East West Bancorp (EWBC) 10-Q 7 May 21 2021 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	000-24939
Entity Registrant Name	EAST WEST BANCORP, INC.
Entity Central Index Key	0001069157
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false
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 each class	Common Stock, par value $0.001 per share
Trading Symbol	EWBC
Name of each exchange on which registered	NASDAQ
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		141,863,399

Consolidated Balance Sheet - Un

Consolidated Balance Sheet - Unaudited - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Cash and due from banks	$ 582,270	$ 592,117
Interest-bearing cash with banks	4,036,863	3,425,854
Cash and cash equivalents	4,619,133	4,017,971
Interest-bearing deposits with banks	741,923	809,728
Assets purchased under resale agreements (“resale agreements”)	2,160,038	1,460,000
Securities:
Available-for-sale (“AFS”) debt securities, at fair value (amortized cost of $7,904,546 in 2021 and $5,470,523 in 2020; includes assets pledged as collateral of $590,858 in 2021 and $588,484 in 2020)	7,789,213	5,544,658
Restricted equity securities, at cost	83,250	83,046
Loans held-for-sale	0	1,788
Loans held-for-investment (net of allowance for loan losses of $607,506 in 2021 and $619,983 in 2020; includes assets pledged as collateral of $23,591,704 in 2021 and $23,263,517 in 2020)	38,981,242	37,770,972
Investments in qualified affordable housing partnerships, net	284,862	213,555
Investments in tax credit and other investments, net	361,438	266,525
Premises and equipment (net of accumulated depreciation of $130,926 in 2021 and $127,884 in 2020)	102,120	103,251
Goodwill	465,697	465,697
Operating lease right-of-use assets	94,483	95,460
Other assets	1,190,747	1,324,262
TOTAL	56,874,146	52,156,913
LIABILITIES
Noninterest-bearing	18,919,298	16,298,301
Interest-bearing	30,627,838	28,564,451
Total deposits	49,547,136	44,862,752
Short-term borrowings	0	21,009
Federal Home Loan Bank (“FHLB”) advances	653,035	652,612
Assets sold under repurchase agreements (“repurchase agreements”)	300,000	300,000
Long-term debt and finance lease liabilities	152,195	151,739
Operating lease liabilities	101,828	102,830
Accrued expenses and other liabilities	834,925	796,796
Total liabilities	51,589,119	46,887,738
COMMITMENTS AND CONTINGENCIES (Note 10)
STOCKHOLDERS’ EQUITY
Common stock, $0.001 par value, 200,000,000 shares authorized; 167,716,333 and 167,240,600 shares issued in 2021 and 2020, respectively	168	167
Additional paid-in capital	1,865,933	1,858,352
Retained earnings	4,158,032	4,000,414
Treasury stock, at cost 25,873,297 shares in 2021 and 25,675,371 shares in 2020	(649,066)	(634,083)
Accumulated other comprehensive (loss) income (“AOCI”), net of tax	(90,040)	44,325
Total stockholders’ equity	5,285,027	5,269,175
TOTAL	$ 56,874,146	$ 52,156,913

Consolidated Balance Sheet - _2

Consolidated Balance Sheet - Unaudited (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Available-for-sale (AFS), at amortized cost	$ 7,904,546	$ 5,470,523
Available for sale debt investment securities pledged as collateral, fair value	590,858	588,484
Allowance for loan losses	607,506	619,983
Loans held-for-investment pledged as collateral	23,591,704	23,263,517
Premises and equipment, accumulated depreciation	$ 130,926	$ 127,884
STOCKHOLDERS’ EQUITY
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	167,716,333	167,240,600
Treasury stock, shares (in shares)	25,873,297	25,675,371

Consolidated Statement of Incom

Consolidated Statement of Income - Unaudited - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
INTEREST AND DIVIDEND INCOME
Loans receivable, including fees	$ 342,008	$ 411,869
AFS debt securities	29,100	20,142
Resale agreements	6,099	5,625
Restricted equity securities	547	446
Interest-bearing cash and deposits with banks	3,632	11,108
Total interest and dividend income	381,386	449,190
INTEREST EXPENSE
Deposits	21,822	76,403
Short-term borrowings	42	556
FHLB advances	3,069	4,166
Repurchase agreements	1,978	3,991
Long-term debt and finance lease liabilities	780	1,367
Total interest expense	27,691	86,483
Net interest income before provision for credit losses	353,695	362,707
Provision for credit losses	0	73,870
Net interest income after provision for credit losses	353,695	288,837
NONINTEREST INCOME
Lending fees	18,357	15,773
Deposit account fees	15,383	10,447
Interest rate contracts and other derivative income	16,997	7,073
Foreign exchange income	9,526	7,819
Wealth management fees	6,911	5,353
Net gains on sales of loans	1,781	950
Gains on sales of AFS debt securities	192	1,529
Other investment income	925	3,378
Other income	2,794	3,184
Total noninterest income	72,866	55,506
NONINTEREST EXPENSE
Compensation and employee benefits	107,808	101,960
Occupancy and equipment expense	15,922	17,076
Deposit insurance premiums and regulatory assessments	3,876	3,427
Deposit account expense	3,892	3,563
Data processing	4,478	3,826
Computer software expense	7,159	6,166
Consulting expense	1,475	1,217
Legal expense	1,502	3,197
Other operating expense	19,607	21,119
Amortization of tax credit and other investments	25,358	18,782
Total noninterest expense	191,077	180,333
INCOME BEFORE INCOME TAXES	235,484	164,010
INCOME TAX EXPENSE	30,490	19,186
NET INCOME	$ 204,994	$ 144,824
EARNINGS PER SHARE (“EPS”)
BASIC (in dollars per share)	$ 1.45	$ 1
DILUTED (in dollars per share)	$ 1.44	$ 1
WEIGHTED-AVERAGE NUMBER OF SHARES OUTSTANDING
BASIC (in shares)	141,646	144,814
DILUTED (in shares)	142,844	145,285

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - Unaudited - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 204,994	$ 144,824
Other comprehensive (loss) income, net of tax:
Net changes in unrealized (losses) gains on AFS debt securities	(133,448)	27,453
Net changes in unrealized gains on cash flow hedges	432	0
Foreign currency translation adjustments	(1,349)	(2,164)
Other comprehensive (loss) income	(134,365)	25,289
COMPREHENSIVE INCOME	$ 70,629	$ 170,113

Consolidated Statement of Chang

Consolidated Statement of Changes in Stockholders' Equity - Unaudited - USD ($) $ in Thousands		Total	Cumulative Effect, Period Of Adoption, Adjustment	Common Stock	Common Stock and Additional Paid-In Capital	Retained Earnings	Retained EarningsCumulative Effect, Period Of Adoption, Adjustment	Treasury Stock	AOCI, Net of Tax
Beginning balance (in shares) at Dec. 31, 2019				145,625,385
Beginning balance at Dec. 31, 2019		$ 5,017,617			$ 1,826,512	$ 3,689,377		$ (479,864)	$ (18,408)
Beginning balance (ASU 2016-13) at Dec. 31, 2019	[1]		$ (97,967)				$ (97,967)
Increase (Decrease) in Stockholders' Equity
Net income		144,824				144,824
Other comprehensive income		25,289							25,289
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)				281,396
Net activity of common stock pursuant to various stock compensation plans and agreements		(337)			7,272			(7,609)
Repurchase of common stock pursuant to the Stock Repurchase Program (in shares)				(4,471,682)
Repurchase of common stock pursuant to the Stock Repurchase Program		(145,966)						(145,966)
Cash dividends on common stock		(40,475)				(40,475)
Ending balance (in shares) at Mar. 31, 2020				141,435,099
Ending balance at Mar. 31, 2020		4,902,985			1,833,784	3,695,759		(633,439)	6,881
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		204,994				204,994
Other comprehensive income		(134,365)							(134,365)
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)				277,807
Net activity of common stock pursuant to various stock compensation plans and agreements		(7,401)			7,582			(14,983)
Cash dividends on common stock		(47,376)				(47,376)
Ending balance (in shares) at Mar. 31, 2021				141,843,036
Ending balance at Mar. 31, 2021		$ 5,285,027			$ 1,866,101	$ 4,158,032		$ (649,066)	$ (90,040)
[1]	Represents the impact of the adoption of Accounting Standards Update (“ASU”) 2016-13, Financial Instruments — Credit Losses (Topic 326) on January 1, 2020.

