of credit	$ 2,005,402	$ 1,860,414
Accrued expenses and other liabilities
Commitments to Extend Credit
Allowance for unfunded credit commitments	28,900	11,100
Other Commitments
Unfunded commitments in investments in qualified affordable housing partnerships, tax credit and other investments	179,600	193,800
Single Family and Multi-family Residential Loans | Loans Sold or Securitized with Recourse | Accrued expenses and other liabilities | Loans Sold or Securitized With Recourse
Commitments to Extend Credit
Allowance for unfunded credit commitments	85	$ 76
Standby Letters of Credit
Commitments to Extend Credit
Letters of credit	1,930,000
Commercial Letters of Credit
Commitments to Extend Credit
Letters of credit	$ 72,300

X

- Definition Reflects the Allowance for Unfunded Credit Commitments + References No definition available. + Details Name: ewbc_AllowanceforUnfundedCreditCommitments Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details Name: us-gaap_LettersOfCreditOutstandingAmount Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_LossContingenciesLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details Name: us-gaap_OtherCommitment Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- References No definition available. + Details Name: us-gaap_OtherCommitmentsAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Details Name: us-gaap_BalanceSheetLocationAxis=ewbc_AccruedExpensesAndOtherLiabilitiesMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: us-gaap_FinancialInstrumentAxis=ewbc_CommercialLettersOfCreditMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Commitments and Contingencies (Guarantees Outstanding) (Details) - Loans Sold or Securitized With Recourse - Loans Sold or Securitized with Recourse - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Single Family Residential
Guarantees
Maximum Potential Future Payments	$ 11,501	$ 12,578
Carrying Value	11,501	12,578
Multifamily Residential
Guarantees
Maximum Potential Future Payments	15,682	15,892
Carrying Value	30,152	40,708
Single Family and Multi-family Residential Loans
Guarantees
Maximum Potential Future Payments	27,183	28,470
Carrying Value	$ 41,653	$ 53,286

X

- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details Name: us-gaap_GuaranteeObligationsCurrentCarryingValue Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details Name: us-gaap_GuaranteeObligationsMaximumExposure Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_LossContingenciesLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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v3.20.2

Revenue from Contracts with Customers (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 13,963,000	$ 13,407,000	$ 29,763,000	$ 26,649,000
Other sources of noninterest income	44,674,000	39,352,000	82,923,000	68,241,000
Total noninterest income	58,637,000	52,759,000	112,686,000	94,890,000
Contract assets	0		0		$ 0
Contract liabilities	0		0		$ 0
Consumer and Business Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9,496,000	9,709,000	20,951,000	19,370,000
Other sources of noninterest income	4,447,000	4,794,000	9,394,000	8,905,000
Total noninterest income	13,943,000	14,503,000	30,345,000	28,275,000
Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,426,000	3,688,000	8,765,000	7,253,000
Other sources of noninterest income	29,461,000	29,968,000	57,578,000	50,947,000
Total noninterest income	33,887,000	33,656,000	66,343,000	58,200,000
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	41,000	10,000	47,000	26,000
Other sources of noninterest income	10,766,000	4,590,000	15,951,000	8,389,000
Total noninterest income	10,807,000	4,600,000	15,998,000	8,415,000
Deposit service charges and related fee income
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,111,000	8,706,000	19,460,000	17,229,000
Deposit service charges and related fee income | Consumer and Business Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,166,000	5,397,000	11,710,000	10,630,000
Deposit service charges and related fee income | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,904,000	3,299,000	7,703,000	6,573,000
Deposit service charges and related fee income | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	41,000	10,000	47,000	26,000
Card income
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	761,000	901,000	1,859,000	1,846,000
Card income | Consumer and Business Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	639,000	747,000	1,537,000	1,507,000
Card income | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	122,000	154,000	322,000	339,000
Card income | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Wealth management fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,091,000	3,800,000	8,444,000	7,574,000
Wealth management fees | Consumer and Business Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,691,000	3,565,000	7,704,000	7,233,000
Wealth management fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	400,000	235,000	740,000	341,000
Wealth management fees | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	$ 0	$ 0	$ 0

X

- Definition Other sources of noninterest income not derived from contracts with customers. + References No definition available. + Details Name: ewbc_OtherSourcesOfNoninterestIncome Namespace Prefix: ewbc_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 + Details Name: us-gaap_ContractWithCustomerAssetGrossNoncurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

X

- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details Name: us-gaap_ContractWithCustomerLiabilityNoncurrent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

X

- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_DisaggregationOfRevenueLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details Name: us-gaap_NoninterestIncome Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details Name: us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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v3.20.2

