East West Bancorp (EWBC) 10-K 28 Feb 24 2023 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2023	Jan. 31, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	000-24939
Entity Registrant Name	EAST WEST BANCORP, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-4703316
Entity Address, Address Line One	135 North Los Robles Ave.
Entity Address, Address Line Two	7th Floor
Entity Address, City or Town	Pasadena
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91101
City Area Code	626
Local Phone Number	768-6000
Title of 12(b) Security	Common stock, par value $0.001 per share
Trading Symbol	EWBC
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Public Float			$ 7,396,326,818
Entity Common Stock, Shares Outstanding		140,030,010
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A relating to its 2024 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10-K.
Entity Central Index Key	0001069157
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2023
Auditor Information [Abstract]
Auditor Name	KPMG LLP
Auditor Location	Los Angeles, CA
Auditor Firm ID	185

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
ASSETS
Cash and due from banks	$ 444,793	$ 534,980
Interest-bearing cash with banks	4,170,191	2,946,804
Cash and cash equivalents	4,614,984	3,481,784
Interest-bearing deposits with banks	10,498	139,021
Assets purchased under resale agreements (“resale agreements”)	785,000	792,192
Securities:
Available-for-sale (“AFS”) debt securities, at fair value (amortized cost of $6,916,491 and $6,879,225)	6,188,337	6,034,993
Held-to-maturity (“HTM”) debt securities, at amortized cost (fair value of $2,453,971 and $2,455,171)	2,956,040	3,001,868
Loans held-for-sale	116	25,644
Loans held-for-investment (net of allowance for loan losses of $668,743 and $595,645)	51,542,039	47,606,785
Investments in qualified affordable housing partnerships, tax credit and other investments, net	905,036	763,256
Premises and equipment (net of accumulated depreciation of $157,622 and $148,126)	86,370	89,191
Goodwill	465,697	465,697
Operating lease right-of-use assets	94,024	103,681
Other assets	1,964,743	1,608,038
TOTAL	69,612,884	64,112,150
Deposits:
Noninterest-bearing	15,539,872	21,051,090
Interest-bearing	40,552,566	34,916,759
Total deposits	56,092,438	55,967,849
Short-term borrowings	4,500,000	0
Assets sold under repurchase agreements (“repurchase agreements”)	0	300,000
Long-term debt and finance lease liabilities	153,011	152,400
Operating lease liabilities	102,353	111,931
Accrued expenses and other liabilities	1,814,248	1,595,358
Total liabilities	62,662,050	58,127,538
COMMITMENTS AND CONTINGENCIES (Note 12)
STOCKHOLDERS’ EQUITY
Common stock, $0.001 par value, 200,000,000 shares authorized; 169,372,230 and 168,459,045 shares issued	169	168
Additional paid-in capital	1,980,818	1,936,389
Retained earnings	6,465,230	5,582,546
Treasury stock, at cost 29,344,863 and 27,511,199 shares	(874,787)	(768,862)
Accumulated other comprehensive loss (“AOCI”), net of tax	(620,596)	(765,629)
Total stockholders’ equity	6,950,834	5,984,612
TOTAL	$ 69,612,884	$ 64,112,150

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
ASSETS
ASF debt securities, amortized cost	$ 6,916,491	$ 6,879,225
HTM debt securities, fair value	2,453,971	2,455,171
Allowance for loan losses	668,743	595,645
Premises and equipment, accumulated depreciation	$ 157,622	$ 148,126
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)	169,372,230	168,459,045
Treasury stock, shares (in shares)	29,344,863	27,511,199

CONSOLIDATED STATEMENT OF INCOM

CONSOLIDATED STATEMENT OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
INTEREST AND DIVIDEND INCOME
Loans receivable, including fees	$ 3,172,746	$ 2,048,301	$ 1,424,900
Debt Securities	276,190	198,906	143,983
Resale agreements	20,164	29,767	32,239
Restricted equity securities	4,062	3,144	2,081
Interest-bearing cash and deposits with banks	220,643	41,113	15,531
Total interest and dividend income	3,693,805	2,321,231	1,618,734
INTEREST EXPENSE
Deposits	1,205,550	251,838	69,159
Federal funds purchased and other short-term borrowings	157,002	1,801	42
Federal Home Loan Bank (“FHLB”) advances	6,430	1,754	6,881
Repurchase agreements	1,497	14,362	7,999
Long-term debt and finance lease liabilities	11,072	5,595	3,082
Total interest expense	1,381,551	275,350	87,163
Net interest income before provision for (reversal of) credit losses	2,312,254	2,045,881	1,531,571
Provision for (reversal of) credit losses	125,000	73,500	(35,000)
Net interest income after provision for (reversal of) credit losses	2,187,254	1,972,381	1,566,571
NONINTEREST INCOME
Lending fees	83,876	79,208	77,704
Deposit account fees	89,606	88,435	71,261
Customer derivative income	20,200	29,057	22,913
Foreign exchange income	52,481	48,158	48,977
Wealth management fees	26,805	27,565	25,751
Net gains on sales of loans	3,634	6,411	8,909
Net (losses) gains on AFS debt securities	(6,862)	1,306	1,568
Other investment income	9,348	7,037	16,852
Other income	16,176	11,489	11,960
Total noninterest income	295,264	298,666	285,895
NONINTEREST EXPENSE
Compensation and employee benefits	508,538	477,635	433,728
Occupancy and equipment expense	62,763	62,501	62,996
Deposit insurance premiums and regulatory assessments	103,308	19,449	17,563
Deposit account expense	43,143	25,508	16,152
Computer software and data processing expenses	44,475	42,776	46,863
Other operating expense	140,222	118,166	96,330
Amortization of tax credit and other investments	120,299	113,358	122,457
Total noninterest expense	1,022,748	859,393	796,089
INCOME BEFORE INCOME TAXES	1,459,770	1,411,654	1,056,377
INCOME TAX EXPENSE	298,609	283,571	183,396
NET INCOME	$ 1,161,161	$ 1,128,083	$ 872,981
EARNINGS PER SHARE (“EPS”)
BASIC (in dollars per share)	$ 8.23	$ 7.98	$ 6.16
DILUTED (in dollars per share)	$ 8.18	$ 7.92	$ 6.10
WEIGHTED-AVERAGE NUMBER OF SHARES OUTSTANDING
BASIC (in shares)	141,164	141,326	141,826
DILUTED (in shares)	141,902	142,492	143,140

CONSOLIDATED STATEMENT OF COMPR

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 1,161,161	$ 1,128,083	$ 872,981
Other comprehensive income (loss), net of tax:
Net changes in unrealized gains (losses) on AFS debt securities	81,763	(508,799)	(137,950)
Reclassification of unrealized losses on debt securities transferred from AFS to HTM	0	(112,991)	0
Amortization of unrealized losses on debt securities transferred from ASF to HTM	11,171	12,678	0
Net changes in unrealized gains (losses) on cash flow hedges	52,155	(49,788)	1,487
Foreign currency translation adjustments	(56)	(16,348)	1,757
Other comprehensive income (loss)	145,033	(675,248)	(134,706)
COMPREHENSIVE INCOME	$ 1,306,194	$ 452,835	$ 738,275

CONSOLIDATED STATEMENT OF CHANG

CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands		Total	Stock Compensation Plans And Agreements, Various Plans and Agreements	Stock Repurchase Plan	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Common Stock Stock Compensation Plans And Agreements, Various Plans and Agreements	Common Stock Stock Repurchase Plan	Common Stock and Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Treasury Stock Stock Compensation Plans And Agreements, Various Plans and Agreements	Treasury Stock Stock Repurchase Plan	AOCI, Net of Tax
Beginning balance (in shares) at Dec. 31, 2020						141,565,229
Beginning balance at Dec. 31, 2020		$ 5,269,175							$ 1,858,519	$ 4,000,414		$ (634,083)			$ 44,325
Increase (Decrease) in Stockholders' Equity
Net income		872,981								872,981
Other comprehensive income (loss)		(134,706)													(134,706)
Issuance of common stock pursuant to various stock compensation plans and agreements (in shares)						550,045
Issuance of common stock pursuant to various stock compensation plans and agreements		35,206							35,206
Repurchase of common stock pursuant to the Stock Repurchase Program/various stock compensation plans and agreements (in shares)							(207,320)
Repurchase of common stock pursuant to the Stock Repurchase Program/various stock compensation plans and agreements			$ (15,702)										$ (15,702)
Cash dividends on common stock		(189,736)								(189,736)
Ending balance (in shares) at Dec. 31, 2021						141,907,954
Ending balance at Dec. 31, 2021		5,837,218							1,893,725	4,683,659		(649,785)			(90,381)
Increase (Decrease) in Stockholders' Equity
Net income		1,128,083								1,128,083
Other comprehensive income (loss)		(675,248)													(675,248)
Issuance of common stock pursuant to various stock compensation plans and agreements (in shares)						671,871
Issuance of common stock pursuant to various stock compensation plans and agreements		42,832							42,832
Repurchase of common stock pursuant to the Stock Repurchase Program/various stock compensation plans and agreements (in shares)							(246,462)	(1,385,517)
Repurchase of common stock pursuant to the Stock Repurchase Program/various stock compensation plans and agreements			(19,087)	$ (99,990)									(19,087)	$ (99,990)
Cash dividends on common stock		(229,196)								(229,196)
Ending balance (in shares) at Dec. 31, 2022						140,947,846
Ending balance at Dec. 31, 2022		5,984,612							1,936,557	5,582,546		(768,862)			(765,629)
Ending balance (Accounting Standards Update 2022-02) at Dec. 31, 2022	[1]				$ (4,262)						$ (4,262)
Increase (Decrease) in Stockholders' Equity
Net income		1,161,161								1,161,161
Other comprehensive income (loss)		145,033													145,033
Issuance of common stock pursuant to various stock compensation plans and agreements (in shares)						913,185
Issuance of common stock pursuant to various stock compensation plans and agreements		44,430							44,430
Repurchase of common stock pursuant to the Stock Repurchase Program/various stock compensation plans and agreements (in shares)							(327,573)	(1,506,091)
Repurchase of common stock pursuant to the Stock Repurchase Program/various stock compensation plans and agreements			$ (23,751)	$ (82,174)									$ (23,751)	$ (82,174)
Cash dividends on common stock		(274,215)								(274,215)
Ending balance (in shares) at Dec. 31, 2023						140,027,367
Ending balance at Dec. 31, 2023		$ 6,950,834							$ 1,980,987	$ 6,465,230		$ (874,787)			$ (620,596)
Increase (Decrease) in Stockholders' Equity
Accounting Standards Update [Extensible List]		Accounting Standards Update 2022-02
[1] Represents the change in the Company’s allowance for loan losses as a result of the adoption of Accounting Standards Update (“ASU”) 2022-02, Financial Instruments — Credit Losses (Topic 326) : Troubled Debt Restructurings and the Vintage Disclosures on January 1, 2023. Refer to Note 1 — Summary of Significant Accounting Policies to the Consolidated Financial Statements in this Annual Report on Form 10-K (“this Form 10-K”) for additional information.

CONSOLIDATED STATEMENT OF CHA_2

CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share (in dollars per share)	$ 1.92	$ 1.60	$ 1.32

CONSOLIDATED STATEMENT OF CASH

CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,161,161	$ 1,128,083	$ 872,981
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (reversal of) credit losses	125,000	73,500	(35,000)
Depreciation and amortization	163,460	159,851	156,792
Accretion of discount and (amortization of premiums), net	10,723	56,703	67,415
Stock compensation costs	39,867	37,601	32,567
Deferred income tax (benefit) expense	(49,139)	(43,988)	4,762
Net gains on sales of loans	(3,634)	(6,411)	(8,909)
Net losses (gains) on AFS debt securities	6,862	(1,306)	(1,568)
Net gains on sales of other real estate owned ("OREO") and other foreclosed assets	(3,451)	(3,042)	(1,977)
Impairment on OREO and other foreclosed assets	0	6,861	5,151
Loans held-for-sale:
Originations and purchases	(116)	(447)	(11,155)
Proceeds from sales and paydowns/payoffs of loans originally classified as held-for-sale	0	461	12,552
Proceeds from distributions received from equity method investees	11,282	7,586	13,117
Net change in accrued interest receivable and other assets	(146,270)	187,512	124,496
Net change in accrued expenses and other liabilities	105,304	461,385	(63,360)
Other operating activities, net	3,860	1,673	558
Total adjustments	263,748	937,939	295,441
Net cash provided by operating activities	1,424,909	2,066,022	1,168,422
Net (increase) decrease in:
Investments in qualified affordable housing partnerships, tax credit and other investments	(228,550)	(167,303)	(189,836)
Interest-bearing deposits with banks	128,523	596,994	73,263
Resale agreements:
Proceeds from paydowns and maturities	219,917	1,951,388	982,694
Purchases	(212,725)	(390,077)	(1,876,197)
AFS debt securities:
Proceeds from sales	3,138	129,181	308,812
Proceeds from repayments, maturities and redemptions	1,470,819	896,726	1,766,184
Purchases	(1,549,846)	(1,070,608)	(6,779,655)
HTM debt securities:
Proceeds from repayments, maturities and redemptions	61,744	75,635	0
Purchases	0	(50,000)	0
Loans held-for-investment:
Proceeds from sales of loans originally classified as held-for-investment	711,862	602,725	606,410
Purchases	(600,930)	(657,620)	(1,045,456)
Other changes in loans held-for-investment, net	(4,166,572)	(6,516,182)	(2,877,438)
Proceeds from sales of OREO and other foreclosed assets	3,721	6,482	54,338
Purchase of bank-owned life insurance	0	(734)	(150,000)
Distributions received from equity method investees	23,774	18,221	14,440
Other investing activities, net	(112,036)	(7,720)	(4,763)
Net cash used in investing activities	(4,247,161)	(4,582,892)	(9,117,204)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	144,468	2,709,427	8,464,285
Net increase (decrease) in short-term borrowings	4,500,000	6	(21,143)
FHLB advances:
Proceeds	6,000,000	4,950,200	400
Repayments	(6,000,000)	(5,200,200)	(405,400)
Repurchase agreements:
Repayment	(300,000)	0	0
Extinguishment cost	(3,872)	0	0
Long-term debt and lease liabilities:
Repayments of long-term debt and lease liabilities	(871)	(943)	(1,206)
Common stock:
Proceeds from issuance pursuant to various stock compensation plans and agreements	3,208	3,178	2,573
Stocks tendered for payment of withholding taxes	(23,751)	(19,087)	(15,702)
Repurchase of common stocks pursuant to the Stock Repurchase Program	(82,174)	(99,990)	0
Cash dividends paid	(274,554)	(228,381)	(188,762)
Net cash provided by financing activities	3,962,454	2,114,210	7,835,045
Effect of exchange rate changes on cash and cash equivalents	(7,002)	(28,491)	8,701
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	1,133,200	(431,151)	(105,036)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	3,481,784	3,912,935	4,017,971
CASH AND CASH EQUIVALENTS, END OF YEAR	4,614,984	3,481,784	3,912,935
Cash paid during the year for:
Interest	1,213,319	249,587	87,684
Income taxes, net	291,685	281,269	139,460
Noncash investing and financing activities:
Loans transferred from held-for-investment to held-for-sale	739,379	623,777	599,610
Securities transferred from AFS to HTM debt securities	0	3,010,003	0
Loans transferred to OREO	$ 11,141	$ 270	$ 49,485

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Organization 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 Bank is the Company’s principal asset. As of December 31, 2023, the Company operated i n over 120 locations in the United States (“U.S.”) and Asia. In the U.S., the Bank’s corporate headquarters and main administrative offices a located in California, and its branches and offices are located in California, Texas, New York, Washington, Georgia, Massachusetts, Illinois, and Nevada. In Asia, East West’s presence included full-service branches in Hong Kong, Shanghai, Shantou and Shenzhen, representative offices in Beijing, Chongqing, Guangzhou, Xiamen and Singapore, and administrative support offices in Beijing and Shanghai. The Bank has a banking subsidiary based in China — East West Bank (China) Limited. Significant Accounting Policies Basis of Presentation — The accounting and reporting policies of the Company conform with the U.S. Generally Accepted Accounting Principles (“GAAP”), applicable guidelines prescribed by regulatory authorities and common practices in the banking industry. The preparation of the Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the Consolidated Financial Statements, income and expenses during the reporting period, and the related disclosures. Actual results could differ materially from those estimates. Certain items on the Consolidated Financial Statements and notes for the prior years have been reclassified to conform to the 2023 presentation. Principles of Consolidation — The Consolidated Financial Statements in this Form 10-K include the accounts of East West and its subsidiaries that are majority owned and in which the Company has a controlling financial interest. In accordance with the applicable accounting guidance for consolidation, the Company first determines if it has a variable interest in the entity. A variable interest entity (“VIE”) is an entity that lacks equity investors or whose equity investors do not have a controlling financial interest in the entity through their equity investments. If it is determined that the Company does not have a variable interest in the entity, no further analysis is required and the entity is not consolidated. The Company consolidates a VIE when the Company has a controlling financial interest in the entity and therefore is deemed to be the primary beneficiary. The primary beneficiary of a VIE is determined if the Company has: i) both the power and ability to direct activities of the VIE that most significantly affect the entity’s economic performance; and ii) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE. For an entity that does not meet the definition of a VIE, the entity is determined to be a voting interest entity. The Company consolidates a voting interest entity if it can exert control over the financial and operating policies of an investee, which can occur if the Company has a more than 50% voting interest in the entity. For unconsolidated voting interest entities or VIE, the Company uses the equity, cost or measurement alternative method based on the Company’s voting or economic interest. Intercompany transactions and accounts have been eliminated in consolidation. East West also has six wholly-owned subsidiaries that are statutory business trusts (the “Trusts”). In accordance with Financial Accounting Standards Board Accounting Standards Codification (“ASC”) Topic 810, Consolidation, the Trusts are not included in the Consolidated Financial Statements. Cash and Cash Equivalents — Cash and cash equivalents include cash on hand, cash items in transit, cash due from the Federal Reserve Bank of San Francisco (“FRBSF”) and other financial institutions, and federal funds sold with original maturities up to three months. Interest-Bearing Deposits with Banks — Interest-bearing deposits with banks include cash placed with other banks with original maturities greater than three months and less than one year. Assets Purchased under Resale Agreements and Assets Sold under Repurchase Agreements — Resale agreements are recorded as receivables based on the values at which the securities or loans are acquired. Repurchase agreements are accounted for as collateralized financing transactions and recorded as liabilities based on the values at which the securities are sold. The Company monitors the values of the underlying assets collateralizing the resale and repurchase agreements, including accrued interest, and obtains or posts additional collateral in order to maintain the appropriate collateral requirements for the transactions. For allowance for credit losses on resale agreements, refer to the Allowance for Collateral-Dependent Financial Assets section of this note for details. Securities — The Company’s securities include various debt securities, marketable and non-marketable equity securities. Debt securities are recorded on the Consolidated Balance Sheet as of their trade dates. The Company initially classifies its debt securities as trading securities, AFS or HTM debt securities based on management’s intention on the date of the purchase. Debt securities are purchased for liquidity and investment purposes, as part of asset/liability management and other strategic activities. Debt securities for which the Company has the positive intention and ability to hold until maturity are classified as HTM and are carried at amortized cost, net of allowance for credit losses. Debt securities not classified as trading securities or HTM securities are classified as AFS. AFS debt securities are reported at fair value, net of the allowance for credit losses, with unrealized gains and losses recorded in AOCI, net of applicable income taxes. For details of the allowance for credit losses on debt securities, refer to the Allowance for Credit Losses on Available-for-Sale and Held-to-Maturity Debt Securities sections of this note. Interest income, including any amortization of premium or accretion of discount, is included in net income. The Company recognizes realized gains and losses on the sale of AFS debt securities in earnings, using the specific identification method. Upon transfer of a debt security from the AFS to HTM category, the security’s new amortized cost is reset to fair value, reduced by any previous write-offs but excluding any allowance for credit losses. Unrealized gains or losses at the date of transfer of these securities continue to be reported in AOCI and are amortized into interest income over the remaining life of the securities as effective yield adjustments, in a manner consistent with the amortization or accretion of the original purchase premium or discount on the associated security. For transfers of securities from the AFS to HTM category, any allowance for credit losses that was previously recorded under the AFS model is reversed and an allowance for credit losses is subsequently recorded under the HTM debt security model. The reversal and re-establishment of the allowance for credit losses are recorded in the provision for credit losses. Marketable equity securities with readily determinable fair values are recorded at fair value with unrealized gains and losses due to changes in fair value; and are included in Other investment income on the Consolidated Statement of Income. Marketable equity securities include mutual fund investments, which are included in Investments in qualified affordable housing partnership, tax credit and other investments, net on the Consolidated Balance Sheet. Non-marketable equity securities including tax credit investments, and other equity investments that do not have readily determinable fair values are recorded in Investments in qualified affordable housing partnership, tax credit and other investments, net, and Other assets on the Consolidated Balance Sheet and are accounted for under one of the following accounting methods: • Equity Method — When the Company has the ability to exercise significant influence over the investee. • Cost Method — The cost method is applied to restricted equity securities held for membership and regulatory purposes, such as FRBSF and FHLB stock. These investments are held at their cost minus impairment. If impaired, the carrying value is written down to the fair value of the security. • Measurement Alternative — This method is applied to all remaining non-marketable equity securities. These securities are carried at cost adjusted for impairment, if any, plus or minus observable price changes in orderly transactions of an identical or similar security of the same issuer. The Company’s impairment review for equity method, cost method and measurement alternative securities typically includes an analysis of the facts and circumstances of each security, the intent or requirement to sell the security, the expectations of cash flows, capital needs and the viability of its business model. For equity method and cost method investments, the Company reduces the asset’s carrying value when the Company considers declines in value to be other-than-temporary impairment (“OTTI”). For securities accounted for under the measurement alternative, the Company reduces the asset value when the fair value is less than the carrying value, without the consideration of recovery. Loans Held-for-Sale — Loans are initially classified as loans held-for-sale when they are individually identified as being available for immediate sale and management has committed to a formal plan to sell them. Loans held-for-sale are carried at lower of cost or fair value. Subject to periodic review under the Company’s evaluation process, including asset/liability and credit risk management, the Company may transfer certain loans from held-for-investment to held-for-sale measured at lower of cost or fair value. Any write-downs in the carrying amount of the loan at the date of transfer are recorded as charge-offs to allowance for loan losses. Loan origination fees on loans held-for-sale, net of certain costs in processing and closing the loans, are deferred until the time of sale and are included in the periodic determination of the lower of cost or fair value adjustments and/or the gain or loss recognized at the time of sale. A valuation allowance is established if the fair value of such loans is lower than their cost, with a corresponding charge to noninterest income. If the loan or a portion of the loan cannot be sold, it is subsequently transferred back to the loans held-for-investment portfolio from the loans held-for-sale portfolio at the lower of cost or fair value on the transfer date. Loans Held-for-Investment — At the time of commitment to originate or purchase a loan, the 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. Loans held-for-investment are stated at their outstanding principal, reduced by an allowance for loan losses and net of deferred loan fees or costs, or unearned fees on originated loans, net of unamortized premiums or unaccreted discounts on purchased loans. Nonrefundable fees and direct costs associated with the origination or purchase of loans are deferred and netted against outstanding loan balances. The deferred net loan fees and costs are recognized in interest income as an adjustment to yield over the loan term using the effective interest method. Discounts/premiums on purchased loans are accreted/amortized to interest income using the effective interest method over the remaining contractual maturity. Interest on loans is calculated using the simple-interest method on daily balances of the principal amounts outstanding. Generally, loans are placed on nonaccrual status when they become 90 days past due or more. Loans are considered past due when contractually required principal or interest payments have not been made on the due dates. Loans are also placed on nonaccrual status when management believes, after considering economic and business conditions and collection efforts, that the borrower’s financial condition is such that full collection of principal or interest becomes uncertain, regardless of the length of past due status. Once a loan is placed on nonaccrual status, interest accrual is discontinued and all unpaid accrued interest is reversed against interest income. Interest payments received on nonaccrual loans are reflected as a reduction of principal and not as interest income. A loan is returned to accrual status when the borrower has demonstrated a satisfactory payment trend subject to management’s assessment of the borrower’s ability to repay the loan. Loan Modifications — Certain loans are modified in the normal course of business for competitive reasons or in conjunction with the Company’s loss mitigation activities. Upon the adoption of ASU 2022-02 on January 1, 2023, the Company applies the general loan modification guidance provided in ASC 310-20 to all loan modifications, including modifications made to borrowers experiencing financial difficulty. Under the general loan modification guidance, a modification is treated as a new loan only if the following two conditions are met: (1) the terms of the new loan are at least as favorable to the Company as the terms for comparable loans to other customers with similar collection risks; and (2) modifications to the terms of the original loan are more than minor. If either condition is not met, the modification is accounted for as a continuation of the existing loan with any effect of the modification treated as a prospective adjustment to the loan’s effective interest rate. A modification made to borrowers experiencing financial difficulty may vary by program and by borrower-specific characteristics, and may include rate reductions, principal forgiveness, term extensions, and payment delays, and is intended to minimize the Company’s economic loss and to avoid foreclosure or repossession of collateral. The Company applies the same credit loss methodology it uses for similar loans that were not modified. Troubled Debt Restructurings — Prior to the adoption of ASU 2022-02, a loan was generally classified as a troubled debt restructuring (“TDR”) when the Company, for economic or legal reasons related to the borrower’s financial difficulties, granted a concession to the borrower that the Company would not otherwise consider. The concessions may be granted in various forms, including a below-market change in the stated interest rate, a reduction in the loan balance or accrued interest, a term extension, a payment forbearance and other actions. Loans with contractual terms that were modified as a TDR and were current at the time of restructuring may remain on accrual status if there was demonstrated performance prior to the restructuring and payment in full under the restructured terms was expected. Otherwise, these loans were placed on nonaccrual status and were reported as nonperforming, until the borrower demonstrated a sustained period of performance, generally six months, and the ability to repay the loan according to the contractual terms. If accruing TDRs ceased to perform in accordance with their modified contractual terms, they were placed on nonaccrual status and reported as nonperforming TDRs. TDRs were included in the quarterly allowance for credit losses valuation process. 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; it is increased by the provision for credit losses and decreased by net charge-offs. The allowance for loan losses is evaluated quarterly by management based on regular reviews of the collectability of the Company’s loans, and more often if deemed necessary. The Company develops and documents the allowance for loan losses methodology at the portfolio segment level. The commercial loan portfolio is comprised of commercial and industrial (“C&I”), commercial real estate (“CRE”), multifamily residential, and construction and land loans; and the consumer loan portfolio is comprised of single-family residential, home equity lines of credit (“HELOCs”), and other consumer loans. The allowance for loan losses represents the portion of a loan’s amortized cost basis that the Company does not expect to collect due to anticipated credit losses over the loan’s contractual life, adjusted for prepayments. 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 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 loans do not share similar risk characteristics, the Company evaluates the loan for expected credit losses on an individual basis. Individually assessed loans include nonaccrual loans. The Company evaluates loans for expected credit losses on an individual basis 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. When the loan is deemed uncollectible, it is the Company’s policy to charge off the uncollectible amount against the allowance for loan losses. 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 loan 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 Company considers both the likelihood that funding will occur, and 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 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 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 the 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 — For each reporting period, each AFS debt security that is in an unrealized loss position is 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 of the AFS debt security, excluding accrued interest. 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 AFS 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 security’s ratings and other qualitative factors. For AFS debt securities that are guaranteed or issued by the U.S. government, or government-sponsored enterprises of high credit quality, the Company 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 not to 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 Credit Losses on Held-to-Maturity Debt Securities — For each major HTM debt security type, the allowance for credit losses is estimated collectively for groups of securities with similar risk characteristics. For securities that do not share similar risk characteristics, the losses are estimated individually. The Company applies a zero credit loss assumption to certain HTM debt securities, including debt securities that are either guaranteed or issued by the U.S. government or government-sponsored enterprises, are highly rated by nationally recognized statistical rating organizations (“NRSROs”), and have a long history of no credit losses. Any expected credit loss is recorded through the allowance for credit losses and deducted from the amortized cost basis of the security, reflecting the net amount the Company expects to collect. The amortized cost of the Company’s HTM debt securities excludes accrued interest, which is included in Other assets on the Consolidated Balance Sheet. The Company has made an accounting policy election not to recognize an allowance for credit losses for accrued interest receivables on HTM debt securities, as the Company reverses any accrued interest against interest income if a debt security is placed on nonaccrual status. The criteria used to place HTM debt securities on nonaccrual are largely similar to those described for loans. Any cash collected on nonaccrual HTM debt securities is applied to reduce the security’s amortized cost basis and not as interest income. Generally, the Company returns an HTM security to accrual status when all delinquent interest and principal become current under the contractual terms of the security, and the collectability of remaining principal and interest is no longer doubtful. 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 less the cost to sell, to the amortized cost basis of the related financial asset at the reporting date. Other than 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 — Purchased assets that have experienced a more-than-insignificant deterioration in credit quality since origination are deemed Purchased Credit Deteriorated (“PCD”) assets. For PCD HTM 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. Under this approach, 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 non-credit 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. Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net — The Company records the investments in qualified affordable housing partnerships, net, primarily 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 Company records investments in tax credit and other investments, net, using either the equity method or the measurement alternative method of accounting. The tax credits are recognized on the Consolidated Financial Statements to the extent they are utilized on the Company’s income tax returns in the year the credit arises under the flow-through method of accounting. The investments are evaluated for possible OTTI on an annual basis or on an interim basis, if an event occurs that would trigger potential impairment. OTTI charges and impairment recoveries are recorded within Amortization of tax credit and other investments on the Consolidated Statement of Income. See Note 2 — Fair Value Measurement and Fair Value of Financial Instruments to the Consolidated Financial Statements in this Form 10-K for a discussion on the Company’s impairment evaluation and monitoring process of tax credit investments. Premises and Equipment, Net — The Company’s premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed based on the straight-line method over the estimated useful lives of the various classes of assets. The ranges of estimated useful lives for the principal classes of assets are as follows: Premises and Equipment Useful Lives Buildings 25 years Furniture, fixtures and equipment, and building improvements 3 to 7 years Leasehold improvements Term of lease or useful life, whichever is shorter The Company reviews its long-lived assets for impairment annually, or when events or changes in circumstances indicate that the carrying amounts of these assets may not be recoverable. An asset is considered impaired when the fair value, which is the expected undiscounted cash flows over the remaining useful life, is less than the net book value. The excess of the net book value over its fair value is charged as impairment loss to noninterest expense. Goodwill — Goodwill represents the excess of the purchase price over the fair value of net assets acquired in an acquisition. Goodwill is tested for impairment on an annual basis as of December 31, or more frequently as events occur or circumstances change that indicate a potential impairment at the reporting unit level. The Company assesses goodwill for impairment at each operating segment level. The Company organizes its operations 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 17 — Business Segments to the Consolidated Financial Statements in this Form 10-K. The Company has the option to perform a qualitative assessment of goodwill or elect to bypass the qualitative test and proceed directly to a quantitative test. If the Company performs a qualitative assessment of goodwill to test for impairment and concludes it is more likely than not that a reporting unit’s fair value is greater than its carrying value, quantitative tests are not required. If the qualitative analysis indicates that it is more likely than not that a reporting unit’s fair value is less than its carrying value, the Company is required to perform a quantitative assessment to determine if there is goodwill impairment. Factors considered in the qualitative assessments include but are not limited to macroeconomic conditions, industry and market considerations, financial performance of the respective operating segment and other reporting unit specific considerations. The Company uses a combined income and market approach in its quantitative valuation methodologies. A quantitative valuation involves determining the fair value of each reporting unit and comparing the fair value to its corresponding carrying value. Goodwill impairment loss is recorded as a charge to noninterest expense and an adjustment to the carrying value of goodwill. Subsequent reversals of goodwill impairment are not allowed. Derivatives — As part of its asset/liability management strategy, the Company uses derivative financial instruments to mitigate exposure to interest rate and foreign currency risks, and to assist customers with their risk management objectives. Derivatives utilized by the Company include primarily swaps, forwards and option contracts. Derivative instruments are included in Other assets or Accrued expenses and other liabilities on the Consolidated Balance Sheet at fair value. The related cash flows are recognized on the Cash flows from operating activities section on the Consolidated Statement of Cash Flows. The Company uses its accounting hedges based on the exposure being hedged as either fair value hedges, cash flow hedges or hedges of

Fair Value Measurement and Fair

Fair Value Measurement and Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurement and Fair Value of Financial Instruments	Fair Value Measurement and Fair Value of Financial Instruments Under applicable accounting standards, the Company measures a portion of its assets and liabilities at fair value. These assets and liabilities are predominantly recorded at fair value on a recurring basis. From time to time, certain assets and liabilities are measured at fair value on a nonrecurring basis; that is, they are subject to fair value adjustments only as required through the application of an accounting method such as lower of cost or fair value or write-down of individual assets. The Company categorizes its assets and liabilities into three levels based on the established fair value hierarchy and conducts a review of fair value hierarchy classifications on a quarterly basis. For more information regarding the fair value hierarchy and how the Company measures fair value, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Fair Value to the Consolidated Financial Statements in this Form 10-K. 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 within the fair value hierarchy. Available-for-Sale Debt Securities — The fair value of 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 expectations 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 newly issued 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. The valuations provided by the brokers incorporate information from their trading desks, research and other market data. 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 significant 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 valuation inputs and methodology furnished by third-party pricing service providers for each security category. On an annual basis, the Company assesses the reasonableness of broker pricing by reviewing the related pricing methodologies. This review includes corroborating pricing with market data, performing pricing input reviews under current market-related conditions, and investigating security pricing by instrument as needed. When a quoted price in an active market exists for the identical security, this price is used to determine the fair value and the AFS debt security is classified as Level 1. Level 1 AFS debt securities consist of U.S. Treasury 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. In addition, the Company obtains market quotes from other official published sources. As these valuations are based on observable inputs in the current marketplace, they are classified as Level 2. Equity Securities — Equity securities consisted of mutual funds as of both December 31, 2023 and 2022. The Company invested in these mutual funds for Community Reinvestment Act (“CRA”) purposes. 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 — Interest rate contracts consist of interest rate swaps and options. 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 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. Considering the observable nature of all other significant inputs utilized, the Company classifies these derivative instruments as Level 2. Foreign Exchange Contracts — The fair value of foreign exchange contracts 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 is classified as Level 2. As of both December 31, 2023 and 2022, 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-USD functional currency subsidiary. These foreign currency non-deliverable forward contracts were designated as net investment hedges. The fair value of foreign currency non-deliverable forward 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 the spot 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 — Credit contracts utilized by the Company are comprised of credit risk participation agreements (“RPAs”) entered into by the Company with institutional counterparties. The fair value of the 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. Due to the observable nature of all other significant inputs used in deriving the estimated fair value, credit contracts are classified as Level 2. Equity Contracts — Equity contracts consist of warrants to purchase common or preferred stock of public and private companies, and any liability-classified contingent issuable shares of the Company. The fair value of the warrants is 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 equity 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 equity 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. Since both equity volatility and liquidity discount assumptions are subject to management’s judgment, measurement uncertainty is inherent in the valuation of private company warrants. Due to the unobservable nature of the equity volatility and liquidity discount assumptions used in deriving the estimated fair value, warrants from private companies are classified as Level 3. On a quarterly basis, the changes in the fair value of warrants from private companies are reviewed for reasonableness, and a measurement of uncertainty analysis on the equity volatility and liquidity discount assumptions is performed. In connection with the Company’s acquisition of a 49.99% equity interest in Rayliant during the third quarter of 2023, the Company granted performance-based RSUs as part of its consideration. The vesting of these equity contracts is contingent on Rayliant meeting certain financial performance targets, and they are accounted for as a derivative liability. The fair value of these liability-classified equity contracts varies based on the operating revenue and operating EBITDA of Rayliant to be achieved during the future performance period. Due to the unobservable nature of the input assumptions, these equity contracts are classified as Level 3. For additional information on the equity contracts, refer to Note 5 — Derivatives and Note 7 — 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-K. Commodity Contracts — Commodity contracts consist of swaps and options referencing commodity products. 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 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. 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. 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 December 31, 2023 and 2022: Assets and Liabilities Measured at Fair Value on a Recurring Basis ($ in thousands) Level 1 Level 2 Level 3 Total Fair Value AFS debt securities: U.S. Treasury securities $ 1,060,375 $ — $ — $ 1,060,375 U.S. government agency and U.S. government sponsored enterprise debt securities — 364,446 — 364,446 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities — 468,259 — 468,259 Residential mortgage-backed securities — 1,727,594 — 1,727,594 Municipal securities — 261,016 — 261,016 Non-agency mortgage-backed securities: Commercial mortgage-backed securities — 367,516 — 367,516 Residential mortgage-backed securities — 553,671 — 553,671 Corporate debt securities — 502,425 — 502,425 Foreign government bonds — 227,874 — 227,874 Asset-backed securities — 42,300 — 42,300 Collateralized loan obligations (“CLOs”) — 612,861 — 612,861 Total AFS debt securities $ 1,060,375 $ 5,127,962 $ — $ 6,188,337 Investments in qualified affordable housing partnerships, tax credit and other investments, net: Equity securities $ 20,509 $ 4,150 $ — $ 24,659 Total investments in qualified affordable housing partnerships, tax credit and other investments, net $ 20,509 $ 4,150 $ — $ 24,659 Derivative assets: Interest rate contracts $ — $ 473,907 $ — $ 473,907 Foreign exchange contracts — 57,072 — 57,072 Credit contracts — 1 — 1 Equity contracts — — 336 336 Commodity contracts — 79,604 — 79,604 Gross derivative assets $ — $ 610,584 $ 336 $ 610,920 Netting adjustments (1) $ — $ (312,792) $ — $ (312,792) Net derivative assets $ — $ 297,792 $ 336 $ 298,128 Derivative liabilities: Interest rate contracts $ — $ 433,936 $ — $ 433,936 Foreign exchange contracts — 42,564 — 42,564 Equity contracts (2) — — 15,119 15,119 Credit contracts — 25 — 25 Commodity contracts — 121,670 — 121,670 Gross derivative liabilities $ — $ 598,195 $ 15,119 $ 613,314 Netting adjustments (1) $ — $ (76,170) $ — $ (76,170) Net derivative liabilities $ — $ 522,025 $ 15,119 $ 537,144 Assets and Liabilities Measured at Fair Value on a Recurring Basis ($ in thousands) Level 1 Level 2 Level 3 Total Fair Value AFS debt securities: U.S. Treasury securities $ 606,203 $ — $ — $ 606,203 U.S. government agency and U.S. government sponsored enterprise debt securities — 461,607 — 461,607 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities — 500,269 — 500,269 Residential mortgage-backed securities — 1,762,195 — 1,762,195 Municipal securities — 257,099 — 257,099 Non-agency mortgage-backed securities: Commercial mortgage-backed securities — 398,329 — 398,329 Residential mortgage-backed securities — 649,224 — 649,224 Corporate debt securities — 526,274 — 526,274 Foreign government bonds — 227,053 — 227,053 Asset-backed securities — 49,076 — 49,076 CLOs — 597,664 — 597,664 Total AFS debt securities $ 606,203 $ 5,428,790 $ — $ 6,034,993 Investments in qualified affordable housing partnerships, tax credit and other investments, net: Equity securities $ 19,777 $ 4,177 $ — $ 23,954 Total investments in qualified affordable housing partnerships, tax credit and other investments, net $ 19,777 $ 4,177 $ — $ 23,954 Derivative assets: Interest rate contracts $ — $ 440,283 $ — $ 440,283 Foreign exchange contracts — 53,109 — 53,109 Equity contracts — — 323 323 Commodity contracts — 261,613 — 261,613 Gross derivative assets $ — $ 755,005 $ 323 $ 755,328 Netting adjustments (1) $ — $ (614,783) $ — $ (614,783) Net derivative assets $ — $ 140,222 $ 323 $ 140,545 Derivative liabilities: Interest rate contracts $ — $ 584,516 $ — $ 584,516 Foreign exchange contracts — 44,117 — 44,117 Credit contracts — 23 — 23 Commodity contracts — 258,608 — 258,608 Gross derivative liabilities $ — $ 887,264 $ — $ 887,264 Netting adjustments (1) $ — $ (242,745) $ — $ (242,745) Net derivative liabilities $ — $ 644,519 $ — $ 644,519 (1) Represents balance sheet netting of derivative assets and liabilities and related cash collateral under master netting agreements or similar agreements. See Note 5 — Derivatives to the Consolidated Financial Statements in this Form 10-K for additional information. (2) Equity contracts classified as derivative liabilities consist of performance-based RSUs granted as part of EWBC’s consideration in its investment in Rayliant. For the years ended December 31, 2023, 2022 and 2021, Level 3 fair value measurements that were measured on a recurring basis consisted of warrant equity contracts issued by private companies and liability-classified contingent issuable shares of the Company. The following table provides a reconciliation of the beginning and ending balances of these equity contracts for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Derivative assets: Equity contracts Beginning balance $ 323 $ 215 $ 273 Total (losses) gains included in earnings (1) (79) 17 32 Issuances 92 91 12 Settlements — — (96) Transfers out of Level 3 (2) — — (6) Ending balance $ 336 $ 323 $ 215 Derivative liabilities: Equity contracts (3) Beginning balance $ — $ — $ — Issuances 15,119 — — Ending balance $ 15,119 $ — $ — (1) Includes both realized and unrealized (losses) gains recorded in Lending fees on the Consolidated Statement of Income. The unrealized (losses) gains were $(79) thousand, $17 thousand, and $(44) thousand for the years ended December 31, 2023, 2022 and 2021, respectively. (2) During the year ending December 31, 2021, the Company transferred $6 thousand of equity contracts measured on a recurring basis out of Level 3 to Level 2 after the corresponding issuer of the equity warrant, which was previously a private company, completed its initial public offering and became a public company. (3) Equity contracts classified as derivative liabilities consist of performance-based RSUs granted as part of EWBC’s consideration in its investment in Rayliant. The following table presents quantitative information about the significant unobservable inputs used in the valuation of Level 3 fair value measurements as of December 31, 2023 and 2022. The significant unobservable inputs presented in the table below are those that the Company considers significant to the fair value of the Level 3 assets. The Company considers unobservable inputs to be significant if, by their exclusion, the fair value of the Level 3 assets would be impacted by a predetermined percentage change. ($ in thousands) Fair Value Measurements (Level 3) Valuation Technique Unobservable Inputs Range of Inputs Weighted- Average of Inputs December 31, 2023 Derivative assets: Equity contracts $ 336 Black-Scholes option pricing model Equity volatility 37% — 48% 45% (1) Liquidity discount 47% 47% Derivative liabilities: Equity contracts (2) $ 15,119 Internal model Payout % designated based on operating revenue and operating EBITDA of investee 84% 84% December 31, 2022 Derivative assets: Equity contracts $ 323 Black-Scholes option pricing model Equity volatility 42% — 60% 54% (1) Liquidity discount 47% 47% (1) Weighted-average of inputs is calculated based on the fair value of equity contracts as of December 31, 2023 and 2022. (2) Equity contracts classified as derivative liabilities consist of performance-based RSUs granted as part of EWBC’s consideration in its investment in Rayliant. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Assets measured at fair value on a nonrecurring basis include certain individually evaluated loans held-for-investment, 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 the impairment on certain individually evaluated loans held-for-investment and investments in qualified affordable housing partnerships, tax credit and other investments, from write-downs of OREO and other nonperforming assets, or from the application of lower of cost or fair value on loans held-for-sale. Individually Evaluated Loans Held-for-Investment — Individually evaluated loans held-for-investment are classified as Level 3 assets. The following two methods are used to derive the fair value of individually evaluated loans held-for-investment: • Discounted cash flow valuation techniques that consist of developing an expected stream of cash flows over the life of the loans, and then calculating the present value of the loans by discounting the expected cash flows at a designated discount rate. • When the repayment of an individually evaluated loan is dependent on the sale of the collateral, the fair value of the loan is determined 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, or is unavailable. An internal valuation utilizes one or more valuation techniques such as the income, market and/or cost approaches. Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net — The Company conducts due diligence on its investments in qualified affordable housing partnerships, tax credit and other investments prior to the initial investment date and through the placed-in-service date. After these investments are either acquired or placed into service, the Company continues its periodic monitoring process to ensure book values are realizable and that there is no significant tax credit recapture risk. This monitoring process includes reviewing the investment entity’s quarterly financial statements and annual tax returns, the annual financial statements of the guarantor (if any) and a comparison of the actual performance of the investment against the financial projections prepared at the time 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: • expected future cash flows that are less than the carrying amoun t of the investment; • changes in the economic, market or technological environment that could adversely affect the investee’s operations; • the potential for tax credit recapture; 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 information 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, Investments — Equity Method and Joint Ventures, 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. Loans Held-for-Sale — Loans held-for-investment subsequently transferred to held-for-sale are recorded at the lower of cost or fair value upon transfer. Loans held-for-sale may be measured at fair value on a nonrecurring basis when fair value is less than cost. Fair value is generally determined based on available market data for similar loans and therefore, loans held-for-sale are classified as Level 2. Other Nonperforming Assets — Other nonperforming assets are recorded at fair value upon transfer 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 estimated recovery of the foreclosed asset. The Company records an impairment when the foreclosed asset’s fair value declines below its carrying value. The fair value measurement of other nonperforming assets is classified within one of the three levels in a valuation hierarchy based upon the observability of inputs to the valuation as of the measurement date. The following tables present the carrying amounts of assets that were still held and had fair value adjustments measured on a nonrecurring basis as of December 31, 2023 and 2022: Assets Measured at Fair Value on a Nonrecurring Basis ($ in thousands) Level 1 Level 2 Level 3 Fair Value Measurements Loans held-for-investment: Commercial: C&I $ — $ — $ 22,035 $ 22,035 CRE: CRE — — 22,653 22,653 Total commercial — — 44,688 44,688 Consumer: Residential mortgage: HELOCs — — 1,204 1,204 Total consumer — — 1,204 1,204 Total loans held-for-investment $ — $ — $ 45,892 $ 45,892 Investments in qualified affordable housing partnerships, tax credit and other investments, net $ — $ — $ 868 $ 868 Assets Measured at Fair Value on a Nonrecurring Basis ($ in thousands) Level 1 Level 2 Level 3 Fair Value Measurements Loans held-for-investment: Commercial: C&I $ — $ — $ 40,011 $ 40,011 CRE: CRE — — 31,380 31,380 Total commercial — — 71,391 71,391 Consumer: Residential mortgage: HELOCs — — 1,223 1,223 Total consumer — — 1,223 1,223 Total loans held-for-investment $ — $ — $ 72,614 $ 72,614 The following table presents the increase (decrease) in the fair value of certain assets held at the end of the respective reporting periods, for which a nonrecurring fair value adjustment was recognized for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Loans held-for-investment: Commercial: C&I $ (6,152) $ (25,996) $ (9,580) CRE: CRE (1,183) (7,098) (10,231) Total commercial (7,335) (33,094) (19,811) Consumer: Residential mortgage: HELOCs (40) 166 (4) Total consumer $ (40) $ 166 $ (4) Total loans held-for-investment $ (7,375) $ (32,928) $ (19,815) Investments in qualified affordable housing partnerships, tax credit and other investments, net $ (1,140) $ 469 $ 877 Other nonperforming assets $ — $ (6,861) $ (4,241) 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 December 31, 2023 and 2022: ($ in thousands) Fair Value Measurements (Level 3) Valuation Techniques Unobservable Inputs Range of Inputs Weighted-Average of Inputs December 31, 2023 Loans held-for-investment $ 16,328 Fair value of collateral Discount 15% — 75% 45% (1) $ 3,009 Fair value of collateral Contract value NM NM $ 26,555 Fair value of property Selling cost 8% 8% Investments in qualified affordable housing partnerships, tax credit and other investments, net $ 868 Individual analysis of each investment Expected future tax NM NM December 31, 2022 Loans held-for-investment $ 23,322 Discounted cash flows Discount 4% — 6% 4% (1) $ 17,912 Fair value of collateral Discount 15% — 75% 37% (1) $ 31,380 Fair value of property Selling cost 8% 8% NM - Not meaningful (1) Weighted-average of inputs is based on the relative fair value of the respective assets as of December 31, 2023 and 2022. Disclosures about the Fair Value of Financial Instruments The following tables present the fair value estimates for financial instruments as of December 31, 2023 and 2022, 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, restricted equity securities, at cost, and mortgage servicing rights that are included in Other assets , and accrued interest payable which is included in Accrued expenses and other liabilities . These financial instruments are measured on an amortized cost basis on the Company’s Consolidated Balance Sheet. December 31, 2023 ($ in thousands) Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value Financial assets: Cash and cash equivalents $ 4,614,984 $ 4,614,984 $ — $ — $ 4,614,984 Interest-bearing deposits with banks $ 10,498 $ — $ 10,498 $ — $ 10,498 Resale agreements $ 785,000 $ — $ 699,056 $ — $ 699,056 HTM debt securities $ 2,956,040 $ 488,551 $ 1,965,420 $ — $ 2,453,971 Restricted equity securities, at cost $ 79,811 $ — $ 79,811 $ — $ 79,811 Loans held-for-sale $ 116 $ — $ 116 $ — $ 116 Loans held-for-investment, net $ 51,542,039 $ — $ — $ 50,256,565 $ 50,256,565 Mortgage servicing rights $ 6,602 $ — $ — $ 9,470 $ 9,470 Accrued interest receivable $ 331,490 $ — $ 331,490 $ — $ 331,490 Financial liabilities: Demand, checking, savings and money market deposits $ 38,048,974 $ — $ 38,048,974 $ — $ 38,048,974 Time deposits $ 18,043,464 $ — $ 18,004,951 $ — $ 18,004,951 Short-term borrowings $ 4,500,000 $ — $ 4,500,000 $ — $ 4,500,000 Long-term debt $ 148,249 $ — $ 150,896 $ — $ 150,896 Accrued interest payable $ 205,430 $ — $ 205,430 $ — $ 205,430 December 31, 2022 ($ in thousands) Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value Financial assets: Cash and cash equivalents $ 3,481,784 $ 3,481,784 $ — $ — $ 3,481,784 Interest-bearing deposits with banks $ 139,021 $ — $ 139,021 $ — $ 139,021 Resale agreements $ 792,192 $ — $ 693,656 $ — $ 693,656 HTM debt securities $ 3,001,868 $ 471,469 $ 1,983,702 $ — $ 2,455,171 Restricted equity securities, at cost $ 78,624 $ — $ 78,624 $ — $ 78,624 Loans held-for-sale $ 25,644 $ — $ 25,644 $ — $ 25,644 Loans held-for-investment, net $ 47,606,785 $ — $ — $ 46,670,690 $ 46,670,690 Mortgage servicing rights $ 6,235 $ — $ — $ 10,917 $ 10,917 Accrued interest receivable $ 263,430 $ — $ 263,430 $ — $ 263,430 Financial liabilities: Demand, checking, savings and money market deposits $ 42,637,316 $ — $ 42,637,316 $ — $ 42,637,316 Time deposits $ 13,330,533 $ — $ 13,228,777 $ — $ 13,228,777 Repurchase agreements $ 300,000 $ — $ 304,097 $ — $ 304,097 Long-term debt $ 147,950 $ — $ 143,483 $ — $ 143,483 Accrued interest payable $ 37,198 $ — $ 37,198 $ — $ 37,198

Assets Purchased under Resale A

Assets Purchased under Resale Agreements and Sold under Repurchase Agreements	12 Months Ended
	Dec. 31, 2023
RESALE AND REPURCHASE AGREEMENTS
Assets Purchased under Resale Agreements and Sold under Repurchase Agreements	Assets Purchased under Resale Agreements and Sold under Repurchase Agreements Assets Purchased under Resale Agreements The Company’s resale agreements exposes it to credit risk for both the counterparties and the underlying collateral. The Company manages credit exposure from certain transactions by entering into master netting agreements and collateral arrangements with the counterparties. The relevant agreements allow for an efficient closeout of the transaction, liquidation and set-off of collateral against the net amount owed by the counterparty following a default. It is also the Company’s policy to take possession, where possible, of the assets underlying resale agreements. As a result of the Company’s credit risk mitigation practices with respect to resale agreements as described above, the Company did not hold any reserves for credit impairment with respect to these agreements as of both December 31, 2023 and 2022. Securities Purchased under Resale Agreements — Total securities purchased under resale agreements were $785 million and $760 million as of December 31, 2023 and 2022, respectively. The weighted-average yields were 2.87%, 2.12% and 1.53% for the years ended December 31, 2023, 2022 and 2021, respectively. Loans Purchased under Resale Agreements — Loans purchased under resale agreements were $32 million a s of December 31, 2022. The Company had no loans purchased under resale agreements as of December 31, 2023 due to the maturity of the underlying loans. The weighted-average yields were 2.16% and 1.53% for the years ended December 31, 2022 and 2021, respectively. Assets Sold under Repurchase Agreements — Gross repurchase agreements were $300 million as of December 31, 2022. The Company extinguished $300 million of repurchase agreements during the first quarter of 2023 and recorded $4 million of extinguishment charges during 2023. In comparison, no extinguishment charges were recorded for the years ended December 31, 2022 and 2021. The weighted-average interest rates were 3.07% and 2.61% for the years ended December 31, 2022 and 2021, respectively These weighted-average interest rates also reflect the impact of short-term repurchase agreements entered and repaid during the years presented. Balance Sheet Offsetting The Company’s resale and repurchase agreements are transacted under legally enforceable master netting agreements that, in the event of default by the counterparty, provide the Company the right to liquidate securities held and to offset receivables and payables with the same counterparty. The Company nets resale and repurchase transactions with the same counterparty on the Consolidated Balance Sheet when it has a legally enforceable master netting agreement and the transactions are eligible for netting under ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements . Collateral received includes securities and loans that are not recognized on the Consolidated Balance Sheet. Collateral pledged consists of securities that are not netted on the Consolidated Balance Sheet against the related collateralized liability. Securities received or pledged as collateral in resale and repurchase agreements with other financial institutions may also be sold or re-pledged by the secured party, and are usually delivered to and held by the third-party trustees. The following tables present the resale and repurchase agreements included on the Consolidated Balance Sheet as of December 31, 2023 and 2022: ($ in thousands) December 31, 2023 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 Collateral Received Net Amount Resale agreements $ 785,000 $ — $ 785,000 $ (715,358) (1) $ 69,642 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 Collateral Pledged Net Amount Repurchase agreements $ — $ — $ — $ — $ — ($ in thousands) December 31, 2022 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 Collateral Received Net Amount Resale agreements $ 792,192 $ — $ 792,192 $ (701,790) (1) $ 90,402 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 Collateral Pledged Net Amount Repurchase agreements $ 300,000 $ — $ 300,000 $ (300,000) (2) $ — (1) Represents the fair value of assets 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 assets 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 5 — Derivatives to the Consolidated Financial Statements in this Form 10-K for additional information.