Consolidated Statement of Cha_2

Consolidated Statement of Changes in Stockholders' Equity - Unaudited (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share (in dollars per share)	$ 0.330	$ 0.275

Consolidated Statement of Cash

Consolidated Statement of Cash Flows - Unaudited - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 204,994	$ 144,824
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37,490	31,186
Amortization of premiums and accretion of discount , net	5,770	(4,519)
Stock compensation costs	7,817	7,209
Deferred income tax benefit	224	28
Provision for credit losses	0	73,870
Net gains on sales of loans	(1,781)	(950)
Gains on sales of AFS debt securities	(192)	(1,529)
Loans held-for-sale:
Originations and purchases	(5,718)	(5,802)
Proceeds from sales and paydowns/payoffs of loans originally classified as held-for-sale	7,644	4,657
Proceeds from distributions received from equity method investees	2,505	973
Net change in accrued interest receivable and other assets	185,677	(462,766)
Net change in accrued expenses and other liabilities	(72,935)	304,680
Other net operating activities	20	(158)
Total adjustments	166,521	(53,121)
Net cash provided by operating activities	371,515	91,703
CASH FLOWS FROM INVESTING ACTIVITIES
Investments in qualified affordable housing partnerships, tax credit and other investments	(52,756)	(27,581)
Interest-bearing deposits with banks	29,000	(115,419)
Resale agreements:
Proceeds from paydowns and maturities	223,952	250,000
Purchases	(923,990)	0
AFS debt securities:
Proceeds from sales	46,397	306,463
Proceeds from repayments, maturities and redemptions	473,808	308,620
Purchases	(2,969,640)	(987,130)
Loans held-for-investment:
Proceeds from sales of loans originally classified as held-for-investment	147,115	110,945
Purchases	(311,030)	(133,185)
Other changes in loans held-for-investment, net	(1,046,727)	(1,116,358)
Purchases of premises and equipment	(1,563)	(916)
Proceeds from distributions received from equity method investees	2,832	374
Other net investing activities	(1,307)	(1,143)
Net cash used in investing activities	(4,383,909)	(1,405,330)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	4,559,929	1,374,287
Net increase (decrease) in short-term borrowings	(21,143)	39,962
Repayment of FHLB advances	0	(99,999)
Repayment of long-term debt and lease liabilities	(315)	(289)
Common stock:
Repurchase of common stocks pursuant to the Stock Repurchase Program	0	(145,966)
Stocks tendered for payment of withholding taxes	(14,983)	(7,609)
Cash dividends paid	(48,213)	(41,358)
Net cash provided by financing activities	4,475,275	1,119,028
Effect of exchange rate changes on cash and cash equivalents	138,281	13,492
NET INCREASE IN CASH AND CASH EQUIVALENTS	601,162	(181,107)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	4,017,971	3,261,149
CASH AND CASH EQUIVALENTS, END OF PERIOD	4,619,133	3,080,042
Cash paid during the period for:
Interest	29,680	88,520
Income taxes, net	0	2,904
Noncash investing and financing activities:
Loans transferred from held-for-investment to held-for-sale	145,872	110,223
Loans transferred to other real estate owned (“OREO”) and other nonperforming assets	$ 10,360	$ 23,394

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation East West Bancorp, Inc. (referred to herein on an unconsolidated basis as “East West” and on a consolidated basis as the “Company”) is a registered bank holding company that offers a full range of banking services to individuals and businesses through its subsidiary bank, East West Bank and its subsidiaries (“East West Bank” or the “Bank”). The unaudited interim Consolidated Financial Statements in this Quarterly Report on Form 10-Q (“this Form 10-Q”) include the accounts of East West, East West Bank and East West’s subsidiaries. Intercompany transactions and accounts have been eliminated in consolidation. As of March 31, 2021, East West also has six wholly owned subsidiaries that are statutory business trusts (the “Trusts”). In accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 810, Consolidation , the Trusts are not included on the Consolidated Financial Statements. The unaudited interim Consolidated Financial Statements are presented in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”), applicable guidelines prescribed by regulatory authorities and general practices in the banking industry. They reflect all adjustments that, in the opinion of management, are necessary for fair presentation of the interim Consolidated Financial Statements. Certain items on the Consolidated Financial Statements and notes for the prior periods have been reclassified to conform to the current period presentation. The current period’s results of operations are not necessarily indicative of results that may be expected for any future interim period or for the year as a whole. Events subsequent to the Consolidated Balance Sheet date have been evaluated through the date the Consolidated Financial Statements are issued for inclusion in the accompanying Consolidated Financial Statements. The unaudited interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and notes thereto included in the Company’s annual report on Form 10-K for the year ended December 31, 2020, filed with the U.S. Securities and Exchange Commission on February 26, 2021 (the “Company’s 2020 Form 10-K”).

Current Accounting Developments

Current Accounting Developments	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Current Accounting Developments	Current Accounting Developments New Accounting Pronouncements Adopted Standard Required Date of Adoption Description Effect on Financial Statements Standards Adopted in 2021 ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting and subsequent related ASU 2021-01, Reference Rate Reform (Topic 848): Scope Effective for all entities from the dates of issuance through December 31, 2022. In March 2020, the FASB issued an ASU related to contracts or hedging relationships that reference London Interbank Offered Rate (“LIBOR”) or other reference rates that are expected to be discontinued due to reference rate reform. This ASU provides temporary optional expedients and exceptions regarding the accounting requirements related to the modification of certain contracts, hedging relationships and other transactions that are affected by the reference rate reform. The guidance permits the Company to make a one-time election to sell and/or transfer qualifying held-to-maturity securities, and not to apply modification accounting or remeasure lease payments in lease contracts if the changes to the contract are related to the discontinuation of the reference rate. If certain criteria are met, the amendments also allow exceptions to the de-designation criteria of the hedging relationships and the assessment of hedge effectiveness during the transition period. This one time election may be made at any time after March 12, 2020, but no later than December 31, 2022. In January 2021, the FASB issued ASU 2021-01 as subsequent amendments, which expanded the scope of Topic 848 to include all affected derivatives and clarified certain optional expedients and exceptions regarding the hedge accounting for derivative contracts affected by the discounting transition. The amendments of this guidance could be elected retrospectively or prospectively to new modifications made on or after the date of issuance of this ASU, January 7, 2021. The Company adopted this guidance on a prospective basis in January 2021. At the time of adoption, the guidance did not have a material impact on the Company’s Consolidated Financial Statements. The Company will continue to track the exposure as of each reporting period and to assess the impact as the reference rate transition occurs through the cessation of LIBOR. ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes January 1, 2021 Early adoption is permitted on January 1, 2020. This ASU simplifies the accounting for income taxes by removing certain exceptions to the existing guidance. This includes removing exceptions to: 1) the incremental approach for intraperiod tax allocation, 2) the requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment, 3) the ability not to recognize a deferred tax liability when a foreign equity method investment becomes a subsidiary, and 4) the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. In addition, this ASU simplifies the accounting for income taxes related to franchise taxes, the tax basis of goodwill and the method for recognizing an enacted change in tax laws. This ASU also specifies that an entity is not required to allocate the consolidated amount of tax expense to a legal entity that is not subject to tax in its separate financial statements. This ASU also makes improvements in the accounting for income taxes related to employee stock ownership plans and equity method investments in qualified affordable housing projects. This guidance should be applied on either a retrospective, modified retrospective or prospective basis depending on the amendments. The Company adopted this guidance in January 2021 using the transition guidance prescribed by this ASU. At the time of adoption, this guidance did not have a material impact on the Company’s Consolidated Financial Statements.