Stock Compensation Plans (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	0	0
Time-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost	$ 31.4
Weighted average period to recognize unrecognized compensation cost	2 years 14 days
Time-Based RSUs | Cliff
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost	$ 19.6
Weighted average period to recognize unrecognized compensation cost	2 years 25 days
Performance-Based RSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential for awards to vest (as a percent)	0.00%
Performance-Based RSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential for awards to vest (as a percent)	200.00%
Performance-Based RSUs | Cliff
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years

X

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details Name: us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: instant

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details Name: us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 Namespace Prefix: us-gaap_ Data Type: xbrli:durationItemType Balance Type: na Period Type: duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

X

- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

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- Details Name: srt_RangeAxis=srt_MaximumMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Stock Compensation Plans (Summary of Total Share-Based Compensation Expense and Related Net Tax Benefits) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Total Stock Compensation Expense and Related Net Tax Benefit [Abstract]
Stock compensation costs	$ 7,071	$ 8,081	$ 14,280	$ 15,525
Related net tax (deficiencies) benefits for stock compensation plans	$ (9)	$ 1	$ (1,575)	$ 4,708

X

- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details Name: us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

X

- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details Name: us-gaap_ShareBasedCompensation Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

X

- References No definition available. + Details Name: us-gaap_ShareBasedCompensationAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

v3.20.2

Stock Compensation Plans (Summary of Activity for Time-Based and Performance-Based RSUs) (Details)	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Time-Based RSUs Settled in Shares
Shares
Outstanding, at beginning of period (in shares)	1,139,868
Granted (in shares)	657,461
Vested (in shares)	(251,526)
Forfeited (in shares)	(100,371)
Outstanding, at end of period (in shares)	1,445,432
Weighted-Average Grant Date Fair Value
Outstanding, at beginning of period (in dollars per share) | $ / shares	$ 57.78
Granted (in dollars per share) | $ / shares	40.51
Vested (in dollars per share) | $ / shares	54.47
Forfeited (in dollars per share) | $ / shares	54.33
Outstanding, at end of period (in dollars per share) | $ / shares	$ 50.74
Performance-Based RSUs Settled in Shares
Shares
Outstanding, at beginning of period (in shares)	386,483
Granted (in shares)	165,084
Vested (in shares)	(131,597)
Forfeited (in shares)	0
Outstanding, at end of period (in shares)	419,970
Weighted-Average Grant Date Fair Value
Outstanding, at beginning of period (in dollars per share) | $ / shares	$ 60.13
Granted (in dollars per share) | $ / shares	39.79
Vested (in dollars per share) | $ / shares	56.59
Forfeited (in dollars per share) | $ / shares	0
Outstanding, at end of period (in dollars per share) | $ / shares	$ 53.24
Time-Based RSUs Settled in Cash
Shares
Outstanding, at beginning of period (in shares)	11,638
Granted (in shares)	11,215
Vested (in shares)	(723)
Forfeited (in shares)	0
Outstanding, at end of period (in shares)	22,130

X

- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

X

- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

X

- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: duration

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: instant

X

- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue Namespace Prefix: us-gaap_ Data Type: num:perShareItemType Balance Type: na Period Type: instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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v3.20.2

Stockholders' Equity and Earnings Per Share (Earnings Per Share Calculation) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jan. 17, 2014	Jan. 16, 2014
Basic:
Net income	$ 99,352	$ 150,380	$ 244,176	$ 314,404
Basic weighted-average number of shares outstanding (in shares)	141,486,000	145,546,000	143,150,000	145,402,000
Basic EPS (in dollars per share)	$ 0.70	$ 1.03	$ 1.71	$ 2.16
Diluted:
Net income	$ 99,352	$ 150,380	$ 244,176	$ 314,404
Basic weighted-average number of shares outstanding (in shares)	141,486,000	145,546,000	143,150,000	145,402,000
Diluted potential common shares (in shares)	341,000	506,000	410,000	614,000
Diluted weighted-average number of shares outstanding (in shares)	141,827,000	146,052,000	143,560,000	146,016,000
Diluted EPS (in dollars per share)	$ 0.70	$ 1.03	$ 1.70	$ 2.15
Common Stock
Diluted:
Shares of common stock into which the warrant may be converted (in shares)					230,282
MetroCorp | MetroCorp
Diluted:
Shares of common stock into which the warrant may be converted (in shares)						771,429