Securities

Securities	12 Months Ended
	Dec. 31, 2023
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 and HTM debt securities as of December 31, 2023 and 2022: December 31, 2023 ($ in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value AFS debt securities: U.S. Treasury securities $ 1,112,587 $ 101 $ (52,313) $ 1,060,375 U.S. government agency and U.S. government-sponsored enterprise debt securities 412,086 — (47,640) 364,446 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 531,377 158 (63,276) 468,259 Residential mortgage-backed securities 1,956,927 380 (229,713) 1,727,594 Municipal securities: 297,283 75 (36,342) 261,016 Non-agency mortgage-backed securities: Commercial mortgage-backed securities 409,578 — (42,062) 367,516 Residential mortgage-backed securities 643,335 — (89,664) 553,671 Corporate debt securities 653,501 — (151,076) 502,425 Foreign government bonds 239,333 69 (11,528) 227,874 Asset-backed securities 43,234 — (934) 42,300 CLOs 617,250 — (4,389) 612,861 Total AFS debt securities 6,916,491 783 (728,937) 6,188,337 HTM debt securities U.S. Treasury securities 529,548 — (40,997) 488,551 U.S. government agency and U.S. government-sponsored enterprise debt securities 1,001,836 — (186,904) 814,932 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 493,348 — (88,968) 404,380 Residential mortgage-backed securities 742,436 — (142,119) 600,317 Municipal securities 188,872 — (43,081) 145,791 Total HTM debt securities 2,956,040 — (502,069) 2,453,971 Total debt securities $ 9,872,531 $ 783 $ (1,231,006) $ 8,642,308 December 31, 2022 ($ in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value AFS debt securities: U.S. Treasury securities $ 676,306 $ — $ (70,103) $ 606,203 U.S. government agency and U.S. government-sponsored enterprise debt securities 517,806 67 (56,266) 461,607 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 577,392 — (77,123) 500,269 Residential mortgage-backed securities 2,011,054 41 (248,900) 1,762,195 Municipal securities 303,884 3 (46,788) 257,099 Non-agency mortgage-backed securities: Commercial mortgage-backed securities 447,512 213 (49,396) 398,329 Residential mortgage-backed securities 762,202 — (112,978) 649,224 Corporate debt securities 673,502 — (147,228) 526,274 Foreign government bonds 241,165 174 (14,286) 227,053 Asset-backed securities 51,152 — (2,076) 49,076 CLOs 617,250 — (19,586) 597,664 Total AFS debt securities 6,879,225 498 (844,730) 6,034,993 HTM debt securities: U.S. Treasury securities 524,081 — (52,612) 471,469 U.S. government agency and U.S. government-sponsored enterprise debt securities 998,972 — (209,560) 789,412 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 506,965 — (98,566) 408,399 Residential mortgage-backed securities 782,141 — (148,230) 633,911 Municipal securities 189,709 — (37,729) 151,980 Total HTM debt securities 3,001,868 — (546,697) 2,455,171 Total debt securities $ 9,881,093 $ 498 $ (1,391,427) $ 8,490,164 As of December 31, 2023 and 2022, the amortized cost of debt securities excluded accrued interest receivables of $44 million and $42 million, respectively, which are included in Other assets on the Consolidated Balance Sheet. For the Company’s accounting policy related to debt securities’ accrued interest receivable, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Allowance for Credit Losses on Available-for-Sale Debt Securities and Allowance for Credit Losses on Held-to-Maturity Debt Securities to the Consolidated Financial Statements in this Form 10-K. Unrealized Losses of Available-for-Sale Debt Securities The following tables present the fair value and the associated gross unrealized losses of the Company’s AFS debt securities, aggregated by investment category and the length of time that the securities have been in a continuous unrealized loss position, as of December 31, 2023 and 2022: December 31, 2023 Less Than 12 Months 12 Months or More Total ($ in thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses AFS debt securities: U.S. Treasury securities $ — $ — $ 623,978 $ (52,313) $ 623,978 $ (52,313) U.S. government agency and U.S. government-sponsored enterprise debt securities — — 364,446 (47,640) 364,446 (47,640) U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities — — 463,572 (63,276) 463,572 (63,276) Residential mortgage-backed securities 9,402 (558) 1,661,112 (229,155) 1,670,514 (229,713) Municipal securities 2,825 (15) 254,773 (36,327) 257,598 (36,342) Non-agency mortgage-backed securities: Commercial mortgage-backed securities 2,742 (4) 364,774 (42,058) 367,516 (42,062) Residential mortgage-backed securities — — 553,671 (89,664) 553,671 (89,664) Corporate debt securities — — 502,425 (151,076) 502,425 (151,076) Foreign government bonds 110,955 (144) 88,616 (11,384) 199,571 (11,528) Asset-backed securities — — 42,300 (934) 42,300 (934) CLOs — — 612,861 (4,389) 612,861 (4,389) Total AFS debt securities $ 125,924 $ (721) $ 5,532,528 $ (728,216) $ 5,658,452 $ (728,937) December 31, 2022 Less Than 12 Months 12 Months or More Total ($ in thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses AFS debt securities: U.S. Treasury securities $ 131,843 $ (8,761) $ 474,360 $ (61,342) $ 606,203 $ (70,103) U.S. government agency and U.S. government-sponsored enterprise debt securities 97,403 (6,902) 214,136 (49,364) 311,539 (56,266) U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 252,144 (30,029) 248,125 (47,094) 500,269 (77,123) Residential mortgage-backed securities 307,536 (20,346) 1,448,658 (228,554) 1,756,194 (248,900) Municipal securities 95,655 (10,194) 159,439 (36,594) 255,094 (46,788) Non-agency mortgage-backed securities: Commercial mortgage-backed securities 106,184 (3,309) 282,301 (46,087) 388,485 (49,396) Residential mortgage-backed securities 22,715 (1,546) 626,509 (111,432) 649,224 (112,978) Corporate debt securities 173,595 (17,907) 352,679 (129,321) 526,274 (147,228) Foreign government bonds 107,576 (429) 36,143 (13,857) 143,719 (14,286) Asset-backed securities 12,450 (524) 36,626 (1,552) 49,076 (2,076) CLOs 144,365 (4,735) 453,299 (14,851) 597,664 (19,586) Total AFS debt securities $ 1,451,466 $ (104,682) $ 4,332,275 $ (740,048) $ 5,783,741 $ (844,730) As of December 31, 2023, the Company had 547 AFS debt securities in a gross unrealized loss position with no credit impairment, primarily consisting of 255 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities, 66 corporate debt securities, and 99 non-agency mortgage-backed securities. In comparison, as of December 31, 2022, the Company had 559 AFS debt securities in a gross unrealized loss position with no credit impairment, primarily consisting of 263 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities, 100 non-agency mortgage-backed securities, and 68 corporate debt securities. Allowance for Credit Losses on Available-for-Sale Debt Securities The Company evaluates each AFS debt security where the fair value declines below amortized cost. For a discussion of the factors and criteria the Company uses in analyzing securities for impairment related to credit losses, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Allowance for Credit Losses on Available-for-Sale Debt Securities to the Consolidated Financial Statements in this Form 10-K. The gross unrealized losses presented in the preceding tables were primarily attributable to interest rate movement and the widening of liquidity and/or credit spreads. U.S. Treasury, U.S. government agency, U.S. government-sponsored agency, and U.S. government-sponsored enterprise debt and mortgage-backed securities are issued, guaranteed, or otherwise supported by the U.S. government and have a zero credit loss assumption. The remaining securities that were in an unrealized loss position as of December 31, 2023 were mainly comprised of the following: • Corporate debt securities — The market value decline as of December 31, 2023 was primarily due to interest rate movement and spread widening. A portion of the corporate debt securities is comprised of subordinated debt securities issued by U.S. banks. Despite the reduction of the market value of these securities after the banking sector disruption in 2023, these securities are nearly all rated investment grade by NRSROs or issued by well-capitalized financial institutions with strong profitability. The contractual payments from these corporate debt securities have been and are expected to be received on time. The Company will continue to monitor the market developments in the banking sector and the credit performance of these securities. • Non-agency mortgage-backed securities — The market value decline as of December 31, 2023, was primarily due to interest rate movement and spread widening. Since these securities are rated investment grade by NRSROs, or have high priority in the cash flow waterfall within the securitization structure, and the contractual payments have historically been on time, the Company believes the risk of credit losses on these securities is low. As of both December 31, 2023 and 2022, the Company intended to hold the AFS debt securities with unrealized losses through the anticipated recovery period and it was more-likely-than-not that the Company would not have to sell these securities before the 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 provided against these securities as of both December 31, 2023 and 2022. In addition, there was no provision for credit losses recognized for the years ended December 31, 2023, 2022, and 2021. Allowance for Credit Losses on Held-to-Maturity Debt Securities The Company separately evaluates its HTM debt securities for any credit losses using an expected loss model, similar to the methodology used for loans. For additional information on the Company’s credit loss methodology, refer to Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Allowance for Credit Losses on Held-to-Maturity Debt Securities to the Consolidated Financial Statements in this Form 10-K. The Company monitors the credit quality of the HTM debt securities using external credit ratings. As of December 31, 2023, all HTM securities were rated investment grade by NRSROs and issued, guaranteed, or supported by U.S. government entities and agencies. Accordingly, the Company applied a zero credit loss assumption and no allowance for credit losses was recorded as of December 31, 2023 and 2022. Overall, the Company believes that the credit support levels of the debt securities are strong and, based on current assessments and macroeconomic forecasts, expects that full contractual cash flows will be received. Realized Gains and Losses The following table presents the gross realized gains from the sales and impairment write-off of AFS debt securities and the related tax (benefit) expense included in earnings for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Gross realized gains from sales (1) $ 3,138 $ 1,306 $ 1,568 Impairment write-off (1) $ (10,000) $ — $ — Related tax (benefit) expense $ (2,029) $ 386 $ 464 (1) During 2023, the Company recognized $7 million in net losses on AFS securities as a component of noninterest income in the Company’s Consolidated Statement of Income, consisting of a $10 million impairment write-off on a subordinated debt security, partially offset by a $3 million gain on the sale of the same security. Interest Income The following table presents the composition of interest income on debt securities for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Taxable interest $ 255,475 $ 179,720 $ 131,985 Nontaxable interest 20,715 19,186 11,998 Total interest income on debt securities $ 276,190 $ 198,906 $ 143,983 Contractual Maturities of Available-for-Sale and Held-to-Maturity Debt Securities The following tables present the contractual maturities, amortized cost, fair value and weighted average yields of AFS and HTM debt securities as of December 31, 2023. 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) Within One Year After One Year through Five Years After Five Years through Ten Years After Ten Years Total AFS debt securities: U.S. Treasury securities Amortized cost $ 436,296 $ 676,291 $ — $ — $ 1,112,587 Fair value 436,397 623,978 — — 1,060,375 Weighted-average yield (1) 5.40 % 1.20 % — % — % 2.85 % U.S. government agency and U.S. government-sponsored enterprise debt securities Amortized cost 50,000 96,470 128,169 137,447 412,086 Fair value 49,882 93,182 109,134 112,248 364,446 Weighted-average yield (1) 5.00 % 3.08 % 1.38 % 2.33 % 2.53 % U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities Amortized cost — 41,533 142,008 2,304,763 2,488,304 Fair value — 39,930 130,528 2,025,395 2,195,853 Weighted-average yield (1) (2) — % 3.13 % 2.70 % 3.68 % 3.62 % Municipal securities Amortized cost 2,240 35,100 9,624 250,319 297,283 Fair value 2,214 32,877 8,752 217,173 261,016 Weighted-average yield (1) (2) 3.39 % 2.24 % 3.22 % 2.23 % 2.27 % Non-agency mortgage-backed securities Amortized cost 96,990 77,046 — 878,877 1,052,913 Fair value 95,856 74,884 — 750,447 921,187 Weighted-average yield (1) 6.74 % 4.44 % — % 2.59 % 3.11 % Corporate debt securities Amortized cost — — 349,501 304,000 653,501 Fair value — — 290,877 211,548 502,425 Weighted average yield (1) — % — % 3.48 % 1.97 % 2.78 % Foreign government bonds Amortized cost 33,262 106,071 50,000 50,000 239,333 Fair value 33,231 106,026 49,593 39,024 227,874 Weighted-average yield (1) 3.02 % 2.28 % 5.73 % 1.50 % 2.94 % Asset-backed securities Amortized cost — — — 43,234 43,234 Fair value — — — 42,300 42,300 Weighted-average yield (1) — % — % — % 6.07 % 6.07 % CLOs Amortized cost — — 319,000 298,250 617,250 Fair value — — 315,410 297,451 612,861 Weighted average yield (1) — % — % 6.80 % 6.82 % 6.81 % Total AFS debt securities Amortized cost $ 618,788 $ 1,032,511 $ 998,302 $ 4,266,890 $ 6,916,491 Fair value $ 617,580 $ 970,877 $ 904,294 $ 3,695,586 $ 6,188,337 Weighted-average yield (1) 5.44 % 1.84 % 4.27 % 3.42 % 3.49 % ($ in thousands) Within One Year After One Year through Five Years After Five Years through Ten Years After Ten Years Total HTM debt securities: U.S. Treasury securities Amortized cost $ — $ 529,548 $ — $ — $ 529,548 Fair value — 488,551 — — 488,551 Weighted-average yield (1) — % 1.05 % — % — % 1.05 % U.S. government agency and U.S. government-sponsored enterprise debt securities Amortized cost — — 343,319 658,517 1,001,836 Fair value — — 296,124 518,808 814,932 Weighted-average yield (1) — % — % 1.90 % 1.89 % 1.90 % U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities Amortized cost — — 99,473 1,136,311 1,235,784 Fair value — — 84,323 920,374 1,004,697 Weighted-average yield (1) (2) — % — % 1.61 % 1.70 % 1.69 % Municipal securities Amortized cost — — — 188,872 188,872 Fair value — — — 145,791 145,791 Weighted-average yield (1) (2) — % — % — % 1.99 % 1.99 % Total HTM debt securities Amortized cost $ — $ 529,548 $ 442,792 $ 1,983,700 $ 2,956,040 Fair value $ — $ 488,551 $ 380,447 $ 1,584,973 $ 2,453,971 Weighted-average yield (1) — % 1.05 % 1.83 % 1.79 % 1.66 % (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. As of December 31, 2023 and 2022, AFS and HTM debt securities with carrying values of $7.0 billion and $794 million, respectively, were pledged to secure borrowings, public deposits, repurchase agreements and for other purposes required or permitted by law. Restricted Equity Securities The following table presents the restricted equity securities included in Other assets on the Consolidated Balance Sheet as of December 31, 2023 and 2022: December 31, ($ in thousands) 2023 2022 FRBSF stock $ 62,561 $ 61,374 FHLB stock 17,250 17,250 Total restricted equity securities $ 79,811 $ 78,624

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives The Company uses derivative instruments to manage exposure to market risk, primarily interest rate and foreign currency risks, as well as to assist customers with their risk management objectives. The Company’s goal is to manage interest rate sensitivity and volatility to mitigate the effect of interest rate changes on 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 serve as 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 in this Form 10-K. The following table presents the notional amounts and fair values of the Company’s derivatives as of December 31, 2023 and 2022. Certain derivative contracts are cleared though central clearing organizations where variation margin is applied daily as settlement to the fair values of the contracts. The fair values are presented on a gross basis prior to the application of bilateral collateral and master netting agreements, but after the application of variation margin payments as settlement to fair values of contracts cleared through central clearing organizations. Applying variation margin payments as settlement to the fair values of derivative contracts cleared through the London Clearing House (“LCH”) and the Chicago Mercantile Exchange (“CME”) resulted in reductions in both the derivative asset and liability fair values of $43 million as of December 31, 2023. In comparison, applying variation margin payments as settlement to LCH- and CME-cleared derivative transactions resulted in reductions in the derivative asset and liability fair values of $167 million and $81 million, respectively, as of December 31, 2022. Total derivative asset and liability fair values are adjusted to reflect the effects of legally enforceable master netting agreements and cash collateral received or paid. The resulting net derivative asset and liability fair values are included in Other assets and Accrued expenses and other liabilities , respectively, on the Consolidated Balance Sheet. December 31, 2023 December 31, 2022 Fair Value Fair Value ($ in thousands) Notional Amount Assets Liabilities Notional Amount Assets Liabilities Derivatives designated as hedging instruments: Cash flow hedges: Interest rate contracts $ 5,250,000 $ 50,421 $ 13,124 $ 3,450,000 $ 13,455 $ 19,687 Net investment hedges: Foreign exchange contracts 81,480 3,394 — 84,832 5,590 — Total derivatives designated as hedging instruments $ 5,331,480 $ 53,815 $ 13,124 $ 3,534,832 $ 19,045 $ 19,687 Derivatives not designated as hedging instruments: Interest rate contracts $ 17,387,909 $ 423,486 $ 420,812 $ 16,932,414 $ 426,828 $ 564,829 Commodity contracts (1) — 79,604 121,670 — 261,613 258,608 Foreign exchange contracts 5,827,149 53,678 42,564 2,982,891 47,519 44,117 Credit contracts (2) 118,391 1 25 140,950 — 23 Equity contracts — 336 (3) 15,119 (4) — 323 (3) — Total derivatives not designated as hedging instruments $ 23,333,449 $ 557,105 $ 600,190 $ 20,056,255 $ 736,283 $ 867,577 Gross derivative assets/liabilities $ 610,920 $ 613,314 $ 755,328 $ 887,264 Less: Master netting agreements (75,534) (75,534) (242,745) (242,745) Less: Cash collateral received/paid (237,258) (636) (372,038) — Net derivative assets/liabilities $ 298,128 $ 537,144 $ 140,545 $ 644,519 (1) The notional amount of the Company’s commodity contracts totaled 18,631 thousand barrels of crude oil and 328,844 thousand units of natural gas, measured in million British thermal units (“MMBTUs”) as of December 31, 2023. In comparison, the notional amount of the Company’s commodity contracts totaled 12,005 thousand barrels of crude oil and 247,704 thousand MMBTUs of natural gas as of December 31, 2022. (2) Notional amount for credit contracts reflects the Company’s pro-rata share of the derivative instruments in RPAs. (3) The Company held equity contracts in 11 private companies and one public company as of December 31, 2023, and 13 private companies and one public company as of December 31, 2022. (4) Equity contracts classified as derivative liabilities consist of 349,138 performance-based RSUs granted as part of EWBC’s consideration in its investment in Rayliant. Derivatives Designated as Hedging Instruments Cash Flow Hedges — The Company uses interest rate swaps to hedge the variability in interest amount received on certain floating-rate commercial loans, or paid on certain floating-rate borrowings due to changes in contractually specified interest rates. As of December 31, 2023, interest rate contracts with total notional amount of $5.3 billion were designated as cash flow hedges to convert certain variable-rate loans from floating-rate payments to fixed-rate payments. Gains and losses on the hedging derivative instruments are recognized in AOCI and reclassified to earnings in the same period the hedged cash flows impact earnings and within the same income statement line item as the hedged cash flows. Considering the interest rates, yield curve and notional amounts as of December 31, 2023, the Company expects to reclassify an estimated $47 million of after-tax net losses on derivative instruments designated as cash flow hedges from AOCI into earnings during the next 12 months. The following table presents the pre-tax changes in AOCI from cash flow hedges for the years ended December 31, 2023, 2022 and 2021. The after-tax impact of cash flow hedges on AOCI is shown in Note 15 — Accumulated Other Comprehensive Income (Loss) to the Consolidated Financial Statements in this Form 10-K. Year Ended December 31, ($ in thousands) 2023 2022 2021 (Losses) gains recognized in AOCI: Interest rate contracts $ (5,767) $ (74,069) $ 1,210 Gains (losses) reclassified from AOCI into earnings: Interest expense (for cash flow hedges on borrowings) $ 696 $ 3,200 $ (868) Interest and dividend income (for cash flow hedges on loans) (82,153) (7,204) — Noninterest income 1,614 (1) — — Total $ (79,843) $ (4,004) $ (868) (1) Represents the amounts in AOCI reclassified into earnings as a result that the forecasted cash flows were no longer probable to occur. Net Investment Hedges — 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 were used to hedge against the risk of adverse changes in the foreign currency exchange rate of the RMB. The following table presents the pre-tax gains (losses) recognized in AOCI on net investment hedges for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Gains (losses) recognized in AOCI $ 2,571 $ 4,509 $ (4,558) Derivatives Not Designated as Hedging Instruments Customer-Related Positions and Economic Hedge Derivatives — The Company enters into interest rate, commodity, and foreign exchange derivatives at the request of its customers and generally enters into offsetting derivative contracts with third-party financial institutions to mitigate the inherent market risk. The Company also utilizes foreign exchange contracts to mitigate the effect of currency fluctuations on certain foreign currency-denominated on-balance sheet assets and liabilities, primarily foreign currency denominated deposits that it offers to its customers. A majority of the foreign exchange contracts had original maturities of one year or less as of both December 31, 2023 and 2022. The following table presents the notional amounts and the gross fair values of the interest rate and foreign exchange derivatives entered into with customers and with third-party financial institutions as economic hedges to customers’ positions as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Fair Value Fair Value ($ in thousands) Notional Amount Assets Liabilities Notional Amount Assets Liabilities Customer-related positions: Interest rate contracts: Swaps $ 6,835,822 $ 25,649 $ 377,388 $ 6,656,491 $ 1,438 $ 521,719 Written options 1,522,531 — 12,756 1,548,158 — 30,904 Collars and corridors 322,732 440 4,481 215,773 — 8,924 Subtotal 8,681,085 26,089 394,625 8,420,422 1,438 561,547 Foreign exchange contracts: Forwards and spot 956,618 9,466 6,756 993,588 17,009 18,090 Swaps 1,588,491 5,801 18,118 623,143 6,629 12,178 Other 136,000 1,839 — 121,631 2,070 245 Subtotal 2,681,109 17,106 24,874 1,738,362 25,708 30,513 Total $ 11,362,194 $ 43,195 $ 419,499 $ 10,158,784 $ 27,146 $ 592,060 Other economic hedges: Interest rate contracts: Swaps $ 6,861,561 $ 380,123 $ 25,731 $ 6,683,828 $ 384,201 $ 2,047 Purchased options 1,522,531 12,783 — 1,580,275 32,233 — Written options — — — 32,117 — 1,235 Collars and corridors 322,732 4,491 456 215,772 8,956 — Subtotal 8,706,824 397,397 26,187 8,511,992 425,390 3,282 Foreign exchange contracts: Forwards and spot 148,003 292 94 77,998 3,050 87 Swaps 2,862,037 36,280 15,757 1,044,900 18,516 11,447 Other 136,000 — 1,839 121,631 245 2,070 Subtotal 3,146,040 36,572 17,690 1,244,529 21,811 13,604 Total $ 11,852,864 $ 433,969 $ 43,877 $ 9,756,521 $ 447,201 $ 16,886 The Company enters into energy commodity contracts with its customers in the oil and gas sector, which allow them to hedge against the risk of fluctuation in energy commodity prices. Offsetting contracts entered with third-party financial institutions are used as economic hedges to manage the Company’s exposure on its customer-related positions. The following table presents the notional amounts in units and the gross fair values of the commodity derivatives issued for customer-related positions and other economic hedges as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Fair Value Fair Value ($ in thousands) Notional Units Assets Liabilities Notional Units Assets Liabilities Customer-related positions: Commodity contracts: Crude oil: Swaps 3,277 Barrels $ 3,735 $ 15,445 2,465 Barrels $ 39,955 $ 6,178 Collars 5,966 Barrels 1,820 5,103 3,011 Barrels 16,038 2,630 Written options — Barrels — — — Barrels 558 — Subtotal 9,243 Barrels 5,555 20,548 5,476 Barrels 56,551 8,808 Natural gas: Swaps 118,325 MMBTUs 438 73,793 92,590 MMBTUs 112,314 73,208 Collars 45,854 MMBTUs 21 20,400 32,072 MMBTUs 2,217 18,317 Written options 1,874 MMBTUs — 233 — MMBTUs — — Subtotal 166,053 MMBTUs 459 94,426 124,662 MMBTUs 114,531 91,525 Total $ 6,014 $ 114,974 $ 171,082 $ 100,333 Other economic hedges: Commodity contracts: Crude oil: Swaps 3,422 Barrels $ 9,166 $ 4,924 2,587 Barrels $ 6,935 $ 36,060 Collars 5,966 Barrels 1,685 1,467 3,942 Barrels 1,378 12,856 Purchased options — Barrels — — — Barrels — 516 Subtotal 9,388 Barrels 10,851 6,391 6,529 Barrels 8,313 49,432 Natural gas: Swaps 116,463 MMBTUs 49,941 305 91,900 MMBTUs 69,767 106,883 Collars 44,454 MMBTUs 12,565 — 31,142 MMBTUs 12,451 1,960 Purchased options 1,874 MMBTUs 233 — — MMBTUs — — Subtotal 162,791 MMBTUs 62,739 305 123,042 MMBTUs 82,218 108,843 Total $ 73,590 $ 6,696 $ 90,531 $ 158,275 Credit Contracts — The Company periodically enters into credit RPAs with institutional counterparties to manage the credit exposure of the interest rate contracts associated with syndication loans. Under the RPAs, a portion of the credit exposure is transferred from one party (the purchaser of credit protection) to another party (the seller of credit protection). The seller of credit protection is required to make payments to the purchaser of credit protection if the underlying borrower defaults on the related interest rate contract. The Company may enter into protection sold or protection purchased RPAs. Credit risk on RPAs is managed by monitoring the credit worthiness of the borrowers and the institutional counterparties, which is a part of the Company’s normal credit review and monitoring process. All reference entities of the protection sold RPAs were investment grade, and the weighted-average remaining maturity was 2.8 years and 2.4 years as of December 31, 2023 and 2022, respectively. Assuming the underlying borrowers referenced in the interest rate contracts defaulted as of December 31, 2023, the maximum exposure of protection sold RPAs would be $177 thousand. In comparison, assuming the underlying borrowers referenced in the interest rate contracts defaulted as of December 31, 2022, the Company would not have any current exposure in the protection sold RPAs. As of December 31, 2023, the Company had one outstanding protection purchased RPA with a notional amount of $25 million and minimal fair value. In comparison, the Company did not have any outstanding protection purchased RPAs as of December 31, 2022. Equity Contracts — As part of the loan origination process, the Company may obtain warrants to purchase the preferred and/or common stock of the borrowers’ companies, which are mainly in the technology and life sciences sectors. Warrants grant the Company the right to buy a certain class of the underlying company’s equity at a certain price before expiration. In connection with the Company’s investment in Rayliant during the third quarter of 2023, the Company granted performance-based RSUs as part of its consideration. The vesting of these equity contracts is contingent on Rayliant meeting certain financial performance targets during the future performance period. For additional information on these equity contracts, refer to Note 2 — Fair Value Measurement and Fair Value of Financial Instruments and Note 7 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities to the Consolidated Financial Statements in this Form 10-K. The following table presents the net gains (losses) recognized on the Company’s Consolidated Statement of Income related to derivatives not designated as hedging instruments for the years ended December 31, 2023, 2022 and 2021: Classification on Consolidated Statement of Income Year Ended December 31, ($ in thousands) 2023 2022 2021 Derivatives not designated as hedging instruments: Interest rate contracts Customer derivative income $ (2,989) $ 13,905 $ 11,493 Foreign exchange contracts Foreign exchange income 52,817 13,799 45,921 Credit contracts Customer derivative income (1) 118 139 Equity contracts - warrants Lending fees 13 151 382 Commodity contracts Customer derivative income (25) 48 (58) Net gains $ 49,815 $ 28,021 $ 57,877 Credit-Risk-Related Contingent Features — Certain of the Company’s over-the-counter derivative contracts contain early termination provisions that require the Company to settle any outstanding balances upon the occurrence of a specified credit-risk-related event. Such an event primarily relates to a downgrade in the credit rating of East West Bank to below investment grade. As of December 31, 2023, the aggregate fair value amounts of all derivative instruments with credit risk-related contingent features that were in a net liability position totaled $9 thousand, for which no collateral was posted to cover these positions. In comparison, as of December 31, 2022, the aggregate fair value amounts of all derivative instruments with credit risk-related contingent features that were in a net liability position totaled $3 million, for which $1 million of collateral was posted to cover these positions. In the event that the credit rating of East West Bank had been downgraded to below investment grade, minimal additional collateral would have been required to be posted as of both December 31, 2023 and 2022. Offsetting of Derivatives The following tables present the gross derivative fair values, the balance sheet netting adjustments, and the resulting net fair values recorded on the Consolidated Balance Sheet, as well as the cash and noncash collateral associated with master netting arrangements. The gross amounts of derivative assets and liabilities are presented after the application of variation margin payments as settlements to the fair values of contracts cleared through central clearing organizations, where applicable. The collateral amounts in the following tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of overcollateralization are not shown: ($ in thousands) As of December 31, 2023 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 $ 610,920 $ (75,534) $ (237,258) $ 298,128 $ (246,259) $ 51,869 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 $ 613,314 $ (75,534) $ (636) $ 537,144 $ — $ 537,144 ($ in thousands) As of December 31, 2022 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 $ 755,328 $ (242,745) $ (372,038) $ 140,545 $ (60,567) $ 79,978 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 $ 887,264 $ (242,745) $ — $ 644,519 $ (38,438) $ 606,081 (1) Includes $3 million and $2 million of gross fair value assets with counterparties that were not subject to enforceable master netting arrangements or similar agreements as of December 31, 2023 and 2022, respectively. (2) Includes $16 million and $1 million of gross fair value liabilities with counterparties that were not subject to enforceable master netting arrangements or similar agreements as of December 31, 2023 and 2022, respectively. (3) Gross cash collateral received under master netting arrangements or similar agreements were $244 million and $385 million as of December 31, 2023 and 2022, respectively. Of the gross cash collateral received, $237 million and $372 million were used to offset against derivative assets as of December 31, 2023 and 2022, respectively. (4) Gross cash collateral pledged under master netting arrangements or similar agreements were $1 million and $490 thousand as of December 31, 2023 and 2022, respectively. Of the gross cash collateral pledged, $1 million was used to offset against derivative liabilities as of December 31, 2023. In comparison, no cash collateral was used to offset against derivative liabilities as of December 31, 2022. (5) Represents the fair value of security collateral received or pledged limited to derivative assets or liabilities that are subject to enforceable master netting arrangements or similar agreements. U.S. 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 has balance sheet netting related to the resale and repurchase agreements. Refer to Note 3 — Assets Purchased under Resale Agreements and Sold under Repurchase Agreements to the Consolidated Financial Statements in this Form 10-K for additional information. Refer to Note 2 — Fair Value Measurement and Fair Value of Financial Instruments to the Consolidated Financial Statements in this Form 10-K for fair value measurement disclosures on derivatives.

Loans Receivable and Allowance

Loans Receivable and Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2023
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 outstanding as of December 31, 2023 and 2022: ($ in thousands) December 31, 2023 December 31, 2022 Commercial: C&I $ 16,581,079 $ 15,711,095 CRE: CRE 14,777,081 13,857,870 Multifamily residential 5,023,163 4,573,068 Construction and land 663,868 638,420 Total CRE 20,464,112 19,069,358 Total commercial 37,045,191 34,780,453 Consumer: Residential mortgage: Single-family residential 13,383,060 11,223,027 HELOCs 1,722,204 2,122,655 Total residential mortgage 15,105,264 13,345,682 Other consumer 60,327 76,295 Total consumer 15,165,591 13,421,977 Total loans held-for-investment (1) $ 52,210,782 $ 48,202,430 Allowance for loan losses (668,743) (595,645) Loans held-for-investment, net (1) $ 51,542,039 $ 47,606,785 (1) Includes $71 million and $70 million of net deferred loan fees and net unamortized premiums as of December 31, 2023 and 2022, respectively. Accrued interest receivable on loans held-for-investment was $267 million and $208 million as of December 31, 2023 and 2022, respectively, and was included in Other assets on the Consolidated Balance Sheet. The interest income reversed was insignificant for the years ended December 31, 2023, 2022 and 2021. For the Company’s accounting policy on accrued interest receivable related to loans held-for-investment, see Note 1 — Summary of Significant Accounting Policies — Loans Held-for-Investment to the Consolidated Financial Statements in this Form 10-K. The Company also has loans held-for-sale. For the Company’s accounting policy on loans held-for-sale, refer to Note 1 — Summary of Significant Accounting Policies — Loans Held-for-Sale to the Consolidated Financial Statements in this Form 10-K. The Company’s FRBSF and FHLB borrowings are primarily secured by loans held-for-investment. Loans held-for-investment totaling $37.2 billion and $28.3 billion, respectively, were pledged to secure borrowings and provide additional borrowing capacity as of December 31, 2023 and 2022. Credit Quality Indicators All loans are subject to the Company’s credit review and monitoring process. For the commercial loan 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 consumer loan portfolio, payment performance or delinquency is typically the driving indicator for risk ratings. The Company utilizes internal credit risk ratings to assign each individual loan a risk rating of 1 through 10: • Pass — loans risk rated 1 through 5 are assigned an internal risk rating category of “Pass.” Loans risk rated 1 are typically loans fully secured by cash. Pass loans have sufficient sources of repayment to repay the loan in full, in accordance with all terms and conditions. • Special mention — loans assigned a risk rating of 6 have potential weaknesses that warrant closer attention by management; these are assigned an internal risk rating category of “Special Mention.” • Substandard — 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 category of “Substandard.” • Doubtful — 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 category of “Doubtful.” • Loss — loans assigned a risk rating of 10 are uncollectible and of such little value that they are no longer considered bankable assets; these are assigned an internal risk rating category of “Loss.” Loan exposures categorized as criticized consist of special mention, substandard, doubtful and loss categories. The Company reviews the internal risk ratings of its loan portfolio on a regular basis, and adjusts the ratings based on changes in the borrowers’ financial status and the collectability of the loans. The following tables summarize the Company’s loans held-for-investment and current year-to-date gross write-offs by loan portfolio segments, internal risk ratings and vintage year as of December 31, 2023 and 2022. The vintage year is the year of loan origination, renewal or major modification. Revolving loans that are converted to term loans presented in the tables below are excluded from term loans by vintage year columns. December 31, 2023 Term Loans by Origination Year ($ in thousands) 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans (1) Total Commercial: C&I: Pass $ 2,314,463 $ 1,628,560 $ 1,296,936 $ 331,982 $ 245,173 $ 164,159 $ 10,053,757 $ 20,143 $ 16,055,173 Criticized (accrual) 105,119 67,899 120,574 15,064 40,920 22,098 117,196 — 488,870 Criticized (nonaccrual) 2,104 7,916 131 4,819 2,979 18,137 950 — 37,036 Total C&I 2,421,686 1,704,375 1,417,641 351,865 289,072 204,394 10,171,903 20,143 16,581,079 YTD gross write-offs (2) 350 10,454 424 3,758 9,748 2,648 1,593 — 28,975 CRE: Pass 2,492,915 4,086,385 2,216,257 1,428,724 1,600,844 2,494,382 92,851 62,771 14,475,129 Criticized (accrual) 36,855 34,485 30,336 48,250 24,437 104,340 — — 278,703 Criticized (nonaccrual) — — — — 444 22,805 — — 23,249 Subtotal CRE 2,529,770 4,120,870 2,246,593 1,476,974 1,625,725 2,621,527 92,851 62,771 14,777,081 YTD gross write-offs (2) — — — — — 1,329 — — 1,329 Multifamily residential: Pass 665,780 1,481,161 808,333 612,408 498,491 857,713 8,690 1,281 4,933,857 Criticized (accrual) — 3,356 54,614 — 693 25,974 — — 84,637 Criticized (nonaccrual) — — — — — 4,669 — — 4,669 Subtotal multifamily residential 665,780 1,484,517 862,947 612,408 499,184 888,356 8,690 1,281 5,023,163 YTD gross write-offs — — — — — 3 — — 3 Construction and land: Pass 209,775 280,151 120,724 39,928 808 5,501 6,981 $ — 663,868 Criticized (accrual) — — — — — — — — — Criticized (nonaccrual) — — — — — — — — — Subtotal construction and land 209,775 280,151 120,724 39,928 808 5,501 6,981 — 663,868 YTD gross write-offs (2) — — — — — — — — — Total CRE 3,405,325 5,885,538 3,230,264 2,129,310 2,125,717 3,515,384 108,522 64,052 20,464,112 YTD gross write-offs (2) — — — — — 1,332 — — 1,332 Total commercial $ 5,827,011 $ 7,589,913 $ 4,647,905 $ 2,481,175 $ 2,414,789 $ 3,719,778 $ 10,280,425 $ 84,195 $ 37,045,191 YTD total commercial gross write-offs (2) $ 350 $ 10,454 $ 424 $ 3,758 $ 9,748 $ 3,980 $ 1,593 $ — $ 30,307 December 31, 2023 Term Loans by Origination Year ($ in thousands) 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans (1) Total Consumer: Residential mortgage: Single-family residential: Pass (3) $ 3,188,830 $ 3,340,789 $ 2,279,802 $ 1,594,525 $ 980,686 $ 1,959,974 $ — $ — $ 13,344,606 Criticized (accrual) 2,680 4,471 566 1,440 1,503 4,167 — — 14,827 Criticized (nonaccrual) (3) 4,466 837 3,902 2,081 3,626 8,715 — — 23,627 Subtotal single-family residential mortgage 3,195,976 3,346,097 2,284,270 1,598,046 985,815 1,972,856 — — 13,383,060 YTD gross write-offs — — — — — — — — — HELOCs: Pass 3,641 3,882 1,734 3,153 729 9,251 1,551,074 126,280 1,699,744 Criticized (accrual) 565 1,219 1,872 101 185 1,470 2,548 1,089 9,049 Criticized (nonaccrual) 815 856 413 72 584 6,863 279 3,529 13,411 Subtotal HELOCs 5,021 5,957 4,019 3,326 1,498 17,584 1,553,901 130,898 1,722,204 YTD gross write-offs (2) — — — — — 41 — 6 47 Total residential mortgage 3,200,997 3,352,054 2,288,289 1,601,372 987,313 1,990,440 1,553,901 130,898 15,105,264 YTD gross write-offs (2) — — — — — 41 — 6 47 Other consumer: Pass 2,286 18,098 135 — — 13,244 26,432 $ — 60,195 Criticized (accrual) — — — — — — — — — Criticized (nonaccrual) — — — — — — 132 — 132 Total other consumer 2,286 18,098 135 — — 13,244 26,564 — 60,327 YTD gross write-offs (2) — — — — — — — — — Total consumer $ 3,203,283 $ 3,370,152 $ 2,288,424 $ 1,601,372 $ 987,313 $ 2,003,684 $ 1,580,465 $ 130,898 $ 15,165,591 YTD total consumer gross write-offs (2) $ — $ — $ — $ — $ — $ 41 $ — $ 6 $ 47 Total loans held-for-investment: Pass $ 8,877,690 $ 10,839,026 $ 6,723,921 $ 4,010,720 $ 3,326,731 $ 5,504,224 $ 11,739,785 $ 210,475 $ 51,232,572 Criticized (accrual) 145,219 111,430 207,962 64,855 67,738 158,049 119,744 1,089 876,086 Criticized (nonaccrual) 7,385 9,609 4,446 6,972 7,633 61,189 1,361 3,529 102,124 Total $ 9,030,294 $ 10,960,065 $ 6,936,329 $ 4,082,547 $ 3,402,102 $ 5,723,462 $ 11,860,890 $ 215,093 $ 52,210,782 YTD total loans held-for-investment gross write-offs (2) $ 350 $ 10,454 $ 424 $ 3,758 $ 9,748 $ 4,021 $ 1,593 $ 6 $ 30,354 December 31, 2022 Term Loans by Origination Year ($ in thousands) 2022 2021 2020 2019 2018 Prior Revolving Loans Revolving Loans Converted to Term Loans (1) Total Commercial: C&I: Pass $ 2,831,834 $ 2,053,215 $ 623,026 $ 392,013 $ 143,970 $ 97,605 $ 9,177,401 $ 20,548 $ 15,339,612 Criticized (accrual) 72,210 34,296 48,761 34,221 20,646 12,933 97,988 — 321,055 Criticized (nonaccrual) 18,722 4,797 10,733 243 5,618 10,315 — — 50,428 Total C&I 2,922,766 2,092,308 682,520 426,477 170,234 120,853 9,275,389 20,548 15,711,095 CRE: Pass 4,178,780 2,404,634 1,505,150 1,771,679 1,471,710 1,909,925 165,653 22,009 13,429,540 Criticized (accrual) 3,518 60,573 159,424 40,095 91,132 32,173 1,455 16,716 405,086 Criticized (nonaccrual) — 19,044 — — — 4,200 — — 23,244 Subtotal CRE 4,182,298 2,484,251 1,664,574 1,811,774 1,562,842 1,946,298 167,108 38,725 13,857,870 Multifamily residential: Pass 1,500,289 892,598 641,677 519,614 350,044 625,293 11,325 — 4,540,840 Criticized (accrual) — — — 707 4,276 27,076 — — 32,059 Criticized (nonaccrual) — — — — — 169 — — 169 Subtotal multifamily residential 1,500,289 892,598 641,677 520,321 354,320 652,538 11,325 — 4,573,068 Construction and land: Pass 288,394 276,839 31,804 3,104 2,805 231 9,073 — 612,250 Criticized (accrual) 4,504 — — — 21,666 — — — 26,170 Criticized (nonaccrual) — — — — — — — — — Subtotal construction and land 292,898 276,839 31,804 3,104 24,471 231 9,073 — 638,420 Total CRE 5,975,485 3,653,688 2,338,055 2,335,199 1,941,633 2,599,067 187,506 38,725 19,069,358 Total commercial $ 8,898,251 $ 5,745,996 $ 3,020,575 $ 2,761,676 $ 2,111,867 $ 2,719,920 $ 9,462,895 $ 59,273 $ 34,780,453 Consumer: Single-family residential: Pass (3) $ 3,548,894 $ 2,453,717 $ 1,775,696 $ 1,101,965 $ 817,164 $ 1,500,359 $ — $ — $ 11,197,795 Criticized (accrual) — 1,275 785 1,463 4,352 3,935 — — 11,810 Criticized (nonaccrual) (3) 141 — 204 3,202 1,721 8,154 — — 13,422 Subtotal single-family residential mortgage 3,549,035 2,454,992 1,776,685 1,106,630 823,237 1,512,448 — — 11,223,027 HELOCs: Pass 520 3,583 7,336 3,203 525 8,960 1,958,692 127,401 2,110,220 Criticized (accrual) — 6 — — — — 4 1,079 1,089 Criticized (nonaccrual) — — 483 231 1,017 4,844 1,001 3,770 11,346 Subtotal HELOCs 520 3,589 7,819 3,434 1,542 13,804 1,959,697 132,250 2,122,655 Total residential mortgage 3,549,555 2,458,581 1,784,504 1,110,064 824,779 1,526,252 1,959,697 132,250 13,345,682 Other consumer: Pass 17,088 137 5,356 — — 15,808 37,804 — 76,193 Criticized (accrual) 3 — — — — — — — 3 Criticized (nonaccrual) — — — — — — 99 — 99 Total other consumer 17,091 137 5,356 — — 15,808 37,903 — 76,295 Total consumer $ 3,566,646 $ 2,458,718 $ 1,789,860 $ 1,110,064 $ 824,779 $ 1,542,060 $ 1,997,600 $ 132,250 $ 13,421,977 Total by risk rating: Pass $ 12,365,799 $ 8,084,723 $ 4,590,045 $ 3,791,578 $ 2,786,218 $ 4,158,181 $ 11,359,948 $ 169,958 $ 47,306,450 Criticized (accrual) 80,235 96,150 208,970 76,486 142,072 76,117 99,447 17,795 797,272 Criticized (nonaccrual) 18,863 23,841 11,420 3,676 8,356 27,682 1,100 3,770 98,708 Total $ 12,464,897 $ 8,204,714 $ 4,810,435 $ 3,871,740 $ 2,936,646 $ 4,261,980 $ 11,460,495 $ 191,523 $ 48,202,430 (1) $29 million, $26 million and $6 million of total commercial loans, primarily comprised of CRE revolving loans, converted to term loans during the years ended December 31, 2023, 2022 and 2021, respectively. During the years ended December 31, 2023 and 2021, respectively, $44 million and $54 million of total consumer loans, comprised of HELOCs, converted to term loans. For the year ended December 31, 2022, no consumer loans converted to term loans. (2) Excludes gross write-offs associated with loans the Company sold or settled. (3) As of each of December 31, 2023 and 2022, $1 million of nonaccrual loans whose payments were guaranteed by the Federal Housing Administration were classified with a “Pass” rating. Nonaccrual and Past Due Loans Loans that are 90 or more days past due are generally placed on nonaccrual status, unless the loan is well-collateralized and in the process of collection. Loans that are less than 90 days past due but have identified deficiencies, such as when the full collection of principal or interest becomes uncertain, are also placed on nonaccrual status. The following tables present the aging analysis of loans held-for-investment as of December 31, 2023 and 2022: December 31, 2023 ($ in thousands) Current Accruing Loans Accruing Loans 30-59 Days Past Due Accruing Loans 60-89 Days Past Due Total Accruing Past Due Loans Total Nonaccrual Loans Total Loans Commercial: C&I $ 16,508,394 $ 28,550 $ 7,099 $ 35,649 $ 37,036 $ 16,581,079 CRE: CRE 14,750,315 1,719 1,798 3,517 23,249 14,777,081 Multifamily residential 5,017,897 597 — 597 4,669 5,023,163 Construction and land 650,617 13,251 — 13,251 — 663,868 Total CRE 20,418,829 15,567 1,798 17,365 27,918 20,464,112 Total commercial 36,927,223 44,117 8,897 53,014 64,954 37,045,191 Consumer: Residential mortgage: Single-family residential 13,313,455 29,285 15,943 45,228 24,377 13,383,060 HELOCs 1,687,301 12,266 9,226 21,492 13,411 1,722,204 Total residential mortgage 15,000,756 41,551 25,169 66,720 37,788 15,105,264 Other consumer 56,930 3,123 142 3,265 132 60,327 Total consumer 15,057,686 44,674 25,311 69,985 37,920 15,165,591 Total $ 51,984,909 $ 88,791 $ 34,208 $ 122,999 $ 102,874 $ 52,210,782 December 31, 2022 ($ in thousands) Current Accruing Loans Accruing Loans 30-59 Days Past Due Accruing Loans 60-89 Days Past Due Total Accruing Past Due Loans Total Nonaccrual Loans Total Loans Commercial: C&I $ 15,651,312 $ 6,482 $ 2,873 $ 9,355 $ 50,428 $ 15,711,095 CRE: CRE 13,820,441 14,185 — 14,185 23,244 13,857,870 Multifamily residential 4,571,899 678 322 1,000 169 4,573,068 Construction and land 638,420 — — — — 638,420 Total CRE 19,030,760 14,863 322 15,185 23,413 19,069,358 Total commercial 34,682,072 21,345 3,195 24,540 73,841 34,780,453 Consumer: Residential mortgage: Single-family residential 11,183,134 13,523 12,130 25,653 14,240 11,223,027 HELOCs 2,102,523 7,700 1,086 8,786 11,346 2,122,655 Total residential mortgage 13,285,657 21,223 13,216 34,439 25,586 13,345,682 Other consumer 73,004 109 3,083 3,192 99 76,295 Total consumer 13,358,661 21,332 16,299 37,631 25,685 13,421,977 Total $ 48,040,733 $ 42,677 $ 19,494 $ 62,171 $ 99,526 $ 48,202,430 The following table presents the amortized cost of loans on nonaccrual status for which there was no related allowance for loan losses as of both December 31, 2023 and 2022. Nonaccrual loans may not have an allowance for credit losses if the loan balances are well secured by collateral values and there is no loss expectation. ($ in thousands) December 31, 2023 December 31, 2022 Commercial: C&I $ 33,089 $ 11,398 CRE 22,653 22,944 Multifamily residential 4,235 — Total commercial 59,977 34,342 Consumer: Single-family residential 4,852 2,998 HELOCs 7,256 7,245 Total consumer 12,108 10,243 Total nonaccrual loans with no related allowance for loan losses $ 72,085 $ 44,585 Foreclosed Assets The Company acquires assets from borrowers through loan restructurings, workouts, or foreclosures. Assets acquired may include real properties (e.g., real estate, land, and buildings) and commercial and personal properties. The Company recognizes foreclosed assets upon receiving assets in satisfaction of a loan (e.g., taking legal title or physical possession). Foreclosed assets, consisting of OREO and other nonperforming assets, are included in Other assets on the Consolidated Balance Sheet. The Company had $11 million in foreclosed assets as of December 31, 2023, compared with $270 thousand as of December 31, 2022. The Company commences the foreclosure process on consumer mortgage loans after a borrower becomes more than 120 days delinquent in accordance with the Consumer Financial Protection Bureau guidelines. The carrying value of the consumer real estate loans that were in an active or suspended foreclosure process was $8 million and $7 million as of December 31, 2023 and 2022, respectively. Loan Modifications to Borrowers Experiencing Financial Difficulty Effective January 1, 2023, the Company adopted ASU 2022-02, which in part eliminated the accounting for TDR and enhanced disclosure requirements for loan modifications to borrowers experiencing financial difficulty. See Note 1 — Summary of Significant Accounting Policies — Loan Modifications to the Consolidated Financial Statements in this Form 10-K for additional information. As part of the Company’s loss mitigation efforts, the Company may agree to modify the contractual terms of a loan to assist borrowers experiencing financial difficulty. The Company negotiates loan modifications on a case-by-case basis to achieve mutually agreeable terms that maximize loan collectability and meet the borrower’s financial needs. The Company considers various factors to identify borrowers experiencing financial difficulty. The primary factor for consumer borrowers is delinquency status. For commercial loan borrowers, these factors include credit risk ratings, the probability of loan risk rating downgrades, and overall risk profile changes. The modification may include, but is not limited to, payment delays, interest rate reductions, term extensions, principal forgiveness, or a combination of such modifications. Commercial loan borrowers that require immaterial modifications such as insignificant interest rate changes, short-term extensions (90 days or less) from the original maturity date, or temporary waivers or extensions of financial covenants which would not constitute material credit actions, are generally not considered to be experiencing financial difficulty and are not included in the disclosure. Insignificant payment deferrals (three months or less in the last 12 months) are also not included in the disclosure. The following table presents the amortized cost of loans that were modified during the year ended December 31, 2023 by loan class and modification type: Year Ended December 31, 2023 Modification Type ($ in thousands) Term Extension Payment Delay Combination: Term Extension/ Payment Delay Combination: Rate Reduction/ Term Extension Combination: Rate Reduction/ Payment Delay Total Modification as a % of Loan Class Commercial: C&I $ 62,704 $ 6,842 $ — $ — $ — $ 69,546 0.42 % CRE: CRE 13,939 — — 32,470 — 46,409 0.23 % Total CRE 13,939 — — 32,470 — 46,409 Total commercial 76,643 6,842 — 32,470 — 115,955 Consumer: Residential mortgage: Single-family residential: — 10,202 3,967 — — 14,169 0.11 % HELOCs — 3,148 1,170 — 815 5,133 0.30 % Total residential mortgage — 13,350 5,137 — 815 19,302 Total consumer — 13,350 5,137 — 815 19,302 Total $ 76,643 $ 20,192 $ 5,137 $ 32,470 $ 815 $ 135,257 The following table presents the financial effects of the loan modifications for the year ended December 31, 2023 by loan class and modification type: Financial Effects of Loan Modifications Year Ended December 31, 2023 ($ in thousands) Principal Forgiveness Weighted-Average Interest Rate Reduction Weighted-Average Term Extension Weighted-Average Payment Delay Commercial: C&I $ 371 (1) — % (1) 1.3 years 0.9 years CRE — 3.00 % 2.1 years — Consumer: Single-family residential — — % 9.3 years 1.8 years HELOCs — 0.11 % 14.2 years 4.6 years Total $ 371 (1) Comprised of C&I loans modified during the year ended December 31, 2023 where the interest rate is waived in addition to principal forgiveness. No recorded investment was outstanding as of December 31, 2023. A modified loan may become delinquent and may result in a payment default (generally 90 days past due) subsequent to modification. During the year ended December 31, 2023 , two residential mortgage loans that were modified as payment delay totaling $1 million subsequently defaulted. The Company closely monitors the performance of modified loans to borrowers experiencing financial difficulty to understand the effectiveness of its modification efforts. The following table presents the performance of loans that were modified as of December 31, 2023 since the adoption of ASU 2022-02 on January 1, 2023: Payment Performance as of December 31, 2023 ($ in thousands) Current 30-89 Days Past Due 90+ Days Past Due Total Commercial: C&I $ 52,087 $ 8,153 $ 9,306 $ 69,546 CRE: CRE 46,409 — — 46,409 Total CRE 46,409 — — 46,409 Total commercial 98,496 8,153 9,306 115,955 Consumer: Residential mortgage: Single-family residential 11,197 2,425 547 14,169 HELOCs 4,207 177 749 5,133 Total residential mortgage 15,404 2,602 1,296 19,302 Total consumer 15,404 2,602 1,296 19,302 Total $ 113,900 $ 10,755 $ 10,602 $ 135,257 As of December 31, 2023, commitments to lend additional funds to borrowers whose loans were modified were $4 million. Troubled Debt Restructurings Prior to the Adoption of ASU 2022-02 Prior to the adoption of ASU 2022-02, the Company accounted for a modification to the contractual terms of a loan that resulted in granting a concession to a borrower experiencing financial difficulties as a TDR. ASU 2022-02 eliminated TDR accounting prospectively for all restructurings occurring on or after January 1, 2023. The following table presents the additions to TDRs for the years ended December 31, 2022, and 2021: Loans Modified as TDRs During the Year Ended December 31, 2022 December 31, 2021 ($ in thousands) 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 7 $ 69,050 $ 38,415 $ 12,638 5 $ 24,155 $ 20,263 $ 1,108 CRE: Multifamily residential — — — — 1 1,101 1,066 — Total CRE — — — — 1 1,101 1,066 — Total commercial 7 69,050 38,415 12,638 6 25,256 21,329 1,108 Consumer: Residential mortgage: HELOCs 2 662 697 2 — — — — Total residential mortgage 2 662 697 2 — — — — Total consumer 2 662 697 2 — — — — Total 9 $ 69,712 $ 39,112 $ 12,640 6 $ 25,256 $ 21,329 $ 1,108 (1) Includes subsequent payments after modification and reflects the balance as of December 31, 2022 and 2021. (2) Includes charge-offs and specific reserves recorded since the modification date. Loans modified more than once are reported in the period they were first modified. The following table presents the TDR post-modification outstanding balances by the primary modification type for the years ended December 31, 2022 and 2021: Modification Type During the Year Ended December 31, 2022 December 31, 2021 ($ in thousands) Principal (1) Interest Rate Reduction Other (2) Total Principal (1) Interest Rate Reduction Other Total Commercial: C&I $ 24,238 $ — $ 14,177 $ 38,415 $ 4,679 $ 15,584 $ — $ 20,263 CRE: Multifamily residential — — — — 1,066 — — 1,066 Total CRE — — — — 1,066 — — 1,066 Total commercial 24,238 — 14,177 38,415 5,745 15,584 — 21,329 Consumer: Residential mortgage: HELOCs 697 — — 697 — — — — Total residential mortgage 697 — — 697 — — — — Total consumer 697 — — 697 — — — — Total $ 24,935 $ — $ 14,177 $ 39,112 $ 5,745 $ 15,584 $ — $ 21,329 (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 primarily funding to secure additional collateral and provide liquidity to collateral-dependent and term extension to C&I loans. After a loan is modified as a TDR, the Company continues to monitor its performance under its most recent restructured terms. A TDR may become delinquent and result in payment default (generally 90 days past due) subsequent to restructuring. The following table presents information on loans that entered into default during the years ended December 31, 2022 and 2021 that were modified as TDRs during the 12 months preceding payment default: Loans Modified as TDRs that Subsequently Defaulted 2022 2021 ($ in thousands) Number of Loans Recorded Investment Number of Loans Recorded Investment Commercial: C&I 2 $ 10,296 1 $ 11,431 Total commercial 2 10,296 1 11,431 Total 2 $ 10,296 1 $ 11,431 As of December 31, 2022, the remaining commitments to lend to borrowers whose terms of their outstanding owed balances were modified as TDRs was $16 million. Allowance for Credit Losses The Company has a current expected credit losses (“CECL”) framework for all financial assets measured at amortized cost and certain off-balance sheet credit exposures. The Company’s allowance for credit losses, which includes both the allowance for loan losses and the allowance for unfunded credit commitments, is calculated with the objective of maintaining a reserve sufficient to absorb losses inherent in our credit portfolios. The measurement of the allowance for credit losses is based on management’s best estimate of lifetime expected credit losses, periodic evaluation of the loan portfolio, lending-related commitments and other relevant factors. The allowance for credit losses is deducted from the amortized cost basis of a financial asset or a group of financial assets so that the balance sheet reflects the net amount the Company expects to collect. Amortized cost is the principal balance outstanding, net of purchase premiums and discounts, deferred fees and costs, and escrow advances. Subsequent changes in expected credit losses are recognized in net income as a provision for, or a reversal of, credit loss expense. The allowance for credit losses estimation involves procedures to consider the unique risk characteristics of the portfolio segments. The majority of the Company’s credit exposures that share risk characteristics with other similar exposures are collectively evaluated. The collectively evaluated loans include performing loans and unfunded credit commitments. If an exposure does not share risk characteristics with other exposures, the Company generally estimates expected credit losses on an individual basis. Allowance for Collectively Evaluated Loans The allowance for collectively evaluated loans consists of a quantitative component that assesses the different risk factors considered in our models and a qualitative component that considers risk factors external to the models. Each of these components are described below. Quantitative Component — The Company applies quantitative methods to estimate loan losses by considering a variety of factors such as historical loss experience, the current credit quality of the portfolio, and an economic outlook over the life of the loan. The Company incorporates forward-looking information using macroeconomic scenarios which 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 downside or upside scenarios reflecting possible worsening or improving economic conditions. The quantitative models incorporate a probability-weighted calculation of these macroeconomic scenarios over a reasonable and supportable forecast period. If the life of the loans extends beyond the reasonable and supportable forecast period, the Company will consider historical experience or long-run macroeconomic trends over the remaining life of the loans to estimate the allowance for loan losses. There were no changes to the reasonable and supportable forecast period, except to the C&I segment, and no changes to the reversion to the historical loss experience method in 2023 and 2022. The reasonable and supportable forecast period for the C&I segment changed from 11 quarters to eight quarters due to model redevelopment during the third quarter of 2023. The following table provides key credit risk characteristics and macroeconomic variables that the Company uses to estimate the expected credit losses by portfolio segment: Portfolio Segment Risk Characteristics Macroeconomic Variables C&I Age percentage, size at origination, delinquency status, sector and risk rating Unemployment rate, Gross Domestic Product (“GDP”), and U.S. Treasury rates (1) 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 score, delinquency status, maturity date, collateral value, and geographic location Unemployment rate, GDP, and Home Price Indices Other consumer Loss rate approach Immaterial (2) (1) Macroeconomic variables were updated due to model redevelopment. (2) Macroeconomic variables are included in the qualitative estimate. Quantitative Component — Allowance for Loan Losses for the Commercial Loan Portfolio The Company’s C&I lifetime loss rate model estimates the loss rate expected over the life of a loan. This loss rate is applied to the amortized cost basis, excluding accrued interest receivable, 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 through the loan-level lifetime loss rate. To generate estimates of expected loss at the loan level for CRE, multifamily residential, and construction and land loans, projected PDs and LGDs are applied to the estimated exposure at default, considering the term and payment structure of the loan. The forecast of future economic conditions returns to long-run historical economic trends within the reasonable and supportable period. To estimate the life of a loan under both models, the contractual term of the loan is adjusted for estimated prepayments based on historical prepayment experience. Quantitative Component — Allowance for Loan Losses for the Consumer Loan Portfolio For single-family residential and HELOC loans, projected PDs and LGDs are applied to the estimated exposure at default, considering the term and payment structure of the loan, to generate estimates of expected loss at the loan level. The forecast of future economic conditions returns to long-run historical economic trends after the reasonable and supportable period. To estimate the life of a loan for the single-family residential and HELOC loan portfolios, the contractual term of the loan is adjusted for estimated prepayments based on historical prepayment experience. For other consumer loans, the Company uses a loss rate approach. Qualitative Component — The Company also considers the following qualitative factors in the determination of the collectively evaluated allowance if these factors have not already been captured by the quantitative model. Such qualitative factors may include, but are not limited to: – loan growth trends; – the volume and severity of past due financial assets, and the volume and severity of criticized or adversely classified financial assets; – the Company’s lending policies and procedures, including changes in lending strategies, underwriting standards, collection, write-off and recovery practices; – knowledge of a borrower’s operations; – the quality of the Company’s credit review system; – the experience, ability and depth of the Company’s management and associates; – the effect of other external factors such as the regulatory and legal environments, or changes in technology; – actual and expected changes in international, national, regional, and local economic and business conditions in which the Company operates; and – risk factors in certain industry sectors not captured by the quantitative models. The magnitude of the impact of these factors on the Company’s qualitative assessment of the allowance for credit losses changes from period to period according to changes made by management in its assessment of these factors. The extent to which these factors change may be dependent on whether they are already reflected in quantitative loss estimates during the current period and the extent to which changes in these factors diverge from period to period. While the Company’s allowance methodologies str