Fair Value Measurement and Fair

Fair Value Measurement and Fair Value of Financial Instruments	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurement and Fair Value of Financial Instruments	Fair Value Measurement and Fair Value of Financial Instruments Fair Value Determination Fair value is defined as the price that would be received to sell an asset or the price that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. In determining the fair value of financial instruments, the Company uses various methods including market and income approaches. Based on these approaches, the Company utilizes certain assumptions that market participants would use in pricing an asset or a liability. These inputs can be readily observable, market corroborated or generally unobservable. The Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy noted below is based on the quality and reliability of the information used to determine fair value. The fair value hierarchy gives the highest priority to quoted prices available in active markets and the lowest priority to prices derived from data lacking transparency. The fair value of the Company’s assets and liabilities is classified and disclosed in one of the following three categories: • Level 1 — Valuation is based on quoted prices for identical instruments traded in active markets. • Level 2 — Valuation is based on quoted prices for similar instruments traded in active markets; quoted prices for identical or similar instruments traded in markets that are not active; and model-derived valuations whose inputs are observable and can be corroborated by market data. • Level 3 — Valuation is based on significant unobservable inputs for determining the fair value of assets or liabilities. These significant unobservable inputs reflect assumptions that market participants may use in pricing the assets or liabilities. The classification of assets and liabilities within the hierarchy is based on whether inputs to the valuation methodology used are observable or unobservable, and the significance of those inputs in the fair value measurement. The Company’s assets and liabilities are classified in their entirety based on the lowest level of input that is significant to their fair value measurements. Assets and Liabilities Measured at Fair Value on a Recurring Basis The following section describes the valuation methodologies used by the Company to measure financial assets and liabilities on a recurring basis, as well as the general classification of these instruments pursuant to the fair value hierarchy. Available-for-Sale Debt Securities — When available, the Company uses quoted market prices to determine the fair value of AFS debt securities, which are classified as Level 1. Level 1 AFS debt securities are comprised of U.S. Treasury securities. The fair value of other AFS debt securities is generally determined by independent external pricing service providers who have experience in valuing these securities or by taking the average quoted market prices obtained from independent external brokers. The valuations provided by the third-party pricing service providers are based on observable market inputs, which include benchmark yields, reported trades, issuer spreads, benchmark securities, bids, offers, prepayment expectation and reference data obtained from market research publications. Inputs used by the third-party pricing service providers in valuing collateralized mortgage obligations and other securitization structures also include new issue data, monthly payment information, whole loan collateral performance, tranche evaluation and “To Be Announced” prices. In valuing securities issued by state and political subdivisions, inputs used by third-party pricing service providers also include material event notices. On a monthly basis, the Company validates the valuations provided by third-party pricing service providers to ensure that the fair value determination is consistent with the applicable accounting guidance and the financial instruments are properly classified in the fair value hierarchy. To perform this validation, the Company evaluates the fair values of securities by comparing the fair values provided by the third-party pricing service providers to prices from other available independent sources for the same securities. When 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 documentation received from the third-party pricing service providers regarding the valuation inputs and methodology used for each category of securities. When pricing is unavailable from third-party pricing service providers for certain securities, the Company requests market quotes from various independent external brokers and utilizes the average quoted market prices. These valuations are based on observable inputs in the current marketplace and are classified as Level 2. The Company periodically communicates with the independent external brokers to validate their pricing methodology. Information such as pricing sources, pricing assumptions, data inputs and valuation technique are reviewed. Equity Securities — Equity securities consisted of mutual funds as of both March 31, 2021 and December 31, 2020. 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 — The Company enters into interest rate swap and option contracts that are not designated as hedging instruments with its borrowers to lock in attractive intermediate and long-term interest rates, resulting in the customer obtaining a synthetic fixed-rate loan. To economically hedge against the interest rate risks in the products offered to its customers, the Company enters into mirrored offsetting interest rate contracts with third-party financial institutions. The Company also enters into interest rate swap contracts with institutional counterparties to hedge against certain variable interest rate borrowings. These interest rate swap contracts with institutional counterparties were designated as cash flow hedges. The fair value of the interest rate swaps is determined using the market standard methodology of netting the discounted future fixed cash payments (or receipts) and the discounted expected variable cash receipts (or payments). The fair value of the interest rate options, which consist of floors and caps, is determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates fall below (rise above) the strike rate of the floors (caps). In addition, to comply with the provisions of ASC 820, Fair Value Measurement , the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements of its derivatives. The credit valuation adjustments associated with the Company’s derivatives utilize model-derived credit spreads, which are Level 3 inputs. As of March 31, 2021 and December 31, 2020, the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of these interest rate contracts and has determined that the credit valuation adjustments were not significant to the overall valuation of its derivative portfolios. The Company classifies these derivative instruments as Level 2 due to the observable nature of the significant inputs utilized. Foreign Exchange Contracts — The Company enters into foreign exchange contracts to accommodate the business needs of its customers. For a majority of the foreign exchange contracts entered with its customers, the Company entered into offsetting foreign exchange contracts with third-party financial institutions to manage its exposure. The Company also utilizes foreign exchange contracts that are not designated as hedging instruments to mitigate the economic effect of fluctuations in certain foreign currency on-balance sheet assets and liabilities, primarily foreign currency denominated deposits that it offers to its customers. The fair value is determined at each reporting period based on changes in the foreign exchange rates. These are over-the-counter contracts where quoted market prices are not readily available. Valuation is measured using conventional valuation methodologies with observable market data. Due to the short-term nature of the majority of these contracts, the counterparties’ credit risks are considered nominal and result in no adjustments to the valuation of the foreign exchange contracts. Due to the observable nature of the inputs used in deriving the fair value of these contracts, the valuation of foreign exchange contracts are classified as Level 2. As of March 31, 2021 and December 31, 2020, the Bank held foreign currency non-deliverable forward contracts to hedge its net investment in its China subsidiary, East West Bank (China) Limited, a non-U.S. dollar (“USD”) functional currency subsidiary in China. These foreign currency non-deliverable forward contracts were designated as net investment hedges. The fair value of foreign currency contracts is determined by comparing the contracted foreign exchange rate to the current market foreign exchange rate. Key inputs of the current market exchange rate include spot rates and forward rates of the contractual currencies. Foreign exchange forward curves are used to determine which forward rate pertains to a specific maturity. Due to the observable nature of the inputs used in deriving the estimated fair value, these instruments are classified as Level 2. Credit Contracts — The Company may periodically enter into credit risk participation agreements (“RPAs”) to manage the credit exposure on interest rate contracts associated with the syndicated loans. The Company may enter into protection