X

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- References No definition available. + Details Name: us-gaap_EarningsPerShareDilutedAbstract Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22595-107794 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1377-109256 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 + Details Name: us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1505-109256 + Details Name: us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details Name: us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1505-109256 + Details Name: us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1448-109256 + Details Name: us-gaap_WeightedAverageNumberOfSharesOutstandingBasic Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

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- Details Name: us-gaap_BusinessAcquisitionAxis=ewbc_MetroCorpMember Namespace Prefix: Data Type: na Balance Type: Period Type:

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- Details Name: dei_LegalEntityAxis=ewbc_MetroCorpMember Namespace Prefix: Data Type: na Balance Type: Period Type:

v3.20.2

Stockholders' Equity and Earnings Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 03, 2020
Stockholders' Equity and Earnings Per Share [Abstract]
Stock repurchase program, amount authorized					$ 500.0
Repurchased by company (in shares)			4,471,682
Average price (in dollars per share)			$ 32.64
Total cost			$ 146.0
RSUs
Anti-dilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average anti-dilutive shares (in shares)	1,200,000	584,000	620,000	239,000

X

- Definition Stockholders' Equity and Earnings Per Share [Abstract] + References No definition available. + Details Name: ewbc_StockholdersEquityandEarningsPerShareAbstract Namespace Prefix: ewbc_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details Name: us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details Name: us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details Name: us-gaap_StockRepurchaseProgramAuthorizedAmount1 Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: instant

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details Name: us-gaap_StockRepurchasedDuringPeriodShares Namespace Prefix: us-gaap_ Data Type: xbrli:sharesItemType Balance Type: na Period Type: duration

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v3.20.2

Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 4,902,985	$ 4,591,930	$ 5,017,617	$ 4,423,974
Other comprehensive income	16,253	23,011	41,542	48,202
Ending balance	4,987,243	4,734,593	4,987,243	4,734,593
AFS Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	25,034	(23,810)	(2,419)	(45,821)
Net unrealized gains (losses) arising during the period	24,606	30,046	53,136	53,157
Amounts reclassified from AOCI	(6,790)	(1,019)	(7,867)	(2,119)
Other comprehensive income	17,816	29,027	45,269	51,038
Ending balance	42,850	5,217	42,850	5,217
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	0	0	0
Net unrealized gains (losses) arising during the period	(1,063)	0	(1,063)	0
Amounts reclassified from AOCI	(270)	0	(270)	0
Other comprehensive income	(1,333)	0	(1,333)	0
Ending balance	(1,333)	0	(1,333)	0
Foreign Currency Translation Adjustments, Net of Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(18,153)	(9,173)	(15,989)	(12,353)
Net unrealized gains (losses) arising during the period	(230)	(6,016)	(2,394)	(2,836)
Amounts reclassified from AOCI	0	0	0	0
Other comprehensive income	(230)	(6,016)	(2,394)	(2,836)
Ending balance	(18,383)	(15,189)	(18,383)	(15,189)
AOCI, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	6,881	(32,983)	(18,408)	(58,174)
Net unrealized gains (losses) arising during the period	23,313	24,030	49,679	50,321
Amounts reclassified from AOCI	(7,060)	(1,019)	(8,137)	(2,119)
Other comprehensive income	16,253	23,011	41,542	48,202
Ending balance	$ 23,134	$ (9,972)	$ 23,134	$ (9,972)

X

- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details Name: us-gaap_AOCIAttributableToParentNetOfTaxRollForward Namespace Prefix: us-gaap_ Data Type: xbrli:stringItemType Balance Type: na Period Type: duration

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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121640130&loc=d3e1436-108581 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details Name: us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669625-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669619-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 + Details Name: us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121640130&loc=d3e1436-108581 + Details Name: us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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v3.20.2

Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Before-Tax
Net change	$ 23,091	$ 40,095	$ 60,289	$ 72,652
Tax Effect
Net change	(6,838)	(17,084)	(18,747)	(24,450)
Net-of-Tax
Other comprehensive income	16,253	23,011	41,542	48,202
AFS Debt Securities
Before-Tax
Net unrealized gains arising during the period	34,970	44,531	75,463	75,469
Net realized (gains) reclassified into net income	(9,640)	(1,447)	(11,169)	(3,008)
Net change	25,330	43,084	64,294	72,461
Tax Effect
Net unrealized gains (losses) arising during the period	(10,364)	(14,485)	(22,327)	(22,312)
Net realized (gains) reclassified into net income	2,850	428	3,302	889
Net change	(7,514)	(14,057)	(19,025)	(21,423)
Net-of-Tax
Net unrealized gains (losses) arising during the period	24,606	30,046	53,136	53,157
Net realized (gains) reclassified into net income	(6,790)	(1,019)	(7,867)	(2,119)
Other comprehensive income	17,816	29,027	45,269	51,038
Cash Flow Hedges
Before-Tax
Net unrealized gains arising during the period	(1,483)	0	(1,483)	0
Net realized (gains) reclassified into net income	(377)	0	(377)	0
Net change	(1,860)	0	(1,860)	0
Tax Effect
Net unrealized gains (losses) arising during the period	420	0	420	0
Net realized (gains) reclassified into net income	107	0	107	0
Net change	527	0	527	0
Net-of-Tax
Net unrealized gains (losses) arising during the period	(1,063)	0	(1,063)	0
Net realized (gains) reclassified into net income	(270)	0	(270)	0
Other comprehensive income	(1,333)	0	(1,333)	0
Foreign Currency Translation Adjustments, Net of Hedges
Before-Tax
Net unrealized gains arising during the period	(379)	(2,989)	(2,145)	191
Net change	(379)	(2,989)	(2,145)	191
Tax Effect
Net unrealized gains (losses) arising during the period	149	(3,027)	(249)	(3,027)
Net change	149	(3,027)	(249)	(3,027)
Net-of-Tax
Net unrealized gains (losses) arising during the period	(230)	(6,016)	(2,394)	(2,836)
Net realized (gains) reclassified into net income	0	0	0	0
Other comprehensive income	$ (230)	$ (6,016)	$ (2,394)	$ (2,836)

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details Name: us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 + Details Name: us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: debit Period Type: duration

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- Definition Amount before tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 + Details Name: us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669625-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669619-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 + Details Name: us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent Namespace Prefix: us-gaap_ Data Type: xbrli:monetaryItemType Balance Type: credit Period Type: duration

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v3.20.2

Business Segments (Narrative) (Details)	6 Months Ended
	Jun. 30, 2020 segment
Segment Reporting [Abstract]
Number of reportable segments	3
Number of core segments	2
Number of operating segments	3

X

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v3.20.2

Business Segments (Operating Results and Other Key Financial Measures) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information
Net interest income before provision for credit losses	$ 343,775	$ 367,326	$ 706,482	$ 729,787
Provision for credit losses	102,443	19,245	176,313	41,824
Noninterest Income	58,637	52,759	112,686	94,890
Noninterest expense	187,696	177,663	366,572	364,585
Segment income before income taxes	112,273	223,177	276,283	418,268
Segment net income (loss)	99,352	150,380	244,176	314,404
Segment assets	49,407,593	42,892,358	49,407,593	42,892,358	$ 44,196,096
Consumer and Business Banking
Segment Reporting Information
Net interest income before provision for credit losses	124,926	180,911	277,517	365,970
Provision for credit losses	5,590	1,616	13,378	4,629
Noninterest Income	13,943	14,503	30,345	28,275
Noninterest expense	80,164	83,656	167,128	171,562
Segment income before income taxes	53,115	110,142	127,356	218,054
Segment net income (loss)	38,058	78,741	91,253	155,887
Segment assets	12,666,938	11,013,898	12,666,938	11,013,898
Commercial Banking
Segment Reporting Information
Net interest income before provision for credit losses	183,796	158,941	367,297	311,649
Provision for credit losses	96,853	17,629	162,935	37,195
Noninterest Income	33,887	33,656	66,343	58,200
Noninterest expense	64,900	67,303	135,026	137,847
Segment income before income taxes	55,930	107,665	135,679	194,807
Segment net income (loss)	40,178	76,885	97,309	139,219
Segment assets	26,984,013	25,001,894	26,984,013	25,001,894
Other
Segment Reporting Information
Net interest income before provision for credit losses	35,053	27,474	61,668	52,168
Provision for credit losses	0	0	0	0
Noninterest Income	10,807	4,600	15,998	8,415
Noninterest expense	42,632	26,704	64,418	55,176
Segment income before income taxes	3,228	5,370	13,248	5,407
Segment net income (loss)	21,116	(5,246)	55,614	19,298
Segment assets	$ 9,756,642	$ 6,876,566	$ 9,756,642	$ 6,876,566

X

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v3.20.2

Subsequent Events (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Aug. 17, 2020
Subsequent events
Dividends declared per common share (in dollars per share)	$ 0.275	$ 0.275	$ 0.550	$ 0.505
Subsequent Event
Subsequent events
Dividends Payable, Amount Per Share					$ 0.275

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