Investments in Qualified Afford

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities	12 Months Ended
	Dec. 31, 2023
Investments in Qualified Affordable Housing Partnerships, Net [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 CRA encourages banks to meet the credit needs of their communities, particularly low- and moderate-income individuals and 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 consideration 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 15-year minimum compliance period. In addition to affordable housing projects, the Company invests in small business investment companies and new market tax credit projects that qualify for CRA consideration, 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 investments in historic tax credits promote the rehabilitation of historic buildings and economic revitalization of the surrounding areas. For the Company’s accounting policies on tax credit investments, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Securities and Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net in this Form 10-K. For discussion on the Company’s impairment evaluation and monitoring process of tax credit investments, refer to Note 2 — Fair Value Measurement and Fair Value of Financial Instruments — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net to the Consolidated Financial Statements in this Form 10-K. The following table presents the investments and unfunded commitments of the Company’s qualified affordable housing partnerships, tax credit, and other investments, net as of December 31, 2023 and 2022: December 31, 2023 2022 ($ in thousands) Assets Liabilities - Unfunded Commitments (1) Assets Liabilities - Unfunded Commitments (1) Investments in qualified affordable housing partnerships, net $ 419,785 $ 251,746 $ 413,253 $ 266,654 Investments in tax credit and other investments, net 485,251 298,990 350,003 185,797 Total $ 905,036 $ 550,736 $ 763,256 $ 452,451 (1) Included in Accrued expenses and other liabilities on the Consolidated Balance Sheet. Investments in tax credit and other investments, net presented in the table above include equity securities that are mutual funds with readily determinable fair values of $25 million and $24 million, as of December 31, 2023 and 2022, respectively. The Company invests in these mutual funds for CRA purposes. The following table presents additional information related to the investments in qualified affordable housing partnerships, tax credit and other investments for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Investments in qualified housing partnerships, net Tax credits and other tax benefits recognized $ 60,939 $ 52,132 $ 50,643 Amortization expense included in income tax expense $ 43,041 $ 38,759 $ 33,248 Investments in tax credit and other investments, net Amortization of tax credit and other investments (1) $ 120,299 $ 113,358 $ 122,457 Unrealized gains (losses) on equity securities with readily determinable values $ 255 $ (2,958) $ (746) (1) Includes net impairment recoveries of $1 million, $469 thousand and $1 million for the years ended December 31, 2023, 2022 and 2021, respectively. The activity was primarily related to historic and/or energy tax credits. As of December 31, 2023, the Company’s unfunded commitments related to investments in qualified affordable housing partnerships, tax credit and other investments, net are estimated to be funded as follows: ($ in thousands) Amount 2024 $ 339,628 2025 178,171 2026 17,882 2027 2,527 2028 2,115 Thereafter 10,413 Total $ 550,736 Variable Interest Entities The majority of both the investments in affordable housing partnerships and tax credit and other investments discussed above are variable interest entities where the Company is a limited partner in these partnerships, and an unrelated third party is typically the general partner or managing member who has control over the significant activities of these 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 investments due to the general partner’s or managing member’s ability to manage the entity, which is indicative of the general partner’s or managing member’s power over the entity. The Company’s maximum exposure to loss in connection with these partnerships consists of the unamortized investment balance and any tax credits claimed that may become subject to recapture. Other Investments The Company acquired a 49.99% equity interest in Rayliant during the third quarter of 2023. Rayliant is an asset manager specializing in asset allocation and investment in developed and emerging markets. This investment will expand the Bank’s wealth management business and provide its customers with additional access to institutional-quality investment management products and services. The investment in Rayliant is accounted for under the equity method of accounting and is included in Other assets on the Consolidated Balance Sheet. The Company paid $95 million in cash and granted performance-based RSUs that are contingently issuable at vesting. The performance-based RSUs will vest on September 1, 2028 into a variable number of the Company’s shares of common stock, ranging from 20% to 200% of the 349,138 shares initially underlying such performance-based RSUs, based on Rayliant’s achievement of certain financial performance targets during the future performance period. For additional information related to these equity contracts accounted for as derivative liability, refer to Note 2 — Fair Value Measurement and Fair Value of Financial Instruments and Note 5 — Derivatives to the Consolidated Financial Statements in this Form 10-K. The carrying value of the Company's investment in Rayliant was $109 million as of December 31, 2023, of which $101 million was comprised of equity method goodwill. The Company also held equity securities without readily determinable fair values totaling $146 million and $37 million as of December 31, 2023 and 2022, respectively. These equity securities without readily determinable fair values are included in Other Assets

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill Total goodwill was $466 million as of both December 31, 2023 and 2022. The Company’s goodwill impairment test is performed annually, as of December 31, or more frequently as events occur or circumstances change that would more-likely-than-not reduce the fair value of a reporting unit below its carrying value. The Company completed its annual goodwill impairment test as of December 31, 2023 by using a quantitative assessment, and concluded goodwill was not impaired. Additional information pertaining to the Company’s accounting policy for goodwill is summarized in Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Goodwill to the Consolidated Financial Statements in this Form 10-K.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2023
DEPOSIT ACCOUNTS
Deposits	Deposits The following table presents the composition of the Company’s deposits as of December 31, 2023 and 2022: December 31, ($ in thousands) 2023 2022 Deposits: Noninterest-bearing demand $ 15,539,872 $ 21,051,090 Interest-bearing checking 7,558,908 6,672,165 Money market 13,108,727 12,265,024 Savings: Domestic office 1,638,916 2,425,784 Foreign office 202,551 223,253 Time deposits (1) : Domestic office 16,037,287 11,878,734 Foreign office 2,006,177 1,451,799 Total deposits $ 56,092,438 $ 55,967,849 (1) The aggregate amount of time deposits that met or exceeded the deposit insurance limit was $13.6 billion and $10.6 billion as of December 31, 2023 and 2022, respectively. The following table presents the scheduled maturities of time deposits for the five years succeeding December 31, 2023: ($ in thousands) Amount 2024 $ 17,580,178 2025 134,264 2026 186,448 2027 139,279 2028 3,295 Total $ 18,043,464

Short-Term Borrowings and Long-

Short-Term Borrowings and Long-Term Debt	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Short-Term Borrowings and Long-Term Debt	Short-Term Borrowings and Long-Term Debt The following table presents details of the Company’s junior subordinated debt and short-term borrowings as of December 31, 2023 and 2022, December 31, 2023 2022 ($ in thousands) Interest Rate Maturity Dates Amount Amount Parent company Junior subordinated debt (1 ) — floating (2) 7.00% — 7.55% 2034 — 2037 $ 148,249 $ 147,950 Bank Short-term borrowings 4.37% 3/19/2024 $ 4,500,000 $ — (1) The weighted-average contractual interest rates for junior subordinated debt were 6.87% and 3.49% as of December 31, 2023 and 2022, respectively. (2) During the third quarter of 2023, all junior subordinated debt that referenced London Interbank Offered Rate transitioned to a Secured Overnight Financing Rate (“SOFR”)-based replacement rate plus the applicable stated margin. Short-Term Borrowings — Bank Term Funding Program As of December 31, 2023 , the Company’s short-term borrowings consisted of funds from the Bank Term Funding Program (“BTFP”), which was designed by the Federal Reserve to provide additional liquidity to U.S. depository institutions. The advances are limited to the par value of eligible collateral pledged by the borrower, for a term of up to one year. U.S. federally insured depository institutions can request advances under the BTFP until at least March 11, 2024. The Company pledged eligible U.S. government agency and U.S. government-sponsored enterprise debt and mortgage-backed securities, and U.S. Treasury securities as collateral for the borrowings under the BTFP. As of December 31, 2023, the carrying amount of the Company’s pledged securities to the BTFP totaled $4.3 billion with a remaining borrowing capacity of $121 million. In comparison, there were no short-term borrowings as of December 31, 2022. Long-Term Debt — Junior Subordinated Debt As of December 31, 2023, East West had six statutory business trusts for the purpose of issuing junior subordinated debt to third party investors. The junior subordinated debt was issued in connection with the East West’s various pooled trust preferred securities offerings. The Trusts issued both fixed and variable rate capital securities, representing undivided preferred beneficial interests in the assets of the Trusts, to third party investors. East West is the owner of all the beneficial interests represented by the common securities of the Trusts. The junior subordinated debt is recorded as a component of long-term debt and includes the value of the common stock issued by six of East West’s wholly-owned subsidiaries in conjunction with these transactions. The common stock is recorded in Other assets on the Consolidated Balance Sheet for the amount issued in connection with these junior subordinated debt issuances. The proceeds from these issuances represent liabilities of East West to the Trusts and are reported as a component of L o ng-term debt on the Consolidated Balance Sheet. Interest payments on these securities are disbursed quarterly and are deductible for tax purposes. The following table presents the outstanding junior subordinated debt issued by each trust as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Issuer Stated Maturity (1) Stated Interest Rate Current Rate Aggregate Principal Amount of Trust Securities Aggregate Principal Amount of the Junior Subordinated Debt Aggregate Principal Amount of Trust Securities Aggregate Principal Amount of the Junior Subordinated Debt ($ in thousands) East West Capital Trust V November 2034 3-month CME Term SOFR + 2.06% 7.44% $ 464 $ 15,000 $ 464 $ 15,000 East West Capital Trust VI September 2035 3-month CME Term SOFR + 1.76% 7.15% 619 20,000 619 20,000 East West Capital Trust VII June 2036 3-month CME Term SOFR + 1.61% 7.00% 928 30,000 928 30,000 East West Capital Trust VIII June 2037 3-month CME Term SOFR + 1.66% 7.02% 619 18,000 619 18,000 East West Capital Trust IX September 2037 3-month CME Term SOFR + 2.16% 7.55% 928 30,000 928 30,000 MCBI Statutory Trust I December 2035 3-month CME Term SOFR + 1.81% 7.20% 1,083 35,000 1,083 35,000 Total $ 4,641 $ 148,000 $ 4,641 $ 148,000 (1) The debt instruments above mature in more than five years after December 31, 2023 and are subject to call options where early redemption requires appropriate notice.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The following table presents the components of income tax expense (benefit) for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Current income tax expense (benefit): Federal $ 172,428 $ 163,797 $ 84,249 State 173,080 160,629 95,939 Foreign 2,240 3,133 (1,554) Total current income tax expense 347,748 327,559 178,634 Deferred income tax (benefit) expense: Federal (24,319) (23,484) 1,528 State (23,415) (21,835) 3,259 Foreign (1,405) 1,331 (25) Total deferred income tax (benefit) expense (49,139) (43,988) 4,762 Income tax expense $ 298,609 $ 283,571 $ 183,396 The following table presents the reconciliation of the federal statutory rate to the Company’s effective tax rate for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, 2023 2022 2021 Statutory U.S. federal tax rate 21.0 % 21.0 % 21.0 % U.S. state income taxes, net of U.S. federal income tax effect 8.1 7.8 7.4 Tax credits and benefits, net of related expenses (9.9) (8.9) (11.3) Other, net 1.3 0.2 0.3 Effective tax rate 20.5 % 20.1 % 17.4 % The following table summarizes the tax effects of temporary differences that give rise to a significant portion of deferred tax assets and liabilities as of December 31, 2023 and 2022: December 31, ($ in thousands) 2023 2022 Deferred tax assets: Allowance for credit losses and nonperforming assets valuation allowance $ 217,731 $ 191,187 Investments in qualified affordable housing partnerships, tax credit and other investments, net 28,216 21,011 Stock compensation and other accrued compensation 33,169 25,857 Interest income on nonaccrual loans 7,034 5,185 State taxes 9,885 13,259 Net unrealized losses on debt securities and derivatives 242,303 309,837 Premises and equipment 1,782 3,827 Lease liabilities 32,636 34,859 FDIC special assessment charge 22,212 — Other 9,019 6,169 Total deferred tax assets $ 603,987 $ 611,191 Deferred tax liabilities: Equipment lease financing $ 15,564 $ 27,237 Investments in qualified affordable housing partnerships, tax credit and other investments, net 23,103 7,709 FHLB stock dividends 1,947 1,926 Mortgage servicing assets 2,102 1,963 Acquired debts 1,398 1,477 Prepaid expenses 2,981 2,478 Operating lease right-of-use assets 30,272 32,606 Other 7,871 6,270 Total deferred tax liabilities $ 85,238 $ 81,666 Net deferred tax assets $ 518,749 $ 529,525 As of both December 31, 2023 and 2022, the Company concluded that no valuation allowance was necessary to reduce the deferred tax assets since estimated future taxable income will be sufficient to utilize these assets. For further information on the Company’s valuation policy on deferred taxes, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Income Taxes to the Consolidated Financial Statements in this Form 10-K. The following table presents a reconciliation of the beginning and ending balances of unrecognized tax benefits for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Beginning balance $ 477 $ 5,045 $ 5,045 Additions for tax positions related to prior years 459 — — Additions for tax positions related to current year 257 — — Settlements with taxing authorities — (4,568) (1) — Ending balance $ 1,193 $ 477 $ 5,045 (1) In 2022, the Company settled an issue regarding previously claimed tax credits related to DC Solar and affiliates. The Company recognizes interest and penalties, as applicable, related to the underpayment of income taxes as a component of Income tax expense on the Consolidated Statement of Income. The amount of net interest and penalties related to unrecognized tax benefits was immaterial for all periods presented. The Company files federal income tax returns, as well as returns in various state and foreign jurisdictions. We are routinely examined by tax authorities in these various jurisdictions. The Company is subject to federal income tax examination for the tax years 2020 and forward. The Company is also subject to tax examination in various state and local jurisdictions for the tax years 2017 and forward. The Company does not believe that the outcome of unresolved issues or claims in any of the tax jurisdictions is likely to be material on the Company’s Consolidated Financial Statements. The Company believes that adequate provisions have been recorded for all income tax uncertainties consistent with ASC 740, Income Taxes as of December 31, 2023.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments to Extend Credit — In the normal course of business, the Company provides loan commitments and letters of credit to customers 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 from these transactions, commitments to extend credit are included in determining the appropriate level of allowance for unfunded credit commitments. The following table presents the Company’s credit-related commitments as of December 31, 2023 and 2022: December 31, 2023 2022 ($ in thousands) Expire in One Year or Less Expire After One Year Through Three Years Expire After Three Years Through Five Years Expire After Five Years Total Total Loan commitments $ 4,576,927 $ 3,511,660 $ 889,219 $ 163,641 $ 9,141,447 $ 8,211,571 Commercial letters of credit and SBLCs 953,220 387,008 137,758 1,132,775 2,610,761 2,291,966 Total $ 5,530,147 $ 3,898,668 $ 1,026,977 $ 1,296,416 $ 11,752,208 $ 10,503,537 Loan commitments are agreements to lend to customers provided there are no violations of any conditions established in the agreement. Commitments generally have fixed expiration dates or other termination clauses and may require commitment fees. 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 existing accounts. As of December 31, 2023, total letters of credit of $2.6 billion consisted of SBLCs of $2.6 billion and commercial letters of credit of $24 million. In comparison, as of December 31, 2022, total letters of credit of $2.3 billion consisted of SBLCs of $2.3 billion and commercial letters of credit of $22 million. As of both December 31, 2023 and 2022, substantially all SBLCs were graded “Pass” using the Bank’s internal credit risk rating system. 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 risk. Collateral may include cash, accounts receivable, inventory, personal property, plant and equipment, and real estate property. Estimated exposure to loss from these commitments is included in the allowance for unfunded credit commitments, and amounted to $38 million and $26 million as of December 31, 2023 and 2022, respectively. Guarantees — From time to time, the Company sells or securitizes single-family and multifamily residential loans with recourse in the ordinary course of business. The Company is obligated to repurchase up to the recourse component of the loans if the loans default. The following table presents the carrying amounts of loans sold or securitized with recourse and the maximum potential future payments as of December 31, 2023 and 2022: Maximum Potential Future Payments Carrying Value December 31, December 31, 2023 2022 2023 2022 ($ in thousands) Expire in One Year or Less Expire After One Year Through Three Years Expire After Three Years Through Five Years Expire After Five Years Total Total Total Total Single-family residential loans sold or securitized with recourse $ 17 $ 19 $ 28 $ 5,824 $ 5,888 $ 6,781 $ 5,888 $ 6,781 Multifamily residential loans sold or securitized with recourse — — 165 14,831 14,996 14,996 19,020 21,320 Total $ 17 $ 19 $ 193 $ 20,655 $ 20,884 $ 21,777 $ 24,908 $ 28,101 The Company’s recourse reserve related to these guarantees is included in the allowance for unfunded credit commitments and totaled $40 thousand and $37 thousand as of December 31, 2023 and 2022, 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 ordinary 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. While it is impossible to ascertain the ultimate resolution or range of financial liability, based on information known to the Company as of December 31, 2023, the Company does not believe there are any pending legal proceedings to which the Company is a party that, individually or in the aggregate, would reasonably be expected to have a material adverse effect on the Company’s financial condition. In light of the inherent uncertainty in legal proceedings, however, there can be no assurance that the ultimate resolution will not exceed established reserves and it is possible that the outcome of a particular matter, or a combination of matters, may be material to the Company’s financial condition for a particular period, depending upon the size of the loss and the Company’s income for that particular period.

Stock Compensation Plans

Stock Compensation Plans	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock Compensation Plans	Stock Compensation Plans Pursuant to the Company’s 2021 Stock Incentive Plan, as amended, the Company may issue stock, stock options, restricted stock, RSUs including performance-based RSUs, stock purchase warrants, stock appreciation rights, phantom stock and dividend equivalents to eligible employees, non-employee directors, consultants, and other service providers of East West and its subsidiaries. The Company has granted RSUs as its primary incentive awards. There were no outstanding awards other than RSUs as of December 31, 2023, 2022 and 2021. An aggregate of 17 million shares of common stock were authorized under the 2021 Stock Incentive Plan, and the total number of shares available for grant was approximately 4 million as of December 31, 2023. The following table presents a summary of the total share-based compensation expense and the related net tax benefits associated with the Company’s various employee share-based compensation plans for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Stock compensation costs $ 39,867 $ 37,601 $ 32,567 Related net tax benefits for stock compensation plans $ 8,959 $ 5,293 $ 1,760 Restricted Stock Units — RSUs are granted under the Company’s long-term incentive plan at no cost to the recipient. RSUs generally cliff vest after three years of continued employment from the date of the grant, and are authorized to settle in shares of the Company’s common stock. Dividends are accrued during the vesting period and paid at the time of vesting. While a portion of RSUs are time-based vesting awards, others vest subject to attainment of additional specified performance goals, referred to as “performance-based RSUs.” Performance-based RSUs are granted annually upon approval by the Company’s Compensation and Management Development Committee based on the performance in the year prior to the grant date of the award. The number of awards that vest can range from zero percent to a maximum of 200% of the granted number of awards based on the Company’s achievement of specified performance criteria over a performance period of three years. For information on accounting on stock-based compensation plans, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Stock-Based Compensation to the Consolidated Financial Statements in this Form 10-K. The following table presents a summary of the activities for the Company’s time-based and performance-based RSUs that were settled in shares for the year ended December 31, 2023. The number of performance-based RSUs stated below reflects the number of awards granted on the grant date: Time-Based RSUs Performance-Based RSUs Shares Weighted-Average Grant Date Fair Value Shares Weighted-Average Grant Date Fair Value Outstanding, January 1, 2023 1,296,866 $ 60.77 332,510 $ 60.40 Granted 515,218 $ 73.13 96,271 $ 79.93 Vested (543,032) $ 40.93 (152,558) $ 39.79 Forfeited (62,534) $ 74.04 — $ — Outstanding, December 31, 2023 1,206,518 $ 74.29 276,223 $ 78.59 The weighted-average grant date fair value of the time-based RSUs granted during the years ended December 31, 2023, 2022, and 2021 was $73.13, $78.15, and $71.88, respectively. The weighted-average grant date fair value of the performance-based RSUs granted during the years ended December 31, 2023, 2022 and 2021 was $79.93, $77.91 and $77.67, respectively. The total fair value of time-based RSUs that vested during the years ended December 31, 2023, 2022 and 2021 was $39 million, $30 million and $23 million, respectively. The total fair value of performance-based RSUs that vested during the years ended December 31, 2023, 2022, and 2021 was $21 million, $18 million and $15 million, respectively. As of December 31, 2023, there were $28 million of unrecognized compensation costs related to unvested time-based RSUs expected to be recognized over a weighted-average period of 1.76 years, and $15 million of unrecognized compensation costs related to unvested performance-based RSUs expected to be recognized over a weighted-average period of 1.77 years. Employee Stock Purchase Plan — The 1998 Employee Stock Purchase Plan (the “Purchase Plan”) provides eligible employees of the Company the right to purchase shares of its common stock at a discount. Employees can purchase shares at 90% of the fair market price subject to an annual purchase limitation of $22,500 per employee. As of December 31, 2023, the Purchase Plan qualifies as a non-compensatory plan under Section 423 of the Internal Revenue Code and, accordingly, no compensation expense has been recognized. 2,000,000 shares of the Company’s common stock were authorized for sale under the Purchase Plan. During the years ended December 31, 2023 and 2022, 65,971 shares totaling $3 million and 48,990 shares totaling $3 million, respectively, were sold to employees under the Purchase Plan. As of December 31, 2023, there were 151,814 shares available under the Purchase Plan.

Stockholders_ Equity and Earnin

Stockholders’ Equity and Earnings Per Share	12 Months Ended
	Dec. 31, 2023
Equity [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 years ended December 31, 2023, 2022 and 2021. 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 in this Form 10-K. Year Ended December 31, ($ and shares in thousands, except per share data) 2023 2022 2021 Basic: Net income $ 1,161,161 $ 1,128,083 $ 872,981 Weighted-average number of shares outstanding 141,164 141,326 141,826 Basic EPS $ 8.23 $ 7.98 $ 6.16 Diluted: Net income $ 1,161,161 $ 1,128,083 $ 872,981 Weighted-average number of shares outstanding 141,164 141,326 141,826 Add: Diluted impact of unvested RSUs 738 1,166 1,314 Diluted weighted-average number of shares outstanding 141,902 142,492 143,140 Diluted EPS $ 8.18 $ 7.92 $ 6.10 For the years ended December 31, 2023, 2022 and 2021, approximately 283 thousand, 3 thousand and 6 thousand weighted-average shares of anti-dilutive RSUs, respectively, were excluded from the diluted EPS computation. Stock Repurchase Program — In 2020, the Company’s Board of Directors authorized a stock repurchase program to buy back up to 500 million of the Company’s common stock. In 2023, the Company repurchased 1,506,091 shares at an average price of $54.56 per share at a total cost of $82 million. In 2022, the Company repurchased 1,385,517 shares at an average price of $72.17 per share at a total cost of $100 million. The Company did not repurchase any shares in 2021. As of December 31, 2023, the Company had approximately $172 million available for repurchases under its stock repurchase program.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The following table presents the changes in the components of AOCI balances for the years ended December 31, 2023, 2022 and 2021: ($ in thousands) Debt Securities (1) Cash Flow Hedges Foreign Currency Translation Adjustments (2) Total Balance, December 31, 2020 $ 52,247 $ (1,230) $ (6,692) $ 44,325 Net unrealized (losses) gains arising during the period (136,846) 866 1,757 (134,223) Amounts reclassified from AOCI (1,104) 621 — (483) Changes, net of tax (137,950) 1,487 1,757 (134,706) Balance, December 31, 2021 $ (85,703) $ 257 $ (4,935) $ (90,381) Net unrealized losses arising during the period (620,870) (52,623) (16,348) (689,841) Amounts reclassified from AOCI 11,758 2,835 — 14,593 Changes, net of tax (609,112) (49,788) (16,348) (675,248) Balance, December 31, 2022 $ (694,815) $ (49,531) $ (21,283) $ (765,629) Net unrealized gains (losses) arising during the period 76,930 (4,277) (56) 72,597 Amounts reclassified from AOCI 16,004 56,432 — 72,436 Changes, net of tax 92,934 52,155 (56) 145,033 Balance, December 31, 2023 $ (601,881) $ 2,624 $ (21,339) $ (620,596) (1) Includes after-tax unamortized losses related to AFS debt securities that were transferred to HTM in 2022. (2) 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 table presents the components of other comprehensive income (loss), reclassifications to net income and the related tax effects for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, 2023 2022 2021 ($ in thousands) Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax Debt securities: Net unrealized gains (losses) on AFS debt securities arising during the period $ 109,216 $ (32,286) $ 76,930 $ (721,100) $ 213,221 $ (507,879) $ (194,393) $ 57,547 $ (136,846) Unrealized losses on debt securities transferred from AFS to HTM — — — (160,416) 47,425 (112,991) — — — Reclassification adjustments: Net realized losses (gains) on AFS debt securities reclassified into net income (1) 6,862 (2) (2,029) 4,833 (1,306) 386 (920) (1,568) 464 (1,104) Amortization of unrealized losses on transferred securities (3) 15,860 (4,689) 11,171 18,000 (5,322) 12,678 — — — Net change 131,938 (39,004) 92,934 (864,822) 255,710 (609,112) (195,961) 58,011 (137,950) Cash flow hedges: Net unrealized (losses) gains arising during the period (5,767) 1,490 (4,277) (74,069) 21,446 (52,623) 1,210 (344) 866 Net realized losses reclassified into net income (4) 79,843 (23,411) 56,432 4,004 (1,169) 2,835 868 (247) 621 Net change 74,076 (21,921) 52,155 (70,065) 20,277 (49,788) 2,078 (591) 1,487 Foreign currency translation adjustments, net of hedges: Net unrealized gains (losses) arising during the period 698 (754) (56) (15,059) (1,289) (16,348) 463 1,294 1,757 Net change 698 (754) (56) (15,059) (1,289) (16,348) 463 1,294 1,757 Other comprehensive income (loss) $ 206,712 $ (61,679) $ 145,033 $ (949,946) $ 274,698 $ (675,248) $ (193,420) $ 58,714 $ (134,706) (1) Pre-tax amounts were reported in Net (losses) gains on AFS debt securities on the Consolidated Statement of Income. (2) Represents the net loss related to an AFS debt security that was written-off in the first quarter of 2023 and subsequently sold during the fourth quarter of 2023. (3) Represents unrealized losses amortized over the remaining lives of securities that were transferred from the AFS to HTM portfolio in 2022. (4) Pre-tax amounts related to cash flow hedges on variable rate loans and long-term borrowings, where applicable, were reported in Interest and dividend income and in Interest expense, respectively , on the Consolidated Statement of Income. In 2023, pre-tax amount also includes the terminated cash flow hedge where the forecasted cash flows were no longer probable to occur and was reported in Noninterest income on the Consolidated Statement of Income.

Regulatory Requirements and Mat

Regulatory Requirements and Matters	12 Months Ended
	Dec. 31, 2023
Banking and Thrift, Interest [Abstract]
Regulatory Requirements and Matters	Regulatory Requirements and Matters The Company and the Bank are subject to regulatory capital adequacy requirements administered by the respective federal banking agencies. The Bank is a member bank of the Federal Reserve System and is primarily regulated by the Federal Reserve and the California Department of Financial Protection and Innovation. The Company and the Bank are required to comply with the Basel III Capital Rules adopted by the federal banking agencies. As standardized approaches institutions, the Basel III Capital Rules require that banking organizations, such as the Company and the Bank, to maintain a minimum Common Equity Tier 1 (“CET1”) capital ratio of at least 4.5%, a Tier 1 capital ratio of at least 6.0%, a total capital ratio of at least 8.0%, and a Tier 1 leverage ratio of a least 4.0% to be considered adequately capitalized. Failure to meet the minimum capital requirements can result in certain mandatory actions and possibly additional discretionary actions by the regulators that, if undertaken, could have a direct material effect on the Company’s Consolidated Financial Statements. The Company and the Bank are also subject to maintaining a capital conservation buffer of 2.5% above the minimum risk-based capital ratios under the Basel III Capital Rules. Banking institutions with a ratio of CET1 to risk-weighted assets above the minimum but which does not exceed the capital conservation buffer will face constraints on dividends, share repurchases and executive compensation based on the amount of the shortfall. The Federal Deposit Insurance Corporation Improvement Act of 1991 requires that the federal regulatory agencies adopt regulations defining capital categories for banks: well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized and critically undercapitalized. Under the agencies’ Prompt Corrective Action regulations, failure of a bank to be well capitalized results in an escalating series of adverse regulatory consequences. Effective January 1, 2020, the Company adopted the ASU 2016-13 Financial Instruments — Credit Losses (Topic 326) Measurement of Credit Losses on Financial instrument that introduced the CECL methodology . In March 2020, the federal banking agencies issued the Interim Final Rule that provided banking organizations that adopted the CECL with the phase-in option to delay the estimated impact of CECL on regulatory capital. The Bank and the Company have elected the CECL phase-in option in 2020 and delayed the impact of CECL on regulatory capital through 2021, after which the effects are being phased in over a three-year period from January 1, 2022 through December 31, 2024. As of both December 31, 2023 and 2022, the Company and the Bank were both categorized as well capitalized based on applicable U.S. regulatory capital ratio requirements in accordance with Basel III standardized approaches, as set forth in the table below. The Company believes that no changes in conditions or events have occurred since December 31, 2023, which would result in changes that would cause the Company or the Bank to fall below the well capitalized level. The following table presents the regulatory capital information of the Company and the Bank as of December 31, 2023 and 2022: Basel III December 31, 2023 December 31, 2022 ($ in thousands) Amount Ratio Amount Ratio Minimum Capital Ratios Fully Phased-in Minimum Capital Ratios (2) Well-Capitalized Requirement Total capital (to risk-weighted assets) Company $ 7,919,407 14.8 % $ 7,003,299 14.0 % 8.0 % 10.5 % 10.0 % East West Bank $ 7,363,575 13.8 % $ 6,760,612 13.5 % 8.0 % 10.5 % 10.0 % Tier 1 capital (to risk-weighted assets) Company $ 7,140,778 13.3 % $ 6,347,108 12.7 % 6.0 % 8.5 % 6.0 % East West Bank $ 6,732,946 12.6 % $ 6,252,421 12.5 % 6.0 % 8.5 % 8.0 % CET1 capital (to risk-weighted assets) Company (1) $ 7,140,778 13.3 % $ 6,347,108 12.7 % 4.5 % 7.0 % N/A East West Bank $ 6,732,946 12.6 % $ 6,252,421 12.5 % 4.5 % 7.0 % 6.5 % Tier 1 leverage capital (to adjusted average assets) Company (1) $ 7,140,778 10.2 % $ 6,347,108 9.8 % 4.0 % 4.0 % N/A East West Bank $ 6,732,946 9.6 % $ 6,252,421 9.7 % 4.0 % 4.0 % 5.0 % Risk-weighted assets Company $ 53,663,392 N/A $ 50,036,719 N/A N/A N/A N/A East West Bank $ 53,539,980 N/A $ 50,024,772 N/A N/A N/A N/A Adjusted quarterly average total assets Company $ 70,406,008 N/A $ 65,221,597 N/A N/A N/A N/A East West Bank $ 70,270,449 N/A $ 65,198,267 N/A N/A N/A N/A N/A — Not applicable. (1) The well-capitalized requirements for CET1 capital and Tier 1 leverage capital apply only to the Bank since there is no CET1 capital ratio or Tier 1 leverage capital ratio component in the definition of a well-capitalized bank holding company. (2) Includes a 2.5% capital conservation buffer requirement above the minimum risk-based capital ratios.

Business Segments

Business Segments	12 Months Ended
	Dec. 31, 2023
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. The Consumer and Business Banking segment primarily provides financial products and services to consumer and commercial customers through the Company’s domestic branch network and digital banking platforms. 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, interest rate risk hedging and foreign exchange services. The Commercial Banking segment primarily generates commercial loan and deposit products. Commercial loan products include CRE lending, construction financing, commercial business lending, working capital lines of credit, trade finance, letters of credit, affordable housing lending, asset-based lending, asset-backed finance, project finance 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 revenues 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 recorded to the segment directly associated with the respective loans charged off, and provision for credit losses is recorded to the segments based on the related loans for which allowances are evaluated. 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 the Company’s liquidity and interest rate management, and the internal FTP process. The FTP 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 providing 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. The following tables present the operating results and other key financial measures for the individual operating segments as of and for the years ended December 31, 2023, 2022 and 2021: ($ in thousands) Consumer and Business Banking Commercial Banking Other Total Year Ended December 31, 2023 Net interest income before provision for credit losses $ 1,238,829 $ 992,519 $ 80,906 $ 2,312,254 Provision for credit losses 18,422 106,578 — 125,000 Noninterest income 102,109 174,465 18,690 295,264 Noninterest expense 477,622 382,865 162,261 1,022,748 Segment income (loss) before income taxes 844,894 677,541 (62,665) 1,459,770 Segment net income $ 596,366 $ 478,418 $ 86,377 $ 1,161,161 As of December 31, 2023 Segment assets $ 19,510,836 $ 35,095,237 $ 15,006,811 $ 69,612,884 ($ in thousands) Consumer and Business Banking Commercial Banking Other Total Year Ended December 31, 2022 Net interest income (loss) before provision for credit losses $ 1,170,850 $ 892,386 $ (17,355) $ 2,045,881 Provision for credit losses 27,197 46,303 — 73,500 Noninterest income 110,139 179,248 9,279 298,666 Noninterest expense 397,882 314,185 147,326 859,393 Segment income (loss) before income taxes 855,910 711,146 (155,402) 1,411,654 Segment net income $ 608,120 $ 507,467 $ 12,496 $ 1,128,083 As of December 31, 2022 Segment assets $ 17,385,804 $ 33,042,785 $ 13,683,561 $ 64,112,150 ($ in thousands) Consumer and Business Banking Commercial Banking Other Total Year Ended December 31, 2021 Net interest income before reversal of provision for credit losses $ 697,101 $ 766,202 $ 68,268 $ 1,531,571 Reversal of provision for credit losses (4,998) (30,002) — (35,000) Noninterest income 94,125 163,768 28,002 285,895 Noninterest expense 364,635 275,649 155,805 796,089 Segment income (loss) before income taxes 431,589 684,323 (59,535) 1,056,377 Segment net income $ 308,630 $ 489,233 $ 75,118 $ 872,981 As of December 31, 2021 Segment assets $ 14,961,809 $ 28,556,706 $ 17,352,186 $ 60,870,701

Parent Company Condensed Financ

Parent Company Condensed Financial Statements	12 Months Ended
	Dec. 31, 2023
Condensed Financial Information Disclosure [Abstract]
Parent Company Condensed Financial Statements	Parent Company Condensed Financial Statements The following tables present the Parent Company-only condensed financial statements: CONDENSED BALANCE SHEET December 31, ($ in thousands) 2023 2022 ASSETS Cash and cash equivalents due from subsidiary bank $ 445,770 $ 228,531 Investments in subsidiaries: Bank 6,542,852 5,889,775 Nonbank 13,502 13,846 Investments in tax credit investments, net — 1,925 Other assets 120,742 8,516 TOTAL $ 7,122,866 $ 6,142,593 LIABILITIES AND STOCKHOLDERS’ EQUITY Long-term debt $ 148,249 $ 147,950 Other liabilities 23,783 10,031 Stockholders’ equity 6,950,834 5,984,612 TOTAL $ 7,122,866 $ 6,142,593 CONDENSED STATEMENT OF INCOME Year Ended December 31, ($ in thousands) 2023 2022 2021 Dividends from subsidiaries: Bank $ 704,000 $ 240,000 $ 200,000 Nonbank 322 157 82 Other investment losses (2,738) — — Other income — — 11 Total income 701,584 240,157 200,093 Interest expense on long-term debt 10,889 5,450 2,974 Compensation and employee benefits 7,204 6,708 6,370 (Impairment recoveries) amortization of tax credit and other investments (2,901) (786) 425 Other expense 1,815 2,040 1,306 Total expense 17,007 13,412 11,075 Income before income tax benefit and equity in undistributed income of subsidiaries 684,577 226,745 189,018 Income tax benefit 5,844 4,269 3,005 Undistributed earnings of subsidiaries, primarily bank 470,740 897,069 680,958 Net income $ 1,161,161 $ 1,128,083 $ 872,981 CONDENSED STATEMENT OF CASH FLOWS Year Ended December 31, ($ in thousands) 2023 2022 2021 CASH FLOWS FROM OPERATING ACTIVITIES Net income $ 1,161,161 $ 1,128,083 $ 872,981 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed earnings of subsidiaries, principally bank (470,740) (897,069) (680,958) Deferred income tax expense (benefit) 948 (2,193) 2,721 Net change in other assets (4,160) 4,250 (5,685) Net change in other liabilities (47) 779 (81,706) Other operating activities, net 2,443 1,333 1,877 Net cash provided by operating activities 689,605 235,183 109,230 CASH FLOWS FROM INVESTING ACTIVITIES Net increase in investments in tax credit investments — (1,612) (346) Distributions received from equity method investees 1,594 410 436 Other investing activities, net (96,689) (6,188) (1,476) Net cash used in investing activities (95,095) (7,390) (1,386) CASH FLOWS FROM FINANCING ACTIVITIES Common stock: Proceeds from issuance pursuant to various stock compensation plans and agreements 3,208 3,178 2,573 Stock tendered for payment of withholding taxes (23,751) (19,087) (15,702) Repurchase of common stock pursuant to the stock repurchase program (82,174) (99,990) — Cash dividends paid (274,554) (228,381) (188,762) Net cash used in financing activities (377,271) (344,280) (201,891) Net increase (decrease) in cash and cash equivalents 217,239 (116,487) (94,047) Cash and cash equivalents, beginning of year 228,531 345,018 439,065 Cash and cash equivalents, end of year $ 445,770 $ 228,531 $ 345,018

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Declaration of Dividend — On January 23, 2024, the Company’s Board of Directors declared first quarter 2024 cash dividends for the Company’s common stock. The common stock cash dividend of $0.55 per share was paid on February 15, 2024 to stockholders of record as of February 2, 2024. Redemption of Junior Subordinated Debt and Trust Preferred Securities Issued by East West Capital Trusts — In January 2024, the Company provided notice that it would redeem $113 million of the principal face value of junior subordinated debt and $4 million of the principal face value of trust preferred securities issued by the East West Capital Trusts. Of these amounts, $16 million was redeemed in February 2024 and the remaining $101 million is scheduled to be redeemed in March 2024. Increase in FDIC Special Assessment — In November 2023, the FDIC approved a final rule to implement a special deposit insurance assessment to recover losses to the DIF arising from the protection of uninsured depositors following the receiverships of failed institutions in the spring of 2023 . The Company recorded a pre-tax $70 million special assessment charge based on the November 2023 final rule. In February 2024, the FDIC estimated the losses attributable to the protection of uninsured depositors at Silicon Valley Bank and Signature Bank to increase approximately $4.1 billion from $16.3 billion, as described in the November 2023 final rule, to $20.4 billion. As the loss estimates resulting from the failures of Silicon Valley Bank and Signature Bank may be further subject to change pending the projected and actual outcome of loss share agreements, joint ventures, and outstanding litigation, the exact amount of losses incurred will be determined when the FDIC terminates the receiverships. As of the date of this filing, the Bank cannot reasonably estimate whether the FDIC’s increased estimate of losses attributable to the protection of uninsured depositors will result in an increase in or modifications to the Bank’s special assessment charge. The FDIC plans to provide depository institutions that are subject to the special assessment with an updated estimate of each institution’s quarterly and total special assessment expense with its first quarter 2024 special assessment invoice in June 2024.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net income	$ 1,161,161	$ 1,128,083	$ 872,981