sold or protection purchased RPAs with institutional counterparties. The fair value of RPAs is calculated by determining the total expected asset or liability exposure of the derivatives to the borrowers and applying the borrowers’ credit spread to that exposure. Total expected exposure incorporates both the current and potential future exposure of the derivatives, derived from using observable inputs, such as yield curves and volatilities. The majority of the inputs used to value the RPAs are observable; accordingly, RPAs fall within Level 2. Equity Contracts — As part of the loan origination process, the Company periodically obtains warrants to purchase preferred and/or common stock of technology and life sciences companies to which it provides loans. As of March 31, 2021, the warrants included on the Consolidated Financial Statements were only from private companies. As of December 31, 2020, the warrants included on the Consolidated Financial Statements were from both public and private companies. The Company values these warrants based on the Black-Scholes option pricing model. For warrants from public companies, the model uses the underlying stock price, stated strike price, warrant expiration date, risk-free interest rate based on a duration-matched U.S. Treasury rate, and market-observable company-specific option volatility as inputs to value the warrants. Due to the observable nature of the inputs used in deriving the estimated fair value, warrants from public companies are classified as Level 2. For warrants from private companies, the model uses inputs such as the offering price observed in the most recent round of funding, stated strike price, warrant expiration date, risk-free interest rate based on duration-matched U.S. Treasury rate and option volatility. The Company applies proxy volatilities based on the industry sectors of the private companies. The model values are then adjusted for a general lack of liquidity due to the private nature of the underlying companies. Since both option volatility and liquidity discount assumptions are subject to management’s judgment, measurement uncertainty is inherent in the valuation of private companies’ warrants. Due to the unobservable nature of the option volatility and liquidity discount assumptions used in deriving the estimated fair value, warrants from private companies are classified as Level 3. Given that the Company holds long positions in all warrants, an increase in volatility assumption would generally result in an increase in fair value. A higher liquidity discount would generally result in a decrease in fair value. On a quarterly basis, the changes in the fair value of warrants from private companies are reviewed for reasonableness, and a measurement uncertainty analysis on the option volatility and liquidity discount assumptions is performed. Commodity Contracts — The Company enters into energy commodity contracts in the form of swaps and options with its commercial loan customers to allow them to hedge against the risk of fluctuation in energy commodity prices. The fair value of the commodity option contracts is determined using the Black-Scholes model and assumptions that include expectations of future commodity price and volatility. The future commodity contract price is derived from observable inputs such as the market price of the commodity. Commodity swaps are structured as an exchange of fixed cash flows for floating cash flows. The fixed cash flows are predetermined based on the known volumes and fixed price as specified in the swap agreement. The floating cash flows are correlated with the change of forward commodity prices, which is derived from market corroborated futures settlement prices. The fair value of the commodity swaps is determined using the market standard methodology of netting the discounted future fixed cash payments (or receipts) and the discounted expected variable cash receipts (or payments) based on the market prices of the commodity. As a result, the Company classifies these derivative instruments as Level 2 due to the observable nature of the significant inputs utilized. The following tables present financial assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2021 and December 31, 2020: ($ in thousands) Assets and Liabilities Measured at Fair Value on a Recurring Basis Quoted Prices in Significant Significant Total AFS debt securities: U.S. Treasury securities $ 826,342 $ — $ — $ 826,342 U.S. government agency and U.S. government-sponsored enterprise debt securities — 1,194,005 — 1,194,005 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities — 1,169,391 — 1,169,391 Residential mortgage-backed securities — 2,247,406 — 2,247,406 Municipal securities — 420,065 — 420,065 Non-agency mortgage-backed securities: Commercial mortgage-backed securities — 281,027 — 281,027 Residential mortgage-backed securities — 523,500 — 523,500 Corporate debt securities — 496,643 — 496,643 Foreign government bonds — 276,328 — 276,328 Asset-backed securities — 63,040 — 63,040 Collateralized loan obligations (“CLOs”) — 291,466 — 291,466 Total AFS debt securities $ 826,342 $ 6,962,871 $ — $ 7,789,213 Investments in tax credit and other investments: Equity securities (1) $ 22,233 $ 4,460 $ — $ 26,693 Total investments in tax credit and other investments $ 22,233 $ 4,460 $ — $ 26,693 Derivative assets: Interest rate contracts $ — $ 319,049 $ — $ 319,049 Foreign exchange contracts — 39,562 — 39,562 Credit contracts — 5 — 5 Equity contracts — — 272 272 Commodity contracts — 98,429 — 98,429 Gross derivative assets $ — $ 457,045 $ 272 $ 457,317 Netting adjustments (2) $ — $ (108,235) $ — $ (108,235) Net derivative assets $ — $ 348,810 $ 272 $ 349,082 Derivative liabilities: Interest rate contracts $ — $ 230,290 $ — $ 230,290 Foreign exchange contracts — 27,287 — 27,287 Credit contracts — 153 — 153 Commodity contracts — 86,405 — 86,405 Gross derivative liabilities $ — $ 344,135 $ — $ 344,135 Netting adjustments (2) $ — $ (186,687) $ — $ (186,687) Net derivative liabilities $ — $ 157,448 $ — $ 157,448 (1) Equity securities consist of mutual funds with readily determinable fair values. The Company invested in these mutual funds for CRA purposes. (2) Represents balance sheet netting of derivative assets and liabilities and related cash collateral under master netting agreements or similar agreements. See Note 6 — Derivatives to the Consolidated Financial Statements in this Form 10-Q for additional information. ($ in thousands) Assets and Liabilities Measured at Fair Value on a Recurring Basis Quoted Prices in Significant Significant Total AFS debt securities: U.S. Treasury securities $ 50,761 $ — $ — $ 50,761 U.S. government agency and U.S. government-sponsored enterprise debt securities — 814,319 — 814,319 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities — 1,153,770 — 1,153,770 Residential mortgage-backed securities — 1,660,894 — 1,660,894 Municipal securities — 396,073 — 396,073 Non-agency mortgage-backed securities: Commercial mortgage-backed securities — 239,842 — 239,842 Residential mortgage-backed securities — 289,775 — 289,775 Corporate debt securities — 405,968 — 405,968 Foreign government bonds — 182,531 — 182,531 Asset-backed securities — 63,231 — 63,231 CLOs — 287,494 — 287,494 Total AFS debt securities $ 50,761 $ 5,493,897 $ — $ 5,544,658 Investments in tax credit and other investments: Equity securities (1) $ 22,548 $ 8,724 $ — $ 31,272 Total investments in tax credit and other investments $ 22,548 $ 8,724 $ — $ 31,272 Derivative assets: Interest rate contracts $ — $ 489,132 $ — $ 489,132 Foreign exchange contracts — 30,300 — 30,300 Credit contracts — 13 — 13 Equity contracts — 585 273 858 Commodity contracts — 82,451 — 82,451 Gross derivative assets $ — $ 602,481 $ 273 $ 602,754 Netting adjustments (2) $ — $ (101,512) $ — $ (101,512) Net derivative assets $ — $ 500,969 $ 273 $ 501,242 Derivative liabilities: Interest rate contracts $ — $ 317,698 $ — $ 317,698 Foreign exchange contracts — 22,759 — 22,759 Credit contracts — 206 — 206 Commodity contracts — 84,165 — 84,165 Gross derivative liabilities $ — $ 424,828 $ — $ 424,828 Netting adjustments (2) $ — $ (184,697) $ — $ (184,697) Net derivative liabilities $ — $ 240,131 $ — $ 240,131 (1) Equity securities consist of mutual funds with readily determinable fair values. The Company invested in these mutual funds for CRA purposes. (2) Represents balance sheet netting of derivative assets and liabilities and related cash collateral under master netting agreements or similar agreements. See Note 6 — Derivatives to the Consolidated Financial Statements in this Form 10-Q for additional information. For the three months ended March 31, 2021 and 2020, Level 3 fair value measurements that were measured on a recurring basis consisted of warrants issued by private companies. The following table provides a reconciliation of the beginning and ending balances of these equity warrants for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 2020 Equity Contracts Beginning balance $ 273 $ 421 Total (losses) gains included in earnings (1) (1) 292 Ending balance $ 272 $ 713 (1) Includes unrealized (losses) gains of $(1) thousand and $292 thousand for the three months ended March 31, 2021 and 2020, respectively. The realized/unrealized gains (losses) of equity warrants are included in Lending fees on the Consolidated Statement of Income. The following table presents quantitative information about the significant unobservable inputs used in the valuation of Level 3 fair value measurements as of March 31, 2021 and December 31, 2020, respectively. The significant unobservable inputs presented in the table below are those that the Company considers significant to the fair value of the Level 3 assets. The Company considers unobservable inputs to be significant if, by their exclusion, the fair value of the Level 3 assets would be impacted by a predetermined percentage change. ($ in thousands) Fair Value Valuation Unobservable Range of Inputs Weighted- Average (1) March 31, 2021 Derivative assets: Equity contracts $ 272 Black-Scholes option pricing model Equity volatility 48% — 56% 52% Liquidity discount 47% 47% December 31, 2020 Derivative assets: Equity contracts $ 273 Black-Scholes option pricing model Equity volatility 46% — 61% 53% Liquidity discount 47% 47% (1) Weighted-average is calculated based on the fair value of equity warrants as of March 31, 2021 and December 31, 2020. 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 impairment on certain individually evaluated loans held-for-investment and investments in qualified affordable housing partnerships, tax credit and other investments, 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 an individually evaluated loan is collateral-dependent, 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 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, which includes the quarterly review of the financial statements, the annual review of tax returns of the investment entity, the annual review of the 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 when the investment was made. The Company assesses its tax credit and other investments for possible other-than-temporary impairment (“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; and • other factors that raise doubt about the investee’s ability to continue as a going concern, such as negative cash flows from operations and the continuing prospects of the underlying operations of the investment. All available evidence is considered in assessing whether a decline in value is other-than-temporary. Generally, none of the aforementioned factors are individually conclusive and the relative importance placed on individual facts may vary depending on the situation. In accordance with ASC 323-10-35-32, an impairment charge would only be recognized in earnings for a decline in value that is determined to be other-than-temporary. Other Real Estate Owned — The Company’s OREO represents properties acquired through foreclosure, or through full or partial satisfaction of loans held-for-investment. These OREO properties are recorded at estimated fair value less the costs to sell at the time of foreclosure and at the lower of cost or estimated fair value less the costs to sell subsequent to acquisition. On a monthly basis, the current fair market value of each OREO property is reviewed to ensure that the current carrying value is appropriate. OREO properties are classified as Level 3. Other Nonperforming Assets — Other nonperforming assets are recorded at fair value upon transfers from loans to foreclosed assets. Subsequently, foreclosed assets are recorded at the lower of carrying value or fair value. Fair value is based on independent market prices, appraised values of the collateral or management’s estimates of the foreclosed asset. The Company records an impairment when the foreclosed asset’s fair value declines below its carrying value. Other nonperforming assets are classified as Level 3. The following tables present the carrying amounts of assets that were still held and had fair value changes measured on a nonrecurring basis as of March 31, 2021 and December 31, 2020: ($ in thousands) Assets Measured at Fair Value on a Nonrecurring Basis Quoted Prices in Significant Significant Fair Value Loans held-for-investment: Commercial: Commercial and industrial (“C&I”) $ — $ — $ 143,630 $ 143,630 Commercial real estate (“CRE”): CRE — — 47,639 47,639 Multifamily residential — — 2,332 2,332 Construction and land — — 4,191 4,191 Total commercial — — 197,792 197,792 Consumer: Residential mortgage: Home equity lines of credit (“HELOCs”) — — 4,791 4,791 Total consumer — — 4,791 4,791 Total loans held-for-investment $ — $ — $ 202,583 $ 202,583 ($ in thousands) Assets Measured at Fair Value on a Nonrecurring Basis Quoted Prices in Significant Significant Fair Value Loans held-for-investment: Commercial: C&I $ — $ — $ 143,331 $ 143,331 CRE: CRE — — 42,894 42,894 Total commercial — — 186,225 186,225 Consumer: Residential mortgage: HELOCs — — 1,146 1,146 Other consumer — — 2,491 2,491 Total consumer — — 3,637 3,637 Total loans held-for-investment $ — $ — $ 189,862 $ 189,862 Investments in tax credit and other investments, net $ — $ — $ 3,140 $ 3,140 OREO (1) $ — $ — $ 15,824 $ 15,824 (1) Amounts are included in Other assets on the Consolidated Balance Sheet and represent the carrying value of OREO properties that were written down subsequent to their initial classification as OREO. The following table presents the increase (decrease) in fair value of assets for which a nonrecurring fair value adjustment has been recognized for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 2020 Loans held-for-investment: Commercial: C&I $ (5,309) $ (21,501) CRE: CRE (7,062) (5) Multifamily residential (16) — Construction and land (71) — Total commercial (12,458) (21,506) Consumer: Residential mortgage: HELOCs (37) (193) Other consumer — 2,491 Total consumer (37) 2,298 Total loans held-for-investment $ (12,495) $ (19,208) Investments in tax credit and other investments, net $ — $ 150 Other nonperforming assets $ (3,890) $ (300) 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 March 31, 2021 and December 31, 2020: ($ in thousands) Fair Value Valuation Unobservable Range of Weighted- Average of Inputs (1) March 31, 2021 Loans held-for-investment $ 108,918 Discounted cash flows Discount 4% — 15% 11% $ 24,356 Fair value of collateral Discount 10% — 20% 15% $ 9,902 Fair value of collateral Contract value NM NM $ 59,407 Fair value of property Selling cost 8% — 26% 9% December 31, 2020 Loans held-for-investment $ 104,783 Discounted cash flows Discount 3% — 15% 11% $ 22,207 Fair value of collateral Discount 10% — 26% 15% $ 15,879 Fair value of collateral Contract value NM NM $ 46,993 Fair value of property Selling cost 7% — 26% 10% Investments in tax credit and other investments, net $ 3,140 Individual analysis of each investment Expected future tax benefits and distributions NM NM OREO $ 15,824 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 March 31, 2021 and December 31, 2020. Disclosures about Fair Value of Financial Instruments The following tables present the fair value estimates for financial instruments as of March 31, 2021 and December 31, 2020, excluding financial instruments recorded at fair value on a recurring basis as they are included in the tables presented elsewhere in this Note. The carrying amounts in the following tables are recorded on the Consolidated Balance Sheet under the indicated captions, except for accrued interest receivable and mortgage servicing rights that are included in Other assets , and accrued interest payable that is included in Accrued expenses and other liabilities . These financial assets and liabilities are measured at amortized cost basis on the Company’s Consolidated Balance Sheet. ($ in thousands) March 31, 2021 Carrying Level 1 Level 2 Level 3 Estimated Financial assets: Cash and cash equivalents $ 4,619,133 $ 4,619,133 $ — $ — $ 4,619,133 Interest-bearing deposits with banks $ 741,923 $ — $ 741,923 $ — $ 741,923 Resale agreements $ 2,160,038 $ — $ 2,152,392 $ — $ 2,152,392 Restricted equity securities, at cost $ 83,250 $ — $ 83,250 $ — $ 83,250 Loans held-for-investment, net $ 38,981,242 $ — $ — $ 38,922,550 $ 38,922,550 Mortgage servicing rights $ 5,506 $ — $ — $ 8,740 $ 8,740 Accrued interest receivable $ 149,953 $ — $ 149,953 $ — $ 149,953 Financial liabilities: Demand, checking, savings and money market deposits $ 40,748,303 $ — $ 40,748,303 $ — $ 40,748,303 Time deposits $ 8,798,833 $ — $ 8,811,048 $ — $ 8,811,048 FHLB advances $ 653,035 $ — $ 657,460 $ — $ 657,460 Repurchase agreements $ 300,000 $ — $ 316,099 $ — $ 316,099 Long-term debt $ 147,445 $ — $ 151,015 $ — $ 151,015 Accrued interest payable $ 9,966 $ — $ 9,966 $ — $ 9,966 ($ in thousands) December 31, 2020 Carrying Level 1 Level 2 Level 3 Estimated Financial assets: Cash and cash equivalents $ 4,017,971 $ 4,017,971 $ — $ — $ 4,017,971 Interest-bearing deposits with banks $ 809,728 $ — $ 809,728 $ — $ 809,728 Resale agreements $ 1,460,000 $ — $ 1,464,635 $ — $ 1,464,635 Restricted equity securities, at cost $ 83,046 $ — $ 83,046 $ — $ 83,046 Loans held-for-sale $ 1,788 $ — $ 1,788 $ — $ 1,788 Loans held-for-investment, net $ 37,770,972 $ — $ — $ 37,803,940 $ 37,803,940 Mortgage servicing rights $ 5,522 $ — $ — $ 8,435 $ 8,435 Accrued interest receivable $ 150,140 $ — $ 150,140 $ — $ 150,140 Financial liabilities: Demand, checking, savings and money market deposits $ 35,862,403 $ — $ 35,862,403 $ — $ 35,862,403 Time deposits $ 9,000,349 $ — $ 9,016,884 $ — $ 9,016,884 Short-term borrowings $ 21,009 $ — $ 21,009 $ — $ 21,009 FHLB advances $ 652,612 $ — $ 659,631 $ — $ 659,631 Repurchase agreements $ 300,000 $ — $ 317,850 $ — $ 317,850 Long-term debt $ 147,376 $ — $ 150,131 $ — $ 150,131 Accrued interest payable $ 11,956 $ — $ 11,956 $ — $ 11,956