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation — The accounting and reporting policies of the Company conform with the U.S. Generally Accepted Accounting Principles (“GAAP”), applicable guidelines prescribed by regulatory authorities and common practices in the banking industry. The preparation of the Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the Consolidated Financial Statements, income and expenses during the reporting period, and the related disclosures. Actual results could differ materially from those estimates. Certain items on the Consolidated Financial Statements and notes for the prior years have been reclassified to conform to the 2023 presentation.
Principles of Consolidation	Principles of Consolidation — The Consolidated Financial Statements in this Form 10-K include the accounts of East West and its subsidiaries that are majority owned and in which the Company has a controlling financial interest. In accordance with the applicable accounting guidance for consolidation, the Company first determines if it has a variable interest in the entity. A variable interest entity (“VIE”) is an entity that lacks equity investors or whose equity investors do not have a controlling financial interest in the entity through their equity investments. If it is determined that the Company does not have a variable interest in the entity, no further analysis is required and the entity is not consolidated. The Company consolidates a VIE when the Company has a controlling financial interest in the entity and therefore is deemed to be the primary beneficiary. The primary beneficiary of a VIE is determined if the Company has: i) both the power and ability to direct activities of the VIE that most significantly affect the entity’s economic performance; and ii) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE. For an entity that does not meet the definition of a VIE, the entity is determined to be a voting interest entity. The Company consolidates a voting interest entity if it can exert control over the financial and operating policies of an investee, which can occur if the Company has a more than 50% voting interest in the entity. For unconsolidated voting interest entities or VIE, the Company uses the equity, cost or measurement alternative method based on the Company’s voting or economic interest. Intercompany transactions and accounts have been eliminated in consolidation. East West also has six wholly-owned subsidiaries that are statutory business trusts (the “Trusts”). In accordance with Financial Accounting Standards Board Accounting Standards Codification (“ASC”) Topic 810, Consolidation, the Trusts are not included in the Consolidated Financial Statements.
Cash and Cash Equivalents	Cash and Cash Equivalents — Cash and cash equivalents include cash on hand, cash items in transit, cash due from the Federal Reserve Bank of San Francisco (“FRBSF”) and other financial institutions, and federal funds sold with original maturities up to three months.
Interest-Bearing Deposits with Banks	Interest-Bearing Deposits with Banks — Interest-bearing deposits with banks include cash placed with other banks with original maturities greater than three months and less than one year.
Assets Purchased under Resale Agreements and Assets Sold under Repurchase Agreements	Assets Purchased under Resale Agreements and Assets Sold under Repurchase Agreements
Securities	Securities — The Company’s securities include various debt securities, marketable and non-marketable equity securities. Debt securities are recorded on the Consolidated Balance Sheet as of their trade dates. The Company initially classifies its debt securities as trading securities, AFS or HTM debt securities based on management’s intention on the date of the purchase. Debt securities are purchased for liquidity and investment purposes, as part of asset/liability management and other strategic activities. Debt securities for which the Company has the positive intention and ability to hold until maturity are classified as HTM and are carried at amortized cost, net of allowance for credit losses. Debt securities not classified as trading securities or HTM securities are classified as AFS. AFS debt securities are reported at fair value, net of the allowance for credit losses, with unrealized gains and losses recorded in AOCI, net of applicable income taxes. For details of the allowance for credit losses on debt securities, refer to the Allowance for Credit Losses on Available-for-Sale and Held-to-Maturity Debt Securities sections of this note. Interest income, including any amortization of premium or accretion of discount, is included in net income. The Company recognizes realized gains and losses on the sale of AFS debt securities in earnings, using the specific identification method. Upon transfer of a debt security from the AFS to HTM category, the security’s new amortized cost is reset to fair value, reduced by any previous write-offs but excluding any allowance for credit losses. Unrealized gains or losses at the date of transfer of these securities continue to be reported in AOCI and are amortized into interest income over the remaining life of the securities as effective yield adjustments, in a manner consistent with the amortization or accretion of the original purchase premium or discount on the associated security. For transfers of securities from the AFS to HTM category, any allowance for credit losses that was previously recorded under the AFS model is reversed and an allowance for credit losses is subsequently recorded under the HTM debt security model. The reversal and re-establishment of the allowance for credit losses are recorded in the provision for credit losses. Marketable equity securities with readily determinable fair values are recorded at fair value with unrealized gains and losses due to changes in fair value; and are included in Other investment income on the Consolidated Statement of Income. Marketable equity securities include mutual fund investments, which are included in Investments in qualified affordable housing partnership, tax credit and other investments, net on the Consolidated Balance Sheet. Non-marketable equity securities including tax credit investments, and other equity investments that do not have readily determinable fair values are recorded in Investments in qualified affordable housing partnership, tax credit and other investments, net, and Other assets on the Consolidated Balance Sheet and are accounted for under one of the following accounting methods: • Equity Method — When the Company has the ability to exercise significant influence over the investee. • Cost Method — The cost method is applied to restricted equity securities held for membership and regulatory purposes, such as FRBSF and FHLB stock. These investments are held at their cost minus impairment. If impaired, the carrying value is written down to the fair value of the security. • Measurement Alternative — This method is applied to all remaining non-marketable equity securities. These securities are carried at cost adjusted for impairment, if any, plus or minus observable price changes in orderly transactions of an identical or similar security of the same issuer. The Company’s impairment review for equity method, cost method and measurement alternative securities typically includes an analysis of the facts and circumstances of each security, the intent or requirement to sell the security, the expectations of cash flows, capital needs and the viability of its business model. For equity method and cost method investments, the Company reduces the asset’s carrying value when the Company considers declines in value to be other-than-temporary impairment (“OTTI”). For securities accounted for under the measurement alternative, the Company reduces the asset value when the fair value is less than the carrying value, without the consideration of recovery.
Loans Held-for-Sale	Loans Held-for-Sale — Loans are initially classified as loans held-for-sale when they are individually identified as being available for immediate sale and management has committed to a formal plan to sell them. Loans held-for-sale are carried at lower of cost or fair value. Subject to periodic review under the Company’s evaluation process, including asset/liability and credit risk management, the Company may transfer certain loans from held-for-investment to held-for-sale measured at lower of cost or fair value. Any write-downs in the carrying amount of the loan at the date of transfer are recorded as charge-offs to allowance for loan losses. Loan origination fees on loans held-for-sale, net of certain costs in processing and closing the loans, are deferred until the time of sale and are included in the periodic determination of the lower of cost or fair value adjustments and/or the gain or loss recognized at the time of sale. A valuation allowance is established if the fair value of such loans is lower than their cost, with a corresponding charge to noninterest income. If the loan or a portion of the loan cannot be sold, it is subsequently transferred back to the loans held-for-investment portfolio from the loans held-for-sale portfolio at the lower of cost or fair value on the transfer date.
Loans Held-for-Investment	Loans Held-for-Investment — At the time of commitment to originate or purchase a loan, the 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. Loans held-for-investment are stated at their outstanding principal, reduced by an allowance for loan losses and net of deferred loan fees or costs, or unearned fees on originated loans, net of unamortized premiums or unaccreted discounts on purchased loans. Nonrefundable fees and direct costs associated with the origination or purchase of loans are deferred and netted against outstanding loan balances. The deferred net loan fees and costs are recognized in interest income as an adjustment to yield over the loan term using the effective interest method. Discounts/premiums on purchased loans are accreted/amortized to interest income using the effective interest method over the remaining contractual maturity. Interest on loans is calculated using the simple-interest method on daily balances of the principal amounts outstanding. Generally, loans are placed on nonaccrual status when they become 90 days past due or more. Loans are considered past due when contractually required principal or interest payments have not been made on the due dates. Loans are also placed on nonaccrual status when management believes, after considering economic and business conditions and collection efforts, that the borrower’s financial condition is such that full collection of principal or interest becomes uncertain, regardless of the length of past due status. Once a loan is placed on nonaccrual status, interest accrual is discontinued and all unpaid accrued interest is reversed against interest income. Interest payments received on nonaccrual loans are reflected as a reduction of principal and not as interest income. A loan is returned to accrual status when the borrower has demonstrated a satisfactory payment trend subject to management’s assessment of the borrower’s ability to repay the loan.
Loan Modifications	Loan Modifications — Certain loans are modified in the normal course of business for competitive reasons or in conjunction with the Company’s loss mitigation activities. Upon the adoption of ASU 2022-02 on January 1, 2023, the Company applies the general loan modification guidance provided in ASC 310-20 to all loan modifications, including modifications made to borrowers experiencing financial difficulty. Under the general loan modification guidance, a modification is treated as a new loan only if the following two conditions are met: (1) the terms of the new loan are at least as favorable to the Company as the terms for comparable loans to other customers with similar collection risks; and (2) modifications to the terms of the original loan are more than minor. If either condition is not met, the modification is accounted for as a continuation of the existing loan with any effect of the modification treated as a prospective adjustment to the loan’s effective interest rate. A modification made to borrowers experiencing financial difficulty may vary by program and by borrower-specific characteristics, and may include rate reductions, principal forgiveness, term extensions, and payment delays, and is intended to minimize the Company’s economic loss and to avoid foreclosure or repossession of collateral. The Company applies the same credit loss methodology it uses for similar loans that were not modified.
Troubled Debt Restructuring	Troubled Debt Restructurings — Prior to the adoption of ASU 2022-02, a loan was generally classified as a troubled debt restructuring (“TDR”) when the Company, for economic or legal reasons related to the borrower’s financial difficulties, granted a concession to the borrower that the Company would not otherwise consider. The concessions may be granted in various forms, including a below-market change in the stated interest rate, a reduction in the loan balance or accrued interest, a term extension, a payment forbearance and other actions. Loans with contractual terms that were modified as a TDR and were current at the time of restructuring may remain on accrual status if there was demonstrated performance prior to the restructuring and payment in full under the restructured terms was expected. Otherwise, these loans were placed on nonaccrual status and were reported as nonperforming, until the borrower demonstrated a sustained period of performance, generally six months, and the ability to repay the loan according to the contractual terms. If accruing TDRs ceased to perform in accordance with their modified contractual terms, they were placed on nonaccrual status and reported as nonperforming TDRs. TDRs were included in the quarterly allowance for credit losses valuation process.
Allowance for Credit Losses	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; it is increased by the provision for credit losses and decreased by net charge-offs. The allowance for loan losses is evaluated quarterly by management based on regular reviews of the collectability of the Company’s loans, and more often if deemed necessary. The Company develops and documents the allowance for loan losses methodology at the portfolio segment level. The commercial loan portfolio is comprised of commercial and industrial (“C&I”), commercial real estate (“CRE”), multifamily residential, and construction and land loans; and the consumer loan portfolio is comprised of single-family residential, home equity lines of credit (“HELOCs”), and other consumer loans. The allowance for loan losses represents the portion of a loan’s amortized cost basis that the Company does not expect to collect due to anticipated credit losses over the loan’s contractual life, adjusted for prepayments. 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 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 loans do not share similar risk characteristics, the Company evaluates the loan for expected credit losses on an individual basis. Individually assessed loans include nonaccrual loans. The Company evaluates loans for expected credit losses on an individual basis 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. When the loan is deemed uncollectible, it is the Company’s policy to charge off the uncollectible amount against the allowance for loan losses. 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 loan 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 Company considers both the likelihood that funding will occur, and 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 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 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 the 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 — For each reporting period, each AFS debt security that is in an unrealized loss position is 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 of the AFS debt security, excluding accrued interest. 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 AFS 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 security’s ratings and other qualitative factors. For AFS debt securities that are guaranteed or issued by the U.S. government, or government-sponsored enterprises of high credit quality, the Company 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 not to 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 Credit Losses on Held-to-Maturity Debt Securities — For each major HTM debt security type, the allowance for credit losses is estimated collectively for groups of securities with similar risk characteristics. For securities that do not share similar risk characteristics, the losses are estimated individually. The Company applies a zero credit loss assumption to certain HTM debt securities, including debt securities that are either guaranteed or issued by the U.S. government or government-sponsored enterprises, are highly rated by nationally recognized statistical rating organizations (“NRSROs”), and have a long history of no credit losses. Any expected credit loss is recorded through the allowance for credit losses and deducted from the amortized cost basis of the security, reflecting the net amount the Company expects to collect. The amortized cost of the Company’s HTM debt securities excludes accrued interest, which is included in Other assets on the Consolidated Balance Sheet. The Company has made an accounting policy election not to recognize an allowance for credit losses for accrued interest receivables on HTM debt securities, as the Company reverses any accrued interest against interest income if a debt security is placed on nonaccrual status. The criteria used to place HTM debt securities on nonaccrual are largely similar to those described for loans. Any cash collected on nonaccrual HTM debt securities is applied to reduce the security’s amortized cost basis and not as interest income. Generally, the Company returns an HTM security to accrual status when all delinquent interest and principal become current under the contractual terms of the security, and the collectability of remaining principal and interest is no longer doubtful. 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 less the cost to sell, to the amortized cost basis of the related financial asset at the reporting date. Other than 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 — Purchased assets that have experienced a more-than-insignificant deterioration in credit quality since origination are deemed Purchased Credit Deteriorated (“PCD”) assets. For PCD HTM 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. Under this approach, 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 non-credit 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. Allowance for Credit Losses The Company has a current expected credit losses (“CECL”) framework for all financial assets measured at amortized cost and certain off-balance sheet credit exposures. The Company’s allowance for credit losses, which includes both the allowance for loan losses and the allowance for unfunded credit commitments, is calculated with the objective of maintaining a reserve sufficient to absorb losses inherent in our credit portfolios. The measurement of the allowance for credit losses is based on management’s best estimate of lifetime expected credit losses, periodic evaluation of the loan portfolio, lending-related commitments and other relevant factors. The allowance for credit losses is deducted from the amortized cost basis of a financial asset or a group of financial assets so that the balance sheet reflects the net amount the Company expects to collect. Amortized cost is the principal balance outstanding, net of purchase premiums and discounts, deferred fees and costs, and escrow advances. Subsequent changes in expected credit losses are recognized in net income as a provision for, or a reversal of, credit loss expense. The allowance for credit losses estimation involves procedures to consider the unique risk characteristics of the portfolio segments. The majority of the Company’s credit exposures that share risk characteristics with other similar exposures are collectively evaluated. The collectively evaluated loans include performing loans and unfunded credit commitments. If an exposure does not share risk characteristics with other exposures, the Company generally estimates expected credit losses on an individual basis. Allowance for Collectively Evaluated Loans The allowance for collectively evaluated loans consists of a quantitative component that assesses the different risk factors considered in our models and a qualitative component that considers risk factors external to the models. Each of these components are described below. Quantitative Component — The Company applies quantitative methods to estimate loan losses by considering a variety of factors such as historical loss experience, the current credit quality of the portfolio, and an economic outlook over the life of the loan. The Company incorporates forward-looking information using macroeconomic scenarios which 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 downside or upside scenarios reflecting possible worsening or improving economic conditions. The quantitative models incorporate a probability-weighted calculation of these macroeconomic scenarios over a reasonable and supportable forecast period. If the life of the loans extends beyond the reasonable and supportable forecast period, the Company will consider historical experience or long-run macroeconomic trends over the remaining life of the loans to estimate the allowance for loan losses. There were no changes to the reasonable and supportable forecast period, except to the C&I segment, and no changes to the reversion to the historical loss experience method in 2023 and 2022. The reasonable and supportable forecast period for the C&I segment changed from 11 quarters to eight quarters due to model redevelopment during the third quarter of 2023. The following table provides key credit risk characteristics and macroeconomic variables that the Company uses to estimate the expected credit losses by portfolio segment: Portfolio Segment Risk Characteristics Macroeconomic Variables C&I Age percentage, size at origination, delinquency status, sector and risk rating Unemployment rate, Gross Domestic Product (“GDP”), and U.S. Treasury rates (1) 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 score, delinquency status, maturity date, collateral value, and geographic location Unemployment rate, GDP, and Home Price Indices Other consumer Loss rate approach Immaterial (2) (1) Macroeconomic variables were updated due to model redevelopment. (2) Macroeconomic variables are included in the qualitative estimate. Quantitative Component — Allowance for Loan Losses for the Commercial Loan Portfolio The Company’s C&I lifetime loss rate model estimates the loss rate expected over the life of a loan. This loss rate is applied to the amortized cost basis, excluding accrued interest receivable, 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 through the loan-level lifetime loss rate. To generate estimates of expected loss at the loan level for CRE, multifamily residential, and construction and land loans, projected PDs and LGDs are applied to the estimated exposure at default, considering the term and payment structure of the loan. The forecast of future economic conditions returns to long-run historical economic trends within the reasonable and supportable period. To estimate the life of a loan under both models, the contractual term of the loan is adjusted for estimated prepayments based on historical prepayment experience. Quantitative Component — Allowance for Loan Losses for the Consumer Loan Portfolio For single-family residential and HELOC loans, projected PDs and LGDs are applied to the estimated exposure at default, considering the term and payment structure of the loan, to generate estimates of expected loss at the loan level. The forecast of future economic conditions returns to long-run historical economic trends after the reasonable and supportable period. To estimate the life of a loan for the single-family residential and HELOC loan portfolios, the contractual term of the loan is adjusted for estimated prepayments based on historical prepayment experience. For other consumer loans, the Company uses a loss rate approach. Qualitative Component — The Company also considers the following qualitative factors in the determination of the collectively evaluated allowance if these factors have not already been captured by the quantitative model. Such qualitative factors may include, but are not limited to: – loan growth trends; – the volume and severity of past due financial assets, and the volume and severity of criticized or adversely classified financial assets; – the Company’s lending policies and procedures, including changes in lending strategies, underwriting standards, collection, write-off and recovery practices; – knowledge of a borrower’s operations; – the quality of the Company’s credit review system; – the experience, ability and depth of the Company’s management and associates; – the effect of other external factors such as the regulatory and legal environments, or changes in technology; – actual and expected changes in international, national, regional, and local economic and business conditions in which the Company operates; and – risk factors in certain industry sectors not captured by the quantitative models. The magnitude of the impact of these factors on the Company’s qualitative assessment of the allowance for credit losses changes from period to period according to changes made by management in its assessment of these factors. The extent to which these factors change may be dependent on whether they are already reflected in quantitative loss estimates during the current period and the extent to which changes in these factors diverge from period to period. 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 qualitative reserves that are designed to provide coverage for losses attributable to such risk. Allowance for Individually Evaluated Loans When a loan no longer shares similar risk characteristics with other loans, such as in the case of certain nonaccrual 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 fair value of collateral less costs to sell; (2) the present value of expected future cash flows; or (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 not to be collateral dependent, the Company uses the present value of future cash flows or the observable market value of the loan. • Collateral-Dependent Loans —
Investments in Qualified Affordable Housing Partnerships And Investments in Tax Credit and Other Investments, Net	Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net — The Company records the investments in qualified affordable housing partnerships, net, primarily 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 Company records investments in tax credit and other investments, net, using either the equity method or the measurement alternative method of accounting. The tax credits are recognized on the Consolidated Financial Statements to the extent they are utilized on the Company’s income tax returns in the year the credit arises under the flow-through method of accounting. The investments are evaluated for possible OTTI on an annual basis or on an interim basis, if an event occurs that would trigger potential impairment. OTTI charges and impairment recoveries are recorded within Amortization of tax credit and other investments on the Consolidated Statement of Income. See Note 2 — Fair Value Measurement and Fair Value of Financial Instruments to the Consolidated Financial Statements in this Form 10-K for a discussion on the Company’s impairment evaluation and monitoring process of tax credit investments.
Premises and Equipment, Net	Premises and Equipment, Net — The Company’s premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation and amortization are computed based on the straight-line method over the estimated useful lives of the various classes of assets. The ranges of estimated useful lives for the principal classes of assets are as follows: Premises and Equipment Useful Lives Buildings 25 years Furniture, fixtures and equipment, and building improvements 3 to 7 years Leasehold improvements Term of lease or useful life, whichever is shorter The Company reviews its long-lived assets for impairment annually, or when events or changes in circumstances indicate that the carrying amounts of these assets may not be recoverable. An asset is considered impaired when the fair value, which is the expected undiscounted cash flows over the remaining useful life, is less than the net book value. The excess of the net book value over its fair value is charged as impairment loss to noninterest expense.
Goodwill	Goodwill — Goodwill represents the excess of the purchase price over the fair value of net assets acquired in an acquisition. Goodwill is tested for impairment on an annual basis as of December 31, or more frequently as events occur or circumstances change that indicate a potential impairment at the reporting unit level. The Company assesses goodwill for impairment at each operating segment level. The Company organizes its operations 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 17 — Business Segments to the Consolidated Financial Statements in this Form 10-K. The Company has the option to perform a qualitative assessment of goodwill or elect to bypass the qualitative test and proceed directly to a quantitative test. If the Company performs a qualitative assessment of goodwill to test for impairment and concludes it is more likely than not that a reporting unit’s fair value is greater than its carrying value, quantitative tests are not required. If the qualitative analysis indicates that it is more likely than not that a reporting unit’s fair value is less than its carrying value, the Company is required to perform a quantitative assessment to determine if there is goodwill impairment. Factors considered in the qualitative assessments include but are not limited to macroeconomic conditions, industry and market considerations, financial performance of the respective operating segment and other reporting unit specific considerations. The Company uses a combined income and market approach in its quantitative valuation methodologies. A quantitative valuation involves determining the fair value of each reporting unit and comparing the fair value to its corresponding carrying value. Goodwill impairment loss is recorded as a charge to noninterest expense and an adjustment to the carrying value of goodwill. Subsequent reversals of goodwill impairment are not allowed.
Derivatives	Derivatives — As part of its asset/liability management strategy, the Company uses derivative financial instruments to mitigate exposure to interest rate and foreign currency risks, and to assist customers with their risk management objectives. Derivatives utilized by the Company include primarily swaps, forwards and option contracts. Derivative instruments are included in Other assets or Accrued expenses and other liabilities on the Consolidated Balance Sheet at fair value. The related cash flows are recognized on the Cash flows from operating activities section on the Consolidated Statement of Cash Flows. The Company uses its accounting hedges based on the exposure being hedged as either fair value hedges, cash flow hedges or hedges of the net investments in certain foreign operations. For fair value hedges of interest rate risk, changes in fair value of derivatives are reported within Interest expense on the Consolidated Statement of Income. Changes in fair value of derivatives designated as hedges of the net investments in foreign operations are recorded as a component of AOCI. For cash flow hedges of floating-rate interest payments or receipts, the change in the fair value of hedges is recognized in AOCI on the Consolidated Balance Sheet and reclassified to earnings in the same period when the hedged cash flows impact earnings. Reclassified gains and losses of cash flow hedges are recorded in the same line item as the hedged interest payment within Interest expense or as interest receipts within Interest and dividend income on the Consolidated Statements of Income. All derivatives designated as fair value hedges and hedges of the net investments in certain foreign operations are linked to specific hedged items or to groups of specific assets and liabilities on the Consolidated Balance Sheet. Cash flow hedges are linked to the forecasted transactions related to a recognized asset or liability. To qualify as an accounting hedge under the hedge accounting rules (versus an economic hedge where hedge accounting is not sought), a derivative must be highly effective in offsetting the risk designated as being hedged. The Company formally documents its hedging relationships at inception, including the identification of the hedging instruments and the hedged items, as well as its risk management objectives and strategies for undertaking the hedge transaction at the time the derivative contract is executed. Subsequent to inception, on a quarterly basis, the Company assesses whether the derivatives used in hedging transactions are highly effective in offsetting changes in the fair value of the hedged items or the cash flows of attributable hedged risks. The quarterly assessment is performed on both a prospective basis (to reconfirm forward-looking expectations that the hedge will be highly effective) and a retrospective basis (to determine whether the hedging relationship was highly effective). The Company discontinues hedge accounting prospectively when (i) a derivative is no longer highly effective in offsetting changes in fair value; (ii) a derivative expires, or is sold, terminated or exercised, or (iii) the Company determines that designation of a derivative as a hedge is no longer appropriate. If a fair value hedge is discontinued, the derivative will continue to be recorded on the Consolidated Balance Sheet at fair value with changes in fair value recognized on the Consolidated Statement of Income. When the hedged net investment is discontinued, any amounts that have not yet been recognized in earnings remain in AOCI until the net investment is either sold or substantially liquidated where the changes in the fair value of the derivatives are reclassified out of AOCI into Foreign exchange income on the Consolidated Statement of Income. If a cash flow hedge is discontinued but the hedged forecasted cash flow is still expected to happen, the derivative net gain or loss will remain in AOCI and be reclassified into earnings in the periods in which the hedged forecasted cash flow affects earnings. If a cash flow hedge is discontinued and when it becomes probable that the forecasted cash flow is not expected to happen, the derivative net gain or loss will be reclassified into earnings immediately. The Company also offers various interest rate, commodity and foreign exchange derivative products to customers. These transactions are not linked to specific assets or liabilities on the Consolidated Balance Sheet or to forecasted transactions in a hedging relationship and, therefore, do not qualify for hedge accounting. These contracts are recorded at fair value with changes in fair value recorded in Customer derivative income or Foreign exchange income on the Consolidated Statement of Income. As part of the Company’s loan origination process, from time to time, the Company obtains equity warrants to purchase preferred and/or common stock of public or private companies it provides loans to. Separately, the Company granted performance-based restricted stock units (“RSUs”) as part of its consideration for its investment in Rayliant Global Advisors Limited (“Rayliant”) during the third quarter of 2023. The vesting of these performance-based RSUs is contingent on Rayliant meeting certain financial performance targets during the future performance period. These equity contracts are accounted for as derivatives and recorded at fair value in Other assets or Accrued expenses and other liabilities on the Consolidated Balance Sheet with changes in fair value recorded in Lending fees or Customer derivative income on the Consolidated Statement of Income. The Company is exposed to counterparty credit risk, which is the risk that counterparties to the derivative contracts do not perform as expected. Valuation of derivative assets and liabilities reflect the value of the instrument inclusive of the nonperformance risk. The Company uses master netting arrangements to mitigate counterparty credit risk in derivative transactions. To the extent the derivatives are subject to master netting arrangements, the Company takes into account the impact of master netting arrangements that allow the Company to settle all derivative contracts executed with the same counterparty on a net basis, and to offset the net derivative position with the related cash and securities collateral. The Company elects to offset derivative transactions with the same counterparty on the Consolidated Balance Sheet when a derivative transaction has a legally enforceable master netting arrangement and when it is eligible for netting under ASC 210-20-45-1, Balance Sheet Offsetting: Netting Derivative Positions on Balance Sheet. Derivative balances and related cash collateral are presented net on the Consolidated Balance Sheet. In addition, the Company applies the Settlement to Market treatment for the cash collateralizing our interest rate and commodity contracts with certain centrally cleared counterparties. As a result, derivative balances with these counterparties are considered settled by the collateral.
Fair Value	Fair Value — The Company records or discloses certain assets and liabilities at fair value. 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. Fair value measurements are based on the exit price notion that maximizes the use of observable inputs and minimizes the use of unobservable inputs. All inputs, whether observable or unobservable, are ranked in accordance with a prescribed fair value hierarchy that assigns the highest priority to quoted prices in active markets and the lowest priority to prices derived from data lacking transparency. 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. 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. For additional information on fair value, see Note 2 — Fair Value Measurement and Fair Value of Financial Instruments to the Consolidated Financial Statements in this Form 10-K.
Stock-Based Compensation	Stock-Based Compensation — The Company grants time-based RSUs, which include service conditions for vesting. Compensation cost for these time-based awards is based on the quoted market price of the Company’s common stock at the grant date. Compensation costs for time-based RSUs that will be settled in cash instead of shares are adjusted to fair value based on changes in the Company’s stock price up to the settlement date. In addition, the Company grants performance-based RSUs, which contain additional performance goals and market conditions that are required to be met in order for the awards to vest. Compensation expense for these performance-based RSUs is based on the grant-date fair value considers both performance and market conditions. Subsequently, the Company evaluates the probable outcome of the performance conditions quarterly and makes cumulative adjustments for current and prior periods in compensation expense in the period of change. Market conditions subsequent to the grant date have no impact on the amount of compensation expense the Company will recognize over the life of the award. Compensation cost is amortized on a straight-line basis over the requisite service period for the entire award, which is generally the maximum vesting period of the award. Excess tax benefits and deficiencies on share-based payment awards are recognized within Income tax expense on the Consolidated Statement of Income. As stock-based compensation expense is estimated based on awards ultimately expected to vest, it is reduced by the expense related to awards expected to be forfeited. Forfeitures are estimated at the time of grant and are updated quarterly. If the estimated forfeitures are revised, a cumulative effect of changes in estimated forfeitures for the current and prior periods is recognized in compensation expense in the period of change. Refer to Note 13 — Stock Compensation Plans on the Consolidated Financial Statements in this Form 10-K for additional information. Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Stock-Based Compensation to the Consolidated Financial Statements in this Form 10-K.
Revenue from Contracts with Customers	Revenue from Contracts with Customers — The Company recognizes two primary types of revenue on its Consolidated Statement of Income: Net interest income and Noninterest income . The Company’s revenue from contracts with customers consists of service charges and fees related to deposit accounts, card income and wealth management fees. These revenue streams as described below comprised 40%, 39% and 35% of total noninterest income for the years ended December 31, 2023, 2022 and 2021, respectively. • 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 various in-branch services, automated teller machine/debit card 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 transaction 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 service charge and related fee income are recognized in all operating segments. • Card Income — Card income consists 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. Card income is recognized in consumer and business banking, and commercial banking segments. • 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 with whom the Company engages. Wealth management fees are recognized in both consumer and business banking, and commercial banking segments.
Income Taxes	Income Taxes — The Company files consolidated federal income tax returns, foreign tax returns, and various combined and separate company state tax returns. The calculation of the Company’s income tax provision and related tax accruals requires the use of estimates and judgments. Income tax expense consists of two components: current and deferred. Current tax expense represents taxes to be paid or refunded for the current period and includes income tax expense related to our uncertain tax positions. Income tax liabilities (receivables) represent the estimated amounts due to (due from) the various taxing jurisdictions where the Company has established a tax presence and are reported in Accrued expenses and other liabilities or Other assets on the Consolidated Balance Sheets. Deferred tax expense results from changes in deferred tax assets and liabilities between period, and is determined using the balance sheet method. Under the balance sheet method, the net deferred tax asset or liability is based on the tax effects of the differences between the book and tax basis of assets and liabilities. Deferred tax assets are also recognized for tax attributes such as net operating loss carryforwards and tax credit carryforwards. Management regularly reviews the Company’s tax positions and deferred tax balances. In concluding whether a valuation allowance is required, the Company considers all available evidence, both positive and negative, based on the more-likely-than-not criteria that such assets will be realized. Factors considered in this analysis include the Company’s ability to generate future taxable income, implement tax-planning strategies (as defined in ASC 740, Income Taxes ) and utilize taxable income from prior carryback years (if such carryback is permitted under the applicable tax law), as well as future reversals of existing taxable temporary differences. To the extent a deferred tax asset is no longer expected more-likely-than-not to be realized, a valuation allowance is established. Deferred tax assets net of deferred tax liabilities are included in Other assets on the Consolidated Balance Sheet. The Company reports a liability for unrecognized tax benefits resulting from uncertain tax positions taken, or expected to be taken, in an income tax return. Uncertain tax positions that meet the more-likely-than-not recognition threshold are measured to determine the amount of benefit to recognize. An uncertain tax position is measured at the largest amount of benefit that management believes has a greater than 50% likelihood of realization upon settlement. Tax benefits not meeting our realization criteria represent unrecognized tax benefits. The Company establishes a liability for potential taxes, interest and penalties related to uncertain tax positions based on facts and circumstances, including the interpretation of existing law, new judicial or regulatory guidance, and the status of tax audits.
Earnings Per Share	Earnings Per Share — Basic EPS is computed by dividing net income by the weighted-average number of common shares outstanding during each period. Diluted EPS is computed by taking net income, adjusted to remove any fair value changes related to liability-classified contingent equity contracts, divided by the weighted-average number of common shares outstanding during each period, plus any incremental dilutive common share equivalents calculated for outstanding time- and performance-based RSUs and contingently issuable shares using the treasury stock method.
Foreign Currency Translation	Foreign Currency Translation — The Company’s foreign subsidiary in China, East West Bank (China) Limited’s functional currency is in Chinese Renminbi (“RMB”). As a result, assets and liabilities of East West Bank (China) Limited are translated, for the consolidation purpose, from its functional currency into the reporting currency U.S. dollar (“USD”) using period-end spot foreign exchange rates. Revenues and expenses of East West Bank (China) Limited are translated, for the purpose of consolidation, from its functional currency into USD at the transaction date foreign exchange rates. The effects of those translation adjustments are reported in the Foreign currency translation adjustments account within Other comprehensive income (loss) on the Consolidated Statement of Comprehensive Income, net of any related hedged effects. For transactions that are denominated in a currency other than the functional currency, including transactions denominated in the local currencies of foreign operations that use the USD as their functional currency, the effects of changes in exchange rates are reported in Foreign exchange income on the Consolidated Statement of Income.
Accounting Pronouncements	Accounting Pronouncements Adopted in 2023 Standard Required Date of Adoption Description Effect on Financial Statements ASU 2022-02, Financial Instruments — Credit Losses (Topic 326): Troubled Debt Restructurings and the Vintage Disclosures Effective for fiscal years beginning after December 15, 2022. ASU 2022-02 eliminates the • accounting guidance for TDR, and requires the Company to apply the loan refinancing and restructuring guidance to determine whether a modification made to a loan results in a new loan or a continuation of an existing loan; and • requirement to use a discounted cash flow method to measure receivables. The guidance also requires • enhanced disclosures for certain loan refinancing and restructurings by creditors when the borrower is experiencing financial difficulty; and • vintage disclosures of current period gross charge-offs (on a current year-to-date basis) by year of loan origination for financing receivables and net investments in leases within the scope of ASC 326-20: Financial Instruments — Credit Losses — Measured at Amortized Cost . The Company adopted ASU 2022-02 on January 1, 2023 on a prospective basis, except for the guidance related to the elimination of TDR recognition and measurement, which was adopted on a modified retrospective approach. This adoption increased the allowance for loan losses on TDRs as of December 31, 2022 by $6 million and decreased opening retained earnings on January 1, 2023 by $4 million after-tax. The following standards were adopted on January 1, 2023, but they did not have a material impact on the Company’s Consolidated Financial Statements: • ASU 2021-08, Business Combinations (Topic 805) : Accounting for Contract Assets and Contract Liabilities from Contracts with Customers • ASU 2022-01, Derivatives and Hedging (Topic 815) : Fair Value Hedging — Portfolio Layer Method • ASU 2022-04, Liabilities — Supplier Finance Program (Subtopic 405-50) : Disclosures of Supplier Finance Program Obligations Accounting Pronouncements Adopted in 2024 Standard Required Date of Adoption Description Effect on Financial Statements ASU 2023-02, Investments — Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method January 1, 2024 ASU 2023-02 expands the scope of the proportional amortization method to equity tax credit investment programs if certain conditions are met. Previously, the proportional amortization method could only be used for investments in low-income housing tax credit structures. Under this guidance, companies are able to elect, on a tax credit program-by-tax credit program basis, to apply the proportional amortization method to all equity investments meeting the criteria in ASC 323-740-25-1. The amendments in this guidance must be applied on a modified retrospective or a retrospective basis. The Company adopted ASU 2023-02 on January 1, 2024, for all tax credit investments under a modified retrospective basis. The impact of the adoption decreased opening retained earnings on January 1, 2024 by $10 million. The following standards were adopted on January 1, 2024, but they did not have a material impact on the Company’s Consolidated Financial Statements: • ASU 2023-01, Leases (Topic 842): Common Control Arrangements • ASU 2022-03, Fair Value Measurement (Topic 820) Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions Recent Accounting Pronouncements Yet to be Adopted Standard Required Date of Adoption Description Effect on Financial Statements ASU No. 2023-07, Segment Reporting (Topic 280) : Improvements to Reportable Segment Disclosures December 31, 2024. Early adoption is permitted ASU 2023-07 expands the disclosure requirements for reportable segments of public entities by adding the following disclosure requirements: • Requires, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit or loss. • Requires , on an annual and interim basis, amount and composition of other segment items. This amount reconciles segment revenues, less the significant segment expenses, to the reported measure of segment profit or loss. • Expands the current interim disclosure requirements to require all existing annual disclosures about a reportable segment’s profit or loss and assets also be made on an interim basis. • Clarifies that if a CODM uses more than one measure of segment profit or loss, then the entity may disclose one or more measures, but at least one measure should be that which is most consistent with GAAP measurement principles. • Requires annual disclosure of the title and position of the CODM as well as explanation of how the CODM uses the reported measures in assessing segment performance and allocating resources. The Company is currently evaluating the impact of this guidance on the Company’s Consolidated Financial Statements. ASU No. 2023-09, Income Taxes (Topic 740) : Improvements to Income Tax Disclosures December 31, 2025 Early adoption is permitted. ASU 2023-09 amends the disclosure requirements for income taxes, including the requirement for further disaggregation of the income tax rate reconciliation and income taxes paid disclosures. The amendments in this guidance must be applied prospectively, with the option to apply retrospectively. The Company is currently evaluating the impact of this guidance on the Company’s Consolidated Financial Statements. The following standard will be adopted on January 1, 2025 and is not expected to have a material impact on the Company’s Consolidated Financial Statements: • ASU 2023-05, Business Combinations — Joint Venture Formations (Subtopic 805-60):
Balance Sheet Offsetting	The Company’s resale and repurchase agreements are transacted under legally enforceable master netting agreements that, in the event of default by the counterparty, provide the Company 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
Credit Quality Indicators	Credit Quality Indicators All loans are subject to the Company’s credit review and monitoring process. For the commercial loan 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 consumer loan portfolio, payment performance or delinquency is typically the driving indicator for risk ratings. The Company utilizes internal credit risk ratings to assign each individual loan a risk rating of 1 through 10: • Pass — loans risk rated 1 through 5 are assigned an internal risk rating category of “Pass.” Loans risk rated 1 are typically loans fully secured by cash. Pass loans have sufficient sources of repayment to repay the loan in full, in accordance with all terms and conditions. • Special mention — loans assigned a risk rating of 6 have potential weaknesses that warrant closer attention by management; these are assigned an internal risk rating category of “Special Mention.” • Substandard — 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 category of “Substandard.” • Doubtful — 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 category of “Doubtful.” • Loss — loans assigned a risk rating of 10 are uncollectible and of such little value that they are no longer considered bankable assets; these are assigned an internal risk rating category of “Loss.” Loan exposures categorized as criticized consist of special mention, substandard, doubtful and loss categories. The Company reviews the internal risk ratings of its loan portfolio on a regular basis, and adjusts the ratings based on changes in the borrowers’ financial status and the collectability of the loans.
Variable Interest	Variable Interest Entities The majority of both the investments in affordable housing partnerships and tax credit and other investments discussed above are variable interest entities where the Company is a limited partner in these partnerships, and an unrelated third party is typically the general partner or managing member who has control over the significant activities of these 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 investments due to the general partner’s or managing member’s ability to manage the entity, which is indicative of the general partner’s or managing member’s power over the entity. The Company’s maximum exposure to loss in connection with these partnerships consists of the unamortized investment balance and any tax credits claimed that may become subject to recapture.
Litigation	Litigation — The Company is a party to various legal actions arising in the ordinary 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.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Schedule of Useful Lives for Premises and Equipment	The ranges of estimated useful lives for the principal classes of assets are as follows: Premises and Equipment Useful Lives Buildings 25 years Furniture, fixtures and equipment, and building improvements 3 to 7 years Leasehold improvements Term of lease or useful life, whichever is shorter
Schedule of New Accounting Pronouncements Adopted and Recent Accounting Pronouncements	Accounting Pronouncements Adopted in 2023 Standard Required Date of Adoption Description Effect on Financial Statements ASU 2022-02, Financial Instruments — Credit Losses (Topic 326): Troubled Debt Restructurings and the Vintage Disclosures Effective for fiscal years beginning after December 15, 2022. ASU 2022-02 eliminates the • accounting guidance for TDR, and requires the Company to apply the loan refinancing and restructuring guidance to determine whether a modification made to a loan results in a new loan or a continuation of an existing loan; and • requirement to use a discounted cash flow method to measure receivables. The guidance also requires • enhanced disclosures for certain loan refinancing and restructurings by creditors when the borrower is experiencing financial difficulty; and • vintage disclosures of current period gross charge-offs (on a current year-to-date basis) by year of loan origination for financing receivables and net investments in leases within the scope of ASC 326-20: Financial Instruments — Credit Losses — Measured at Amortized Cost . The Company adopted ASU 2022-02 on January 1, 2023 on a prospective basis, except for the guidance related to the elimination of TDR recognition and measurement, which was adopted on a modified retrospective approach. This adoption increased the allowance for loan losses on TDRs as of December 31, 2022 by $6 million and decreased opening retained earnings on January 1, 2023 by $4 million after-tax. The following standards were adopted on January 1, 2023, but they did not have a material impact on the Company’s Consolidated Financial Statements: • ASU 2021-08, Business Combinations (Topic 805) : Accounting for Contract Assets and Contract Liabilities from Contracts with Customers • ASU 2022-01, Derivatives and Hedging (Topic 815) : Fair Value Hedging — Portfolio Layer Method • ASU 2022-04, Liabilities — Supplier Finance Program (Subtopic 405-50) : Disclosures of Supplier Finance Program Obligations Accounting Pronouncements Adopted in 2024 Standard Required Date of Adoption Description Effect on Financial Statements ASU 2023-02, Investments — Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method January 1, 2024 ASU 2023-02 expands the scope of the proportional amortization method to equity tax credit investment programs if certain conditions are met. Previously, the proportional amortization method could only be used for investments in low-income housing tax credit structures. Under this guidance, companies are able to elect, on a tax credit program-by-tax credit program basis, to apply the proportional amortization method to all equity investments meeting the criteria in ASC 323-740-25-1. The amendments in this guidance must be applied on a modified retrospective or a retrospective basis. The Company adopted ASU 2023-02 on January 1, 2024, for all tax credit investments under a modified retrospective basis. The impact of the adoption decreased opening retained earnings on January 1, 2024 by $10 million. The following standards were adopted on January 1, 2024, but they did not have a material impact on the Company’s Consolidated Financial Statements: • ASU 2023-01, Leases (Topic 842): Common Control Arrangements • ASU 2022-03, Fair Value Measurement (Topic 820) Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions Recent Accounting Pronouncements Yet to be Adopted Standard Required Date of Adoption Description Effect on Financial Statements ASU No. 2023-07, Segment Reporting (Topic 280) : Improvements to Reportable Segment Disclosures December 31, 2024. Early adoption is permitted ASU 2023-07 expands the disclosure requirements for reportable segments of public entities by adding the following disclosure requirements: • Requires, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit or loss. • Requires , on an annual and interim basis, amount and composition of other segment items. This amount reconciles segment revenues, less the significant segment expenses, to the reported measure of segment profit or loss. • Expands the current interim disclosure requirements to require all existing annual disclosures about a reportable segment’s profit or loss and assets also be made on an interim basis. • Clarifies that if a CODM uses more than one measure of segment profit or loss, then the entity may disclose one or more measures, but at least one measure should be that which is most consistent with GAAP measurement principles. • Requires annual disclosure of the title and position of the CODM as well as explanation of how the CODM uses the reported measures in assessing segment performance and allocating resources. The Company is currently evaluating the impact of this guidance on the Company’s Consolidated Financial Statements. ASU No. 2023-09, Income Taxes (Topic 740) : Improvements to Income Tax Disclosures December 31, 2025 Early adoption is permitted. ASU 2023-09 amends the disclosure requirements for income taxes, including the requirement for further disaggregation of the income tax rate reconciliation and income taxes paid disclosures. The amendments in this guidance must be applied prospectively, with the option to apply retrospectively. The Company is currently evaluating the impact of this guidance on the Company’s Consolidated Financial Statements. The following standard will be adopted on January 1, 2025 and is not expected to have a material impact on the Company’s Consolidated Financial Statements: • ASU 2023-05, Business Combinations — Joint Venture Formations (Subtopic 805-60):

Fair Value Measurement and Fa_2

Fair Value Measurement and Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of Increase (Decrease) in Fair Value of Assets for which a Nonrecurring Fair Value Adjustment Has Been Recognized	The following table presents the increase (decrease) in the fair value of certain assets held at the end of the respective reporting periods, for which a nonrecurring fair value adjustment was recognized for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Loans held-for-investment: Commercial: C&I $ (6,152) $ (25,996) $ (9,580) CRE: CRE (1,183) (7,098) (10,231) Total commercial (7,335) (33,094) (19,811) Consumer: Residential mortgage: HELOCs (40) 166 (4) Total consumer $ (40) $ 166 $ (4) Total loans held-for-investment $ (7,375) $ (32,928) $ (19,815) Investments in qualified affordable housing partnerships, tax credit and other investments, net $ (1,140) $ 469 $ 877 Other nonperforming assets $ — $ (6,861) $ (4,241)
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 December 31, 2023 and 2022, 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, restricted equity securities, at cost, and mortgage servicing rights that are included in Other assets , and accrued interest payable which is included in Accrued expenses and other liabilities . These financial instruments are measured on an amortized cost basis on the Company’s Consolidated Balance Sheet. December 31, 2023 ($ in thousands) Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value Financial assets: Cash and cash equivalents $ 4,614,984 $ 4,614,984 $ — $ — $ 4,614,984 Interest-bearing deposits with banks $ 10,498 $ — $ 10,498 $ — $ 10,498 Resale agreements $ 785,000 $ — $ 699,056 $ — $ 699,056 HTM debt securities $ 2,956,040 $ 488,551 $ 1,965,420 $ — $ 2,453,971 Restricted equity securities, at cost $ 79,811 $ — $ 79,811 $ — $ 79,811 Loans held-for-sale $ 116 $ — $ 116 $ — $ 116 Loans held-for-investment, net $ 51,542,039 $ — $ — $ 50,256,565 $ 50,256,565 Mortgage servicing rights $ 6,602 $ — $ — $ 9,470 $ 9,470 Accrued interest receivable $ 331,490 $ — $ 331,490 $ — $ 331,490 Financial liabilities: Demand, checking, savings and money market deposits $ 38,048,974 $ — $ 38,048,974 $ — $ 38,048,974 Time deposits $ 18,043,464 $ — $ 18,004,951 $ — $ 18,004,951 Short-term borrowings $ 4,500,000 $ — $ 4,500,000 $ — $ 4,500,000 Long-term debt $ 148,249 $ — $ 150,896 $ — $ 150,896 Accrued interest payable $ 205,430 $ — $ 205,430 $ — $ 205,430 December 31, 2022 ($ in thousands) Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value Financial assets: Cash and cash equivalents $ 3,481,784 $ 3,481,784 $ — $ — $ 3,481,784 Interest-bearing deposits with banks $ 139,021 $ — $ 139,021 $ — $ 139,021 Resale agreements $ 792,192 $ — $ 693,656 $ — $ 693,656 HTM debt securities $ 3,001,868 $ 471,469 $ 1,983,702 $ — $ 2,455,171 Restricted equity securities, at cost $ 78,624 $ — $ 78,624 $ — $ 78,624 Loans held-for-sale $ 25,644 $ — $ 25,644 $ — $ 25,644 Loans held-for-investment, net $ 47,606,785 $ — $ — $ 46,670,690 $ 46,670,690 Mortgage servicing rights $ 6,235 $ — $ — $ 10,917 $ 10,917 Accrued interest receivable $ 263,430 $ — $ 263,430 $ — $ 263,430 Financial liabilities: Demand, checking, savings and money market deposits $ 42,637,316 $ — $ 42,637,316 $ — $ 42,637,316 Time deposits $ 13,330,533 $ — $ 13,228,777 $ — $ 13,228,777 Repurchase agreements $ 300,000 $ — $ 304,097 $ — $ 304,097 Long-term debt $ 147,950 $ — $ 143,483 $ — $ 143,483 Accrued interest payable $ 37,198 $ — $ 37,198 $ — $ 37,198
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 December 31, 2023 and 2022: Assets and Liabilities Measured at Fair Value on a Recurring Basis ($ in thousands) Level 1 Level 2 Level 3 Total Fair Value AFS debt securities: U.S. Treasury securities $ 1,060,375 $ — $ — $ 1,060,375 U.S. government agency and U.S. government sponsored enterprise debt securities — 364,446 — 364,446 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities — 468,259 — 468,259 Residential mortgage-backed securities — 1,727,594 — 1,727,594 Municipal securities — 261,016 — 261,016 Non-agency mortgage-backed securities: Commercial mortgage-backed securities — 367,516 — 367,516 Residential mortgage-backed securities — 553,671 — 553,671 Corporate debt securities — 502,425 — 502,425 Foreign government bonds — 227,874 — 227,874 Asset-backed securities — 42,300 — 42,300 Collateralized loan obligations (“CLOs”) — 612,861 — 612,861 Total AFS debt securities $ 1,060,375 $ 5,127,962 $ — $ 6,188,337 Investments in qualified affordable housing partnerships, tax credit and other investments, net: Equity securities $ 20,509 $ 4,150 $ — $ 24,659 Total investments in qualified affordable housing partnerships, tax credit and other investments, net $ 20,509 $ 4,150 $ — $ 24,659 Derivative assets: Interest rate contracts $ — $ 473,907 $ — $ 473,907 Foreign exchange contracts — 57,072 — 57,072 Credit contracts — 1 — 1 Equity contracts — — 336 336 Commodity contracts — 79,604 — 79,604 Gross derivative assets $ — $ 610,584 $ 336 $ 610,920 Netting adjustments (1) $ — $ (312,792) $ — $ (312,792) Net derivative assets $ — $ 297,792 $ 336 $ 298,128 Derivative liabilities: Interest rate contracts $ — $ 433,936 $ — $ 433,936 Foreign exchange contracts — 42,564 — 42,564 Equity contracts (2) — — 15,119 15,119 Credit contracts — 25 — 25 Commodity contracts — 121,670 — 121,670 Gross derivative liabilities $ — $ 598,195 $ 15,119 $ 613,314 Netting adjustments (1) $ — $ (76,170) $ — $ (76,170) Net derivative liabilities $ — $ 522,025 $ 15,119 $ 537,144 Assets and Liabilities Measured at Fair Value on a Recurring Basis ($ in thousands) Level 1 Level 2 Level 3 Total Fair Value AFS debt securities: U.S. Treasury securities $ 606,203 $ — $ — $ 606,203 U.S. government agency and U.S. government sponsored enterprise debt securities — 461,607 — 461,607 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities — 500,269 — 500,269 Residential mortgage-backed securities — 1,762,195 — 1,762,195 Municipal securities — 257,099 — 257,099 Non-agency mortgage-backed securities: Commercial mortgage-backed securities — 398,329 — 398,329 Residential mortgage-backed securities — 649,224 — 649,224 Corporate debt securities — 526,274 — 526,274 Foreign government bonds — 227,053 — 227,053 Asset-backed securities — 49,076 — 49,076 CLOs — 597,664 — 597,664 Total AFS debt securities $ 606,203 $ 5,428,790 $ — $ 6,034,993 Investments in qualified affordable housing partnerships, tax credit and other investments, net: Equity securities $ 19,777 $ 4,177 $ — $ 23,954 Total investments in qualified affordable housing partnerships, tax credit and other investments, net $ 19,777 $ 4,177 $ — $ 23,954 Derivative assets: Interest rate contracts $ — $ 440,283 $ — $ 440,283 Foreign exchange contracts — 53,109 — 53,109 Equity contracts — — 323 323 Commodity contracts — 261,613 — 261,613 Gross derivative assets $ — $ 755,005 $ 323 $ 755,328 Netting adjustments (1) $ — $ (614,783) $ — $ (614,783) Net derivative assets $ — $ 140,222 $ 323 $ 140,545 Derivative liabilities: Interest rate contracts $ — $ 584,516 $ — $ 584,516 Foreign exchange contracts — 44,117 — 44,117 Credit contracts — 23 — 23 Commodity contracts — 258,608 — 258,608 Gross derivative liabilities $ — $ 887,264 $ — $ 887,264 Netting adjustments (1) $ — $ (242,745) $ — $ (242,745) Net derivative liabilities $ — $ 644,519 $ — $ 644,519 (1) Represents balance sheet netting of derivative assets and liabilities and related cash collateral under master netting agreements or similar agreements. See Note 5 — Derivatives to the Consolidated Financial Statements in this Form 10-K for additional information. (2) Equity contracts classified as derivative liabilities consist of performance-based RSUs granted as part of EWBC’s consideration in its investment in Rayliant.
Reconciliation of the Beginning and Ending Balances of Equity Contracts 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 contracts for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Derivative assets: Equity contracts Beginning balance $ 323 $ 215 $ 273 Total (losses) gains included in earnings (1) (79) 17 32 Issuances 92 91 12 Settlements — — (96) Transfers out of Level 3 (2) — — (6) Ending balance $ 336 $ 323 $ 215 Derivative liabilities: Equity contracts (3) Beginning balance $ — $ — $ — Issuances 15,119 — — Ending balance $ 15,119 $ — $ — (1) Includes both realized and unrealized (losses) gains recorded in Lending fees on the Consolidated Statement of Income. The unrealized (losses) gains were $(79) thousand, $17 thousand, and $(44) thousand for the years ended December 31, 2023, 2022 and 2021, respectively. (2) During the year ending December 31, 2021, the Company transferred $6 thousand of equity contracts measured on a recurring basis out of Level 3 to Level 2 after the corresponding issuer of the equity warrant, which was previously a private company, completed its initial public offering and became a public company. (3) Equity contracts classified as derivative liabilities consist of performance-based RSUs granted as part of EWBC’s consideration in its investment in Rayliant.
Schedule of Quantitative Information About Significant Unobservable Inputs Used in the Valuation of level 3 Fair Value Measurements	The following table presents quantitative information about the significant unobservable inputs used in the valuation of Level 3 fair value measurements as of December 31, 2023 and 2022. The significant unobservable inputs presented in the table below are those that the Company considers significant to the fair value of the Level 3 assets. The Company considers unobservable inputs to be significant if, by their exclusion, the fair value of the Level 3 assets would be impacted by a predetermined percentage change. ($ in thousands) Fair Value Measurements (Level 3) Valuation Technique Unobservable Inputs Range of Inputs Weighted- Average of Inputs December 31, 2023 Derivative assets: Equity contracts $ 336 Black-Scholes option pricing model Equity volatility 37% — 48% 45% (1) Liquidity discount 47% 47% Derivative liabilities: Equity contracts (2) $ 15,119 Internal model Payout % designated based on operating revenue and operating EBITDA of investee 84% 84% December 31, 2022 Derivative assets: Equity contracts $ 323 Black-Scholes option pricing model Equity volatility 42% — 60% 54% (1) Liquidity discount 47% 47% (1) Weighted-average of inputs is calculated based on the fair value of equity contracts as of December 31, 2023 and 2022. (2) Equity contracts classified as derivative liabilities consist of performance-based RSUs granted as part of EWBC’s consideration in its investment in Rayliant. 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 December 31, 2023 and 2022: ($ in thousands) Fair Value Measurements (Level 3) Valuation Techniques Unobservable Inputs Range of Inputs Weighted-Average of Inputs December 31, 2023 Loans held-for-investment $ 16,328 Fair value of collateral Discount 15% — 75% 45% (1) $ 3,009 Fair value of collateral Contract value NM NM $ 26,555 Fair value of property Selling cost 8% 8% Investments in qualified affordable housing partnerships, tax credit and other investments, net $ 868 Individual analysis of each investment Expected future tax NM NM December 31, 2022 Loans held-for-investment $ 23,322 Discounted cash flows Discount 4% — 6% 4% (1) $ 17,912 Fair value of collateral Discount 15% — 75% 37% (1) $ 31,380 Fair value of property Selling cost 8% 8% NM - Not meaningful (1) Weighted-average of inputs is based on the relative fair value of the respective assets as of December 31, 2023 and 2022.
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 adjustments measured on a nonrecurring basis as of December 31, 2023 and 2022: Assets Measured at Fair Value on a Nonrecurring Basis ($ in thousands) Level 1 Level 2 Level 3 Fair Value Measurements Loans held-for-investment: Commercial: C&I $ — $ — $ 22,035 $ 22,035 CRE: CRE — — 22,653 22,653 Total commercial — — 44,688 44,688 Consumer: Residential mortgage: HELOCs — — 1,204 1,204 Total consumer — — 1,204 1,204 Total loans held-for-investment $ — $ — $ 45,892 $ 45,892 Investments in qualified affordable housing partnerships, tax credit and other investments, net $ — $ — $ 868 $ 868 Assets Measured at Fair Value on a Nonrecurring Basis ($ in thousands) Level 1 Level 2 Level 3 Fair Value Measurements Loans held-for-investment: Commercial: C&I $ — $ — $ 40,011 $ 40,011 CRE: CRE — — 31,380 31,380 Total commercial — — 71,391 71,391 Consumer: Residential mortgage: HELOCs — — 1,223 1,223 Total consumer — — 1,223 1,223 Total loans held-for-investment $ — $ — $ 72,614 $ 72,614

Assets Purchased under Resale_2

Assets Purchased under Resale Agreements and Sold under Repurchase Agreements (Tables)	12 Months Ended
	Dec. 31, 2023
RESALE AND REPURCHASE AGREEMENTS
Schedule of Balance Sheet Offsetting for Resale Agreements and Repurchase Agreements	The following tables present the resale and repurchase agreements included on the Consolidated Balance Sheet as of December 31, 2023 and 2022: ($ in thousands) December 31, 2023 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 Collateral Received Net Amount Resale agreements $ 785,000 $ — $ 785,000 $ (715,358) (1) $ 69,642 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 Collateral Pledged Net Amount Repurchase agreements $ — $ — $ — $ — $ — ($ in thousands) December 31, 2022 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 Collateral Received Net Amount Resale agreements $ 792,192 $ — $ 792,192 $ (701,790) (1) $ 90,402 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 Collateral Pledged Net Amount Repurchase agreements $ 300,000 $ — $ 300,000 $ (300,000) (2) $ — (1) Represents the fair value of assets 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 assets 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.

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Schedule of Debt Securities, Available-for-Sale	The following tables present the amortized cost, gross unrealized gains and losses, and fair value by major categories of AFS and HTM debt securities as of December 31, 2023 and 2022: December 31, 2023 ($ in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value AFS debt securities: U.S. Treasury securities $ 1,112,587 $ 101 $ (52,313) $ 1,060,375 U.S. government agency and U.S. government-sponsored enterprise debt securities 412,086 — (47,640) 364,446 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 531,377 158 (63,276) 468,259 Residential mortgage-backed securities 1,956,927 380 (229,713) 1,727,594 Municipal securities: 297,283 75 (36,342) 261,016 Non-agency mortgage-backed securities: Commercial mortgage-backed securities 409,578 — (42,062) 367,516 Residential mortgage-backed securities 643,335 — (89,664) 553,671 Corporate debt securities 653,501 — (151,076) 502,425 Foreign government bonds 239,333 69 (11,528) 227,874 Asset-backed securities 43,234 — (934) 42,300 CLOs 617,250 — (4,389) 612,861 Total AFS debt securities 6,916,491 783 (728,937) 6,188,337 HTM debt securities U.S. Treasury securities 529,548 — (40,997) 488,551 U.S. government agency and U.S. government-sponsored enterprise debt securities 1,001,836 — (186,904) 814,932 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 493,348 — (88,968) 404,380 Residential mortgage-backed securities 742,436 — (142,119) 600,317 Municipal securities 188,872 — (43,081) 145,791 Total HTM debt securities 2,956,040 — (502,069) 2,453,971 Total debt securities $ 9,872,531 $ 783 $ (1,231,006) $ 8,642,308 December 31, 2022 ($ in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value AFS debt securities: U.S. Treasury securities $ 676,306 $ — $ (70,103) $ 606,203 U.S. government agency and U.S. government-sponsored enterprise debt securities 517,806 67 (56,266) 461,607 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 577,392 — (77,123) 500,269 Residential mortgage-backed securities 2,011,054 41 (248,900) 1,762,195 Municipal securities 303,884 3 (46,788) 257,099 Non-agency mortgage-backed securities: Commercial mortgage-backed securities 447,512 213 (49,396) 398,329 Residential mortgage-backed securities 762,202 — (112,978) 649,224 Corporate debt securities 673,502 — (147,228) 526,274 Foreign government bonds 241,165 174 (14,286) 227,053 Asset-backed securities 51,152 — (2,076) 49,076 CLOs 617,250 — (19,586) 597,664 Total AFS debt securities 6,879,225 498 (844,730) 6,034,993 HTM debt securities: U.S. Treasury securities 524,081 — (52,612) 471,469 U.S. government agency and U.S. government-sponsored enterprise debt securities 998,972 — (209,560) 789,412 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 506,965 — (98,566) 408,399 Residential mortgage-backed securities 782,141 — (148,230) 633,911 Municipal securities 189,709 — (37,729) 151,980 Total HTM debt securities 3,001,868 — (546,697) 2,455,171 Total debt securities $ 9,881,093 $ 498 $ (1,391,427) $ 8,490,164
Schedule of Debt Securities, Held-to-Maturity	The following tables present the amortized cost, gross unrealized gains and losses, and fair value by major categories of AFS and HTM debt securities as of December 31, 2023 and 2022: December 31, 2023 ($ in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value AFS debt securities: U.S. Treasury securities $ 1,112,587 $ 101 $ (52,313) $ 1,060,375 U.S. government agency and U.S. government-sponsored enterprise debt securities 412,086 — (47,640) 364,446 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 531,377 158 (63,276) 468,259 Residential mortgage-backed securities 1,956,927 380 (229,713) 1,727,594 Municipal securities: 297,283 75 (36,342) 261,016 Non-agency mortgage-backed securities: Commercial mortgage-backed securities 409,578 — (42,062) 367,516 Residential mortgage-backed securities 643,335 — (89,664) 553,671 Corporate debt securities 653,501 — (151,076) 502,425 Foreign government bonds 239,333 69 (11,528) 227,874 Asset-backed securities 43,234 — (934) 42,300 CLOs 617,250 — (4,389) 612,861 Total AFS debt securities 6,916,491 783 (728,937) 6,188,337 HTM debt securities U.S. Treasury securities 529,548 — (40,997) 488,551 U.S. government agency and U.S. government-sponsored enterprise debt securities 1,001,836 — (186,904) 814,932 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 493,348 — (88,968) 404,380 Residential mortgage-backed securities 742,436 — (142,119) 600,317 Municipal securities 188,872 — (43,081) 145,791 Total HTM debt securities 2,956,040 — (502,069) 2,453,971 Total debt securities $ 9,872,531 $ 783 $ (1,231,006) $ 8,642,308 December 31, 2022 ($ in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value AFS debt securities: U.S. Treasury securities $ 676,306 $ — $ (70,103) $ 606,203 U.S. government agency and U.S. government-sponsored enterprise debt securities 517,806 67 (56,266) 461,607 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 577,392 — (77,123) 500,269 Residential mortgage-backed securities 2,011,054 41 (248,900) 1,762,195 Municipal securities 303,884 3 (46,788) 257,099 Non-agency mortgage-backed securities: Commercial mortgage-backed securities 447,512 213 (49,396) 398,329 Residential mortgage-backed securities 762,202 — (112,978) 649,224 Corporate debt securities 673,502 — (147,228) 526,274 Foreign government bonds 241,165 174 (14,286) 227,053 Asset-backed securities 51,152 — (2,076) 49,076 CLOs 617,250 — (19,586) 597,664 Total AFS debt securities 6,879,225 498 (844,730) 6,034,993 HTM debt securities: U.S. Treasury securities 524,081 — (52,612) 471,469 U.S. government agency and U.S. government-sponsored enterprise debt securities 998,972 — (209,560) 789,412 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 506,965 — (98,566) 408,399 Residential mortgage-backed securities 782,141 — (148,230) 633,911 Municipal securities 189,709 — (37,729) 151,980 Total HTM debt securities 3,001,868 — (546,697) 2,455,171 Total debt securities $ 9,881,093 $ 498 $ (1,391,427) $ 8,490,164
Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value	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 December 31, 2023 and 2022: December 31, 2023 Less Than 12 Months 12 Months or More Total ($ in thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses AFS debt securities: U.S. Treasury securities $ — $ — $ 623,978 $ (52,313) $ 623,978 $ (52,313) U.S. government agency and U.S. government-sponsored enterprise debt securities — — 364,446 (47,640) 364,446 (47,640) U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities — — 463,572 (63,276) 463,572 (63,276) Residential mortgage-backed securities 9,402 (558) 1,661,112 (229,155) 1,670,514 (229,713) Municipal securities 2,825 (15) 254,773 (36,327) 257,598 (36,342) Non-agency mortgage-backed securities: Commercial mortgage-backed securities 2,742 (4) 364,774 (42,058) 367,516 (42,062) Residential mortgage-backed securities — — 553,671 (89,664) 553,671 (89,664) Corporate debt securities — — 502,425 (151,076) 502,425 (151,076) Foreign government bonds 110,955 (144) 88,616 (11,384) 199,571 (11,528) Asset-backed securities — — 42,300 (934) 42,300 (934) CLOs — — 612,861 (4,389) 612,861 (4,389) Total AFS debt securities $ 125,924 $ (721) $ 5,532,528 $ (728,216) $ 5,658,452 $ (728,937) December 31, 2022 Less Than 12 Months 12 Months or More Total ($ in thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses AFS debt securities: U.S. Treasury securities $ 131,843 $ (8,761) $ 474,360 $ (61,342) $ 606,203 $ (70,103) U.S. government agency and U.S. government-sponsored enterprise debt securities 97,403 (6,902) 214,136 (49,364) 311,539 (56,266) U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 252,144 (30,029) 248,125 (47,094) 500,269 (77,123) Residential mortgage-backed securities 307,536 (20,346) 1,448,658 (228,554) 1,756,194 (248,900) Municipal securities 95,655 (10,194) 159,439 (36,594) 255,094 (46,788) Non-agency mortgage-backed securities: Commercial mortgage-backed securities 106,184 (3,309) 282,301 (46,087) 388,485 (49,396) Residential mortgage-backed securities 22,715 (1,546) 626,509 (111,432) 649,224 (112,978) Corporate debt securities 173,595 (17,907) 352,679 (129,321) 526,274 (147,228) Foreign government bonds 107,576 (429) 36,143 (13,857) 143,719 (14,286) Asset-backed securities 12,450 (524) 36,626 (1,552) 49,076 (2,076) CLOs 144,365 (4,735) 453,299 (14,851) 597,664 (19,586) Total AFS debt securities $ 1,451,466 $ (104,682) $ 4,332,275 $ (740,048) $ 5,783,741 $ (844,730)
Schedule of the Gross Realized Gains and Tax Expense, Available-for-Sale	The following table presents the gross realized gains from the sales and impairment write-off of AFS debt securities and the related tax (benefit) expense included in earnings for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Gross realized gains from sales (1) $ 3,138 $ 1,306 $ 1,568 Impairment write-off (1) $ (10,000) $ — $ — Related tax (benefit) expense $ (2,029) $ 386 $ 464 (1) During 2023, the Company recognized $7 million in net losses on AFS securities as a component of noninterest income in the Company’s Consolidated Statement of Income, consisting of a $10 million impairment write-off on a subordinated debt security, partially offset by a $3 million gain on the sale of the same security.
Schedule of Composition of Interest Income on Debt Securities	The following table presents the composition of interest income on debt securities for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Taxable interest $ 255,475 $ 179,720 $ 131,985 Nontaxable interest 20,715 19,186 11,998 Total interest income on debt securities $ 276,190 $ 198,906 $ 143,983
Schedule of Contractual Maturities of AFS and HTM Debt Securities	The following tables present the contractual maturities, amortized cost, fair value and weighted average yields of AFS and HTM debt securities as of December 31, 2023. 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) Within One Year After One Year through Five Years After Five Years through Ten Years After Ten Years Total AFS debt securities: U.S. Treasury securities Amortized cost $ 436,296 $ 676,291 $ — $ — $ 1,112,587 Fair value 436,397 623,978 — — 1,060,375 Weighted-average yield (1) 5.40 % 1.20 % — % — % 2.85 % U.S. government agency and U.S. government-sponsored enterprise debt securities Amortized cost 50,000 96,470 128,169 137,447 412,086 Fair value 49,882 93,182 109,134 112,248 364,446 Weighted-average yield (1) 5.00 % 3.08 % 1.38 % 2.33 % 2.53 % U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities Amortized cost — 41,533 142,008 2,304,763 2,488,304 Fair value — 39,930 130,528 2,025,395 2,195,853 Weighted-average yield (1) (2) — % 3.13 % 2.70 % 3.68 % 3.62 % Municipal securities Amortized cost 2,240 35,100 9,624 250,319 297,283 Fair value 2,214 32,877 8,752 217,173 261,016 Weighted-average yield (1) (2) 3.39 % 2.24 % 3.22 % 2.23 % 2.27 % Non-agency mortgage-backed securities Amortized cost 96,990 77,046 — 878,877 1,052,913 Fair value 95,856 74,884 — 750,447 921,187 Weighted-average yield (1) 6.74 % 4.44 % — % 2.59 % 3.11 % Corporate debt securities Amortized cost — — 349,501 304,000 653,501 Fair value — — 290,877 211,548 502,425 Weighted average yield (1) — % — % 3.48 % 1.97 % 2.78 % Foreign government bonds Amortized cost 33,262 106,071 50,000 50,000 239,333 Fair value 33,231 106,026 49,593 39,024 227,874 Weighted-average yield (1) 3.02 % 2.28 % 5.73 % 1.50 % 2.94 % Asset-backed securities Amortized cost — — — 43,234 43,234 Fair value — — — 42,300 42,300 Weighted-average yield (1) — % — % — % 6.07 % 6.07 % CLOs Amortized cost — — 319,000 298,250 617,250 Fair value — — 315,410 297,451 612,861 Weighted average yield (1) — % — % 6.80 % 6.82 % 6.81 % Total AFS debt securities Amortized cost $ 618,788 $ 1,032,511 $ 998,302 $ 4,266,890 $ 6,916,491 Fair value $ 617,580 $ 970,877 $ 904,294 $ 3,695,586 $ 6,188,337 Weighted-average yield (1) 5.44 % 1.84 % 4.27 % 3.42 % 3.49 % ($ in thousands) Within One Year After One Year through Five Years After Five Years through Ten Years After Ten Years Total HTM debt securities: U.S. Treasury securities Amortized cost $ — $ 529,548 $ — $ — $ 529,548 Fair value — 488,551 — — 488,551 Weighted-average yield (1) — % 1.05 % — % — % 1.05 % U.S. government agency and U.S. government-sponsored enterprise debt securities Amortized cost — — 343,319 658,517 1,001,836 Fair value — — 296,124 518,808 814,932 Weighted-average yield (1) — % — % 1.90 % 1.89 % 1.90 % U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities Amortized cost — — 99,473 1,136,311 1,235,784 Fair value — — 84,323 920,374 1,004,697 Weighted-average yield (1) (2) — % — % 1.61 % 1.70 % 1.69 % Municipal securities Amortized cost — — — 188,872 188,872 Fair value — — — 145,791 145,791 Weighted-average yield (1) (2) — % — % — % 1.99 % 1.99 % Total HTM debt securities Amortized cost $ — $ 529,548 $ 442,792 $ 1,983,700 $ 2,956,040 Fair value $ — $ 488,551 $ 380,447 $ 1,584,973 $ 2,453,971 Weighted-average yield (1) — % 1.05 % 1.83 % 1.79 % 1.66 % (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.
Schedule of Restricted Equity Securities	The following table presents the restricted equity securities included in Other assets on the Consolidated Balance Sheet as of December 31, 2023 and 2022: December 31, ($ in thousands) 2023 2022 FRBSF stock $ 62,561 $ 61,374 FHLB stock 17,250 17,250 Total restricted equity securities $ 79,811 $ 78,624