Assets Purchased under Resale A

Assets Purchased under Resale Agreements and Sold under Repurchase Agreements	3 Months Ended
	Mar. 31, 2021
RESALE AND REPURCHASE AGREEMENTS [Abstract]
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 In resale agreements, the Company is exposed to credit risk for both counterparties and the underlying collateral. The Company manages credit exposure from certain transactions by entering into master netting agreements and collateral arrangements with counterparties. The relevant agreements allow for the 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 March 31, 2021 and December 31, 2020. Securities Purchased under Resale Agreements — Total securities purchased under resale agreements were $1.31 billion and $1.16 billion as of March 31, 2021 and December 31, 2020, respectively. The weighted-average yields were 1.57% and 2.50% for the three months ended March 31, 2021 and 2020, respectively. Loans Purchased under Resale Agreements — The Company participated in resale agreements collateralized with loans with multiple counterparties starting in the fourth quarter of 2020. Total loans purchased under resale agreements were $850.0 million and $300.0 million as of March 31, 2021 and December 31, 2020, respectively. The weighted-average yield was 2.02% for the three months ended March 31, 2021. Assets Sold under Repurchase Agreements — As of March 31, 2021, the collateral for the repurchase agreements were comprised of U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities and U.S. Treasury securities. Gross repurchase agreements were $300.0 million as of both March 31, 2021 and December 31, 2020. The weighted-average interest rates were 2.67% and 4.10% for the three months ended March 31, 2021 and 2020, respectively. As of March 31, 2021, all repurchase agreements will mature in 2023. Balance Sheet Offsetting The Company’s resale and repurchase agreements are transacted under legally enforceable master repurchase agreements that, in the event of default by the counterparty, provide the Company the right to liquidate securities held and to offset receivables and payables with the same counterparty. The Company nets resale and repurchase transactions with the same counterparty on the Consolidated Balance Sheet when it has a legally enforceable master netting agreement and the transactions are eligible for netting under ASC 210-20-45-11, Balance Sheet Offsetting : Repurchase and Reverse Repurchase Agreements . Collateral received includes securities that are not recognized on the Consolidated Balance Sheet. Collateral pledged consists of securities that are not netted on the Consolidated Balance Sheet against the related collateralized liability. Collateral received or pledged in resale and repurchase agreements with other financial institutions may also be sold or re-pledged by the secured party, and is usually delivered to and held by the third-party trustees. The following tables present the resale and repurchase agreements included on the Consolidated Balance Sheet as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 Gross Gross Amounts Net Amounts of Gross Amounts Not Offset on the Assets Net Collateral Received Resale agreements $ 2,160,038 $ — $ 2,160,038 $ (2,138,721) (1) $ 21,317 Gross Gross Amounts Net Amounts of Gross Amounts Not Offset on the Liabilities Net Collateral Pledged Repurchase agreements $ 300,000 $ — $ 300,000 $ (300,000) (2) $ — ($ in thousands) December 31, 2020 Gross Gross Amounts Net Amounts of Gross Amounts Not Offset on the Assets Net Collateral Received Resale agreements $ 1,460,000 $ — $ 1,460,000 $ (1,458,700) (1) $ 1,300 Gross Gross Amounts Net Amounts of Gross Amounts Not Offset on the Liabilities Net Collateral Pledged Repurchase agreements $ 300,000 $ — $ 300,000 $ (300,000) (2) $ — (1) Represents the fair value of securities the Company has received under resale agreements, limited to the amount of the recognized asset due from each counterparty for presentation purposes. The application of collateral cannot reduce the net position below zero. Therefore, excess collateral, if any, is not reflected above. (2) Represents the fair value of securities the Company has pledged under repurchase agreements, limited to the amount of the recognized liability due to each counterparty for presentation purpose. The application of collateral cannot reduce the net position below zero. Therefore, excess collateral, if any, is not reflected above. In addition to the amounts included in the tables above, the Company also has balance sheet netting related to derivatives. Refer to Note 6 — Derivatives to the Consolidated Financial Statements in this Form 10-Q for additional information.

Securities

Securities	3 Months Ended
	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Securities	Securities The following tables present the amortized cost, gross unrealized gains and losses and fair value by major categories of AFS debt securities as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 Amortized Gross Gross Fair AFS debt securities: U.S. Treasury securities $ 841,711 $ 328 $ (15,697) $ 826,342 U.S. government agency and U.S. government-sponsored enterprise debt securities 1,236,446 5,145 (47,586) 1,194,005 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 1,178,238 16,407 (25,254) 1,169,391 Residential mortgage-backed securities 2,271,645 17,026 (41,265) 2,247,406 Municipal securities 417,676 7,348 (4,959) 420,065 Non-agency mortgage-backed securities: Commercial mortgage-backed securities 281,099 4,311 (4,383) 281,027 Residential mortgage-backed securities 525,560 1,599 (3,659) 523,500 Corporate debt securities 517,309 4,677 (25,343) 496,643 Foreign government bonds 278,100 320 (2,092) 276,328 Asset-backed securities 62,762 292 (14) 63,040 CLOs 294,000 — (2,534) 291,466 Total AFS debt securities $ 7,904,546 $ 57,453 $ (172,786) $ 7,789,213 ($ in thousands) December 31, 2020 Amortized Gross Gross Fair AFS debt securities: U.S. Treasury securities $ 50,310 $ 451 $ — $ 50,761 U.S. government agency and U.S. government-sponsored enterprise debt securities 806,814 8,765 (1,260) 814,319 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 1,125,174 34,306 (5,710) 1,153,770 Residential mortgage-backed securities 1,634,553 27,952 (1,611) 1,660,894 Municipal securities 382,573 13,588 (88) 396,073 Non-agency mortgage-backed securities: Commercial mortgage-backed securities 234,965 6,107 (1,230) 239,842 Residential mortgage-backed securities 288,520 1,761 (506) 289,775 Corporate debt securities 406,323 3,493 (3,848) 405,968 Foreign government bonds 183,828 163 (1,460) 182,531 Asset-backed securities 63,463 10 (242) 63,231 CLOs 294,000 — (6,506) 287,494 Total AFS debt securities $ 5,470,523 $ 96,596 $ (22,461) $ 5,544,658 As of March 31, 2021 and December 31, 2020, the amortized cost of AFS debt securities excluded accrued interest receivables of $22.9 million and $22.3 million, respectively, which are included in Other assets on the Consolidated Balance Sheet. For the Company’s accounting policy related to AFS debt securities’ accrued interest receivable, see Note 1 — Summary of Significant Accounting Policies — Allowance for Credit Losses on Available-for-Sale Debt Securities to the Consolidated Financial Statements in the Company’s 2020 Form 10-K. Unrealized Losses The following tables present the fair value and the associated gross unrealized losses of the Company’s AFS debt securities, aggregated by investment category and the length of time that the securities have been in a continuous unrealized loss position as of March 31, 2021 and December 31, 2020. ($ in thousands) March 31, 2021 Less Than 12 Months 12 Months or More Total Fair Gross Fair Gross Fair Gross AFS debt securities: U.S. Treasury securities $ 775,801 $ (15,697) $ — $ — $ 775,801 $ (15,697) U.S. government agency and U.S. government sponsored enterprise debt securities 954,894 (47,586) — — 954,894 (47,586) U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 615,193 (25,203) 3,474 (51) 618,667 (25,254) Residential mortgage-backed securities 1,464,574 (41,264) 358 (1) 1,464,932 (41,265) Municipal securities 199,225 (4,959) — — 199,225 (4,959) Non-agency mortgage-backed securities: Commercial mortgage-backed securities 114,971 (4,374) 15,578 (9) 130,549 (4,383) Residential mortgage-backed securities 391,444 (3,659) — — 391,444 (3,659) Corporate debt securities 347,934 (25,316) 9,974 (27) 357,908 (25,343) Foreign government bonds 155,299 (2,092) — — 155,299 (2,092) Asset-backed securities 11,904 (14) — — 11,904 (14) CLOs — — 291,466 (2,534) 291,466 (2,534) Total AFS debt securities $ 5,031,239 $ (170,164) $ 320,850 $ (2,622) $ 5,352,089 $ (172,786) ($ in thousands) December 31, 2020 Less Than 12 Months 12 Months or More Total Fair Gross Fair Gross Fair Gross AFS debt securities: U.S. Treasury securities $ 352,521 $ (1,260) $ — $ — $ 352,521 $ (1,260) U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 292,596 (5,656) 3,543 (54) 296,139 (5,710) Residential mortgage-backed securities 342,561 (1,611) — — 342,561 (1,611) Municipal securities 24,529 (88) — — 24,529 (88) Non-agency mortgage-backed securities: Commercial mortgage-backed securities 58,738 (1,230) 7,920 — 66,658 (1,230) Residential mortgage-backed securities 90,156 (506) — — 90,156 (506) Corporate debt securities 251,674 (3,645) 9,798 (203) 261,472 (3,848) Foreign government bonds 106,828 (1,460) — — 106,828 (1,460) Asset-backed securities — — 34,104 (242) 34,104 (242) CLOs — — 287,494 (6,506) 287,494 (6,506) Total AFS debt securities $ 1,519,603 $ (15,456) $ 342,859 $ (7,005) $ 1,862,462 $ (22,461) As of March 31, 2021, the Company had a total of 291 AFS debt securities in a gross unrealized loss position with no credit impairment that were comprised primarily of 112 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities, 41 U.S. government agency and U.S. government sponsored enterprise debt securities and 26 corporate debt securities. In comparison, as of December 31, 2020, the Company had a total of 104 AFS debt securities in a gross unrealized loss position with no credit impairment that were comprised primarily of 46 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities and 17 corporate debt securities. Allowance for Credit Losses Each reporting period, the Company assesses each AFS debt security that is in an unrealized loss position to determine whether the decline in fair value below the amortized cost basis resulted from a credit loss or other factors. For a discussion of the factors and criteria the Company uses in analyzing securities for impairment related to credit losses, see Note 1 — Summary of Significant Accounting Policies — Allowance for Credit Losses on Available-for-Sale Debt Securities to the Consolidated Financial Statements in the Company’s 2020 Form 10-K. The gross unrealized losses presented in the above tables were primarily attributable to yield curve movements and widened spreads. Securities that were in unrealized loss positions as of March 31, 2021 were mainly comprised of the following: • U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities — The market value decline as of March 31, 2021 was primarily due to interest rate movement. Since these securities (issued by Fannie Mae, Ginnie Mae and Freddie Mac) are guaranteed or sponsored by agencies of the U.S. government, and the credit profiles are strong (rated Aaa, AA+ and AAA by Moody’s Investors Service (“Moody’s”), Standard and Poor's (“S&P”) and Fitch Ratings (“Fitch”), respectively), the Company expects to receive all contractual interest payments on-time, and believes the risk of credit losses on these securities is remote. • U.S. government agency and U.S. government-sponsored enterprise debt securities — The market value decline as of March 31, 2021 was primarily due to interest rate movement. The securities consisted of the debt securities issued by: – Federal Farm Credit Bank, Fannie Mae, Freddie Mac, and U.S. International Development Finance Corporation (rated Aaa, AA+ and AAA rated by Moody’s, S&P and Fitch, respectively). – FHLB debt obligations (rated Aaa and AA+ rated by Moody’s and S&P, respectively). As these securities are guaranteed or sponsored by the U.S. government and the credit profiles are strong, the Company expects to receive all contractual interest payments on time, and believes the risk of credit losses on these securities is remote. • Corporate debt securities — The market value decline as of March 31, 2021 was primarily due to interest rate movement and the widening in spreads. Since credit profiles of the securities are strong (rated BBB- or higher by Moody’s, S&P, Kroll Bond Rating Agency and Fitch), and the contractual payments from these bonds have been and are expected to be received on time, the Company believes that the risk of credit losses on these securities is remote. The impact of the Coronavirus Disease 2019 (“COVID-19”) pandemic has been muted by the government’s aggressive monetary policy, including benchmark rate cuts, and various relief measures that contributed to the gradual and steady recovery of the market to pre-pandemic levels. Overall, the Company believes that the credit support levels of the AFS debt securities are strong and, based on current assessments and macroeconomic forecasts, expects that full contractual cash flows will be received even if near-term credit performance could possibly suffer from future unpredictable impacts of the COVID-19 pandemic. As of March 31, 2021 and December 31, 2020, the Company had the intent to hold the AFS debt securities with unrealized losses through the anticipated recovery period and it was more-likely-than-not that the Company will not have to sell these securities before recovery of their amortized cost. The issuers of these securities have not, to the Company’s knowledge, established any cause for default on these securities. As a result, the Company expects to recover the entire amortized cost basis of these securities. Accordingly, there was no allowance for credit losses as of March 31, 2021 and December 31, 2020 provided against these securities. In addition, there was no provision for credit losses recognized for the three months ended March 31, 2021 and 2020. Realized Gains and Losses The following table presents the gross realized gains and tax expense related to the sales of AFS debt securities for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 2020 Gross realized gains $ 192 $ 1,529 Related tax expense $ 57 $ 452 Contractual Maturities of Available-for-Sale Debt Securities The following table presents the contractual maturities of AFS debt securities as of March 31, 2021. Expected maturities will differ from contractual maturities on certain securities as the issuers and borrowers of the underlying collateral may have the right to call or prepay obligations with or without prepayment penalties. ($ in thousands) Amortized Cost Fair Value Due within one year $ 1,403,404 $ 1,347,808 Due after one year through five years 688,387 681,602 Due after five years through ten years 1,427,893 1,414,362 Due after ten years 4,384,862 4,345,441 Total AFS debt securities $ 7,904,546 $ 7,789,213 As of March 31, 2021 and December 31, 2020, AFS debt securities with fair valu e of $590.9 million and $588.5 million, respectively, were pledged to secure public deposits, repurchase agreements and for other purposes required or permitted by law. Restricted Equity Securities The following table presents the restricted equity securities on the Consolidated Balance Sheet as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 December 31, 2020 Federal Reserve Bank of San Francisco (“FRBSF”) stock $ 59,453 $ 59,249 FHLB stock 23,797 23,797 Total restricted equity securities $ 83,250 $ 83,046