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional and Fair Values of Derivatives	December 31, 2023 December 31, 2022 Fair Value Fair Value ($ in thousands) Notional Amount Assets Liabilities Notional Amount Assets Liabilities Derivatives designated as hedging instruments: Cash flow hedges: Interest rate contracts $ 5,250,000 $ 50,421 $ 13,124 $ 3,450,000 $ 13,455 $ 19,687 Net investment hedges: Foreign exchange contracts 81,480 3,394 — 84,832 5,590 — Total derivatives designated as hedging instruments $ 5,331,480 $ 53,815 $ 13,124 $ 3,534,832 $ 19,045 $ 19,687 Derivatives not designated as hedging instruments: Interest rate contracts $ 17,387,909 $ 423,486 $ 420,812 $ 16,932,414 $ 426,828 $ 564,829 Commodity contracts (1) — 79,604 121,670 — 261,613 258,608 Foreign exchange contracts 5,827,149 53,678 42,564 2,982,891 47,519 44,117 Credit contracts (2) 118,391 1 25 140,950 — 23 Equity contracts — 336 (3) 15,119 (4) — 323 (3) — Total derivatives not designated as hedging instruments $ 23,333,449 $ 557,105 $ 600,190 $ 20,056,255 $ 736,283 $ 867,577 Gross derivative assets/liabilities $ 610,920 $ 613,314 $ 755,328 $ 887,264 Less: Master netting agreements (75,534) (75,534) (242,745) (242,745) Less: Cash collateral received/paid (237,258) (636) (372,038) — Net derivative assets/liabilities $ 298,128 $ 537,144 $ 140,545 $ 644,519 (1) The notional amount of the Company’s commodity contracts totaled 18,631 thousand barrels of crude oil and 328,844 thousand units of natural gas, measured in million British thermal units (“MMBTUs”) as of December 31, 2023. In comparison, the notional amount of the Company’s commodity contracts totaled 12,005 thousand barrels of crude oil and 247,704 thousand MMBTUs of natural gas as of December 31, 2022. (2) Notional amount for credit contracts reflects the Company’s pro-rata share of the derivative instruments in RPAs. (3) The Company held equity contracts in 11 private companies and one public company as of December 31, 2023, and 13 private companies and one public company as of December 31, 2022. (4) Equity contracts classified as derivative liabilities consist of 349,138 performance-based RSUs granted as part of EWBC’s consideration in its investment in Rayliant. The following table presents the notional amounts and the gross fair values of the interest rate and foreign exchange derivatives entered into with customers and with third-party financial institutions as economic hedges to customers’ positions as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Fair Value Fair Value ($ in thousands) Notional Amount Assets Liabilities Notional Amount Assets Liabilities Customer-related positions: Interest rate contracts: Swaps $ 6,835,822 $ 25,649 $ 377,388 $ 6,656,491 $ 1,438 $ 521,719 Written options 1,522,531 — 12,756 1,548,158 — 30,904 Collars and corridors 322,732 440 4,481 215,773 — 8,924 Subtotal 8,681,085 26,089 394,625 8,420,422 1,438 561,547 Foreign exchange contracts: Forwards and spot 956,618 9,466 6,756 993,588 17,009 18,090 Swaps 1,588,491 5,801 18,118 623,143 6,629 12,178 Other 136,000 1,839 — 121,631 2,070 245 Subtotal 2,681,109 17,106 24,874 1,738,362 25,708 30,513 Total $ 11,362,194 $ 43,195 $ 419,499 $ 10,158,784 $ 27,146 $ 592,060 Other economic hedges: Interest rate contracts: Swaps $ 6,861,561 $ 380,123 $ 25,731 $ 6,683,828 $ 384,201 $ 2,047 Purchased options 1,522,531 12,783 — 1,580,275 32,233 — Written options — — — 32,117 — 1,235 Collars and corridors 322,732 4,491 456 215,772 8,956 — Subtotal 8,706,824 397,397 26,187 8,511,992 425,390 3,282 Foreign exchange contracts: Forwards and spot 148,003 292 94 77,998 3,050 87 Swaps 2,862,037 36,280 15,757 1,044,900 18,516 11,447 Other 136,000 — 1,839 121,631 245 2,070 Subtotal 3,146,040 36,572 17,690 1,244,529 21,811 13,604 Total $ 11,852,864 $ 433,969 $ 43,877 $ 9,756,521 $ 447,201 $ 16,886 The Company enters into energy commodity contracts with its customers in the oil and gas sector, which allow them to hedge against the risk of fluctuation in energy commodity prices. Offsetting contracts entered with third-party financial institutions are used as economic hedges to manage the Company’s exposure on its customer-related positions. The following table presents the notional amounts in units and the gross fair values of the commodity derivatives issued for customer-related positions and other economic hedges as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Fair Value Fair Value ($ in thousands) Notional Units Assets Liabilities Notional Units Assets Liabilities Customer-related positions: Commodity contracts: Crude oil: Swaps 3,277 Barrels $ 3,735 $ 15,445 2,465 Barrels $ 39,955 $ 6,178 Collars 5,966 Barrels 1,820 5,103 3,011 Barrels 16,038 2,630 Written options — Barrels — — — Barrels 558 — Subtotal 9,243 Barrels 5,555 20,548 5,476 Barrels 56,551 8,808 Natural gas: Swaps 118,325 MMBTUs 438 73,793 92,590 MMBTUs 112,314 73,208 Collars 45,854 MMBTUs 21 20,400 32,072 MMBTUs 2,217 18,317 Written options 1,874 MMBTUs — 233 — MMBTUs — — Subtotal 166,053 MMBTUs 459 94,426 124,662 MMBTUs 114,531 91,525 Total $ 6,014 $ 114,974 $ 171,082 $ 100,333 Other economic hedges: Commodity contracts: Crude oil: Swaps 3,422 Barrels $ 9,166 $ 4,924 2,587 Barrels $ 6,935 $ 36,060 Collars 5,966 Barrels 1,685 1,467 3,942 Barrels 1,378 12,856 Purchased options — Barrels — — — Barrels — 516 Subtotal 9,388 Barrels 10,851 6,391 6,529 Barrels 8,313 49,432 Natural gas: Swaps 116,463 MMBTUs 49,941 305 91,900 MMBTUs 69,767 106,883 Collars 44,454 MMBTUs 12,565 — 31,142 MMBTUs 12,451 1,960 Purchased options 1,874 MMBTUs 233 — — MMBTUs — — Subtotal 162,791 MMBTUs 62,739 305 123,042 MMBTUs 82,218 108,843 Total $ 73,590 $ 6,696 $ 90,531 $ 158,275
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 years ended December 31, 2023, 2022 and 2021. The after-tax impact of cash flow hedges on AOCI is shown in Note 15 — Accumulated Other Comprehensive Income (Loss) to the Consolidated Financial Statements in this Form 10-K. Year Ended December 31, ($ in thousands) 2023 2022 2021 (Losses) gains recognized in AOCI: Interest rate contracts $ (5,767) $ (74,069) $ 1,210 Gains (losses) reclassified from AOCI into earnings: Interest expense (for cash flow hedges on borrowings) $ 696 $ 3,200 $ (868) Interest and dividend income (for cash flow hedges on loans) (82,153) (7,204) — Noninterest income 1,614 (1) — — Total $ (79,843) $ (4,004) $ (868) (1) Represents the amounts in AOCI reclassified into earnings as a result that the forecasted cash flows were no longer probable to occur.
Schedule of Net Investment Hedges in Accumulated Other Comprehensive Income (Loss)	The following table presents the pre-tax gains (losses) recognized in AOCI on net investment hedges for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Gains (losses) recognized in AOCI $ 2,571 $ 4,509 $ (4,558)
Schedule of Net Gains (Losses) Recognized on the Consolidated Statements of Income Related to Derivatives not Designated as Hedging Instruments	The following table presents the net gains (losses) recognized on the Company’s Consolidated Statement of Income related to derivatives not designated as hedging instruments for the years ended December 31, 2023, 2022 and 2021: Classification on Consolidated Statement of Income Year Ended December 31, ($ in thousands) 2023 2022 2021 Derivatives not designated as hedging instruments: Interest rate contracts Customer derivative income $ (2,989) $ 13,905 $ 11,493 Foreign exchange contracts Foreign exchange income 52,817 13,799 45,921 Credit contracts Customer derivative income (1) 118 139 Equity contracts - warrants Lending fees 13 151 382 Commodity contracts Customer derivative income (25) 48 (58) Net gains $ 49,815 $ 28,021 $ 57,877
Schedule of Gross Derivative Fair Values, the Balance Sheet Netting Adjustments and Net Fair Values on the Consolidated Balance Sheets, As Well As the Cash and Non-Cash Collateral	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 to the fair values of contracts cleared through central clearing organizations, where applicable. The collateral amounts in the following tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of overcollateralization are not shown: ($ in thousands) As of December 31, 2023 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 $ 610,920 $ (75,534) $ (237,258) $ 298,128 $ (246,259) $ 51,869 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 $ 613,314 $ (75,534) $ (636) $ 537,144 $ — $ 537,144 ($ in thousands) As of December 31, 2022 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 $ 755,328 $ (242,745) $ (372,038) $ 140,545 $ (60,567) $ 79,978 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 $ 887,264 $ (242,745) $ — $ 644,519 $ (38,438) $ 606,081 (1) Includes $3 million and $2 million of gross fair value assets with counterparties that were not subject to enforceable master netting arrangements or similar agreements as of December 31, 2023 and 2022, respectively. (2) Includes $16 million and $1 million of gross fair value liabilities with counterparties that were not subject to enforceable master netting arrangements or similar agreements as of December 31, 2023 and 2022, respectively. (3) Gross cash collateral received under master netting arrangements or similar agreements were $244 million and $385 million as of December 31, 2023 and 2022, respectively. Of the gross cash collateral received, $237 million and $372 million were used to offset against derivative assets as of December 31, 2023 and 2022, respectively. (4) Gross cash collateral pledged under master netting arrangements or similar agreements were $1 million and $490 thousand as of December 31, 2023 and 2022, respectively. Of the gross cash collateral pledged, $1 million was used to offset against derivative liabilities as of December 31, 2023. In comparison, no cash collateral was used to offset against derivative liabilities as of December 31, 2022. (5) Represents the fair value of security collateral received or pledged limited to derivative assets or liabilities that are subject to enforceable master netting arrangements or similar agreements. U.S. GAAP does not permit the netting of noncash collateral on the Consolidated Balance Sheet but requires disclosure of such amounts.

Loans Receivable and Allowanc_2

Loans Receivable and Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Abstract]
Schedule of the Composition of Loan Held-For-Investment	The following table presents the composition of the Company’s loans held-for-investment outstanding as of December 31, 2023 and 2022: ($ in thousands) December 31, 2023 December 31, 2022 Commercial: C&I $ 16,581,079 $ 15,711,095 CRE: CRE 14,777,081 13,857,870 Multifamily residential 5,023,163 4,573,068 Construction and land 663,868 638,420 Total CRE 20,464,112 19,069,358 Total commercial 37,045,191 34,780,453 Consumer: Residential mortgage: Single-family residential 13,383,060 11,223,027 HELOCs 1,722,204 2,122,655 Total residential mortgage 15,105,264 13,345,682 Other consumer 60,327 76,295 Total consumer 15,165,591 13,421,977 Total loans held-for-investment (1) $ 52,210,782 $ 48,202,430 Allowance for loan losses (668,743) (595,645) Loans held-for-investment, net (1) $ 51,542,039 $ 47,606,785 (1) Includes $71 million and $70 million of net deferred loan fees and net unamortized premiums as of December 31, 2023 and 2022, respectively.
Schedule Of Loans Held-For-Investment By Loan Portfolio Segments, Internal Risk Ratings, Gross Write-Offs And Vintage Year	The following tables summarize the Company’s loans held-for-investment and current year-to-date gross write-offs by loan portfolio segments, internal risk ratings and vintage year as of December 31, 2023 and 2022. The vintage year is the year of loan origination, renewal or major modification. Revolving loans that are converted to term loans presented in the tables below are excluded from term loans by vintage year columns. December 31, 2023 Term Loans by Origination Year ($ in thousands) 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans (1) Total Commercial: C&I: Pass $ 2,314,463 $ 1,628,560 $ 1,296,936 $ 331,982 $ 245,173 $ 164,159 $ 10,053,757 $ 20,143 $ 16,055,173 Criticized (accrual) 105,119 67,899 120,574 15,064 40,920 22,098 117,196 — 488,870 Criticized (nonaccrual) 2,104 7,916 131 4,819 2,979 18,137 950 — 37,036 Total C&I 2,421,686 1,704,375 1,417,641 351,865 289,072 204,394 10,171,903 20,143 16,581,079 YTD gross write-offs (2) 350 10,454 424 3,758 9,748 2,648 1,593 — 28,975 CRE: Pass 2,492,915 4,086,385 2,216,257 1,428,724 1,600,844 2,494,382 92,851 62,771 14,475,129 Criticized (accrual) 36,855 34,485 30,336 48,250 24,437 104,340 — — 278,703 Criticized (nonaccrual) — — — — 444 22,805 — — 23,249 Subtotal CRE 2,529,770 4,120,870 2,246,593 1,476,974 1,625,725 2,621,527 92,851 62,771 14,777,081 YTD gross write-offs (2) — — — — — 1,329 — — 1,329 Multifamily residential: Pass 665,780 1,481,161 808,333 612,408 498,491 857,713 8,690 1,281 4,933,857 Criticized (accrual) — 3,356 54,614 — 693 25,974 — — 84,637 Criticized (nonaccrual) — — — — — 4,669 — — 4,669 Subtotal multifamily residential 665,780 1,484,517 862,947 612,408 499,184 888,356 8,690 1,281 5,023,163 YTD gross write-offs — — — — — 3 — — 3 Construction and land: Pass 209,775 280,151 120,724 39,928 808 5,501 6,981 $ — 663,868 Criticized (accrual) — — — — — — — — — Criticized (nonaccrual) — — — — — — — — — Subtotal construction and land 209,775 280,151 120,724 39,928 808 5,501 6,981 — 663,868 YTD gross write-offs (2) — — — — — — — — — Total CRE 3,405,325 5,885,538 3,230,264 2,129,310 2,125,717 3,515,384 108,522 64,052 20,464,112 YTD gross write-offs (2) — — — — — 1,332 — — 1,332 Total commercial $ 5,827,011 $ 7,589,913 $ 4,647,905 $ 2,481,175 $ 2,414,789 $ 3,719,778 $ 10,280,425 $ 84,195 $ 37,045,191 YTD total commercial gross write-offs (2) $ 350 $ 10,454 $ 424 $ 3,758 $ 9,748 $ 3,980 $ 1,593 $ — $ 30,307 December 31, 2023 Term Loans by Origination Year ($ in thousands) 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans (1) Total Consumer: Residential mortgage: Single-family residential: Pass (3) $ 3,188,830 $ 3,340,789 $ 2,279,802 $ 1,594,525 $ 980,686 $ 1,959,974 $ — $ — $ 13,344,606 Criticized (accrual) 2,680 4,471 566 1,440 1,503 4,167 — — 14,827 Criticized (nonaccrual) (3) 4,466 837 3,902 2,081 3,626 8,715 — — 23,627 Subtotal single-family residential mortgage 3,195,976 3,346,097 2,284,270 1,598,046 985,815 1,972,856 — — 13,383,060 YTD gross write-offs — — — — — — — — — HELOCs: Pass 3,641 3,882 1,734 3,153 729 9,251 1,551,074 126,280 1,699,744 Criticized (accrual) 565 1,219 1,872 101 185 1,470 2,548 1,089 9,049 Criticized (nonaccrual) 815 856 413 72 584 6,863 279 3,529 13,411 Subtotal HELOCs 5,021 5,957 4,019 3,326 1,498 17,584 1,553,901 130,898 1,722,204 YTD gross write-offs (2) — — — — — 41 — 6 47 Total residential mortgage 3,200,997 3,352,054 2,288,289 1,601,372 987,313 1,990,440 1,553,901 130,898 15,105,264 YTD gross write-offs (2) — — — — — 41 — 6 47 Other consumer: Pass 2,286 18,098 135 — — 13,244 26,432 $ — 60,195 Criticized (accrual) — — — — — — — — — Criticized (nonaccrual) — — — — — — 132 — 132 Total other consumer 2,286 18,098 135 — — 13,244 26,564 — 60,327 YTD gross write-offs (2) — — — — — — — — — Total consumer $ 3,203,283 $ 3,370,152 $ 2,288,424 $ 1,601,372 $ 987,313 $ 2,003,684 $ 1,580,465 $ 130,898 $ 15,165,591 YTD total consumer gross write-offs (2) $ — $ — $ — $ — $ — $ 41 $ — $ 6 $ 47 Total loans held-for-investment: Pass $ 8,877,690 $ 10,839,026 $ 6,723,921 $ 4,010,720 $ 3,326,731 $ 5,504,224 $ 11,739,785 $ 210,475 $ 51,232,572 Criticized (accrual) 145,219 111,430 207,962 64,855 67,738 158,049 119,744 1,089 876,086 Criticized (nonaccrual) 7,385 9,609 4,446 6,972 7,633 61,189 1,361 3,529 102,124 Total $ 9,030,294 $ 10,960,065 $ 6,936,329 $ 4,082,547 $ 3,402,102 $ 5,723,462 $ 11,860,890 $ 215,093 $ 52,210,782 YTD total loans held-for-investment gross write-offs (2) $ 350 $ 10,454 $ 424 $ 3,758 $ 9,748 $ 4,021 $ 1,593 $ 6 $ 30,354 December 31, 2022 Term Loans by Origination Year ($ in thousands) 2022 2021 2020 2019 2018 Prior Revolving Loans Revolving Loans Converted to Term Loans (1) Total Commercial: C&I: Pass $ 2,831,834 $ 2,053,215 $ 623,026 $ 392,013 $ 143,970 $ 97,605 $ 9,177,401 $ 20,548 $ 15,339,612 Criticized (accrual) 72,210 34,296 48,761 34,221 20,646 12,933 97,988 — 321,055 Criticized (nonaccrual) 18,722 4,797 10,733 243 5,618 10,315 — — 50,428 Total C&I 2,922,766 2,092,308 682,520 426,477 170,234 120,853 9,275,389 20,548 15,711,095 CRE: Pass 4,178,780 2,404,634 1,505,150 1,771,679 1,471,710 1,909,925 165,653 22,009 13,429,540 Criticized (accrual) 3,518 60,573 159,424 40,095 91,132 32,173 1,455 16,716 405,086 Criticized (nonaccrual) — 19,044 — — — 4,200 — — 23,244 Subtotal CRE 4,182,298 2,484,251 1,664,574 1,811,774 1,562,842 1,946,298 167,108 38,725 13,857,870 Multifamily residential: Pass 1,500,289 892,598 641,677 519,614 350,044 625,293 11,325 — 4,540,840 Criticized (accrual) — — — 707 4,276 27,076 — — 32,059 Criticized (nonaccrual) — — — — — 169 — — 169 Subtotal multifamily residential 1,500,289 892,598 641,677 520,321 354,320 652,538 11,325 — 4,573,068 Construction and land: Pass 288,394 276,839 31,804 3,104 2,805 231 9,073 — 612,250 Criticized (accrual) 4,504 — — — 21,666 — — — 26,170 Criticized (nonaccrual) — — — — — — — — — Subtotal construction and land 292,898 276,839 31,804 3,104 24,471 231 9,073 — 638,420 Total CRE 5,975,485 3,653,688 2,338,055 2,335,199 1,941,633 2,599,067 187,506 38,725 19,069,358 Total commercial $ 8,898,251 $ 5,745,996 $ 3,020,575 $ 2,761,676 $ 2,111,867 $ 2,719,920 $ 9,462,895 $ 59,273 $ 34,780,453 Consumer: Single-family residential: Pass (3) $ 3,548,894 $ 2,453,717 $ 1,775,696 $ 1,101,965 $ 817,164 $ 1,500,359 $ — $ — $ 11,197,795 Criticized (accrual) — 1,275 785 1,463 4,352 3,935 — — 11,810 Criticized (nonaccrual) (3) 141 — 204 3,202 1,721 8,154 — — 13,422 Subtotal single-family residential mortgage 3,549,035 2,454,992 1,776,685 1,106,630 823,237 1,512,448 — — 11,223,027 HELOCs: Pass 520 3,583 7,336 3,203 525 8,960 1,958,692 127,401 2,110,220 Criticized (accrual) — 6 — — — — 4 1,079 1,089 Criticized (nonaccrual) — — 483 231 1,017 4,844 1,001 3,770 11,346 Subtotal HELOCs 520 3,589 7,819 3,434 1,542 13,804 1,959,697 132,250 2,122,655 Total residential mortgage 3,549,555 2,458,581 1,784,504 1,110,064 824,779 1,526,252 1,959,697 132,250 13,345,682 Other consumer: Pass 17,088 137 5,356 — — 15,808 37,804 — 76,193 Criticized (accrual) 3 — — — — — — — 3 Criticized (nonaccrual) — — — — — — 99 — 99 Total other consumer 17,091 137 5,356 — — 15,808 37,903 — 76,295 Total consumer $ 3,566,646 $ 2,458,718 $ 1,789,860 $ 1,110,064 $ 824,779 $ 1,542,060 $ 1,997,600 $ 132,250 $ 13,421,977 Total by risk rating: Pass $ 12,365,799 $ 8,084,723 $ 4,590,045 $ 3,791,578 $ 2,786,218 $ 4,158,181 $ 11,359,948 $ 169,958 $ 47,306,450 Criticized (accrual) 80,235 96,150 208,970 76,486 142,072 76,117 99,447 17,795 797,272 Criticized (nonaccrual) 18,863 23,841 11,420 3,676 8,356 27,682 1,100 3,770 98,708 Total $ 12,464,897 $ 8,204,714 $ 4,810,435 $ 3,871,740 $ 2,936,646 $ 4,261,980 $ 11,460,495 $ 191,523 $ 48,202,430 (1) $29 million, $26 million and $6 million of total commercial loans, primarily comprised of CRE revolving loans, converted to term loans during the years ended December 31, 2023, 2022 and 2021, respectively. During the years ended December 31, 2023 and 2021, respectively, $44 million and $54 million of total consumer loans, comprised of HELOCs, converted to term loans. For the year ended December 31, 2022, no consumer loans converted to term loans. (2) Excludes gross write-offs associated with loans the Company sold or settled. (3) As of each of December 31, 2023 and 2022, $1 million of nonaccrual loans whose payments were guaranteed by the Federal Housing Administration were classified with a “Pass” rating.
Schedule of Aging Analysis of Loans	The following tables present the aging analysis of loans held-for-investment as of December 31, 2023 and 2022: December 31, 2023 ($ in thousands) Current Accruing Loans Accruing Loans 30-59 Days Past Due Accruing Loans 60-89 Days Past Due Total Accruing Past Due Loans Total Nonaccrual Loans Total Loans Commercial: C&I $ 16,508,394 $ 28,550 $ 7,099 $ 35,649 $ 37,036 $ 16,581,079 CRE: CRE 14,750,315 1,719 1,798 3,517 23,249 14,777,081 Multifamily residential 5,017,897 597 — 597 4,669 5,023,163 Construction and land 650,617 13,251 — 13,251 — 663,868 Total CRE 20,418,829 15,567 1,798 17,365 27,918 20,464,112 Total commercial 36,927,223 44,117 8,897 53,014 64,954 37,045,191 Consumer: Residential mortgage: Single-family residential 13,313,455 29,285 15,943 45,228 24,377 13,383,060 HELOCs 1,687,301 12,266 9,226 21,492 13,411 1,722,204 Total residential mortgage 15,000,756 41,551 25,169 66,720 37,788 15,105,264 Other consumer 56,930 3,123 142 3,265 132 60,327 Total consumer 15,057,686 44,674 25,311 69,985 37,920 15,165,591 Total $ 51,984,909 $ 88,791 $ 34,208 $ 122,999 $ 102,874 $ 52,210,782 December 31, 2022 ($ in thousands) Current Accruing Loans Accruing Loans 30-59 Days Past Due Accruing Loans 60-89 Days Past Due Total Accruing Past Due Loans Total Nonaccrual Loans Total Loans Commercial: C&I $ 15,651,312 $ 6,482 $ 2,873 $ 9,355 $ 50,428 $ 15,711,095 CRE: CRE 13,820,441 14,185 — 14,185 23,244 13,857,870 Multifamily residential 4,571,899 678 322 1,000 169 4,573,068 Construction and land 638,420 — — — — 638,420 Total CRE 19,030,760 14,863 322 15,185 23,413 19,069,358 Total commercial 34,682,072 21,345 3,195 24,540 73,841 34,780,453 Consumer: Residential mortgage: Single-family residential 11,183,134 13,523 12,130 25,653 14,240 11,223,027 HELOCs 2,102,523 7,700 1,086 8,786 11,346 2,122,655 Total residential mortgage 13,285,657 21,223 13,216 34,439 25,586 13,345,682 Other consumer 73,004 109 3,083 3,192 99 76,295 Total consumer 13,358,661 21,332 16,299 37,631 25,685 13,421,977 Total $ 48,040,733 $ 42,677 $ 19,494 $ 62,171 $ 99,526 $ 48,202,430
Schedule of Amortized Cost of Loans on Nonaccrual Status with No Related Allowance for Loan Losses	The following table presents the amortized cost of loans on nonaccrual status for which there was no related allowance for loan losses as of both December 31, 2023 and 2022. Nonaccrual loans may not have an allowance for credit losses if the loan balances are well secured by collateral values and there is no loss expectation. ($ in thousands) December 31, 2023 December 31, 2022 Commercial: C&I $ 33,089 $ 11,398 CRE 22,653 22,944 Multifamily residential 4,235 — Total commercial 59,977 34,342 Consumer: Single-family residential 4,852 2,998 HELOCs 7,256 7,245 Total consumer 12,108 10,243 Total nonaccrual loans with no related allowance for loan losses $ 72,085 $ 44,585
Summary Of Modified Loans/TDRs	The following table presents the amortized cost of loans that were modified during the year ended December 31, 2023 by loan class and modification type: Year Ended December 31, 2023 Modification Type ($ in thousands) Term Extension Payment Delay Combination: Term Extension/ Payment Delay Combination: Rate Reduction/ Term Extension Combination: Rate Reduction/ Payment Delay Total Modification as a % of Loan Class Commercial: C&I $ 62,704 $ 6,842 $ — $ — $ — $ 69,546 0.42 % CRE: CRE 13,939 — — 32,470 — 46,409 0.23 % Total CRE 13,939 — — 32,470 — 46,409 Total commercial 76,643 6,842 — 32,470 — 115,955 Consumer: Residential mortgage: Single-family residential: — 10,202 3,967 — — 14,169 0.11 % HELOCs — 3,148 1,170 — 815 5,133 0.30 % Total residential mortgage — 13,350 5,137 — 815 19,302 Total consumer — 13,350 5,137 — 815 19,302 Total $ 76,643 $ 20,192 $ 5,137 $ 32,470 $ 815 $ 135,257 The following table presents the financial effects of the loan modifications for the year ended December 31, 2023 by loan class and modification type: Financial Effects of Loan Modifications Year Ended December 31, 2023 ($ in thousands) Principal Forgiveness Weighted-Average Interest Rate Reduction Weighted-Average Term Extension Weighted-Average Payment Delay Commercial: C&I $ 371 (1) — % (1) 1.3 years 0.9 years CRE — 3.00 % 2.1 years — Consumer: Single-family residential — — % 9.3 years 1.8 years HELOCs — 0.11 % 14.2 years 4.6 years Total $ 371 (1) Comprised of C&I loans modified during the year ended December 31, 2023 where the interest rate is waived in addition to principal forgiveness. No recorded investment was outstanding as of December 31, 2023. The following table presents the additions to TDRs for the years ended December 31, 2022, and 2021: Loans Modified as TDRs During the Year Ended December 31, 2022 December 31, 2021 ($ in thousands) 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 7 $ 69,050 $ 38,415 $ 12,638 5 $ 24,155 $ 20,263 $ 1,108 CRE: Multifamily residential — — — — 1 1,101 1,066 — Total CRE — — — — 1 1,101 1,066 — Total commercial 7 69,050 38,415 12,638 6 25,256 21,329 1,108 Consumer: Residential mortgage: HELOCs 2 662 697 2 — — — — Total residential mortgage 2 662 697 2 — — — — Total consumer 2 662 697 2 — — — — Total 9 $ 69,712 $ 39,112 $ 12,640 6 $ 25,256 $ 21,329 $ 1,108 (1) Includes subsequent payments after modification and reflects the balance as of December 31, 2022 and 2021. (2) Includes charge-offs and specific reserves recorded since the modification date. Loans modified more than once are reported in the period they were first modified. The following table presents the TDR post-modification outstanding balances by the primary modification type for the years ended December 31, 2022 and 2021: Modification Type During the Year Ended December 31, 2022 December 31, 2021 ($ in thousands) Principal (1) Interest Rate Reduction Other (2) Total Principal (1) Interest Rate Reduction Other Total Commercial: C&I $ 24,238 $ — $ 14,177 $ 38,415 $ 4,679 $ 15,584 $ — $ 20,263 CRE: Multifamily residential — — — — 1,066 — — 1,066 Total CRE — — — — 1,066 — — 1,066 Total commercial 24,238 — 14,177 38,415 5,745 15,584 — 21,329 Consumer: Residential mortgage: HELOCs 697 — — 697 — — — — Total residential mortgage 697 — — 697 — — — — Total consumer 697 — — 697 — — — — Total $ 24,935 $ — $ 14,177 $ 39,112 $ 5,745 $ 15,584 $ — $ 21,329 (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 primarily funding to secure additional collateral and provide liquidity to collateral-dependent and term extension to C&I loans.
Schedule of Financing Receivable, Modified, Payment Performance	The following table presents the performance of loans that were modified as of December 31, 2023 since the adoption of ASU 2022-02 on January 1, 2023: Payment Performance as of December 31, 2023 ($ in thousands) Current 30-89 Days Past Due 90+ Days Past Due Total Commercial: C&I $ 52,087 $ 8,153 $ 9,306 $ 69,546 CRE: CRE 46,409 — — 46,409 Total CRE 46,409 — — 46,409 Total commercial 98,496 8,153 9,306 115,955 Consumer: Residential mortgage: Single-family residential 11,197 2,425 547 14,169 HELOCs 4,207 177 749 5,133 Total residential mortgage 15,404 2,602 1,296 19,302 Total consumer 15,404 2,602 1,296 19,302 Total $ 113,900 $ 10,755 $ 10,602 $ 135,257
Summary of TDR Loans Subsequently Defaulted	The following table presents information on loans that entered into default during the years ended December 31, 2022 and 2021 that were modified as TDRs during the 12 months preceding payment default: Loans Modified as TDRs that Subsequently Defaulted 2022 2021 ($ in thousands) Number of Loans Recorded Investment Number of Loans Recorded Investment Commercial: C&I 2 $ 10,296 1 $ 11,431 Total commercial 2 10,296 1 11,431 Total 2 $ 10,296 1 $ 11,431
Key Credit Risk Characteristics and Macroeconomic Variables	The following table provides key credit risk characteristics and macroeconomic variables that the Company uses to estimate the expected credit losses by portfolio segment: Portfolio Segment Risk Characteristics Macroeconomic Variables C&I Age percentage, size at origination, delinquency status, sector and risk rating Unemployment rate, Gross Domestic Product (“GDP”), and U.S. Treasury rates (1) 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 score, delinquency status, maturity date, collateral value, and geographic location Unemployment rate, GDP, and Home Price Indices Other consumer Loss rate approach Immaterial (2) (1) Macroeconomic variables were updated due to model redevelopment. (2) Macroeconomic variables are included in the qualitative estimate.
Summary of the Activity in the Allowance for Credit Losses	The following tables summarize the activity in the allowance for loan losses by portfolio segments for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, 2023 Commercial Consumer CRE Residential Mortgage ($ in thousands) C&I CRE Multifamily Residential Construction and Land Single-Family Residential HELOCs Other Consumer Total Allowance for loan losses, December 31, 2022 $ 371,700 $ 149,864 $ 23,373 $ 9,109 $ 35,564 $ 4,475 $ 1,560 $ 595,645 Impact of ASU 2022-02 adoption 5,683 337 6 — 1 1 — 6,028 Allowance for loan losses, beginning of period 377,383 150,201 23,379 9,109 35,565 4,476 1,560 601,673 Provision for (reversal of) credit losses on loans (a) 45,319 27,007 10,454 11,537 19,384 (424) 294 113,571 Gross charge-offs (36,573) (7,048) (3) (10,413) — (138) (197) (54,372) Gross recoveries 6,803 432 545 236 69 33 — 8,118 Total net (charge-offs) recoveries (29,770) (6,616) 542 (10,177) 69 (105) (197) (46,254) Foreign currency translation adjustment (247) — — — — — — (247) Allowance for loan losses, end of period $ 392,685 $ 170,592 $ 34,375 $ 10,469 $ 55,018 $ 3,947 $ 1,657 $ 668,743 Year Ended December 31, 2022 Commercial Consumer CRE Residential Mortgage ($ in thousands) C&I CRE Multifamily Residential Construction and Land Single-Family Residential HELOCs Other Consumer Total Allowance for loan losses, beginning of period $ 338,252 $ 150,940 $ 14,400 $ 15,468 $ 17,160 $ 3,435 $ 1,924 $ 541,579 Provision for (reversal of) credit losses on loans (a) 37,604 8,212 15,651 (6,433) 18,867 1,124 (258) 74,767 Gross charge-offs (18,738) (10,871) (7,237) — (775) (193) (106) (37,920) Gross recoveries 16,824 1,583 559 74 312 109 — 19,461 Total net (charge-offs) recoveries (1,914) (9,288) (6,678) 74 (463) (84) (106) (18,459) Foreign currency translation adjustment (2,242) — — — — — — (2,242) Allowance for loan losses, end of period $ 371,700 $ 149,864 $ 23,373 $ 9,109 $ 35,564 $ 4,475 $ 1,560 $ 595,645 Year Ended December 31, 2021 Commercial Consumer CRE Residential Mortgage ($ in thousands) C&I CRE Multifamily Residential Construction and Land Single-Family Residential HELOCs Other Consumer Total Allowance for loan losses, beginning of period $ 398,040 $ 163,791 $ 27,573 $ 10,239 $ 15,520 $ 2,690 $ 2,130 $ 619,983 (Reversal of) provision for credit losses on loans (a) (39,732) 14,282 (15,076) 7,576 1,965 745 1,286 (28,954) Gross charge-offs (32,490) (28,430) (130) (2,954) (1,046) (45) (1,497) (66,592) Gross recoveries 11,906 1,297 2,033 607 721 45 5 16,614 Total net (charge-offs) recoveries (20,584) (27,133) 1,903 (2,347) (325) — (1,492) (49,978) Foreign currency translation adjustment 528 — — — — — — 528 Allowance for loan losses, end of period $ 338,252 $ 150,940 $ 14,400 $ 15,468 $ 17,160 $ 3,435 $ 1,924 $ 541,579 Year Ended December 31, ($ in thousands) 2023 2022 2021 Unfunded credit facilities Allowance for unfunded credit commitments, beginning of period $ 26,264 $ 27,514 $ 33,577 Provision for (reversal of) credit losses on unfunded credit commitments (b) 11,429 (1,267) (6,046) Foreign currency translation adjustments 6 17 (17) Allowance for unfunded credit commitments, end of period 37,699 26,264 27,514 Provision for (reversal of) credit losses (a) + (b) $ 125,000 $ 73,500 $ (35,000)
Schedule of Carrying Value of Loans Transferred, Loans Sold and Purchased for the Held-for-Investment Portfolio	The following tables provide information on the carrying value of loans transferred, sold and purchased for the held-for-investment portfolio, during the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, 2023 Commercial Consumer CRE Residential Mortgage ($ in thousands) C&I CRE Multifamily Residential Construction and Land Single-Family Residential Total Loans transferred from held-for-investment to held-for-sale (1) $ 647,943 $ 83,282 $ — $ 8,154 $ — $ 739,379 Sales (2)(3) $ 674,919 $ 86,749 $ — $ 8,154 $ — $ 769,822 Purchases (4) $ 106,493 $ — $ — $ — $ 493,282 $ 599,775 Year Ended December 31, 2022 Commercial Consumer CRE Residential Mortgage ($ in thousands) C&I CRE Multifamily Residential Construction and Land Single-Family Residential Total Loans transferred from held-for-investment to held-for-sale (1) $ 530,524 $ 88,075 $ — $ — $ 5,178 $ 623,777 Loans transferred from held-for-sale to held-for-investment $ — $ — $ — $ — $ 631 $ 631 Sales (2)(3) $ 501,289 $ 88,075 $ — $ — $ 6,403 $ 595,767 Purchases (4) $ 363,549 $ — $ — $ — $ 293,721 $ 657,270 Year Ended December 31, 2021 Commercial Consumer CRE Residential Mortgage ($ in thousands) C&I CRE Multifamily Residential Construction and Land Single-Family Residential Total Loans transferred from held-for-investment to held-for-sale (1) $ 496,655 $ 78,834 $ — $ 18,883 $ 5,238 $ 599,610 Sales (2)(3) $ 502,694 $ 78,834 $ — $ 21,557 $ 18,458 $ 621,543 Purchases (4) $ 476,690 $ — $ 370 $ — $ 564,651 $ 1,041,711 (1) Includes write-downs of $5 million, $3 million and $12 million to the allowance for loan losses related to loans transferred from held-for-investment to held-for-sale for the years ended December 31, 2023, 2022 and 2021, respectively. (2) Includes originated loans sold of $513 million, $388 million and $413 million for the years ended December 31, 2023, 2022 and 2021, respectively. Originated loans sold consisted primarily of C&I and CRE loans for all periods. (3) Includes $256 million of purchased loans sold in the secondary market for the year ended December 31, 2023, compared with $208 million for each of the years ended December 31, 2022 and 2021. (4) C&I loan purchases were comprised primarily of syndicated C&I term loans.

Investments in Qualified Affo_2

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2023
Investments in Qualified Affordable Housing Partnerships, Net [Abstract]
Schedule of Affordable Housing and Tax Credits and Other Investments and Unfunded Commitments	The following table presents the investments and unfunded commitments of the Company’s qualified affordable housing partnerships, tax credit, and other investments, net as of December 31, 2023 and 2022: December 31, 2023 2022 ($ in thousands) Assets Liabilities - Unfunded Commitments (1) Assets Liabilities - Unfunded Commitments (1) Investments in qualified affordable housing partnerships, net $ 419,785 $ 251,746 $ 413,253 $ 266,654 Investments in tax credit and other investments, net 485,251 298,990 350,003 185,797 Total $ 905,036 $ 550,736 $ 763,256 $ 452,451 (1) Included in Accrued expenses and other liabilities on the Consolidated Balance Sheet.
Schedule of Additional Information related to the Investments in Affordable Housing and Tax Credit and Other Investments	The following table presents additional information related to the investments in qualified affordable housing partnerships, tax credit and other investments for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Investments in qualified housing partnerships, net Tax credits and other tax benefits recognized $ 60,939 $ 52,132 $ 50,643 Amortization expense included in income tax expense $ 43,041 $ 38,759 $ 33,248 Investments in tax credit and other investments, net Amortization of tax credit and other investments (1) $ 120,299 $ 113,358 $ 122,457 Unrealized gains (losses) on equity securities with readily determinable values $ 255 $ (2,958) $ (746) (1) Includes net impairment recoveries of $1 million, $469 thousand and $1 million for the years ended December 31, 2023, 2022 and 2021, respectively. The activity was primarily related to historic and/or energy tax credits.
Schedule of Unfunded Commitments Related to Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Estimated to be Funded	As of December 31, 2023, the Company’s unfunded commitments related to investments in qualified affordable housing partnerships, tax credit and other investments, net are estimated to be funded as follows: ($ in thousands) Amount 2024 $ 339,628 2025 178,171 2026 17,882 2027 2,527 2028 2,115 Thereafter 10,413 Total $ 550,736

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2023
DEPOSIT ACCOUNTS
Schedule of Deposit Liabilities, Type	The following table presents the composition of the Company’s deposits as of December 31, 2023 and 2022: December 31, ($ in thousands) 2023 2022 Deposits: Noninterest-bearing demand $ 15,539,872 $ 21,051,090 Interest-bearing checking 7,558,908 6,672,165 Money market 13,108,727 12,265,024 Savings: Domestic office 1,638,916 2,425,784 Foreign office 202,551 223,253 Time deposits (1) : Domestic office 16,037,287 11,878,734 Foreign office 2,006,177 1,451,799 Total deposits $ 56,092,438 $ 55,967,849 (1) The aggregate amount of time deposits that met or exceeded the deposit insurance limit was $13.6 billion and $10.6 billion as of December 31, 2023 and 2022, respectively.
Schedule of Time Deposit Maturities	The following table presents the scheduled maturities of time deposits for the five years succeeding December 31, 2023: ($ in thousands) Amount 2024 $ 17,580,178 2025 134,264 2026 186,448 2027 139,279 2028 3,295 Total $ 18,043,464

Short-Term Borrowings and Lon_2

Short-Term Borrowings and Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Schedule of Debt	The following table presents details of the Company’s junior subordinated debt and short-term borrowings as of December 31, 2023 and 2022, December 31, 2023 2022 ($ in thousands) Interest Rate Maturity Dates Amount Amount Parent company Junior subordinated debt (1 ) — floating (2) 7.00% — 7.55% 2034 — 2037 $ 148,249 $ 147,950 Bank Short-term borrowings 4.37% 3/19/2024 $ 4,500,000 $ — (1) The weighted-average contractual interest rates for junior subordinated debt were 6.87% and 3.49% as of December 31, 2023 and 2022, respectively. (2) During the third quarter of 2023, all junior subordinated debt that referenced London Interbank Offered Rate transitioned to a Secured Overnight Financing Rate (“SOFR”)-based replacement rate plus the applicable stated margin.
Schedule of Components of Long-Term Debt	The following table presents the outstanding junior subordinated debt issued by each trust as of December 31, 2023 and 2022: December 31, 2023 December 31, 2022 Issuer Stated Maturity (1) Stated Interest Rate Current Rate Aggregate Principal Amount of Trust Securities Aggregate Principal Amount of the Junior Subordinated Debt Aggregate Principal Amount of Trust Securities Aggregate Principal Amount of the Junior Subordinated Debt ($ in thousands) East West Capital Trust V November 2034 3-month CME Term SOFR + 2.06% 7.44% $ 464 $ 15,000 $ 464 $ 15,000 East West Capital Trust VI September 2035 3-month CME Term SOFR + 1.76% 7.15% 619 20,000 619 20,000 East West Capital Trust VII June 2036 3-month CME Term SOFR + 1.61% 7.00% 928 30,000 928 30,000 East West Capital Trust VIII June 2037 3-month CME Term SOFR + 1.66% 7.02% 619 18,000 619 18,000 East West Capital Trust IX September 2037 3-month CME Term SOFR + 2.16% 7.55% 928 30,000 928 30,000 MCBI Statutory Trust I December 2035 3-month CME Term SOFR + 1.81% 7.20% 1,083 35,000 1,083 35,000 Total $ 4,641 $ 148,000 $ 4,641 $ 148,000 (1) The debt instruments above mature in more than five years after December 31, 2023 and are subject to call options where early redemption requires appropriate notice.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense/Benefit	The following table presents the components of income tax expense (benefit) for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Current income tax expense (benefit): Federal $ 172,428 $ 163,797 $ 84,249 State 173,080 160,629 95,939 Foreign 2,240 3,133 (1,554) Total current income tax expense 347,748 327,559 178,634 Deferred income tax (benefit) expense: Federal (24,319) (23,484) 1,528 State (23,415) (21,835) 3,259 Foreign (1,405) 1,331 (25) Total deferred income tax (benefit) expense (49,139) (43,988) 4,762 Income tax expense $ 298,609 $ 283,571 $ 183,396
Schedule of Reconciliation of the Federal Statutory Rate to the Effective Tax Rate	The following table presents the reconciliation of the federal statutory rate to the Company’s effective tax rate for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, 2023 2022 2021 Statutory U.S. federal tax rate 21.0 % 21.0 % 21.0 % U.S. state income taxes, net of U.S. federal income tax effect 8.1 7.8 7.4 Tax credits and benefits, net of related expenses (9.9) (8.9) (11.3) Other, net 1.3 0.2 0.3 Effective tax rate 20.5 % 20.1 % 17.4 %
Schedule of Temporary Differences that Give Rise to a Significant Portion of Deferred Tax Assets and Liabilities	The following table summarizes the tax effects of temporary differences that give rise to a significant portion of deferred tax assets and liabilities as of December 31, 2023 and 2022: December 31, ($ in thousands) 2023 2022 Deferred tax assets: Allowance for credit losses and nonperforming assets valuation allowance $ 217,731 $ 191,187 Investments in qualified affordable housing partnerships, tax credit and other investments, net 28,216 21,011 Stock compensation and other accrued compensation 33,169 25,857 Interest income on nonaccrual loans 7,034 5,185 State taxes 9,885 13,259 Net unrealized losses on debt securities and derivatives 242,303 309,837 Premises and equipment 1,782 3,827 Lease liabilities 32,636 34,859 FDIC special assessment charge 22,212 — Other 9,019 6,169 Total deferred tax assets $ 603,987 $ 611,191 Deferred tax liabilities: Equipment lease financing $ 15,564 $ 27,237 Investments in qualified affordable housing partnerships, tax credit and other investments, net 23,103 7,709 FHLB stock dividends 1,947 1,926 Mortgage servicing assets 2,102 1,963 Acquired debts 1,398 1,477 Prepaid expenses 2,981 2,478 Operating lease right-of-use assets 30,272 32,606 Other 7,871 6,270 Total deferred tax liabilities $ 85,238 $ 81,666 Net deferred tax assets $ 518,749 $ 529,525
Schedule of Reconciliation of the Beginning and Ending Amounts of Unrecognized Tax Benefits	The following table presents a reconciliation of the beginning and ending balances of unrecognized tax benefits for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Beginning balance $ 477 $ 5,045 $ 5,045 Additions for tax positions related to prior years 459 — — Additions for tax positions related to current year 257 — — Settlements with taxing authorities — (4,568) (1) — Ending balance $ 1,193 $ 477 $ 5,045 (1) In 2022, the Company settled an issue regarding previously claimed tax credits related to DC Solar and affiliates.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Schedule of Credit-Related Commitments	The following table presents the Company’s credit-related commitments as of December 31, 2023 and 2022: December 31, 2023 2022 ($ in thousands) Expire in One Year or Less Expire After One Year Through Three Years Expire After Three Years Through Five Years Expire After Five Years Total Total Loan commitments $ 4,576,927 $ 3,511,660 $ 889,219 $ 163,641 $ 9,141,447 $ 8,211,571 Commercial letters of credit and SBLCs 953,220 387,008 137,758 1,132,775 2,610,761 2,291,966 Total $ 5,530,147 $ 3,898,668 $ 1,026,977 $ 1,296,416 $ 11,752,208 $ 10,503,537
Schedule of Guarantees Outstanding	The following table presents the carrying amounts of loans sold or securitized with recourse and the maximum potential future payments as of December 31, 2023 and 2022: Maximum Potential Future Payments Carrying Value December 31, December 31, 2023 2022 2023 2022 ($ in thousands) Expire in One Year or Less Expire After One Year Through Three Years Expire After Three Years Through Five Years Expire After Five Years Total Total Total Total Single-family residential loans sold or securitized with recourse $ 17 $ 19 $ 28 $ 5,824 $ 5,888 $ 6,781 $ 5,888 $ 6,781 Multifamily residential loans sold or securitized with recourse — — 165 14,831 14,996 14,996 19,020 21,320 Total $ 17 $ 19 $ 193 $ 20,655 $ 20,884 $ 21,777 $ 24,908 $ 28,101

Stock Compensation Plans (Table

Stock Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Stock Compensation Expense and Related Net Tax Benefits	The following table presents a summary of the total share-based compensation expense and the related net tax benefits associated with the Company’s various employee share-based compensation plans for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, ($ in thousands) 2023 2022 2021 Stock compensation costs $ 39,867 $ 37,601 $ 32,567 Related net tax benefits for stock compensation plans $ 8,959 $ 5,293 $ 1,760
Summary of Activities 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 were settled in shares for the year ended December 31, 2023. The number of performance-based RSUs stated below reflects the number of awards granted on the grant date: Time-Based RSUs Performance-Based RSUs Shares Weighted-Average Grant Date Fair Value Shares Weighted-Average Grant Date Fair Value Outstanding, January 1, 2023 1,296,866 $ 60.77 332,510 $ 60.40 Granted 515,218 $ 73.13 96,271 $ 79.93 Vested (543,032) $ 40.93 (152,558) $ 39.79 Forfeited (62,534) $ 74.04 — $ — Outstanding, December 31, 2023 1,206,518 $ 74.29 276,223 $ 78.59

Stockholders_ Equity and Earn_2

Stockholders’ Equity and Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Schedule of Earnings Per Share Calculations	The following table presents the basic and diluted EPS calculations for the years ended December 31, 2023, 2022 and 2021. 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 in this Form 10-K. Year Ended December 31, ($ and shares in thousands, except per share data) 2023 2022 2021 Basic: Net income $ 1,161,161 $ 1,128,083 $ 872,981 Weighted-average number of shares outstanding 141,164 141,326 141,826 Basic EPS $ 8.23 $ 7.98 $ 6.16 Diluted: Net income $ 1,161,161 $ 1,128,083 $ 872,981 Weighted-average number of shares outstanding 141,164 141,326 141,826 Add: Diluted impact of unvested RSUs 738 1,166 1,314 Diluted weighted-average number of shares outstanding 141,902 142,492 143,140 Diluted EPS $ 8.18 $ 7.92 $ 6.10

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Schedule of the Changes in the Components of Accumulated Other Comprehensive Income (Loss) Balances	The following table presents the changes in the components of AOCI balances for the years ended December 31, 2023, 2022 and 2021: ($ in thousands) Debt Securities (1) Cash Flow Hedges Foreign Currency Translation Adjustments (2) Total Balance, December 31, 2020 $ 52,247 $ (1,230) $ (6,692) $ 44,325 Net unrealized (losses) gains arising during the period (136,846) 866 1,757 (134,223) Amounts reclassified from AOCI (1,104) 621 — (483) Changes, net of tax (137,950) 1,487 1,757 (134,706) Balance, December 31, 2021 $ (85,703) $ 257 $ (4,935) $ (90,381) Net unrealized losses arising during the period (620,870) (52,623) (16,348) (689,841) Amounts reclassified from AOCI 11,758 2,835 — 14,593 Changes, net of tax (609,112) (49,788) (16,348) (675,248) Balance, December 31, 2022 $ (694,815) $ (49,531) $ (21,283) $ (765,629) Net unrealized gains (losses) arising during the period 76,930 (4,277) (56) 72,597 Amounts reclassified from AOCI 16,004 56,432 — 72,436 Changes, net of tax 92,934 52,155 (56) 145,033 Balance, December 31, 2023 $ (601,881) $ 2,624 $ (21,339) $ (620,596) (1) Includes after-tax unamortized losses related to AFS debt securities that were transferred to HTM in 2022. (2) 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 table presents the components of other comprehensive income (loss), reclassifications to net income and the related tax effects for the years ended December 31, 2023, 2022 and 2021: Year Ended December 31, 2023 2022 2021 ($ in thousands) Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax Debt securities: Net unrealized gains (losses) on AFS debt securities arising during the period $ 109,216 $ (32,286) $ 76,930 $ (721,100) $ 213,221 $ (507,879) $ (194,393) $ 57,547 $ (136,846) Unrealized losses on debt securities transferred from AFS to HTM — — — (160,416) 47,425 (112,991) — — — Reclassification adjustments: Net realized losses (gains) on AFS debt securities reclassified into net income (1) 6,862 (2) (2,029) 4,833 (1,306) 386 (920) (1,568) 464 (1,104) Amortization of unrealized losses on transferred securities (3) 15,860 (4,689) 11,171 18,000 (5,322) 12,678 — — — Net change 131,938 (39,004) 92,934 (864,822) 255,710 (609,112) (195,961) 58,011 (137,950) Cash flow hedges: Net unrealized (losses) gains arising during the period (5,767) 1,490 (4,277) (74,069) 21,446 (52,623) 1,210 (344) 866 Net realized losses reclassified into net income (4) 79,843 (23,411) 56,432 4,004 (1,169) 2,835 868 (247) 621 Net change 74,076 (21,921) 52,155 (70,065) 20,277 (49,788) 2,078 (591) 1,487 Foreign currency translation adjustments, net of hedges: Net unrealized gains (losses) arising during the period 698 (754) (56) (15,059) (1,289) (16,348) 463 1,294 1,757 Net change 698 (754) (56) (15,059) (1,289) (16,348) 463 1,294 1,757 Other comprehensive income (loss) $ 206,712 $ (61,679) $ 145,033 $ (949,946) $ 274,698 $ (675,248) $ (193,420) $ 58,714 $ (134,706) (1) Pre-tax amounts were reported in Net (losses) gains on AFS debt securities on the Consolidated Statement of Income. (2) Represents the net loss related to an AFS debt security that was written-off in the first quarter of 2023 and subsequently sold during the fourth quarter of 2023. (3) Represents unrealized losses amortized over the remaining lives of securities that were transferred from the AFS to HTM portfolio in 2022. (4) Pre-tax amounts related to cash flow hedges on variable rate loans and long-term borrowings, where applicable, were reported in Interest and dividend income and in Interest expense, respectively , on the Consolidated Statement of Income. In 2023, pre-tax amount also includes the terminated cash flow hedge where the forecasted cash flows were no longer probable to occur and was reported in Noninterest income on the Consolidated Statement of Income.

Regulatory Requirements and M_2

Regulatory Requirements and Matters (Tables)	12 Months Ended
	Dec. 31, 2023
Banking and Thrift, Interest [Abstract]
Schedule of Regulatory Capital Information	The following table presents the regulatory capital information of the Company and the Bank as of December 31, 2023 and 2022: Basel III December 31, 2023 December 31, 2022 ($ in thousands) Amount Ratio Amount Ratio Minimum Capital Ratios Fully Phased-in Minimum Capital Ratios (2) Well-Capitalized Requirement Total capital (to risk-weighted assets) Company $ 7,919,407 14.8 % $ 7,003,299 14.0 % 8.0 % 10.5 % 10.0 % East West Bank $ 7,363,575 13.8 % $ 6,760,612 13.5 % 8.0 % 10.5 % 10.0 % Tier 1 capital (to risk-weighted assets) Company $ 7,140,778 13.3 % $ 6,347,108 12.7 % 6.0 % 8.5 % 6.0 % East West Bank $ 6,732,946 12.6 % $ 6,252,421 12.5 % 6.0 % 8.5 % 8.0 % CET1 capital (to risk-weighted assets) Company (1) $ 7,140,778 13.3 % $ 6,347,108 12.7 % 4.5 % 7.0 % N/A East West Bank $ 6,732,946 12.6 % $ 6,252,421 12.5 % 4.5 % 7.0 % 6.5 % Tier 1 leverage capital (to adjusted average assets) Company (1) $ 7,140,778 10.2 % $ 6,347,108 9.8 % 4.0 % 4.0 % N/A East West Bank $ 6,732,946 9.6 % $ 6,252,421 9.7 % 4.0 % 4.0 % 5.0 % Risk-weighted assets Company $ 53,663,392 N/A $ 50,036,719 N/A N/A N/A N/A East West Bank $ 53,539,980 N/A $ 50,024,772 N/A N/A N/A N/A Adjusted quarterly average total assets Company $ 70,406,008 N/A $ 65,221,597 N/A N/A N/A N/A East West Bank $ 70,270,449 N/A $ 65,198,267 N/A N/A N/A N/A N/A — Not applicable. (1) The well-capitalized requirements for CET1 capital and Tier 1 leverage capital apply only to the Bank since there is no CET1 capital ratio or Tier 1 leverage capital ratio component in the definition of a well-capitalized bank holding company. (2) Includes a 2.5% capital conservation buffer requirement above the minimum risk-based capital ratios.

Business Segments (Tables)

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Schedule of Operating Results and Key Financial Measures by Operating Segments	The following tables present the operating results and other key financial measures for the individual operating segments as of and for the years ended December 31, 2023, 2022 and 2021: ($ in thousands) Consumer and Business Banking Commercial Banking Other Total Year Ended December 31, 2023 Net interest income before provision for credit losses $ 1,238,829 $ 992,519 $ 80,906 $ 2,312,254 Provision for credit losses 18,422 106,578 — 125,000 Noninterest income 102,109 174,465 18,690 295,264 Noninterest expense 477,622 382,865 162,261 1,022,748 Segment income (loss) before income taxes 844,894 677,541 (62,665) 1,459,770 Segment net income $ 596,366 $ 478,418 $ 86,377 $ 1,161,161 As of December 31, 2023 Segment assets $ 19,510,836 $ 35,095,237 $ 15,006,811 $ 69,612,884 ($ in thousands) Consumer and Business Banking Commercial Banking Other Total Year Ended December 31, 2022 Net interest income (loss) before provision for credit losses $ 1,170,850 $ 892,386 $ (17,355) $ 2,045,881 Provision for credit losses 27,197 46,303 — 73,500 Noninterest income 110,139 179,248 9,279 298,666 Noninterest expense 397,882 314,185 147,326 859,393 Segment income (loss) before income taxes 855,910 711,146 (155,402) 1,411,654 Segment net income $ 608,120 $ 507,467 $ 12,496 $ 1,128,083 As of December 31, 2022 Segment assets $ 17,385,804 $ 33,042,785 $ 13,683,561 $ 64,112,150 ($ in thousands) Consumer and Business Banking Commercial Banking Other Total Year Ended December 31, 2021 Net interest income before reversal of provision for credit losses $ 697,101 $ 766,202 $ 68,268 $ 1,531,571 Reversal of provision for credit losses (4,998) (30,002) — (35,000) Noninterest income 94,125 163,768 28,002 285,895 Noninterest expense 364,635 275,649 155,805 796,089 Segment income (loss) before income taxes 431,589 684,323 (59,535) 1,056,377 Segment net income $ 308,630 $ 489,233 $ 75,118 $ 872,981 As of December 31, 2021 Segment assets $ 14,961,809 $ 28,556,706 $ 17,352,186 $ 60,870,701

Parent Company Condensed Fina_2

Parent Company Condensed Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2023
Condensed Financial Information Disclosure [Abstract]
Condensed Balance Sheet	The following tables present the Parent Company-only condensed financial statements: CONDENSED BALANCE SHEET December 31, ($ in thousands) 2023 2022 ASSETS Cash and cash equivalents due from subsidiary bank $ 445,770 $ 228,531 Investments in subsidiaries: Bank 6,542,852 5,889,775 Nonbank 13,502 13,846 Investments in tax credit investments, net — 1,925 Other assets 120,742 8,516 TOTAL $ 7,122,866 $ 6,142,593 LIABILITIES AND STOCKHOLDERS’ EQUITY Long-term debt $ 148,249 $ 147,950 Other liabilities 23,783 10,031 Stockholders’ equity 6,950,834 5,984,612 TOTAL $ 7,122,866 $ 6,142,593
Condensed Statement of Income	CONDENSED STATEMENT OF INCOME Year Ended December 31, ($ in thousands) 2023 2022 2021 Dividends from subsidiaries: Bank $ 704,000 $ 240,000 $ 200,000 Nonbank 322 157 82 Other investment losses (2,738) — — Other income — — 11 Total income 701,584 240,157 200,093 Interest expense on long-term debt 10,889 5,450 2,974 Compensation and employee benefits 7,204 6,708 6,370 (Impairment recoveries) amortization of tax credit and other investments (2,901) (786) 425 Other expense 1,815 2,040 1,306 Total expense 17,007 13,412 11,075 Income before income tax benefit and equity in undistributed income of subsidiaries 684,577 226,745 189,018 Income tax benefit 5,844 4,269 3,005 Undistributed earnings of subsidiaries, primarily bank 470,740 897,069 680,958 Net income $ 1,161,161 $ 1,128,083 $ 872,981
Condensed Statement of Cash Flows	CONDENSED STATEMENT OF CASH FLOWS Year Ended December 31, ($ in thousands) 2023 2022 2021 CASH FLOWS FROM OPERATING ACTIVITIES Net income $ 1,161,161 $ 1,128,083 $ 872,981 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed earnings of subsidiaries, principally bank (470,740) (897,069) (680,958) Deferred income tax expense (benefit) 948 (2,193) 2,721 Net change in other assets (4,160) 4,250 (5,685) Net change in other liabilities (47) 779 (81,706) Other operating activities, net 2,443 1,333 1,877 Net cash provided by operating activities 689,605 235,183 109,230 CASH FLOWS FROM INVESTING ACTIVITIES Net increase in investments in tax credit investments — (1,612) (346) Distributions received from equity method investees 1,594 410 436 Other investing activities, net (96,689) (6,188) (1,476) Net cash used in investing activities (95,095) (7,390) (1,386) CASH FLOWS FROM FINANCING ACTIVITIES Common stock: Proceeds from issuance pursuant to various stock compensation plans and agreements 3,208 3,178 2,573 Stock tendered for payment of withholding taxes (23,751) (19,087) (15,702) Repurchase of common stock pursuant to the stock repurchase program (82,174) (99,990) — Cash dividends paid (274,554) (228,381) (188,762) Net cash used in financing activities (377,271) (344,280) (201,891) Net increase (decrease) in cash and cash equivalents 217,239 (116,487) (94,047) Cash and cash equivalents, beginning of year 228,531 345,018 439,065 Cash and cash equivalents, end of year $ 445,770 $ 228,531 $ 345,018

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Nature of Operations and Principles of Consolidation (Details)	12 Months Ended
	Dec. 31, 2023 trust location	Dec. 31, 2022	Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of banking locations (more than) | location	120
Principles of Consolidation
Number of wholly owned subsidiaries that are statutory business trusts | trust	6
Revenue Benchmark | Customer Concentration Risk | Service Charges, Deposit Account Fees, Card Income and Wealth Managment Fees
Disaggregation of Revenue [Abstract]
Revenue streams, Percent of total non-interest income	40%	39%	35%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Premises and Equipment, net (Details)	Dec. 31, 2023
Buildings
Premises and equipment
Estimated useful life	25 years
Furniture, fixtures and equipment, and building improvements | Minimum
Premises and equipment
Estimated useful life	3 years
Furniture, fixtures and equipment, and building improvements | Maximum
Premises and equipment
Estimated useful life	7 years

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Goodwill (Details)	12 Months Ended
	Dec. 31, 2023 segment
Accounting Policies [Abstract]
Number of reportable segments	3

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - New Accounting Pronouncements Adopted (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jan. 01, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements Adopted and Recent Accounting Pronouncements [Line Items]
Allowance for loan losses	$ 668,743	$ 601,673	$ 595,645	$ 541,579	$ 619,983
Retained earnings	(6,465,230)		(5,582,546)
Accounting Standards Update 2022-02
New Accounting Pronouncements Adopted and Recent Accounting Pronouncements [Line Items]
Allowance for loan losses			$ (6,000)
Retained earnings		$ (4,000)
Accounting Standards Update 2023-02
New Accounting Pronouncements Adopted and Recent Accounting Pronouncements [Line Items]
Retained earnings	$ 10,000

Fair Value Measurement and Fa_3

Fair Value Measurement and Fair Value of Financial Instruments - Narrative (Details)	Sep. 30, 2023
Rayliant Global Advisors Limited
Investments in Tax Credit and Other Investments, Net
Equity method investment, ownership (percent)	49.99%

Fair Value Measurement and Fa_4

Fair Value Measurement and Fair Value of Financial Instruments - Financial Assets and Liabilities Measurement on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Investments in qualified affordable housing partnerships, tax credit and other investments, net:
Total investments in qualified affordable housing partnerships, tax credit and other investments, net	$ 485,251	$ 350,003
Derivative
Derivative assets - Fair value	610,920	755,328
Net derivative assets	298,128	140,545
Derivative liabilities - Fair Value	613,314	887,264
Net derivative liabilities	537,144	644,519
Fair Value, Measurements, Recurring
Debt securities available-for-sale
Fair Value	6,188,337	6,034,993
Investments in qualified affordable housing partnerships, tax credit and other investments, net:
Equity securities	24,659	23,954
Total investments in qualified affordable housing partnerships, tax credit and other investments, net	24,659	23,954
Derivative
Derivative assets - Fair value	610,920	755,328
Netting adjustments	(312,792)	(614,783)
Net derivative assets	298,128	140,545
Derivative liabilities - Fair Value	613,314	887,264
Netting adjustments	(76,170)	(242,745)
Net derivative liabilities	537,144	644,519
Fair Value, Measurements, Recurring | Interest rate contracts
Derivative
Derivative assets - Fair value	473,907	440,283
Derivative liabilities - Fair Value	433,936	584,516
Fair Value, Measurements, Recurring | Foreign exchange contracts
Derivative
Derivative assets - Fair value	57,072	53,109
Derivative liabilities - Fair Value	42,564	44,117
Fair Value, Measurements, Recurring | Credit contracts
Derivative
Derivative assets - Fair value	1
Derivative liabilities - Fair Value	25	23
Fair Value, Measurements, Recurring | Equity contracts
Derivative
Derivative assets - Fair value	336	323
Derivative liabilities - Fair Value	15,119
Fair Value, Measurements, Recurring | Commodity contracts
Derivative
Derivative assets - Fair value	79,604	261,613
Derivative liabilities - Fair Value	121,670	258,608
Fair Value, Measurements, Recurring | U.S. Treasury securities
Debt securities available-for-sale
Fair Value	1,060,375	606,203
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise debt securities
Debt securities available-for-sale
Fair Value	364,446	461,607
Fair Value, Measurements, Recurring | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Debt securities available-for-sale
Fair Value	468,259	500,269
Fair Value, Measurements, Recurring | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Debt securities available-for-sale
Fair Value	1,727,594	1,762,195
Fair Value, Measurements, Recurring | Municipal securities:
Debt securities available-for-sale
Fair Value	261,016	257,099
Fair Value, Measurements, Recurring | Non-agency commercial mortgage-backed Securities
Debt securities available-for-sale
Fair Value	367,516	398,329
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed Securities
Debt securities available-for-sale
Fair Value	553,671	649,224
Fair Value, Measurements, Recurring | Corporate debt securities
Debt securities available-for-sale
Fair Value	502,425	526,274
Fair Value, Measurements, Recurring | Foreign government bonds
Debt securities available-for-sale
Fair Value	227,874	227,053
Fair Value, Measurements, Recurring | Asset-backed securities
Debt securities available-for-sale
Fair Value	42,300	49,076
Fair Value, Measurements, Recurring | Collateralized loan obligations (“CLOs”)
Debt securities available-for-sale
Fair Value	612,861	597,664
Fair Value, Measurements, Recurring | Level 1
Debt securities available-for-sale
Fair Value	1,060,375	606,203
Investments in qualified affordable housing partnerships, tax credit and other investments, net:
Equity securities	20,509	19,777
Total investments in qualified affordable housing partnerships, tax credit and other investments, net	20,509	19,777
Derivative
Derivative assets - Fair value	0	0
Netting adjustments	0	0
Net derivative assets	0	0
Derivative liabilities - Fair Value	0	0
Netting adjustments	0	0
Net derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 1 | Interest rate contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Credit contracts
Derivative
Derivative assets - Fair value	0
Derivative liabilities - Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Equity contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair Value	0
Fair Value, Measurements, Recurring | Level 1 | Commodity contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury securities
Debt securities available-for-sale
Fair Value	1,060,375	606,203
Fair Value, Measurements, Recurring | Level 1 | U.S. government agency and U.S. government-sponsored enterprise debt securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Municipal securities:
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Non-agency commercial mortgage-backed Securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Non-agency residential mortgage-backed Securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Corporate debt securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Foreign government bonds
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Collateralized loan obligations (“CLOs”)
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 2
Debt securities available-for-sale
Fair Value	5,127,962	5,428,790
Investments in qualified affordable housing partnerships, tax credit and other investments, net:
Equity securities	4,150	4,177
Total investments in qualified affordable housing partnerships, tax credit and other investments, net	4,150	4,177
Derivative
Derivative assets - Fair value	610,584	755,005
Netting adjustments	(312,792)	(614,783)
Net derivative assets	297,792	140,222
Derivative liabilities - Fair Value	598,195	887,264
Netting adjustments	(76,170)	(242,745)
Net derivative liabilities	522,025	644,519
Fair Value, Measurements, Recurring | Level 2 | Interest rate contracts
Derivative
Derivative assets - Fair value	473,907	440,283
Derivative liabilities - Fair Value	433,936	584,516
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts
Derivative
Derivative assets - Fair value	57,072	53,109
Derivative liabilities - Fair Value	42,564	44,117
Fair Value, Measurements, Recurring | Level 2 | Credit contracts
Derivative
Derivative assets - Fair value	1
Derivative liabilities - Fair Value	25	23
Fair Value, Measurements, Recurring | Level 2 | Equity contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair Value	0
Fair Value, Measurements, Recurring | Level 2 | Commodity contracts
Derivative
Derivative assets - Fair value	79,604	261,613
Derivative liabilities - Fair Value	121,670	258,608
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 2 | U.S. government agency and U.S. government-sponsored enterprise debt securities
Debt securities available-for-sale
Fair Value	364,446	461,607
Fair Value, Measurements, Recurring | Level 2 | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Debt securities available-for-sale
Fair Value	468,259	500,269
Fair Value, Measurements, Recurring | Level 2 | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Debt securities available-for-sale
Fair Value	1,727,594	1,762,195
Fair Value, Measurements, Recurring | Level 2 | Municipal securities:
Debt securities available-for-sale
Fair Value	261,016	257,099
Fair Value, Measurements, Recurring | Level 2 | Non-agency commercial mortgage-backed Securities
Debt securities available-for-sale
Fair Value	367,516	398,329
Fair Value, Measurements, Recurring | Level 2 | Non-agency residential mortgage-backed Securities
Debt securities available-for-sale
Fair Value	553,671	649,224
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities
Debt securities available-for-sale
Fair Value	502,425	526,274
Fair Value, Measurements, Recurring | Level 2 | Foreign government bonds
Debt securities available-for-sale
Fair Value	227,874	227,053
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities
Debt securities available-for-sale
Fair Value	42,300	49,076
Fair Value, Measurements, Recurring | Level 2 | Collateralized loan obligations (“CLOs”)
Debt securities available-for-sale
Fair Value	612,861	597,664
Fair Value, Measurements, Recurring | Level 3
Debt securities available-for-sale
Fair Value	0	0
Investments in qualified affordable housing partnerships, tax credit and other investments, net:
Equity securities	0	0
Total investments in qualified affordable housing partnerships, tax credit and other investments, net	0	0
Derivative
Derivative assets - Fair value	336	323
Netting adjustments	0	0
Net derivative assets	336	323
Derivative liabilities - Fair Value	15,119	0
Netting adjustments	0	0
Net derivative liabilities	15,119	0
Fair Value, Measurements, Recurring | Level 3 | Interest rate contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Credit contracts
Derivative
Derivative assets - Fair value	0
Derivative liabilities - Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Equity contracts
Derivative
Derivative assets - Fair value	336	323
Derivative liabilities - Fair Value	15,119
Fair Value, Measurements, Recurring | Level 3 | Commodity contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | U.S. government agency and U.S. government-sponsored enterprise debt securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Municipal securities:
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Non-agency commercial mortgage-backed Securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Non-agency residential mortgage-backed Securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Foreign government bonds
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities
Debt securities available-for-sale
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Collateralized loan obligations (“CLOs”)
Debt securities available-for-sale
Fair Value	$ 0	$ 0

Fair Value Measurement and Fa_5

Fair Value Measurement and Fair Value of Financial Instruments - Reconciliation of Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Lending fees
Equity contracts
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total unrealized (losses) gains for the period included in earnings	$ (79)	$ 17	$ (44)
Fair Value, Measurements, Recurring | Level 3 | Equity contracts
Reconciliation of the beginning and ending balances for major asset categories measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Beginning balance	323	215	273
Total (losses) gains included in earnings	(79)	17	32
Issuances	92	91	12
Settlements	0	0	(96)
Transfers out of Level 3	0	0	(6)
Ending balance	336	323	215
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	0	0
Issuances	15,119	0	0
Ending balance	$ 15,119	$ 0	$ 0

Fair Value Measurement and Fa_6

Fair Value Measurement and Fair Value of Financial Instruments - Quantitative Information for Significant Unobservable Inputs (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Derivative Assets
Derivative assets - Fair value	$ 610,920	$ 755,328
Derivative Liabilities
Derivative liabilities - Fair Value	613,314	887,264
Fair Value, Measurements, Recurring
Derivative Assets
Derivative assets - Fair value	610,920	755,328
Derivative Liabilities
Derivative liabilities - Fair Value	613,314	887,264
Fair Value, Measurements, Nonrecurring
Derivative Liabilities
Loans held-for-investment, fair value disclosure	45,892	72,614
Level 3 | Fair Value, Measurements, Recurring
Derivative Assets
Derivative assets - Fair value	336	323
Derivative Liabilities
Derivative liabilities - Fair Value	15,119	0
Level 3 | Fair Value, Measurements, Nonrecurring
Derivative Liabilities
Loans held-for-investment, fair value disclosure	45,892	72,614
Level 3 | Fair Value, Measurements, Nonrecurring | Investments in qualified affordable housing partnerships, tax credit and other investments, net
Derivative Liabilities
Investments in qualified affordable housing partnerships, tax credit and other investments, net	868
Level 3 | Fair Value, Measurements, Nonrecurring | Discounted cash flows
Derivative Liabilities
Loans held-for-investment, fair value disclosure		23,322
Level 3 | Fair Value, Measurements, Nonrecurring | Fair value of collateral
Derivative Liabilities
Loans held-for-investment, fair value disclosure	16,328	17,912
Level 3 | Fair Value, Measurements, Nonrecurring | Fair value of property
Derivative Liabilities
Loans held-for-investment, fair value disclosure	$ 26,555	$ 31,380
Level 3 | Fair Value, Measurements, Nonrecurring | Selling cost | Fair value of property
Derivative Liabilities
Loans held-for-investment, measurement input	8%	8%
Level 3 | Fair Value, Measurements, Nonrecurring | Minimum | Discount | Discounted cash flows
Derivative Liabilities
Loans held-for-investment, measurement input		4%
Level 3 | Fair Value, Measurements, Nonrecurring | Minimum | Discount | Fair value of collateral
Derivative Liabilities
Loans held-for-investment, measurement input	15%	15%
Level 3 | Fair Value, Measurements, Nonrecurring | Maximum | Discount | Discounted cash flows
Derivative Liabilities
Loans held-for-investment, measurement input		6%
Level 3 | Fair Value, Measurements, Nonrecurring | Maximum | Discount | Fair value of collateral
Derivative Liabilities
Loans held-for-investment, measurement input	75%	75%
Level 3 | Fair Value, Measurements, Nonrecurring | Weighted Average | Discount | Discounted cash flows
Derivative Liabilities
Loans held-for-investment, measurement input		4%
Level 3 | Fair Value, Measurements, Nonrecurring | Weighted Average | Discount | Fair value of collateral
Derivative Liabilities
Loans held-for-investment, measurement input	45%	37%
Level 3 | Fair Value, Measurements, Nonrecurring | Weighted Average | Selling cost | Fair value of property
Derivative Liabilities
Loans held-for-investment, measurement input	8%	8%
Equity contracts | Fair Value, Measurements, Recurring
Derivative Assets
Derivative assets - Fair value	$ 336	$ 323
Derivative Liabilities
Derivative liabilities - Fair Value	15,119
Equity contracts | Level 3 | Fair Value, Measurements, Recurring
Derivative Assets
Derivative assets - Fair value	336	$ 323
Derivative Liabilities
Derivative liabilities - Fair Value	$ 15,119
Equity contracts | Level 3 | Fair Value, Measurements, Recurring | Liquidity discount
Derivative Liabilities
Measurement input	47%	47%
Equity contracts | Level 3 | Fair Value, Measurements, Recurring | Payout % designated based on operating revenue and operating EBITDA of investee
Derivative Liabilities
Measurement input	84%
Equity contracts | Level 3 | Fair Value, Measurements, Recurring | Minimum | Equity volatility | Black-Scholes option pricing model
Derivative Liabilities
Measurement input	37%	42%
Equity contracts | Level 3 | Fair Value, Measurements, Recurring | Maximum | Equity volatility | Black-Scholes option pricing model
Derivative Liabilities
Measurement input	48%	60%
Equity contracts | Level 3 | Fair Value, Measurements, Recurring | Weighted Average | Equity volatility | Black-Scholes option pricing model
Derivative Liabilities
Measurement input	45%	54%
Equity contracts | Level 3 | Fair Value, Measurements, Recurring | Weighted Average | Liquidity discount
Derivative Liabilities
Measurement input	47%	47%
Equity contracts | Level 3 | Fair Value, Measurements, Recurring | Weighted Average | Payout % designated based on operating revenue and operating EBITDA of investee
Derivative Liabilities
Measurement input	84%

Fair Value Measurement and Fa_7

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	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	$ 45,892	$ 72,614
Commercial Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	44,688	71,391
Commercial Lending | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	22,035	40,011
Commercial Lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	22,653	31,380
Consumer Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	1,204	1,223
Consumer Lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	1,204	1,223
Level 1
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	0	0
Level 1 | Investments in qualified affordable housing partnerships, tax credit and other investments, net
Fair Value, Assets Measured on a Nonrecurring Basis
Investments in qualified affordable housing partnerships, tax credit and other investments, net	0
Level 1 | Commercial Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	0	0
Level 1 | Commercial Lending | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	0	0
Level 1 | Commercial Lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	0	0
Level 1 | Consumer Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	0	0
Level 1 | Consumer Lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	0	0
Level 2
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	0	0
Level 2 | Investments in qualified affordable housing partnerships, tax credit and other investments, net
Fair Value, Assets Measured on a Nonrecurring Basis
Investments in qualified affordable housing partnerships, tax credit and other investments, net	0
Level 2 | Commercial Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	0	0
Level 2 | Commercial Lending | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	0	0
Level 2 | Commercial Lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	0	0
Level 2 | Consumer Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	0	0
Level 2 | Consumer Lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	0	0
Level 3
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	45,892	72,614
Level 3 | Valuation Technique, Fair Value Of Collateral, Contract Value
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	3,009
Level 3 | Investments in qualified affordable housing partnerships, tax credit and other investments, net
Fair Value, Assets Measured on a Nonrecurring Basis
Investments in qualified affordable housing partnerships, tax credit and other investments, net	868
Level 3 | Commercial Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	44,688	71,391
Level 3 | Commercial Lending | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	22,035	40,011
Level 3 | Commercial Lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	22,653	31,380
Level 3 | Consumer Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	1,204	1,223
Level 3 | Consumer Lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Total loans held-for-investment	$ 1,204	$ 1,223

Fair Value Measurement and Fa_8

Fair Value Measurement and Fair Value of Financial Instruments - Increase (Decrease) in Value of Assets Measured on a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	$ (7,375)	$ (32,928)	$ (19,815)
Loans held-for-investment | Commercial Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	(7,335)	(33,094)	(19,811)
Loans held-for-investment | Commercial Lending | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	(6,152)	(25,996)	(9,580)
Loans held-for-investment | Commercial Lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	(1,183)	(7,098)	(10,231)
Loans held-for-investment | Consumer Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	(40)	166	(4)
Loans held-for-investment | Consumer Lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	(40)	166	(4)
Investments in qualified affordable housing partnerships, tax credit and other investments, net
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	(1,140)	469	877
Other nonperforming assets
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in fair value of assets	$ 0	$ (6,861)	$ (4,241)

Fair Value Measurement and Fa_9

Fair Value Measurement and Fair Value of Financial Instruments - Carrying and Fair Values Estimates per the Fair Value Hierarchy of Financial Instruments on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financial assets:
Cash and cash equivalents	$ 4,614,984	$ 3,481,784
Interest-bearing deposits with banks	10,498	139,021
Resale agreements	785,000	792,192
HTM debt securities	2,956,040	3,001,868
Restricted equity securities, at cost	79,811	78,624
Loans held-for-investment, net	51,542,039	47,606,785
Financial liabilities:
Time deposits	18,043,464
Repurchase agreements	0	300,000
Carrying Amount
Financial assets:
Cash and cash equivalents	4,614,984	3,481,784
Interest-bearing deposits with banks	10,498	139,021
Resale agreements	785,000	792,192
HTM debt securities	2,956,040	3,001,868
Restricted equity securities, at cost	79,811	78,624
Loans held-for-sale	116	25,644
Loans held-for-investment, net	51,542,039	47,606,785
Mortgage servicing rights	6,602	6,235
Accrued interest receivable	331,490	263,430
Financial liabilities:
Demand, checking, savings and money market deposits	38,048,974	42,637,316
Time deposits	18,043,464	13,330,533
Short-term borrowings	4,500,000
Repurchase agreements		300,000
Long-term debt	148,249	147,950
Accrued interest payable	205,430	37,198
Estimated Fair Value
Financial assets:
Cash and cash equivalents	4,614,984	3,481,784
Interest-bearing deposits with banks	10,498	139,021
Resale agreements	699,056	693,656
HTM debt securities	2,453,971	2,455,171
Restricted equity securities, at cost	79,811	78,624
Loans held-for-sale	116	25,644
Loans held-for-investment, net	50,256,565	46,670,690
Mortgage servicing rights	9,470	10,917
Accrued interest receivable	331,490	263,430
Financial liabilities:
Demand, checking, savings and money market deposits	38,048,974	42,637,316
Time deposits	18,004,951	13,228,777
Short-term borrowings	4,500,000
Repurchase agreements		304,097
Long-term debt	150,896	143,483
Accrued interest payable	205,430	37,198
Estimated Fair Value | Level 1
Financial assets:
Cash and cash equivalents	4,614,984	3,481,784
Interest-bearing deposits with banks	0	0
Resale agreements	0	0
HTM debt securities	488,551	471,469
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
Repurchase agreements		0
Long-term debt	0	0
Accrued interest payable	0	0
Estimated Fair Value | Level 2
Financial assets:
Cash and cash equivalents	0	0
Interest-bearing deposits with banks	10,498	139,021
Resale agreements	699,056	693,656
HTM debt securities	1,965,420	1,983,702
Restricted equity securities, at cost	79,811	78,624
Loans held-for-sale	116	25,644
Loans held-for-investment, net	0	0
Mortgage servicing rights	0	0
Accrued interest receivable	331,490	263,430
Financial liabilities:
Demand, checking, savings and money market deposits	38,048,974	42,637,316
Time deposits	18,004,951	13,228,777
Short-term borrowings	4,500,000
Repurchase agreements		304,097
Long-term debt	150,896	143,483
Accrued interest payable	205,430	37,198
Estimated Fair Value | Level 3
Financial assets:
Cash and cash equivalents	0	0
Interest-bearing deposits with banks	0	0
Resale agreements	0	0
HTM debt securities	0	0
Restricted equity securities, at cost	0	0
Loans held-for-sale	0	0
Loans held-for-investment, net	50,256,565	46,670,690
Mortgage servicing rights	9,470	10,917
Accrued interest receivable	0	0
Financial liabilities:
Demand, checking, savings and money market deposits	0	0
Time deposits	0	0
Short-term borrowings	0
Repurchase agreements		0
Long-term debt	0	0
Accrued interest payable	$ 0	$ 0

Assets Purchased under Resale_3

Assets Purchased under Resale Agreements and Sold under Repurchase Agreements - Resale Agreements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Offsetting Assets [Line Items]
Gross resale agreements	$ 785,000,000	$ 760,000,000
Average yield	2.87%	2.12%	1.53%
Loans purchased under agreements to resell	$ 0	$ 32,000,000
Loans Purchased Under Resale Agreements
Offsetting Assets [Line Items]
Weighted average yield (as a percent)		2.16%	1.53%

Assets Purchased under Resale_4

Assets Purchased under Resale Agreements and Sold under Repurchase Agreements - Repurchase Agreements (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amount of securities sold under repurchase agreements
Gross repurchase agreements		$ 0	$ 300,000,000
Extinguishment of repurchase agreements	$ 300,000,000
Repurchase agreements’ extinguishment cost		$ 4,000,000	$ 0	$ 0
Securities sold under agreements to repurchase average rate paid			3.07%	2.61%

Assets Purchased under Resale_5

Assets Purchased under Resale Agreements and Sold under Repurchase Agreements - Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets, Resale Agreements
Gross Amounts of Recognized Assets	$ 785,000	$ 792,192
Gross Amounts Offset on the Consolidated Balance Sheet	0	0
Net Amounts of Assets Presented on the Consolidated Balance Sheet	785,000	792,192
Gross Amounts Not Offset on the Consolidated Balance Sheet
Collateral Received	(715,358)	(701,790)
Net Amount	69,642	90,402
Liabilities, Repurchase Agreements
Gross Amounts of Recognized Liabilities	0	300,000
Gross Amounts Offset on the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented on the Consolidated Balance Sheet	0	300,000
Gross Amounts Not Offset on the Consolidated Balance Sheet
Collateral Pledged	0	(300,000)
Net Amount	$ 0	$ 0

Securities - Schedule of Availa

Securities - Schedule of Available-for-sale and Held-to-maturity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
AFS debt securities:
Amortized Cost	$ 6,916,491	$ 6,879,225
Gross Unrealized Gains	783	498
Gross Unrealized Losses	(728,937)	(844,730)
Fair Value	6,188,337	6,034,993
HTM debt securities
Amortized Cost	2,956,040	3,001,868
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(502,069)	(546,697)
Fair Value	2,453,971	2,455,171
Total debt securities
Amortized Cost	9,872,531	9,881,093
Gross Unrealized Gains	783	498
Gross Unrealized Losses	(1,231,006)	(1,391,427)
Fair Value	8,642,308	8,490,164
U.S. Treasury securities
AFS debt securities:
Amortized Cost	1,112,587	676,306
Gross Unrealized Gains	101	0
Gross Unrealized Losses	(52,313)	(70,103)
Fair Value	1,060,375	606,203
HTM debt securities
Amortized Cost	529,548	524,081
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(40,997)	(52,612)
Fair Value	488,551	471,469
U.S. government agency and U.S. government-sponsored enterprise debt securities
AFS debt securities:
Amortized Cost	412,086	517,806
Gross Unrealized Gains	0	67
Gross Unrealized Losses	(47,640)	(56,266)
Fair Value	364,446	461,607
HTM debt securities
Amortized Cost	1,001,836	998,972
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(186,904)	(209,560)
Fair Value	814,932	789,412
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
AFS debt securities:
Amortized Cost	531,377	577,392
Gross Unrealized Gains	158	0
Gross Unrealized Losses	(63,276)	(77,123)
Fair Value	468,259	500,269
HTM debt securities
Amortized Cost	493,348	506,965
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(88,968)	(98,566)
Fair Value	404,380	408,399
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
AFS debt securities:
Amortized Cost	1,956,927	2,011,054
Gross Unrealized Gains	380	41
Gross Unrealized Losses	(229,713)	(248,900)
Fair Value	1,727,594	1,762,195
HTM debt securities
Amortized Cost	742,436	782,141
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(142,119)	(148,230)
Fair Value	600,317	633,911
Municipal securities:
AFS debt securities:
Amortized Cost	297,283	303,884
Gross Unrealized Gains	75	3
Gross Unrealized Losses	(36,342)	(46,788)
Fair Value	261,016	257,099
HTM debt securities
Amortized Cost	188,872	189,709
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(43,081)	(37,729)
Fair Value	145,791	151,980
Non-agency commercial mortgage-backed Securities
AFS debt securities:
Amortized Cost	409,578	447,512
Gross Unrealized Gains	0	213
Gross Unrealized Losses	(42,062)	(49,396)
Fair Value	367,516	398,329
Non-agency residential mortgage-backed Securities
AFS debt securities:
Amortized Cost	643,335	762,202
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(89,664)	(112,978)
Fair Value	553,671	649,224
Corporate debt securities
AFS debt securities:
Amortized Cost	653,501	673,502
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(151,076)	(147,228)
Fair Value	502,425	526,274
Foreign government bonds
AFS debt securities:
Amortized Cost	239,333	241,165
Gross Unrealized Gains	69	174
Gross Unrealized Losses	(11,528)	(14,286)
Fair Value	227,874	227,053
Asset-backed securities
AFS debt securities:
Amortized Cost	43,234	51,152
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(934)	(2,076)
Fair Value	42,300	49,076
CLOs
AFS debt securities:
Amortized Cost	617,250	617,250
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4,389)	(19,586)
Fair Value	$ 612,861	$ 597,664

Securities - Narrative (Details

Securities - Narrative (Details)	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
AFS and HTM, accrued interest | $	$ 44,000,000	$ 42,000,000
Number of available-for-sale debt securities in an unrealized loss position | security	547	559
Allowance for credit loss | $	$ 0	$ 0
HTM securities allowance for credit loss | $	0	0
Asset Pledged as Collateral
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost | $	$ 7,000,000,000	$ 794,000,000
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Number of available-for-sale debt securities in an unrealized loss position | security	255	263
Non-agency mortgage-backed securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Number of available-for-sale debt securities in an unrealized loss position | security	99	100
Corporate debt securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Number of available-for-sale debt securities in an unrealized loss position | security	66	68

Securities - Continuous Unreali

Securities - Continuous Unrealized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities, Less than 12 Months, Fair Value	$ 125,924	$ 1,451,466
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(721)	(104,682)
Available-for-sale debt securities, More than 12 Months, Fair Value	5,532,528	4,332,275
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months	(728,216)	(740,048)
Available-for-sale debt securities, Fair Value, Total	5,658,452	5,783,741
Available-for-sale debt securities, Gross Unrealized Loss, Total	(728,937)	(844,730)
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	131,843
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(8,761)
Available-for-sale debt securities, More than 12 Months, Fair Value	623,978	474,360
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months	(52,313)	(61,342)
Available-for-sale debt securities, Fair Value, Total	623,978	606,203
Available-for-sale debt securities, Gross Unrealized Loss, Total	(52,313)	(70,103)
U.S. government agency and U.S. government-sponsored enterprise debt securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	97,403
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(6,902)
Available-for-sale debt securities, More than 12 Months, Fair Value	364,446	214,136
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months	(47,640)	(49,364)
Available-for-sale debt securities, Fair Value, Total	364,446	311,539
Available-for-sale debt securities, Gross Unrealized Loss, Total	(47,640)	(56,266)
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	252,144
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(30,029)
Available-for-sale debt securities, More than 12 Months, Fair Value	463,572	248,125
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months	(63,276)	(47,094)
Available-for-sale debt securities, Fair Value, Total	463,572	500,269
Available-for-sale debt securities, Gross Unrealized Loss, Total	(63,276)	(77,123)
US government agencies And U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities, Less than 12 Months, Fair Value	9,402	307,536
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(558)	(20,346)
Available-for-sale debt securities, More than 12 Months, Fair Value	1,661,112	1,448,658
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months	(229,155)	(228,554)
Available-for-sale debt securities, Fair Value, Total	1,670,514	1,756,194
Available-for-sale debt securities, Gross Unrealized Loss, Total	(229,713)	(248,900)
Municipal securities:
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities, Less than 12 Months, Fair Value	2,825	95,655
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(15)	(10,194)
Available-for-sale debt securities, More than 12 Months, Fair Value	254,773	159,439
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months	(36,327)	(36,594)
Available-for-sale debt securities, Fair Value, Total	257,598	255,094
Available-for-sale debt securities, Gross Unrealized Loss, Total	(36,342)	(46,788)
Non-agency commercial mortgage-backed Securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities, Less than 12 Months, Fair Value	2,742	106,184
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(4)	(3,309)
Available-for-sale debt securities, More than 12 Months, Fair Value	364,774	282,301
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months	(42,058)	(46,087)
Available-for-sale debt securities, Fair Value, Total	367,516	388,485
Available-for-sale debt securities, Gross Unrealized Loss, Total	(42,062)	(49,396)
Non-agency residential mortgage-backed Securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	22,715
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(1,546)
Available-for-sale debt securities, More than 12 Months, Fair Value	553,671	626,509
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months	(89,664)	(111,432)
Available-for-sale debt securities, Fair Value, Total	553,671	649,224
Available-for-sale debt securities, Gross Unrealized Loss, Total	(89,664)	(112,978)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	173,595
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(17,907)
Available-for-sale debt securities, More than 12 Months, Fair Value	502,425	352,679
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months	(151,076)	(129,321)
Available-for-sale debt securities, Fair Value, Total	502,425	526,274
Available-for-sale debt securities, Gross Unrealized Loss, Total	(151,076)	(147,228)
Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities, Less than 12 Months, Fair Value	110,955	107,576
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(144)	(429)
Available-for-sale debt securities, More than 12 Months, Fair Value	88,616	36,143
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months	(11,384)	(13,857)
Available-for-sale debt securities, Fair Value, Total	199,571	143,719
Available-for-sale debt securities, Gross Unrealized Loss, Total	(11,528)	(14,286)
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	12,450
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(524)
Available-for-sale debt securities, More than 12 Months, Fair Value	42,300	36,626
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months	(934)	(1,552)
Available-for-sale debt securities, Fair Value, Total	42,300	49,076
Available-for-sale debt securities, Gross Unrealized Loss, Total	(934)	(2,076)
Collateralized loan obligations (“CLOs”)
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	144,365
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	(4,735)
Available-for-sale debt securities, More than 12 Months, Fair Value	612,861	453,299
Available-for-sale debt securities, Gross Unrealized Loss, More than 12 Months	(4,389)	(14,851)
Available-for-sale debt securities, Fair Value, Total	612,861	597,664
Available-for-sale debt securities, Gross Unrealized Loss, Total	$ (4,389)	$ (19,586)

Securities - Realized Gains and

Securities - Realized Gains and Losses in Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Gross realized gains from sales	$ 3,138	$ 1,306	$ 1,568
Impairment write-off	(10,000)	0	0
Related tax (benefit) expense	(2,029)	$ 386	$ 464
Available-for-sale, realized loss	7,000
Available-for-sale, impairment write-off on subordinated debt	$ (10,000)

Securities - Composition of Int

Securities - Composition of Interest Income on Debt Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Taxable interest	$ 255,475	$ 179,720	$ 131,985
Nontaxable interest	20,715	19,186	11,998
Total interest income on debt securities	$ 276,190	$ 198,906	$ 143,983

Securities - Scheduled Contract

Securities - Scheduled Contractual Maturities of ATM and HTM Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized cost
Within One Year	$ 618,788
After One Year through Five Years	1,032,511
After Five Years through Ten Years	998,302
After Ten Years	4,266,890
Amortized Cost	6,916,491	$ 6,879,225
Fair value
Within One Year	617,580
After One Year through Five Years	970,877
After Five Years through Ten Years	904,294
After Ten Years	3,695,586
Total	$ 6,188,337
Weighted-Average Yield
Within One Year	5.44%
After One Year through Five Years	1.84%
After Five Years through Ten Years	4.27%
After Ten Years	3.42%
Total	3.49%
Amortized cost
Within One Year	$ 0
After One Year through Five Years	529,548
After Five Years through Ten Years	442,792
After Ten Years	1,983,700
Total	2,956,040
Fair value
Within One Year	0
After One Year through Five Years	488,551
After Five Years through Ten Years	380,447
After Ten Years	1,584,973
Total	$ 2,453,971
Weighted Average Yield
Within One Year	0%
After One Year through Five Years	1.05%
After Five Years through Ten Years	1.83%
After Ten Years	1.79%
Total	1.66%
U.S. Treasury securities
Amortized cost
Within One Year	$ 436,296
After One Year through Five Years	676,291
After Five Years through Ten Years	0
After Ten Years	0
Amortized Cost	1,112,587	676,306
Fair value
Within One Year	436,397
After One Year through Five Years	623,978
After Five Years through Ten Years	0
After Ten Years	0
Total	$ 1,060,375
Weighted-Average Yield
Within One Year	5.40%
After One Year through Five Years	1.20%
After Five Years through Ten Years	0%
After Ten Years	0%
Total	2.85%
Amortized cost
Within One Year	$ 0
After One Year through Five Years	529,548
After Five Years through Ten Years	0
After Ten Years	0
Total	529,548
Fair value
Within One Year	0
After One Year through Five Years	488,551
After Five Years through Ten Years	0
After Ten Years	0
Total	$ 488,551
Weighted Average Yield
Within One Year	0%
After One Year through Five Years	1.05%
After Five Years through Ten Years	0%
After Ten Years	0%
Total	1.05%
U.S. government agency and U.S. government-sponsored enterprise debt securities
Amortized cost
Within One Year	$ 50,000
After One Year through Five Years	96,470
After Five Years through Ten Years	128,169
After Ten Years	137,447
Amortized Cost	412,086	517,806
Fair value
Within One Year	49,882
After One Year through Five Years	93,182
After Five Years through Ten Years	109,134
After Ten Years	112,248
Total	$ 364,446
Weighted-Average Yield
Within One Year	5%
After One Year through Five Years	3.08%
After Five Years through Ten Years	1.38%
After Ten Years	2.33%
Total	2.53%
Amortized cost
Within One Year	$ 0
After One Year through Five Years	0
After Five Years through Ten Years	343,319
After Ten Years	658,517
Total	1,001,836
Fair value
Within One Year	0
After One Year through Five Years	0
After Five Years through Ten Years	296,124
After Ten Years	518,808
Total	$ 814,932
Weighted Average Yield
Within One Year	0%
After One Year through Five Years	0%
After Five Years through Ten Years	1.90%
After Ten Years	1.89%
Total	1.90%
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities
Amortized cost
Within One Year	$ 0
After One Year through Five Years	41,533
After Five Years through Ten Years	142,008
After Ten Years	2,304,763
Amortized Cost	2,488,304
Fair value
Within One Year	0
After One Year through Five Years	39,930
After Five Years through Ten Years	130,528
After Ten Years	2,025,395
Total	$ 2,195,853
Weighted-Average Yield
Within One Year	0%
After One Year through Five Years	3.13%
After Five Years through Ten Years	2.70%
After Ten Years	3.68%
Total	3.62%
Amortized cost
Within One Year	$ 0
After One Year through Five Years	0
After Five Years through Ten Years	99,473
After Ten Years	1,136,311
Total	1,235,784
Fair value
Within One Year	0
After One Year through Five Years	0
After Five Years through Ten Years	84,323
After Ten Years	920,374
Total	$ 1,004,697
Weighted Average Yield
Within One Year	0%
After One Year through Five Years	0%
After Five Years through Ten Years	1.61%
After Ten Years	1.70%
Total	1.69%
Municipal securities:
Amortized cost
Within One Year	$ 2,240
After One Year through Five Years	35,100
After Five Years through Ten Years	9,624
After Ten Years	250,319
Amortized Cost	297,283	303,884
Fair value
Within One Year	2,214
After One Year through Five Years	32,877
After Five Years through Ten Years	8,752
After Ten Years	217,173
Total	$ 261,016
Weighted-Average Yield
Within One Year	3.39%
After One Year through Five Years	2.24%
After Five Years through Ten Years	3.22%
After Ten Years	2.23%
Total	2.27%
Amortized cost
Within One Year	$ 0
After One Year through Five Years	0
After Five Years through Ten Years	0
After Ten Years	188,872
Total	188,872
Fair value
Within One Year	0
After One Year through Five Years	0
After Five Years through Ten Years	0
After Ten Years	145,791
Total	$ 145,791
Weighted Average Yield
Within One Year	0%
After One Year through Five Years	0%
After Five Years through Ten Years	0%
After Ten Years	1.99%
Total	1.99%
Non-agency mortgage-backed securities
Amortized cost
Within One Year	$ 96,990
After One Year through Five Years	77,046
After Five Years through Ten Years	0
After Ten Years	878,877
Amortized Cost	1,052,913
Fair value
Within One Year	95,856
After One Year through Five Years	74,884
After Five Years through Ten Years	0
After Ten Years	750,447
Total	$ 921,187
Weighted-Average Yield
Within One Year	6.74%
After One Year through Five Years	4.44%
After Five Years through Ten Years	0%
After Ten Years	2.59%
Total	3.11%
Corporate debt securities
Amortized cost
Within One Year	$ 0
After One Year through Five Years	0
After Five Years through Ten Years	349,501
After Ten Years	304,000
Amortized Cost	653,501	673,502
Fair value
Within One Year	0
After One Year through Five Years	0
After Five Years through Ten Years	290,877
After Ten Years	211,548
Total	$ 502,425
Weighted-Average Yield
Within One Year	0%
After One Year through Five Years	0%
After Five Years through Ten Years	3.48%
After Ten Years	1.97%
Total	2.78%
Foreign government bonds
Amortized cost
Within One Year	$ 33,262
After One Year through Five Years	106,071
After Five Years through Ten Years	50,000
After Ten Years	50,000
Amortized Cost	239,333	241,165
Fair value
Within One Year	33,231
After One Year through Five Years	106,026
After Five Years through Ten Years	49,593
After Ten Years	39,024
Total	$ 227,874
Weighted-Average Yield
Within One Year	3.02%
After One Year through Five Years	2.28%
After Five Years through Ten Years	5.73%
After Ten Years	1.50%
Total	2.94%
Asset-backed securities
Amortized cost
Within One Year	$ 0
After One Year through Five Years	0
After Five Years through Ten Years	0
After Ten Years	43,234
Amortized Cost	43,234	51,152
Fair value
Within One Year	0
After One Year through Five Years	0
After Five Years through Ten Years	0
After Ten Years	42,300
Total	$ 42,300
Weighted-Average Yield
Within One Year	0%
After One Year through Five Years	0%
After Five Years through Ten Years	0%
After Ten Years	6.07%
Total	6.07%
Collateralized loan obligations (“CLOs”)
Amortized cost
Within One Year	$ 0
After One Year through Five Years	0
After Five Years through Ten Years	319,000
After Ten Years	298,250
Amortized Cost	617,250	$ 617,250
Fair value
Within One Year	0
After One Year through Five Years	0
After Five Years through Ten Years	315,410
After Ten Years	297,451
Total	$ 612,861
Weighted-Average Yield
Within One Year	0%
After One Year through Five Years	0%
After Five Years through Ten Years	6.80%
After Ten Years	6.82%
Total	6.81%

Securities - Restricted Equity

Securities - Restricted Equity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
FRBSF stock	$ 62,561	$ 61,374
FHLB stock	17,250	17,250
Total restricted equity securities	$ 79,811	$ 78,624

Derivatives - Narrative (Detail

Derivatives - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) Contract	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Derivative assets - Fair value	$ 610,920,000	$ 755,328,000
Derivative liabilities - Fair Value	613,314,000	887,264,000
Derivatives not designated as hedging instruments:
Derivative [Line Items]
Derivative assets - Fair value	557,105,000	736,283,000
Derivative liabilities - Fair Value	600,190,000	867,577,000
Notional amount	23,333,449,000	20,056,255,000
Derivative instruments designated as hedging instruments
Derivative [Line Items]
Derivative assets - Fair value	53,815,000	19,045,000
Derivative liabilities - Fair Value	13,124,000	19,687,000
Notional amount	5,331,480,000	3,534,832,000
Interest rate contracts | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Derivative assets - Fair value	423,486,000	426,828,000
Derivative liabilities - Fair Value	420,812,000	564,829,000
Notional amount	17,387,909,000	16,932,414,000
Interest rate contracts | Derivatives not designated as hedging instruments: | London Clearing House
Derivative [Line Items]
Derivative assets - Fair value	43,000,000	167,000,000
Derivative liabilities - Fair Value	43,000,000	81,000,000
Interest rate contracts | Cash Flow Hedging | Derivative instruments designated as hedging instruments
Derivative [Line Items]
Derivative assets - Fair value	50,421,000	13,455,000
Derivative liabilities - Fair Value	13,124,000	19,687,000
Notional amount	5,250,000,000	3,450,000,000
Net unrealized losses, net of tax, recorded in AOCI expected to be reclassified into earnings during the next 12 months	47,000,000
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Derivative assets - Fair value	53,678,000	47,519,000
Derivative liabilities - Fair Value	42,564,000	44,117,000
Notional amount	$ 5,827,149,000	$ 2,982,891,000
Foreign exchange contracts | Derivatives not designated as hedging instruments: | Maximum
Derivative [Line Items]
Original maturity (in years)	1 year	1 year
Credit Risk Contract | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Derivative assets - Fair value	$ 1,000	$ 0
Derivative liabilities - Fair Value	25,000	23,000
Notional amount	118,391,000	140,950,000
Credit Risk Contract | Derivatives not designated as hedging instruments: | RPAs - protection sold
Derivative [Line Items]
Notional amount	$ 25,000,000	$ 0
Number of instruments held | Contract	1
Credit Risk Contract | Derivatives not designated as hedging instruments: | RPAs - protection purchased
Derivative [Line Items]
Weighted average remaining maturity of outstanding RPAs	2 years 9 months 18 days	2 years 4 months 24 days
Maximum exposure of RPAs with protection sold	$ 177,000	$ 0
Credit-Risk-Related Contingent Features
Derivative [Line Items]
Aggregate fair value of derivative instruments in net liability position	9,000	3,000,000
Associated posted collateral	0	$ 1,000,000
Commercial Banking | Interest rate contracts | Cash Flow Hedging | Derivative instruments designated as hedging instruments
Derivative [Line Items]
Notional amount	$ 5,300,000,000

Derivatives - Notional and Fair

Derivatives - Notional and Fair Values (Details) MMBTU in Thousands, Boe in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Boe MMBTU company shares	Dec. 31, 2022 USD ($) Boe MMBTU company
Derivative Assets
Derivative assets - Fair value	$ 610,920,000	$ 755,328,000
Less: Master Netting Arrangements	(75,534,000)	(242,745,000)
Less: Cash collateral received or paid	(237,258,000)	(372,038,000)
Derivative asset, after netting	298,128,000	140,545,000
Derivative Liabilities
Derivative liabilities - Fair Value	613,314,000	887,264,000
Less: Master Netting Arrangements	(75,534,000)	(242,745,000)
Less: Cash collateral received/paid	(636,000)	0
Derivative liability, after netting	$ 537,144,000	$ 644,519,000
Rayliant Global Advisors Limited | Performance-Based RSUs
Derivative Liabilities
Derivative liability granted number of shares | shares	349,138
Crude Oil
Derivative Liabilities
Derivative, nonmonetary notional amount, energy measure | Boe	18,631	12,005
Natural Gas
Derivative Liabilities
Derivative, nonmonetary notional amount, energy measure | MMBTU	328,844	247,704
Derivative instruments designated as hedging instruments
Derivative Instruments
Notional Amount	$ 5,331,480,000	$ 3,534,832,000
Derivative Assets
Derivative assets - Fair value	53,815,000	19,045,000
Derivative Liabilities
Derivative liabilities - Fair Value	13,124,000	19,687,000
Derivatives not designated as hedging instruments:
Derivative Instruments
Notional Amount	23,333,449,000	20,056,255,000
Derivative Assets
Derivative assets - Fair value	557,105,000	736,283,000
Derivative Liabilities
Derivative liabilities - Fair Value	600,190,000	867,577,000
Interest rate contracts | Derivatives not designated as hedging instruments:
Derivative Instruments
Notional Amount	17,387,909,000	16,932,414,000
Derivative Assets
Derivative assets - Fair value	423,486,000	426,828,000
Derivative Liabilities
Derivative liabilities - Fair Value	420,812,000	564,829,000
Interest rate contracts | Cash Flow Hedging | Derivative instruments designated as hedging instruments
Derivative Instruments
Notional Amount	5,250,000,000	3,450,000,000
Derivative Assets
Derivative assets - Fair value	50,421,000	13,455,000
Derivative Liabilities
Derivative liabilities - Fair Value	13,124,000	19,687,000
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivative Instruments
Notional Amount	5,827,149,000	2,982,891,000
Derivative Assets
Derivative assets - Fair value	53,678,000	47,519,000
Derivative Liabilities
Derivative liabilities - Fair Value	42,564,000	44,117,000
Foreign exchange contracts | Net investment hedges | Derivative instruments designated as hedging instruments
Derivative Instruments
Notional Amount	81,480,000	84,832,000
Derivative Assets
Derivative assets - Fair value	3,394,000	5,590,000
Derivative Liabilities
Derivative liabilities - Fair Value	0	0
Commodity contracts | Derivatives not designated as hedging instruments:
Derivative Instruments
Notional Amount	0	0
Derivative Assets
Derivative assets - Fair value	79,604,000	261,613,000
Derivative Liabilities
Derivative liabilities - Fair Value	121,670,000	258,608,000
Credit Risk Contract | Derivatives not designated as hedging instruments:
Derivative Instruments
Notional Amount	118,391,000	140,950,000
Derivative Assets
Derivative assets - Fair value	1,000	0
Derivative Liabilities
Derivative liabilities - Fair Value	25,000	23,000
Equity contracts | Derivatives not designated as hedging instruments:
Derivative Instruments
Notional Amount	0	0
Derivative Assets
Derivative assets - Fair value	336,000	323,000
Derivative Liabilities
Derivative liabilities - Fair Value	$ 15,119,000	$ 0
Equity, Public Companies | Derivatives not designated as hedging instruments:
Derivative Liabilities
Number of companies that Issued the equity contracts (Issuers Portion Only) | company	1	1
Equity, Private Companies | Derivatives not designated as hedging instruments:
Derivative Liabilities
Number of companies that Issued the equity contracts (Issuers Portion Only) | company	11	13

Derivatives - Gains (Losses) in

Derivatives - Gains (Losses) in Cash Flow Hedge and Net Investment Hedge (Details) - Derivative instruments designated as hedging instruments - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flow Hedging | Interest rate contracts
Derivative [Line Items]
(Losses) gains recognized in AOCI: Interest rate contracts	$ (5,767)	$ (74,069)	$ 1,210
Gains (losses) reclassified from AOCI into earnings:	(79,843)	(4,004)	(868)
Cash Flow Hedging | Interest rate contracts | Interest and dividend income (for cash flow hedges on loans)
Derivative [Line Items]
Gains (losses) reclassified from AOCI into earnings:	(82,153)	(7,204)	0
Cash Flow Hedging | Interest rate contracts | Interest Expense
Derivative [Line Items]
Gains (losses) reclassified from AOCI into earnings:	696	3,200	(868)
Cash Flow Hedging | Interest rate contracts | Noninterest Income
Derivative [Line Items]
Gains (losses) reclassified from AOCI into earnings:	1,614	0	0
Net investment hedges | Foreign exchange contracts
Derivative [Line Items]
Gains (losses) recognized in AOCI	$ 2,571	$ 4,509	$ (4,558)

Derivatives - Derivatives Not D

Derivatives - Derivatives Not Designated as Hedging Instruments (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Boe MMBTU	Dec. 31, 2022 USD ($) MMBTU Boe
Derivative [Line Items]
Derivative assets - Fair value	$ 610,920	$ 755,328
Derivative liabilities - Fair Value	$ 613,314	$ 887,264
Crude Oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	18,631	12,005
Natural Gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	328,844	247,704
Customer-related positions:
Derivative [Line Items]
Notional amount	$ 11,362,194	$ 10,158,784
Derivative assets - Fair value	43,195	27,146
Derivative liabilities - Fair Value	419,499	592,060
Other economic hedges:
Derivative [Line Items]
Notional amount	11,852,864	9,756,521
Derivative assets - Fair value	433,969	447,201
Derivative liabilities - Fair Value	43,877	16,886
Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional amount	23,333,449	20,056,255
Derivative assets - Fair value	557,105	736,283
Derivative liabilities - Fair Value	600,190	867,577
Interest rate contracts | Customer-related positions:
Derivative [Line Items]
Notional amount	8,681,085	8,420,422
Derivative assets - Fair value	26,089	1,438
Derivative liabilities - Fair Value	394,625	561,547
Interest rate contracts | Other economic hedges:
Derivative [Line Items]
Notional amount	8,706,824	8,511,992
Derivative assets - Fair value	397,397	425,390
Derivative liabilities - Fair Value	26,187	3,282
Interest rate contracts | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional amount	17,387,909	16,932,414
Derivative assets - Fair value	423,486	426,828
Derivative liabilities - Fair Value	420,812	564,829
Interest rate contracts | Swaps | Customer-related positions:
Derivative [Line Items]
Notional amount	6,835,822	6,656,491
Derivative assets - Fair value	25,649	1,438
Derivative liabilities - Fair Value	377,388	521,719
Interest rate contracts | Swaps | Other economic hedges:
Derivative [Line Items]
Notional amount	6,861,561	6,683,828
Derivative assets - Fair value	380,123	384,201
Derivative liabilities - Fair Value	25,731	2,047
Interest rate contracts | Written options | Customer-related positions:
Derivative [Line Items]
Notional amount	1,522,531	1,548,158
Derivative assets - Fair value	0	0
Derivative liabilities - Fair Value	12,756	30,904
Interest rate contracts | Written options | Other economic hedges:
Derivative [Line Items]
Notional amount	0	32,117
Derivative assets - Fair value	0	0
Derivative liabilities - Fair Value	0	1,235
Interest rate contracts | Collars and corridors | Customer-related positions:
Derivative [Line Items]
Notional amount	322,732	215,773
Derivative assets - Fair value	440	0
Derivative liabilities - Fair Value	4,481	8,924
Interest rate contracts | Collars and corridors | Other economic hedges:
Derivative [Line Items]
Notional amount	322,732	215,772
Derivative assets - Fair value	4,491	8,956
Derivative liabilities - Fair Value	456	0
Interest rate contracts | Purchased options | Other economic hedges:
Derivative [Line Items]
Notional amount	1,522,531	1,580,275
Derivative assets - Fair value	12,783	32,233
Derivative liabilities - Fair Value	0	0
Commodity contracts | Customer-related positions:
Derivative [Line Items]
Derivative assets - Fair value	6,014	171,082
Derivative liabilities - Fair Value	114,974	100,333
Commodity contracts | Customer-related positions: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	5,555	56,551
Derivative liabilities - Fair Value	$ 20,548	$ 8,808
Derivative, nonmonetary notional amount, energy measure | Boe	9,243	5,476
Commodity contracts | Customer-related positions: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 459	$ 114,531
Derivative liabilities - Fair Value	$ 94,426	$ 91,525
Derivative, nonmonetary notional amount, energy measure | MMBTU	166,053	124,662
Commodity contracts | Other economic hedges:
Derivative [Line Items]
Derivative assets - Fair value	$ 73,590	$ 90,531
Derivative liabilities - Fair Value	6,696	158,275
Commodity contracts | Other economic hedges: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	10,851	8,313
Derivative liabilities - Fair Value	$ 6,391	$ 49,432
Derivative, nonmonetary notional amount, energy measure | Boe	9,388	6,529
Commodity contracts | Other economic hedges: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 62,739	$ 82,218
Derivative liabilities - Fair Value	$ 305	$ 108,843
Derivative, nonmonetary notional amount, energy measure | MMBTU	162,791	123,042
Commodity contracts | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional amount	$ 0	$ 0
Derivative assets - Fair value	79,604	261,613
Derivative liabilities - Fair Value	121,670	258,608
Commodity contracts | Swaps | Customer-related positions: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	3,735	39,955
Derivative liabilities - Fair Value	$ 15,445	$ 6,178
Derivative, nonmonetary notional amount, energy measure | Boe	3,277	2,465
Commodity contracts | Swaps | Customer-related positions: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 438	$ 112,314
Derivative liabilities - Fair Value	$ 73,793	$ 73,208
Derivative, nonmonetary notional amount, energy measure | MMBTU	118,325	92,590
Commodity contracts | Swaps | Other economic hedges: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	$ 9,166	$ 6,935
Derivative liabilities - Fair Value	$ 4,924	$ 36,060
Derivative, nonmonetary notional amount, energy measure | Boe	3,422	2,587
Commodity contracts | Swaps | Other economic hedges: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 49,941	$ 69,767
Derivative liabilities - Fair Value	$ 305	$ 106,883
Derivative, nonmonetary notional amount, energy measure | MMBTU	116,463	91,900
Commodity contracts | Collars | Customer-related positions: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	$ 1,820	$ 16,038
Derivative liabilities - Fair Value	$ 5,103	$ 2,630
Derivative, nonmonetary notional amount, energy measure | Boe	5,966	3,011
Commodity contracts | Collars | Customer-related positions: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 21	$ 2,217
Derivative liabilities - Fair Value	$ 20,400	$ 18,317
Derivative, nonmonetary notional amount, energy measure | MMBTU	45,854	32,072
Commodity contracts | Collars | Other economic hedges: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	$ 1,685	$ 1,378
Derivative liabilities - Fair Value	$ 1,467	$ 12,856
Derivative, nonmonetary notional amount, energy measure | Boe	5,966	3,942
Commodity contracts | Collars | Other economic hedges: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 12,565	$ 12,451
Derivative liabilities - Fair Value	$ 0	$ 1,960
Derivative, nonmonetary notional amount, energy measure | MMBTU	44,454	31,142
Commodity contracts | Written options | Customer-related positions: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	$ 0	$ 558
Derivative liabilities - Fair Value	$ 0	$ 0
Derivative, nonmonetary notional amount, energy measure | Boe	0	0
Commodity contracts | Written options | Customer-related positions: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 0	$ 0
Derivative liabilities - Fair Value	$ 233	$ 0
Derivative, nonmonetary notional amount, energy measure | MMBTU	1,874	0
Commodity contracts | Purchased options | Other economic hedges: | Crude Oil
Derivative [Line Items]
Derivative assets - Fair value	$ 0	$ 0
Derivative liabilities - Fair Value	$ 0	$ 516
Derivative, nonmonetary notional amount, energy measure | Boe	0	0
Commodity contracts | Purchased options | Other economic hedges: | Natural Gas
Derivative [Line Items]
Derivative assets - Fair value	$ 233	$ 0
Derivative liabilities - Fair Value	$ 0	$ 0
Derivative, nonmonetary notional amount, energy measure | MMBTU	1,874	0
Foreign exchange contracts | Customer-related positions:
Derivative [Line Items]
Notional amount	$ 2,681,109	$ 1,738,362
Derivative assets - Fair value	17,106	25,708
Derivative liabilities - Fair Value	24,874	30,513
Foreign exchange contracts | Other economic hedges:
Derivative [Line Items]
Notional amount	3,146,040	1,244,529
Derivative assets - Fair value	36,572	21,811
Derivative liabilities - Fair Value	17,690	13,604
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional amount	5,827,149	2,982,891
Derivative assets - Fair value	53,678	47,519
Derivative liabilities - Fair Value	42,564	44,117
Foreign exchange contracts | Swaps | Customer-related positions:
Derivative [Line Items]
Notional amount	1,588,491	623,143
Derivative assets - Fair value	5,801	6,629
Derivative liabilities - Fair Value	18,118	12,178
Foreign exchange contracts | Swaps | Other economic hedges:
Derivative [Line Items]
Notional amount	2,862,037	1,044,900
Derivative assets - Fair value	36,280	18,516
Derivative liabilities - Fair Value	15,757	11,447
Foreign exchange contracts | Forwards and spot | Customer-related positions:
Derivative [Line Items]
Notional amount	956,618	993,588
Derivative assets - Fair value	9,466	17,009
Derivative liabilities - Fair Value	6,756	18,090
Foreign exchange contracts | Forwards and spot | Other economic hedges:
Derivative [Line Items]
Notional amount	148,003	77,998
Derivative assets - Fair value	292	3,050
Derivative liabilities - Fair Value	94	87
Foreign exchange contracts | Other | Customer-related positions:
Derivative [Line Items]
Notional amount	136,000	121,631
Derivative assets - Fair value	1,839	2,070
Derivative liabilities - Fair Value	0	245
Foreign exchange contracts | Other | Other economic hedges:
Derivative [Line Items]
Notional amount	136,000	121,631
Derivative assets - Fair value	0	245
Derivative liabilities - Fair Value	1,839	2,070
Credit Risk Contract | Derivatives not designated as hedging instruments:
Derivative [Line Items]
Notional amount	118,391	140,950
Derivative assets - Fair value	1	0
Derivative liabilities - Fair Value	25	23
Credit Risk Contract | Derivatives not designated as hedging instruments: | RPAs - protection sold
Derivative [Line Items]
Notional amount	$ 25,000	$ 0

Derivatives - Net Gains (Losses

Derivatives - Net Gains (Losses) on Derivatives Not Designated as Hedging Instrument (Details) - Derivatives not designated as hedging instruments: - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	$ 49,815	$ 28,021	$ 57,877
Interest rate contracts | Customer Derivative Income [Line Items]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	(2,989)	13,905	11,493
Foreign exchange contracts | Foreign exchange income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	52,817	13,799	45,921
Credit contracts | Customer Derivative Income [Line Items]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	(1)	118	139
Equity contracts | Lending fees
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	13	151	382
Commodity contracts | Customer Derivative Income [Line Items]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	$ (25)	$ 48	$ (58)

Derivatives - Offsetting of Der

Derivatives - Offsetting of Derivatives (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Assets
Derivative assets - Fair value	$ 610,920,000	$ 755,328,000
Less: Master Netting Arrangements	(75,534,000)	(242,745,000)
Less: Cash collateral received or paid	(237,258,000)	(372,038,000)
Net derivative assets	298,128,000	140,545,000
Less: Security Collateral Received	(246,259,000)	(60,567,000)
Net derivative assets	51,869,000	79,978,000
Contracts not subject to master netting arrangements, gross amounts recognized	3,000,000	2,000,000
Derivative, cash collateral received, including amount offset by fair value assets, and excess cash amount	(244,000,000)	(385,000,000)
Liabilities
Derivative liabilities - Fair Value	613,314,000	887,264,000
Less: Master Netting Arrangements	(75,534,000)	(242,745,000)
Less: Cash collateral received/paid	(636,000)	0
Net derivative liabilities	537,144,000	644,519,000
Less: Security Collateral Pledged	0	(38,438,000)
Net derivative liabilities	537,144,000	606,081,000
Contracts not subject to master netting arrangements, gross amounts recognized	16,000,000	1,000,000
Derivative, cash collateral posted against derivative liabilities, including amount offset the derivative fair value liabilities, and excess cash amount	$ 1,000,000	$ 490,000
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other liabilities	Accrued expenses and other liabilities

Loans Receivable and Allowanc_3

Loans Receivable and Allowance for Credit Losses - Composition of Loans Held-for-Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jan. 01, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	$ 52,210,782		$ 48,202,430
Allowance for loan losses	(668,743)	$ (601,673)	(595,645)	$ (541,579)	$ (619,983)
Loans held for investment, net	51,542,039		47,606,785
Net deferred loan fees and net unamortized premiums	(71,000)		(70,000)
Commercial Lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	37,045,191		34,780,453
Commercial Lending | C&I
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	16,581,079		15,711,095
Allowance for loan losses	(392,685)	(377,383)	(371,700)	(338,252)	(398,040)
Commercial Lending | CRE
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	14,777,081		13,857,870
Allowance for loan losses	(170,592)	(150,201)	(149,864)	(150,940)	(163,791)
Commercial Lending | Residential loan | Multifamily Residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	5,023,163		4,573,068
Allowance for loan losses	(34,375)	(23,379)	(23,373)	(14,400)	(27,573)
Commercial Lending | Construction and land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	663,868		638,420
Allowance for loan losses	(10,469)	(9,109)	(9,109)	(15,468)	(10,239)
Commercial Lending | Total CRE
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	20,464,112		19,069,358
Consumer Lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	15,165,591		13,421,977
Consumer Lending | Residential loan | Single-Family Residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	13,383,060		11,223,027
Allowance for loan losses	(55,018)	(35,565)	(35,564)	(17,160)	(15,520)
Consumer Lending | HELOCs
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	1,722,204		2,122,655
Allowance for loan losses	(3,947)	(4,476)	(4,475)	(3,435)	(2,690)
Consumer Lending | Total residential mortgage
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	15,105,264		13,345,682
Consumer Lending | Other consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	60,327		76,295
Allowance for loan losses	$ (1,657)	$ (1,560)	$ (1,560)	$ (1,924)	$ (2,130)

Loans Receivable and Allowanc_4

Loans Receivable and Allowance for Credit Losses - Composition of Loans Held-for-Investment Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Accrued interest receivable	$ 267,000	$ 208,000
Total	52,210,782	48,202,430
Asset Pledged as Collateral
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total	$ 37,200,000	$ 28,300,000

Loans Receivable and Allowanc_5

Loans Receivable and Allowance for Credit Losses - Credit Risk Ratings and/or Vintage Years for Loans Held-for-Investment by Portfolio Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	$ 9,030,294,000	$ 12,464,897,000
One Year before Current Fiscal Year	10,960,065,000	8,204,714,000
Two Years before Current Fiscal Year	6,936,329,000	4,810,435,000
Three Years before Current Fiscal Year	4,082,547,000	3,871,740,000
Four Years before Current Fiscal Year	3,402,102,000	2,936,646,000
Prior	5,723,462,000	4,261,980,000
Revolving Loans	11,860,890,000	11,460,495,000
Revolving Loans Converted to Term Loans	215,093,000	191,523,000
Total	52,210,782,000	48,202,430,000
YTD gross write-offs Total	5,000,000	3,000,000	$ 12,000,000
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	8,877,690,000	12,365,799,000
One Year before Current Fiscal Year	10,839,026,000	8,084,723,000
Two Years before Current Fiscal Year	6,723,921,000	4,590,045,000
Three Years before Current Fiscal Year	4,010,720,000	3,791,578,000
Four Years before Current Fiscal Year	3,326,731,000	2,786,218,000
Prior	5,504,224,000	4,158,181,000
Revolving Loans	11,739,785,000	11,359,948,000
Revolving Loans Converted to Term Loans	210,475,000	169,958,000
Total	51,232,572,000	47,306,450,000
Pass | Federal Housing Administration Loan
Financing Receivable, Credit Quality Indicator [Line Items]
Total Nonaccrual Loans	1,000,000	1,000,000
Criticized (accrual)
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	145,219,000	80,235,000
One Year before Current Fiscal Year	111,430,000	96,150,000
Two Years before Current Fiscal Year	207,962,000	208,970,000
Three Years before Current Fiscal Year	64,855,000	76,486,000
Four Years before Current Fiscal Year	67,738,000	142,072,000
Prior	158,049,000	76,117,000
Revolving Loans	119,744,000	99,447,000
Revolving Loans Converted to Term Loans	1,089,000	17,795,000
Total	876,086,000	797,272,000
Criticized (nonaccrual)
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	7,385,000	18,863,000
One Year before Current Fiscal Year	9,609,000	23,841,000
Two Years before Current Fiscal Year	4,446,000	11,420,000
Three Years before Current Fiscal Year	6,972,000	3,676,000
Four Years before Current Fiscal Year	7,633,000	8,356,000
Prior	61,189,000	27,682,000
Revolving Loans	1,361,000	1,100,000
Revolving Loans Converted to Term Loans	3,529,000	3,770,000
Total	102,124,000	98,708,000
YTD gross write-offs
Financing Receivable, Credit Quality Indicator [Line Items]
YTD gross write-offs Current Fiscal Year	350,000
YTD gross write-offs One Year before Current Fiscal Year	10,454,000
YTD gross write-offs Two Years before Current Fiscal Year	424,000
YTD gross write-offs Three Years before Current Fiscal Year	3,758,000
YTD gross write-offs Four Years before Current Fiscal Year	9,748,000
YTD gross write-offs Prior	4,021,000
YTD gross write-offs Revolving Loans	1,593,000
YTD gross write-offs Revolving Loans Converted to Term Loans	6,000
YTD gross write-offs Total	30,354,000
Consumer Loan
Financing Receivable, Credit Quality Indicator [Line Items]
Converted to term loan	44,000,000	0	54,000,000
Commercial Lending
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	5,827,011,000	8,898,251,000
One Year before Current Fiscal Year	7,589,913,000	5,745,996,000
Two Years before Current Fiscal Year	4,647,905,000	3,020,575,000
Three Years before Current Fiscal Year	2,481,175,000	2,761,676,000
Four Years before Current Fiscal Year	2,414,789,000	2,111,867,000
Prior	3,719,778,000	2,719,920,000
Revolving Loans	10,280,425,000	9,462,895,000
Revolving Loans Converted to Term Loans	84,195,000	59,273,000
Total	37,045,191,000	34,780,453,000
Converted to term loan	29,000,000	26,000,000	$ 6,000,000
Commercial Lending | YTD gross write-offs
Financing Receivable, Credit Quality Indicator [Line Items]
YTD gross write-offs Current Fiscal Year	350,000
YTD gross write-offs One Year before Current Fiscal Year	10,454,000
YTD gross write-offs Two Years before Current Fiscal Year	424,000
YTD gross write-offs Three Years before Current Fiscal Year	3,758,000
YTD gross write-offs Four Years before Current Fiscal Year	9,748,000
YTD gross write-offs Prior	3,980,000
YTD gross write-offs Revolving Loans	1,593,000
YTD gross write-offs Revolving Loans Converted to Term Loans	0
YTD gross write-offs Total	30,307,000
Commercial Lending | C&I
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	2,421,686,000	2,922,766,000
One Year before Current Fiscal Year	1,704,375,000	2,092,308,000
Two Years before Current Fiscal Year	1,417,641,000	682,520,000
Three Years before Current Fiscal Year	351,865,000	426,477,000
Four Years before Current Fiscal Year	289,072,000	170,234,000
Prior	204,394,000	120,853,000
Revolving Loans	10,171,903,000	9,275,389,000
Revolving Loans Converted to Term Loans	20,143,000	20,548,000
Total	16,581,079,000	15,711,095,000
Commercial Lending | C&I | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	2,314,463,000	2,831,834,000
One Year before Current Fiscal Year	1,628,560,000	2,053,215,000
Two Years before Current Fiscal Year	1,296,936,000	623,026,000
Three Years before Current Fiscal Year	331,982,000	392,013,000
Four Years before Current Fiscal Year	245,173,000	143,970,000
Prior	164,159,000	97,605,000
Revolving Loans	10,053,757,000	9,177,401,000
Revolving Loans Converted to Term Loans	20,143,000	20,548,000
Total	16,055,173,000	15,339,612,000
Commercial Lending | C&I | Criticized (accrual)
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	105,119,000	72,210,000
One Year before Current Fiscal Year	67,899,000	34,296,000
Two Years before Current Fiscal Year	120,574,000	48,761,000
Three Years before Current Fiscal Year	15,064,000	34,221,000
Four Years before Current Fiscal Year	40,920,000	20,646,000
Prior	22,098,000	12,933,000
Revolving Loans	117,196,000	97,988,000
Revolving Loans Converted to Term Loans	0	0
Total	488,870,000	321,055,000
Commercial Lending | C&I | Criticized (nonaccrual)
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	2,104,000	18,722,000
One Year before Current Fiscal Year	7,916,000	4,797,000
Two Years before Current Fiscal Year	131,000	10,733,000
Three Years before Current Fiscal Year	4,819,000	243,000
Four Years before Current Fiscal Year	2,979,000	5,618,000
Prior	18,137,000	10,315,000
Revolving Loans	950,000	0
Revolving Loans Converted to Term Loans	0	0
Total	37,036,000	50,428,000
Commercial Lending | C&I | YTD gross write-offs
Financing Receivable, Credit Quality Indicator [Line Items]
YTD gross write-offs Current Fiscal Year	350,000
YTD gross write-offs One Year before Current Fiscal Year	10,454,000
YTD gross write-offs Two Years before Current Fiscal Year	424,000
YTD gross write-offs Three Years before Current Fiscal Year	3,758,000
YTD gross write-offs Four Years before Current Fiscal Year	9,748,000
YTD gross write-offs Prior	2,648,000
YTD gross write-offs Revolving Loans	1,593,000
YTD gross write-offs Revolving Loans Converted to Term Loans	0
YTD gross write-offs Total	28,975,000
Commercial Lending | CRE
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	2,529,770,000	4,182,298,000
One Year before Current Fiscal Year	4,120,870,000	2,484,251,000
Two Years before Current Fiscal Year	2,246,593,000	1,664,574,000
Three Years before Current Fiscal Year	1,476,974,000	1,811,774,000
Four Years before Current Fiscal Year	1,625,725,000	1,562,842,000
Prior	2,621,527,000	1,946,298,000
Revolving Loans	92,851,000	167,108,000
Revolving Loans Converted to Term Loans	62,771,000	38,725,000
Total	14,777,081,000	13,857,870,000
Commercial Lending | CRE | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	2,492,915,000	4,178,780,000
One Year before Current Fiscal Year	4,086,385,000	2,404,634,000
Two Years before Current Fiscal Year	2,216,257,000	1,505,150,000
Three Years before Current Fiscal Year	1,428,724,000	1,771,679,000
Four Years before Current Fiscal Year	1,600,844,000	1,471,710,000
Prior	2,494,382,000	1,909,925,000
Revolving Loans	92,851,000	165,653,000
Revolving Loans Converted to Term Loans	62,771,000	22,009,000
Total	14,475,129,000	13,429,540,000
Commercial Lending | CRE | Criticized (accrual)
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	36,855,000	3,518,000
One Year before Current Fiscal Year	34,485,000	60,573,000
Two Years before Current Fiscal Year	30,336,000	159,424,000
Three Years before Current Fiscal Year	48,250,000	40,095,000
Four Years before Current Fiscal Year	24,437,000	91,132,000
Prior	104,340,000	32,173,000
Revolving Loans	0	1,455,000
Revolving Loans Converted to Term Loans	0	16,716,000
Total	278,703,000	405,086,000
Commercial Lending | CRE | Criticized (nonaccrual)
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
One Year before Current Fiscal Year	0	19,044,000
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	444,000	0
Prior	22,805,000	4,200,000
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	23,249,000	23,244,000
Commercial Lending | CRE | YTD gross write-offs
Financing Receivable, Credit Quality Indicator [Line Items]
YTD gross write-offs Current Fiscal Year	0
YTD gross write-offs One Year before Current Fiscal Year	0
YTD gross write-offs Two Years before Current Fiscal Year	0
YTD gross write-offs Three Years before Current Fiscal Year	0
YTD gross write-offs Four Years before Current Fiscal Year	0
YTD gross write-offs Prior	1,329,000
YTD gross write-offs Revolving Loans	0
YTD gross write-offs Revolving Loans Converted to Term Loans	0
YTD gross write-offs Total	1,329,000
Commercial Lending | Real estate loan | Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	665,780,000	1,500,289,000
One Year before Current Fiscal Year	1,484,517,000	892,598,000
Two Years before Current Fiscal Year	862,947,000	641,677,000
Three Years before Current Fiscal Year	612,408,000	520,321,000
Four Years before Current Fiscal Year	499,184,000	354,320,000
Prior	888,356,000	652,538,000
Revolving Loans	8,690,000	11,325,000
Revolving Loans Converted to Term Loans	1,281,000	0
Total	5,023,163,000	4,573,068,000
Commercial Lending | Real estate loan | Pass | Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	665,780,000	1,500,289,000
One Year before Current Fiscal Year	1,481,161,000	892,598,000
Two Years before Current Fiscal Year	808,333,000	641,677,000
Three Years before Current Fiscal Year	612,408,000	519,614,000
Four Years before Current Fiscal Year	498,491,000	350,044,000
Prior	857,713,000	625,293,000
Revolving Loans	8,690,000	11,325,000
Revolving Loans Converted to Term Loans	1,281,000	0
Total	4,933,857,000	4,540,840,000
Commercial Lending | Real estate loan | Criticized (accrual) | Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
One Year before Current Fiscal Year	3,356,000	0
Two Years before Current Fiscal Year	54,614,000	0
Three Years before Current Fiscal Year	0	707,000
Four Years before Current Fiscal Year	693,000	4,276,000
Prior	25,974,000	27,076,000
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	84,637,000	32,059,000
Commercial Lending | Real estate loan | Criticized (nonaccrual) | Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
One Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
Prior	4,669,000	169,000
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	4,669,000	169,000
Commercial Lending | Real estate loan | YTD gross write-offs | Multifamily Residential
Financing Receivable, Credit Quality Indicator [Line Items]
YTD gross write-offs Current Fiscal Year	0
YTD gross write-offs One Year before Current Fiscal Year	0
YTD gross write-offs Two Years before Current Fiscal Year	0
YTD gross write-offs Three Years before Current Fiscal Year	0
YTD gross write-offs Four Years before Current Fiscal Year	0
YTD gross write-offs Prior	3,000
YTD gross write-offs Revolving Loans	0
YTD gross write-offs Revolving Loans Converted to Term Loans	0
YTD gross write-offs Total	3,000
Commercial Lending | Construction and land
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	209,775,000	292,898,000
One Year before Current Fiscal Year	280,151,000	276,839,000
Two Years before Current Fiscal Year	120,724,000	31,804,000
Three Years before Current Fiscal Year	39,928,000	3,104,000
Four Years before Current Fiscal Year	808,000	24,471,000
Prior	5,501,000	231,000
Revolving Loans	6,981,000	9,073,000
Revolving Loans Converted to Term Loans	0	0
Total	663,868,000	638,420,000
Commercial Lending | Construction and land | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	209,775,000	288,394,000
One Year before Current Fiscal Year	280,151,000	276,839,000
Two Years before Current Fiscal Year	120,724,000	31,804,000
Three Years before Current Fiscal Year	39,928,000	3,104,000
Four Years before Current Fiscal Year	808,000	2,805,000
Prior	5,501,000	231,000
Revolving Loans	6,981,000	9,073,000
Revolving Loans Converted to Term Loans	0	0
Total	663,868,000	612,250,000
Commercial Lending | Construction and land | Criticized (accrual)
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	0	4,504,000
One Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	21,666,000
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	26,170,000
Commercial Lending | Construction and land | Criticized (nonaccrual)
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
One Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	0
Commercial Lending | Construction and land | YTD gross write-offs
Financing Receivable, Credit Quality Indicator [Line Items]
YTD gross write-offs Current Fiscal Year	0
YTD gross write-offs One Year before Current Fiscal Year	0
YTD gross write-offs Two Years before Current Fiscal Year	0
YTD gross write-offs Three Years before Current Fiscal Year	0
YTD gross write-offs Four Years before Current Fiscal Year	0
YTD gross write-offs Prior	0
YTD gross write-offs Revolving Loans	0
YTD gross write-offs Revolving Loans Converted to Term Loans	0
YTD gross write-offs Total	0
Commercial Lending | Total CRE
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	3,405,325,000	5,975,485,000
One Year before Current Fiscal Year	5,885,538,000	3,653,688,000
Two Years before Current Fiscal Year	3,230,264,000	2,338,055,000
Three Years before Current Fiscal Year	2,129,310,000	2,335,199,000
Four Years before Current Fiscal Year	2,125,717,000	1,941,633,000
Prior	3,515,384,000	2,599,067,000
Revolving Loans	108,522,000	187,506,000
Revolving Loans Converted to Term Loans	64,052,000	38,725,000
Total	20,464,112,000	19,069,358,000
Commercial Lending | Total CRE | YTD gross write-offs
Financing Receivable, Credit Quality Indicator [Line Items]
YTD gross write-offs Current Fiscal Year	0
YTD gross write-offs One Year before Current Fiscal Year	0
YTD gross write-offs Two Years before Current Fiscal Year	0
YTD gross write-offs Three Years before Current Fiscal Year	0
YTD gross write-offs Four Years before Current Fiscal Year	0
YTD gross write-offs Prior	1,332,000
YTD gross write-offs Revolving Loans	0
YTD gross write-offs Revolving Loans Converted to Term Loans	0
YTD gross write-offs Total	1,332,000
Consumer Lending
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	3,203,283,000	3,566,646,000
One Year before Current Fiscal Year	3,370,152,000	2,458,718,000
Two Years before Current Fiscal Year	2,288,424,000	1,789,860,000
Three Years before Current Fiscal Year	1,601,372,000	1,110,064,000
Four Years before Current Fiscal Year	987,313,000	824,779,000
Prior	2,003,684,000	1,542,060,000
Revolving Loans	1,580,465,000	1,997,600,000
Revolving Loans Converted to Term Loans	130,898,000	132,250,000
Total	15,165,591,000	13,421,977,000
Consumer Lending | YTD gross write-offs
Financing Receivable, Credit Quality Indicator [Line Items]
YTD gross write-offs Current Fiscal Year	0
YTD gross write-offs One Year before Current Fiscal Year	0
YTD gross write-offs Two Years before Current Fiscal Year	0
YTD gross write-offs Three Years before Current Fiscal Year	0
YTD gross write-offs Four Years before Current Fiscal Year	0
YTD gross write-offs Prior	41,000
YTD gross write-offs Revolving Loans	0
YTD gross write-offs Revolving Loans Converted to Term Loans	6,000
YTD gross write-offs Total	47,000
Consumer Lending | Real estate loan | Single-Family Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	3,195,976,000	3,549,035,000
One Year before Current Fiscal Year	3,346,097,000	2,454,992,000
Two Years before Current Fiscal Year	2,284,270,000	1,776,685,000
Three Years before Current Fiscal Year	1,598,046,000	1,106,630,000
Four Years before Current Fiscal Year	985,815,000	823,237,000
Prior	1,972,856,000	1,512,448,000
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	13,383,060,000	11,223,027,000
Consumer Lending | Real estate loan | Pass | Single-Family Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	3,188,830,000	3,548,894,000
One Year before Current Fiscal Year	3,340,789,000	2,453,717,000
Two Years before Current Fiscal Year	2,279,802,000	1,775,696,000
Three Years before Current Fiscal Year	1,594,525,000	1,101,965,000
Four Years before Current Fiscal Year	980,686,000	817,164,000
Prior	1,959,974,000	1,500,359,000
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	13,344,606,000	11,197,795,000
Consumer Lending | Real estate loan | Criticized (accrual) | Single-Family Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	2,680,000	0
One Year before Current Fiscal Year	4,471,000	1,275,000
Two Years before Current Fiscal Year	566,000	785,000
Three Years before Current Fiscal Year	1,440,000	1,463,000
Four Years before Current Fiscal Year	1,503,000	4,352,000
Prior	4,167,000	3,935,000
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	14,827,000	11,810,000
Consumer Lending | Real estate loan | Criticized (nonaccrual) | Single-Family Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	4,466,000	141,000
One Year before Current Fiscal Year	837,000	0
Two Years before Current Fiscal Year	3,902,000	204,000
Three Years before Current Fiscal Year	2,081,000	3,202,000
Four Years before Current Fiscal Year	3,626,000	1,721,000
Prior	8,715,000	8,154,000
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	23,627,000	13,422,000
Consumer Lending | Real estate loan | YTD gross write-offs | Single-Family Residential
Financing Receivable, Credit Quality Indicator [Line Items]
YTD gross write-offs Current Fiscal Year	0
YTD gross write-offs One Year before Current Fiscal Year	0
YTD gross write-offs Two Years before Current Fiscal Year	0
YTD gross write-offs Three Years before Current Fiscal Year	0
YTD gross write-offs Four Years before Current Fiscal Year	0
YTD gross write-offs Prior	0
YTD gross write-offs Revolving Loans	0
YTD gross write-offs Revolving Loans Converted to Term Loans	0
YTD gross write-offs Total	0
Consumer Lending | HELOCs
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	5,021,000	520,000
One Year before Current Fiscal Year	5,957,000	3,589,000
Two Years before Current Fiscal Year	4,019,000	7,819,000
Three Years before Current Fiscal Year	3,326,000	3,434,000
Four Years before Current Fiscal Year	1,498,000	1,542,000
Prior	17,584,000	13,804,000
Revolving Loans	1,553,901,000	1,959,697,000
Revolving Loans Converted to Term Loans	130,898,000	132,250,000
Total	1,722,204,000	2,122,655,000
Consumer Lending | HELOCs | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	3,641,000	520,000
One Year before Current Fiscal Year	3,882,000	3,583,000
Two Years before Current Fiscal Year	1,734,000	7,336,000
Three Years before Current Fiscal Year	3,153,000	3,203,000
Four Years before Current Fiscal Year	729,000	525,000
Prior	9,251,000	8,960,000
Revolving Loans	1,551,074,000	1,958,692,000
Revolving Loans Converted to Term Loans	126,280,000	127,401,000
Total	1,699,744,000	2,110,220,000
Consumer Lending | HELOCs | Criticized (accrual)
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	565,000	0
One Year before Current Fiscal Year	1,219,000	6,000
Two Years before Current Fiscal Year	1,872,000	0
Three Years before Current Fiscal Year	101,000	0
Four Years before Current Fiscal Year	185,000	0
Prior	1,470,000	0
Revolving Loans	2,548,000	4,000
Revolving Loans Converted to Term Loans	1,089,000	1,079,000
Total	9,049,000	1,089,000
Consumer Lending | HELOCs | Criticized (nonaccrual)
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	815,000	0
One Year before Current Fiscal Year	856,000	0
Two Years before Current Fiscal Year	413,000	483,000
Three Years before Current Fiscal Year	72,000	231,000
Four Years before Current Fiscal Year	584,000	1,017,000
Prior	6,863,000	4,844,000
Revolving Loans	279,000	1,001,000
Revolving Loans Converted to Term Loans	3,529,000	3,770,000
Total	13,411,000	11,346,000
Consumer Lending | HELOCs | YTD gross write-offs
Financing Receivable, Credit Quality Indicator [Line Items]
YTD gross write-offs Current Fiscal Year	0
YTD gross write-offs One Year before Current Fiscal Year	0
YTD gross write-offs Two Years before Current Fiscal Year	0
YTD gross write-offs Three Years before Current Fiscal Year	0
YTD gross write-offs Four Years before Current Fiscal Year	0
YTD gross write-offs Prior	41,000
YTD gross write-offs Revolving Loans	0
YTD gross write-offs Revolving Loans Converted to Term Loans	6,000
YTD gross write-offs Total	47,000
Consumer Lending | Total residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	3,200,997,000	3,549,555,000
One Year before Current Fiscal Year	3,352,054,000	2,458,581,000
Two Years before Current Fiscal Year	2,288,289,000	1,784,504,000
Three Years before Current Fiscal Year	1,601,372,000	1,110,064,000
Four Years before Current Fiscal Year	987,313,000	824,779,000
Prior	1,990,440,000	1,526,252,000
Revolving Loans	1,553,901,000	1,959,697,000
Revolving Loans Converted to Term Loans	130,898,000	132,250,000
Total	15,105,264,000	13,345,682,000
Consumer Lending | Total residential mortgage | YTD gross write-offs
Financing Receivable, Credit Quality Indicator [Line Items]
YTD gross write-offs Current Fiscal Year	0
YTD gross write-offs One Year before Current Fiscal Year	0
YTD gross write-offs Two Years before Current Fiscal Year	0
YTD gross write-offs Three Years before Current Fiscal Year	0
YTD gross write-offs Four Years before Current Fiscal Year	0
YTD gross write-offs Prior	41,000
YTD gross write-offs Revolving Loans	0
YTD gross write-offs Revolving Loans Converted to Term Loans	6,000
YTD gross write-offs Total	47,000
Consumer Lending | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	2,286,000	17,091,000
One Year before Current Fiscal Year	18,098,000	137,000
Two Years before Current Fiscal Year	135,000	5,356,000
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
Prior	13,244,000	15,808,000
Revolving Loans	26,564,000	37,903,000
Revolving Loans Converted to Term Loans	0	0
Total	60,327,000	76,295,000
Consumer Lending | Other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	2,286,000	17,088,000
One Year before Current Fiscal Year	18,098,000	137,000
Two Years before Current Fiscal Year	135,000	5,356,000
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
Prior	13,244,000	15,808,000
Revolving Loans	26,432,000	37,804,000
Revolving Loans Converted to Term Loans	0	0
Total	60,195,000	76,193,000
Consumer Lending | Other consumer | Criticized (accrual)
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	0	3,000
One Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	0	0
Revolving Loans Converted to Term Loans	0	0
Total	0	3,000
Consumer Lending | Other consumer | Criticized (nonaccrual)
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
One Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans	132,000	99,000
Revolving Loans Converted to Term Loans	0	0
Total	132,000	$ 99,000
Consumer Lending | Other consumer | YTD gross write-offs
Financing Receivable, Credit Quality Indicator [Line Items]
YTD gross write-offs Current Fiscal Year	0
YTD gross write-offs One Year before Current Fiscal Year	0
YTD gross write-offs Two Years before Current Fiscal Year	0
YTD gross write-offs Three Years before Current Fiscal Year	0
YTD gross write-offs Four Years before Current Fiscal Year	0
YTD gross write-offs Prior	0
YTD gross write-offs Revolving Loans	0
YTD gross write-offs Revolving Loans Converted to Term Loans	0
YTD gross write-offs Total	$ 0

Loans Receivable and Allowanc_6

Loans Receivable and Allowance for Credit Losses - Aging Analysis on Loans Held-for-Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Nonaccrual and Past Due Loans
Total	$ 52,210,782	$ 48,202,430
Commercial Lending
Nonaccrual and Past Due Loans
Total	37,045,191	34,780,453
Commercial Lending | C&I
Nonaccrual and Past Due Loans
Total	16,581,079	15,711,095
Commercial Lending | CRE
Nonaccrual and Past Due Loans
Total	14,777,081	13,857,870
Commercial Lending | Residential loan | Multifamily Residential
Nonaccrual and Past Due Loans
Total	5,023,163	4,573,068
Commercial Lending | Construction and land
Nonaccrual and Past Due Loans
Total	663,868	638,420
Commercial Lending | Total CRE
Nonaccrual and Past Due Loans
Total	20,464,112	19,069,358
Consumer Lending
Nonaccrual and Past Due Loans
Total	15,165,591	13,421,977
Consumer Lending | Residential loan | Single-Family Residential
Nonaccrual and Past Due Loans
Total	13,383,060	11,223,027
Consumer Lending | HELOCs
Nonaccrual and Past Due Loans
Total	1,722,204	2,122,655
Consumer Lending | Total residential mortgage
Nonaccrual and Past Due Loans
Total	15,105,264	13,345,682
Consumer Lending | Other consumer
Nonaccrual and Past Due Loans
Total	60,327	76,295
Current Accruing Loans
Nonaccrual and Past Due Loans
Total	51,984,909	48,040,733
Current Accruing Loans | Commercial Lending
Nonaccrual and Past Due Loans
Total	36,927,223	34,682,072
Current Accruing Loans | Commercial Lending | C&I
Nonaccrual and Past Due Loans
Total	16,508,394	15,651,312
Current Accruing Loans | Commercial Lending | CRE
Nonaccrual and Past Due Loans
Total	14,750,315	13,820,441
Current Accruing Loans | Commercial Lending | Residential loan | Multifamily Residential
Nonaccrual and Past Due Loans
Total	5,017,897	4,571,899
Current Accruing Loans | Commercial Lending | Construction and land
Nonaccrual and Past Due Loans
Total	650,617	638,420
Current Accruing Loans | Commercial Lending | Total CRE
Nonaccrual and Past Due Loans
Total	20,418,829	19,030,760
Current Accruing Loans | Consumer Lending
Nonaccrual and Past Due Loans
Total	15,057,686	13,358,661
Current Accruing Loans | Consumer Lending | Residential loan | Single-Family Residential
Nonaccrual and Past Due Loans
Total	13,313,455	11,183,134
Current Accruing Loans | Consumer Lending | HELOCs
Nonaccrual and Past Due Loans
Total	1,687,301	2,102,523
Current Accruing Loans | Consumer Lending | Total residential mortgage
Nonaccrual and Past Due Loans
Total	15,000,756	13,285,657
Current Accruing Loans | Consumer Lending | Other consumer
Nonaccrual and Past Due Loans
Total	56,930	73,004
Total Accruing Past Due Loans
Nonaccrual and Past Due Loans
Total	122,999	62,171
Total Accruing Past Due Loans | Commercial Lending
Nonaccrual and Past Due Loans
Total	53,014	24,540
Total Accruing Past Due Loans | Commercial Lending | C&I
Nonaccrual and Past Due Loans
Total	35,649	9,355
Total Accruing Past Due Loans | Commercial Lending | CRE
Nonaccrual and Past Due Loans
Total	3,517	14,185
Total Accruing Past Due Loans | Commercial Lending | Residential loan | Multifamily Residential
Nonaccrual and Past Due Loans
Total	597	1,000
Total Accruing Past Due Loans | Commercial Lending | Construction and land
Nonaccrual and Past Due Loans
Total	13,251	0
Total Accruing Past Due Loans | Commercial Lending | Total CRE
Nonaccrual and Past Due Loans
Total	17,365	15,185
Total Accruing Past Due Loans | Consumer Lending
Nonaccrual and Past Due Loans
Total	69,985	37,631
Total Accruing Past Due Loans | Consumer Lending | Residential loan | Single-Family Residential
Nonaccrual and Past Due Loans
Total	45,228	25,653
Total Accruing Past Due Loans | Consumer Lending | HELOCs
Nonaccrual and Past Due Loans
Total	21,492	8,786
Total Accruing Past Due Loans | Consumer Lending | Total residential mortgage
Nonaccrual and Past Due Loans
Total	66,720	34,439
Total Accruing Past Due Loans | Consumer Lending | Other consumer
Nonaccrual and Past Due Loans
Total	3,265	3,192
Accruing Loans 30-59 Days Past Due
Nonaccrual and Past Due Loans
Total	88,791	42,677
Accruing Loans 30-59 Days Past Due | Commercial Lending
Nonaccrual and Past Due Loans
Total	44,117	21,345
Accruing Loans 30-59 Days Past Due | Commercial Lending | C&I
Nonaccrual and Past Due Loans
Total	28,550	6,482
Accruing Loans 30-59 Days Past Due | Commercial Lending | CRE
Nonaccrual and Past Due Loans
Total	1,719	14,185
Accruing Loans 30-59 Days Past Due | Commercial Lending | Residential loan | Multifamily Residential
Nonaccrual and Past Due Loans
Total	597	678
Accruing Loans 30-59 Days Past Due | Commercial Lending | Construction and land
Nonaccrual and Past Due Loans
Total	13,251	0
Accruing Loans 30-59 Days Past Due | Commercial Lending | Total CRE
Nonaccrual and Past Due Loans
Total	15,567	14,863
Accruing Loans 30-59 Days Past Due | Consumer Lending
Nonaccrual and Past Due Loans
Total	44,674	21,332
Accruing Loans 30-59 Days Past Due | Consumer Lending | Residential loan | Single-Family Residential
Nonaccrual and Past Due Loans
Total	29,285	13,523
Accruing Loans 30-59 Days Past Due | Consumer Lending | HELOCs
Nonaccrual and Past Due Loans
Total	12,266	7,700
Accruing Loans 30-59 Days Past Due | Consumer Lending | Total residential mortgage
Nonaccrual and Past Due Loans
Total	41,551	21,223
Accruing Loans 30-59 Days Past Due | Consumer Lending | Other consumer
Nonaccrual and Past Due Loans
Total	3,123	109
Accruing Loans 60-89 Days Past Due
Nonaccrual and Past Due Loans
Total	34,208	19,494
Accruing Loans 60-89 Days Past Due | Commercial Lending
Nonaccrual and Past Due Loans
Total	8,897	3,195
Accruing Loans 60-89 Days Past Due | Commercial Lending | C&I
Nonaccrual and Past Due Loans
Total	7,099	2,873
Accruing Loans 60-89 Days Past Due | Commercial Lending | CRE
Nonaccrual and Past Due Loans
Total	1,798	0
Accruing Loans 60-89 Days Past Due | Commercial Lending | Residential loan | Multifamily Residential
Nonaccrual and Past Due Loans
Total	0	322
Accruing Loans 60-89 Days Past Due | Commercial Lending | Construction and land
Nonaccrual and Past Due Loans
Total	0	0
Accruing Loans 60-89 Days Past Due | Commercial Lending | Total CRE
Nonaccrual and Past Due Loans
Total	1,798	322
Accruing Loans 60-89 Days Past Due | Consumer Lending
Nonaccrual and Past Due Loans
Total	25,311	16,299
Accruing Loans 60-89 Days Past Due | Consumer Lending | Residential loan | Single-Family Residential
Nonaccrual and Past Due Loans
Total	15,943	12,130
Accruing Loans 60-89 Days Past Due | Consumer Lending | HELOCs
Nonaccrual and Past Due Loans
Total	9,226	1,086
Accruing Loans 60-89 Days Past Due | Consumer Lending | Total residential mortgage
Nonaccrual and Past Due Loans
Total	25,169	13,216
Accruing Loans 60-89 Days Past Due | Consumer Lending | Other consumer
Nonaccrual and Past Due Loans
Total	142	3,083
Nonperforming Financial Instruments
Nonaccrual and Past Due Loans
Total	102,874	99,526
Nonperforming Financial Instruments | Commercial Lending
Nonaccrual and Past Due Loans
Total	64,954	73,841
Nonperforming Financial Instruments | Commercial Lending | C&I
Nonaccrual and Past Due Loans
Total	37,036	50,428
Nonperforming Financial Instruments | Commercial Lending | CRE
Nonaccrual and Past Due Loans
Total	23,249	23,244
Nonperforming Financial Instruments | Commercial Lending | Residential loan | Multifamily Residential
Nonaccrual and Past Due Loans
Total	4,669	169
Nonperforming Financial Instruments | Commercial Lending | Construction and land
Nonaccrual and Past Due Loans
Total	0	0
Nonperforming Financial Instruments | Commercial Lending | Total CRE
Nonaccrual and Past Due Loans
Total	27,918	23,413
Nonperforming Financial Instruments | Consumer Lending
Nonaccrual and Past Due Loans
Total	37,920	25,685
Nonperforming Financial Instruments | Consumer Lending | Residential loan | Single-Family Residential
Nonaccrual and Past Due Loans
Total	24,377	14,240
Nonperforming Financial Instruments | Consumer Lending | HELOCs
Nonaccrual and Past Due Loans
Total	13,411	11,346
Nonperforming Financial Instruments | Consumer Lending | Total residential mortgage
Nonaccrual and Past Due Loans
Total	37,788	25,586
Nonperforming Financial Instruments | Consumer Lending | Other consumer
Nonaccrual and Past Due Loans
Total	$ 132	$ 99

Loans Receivable and Allowanc_7

Loans Receivable and Allowance for Credit Losses - Amortized Cost of Loans on Nonaccrual Status (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	$ 72,085	$ 44,585
Commercial Lending
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	59,977	34,342
Commercial Lending | C&I
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	33,089	11,398
Commercial Lending | CRE
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	22,653	22,944
Commercial Lending | Real estate loan | Multifamily Residential
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	4,235	0
Consumer Lending
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	12,108	10,243
Consumer Lending | Real estate loan | Single-Family Residential
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	4,852	2,998
Consumer Lending | HELOCs
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	$ 7,256	$ 7,245

Loans Receivable and Allowanc_8

Loans Receivable and Allowance for Credit Losses - Foreclosed Assets Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Other real estate owned, net	$ 11,000	$ 270
Residential real estate properties
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Recorded investment in consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process	$ 8,000	$ 7,000

Loans Receivable and Allowanc_9

Loans Receivable and Allowance for Credit Losses - Modifications of Outstanding Balance (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Financing Receivable, Modified/TDR [Line Items]
Total	$ 135,257
Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	76,643
Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	20,192
Term Extension/ Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	5,137
Rate Reduction/ Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	32,470
Rate Reduction /Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	815
Commercial Lending
Financing Receivable, Modified/TDR [Line Items]
Total	115,955
Commercial Lending | Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	76,643
Commercial Lending | Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	6,842
Commercial Lending | Term Extension/ Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	0
Commercial Lending | Rate Reduction/ Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	32,470
Commercial Lending | Rate Reduction /Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	0
Commercial Lending | C&I
Financing Receivable, Modified/TDR [Line Items]
Total	$ 69,546
Modification as a % of Loan Class	0.42%
Commercial Lending | C&I | Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	$ 62,704
Commercial Lending | C&I | Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	6,842
Commercial Lending | C&I | Term Extension/ Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	0
Commercial Lending | C&I | Rate Reduction/ Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	0
Commercial Lending | C&I | Rate Reduction /Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	0
Commercial Lending | CRE
Financing Receivable, Modified/TDR [Line Items]
Total	$ 46,409
Modification as a % of Loan Class	0.23%
Commercial Lending | CRE | Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	$ 13,939
Commercial Lending | CRE | Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	0
Commercial Lending | CRE | Term Extension/ Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	0
Commercial Lending | CRE | Rate Reduction/ Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	32,470
Commercial Lending | CRE | Rate Reduction /Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	0
Commercial Lending | Total CRE
Financing Receivable, Modified/TDR [Line Items]
Total	46,409
Commercial Lending | Total CRE | Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	13,939
Commercial Lending | Total CRE | Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	0
Commercial Lending | Total CRE | Term Extension/ Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	0
Commercial Lending | Total CRE | Rate Reduction/ Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	32,470
Commercial Lending | Total CRE | Rate Reduction /Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	0
Consumer Lending
Financing Receivable, Modified/TDR [Line Items]
Total	19,302
Consumer Lending | Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	0
Consumer Lending | Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	13,350
Consumer Lending | Term Extension/ Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	5,137
Consumer Lending | Rate Reduction/ Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	0
Consumer Lending | Rate Reduction /Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	815
Consumer Lending | Real estate loan | Single-Family Residential
Financing Receivable, Modified/TDR [Line Items]
Total	$ 14,169
Modification as a % of Loan Class	0.11%
Consumer Lending | Real estate loan | Term Extension | Single-Family Residential
Financing Receivable, Modified/TDR [Line Items]
Total	$ 0
Consumer Lending | Real estate loan | Payment Delay | Single-Family Residential
Financing Receivable, Modified/TDR [Line Items]
Total	10,202
Consumer Lending | Real estate loan | Term Extension/ Payment Delay | Single-Family Residential
Financing Receivable, Modified/TDR [Line Items]
Total	3,967
Consumer Lending | Real estate loan | Rate Reduction/ Term Extension | Single-Family Residential
Financing Receivable, Modified/TDR [Line Items]
Total	0
Consumer Lending | Real estate loan | Rate Reduction /Payment Delay | Single-Family Residential
Financing Receivable, Modified/TDR [Line Items]
Total	0
Consumer Lending | HELOCs
Financing Receivable, Modified/TDR [Line Items]
Total	$ 5,133
Modification as a % of Loan Class	0.30%
Consumer Lending | HELOCs | Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	$ 0
Consumer Lending | HELOCs | Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	3,148
Consumer Lending | HELOCs | Term Extension/ Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	1,170
Consumer Lending | HELOCs | Rate Reduction/ Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	0
Consumer Lending | HELOCs | Rate Reduction /Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	815
Consumer Lending | Total residential mortgage
Financing Receivable, Modified/TDR [Line Items]
Total	19,302
Consumer Lending | Total residential mortgage | Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	0
Consumer Lending | Total residential mortgage | Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	13,350
Consumer Lending | Total residential mortgage | Term Extension/ Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	5,137
Consumer Lending | Total residential mortgage | Rate Reduction/ Term Extension
Financing Receivable, Modified/TDR [Line Items]
Total	0
Consumer Lending | Total residential mortgage | Rate Reduction /Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Total	$ 815

Loans Receivable and Allowan_10

Loans Receivable and Allowance for Credit Losses - Financial Effects of Loan Modifications (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Principal Forgiveness
Financing Receivable, Modified/TDR [Line Items]
Loan modification amount	$ 371
Commercial Lending | C&I | Principal Forgiveness
Financing Receivable, Modified/TDR [Line Items]
Loan modification amount	$ 371
Commercial Lending | C&I | Term Extension
Financing Receivable, Modified/TDR [Line Items]
Weighted average of loans (in years)	1 year 3 months 18 days
Commercial Lending | C&I | Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Weighted average of loans (in years)	10 months 24 days
Commercial Lending | CRE | Interest Rate Reduction
Financing Receivable, Modified/TDR [Line Items]
Weighted-Average Interest Rate Reduction	3%
Commercial Lending | CRE | Term Extension
Financing Receivable, Modified/TDR [Line Items]
Weighted average of loans (in years)	2 years 1 month 6 days
Consumer Lending | Real estate loan | Principal Forgiveness | Single-Family Residential
Financing Receivable, Modified/TDR [Line Items]
Loan modification amount	$ 0
Consumer Lending | Real estate loan | Interest Rate Reduction | Single-Family Residential
Financing Receivable, Modified/TDR [Line Items]
Weighted-Average Interest Rate Reduction	0%
Consumer Lending | Real estate loan | Term Extension | Single-Family Residential
Financing Receivable, Modified/TDR [Line Items]
Weighted average of loans (in years)	9 years 3 months 18 days
Consumer Lending | Real estate loan | Payment Delay | Single-Family Residential
Financing Receivable, Modified/TDR [Line Items]
Weighted average of loans (in years)	1 year 9 months 18 days
Consumer Lending | HELOCs | Principal Forgiveness
Financing Receivable, Modified/TDR [Line Items]
Loan modification amount	$ 0
Consumer Lending | HELOCs | Interest Rate Reduction
Financing Receivable, Modified/TDR [Line Items]
Weighted-Average Interest Rate Reduction	0.11%
Consumer Lending | HELOCs | Term Extension
Financing Receivable, Modified/TDR [Line Items]
Weighted average of loans (in years)	14 years 2 months 12 days
Consumer Lending | HELOCs | Payment Delay
Financing Receivable, Modified/TDR [Line Items]
Weighted average of loans (in years)	4 years 7 months 6 days

Loans Receivable and Allowan_11

Loans Receivable and Allowance for Credit Losses - Loans Modification Narrative (Details) - Residential Mortgage - Payment Delay $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) Loan
Financing Receivable, Modified/TDR [Line Items]
Financing receivable modifications subsequent default number of contracts | Loan	2
Modification loans subsequently defaulted | $	$ 1

Loans Receivable and Allowan_12

Loans Receivable and Allowance for Credit Losses - Payment Status Recorded Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	$ 135,257
Commitment to lend	4,000	$ 16,000
Current Accruing Loans
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	113,900
Financing Receivables 30 To 89 Days Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	10,755
Nonaccrual Loans 90 or More Days  Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	10,602
Commercial Lending
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	115,955
Commercial Lending | Current Accruing Loans
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	98,496
Commercial Lending | Financing Receivables 30 To 89 Days Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	8,153
Commercial Lending | Nonaccrual Loans 90 or More Days  Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	9,306
Commercial Lending | C&I
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	69,546
Commercial Lending | C&I | Current Accruing Loans
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	52,087
Commercial Lending | C&I | Financing Receivables 30 To 89 Days Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	8,153
Commercial Lending | C&I | Nonaccrual Loans 90 or More Days  Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	9,306
Commercial Lending | CRE
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	46,409
Commercial Lending | CRE | Current Accruing Loans
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	46,409
Commercial Lending | CRE | Financing Receivables 30 To 89 Days Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	0
Commercial Lending | CRE | Nonaccrual Loans 90 or More Days  Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	0
Commercial Lending | Total CRE
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	46,409
Commercial Lending | Total CRE | Current Accruing Loans
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	46,409
Commercial Lending | Total CRE | Financing Receivables 30 To 89 Days Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	0
Commercial Lending | Total CRE | Nonaccrual Loans 90 or More Days  Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	0
Consumer Lending
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	19,302
Consumer Lending | Current Accruing Loans
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	15,404
Consumer Lending | Financing Receivables 30 To 89 Days Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	2,602
Consumer Lending | Nonaccrual Loans 90 or More Days  Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	1,296
Consumer Lending | Real estate loan | Single-Family Residential
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	14,169
Consumer Lending | Real estate loan | Current Accruing Loans | Single-Family Residential
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	11,197
Consumer Lending | Real estate loan | Financing Receivables 30 To 89 Days Past Due | Single-Family Residential
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	2,425
Consumer Lending | Real estate loan | Nonaccrual Loans 90 or More Days  Past Due | Single-Family Residential
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	547
Consumer Lending | HELOCs
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	5,133
Consumer Lending | HELOCs | Current Accruing Loans
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	4,207
Consumer Lending | HELOCs | Financing Receivables 30 To 89 Days Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	177
Consumer Lending | HELOCs | Nonaccrual Loans 90 or More Days  Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	749
Consumer Lending | Total residential mortgage
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	19,302
Consumer Lending | Total residential mortgage | Current Accruing Loans
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	15,404
Consumer Lending | Total residential mortgage | Financing Receivables 30 To 89 Days Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	2,602
Consumer Lending | Total residential mortgage | Nonaccrual Loans 90 or More Days  Past Due
Financing Receivable, Allowance for Credit Losses
Financing receivable, modified, accumulated	$ 1,296

Loans Receivable and Allowan_13

Loans Receivable and Allowance for Credit Losses - Additions to TDRs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan
Financing Receivable, Modified/TDR [Line Items]
Number of Loans | loan	9	6
Pre-Modification Outstanding Recorded Investment	$ 69,712	$ 25,256
Post-modification outstanding recorded investment	39,112	21,329
Financing Impact	$ 12,640	$ 1,108
Commercial Lending
Financing Receivable, Modified/TDR [Line Items]
Number of Loans | loan	7	6
Pre-Modification Outstanding Recorded Investment	$ 69,050	$ 25,256
Post-modification outstanding recorded investment	38,415	21,329
Financing Impact	$ 12,638	$ 1,108
Commercial Lending | C&I
Financing Receivable, Modified/TDR [Line Items]
Number of Loans | loan	7	5
Pre-Modification Outstanding Recorded Investment	$ 69,050	$ 24,155
Post-modification outstanding recorded investment	38,415	20,263
Financing Impact	$ 12,638	$ 1,108
Commercial Lending | Real estate loan | Multifamily Residential
Financing Receivable, Modified/TDR [Line Items]
Number of Loans | loan	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 1,101
Post-modification outstanding recorded investment	0	1,066
Financing Impact	$ 0	$ 0
Commercial Lending | Total CRE
Financing Receivable, Modified/TDR [Line Items]
Number of Loans | loan	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 1,101
Post-modification outstanding recorded investment	0	1,066
Financing Impact	$ 0	$ 0
Consumer Lending
Financing Receivable, Modified/TDR [Line Items]
Number of Loans | loan	2	0
Pre-Modification Outstanding Recorded Investment	$ 662	$ 0
Post-modification outstanding recorded investment	697	0
Financing Impact	$ 2	$ 0
Consumer Lending | HELOCs
Financing Receivable, Modified/TDR [Line Items]
Number of Loans | loan	2	0
Pre-Modification Outstanding Recorded Investment	$ 662	$ 0
Post-modification outstanding recorded investment	697	0
Financing Impact	$ 2	$ 0
Consumer Lending | Total residential mortgage
Financing Receivable, Modified/TDR [Line Items]
Number of Loans | loan	2	0
Pre-Modification Outstanding Recorded Investment	$ 662	$ 0
Post-modification outstanding recorded investment	697	0
Financing Impact	$ 2	$ 0

Loans Receivable and Allowan_14

Loans Receivable and Allowance for Credit Losses - TDR Post-Modifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	$ 39,112	$ 21,329
Principal
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	24,935	5,745
Interest Rate Reduction
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	15,584
Other
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	14,177	0
Commercial Lending
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	38,415	21,329
Commercial Lending | Principal
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	24,238	5,745
Commercial Lending | Interest Rate Reduction
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	15,584
Commercial Lending | Other
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	14,177	0
Commercial Lending | C&I
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	38,415	20,263
Commercial Lending | C&I | Principal
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	24,238	4,679
Commercial Lending | C&I | Interest Rate Reduction
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	15,584
Commercial Lending | C&I | Other
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	14,177	0
Commercial Lending | Real estate loan | Multifamily Residential
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	1,066
Commercial Lending | Real estate loan | Principal | Multifamily Residential
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	1,066
Commercial Lending | Real estate loan | Interest Rate Reduction | Multifamily Residential
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	0
Commercial Lending | Real estate loan | Other | Multifamily Residential
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	0
Commercial Lending | Total CRE
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	1,066
Commercial Lending | Total CRE | Principal
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	1,066
Commercial Lending | Total CRE | Interest Rate Reduction
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	0
Commercial Lending | Total CRE | Other
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	0
Consumer Lending
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	697	0
Consumer Lending | Principal
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	697	0
Consumer Lending | Interest Rate Reduction
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	0
Consumer Lending | Other
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	0
Consumer Lending | HELOCs
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	697	0
Consumer Lending | HELOCs | Principal
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	697	0
Consumer Lending | HELOCs | Interest Rate Reduction
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	0
Consumer Lending | HELOCs | Other
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	0
Consumer Lending | Total residential mortgage
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	697	0
Consumer Lending | Total residential mortgage | Principal
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	697	0
Consumer Lending | Total residential mortgage | Interest Rate Reduction
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	0	0
Consumer Lending | Total residential mortgage | Other
Financing Receivable, Modified/TDR [Line Items]
Post-modification outstanding recorded investment	$ 0	$ 0

Loans Receivable and Allowan_15

Loans Receivable and Allowance for Credit Losses - Loans Modified as TDRs that Subsequently Defaulted (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan	Dec. 31, 2023 USD ($)
Financing Receivable, Modified/TDR [Line Items]
Number of Loans | loan	2	1
Recorded Investment	$ 10,296	$ 11,431
Commitment to lend	$ 16,000		$ 4,000
Commercial Lending
Financing Receivable, Modified/TDR [Line Items]
Number of Loans | loan	2	1
Recorded Investment	$ 10,296	$ 11,431
Commercial Lending | C&I
Financing Receivable, Modified/TDR [Line Items]
Number of Loans | loan	2	1
Recorded Investment	$ 10,296	$ 11,431

Loans Receivable and Allowan_16

Loans Receivable and Allowance for Credit Losses - Allowance for Credit Losses Narrative (Details) $ in Millions	Dec. 31, 2023 USD ($) qtr	Sep. 30, 2023 qtr	Jun. 30, 2023 qtr	Dec. 31, 2022 USD ($)
Financing Receivable, Allowance for Credit Losses
Life time loss rate, period span	8
Financing receivable and off balance sheet credit loss allowance | $	$ 706			$ 622
C&I
Financing Receivable, Allowance for Credit Losses
Life time loss rate, period span		8	11

Loans Receivable and Allowan_17

Loans Receivable and Allowance for Credit Losses - Collateral-Dependent Loans Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Commercial Lending
Financing Receivable, Allowance for Credit Losses
Collateral dependent loans	$ 30	$ 47
Consumer Lending
Financing Receivable, Allowance for Credit Losses
Collateral dependent loans	$ 12	$ 13

Loans Receivable and Allowan_18

Loans Receivable and Allowance for Credit Losses - Summary of Activities in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Allowance for loan losses
Allowance for loan losses, December 31, 2022		$ 595,645
Allowance for loan losses, balance at the beginning of the period	$ 595,645	541,579	$ 619,983
Provision for (reversal of) credit losses	113,571	74,767	(28,954)
Gross charge-offs	(54,372)	(37,920)	(66,592)
Gross recoveries	8,118	19,461	16,614
Total net (charge-offs) recoveries	(46,254)	(18,459)	(49,978)
Foreign currency translation adjustment	(247)	(2,242)	528
Allowance for loan losses, balance at the end of the period	668,743	595,645	541,579
Accounting Standards Update 2022-02
Allowance for loan losses
Impact of ASU 2022-02 adoption		6,028
Allowance for loan losses, balance at the beginning of the period	(6,000)
Allowance for loan losses, balance at the end of the period		(6,000)
Commercial Lending | C&I
Allowance for loan losses
Allowance for loan losses, December 31, 2022		371,700
Allowance for loan losses, balance at the beginning of the period	371,700	338,252	398,040
Provision for (reversal of) credit losses	45,319	37,604	(39,732)
Gross charge-offs	(36,573)	(18,738)	(32,490)
Gross recoveries	6,803	16,824	11,906
Total net (charge-offs) recoveries	(29,770)	(1,914)	(20,584)
Foreign currency translation adjustment	(247)	(2,242)	528
Allowance for loan losses, balance at the end of the period	392,685	371,700	338,252
Commercial Lending | C&I | Accounting Standards Update 2022-02
Allowance for loan losses
Impact of ASU 2022-02 adoption		5,683
Commercial Lending | CRE
Allowance for loan losses
Allowance for loan losses, December 31, 2022		149,864
Allowance for loan losses, balance at the beginning of the period	149,864	150,940	163,791
Provision for (reversal of) credit losses	27,007	8,212	14,282
Gross charge-offs	(7,048)	(10,871)	(28,430)
Gross recoveries	432	1,583	1,297
Total net (charge-offs) recoveries	(6,616)	(9,288)	(27,133)
Foreign currency translation adjustment	0	0	0
Allowance for loan losses, balance at the end of the period	170,592	149,864	150,940
Commercial Lending | CRE | Accounting Standards Update 2022-02
Allowance for loan losses
Impact of ASU 2022-02 adoption		337
Commercial Lending | Residential loan | Multifamily Residential
Allowance for loan losses
Allowance for loan losses, December 31, 2022		23,373
Allowance for loan losses, balance at the beginning of the period	23,373	14,400	27,573
Provision for (reversal of) credit losses	10,454	15,651	(15,076)
Gross charge-offs	(3)	(7,237)	(130)
Gross recoveries	545	559	2,033
Total net (charge-offs) recoveries	542	(6,678)	1,903
Foreign currency translation adjustment	0	0	0
Allowance for loan losses, balance at the end of the period	34,375	23,373	14,400
Commercial Lending | Residential loan | Multifamily Residential | Accounting Standards Update 2022-02
Allowance for loan losses
Impact of ASU 2022-02 adoption		6
Commercial Lending | Construction and land
Allowance for loan losses
Allowance for loan losses, December 31, 2022		9,109
Allowance for loan losses, balance at the beginning of the period	9,109	15,468	10,239
Provision for (reversal of) credit losses	11,537	(6,433)	7,576
Gross charge-offs	(10,413)	0	(2,954)
Gross recoveries	236	74	607
Total net (charge-offs) recoveries	(10,177)	74	(2,347)
Foreign currency translation adjustment	0	0	0
Allowance for loan losses, balance at the end of the period	10,469	9,109	15,468
Commercial Lending | Construction and land | Accounting Standards Update 2022-02
Allowance for loan losses
Impact of ASU 2022-02 adoption		0
Consumer Lending | Residential loan | Single-Family Residential
Allowance for loan losses
Allowance for loan losses, December 31, 2022		35,564
Allowance for loan losses, balance at the beginning of the period	35,564	17,160	15,520
Provision for (reversal of) credit losses	19,384	18,867	1,965
Gross charge-offs	0	(775)	(1,046)
Gross recoveries	69	312	721
Total net (charge-offs) recoveries	69	(463)	(325)
Foreign currency translation adjustment	0	0	0
Allowance for loan losses, balance at the end of the period	55,018	35,564	17,160
Consumer Lending | Residential loan | Single-Family Residential | Accounting Standards Update 2022-02
Allowance for loan losses
Impact of ASU 2022-02 adoption		1
Consumer Lending | HELOCs
Allowance for loan losses
Allowance for loan losses, December 31, 2022		4,475
Allowance for loan losses, balance at the beginning of the period	4,475	3,435	2,690
Provision for (reversal of) credit losses	(424)	1,124	745
Gross charge-offs	(138)	(193)	(45)
Gross recoveries	33	109	45
Total net (charge-offs) recoveries	(105)	(84)	0
Foreign currency translation adjustment	0	0	0
Allowance for loan losses, balance at the end of the period	3,947	4,475	3,435
Consumer Lending | HELOCs | Accounting Standards Update 2022-02
Allowance for loan losses
Impact of ASU 2022-02 adoption		1
Consumer Lending | Other consumer
Allowance for loan losses
Allowance for loan losses, December 31, 2022		1,560
Allowance for loan losses, balance at the beginning of the period	1,560	1,924	2,130
Provision for (reversal of) credit losses	294	(258)	1,286
Gross charge-offs	(197)	(106)	(1,497)
Gross recoveries	0	0	5
Total net (charge-offs) recoveries	(197)	(106)	(1,492)
Foreign currency translation adjustment	0	0	0
Allowance for loan losses, balance at the end of the period	$ 1,657	1,560	$ 1,924
Consumer Lending | Other consumer | Accounting Standards Update 2022-02
Allowance for loan losses
Impact of ASU 2022-02 adoption		$ 0

Loans Receivable and Allowan_19

Loans Receivable and Allowance for Credit Losses - Summary of Activities in Allowance for loan losses by Portfolio Segments and Unfunded Credit Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Allowance for unfunded credit reserves
Allowance for unfunded credit commitments, beginning of period	$ 26,000
Allowance for unfunded credit commitments, end of period	38,000	$ 26,000
Provision for (reversal of) credit losses	125,000	73,500	$ (35,000)
Unfunded Loan Commitment
Allowance for unfunded credit reserves
Allowance for unfunded credit commitments, beginning of period	26,264	27,514	33,577
Provision for (reversal of) credit losses on unfunded credit commitments	11,429	(1,267)	(6,046)
Foreign currency translation adjustments	6	17	(17)
Allowance for unfunded credit commitments, end of period	$ 37,699	$ 26,264	$ 27,514

Loans Receivable and Allowan_20

Loans Receivable and Allowance for Credit Losses - Loans Purchases, Sales and Transfers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans transferred from held-for-investment to held-for-sale	$ 739,379	$ 623,777	$ 599,610
Loans transferred from held-for-sale to held-for-investment		631
Sales	769,822	595,767	621,543
Purchases	599,775	657,270	1,041,711
Writeoff	5,000	3,000	12,000
Loans Sold in Secondary Market | Loans receivable, purchased
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Sales	256,000	208,000	208,000
Commercial And Industrial Loan And Commercial Real Estate Loan | Loans receivable, originated
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Sales	513,000	388,000	413,000
Commercial Lending | C&I
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans transferred from held-for-investment to held-for-sale	647,943	530,524	496,655
Loans transferred from held-for-sale to held-for-investment		0
Sales	674,919	501,289	502,694
Purchases	106,493	363,549	476,690
Commercial Lending | CRE
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans transferred from held-for-investment to held-for-sale	83,282	88,075	78,834
Loans transferred from held-for-sale to held-for-investment		0
Sales	86,749	88,075	78,834
Purchases	0	0	0
Commercial Lending | Residential loan | Multifamily Residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans transferred from held-for-investment to held-for-sale	0	0	0
Loans transferred from held-for-sale to held-for-investment		0
Sales	0	0	0
Purchases	0	0	370
Commercial Lending | Construction and land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans transferred from held-for-investment to held-for-sale	8,154	0	18,883
Loans transferred from held-for-sale to held-for-investment		0
Sales	8,154	0	21,557
Purchases	0	0	0
Consumer Lending | Residential loan | Single-Family Residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans transferred from held-for-investment to held-for-sale	0	5,178	5,238
Loans transferred from held-for-sale to held-for-investment		631
Sales	0	6,403	18,458
Purchases	$ 493,282	$ 293,721	$ 564,651

Investments in Qualified Affo_3

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Investments in Tax Credit and Other Investments, Net [Line Items]
Minimum compliance period to fully utilize tax credits		15 years
Rayliant Global Advisors Limited
Investments in Tax Credit and Other Investments, Net [Line Items]
Equity method investment, ownership (percent)	49.99%
Payments to acquire equity method investments	$ 95
Number of shares (in shares)	349,138
Equity securities without readily determinable fair values		$ 101
Equity securities without readily determinable fair value, amount		109
Rayliant Global Advisors Limited | Minimum | Performance Based Restricted Stock Units
Investments in Tax Credit and Other Investments, Net [Line Items]
Percentage of target award available for grant	20%
Rayliant Global Advisors Limited | Maximum | Performance Based Restricted Stock Units
Investments in Tax Credit and Other Investments, Net [Line Items]
Percentage of target award available for grant	200%
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Other Assets
Investments in Tax Credit and Other Investments, Net [Line Items]
Equity securities with readily determinable fair value		25	$ 24
Equity securities without readily determinable fair value, amount		$ 146	$ 37

Investments in Qualified Affo_4

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	Dec. 31, 2023	Dec. 31, 2022
Assets
Investments in qualified affordable housing partnerships, net	$ 419,785	$ 413,253
Total investments in qualified affordable housing partnerships, tax credit and other investments, net	485,251	350,003
Total	905,036	763,256
Liabilities - Unfunded Commitments
Investments in qualified affordable housing partnerships, net	251,746	266,654
Investments in tax credit and other investments, net	298,990	185,797
Total	$ 550,736	$ 452,451

Investments in Qualified Affo_5

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) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments in qualified housing partnerships, net
Tax credits and other tax benefits recognized	$ 60,939	$ 52,132	$ 50,643
Amortization expense included in income tax expense	43,041	38,759	33,248
Investments in tax credit and other investments, net
Amortization of tax credit and other investments	120,299	113,358	122,457
Unrealized gains (losses) on equity securities with readily determinable values	255	(2,958)	(746)
Historic Tax Credit Investment
Investments in tax credit and other investments, net
Pre-tax impairment charge or recovery	$ 1,000	$ 469	$ 1,000

Investments in Qualified Affo_6

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities - Estimated Unfunded Commitments (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Unfunded commitments related to investments in qualified affordable housing partnerships, tax credit and other investments
2024	$ 339,628
2025	178,171
2026	17,882
2027	2,527
2028	2,115
Thereafter	10,413
Total	$ 550,736

Goodwill (Details)

Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 465,697,000	$ 465,697,000
Goodwill, impairment loss	$ 0

Deposits - Balances for Core De

Deposits - Balances for Core Deposits and Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deposits
Noninterest-bearing demand	$ 15,539,872	$ 21,051,090
Interest-bearing checking	7,558,908	6,672,165
Money market	13,108,727	12,265,024
Time deposits	18,043,464
Total deposits	56,092,438	55,967,849
Time deposits:
Time deposits, at or above FDIC insurance limit	13,600,000	10,600,000
Domestic office
Deposits
Savings:	1,638,916	2,425,784
Time deposits	16,037,287	11,878,734
Foreign office
Deposits
Savings:	202,551	223,253
Time deposits	$ 2,006,177	$ 1,451,799

Deposits - Scheduled Maturities

Deposits - Scheduled Maturities of Time Deposits (Details) $ in Thousands	Dec. 31, 2023 USD ($)
DEPOSIT ACCOUNTS
2024	$ 17,580,178
2025	134,264
2026	186,448
2027	139,279
2028	3,295
Time deposits	$ 18,043,464

Short-Term Borrowings and Lon_3

Short-Term Borrowings and Long-Term Debt - Schedule of Short-Term Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Interest Rate	4.37%
Short-term borrowings	$ 4,500,000	$ 0
Parent company
Debt Instrument [Line Items]
Junior Subordinated Notes	$ 148,249	$ 147,950
Weighted-average rate (as a percent)	6.87%	3.49%
Minimum | Parent company | Subordinated Debt
Debt Instrument [Line Items]
Variable interest rate	7%
Maximum | Parent company | Subordinated Debt
Debt Instrument [Line Items]
Variable interest rate	7.55%

Short-Term Borrowings and Lon_4

Short-Term Borrowings and Long-Term Debt - Narrative (Details)	Dec. 31, 2023 USD ($) trust	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Number of wholly owned subsidiaries that are statutory business trusts | trust	6
Junior subordinated debt
Debt Instrument [Line Items]
Number of statutory business trusts formed for the purpose of issuing junior subordinated debt to third party investors | trust	6
Asset Pledged as Collateral with Right | Notes Payable, Other Payables | Bank Term Funding Program (BTFP)
Debt Instrument [Line Items]
Short-term borrowings | $	$ 4,300,000,000	$ 0
Unused borrowing capacity, amount | $	$ 121,000,000

Short-Term Borrowings and Lon_5

Short-Term Borrowings and Long-Term Debt - Junior Subordinated Debt (Details) - Junior subordinated debt - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Aggregate Principal Amount of Trust Securities	$ 4,641	$ 4,641
Aggregate Principal Amount of the Junior Subordinated Debt	$ 148,000	148,000
East West Capital Trust V
Debt Instrument [Line Items]
Stated Interest Rate, basis spread (as a percent)	2.06%
Current Rate	7.44%
Aggregate Principal Amount of Trust Securities	$ 464	464
Aggregate Principal Amount of the Junior Subordinated Debt	$ 15,000	15,000
East West Capital Trust VI
Debt Instrument [Line Items]
Stated Interest Rate, basis spread (as a percent)	1.76%
Current Rate	7.15%
Aggregate Principal Amount of Trust Securities	$ 619	619
Aggregate Principal Amount of the Junior Subordinated Debt	$ 20,000	20,000
East West Capital Trust VII
Debt Instrument [Line Items]
Stated Interest Rate, basis spread (as a percent)	1.61%
Current Rate	7%
Aggregate Principal Amount of Trust Securities	$ 928	928
Aggregate Principal Amount of the Junior Subordinated Debt	$ 30,000	30,000
East West Capital Trust VIII
Debt Instrument [Line Items]
Stated Interest Rate, basis spread (as a percent)	1.66%
Current Rate	7.02%
Aggregate Principal Amount of Trust Securities	$ 619	619
Aggregate Principal Amount of the Junior Subordinated Debt	$ 18,000	18,000
East West Capital Trust IX
Debt Instrument [Line Items]
Stated Interest Rate, basis spread (as a percent)	2.16%
Current Rate	7.55%
Aggregate Principal Amount of Trust Securities	$ 928	928
Aggregate Principal Amount of the Junior Subordinated Debt	$ 30,000	30,000
MCBI Statutory Trust I
Debt Instrument [Line Items]
Stated Interest Rate, basis spread (as a percent)	1.81%
Current Rate	7.20%
Aggregate Principal Amount of Trust Securities	$ 1,083	1,083
Aggregate Principal Amount of the Junior Subordinated Debt	$ 35,000	$ 35,000

Income Taxes - Components of In

Income Taxes - Components of Income Tax Expense/Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current income tax expense (benefit):
Federal	$ 172,428	$ 163,797	$ 84,249
State	173,080	160,629	95,939
Foreign	2,240	3,133	(1,554)
Total current income tax expense	347,748	327,559	178,634
Deferred income tax (benefit) expense:
Federal	(24,319)	(23,484)	1,528
State	(23,415)	(21,835)	3,259
Foreign	(1,405)	1,331	(25)
Total deferred income tax (benefit) expense	(49,139)	(43,988)	4,762
Income tax expense	$ 298,609	$ 283,571	$ 183,396

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Federal Statutory Rate (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Difference between the effective tax rate implicit in the consolidated financial statements and the statutory federal income tax rate
Statutory U.S. federal tax rate	21%	21%	21%
U.S. state income taxes, net of U.S. federal income tax effect	8.10%	7.80%	7.40%
Tax credits and benefits, net of related expenses	(9.90%)	(8.90%)	(11.30%)
Other, net	1.30%	0.20%	0.30%
Effective tax rate	20.50%	20.10%	17.40%

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Allowance for credit losses and nonperforming assets valuation allowance	$ 217,731	$ 191,187
Investments in qualified affordable housing partnerships, tax credit and other investments, net	28,216	21,011
Stock compensation and other accrued compensation	33,169	25,857
Interest income on nonaccrual loans	7,034	5,185
State taxes	9,885	13,259
Net unrealized losses on debt securities and derivatives	242,303	309,837
Premises and equipment	1,782	3,827
Lease liabilities	32,636	34,859
FDIC special assessment charge	22,212	0
Other	9,019	6,169
Total deferred tax assets	603,987	611,191
Deferred tax liabilities:
Equipment lease financing	15,564	27,237
Investments in qualified affordable housing partnerships, tax credit and other investments, net	23,103	7,709
FHLB stock dividends	1,947	1,926
Mortgage servicing assets	2,102	1,963
Acquired debts	1,398	1,477
Prepaid expenses	2,981	2,478
Operating lease right-of-use assets	30,272	32,606
Other	7,871	6,270
Total deferred tax liabilities	85,238	81,666
Net deferred tax assets	$ 518,749	$ 529,525

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Valuation allowance	$ 0	$ 0

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Activity related to unrecognized tax benefits
Beginning balance	$ 477	$ 5,045	$ 5,045
Settlements with taxing authorities	0	(4,568)	0
Ending balance	1,193	477	5,045
Additions for tax positions related to prior years	459	0	0
Additions for tax positions related to current year	$ 257	$ 0	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Credit-Related Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Commitments to Extend Credit
Expire in One Year or Less	$ 339,628
Expire After Five Years	10,413
Total	550,736
Loan commitments
Commitments to Extend Credit
Expire in One Year or Less	4,576,927
Expire After One Year Through Three Years	3,511,660
Expire After Three Years Through Five Years	889,219
Expire After Five Years	163,641
Total	9,141,447	$ 8,211,571
Commercial letters of credit and SBLCs
Commitments to Extend Credit
Expire in One Year or Less	953,220
Expire After One Year Through Three Years	387,008
Expire After Three Years Through Five Years	137,758
Expire After Five Years	1,132,775
Total	2,610,761	2,291,966
Commitments to Extend Credit
Commitments to Extend Credit
Expire in One Year or Less	5,530,147
Expire After One Year Through Three Years	3,898,668
Expire After Three Years Through Five Years	1,026,977
Expire After Five Years	1,296,416
Total	$ 11,752,208	$ 10,503,537

Commitments and Contingencies_2

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Commitments to Extend Credit
Letters of credit	$ 2,600,000	$ 2,300,000
Allowance for unfunded credit commitments	38,000	26,000
Standby Letters of Credit
Commitments to Extend Credit
Letters of credit	2,600,000	2,300,000
Commercial Letters Of Credit
Commitments to Extend Credit
Letters of credit	24,000	22,000
Loans sold or securitized with recourse | Single Family Residential and Multi-Family Residential | Loans Sold or Securitized with Recourse
Commitments to Extend Credit
Allowance for unfunded credit commitments	$ 40	$ 37

Commitments and Contingencies_3

Commitments and Contingencies - Guarantees Outstanding (Details) - Loans sold or securitized with recourse - Loans Sold or Securitized with Recourse - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Guarantor Obligations, Maximum Potential Future Payments [Abstract]
Expire in One Year or Less	$ 17
Expire After One Year Through Three Years	19
Expire After Three Years Through Five Years	193
Expire After Five Years	20,655
Total	20,884	$ 21,777
Carrying Value	24,908	28,101
Single Family Residential
Guarantor Obligations, Maximum Potential Future Payments [Abstract]
Expire in One Year or Less	17
Expire After One Year Through Three Years	19
Expire After Three Years Through Five Years	28
Expire After Five Years	5,824
Total	5,888	6,781
Carrying Value	5,888	6,781
Multifamily residential
Guarantor Obligations, Maximum Potential Future Payments [Abstract]
Expire in One Year or Less	0
Expire After One Year Through Three Years	0
Expire After Three Years Through Five Years	165
Expire After Five Years	14,831
Total	14,996	14,996
Carrying Value	$ 19,020	$ 21,320

Stock Compensation Plans - Narr

Stock Compensation Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
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]
Weighted-average fair value of awards granted (in dollars per share)	$ 79.93	$ 77.91	$ 77.67
Total fair value of awards that vested	$ 21	$ 18	$ 15
Total unrecognized stock compensation expense	$ 15
Weighted average period to recognize unrecognized compensation cost	1 year 9 months 7 days
Performance-Based RSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target award available for grant	0%
Performance-Based RSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target award available for grant	200%
Performance-Based RSUs | Cliff
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Time-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of awards granted (in dollars per share)	$ 73.13	$ 78.15	$ 71.88
Total fair value of awards that vested	$ 39	$ 30	$ 23
Total unrecognized stock compensation expense	$ 28
Weighted average period to recognize unrecognized compensation cost	1 year 9 months 3 days
2021 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding other than RSUs (in shares)	0	0	0
Common stock, shares authorized (in shares)	17,000,000
Shares available (in shares)	4,000,000

Stock Compensation Plans - Summ

Stock Compensation Plans - Summary of Total Share-Based Compensation Expense and Related Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement [Abstract]
Stock compensation costs	$ 39,867	$ 37,601	$ 32,567
Related net tax benefits for stock compensation plans	$ 8,959	$ 5,293	$ 1,760

Stock Compensation Plans - Su_2

Stock Compensation Plans - Summary of Activity for Time-Based and Performance-Based RSUs (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Time-Based RSUs
Shares
Outstanding at beginning of year (in shares)	1,296,866
Granted (in shares)	515,218
Vested (in shares)	(543,032)
Forfeited (in shares)	(62,534)
Outstanding at end of year (in shares)	1,206,518	1,296,866
Weighted-Average Grant Date Fair Value
Outstanding at end of year (in dollars per share)	$ 60.77
Granted (in dollars per share)	73.13	$ 78.15	$ 71.88
Vested (in dollars per share)	40.93
Forfeited (in dollars per share)	74.04
Outstanding at end of year (in dollars per share)	$ 74.29	$ 60.77
Performance-Based RSUs
Shares
Outstanding at beginning of year (in shares)	332,510
Granted (in shares)	96,271
Vested (in shares)	(152,558)
Forfeited (in shares)	0
Outstanding at end of year (in shares)	276,223	332,510
Weighted-Average Grant Date Fair Value
Outstanding at end of year (in dollars per share)	$ 60.40
Granted (in dollars per share)	79.93	$ 77.91	$ 77.67
Vested (in dollars per share)	39.79
Forfeited (in dollars per share)	0
Outstanding at end of year (in dollars per share)	$ 78.59	$ 60.40

Stock Compensation Plans - Stoc

Stock Compensation Plans - Stock Purchase Plan (Details) - Stock Purchase Plan - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Stock purchase plan
Purchase price of shares in terms compared to market price per share (as a percent)	90%
Annual purchase limitation per employee (in dollars per employee)	$ 22,500
Compensation expense	$ 0
Common stock, shares authorized (in shares)	2,000,000
Shares sold to employees (in shares)	65,971	48,990
Value of shares sold to employees under purchase plan	$ 3,000,000	$ 3,000,000
Shares available (in shares)	151,814

Stockholders_ Equity and Earn_3

Stockholders’ Equity and Earnings Per Share - Earnings Per Share Calculations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Basic:
Net income	$ 1,161,161	$ 1,128,083	$ 872,981
Weighted-average number of shares outstanding (in shares)	141,164	141,326	141,826
Basic EPS (in dollars per share)	$ 8.23	$ 7.98	$ 6.16
Diluted:
Net income	$ 1,161,161	$ 1,128,083	$ 872,981
Weighted-average number of shares outstanding (in shares)	141,164	141,326	141,826
Add: Dilutive impact of unvested RSUs (in shares)	738	1,166	1,314
Diluted weighted average common shares outstanding (in shares)	141,902	142,492	143,140
Diluted EPS (in dollars per share)	$ 8.18	$ 7.92	$ 6.10

Stockholders_ Equity and Earn_4

Stockholders’ Equity and Earnings Per Share - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Stockholders' Equity and Earnings Per Share [Line Items]
Amount of stock repurchase authorized by the board of directors				$ 500
Repurchase of common stock pursuant to the stock repurchase program (in shares)	1,506,091	1,385,517	0
Average price (in dollars per share)	$ 54.56	$ 72.17
Repurchase of common stock pursuant to the stock repurchase program	$ 82	$ 100
Available for repurchase amount	$ 172
RSUs
Stockholders' Equity and Earnings Per Share [Line Items]
Weighted average shares of anti-dilutive restricted stock units (in shares)	283,000	3,000	6,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Components of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 5,984,612	$ 5,837,218	$ 5,269,175
Other comprehensive income (loss)	145,033	(675,248)	(134,706)
Ending balance	6,950,834	5,984,612	5,837,218
Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(694,815)	(85,703)	52,247
Net unrealized gains (losses) arising during the period	76,930	(620,870)	(136,846)
Amounts reclassified from AOCI	16,004	11,758	(1,104)
Other comprehensive income (loss)	92,934	(609,112)	(137,950)
Ending balance	(601,881)	(694,815)	(85,703)
Cash Flow Hedge
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(49,531)	257	(1,230)
Net unrealized gains (losses) arising during the period	(4,277)	(52,623)	866
Amounts reclassified from AOCI	56,432	2,835	621
Other comprehensive income (loss)	52,155	(49,788)	1,487
Ending balance	2,624	(49,531)	257
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(21,283)	(4,935)	(6,692)
Net unrealized gains (losses) arising during the period	(56)	(16,348)	1,757
Amounts reclassified from AOCI	0	0	0
Other comprehensive income (loss)	(56)	(16,348)	1,757
Ending balance	(21,339)	(21,283)	(4,935)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(765,629)	(90,381)	44,325
Net unrealized gains (losses) arising during the period	72,597	(689,841)	(134,223)
Amounts reclassified from AOCI	72,436	14,593	(483)
Other comprehensive income (loss)	145,033	(675,248)	(134,706)
Ending balance	$ (620,596)	$ (765,629)	$ (90,381)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Before-Tax
Net change	$ 206,712	$ (949,946)	$ (193,420)
Tax Effect
Net change	(61,679)	274,698	58,714
Net-of-Tax
Unrealized losses on debt securities transferred from AFS to HTM	0	(112,991)	0
Other comprehensive income (loss)	145,033	(675,248)	(134,706)
Debt Securities
Before-Tax
Net unrealized gains (losses) on AFS debt securities arising during the period	109,216	(721,100)	(194,393)
Unrealized losses on debt securities transferred from AFS to HTM	0	160,416	0
Net realized (gains) losses reclassified into net income	6,862	(1,306)	(1,568)
Amortization of unrealized losses on transferred securities	15,860	18,000	0
Net change	131,938	(864,822)	(195,961)
Tax Effect
Net unrealized gains (losses) on AFS debt securities arising during the period	32,286	(213,221)	(57,547)
Unrealized losses on debt securities transferred from AFS to HTM	0	47,425	0
Net realized (gains) losses reclassified into net income	(2,029)	386	464
Amortization of unrealized losses on transferred securities	(4,689)	(5,322)	0
Net change	(39,004)	255,710	58,011
Net-of-Tax
Net unrealized gains (losses) on AFS debt securities arising during the period	76,930	(507,879)	(136,846)
Net unrealized gains (losses) arising during the period	76,930	(620,870)	(136,846)
Unrealized losses on debt securities transferred from AFS to HTM	0	(112,991)	0
Net realized (gains) losses reclassified into net income	4,833	(920)	(1,104)
Amortization of unrealized losses on transferred securities	11,171	12,678	0
Net realized gains reclassified into net income	16,004	11,758	(1,104)
Other comprehensive income (loss)	92,934	(609,112)	(137,950)
Cash Flow Hedge
Before-Tax
Net unrealized gains (losses) on AFS debt securities arising during the period	(5,767)	(74,069)	1,210
Net realized gains reclassified into net income	79,843	4,004	868
Net change	74,076	(70,065)	2,078
Tax Effect
Net unrealized gains (losses) arising during the period	1,490	21,446	(344)
Net realized gains reclassified into net income	(23,411)	(1,169)	(247)
Net change	(21,921)	20,277	(591)
Net-of-Tax
Net unrealized gains (losses) arising during the period	(4,277)	(52,623)	866
Net realized gains reclassified into net income	56,432	2,835	621
Other comprehensive income (loss)	52,155	(49,788)	1,487
Foreign Currency Translation Adjustments
Before-Tax
Net unrealized gains (losses) on AFS debt securities arising during the period	698	(15,059)	463
Net change	698	(15,059)	463
Tax Effect
Net unrealized gains (losses) arising during the period	(754)	(1,289)	1,294
Net change	(754)	(1,289)	1,294
Net-of-Tax
Net unrealized gains (losses) arising during the period	(56)	(16,348)	1,757
Net realized gains reclassified into net income	0	0	0
Other comprehensive income (loss)	$ (56)	$ (16,348)	$ 1,757

Regulatory Requirements and M_3

Regulatory Requirements and Matters - Narrative (Details)	Dec. 31, 2023
Capital adequacy
Common equity tier 1 capital adequacy to risk weighted assets	0.045
Banking regulation, tier one risk-based capital ratio, capital a, minimum	0.060
Banking regulation,total risk-based capital ratio, capital adequacy, minimum	0.080
Banking regulation, tier one leverage capital ratio, capital adequacy, minimum	0.040
Fully phased-in capital conservation buffer	2.50%
East West Bank
Capital adequacy
Common equity tier 1 capital adequacy to risk weighted assets	0.045
Banking regulation, tier one risk-based capital ratio, capital a, minimum	0.060
Banking regulation,total risk-based capital ratio, capital adequacy, minimum	0.080
Banking regulation, tier one leverage capital ratio, capital adequacy, minimum	0.040

Regulatory Requirements and M_4

Regulatory Requirements and Matters - Regulatory Capital Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Minimum Capital Ratios
Total capital ratio required for capital adequacy to risk weighted assets	0.080
Tier 1 risk based capital ratio required for capital adequacy to risk weighted assets	0.060
Common equity tier 1 capital adequacy to risk weighted assets	0.045
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent)	0.040
Well-Capitalized Requirement
Fully phased-in capital conservation buffer	2.50%
Company
Actual
Total capital (to risk-weighted assets), Amount	$ 7,919,407	$ 7,003,299
Tier I capital (to risk-weighted assets), Amount	7,140,778	6,347,108
Tier 1 Common Equity capital (to risk-weighted assets), Amount	7,140,778	6,347,108
Tier 1 leverage capital (to adjusted average assets), Amount	7,140,778	6,347,108
Risk-weighted assets	53,663,392	50,036,719
Adjusted quarterly average total assets	$ 70,406,008	$ 65,221,597
Total capital (to risk-weighted assets), Ratio (as a percent)	0.148	0.140
Tier I capital (to risk-weighted assets), Ratio (as a percent)	0.133	0.127
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent)	0.133	0.127
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent)	0.102	0.098
Minimum Capital Ratios
Total capital ratio required for capital adequacy to risk weighted assets	0.080
Tier 1 risk based capital ratio required for capital adequacy to risk weighted assets	0.060
Common equity tier 1 capital adequacy to risk weighted assets	0.045
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent)	0.040
Fully phased-in minimum capital ratios
Total capital (to risk-weighted assets), Ratio (as a percent)	10.50%
Tier I capital (to risk-weighted assets), Ratio (as a percent)	8.50%
Tier 1 Common Equity Capital (to risk-weighted assets), Ratio (as a percent)	7%
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent)	4%
Well-Capitalized Requirement
Total capital (to risk-weighted assets), Ratio (as a percent)	0.100
Tier I capital (to risk-weighted assets), Ratio (as a percent)	0.060
East West Bank
Actual
Total capital (to risk-weighted assets), Amount	$ 7,363,575	$ 6,760,612
Tier I capital (to risk-weighted assets), Amount	6,732,946	6,252,421
Tier 1 Common Equity capital (to risk-weighted assets), Amount	6,732,946	6,252,421
Tier 1 leverage capital (to adjusted average assets), Amount	6,732,946	6,252,421
Risk-weighted assets	53,539,980	50,024,772
Adjusted quarterly average total assets	$ 70,270,449	$ 65,198,267
Total capital (to risk-weighted assets), Ratio (as a percent)	0.138	0.135
Tier I capital (to risk-weighted assets), Ratio (as a percent)	0.126	0.125
Tier 1 Common Equity capital (to risk-weighted assets), Ratio (as a percent)	0.126	0.125
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent)	0.096	0.097
Minimum Capital Ratios
Total capital ratio required for capital adequacy to risk weighted assets	0.080
Tier 1 risk based capital ratio required for capital adequacy to risk weighted assets	0.060
Common equity tier 1 capital adequacy to risk weighted assets	0.045
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent)	0.040
Fully phased-in minimum capital ratios
Total capital (to risk-weighted assets), Ratio (as a percent)	10.50%
Tier I capital (to risk-weighted assets), Ratio (as a percent)	8.50%
Tier 1 Common Equity Capital (to risk-weighted assets), Ratio (as a percent)	7%
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent)	4%
Well-Capitalized Requirement
Total capital (to risk-weighted assets), Ratio (as a percent)	0.100
Tier I capital (to risk-weighted assets), Ratio (as a percent)	0.080
Tier 1 Common Equity Capital (to risk-weighted assets), Ratio (as a percent)	0.065
Tier 1 leverage capital (to adjusted average assets), Ratio (as a percent)	0.050

Business Segments - Narrative (

Business Segments - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 segment
Segment Reporting [Abstract]
Number of reportable segments	3
Number of core segment	2

Business Segments - Operating R

Business Segments - Operating Results and Other Key Financial Measures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information
Net interest income before (reversal of) provision for credit losses	$ 2,312,254	$ 2,045,881	$ 1,531,571
(Reversal of) provision for credit losses	125,000	73,500	(35,000)
Noninterest income	295,264	298,666	285,895
Noninterest expense	1,022,748	859,393	796,089
INCOME BEFORE INCOME TAXES	1,459,770	1,411,654	1,056,377
Segment net income	1,161,161	1,128,083	872,981
Segment assets	69,612,884	64,112,150	60,870,701
Consumer and Business Banking
Segment Reporting Information
Net interest income before (reversal of) provision for credit losses	1,238,829	1,170,850	697,101
(Reversal of) provision for credit losses	18,422	27,197	(4,998)
Noninterest income	102,109	110,139	94,125
Noninterest expense	477,622	397,882	364,635
INCOME BEFORE INCOME TAXES	844,894	855,910	431,589
Segment net income	596,366	608,120	308,630
Segment assets	19,510,836	17,385,804	14,961,809
Commercial Banking
Segment Reporting Information
Net interest income before (reversal of) provision for credit losses	992,519	892,386	766,202
(Reversal of) provision for credit losses	106,578	46,303	(30,002)
Noninterest income	174,465	179,248	163,768
Noninterest expense	382,865	314,185	275,649
INCOME BEFORE INCOME TAXES	677,541	711,146	684,323
Segment net income	478,418	507,467	489,233
Segment assets	35,095,237	33,042,785	28,556,706
Other
Segment Reporting Information
Net interest income before (reversal of) provision for credit losses	80,906	(17,355)	68,268
(Reversal of) provision for credit losses	0	0	0
Noninterest income	18,690	9,279	28,002
Noninterest expense	162,261	147,326	155,805
INCOME BEFORE INCOME TAXES	(62,665)	(155,402)	(59,535)
Segment net income	86,377	12,496	75,118
Segment assets	$ 15,006,811	$ 13,683,561	$ 17,352,186

Parent Company Condensed Fina_3

Parent Company Condensed Financial Statements - Condensed Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Cash and cash equivalents due from subsidiary bank	$ 4,614,984	$ 3,481,784
Other assets	1,964,743	1,608,038
TOTAL	69,612,884	64,112,150	$ 60,870,701
LIABILITIES AND STOCKHOLDERS’ EQUITY
Total stockholders’ equity	6,950,834	5,984,612	$ 5,837,218	$ 5,269,175
TOTAL	69,612,884	64,112,150
Parent Company
ASSETS
Cash and cash equivalents due from subsidiary bank	445,770	228,531
Investments in tax credit investments, net	0	1,925
Other assets	120,742	8,516
TOTAL	7,122,866	6,142,593
LIABILITIES AND STOCKHOLDERS’ EQUITY
Long-term debt	148,249	147,950
Other liabilities	23,783	10,031
Total stockholders’ equity	6,950,834	5,984,612
TOTAL	7,122,866	6,142,593
Parent Company | Bank
ASSETS
Investments in Subsidiaries	6,542,852	5,889,775
Parent Company | Nonbank
ASSETS
Investments in Subsidiaries	$ 13,502	$ 13,846

Parent Company Condensed Fina_4

Parent Company Condensed Financial Statements - Condensed Statement of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of income
Other investment losses	$ (2,738)	$ 0	$ 0
Interest expense on long-term debt	1,381,551	275,350	87,163
Compensation and employee benefits	508,538	477,635	433,728
(Impairment recoveries) amortization of tax credit and other investments	120,299	113,358	122,457
Other expense	140,222	118,166	96,330
Income tax benefit	(298,609)	(283,571)	(183,396)
NET INCOME	1,161,161	1,128,083	872,981
Parent Company
Statement of income
Other income	0	0	11
Total income	701,584	240,157	200,093
Interest expense on long-term debt	10,889	5,450	2,974
Compensation and employee benefits	7,204	6,708	6,370
(Impairment recoveries) amortization of tax credit and other investments	(2,901)	(786)	425
Other expense	1,815	2,040	1,306
Total expense	17,007	13,412	11,075
Income before income tax benefit and equity in undistributed income of subsidiaries	684,577	226,745	189,018
Income tax benefit	5,844	4,269	3,005
Undistributed earnings of subsidiaries, primarily bank	470,740	897,069	680,958
NET INCOME	1,161,161	1,128,083	872,981
Parent Company | Bank
Statement of income
Dividends from subsidiaries	704,000	240,000	200,000
Parent Company | Nonbank
Statement of income
Dividends from subsidiaries	$ 322	$ 157	$ 82

Parent Company Condensed Fina_5

Parent Company Condensed Financial Statements - Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of cash flows
Net income	$ 1,161,161	$ 1,128,083	$ 872,981
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income tax expense (benefit)	(49,139)	(43,988)	4,762
Net change in other assets	(146,270)	187,512	124,496
Net change in other liabilities	105,304	461,385	(63,360)
Other operating activities, net	3,860	1,673	558
Net cash provided by operating activities	1,424,909	2,066,022	1,168,422
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in investments in tax credit investments	(228,550)	(167,303)	(189,836)
Distributions received from equity method investees	23,774	18,221	14,440
Other investing activities, net	(112,036)	(7,720)	(4,763)
Net cash used in investing activities	(4,247,161)	(4,582,892)	(9,117,204)
Common stock:
Proceeds from issuance pursuant to various stock compensation plans and agreements	3,208	3,178	2,573
Stocks tendered for payment of withholding taxes	(23,751)	(19,087)	(15,702)
Repurchase of common stocks pursuant to the Stock Repurchase Program	(82,174)	(99,990)	0
Cash dividends paid	(274,554)	(228,381)	(188,762)
Net cash provided by financing activities	3,962,454	2,114,210	7,835,045
Net increase (decrease) in cash and cash equivalents	1,133,200	(431,151)	(105,036)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	3,481,784	3,912,935	4,017,971
CASH AND CASH EQUIVALENTS, END OF YEAR	4,614,984	3,481,784	3,912,935
Parent Company
Statement of cash flows
Net income	1,161,161	1,128,083	872,981
Adjustments to reconcile net income to net cash provided by operating activities:
Undistributed earnings of subsidiaries, principally bank	(470,740)	(897,069)	(680,958)
Deferred income tax expense (benefit)	948	(2,193)	2,721
Net change in other assets	(4,160)	4,250	(5,685)
Net change in other liabilities	(47)	779	(81,706)
Other operating activities, net	2,443	1,333	1,877
Net cash provided by operating activities	689,605	235,183	109,230
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in investments in tax credit investments	0	(1,612)	(346)
Distributions received from equity method investees	1,594	410	436
Other investing activities, net	(96,689)	(6,188)	(1,476)
Net cash used in investing activities	(95,095)	(7,390)	(1,386)
Common stock:
Proceeds from issuance pursuant to various stock compensation plans and agreements	3,208	3,178	2,573
Stocks tendered for payment of withholding taxes	(23,751)	(19,087)	(15,702)
Repurchase of common stocks pursuant to the Stock Repurchase Program	(82,174)	(99,990)	0
Cash dividends paid	(274,554)	(228,381)	(188,762)
Net cash provided by financing activities	(377,271)	(344,280)	(201,891)
Net increase (decrease) in cash and cash equivalents	217,239	(116,487)	(94,047)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	228,531	345,018	439,065
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 445,770	$ 228,531	$ 345,018

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		2 Months Ended
	Feb. 15, 2024	Jan. 31, 2024	Nov. 30, 2023	Feb. 29, 2024	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Increase in FDIC Special Assessment [Abstract]
Pre-tax special assessment charge			$ 70,000
November 2023 Final Rule
Increase in FDIC Special Assessment [Abstract]
FDIC Deposit Insurance, Special Assessment, Estimated Loss			$ 16,300,000
Junior subordinated debt
Redemption of Junior Subordinated Debt and Trust Preferred Securities Issued by East West Capital Trusts [Abstract]
Aggregate principal amount of the junior subordinated debt						$ 148,000	$ 148,000
East West Capital Trusts | Junior subordinated debt | Forecast
Redemption of Junior Subordinated Debt and Trust Preferred Securities Issued by East West Capital Trusts [Abstract]
Junior subordinated debenture owed to unconsolidated subsidiary trust and trust preferred securities				$ 16,000	$ 101,000
Subsequent Event
Declaration of Dividend
Dividends paid per common share (in dollars per share)	$ 0.55
Increase in FDIC Special Assessment [Abstract]
FDIC Deposit Insurance, Special Assessment, Increase				4,100,000
Subsequent Event | February 2024 Update
Increase in FDIC Special Assessment [Abstract]
FDIC Deposit Insurance, Special Assessment, Estimated Loss				$ 20,400,000
Subsequent Event | East West Capital Trusts | Junior subordinated debt
Redemption of Junior Subordinated Debt and Trust Preferred Securities Issued by East West Capital Trusts [Abstract]
Aggregate principal amount of the junior subordinated debt		$ 113,000
Payments for repurchase of trust preferred securities		$ 4,000