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives The Company uses derivatives to manage exposure to market risk, primarily interest rate or foreign currency risk, as well as to assist customers with their risk management objectives. The Company’s goal is to manage interest rate sensitivity and volatility so that movements in interest rates do not significantly affect earnings or capital. The Company also uses foreign exchange contracts to manage the foreign exchange rate risk associated with certain foreign currency-denominated assets and liabilities, as well as the Bank’s investment in East West Bank (China) Limited. The Company recognizes all derivatives on the Consolidated Balance Sheet at fair value. While the Company designates certain derivatives as hedging instruments in a qualifying hedge accounting relationship, other derivatives consist of economic hedges. For additional information on the Company’s derivatives and hedging activities, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Derivatives to the Consolidated Financial Statements of the Company’s 2020 Form 10-K. The following table presents the total notional amounts and gross fair values of the Company’s derivatives, as well as the balance sheet netting adjustments on an aggregate basis as of March 31, 2021 and December 31, 2020. The derivative assets and liabilities are presented on a gross basis prior to the application of bilateral collateral and master netting agreements, but after the variation margin payments with central clearing organizations have been applied as settlement, as applicable. Total derivative assets and liabilities are adjusted to take into consideration the effects of legally enforceable master netting agreements and cash collateral received or paid as of March 31, 2021 and December 31, 2020. The resulting net derivative asset and liability fair values are included in Other assets and Accrued expenses and other liabilities , respectively, on the Consolidated Balance Sheet. ($ in thousands) March 31, 2021 December 31, 2020 Notional Fair Value Notional Fair Value Derivative Derivative Derivative Derivative Derivatives designated as hedging instruments: Cash flow hedges: Interest rate contracts $ 275,000 $ — $ 1,258 $ 275,000 $ — $ 1,864 Net investment hedges: Foreign exchange contracts 83,936 908 — 84,269 — 235 Total derivatives designated as hedging instruments $ 358,936 $ 908 $ 1,258 $ 359,269 $ — $ 2,099 Derivatives not designated as hedging instruments: Interest rate contracts $ 17,891,960 $ 319,049 $ 229,032 $ 18,155,678 $ 489,132 $ 315,834 Foreign exchange contracts 4,036,958 38,654 27,287 3,108,488 30,300 22,524 Credit contracts 76,992 5 153 76,992 13 206 Equity contracts — 272 — — 858 — Commodity contracts — 98,429 86,405 — 82,451 84,165 Total derivatives not designated as hedging instruments $ 22,005,910 $ 456,409 $ 342,877 $ 21,341,158 $ 602,754 $ 422,729 Gross derivative assets/liabilities $ 457,317 $ 344,135 $ 602,754 $ 424,828 Less: Master netting agreements (100,454) (100,454) (93,063) (93,063) Less: Cash collateral received/paid (7,781) (86,233) (8,449) (91,634) Net derivative assets/liabilities $ 349,082 $ 157,448 $ 501,242 $ 240,131 (1) The Company held equity contracts in 18 private companies as of March 31, 2021. In comparison, the Company held equity contracts in two public companies and 17 private companies as of December 31, 2020. (2) The notional amount of the Company’s commodity contracts entered with its customers totaled 8,258 thousand barrels of crude oil and 102,996 thousand units of natural gas, measured in million British thermal units (“MMBTUs”) as of March 31, 2021. In comparison, the notional amount of the Company’s commodity contracts entered with its customers totaled 6,321 thousand barrels of crude oil and 109,635 thousand MMBTUs of natural gas as of December 31, 2020. The Company simultaneously entered into the offsetting commodity contracts with mirrored terms with third-party financial institutions. Derivatives Designated as Hedging Instruments Fair Value Hedges — The Company entered into interest rate swaps designated as fair value hedges to hedge changes in the fair value of certain certificates of deposit due to changes in the benchmark interest rate. The interest rate swaps involved the exchange of variable-rate payments over the life of the agreements without exchanging the underlying notional amounts. During the fourth quarter of 2020, both the hedging interest rate swaps and hedged certificates of deposit were called. As of both March 31, 2021 and December 31, 2020, there were no fair value hedges or hedged certificates of deposit outstanding. There were no gains or losses recognized on the Consolidated Statement of Income related to the derivatives designated as fair value hedges for the three months ended March 31, 2021. The net gains recognized on interest rate swaps were $2.0 million and the net losses recognized on certificates of deposit were $1.4 million, both recorded in interest expense on the Consolidated Statement of Income for the three months ended March 31, 2020. Cash Flow Hedges — The Company entered into interest rate swaps that were designated and qualified as cash flow hedges to limit the exposure to the variability in interest payments on certain floating rate borrowings. For cash flow hedges, the entire change in the fair value of the hedging instruments is recognized in AOCI and reclassified to earnings in the same period when the hedged cash flows impact earnings. Reclassified gains and losses on interest rate swaps are recorded in the same line item as the interest payments of the hedged long-term borrowings within Interest expense in the Consolidated Statements of Income. Considering the interest rates, yield curve and notional amounts as of March 31, 2021, the Company expected to reclassify an estimated $560 thousand of after-tax net losses on derivative instruments designated as cash flow hedges from AOCI into earnings during the next 12 months. The following table presents the pre-tax changes in AOCI from cash flow hedges for the three months ended March 31, 2021 and 2020. The after-tax impact of cash flow hedges on AOCI is shown in Note 13 — Accumulated Other Comprehensive Income (Loss) to the Consolidated Financial Statements in this Form-10-Q. ($ in thousands) Three Months Ended March 31, 2021 2020 Gains recognized in AOCI $ 426 $ — (Losses) reclassified from AOCI to interest expense $ (177) $ — Net Investment Hedges — ASC 830-20, Foreign Currency Matters — Foreign Currency Transactions and ASC 815, Derivatives and Hedging , allow hedging of the foreign currency risk of a net investment in a foreign operation. The Company enters into foreign currency forward contracts to hedge a portion of the Bank’s investment in East West Bank (China) Limited, a non-USD functional currency subsidiary in China. The hedging instruments designated as net investment hedges involve hedging the risk of changes in the USD equivalent value of a designated monetary amount of the Bank’s net investment in East West Bank (China) Limited, against the risk of adverse changes in the foreign currency exchange rate of the Chinese Renminbi (“RMB”). The Company may de-designate the net investment hedges when the Company expects the hedge will cease to be highly effective. The following table presents the after-tax (losses) gains recognized in AOCI on net investment hedges for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 2020 Gains recognized in AOCI $ 101 $ 1,004 Derivatives Not Designated as Hedging Instruments Interest Rate Contracts — The Company enters into interest rate contracts, which include interest rate swaps and options with its customers to allow customers to hedge against the risk of rising interest rates on their variable rate loans. To economically hedge against the interest rate risks in the products offered to its customers, the Company enters into mirrored offsetting interest rate contracts with third-party financial institutions, including central clearing organizations. The following tables present the notional amounts and the gross fair values of interest rate derivative contracts outstanding as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 Customer Counterparty ($ in thousands) Financial Counterparty Notional Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Written options $ 800,962 $ — $ 544 Purchased options $ 800,962 $ 551 $ — Sold collars and corridors 531,840 5,849 158 Collars and corridors 531,840 160 5,888 Swaps 7,597,856 279,361 53,975 Swaps 7,628,500 33,128 168,467 Total $ 8,930,658 $ 285,210 $ 54,677 Total $ 8,961,302 $ 33,839 $ 174,355 ($ in thousands) December 31, 2020 Customer Counterparty ($ in thousands) Financial Counterparty Notional Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Written options $ 957,393 $ — $ 115 Purchased options $ 957,393 $ 101 $ 15 Sold collars and corridors 518,477 7,673 — Collars and corridors 518,477 — 7,717 Swaps 7,586,414 479,634 1,364 Swaps 7,617,524 1,724 306,623 Total $ 9,062,284 $ 487,307 $ 1,479 Total $ 9,093,394 $ 1,825 $ 314,355 In January 2018, the London Clearing House (“LCH”) amended its rulebook to legally characterize variation margin payments made to and received from LCH as settlements of derivatives, and not as collateral against derivatives. Included in the total notional amount of $8.96 billion of interest rate contracts entered into with financial counterparties as of March 31, 2021, was a notional amount of $2.93 billion of interest rate swaps that cleared through LCH. Applying variation margin payments as settlement to LCH cleared derivative transactions resulted in a reduction in derivative asset fair value of $27.2 million and liability fair values of $116.2 million as of March 31, 2021. In comparison, included in the total notional amount of $9.09 billion of interest rate contracts entered into with financial counterparties as of December 31, 2020, was a notional amount of $2.98 billion of interest rate swaps that cleared through LCH. Applying variation margin payments as settlement to LCH cleared derivative transactions resulted in a reduction in derivative asset fair values of $1.3 million and liability fair values of $187.4 million as of December 31, 2020. Foreign Exchange Contracts — The Company enters into foreign exchange contracts with its customers, consisting of forwards, spot, swap and option contracts to accommodate the business needs of its customers. The Company enters into offsetting foreign exchange contracts with third-party financial institutions to manage its foreign exchange exposure with its customers, or enters into bilateral collateral and master netting agreements with certain customer counterparties to manage its credit exposure. The Company also utilizes foreign exchange contracts, which are not designated as hedging instruments, to mitigate the economic effect of currency fluctuations on certain foreign currency-denominated on-balance sheet assets and liabilities, primarily foreign currency-denominated deposits offered to its customers. A majority of the foreign exchange contracts had original maturities of one year or less as of both March 31, 2021 and December 31, 2020. The following tables present the notional amounts and the gross fair values of foreign exchange derivative contracts outstanding as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 Customer Counterparty ($ in thousands) Financial Counterparty Notional Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Forwards and spot $ 2,468,974 $ 27,803 $ 21,835 Forwards and spot $ 168,942 $ 869 $ 494 Swaps 184,584 1,902 247 Swaps 974,974 7,733 4,364 Written options 116,575 — 336 Purchased options 116,575 336 — Collars 3,167 — 11 Collars 3,167 11 — Total $ 2,773,300 $ 29,705 $ 22,429 Total $ 1,263,658 $ 8,949 $ 4,858 ($ in thousands) December 31, 2020 Customer Counterparty ($ in thousands) Financial Counterparty Notional Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Forwards and spot $ 1,522,888 $ 17,575 $ 17,928 Forwards and spot $ 145,197 $ 1,230 $ 273 Swaps 13,590 872 91 Swaps 1,191,355 10,049 3,658 Written options 117,729 — 574 Purchased options 117,729 574 — Total $ 1,654,207 $ 18,447 $ 18,593 Total $ 1,454,281 $ 11,853 $ 3,931 Credit Contracts — The Company may periodically enter into RPA contracts with institutional counterparties to manage the credit exposure on interest rate contracts associated with syndicated loans. The Company may enter into protection sold or protection purchased RPAs. Under the RPAs, the Company will make or receive a payment if a borrower defaults on the related interest rate contract. Credit risk on RPAs is managed by monitoring the credit worthiness of the borrowers and institutional counterparties, which is based on the normal credit review process. The majority of the reference entities of the protection sold RPAs were investment grade as of March 31, 2021, while all were investment grade as of December 31, 2020. Assuming the underlying borrower referenced in the interest rate contracts defaulted as of March 31, 2021 and December 31, 2020, the maximum exposure of protection sold RPAs would be $4.9 million and $6.0 million, respectively. As of March 31, 2021 and December 31, 2020, the weighted-average remaining maturities of the outstanding protection sold RPAs were 3.3 years and 3.5 years, respectively. The notional amount of the RPAs reflects the Company’s pro-rata share of the derivative instrument. The following table presents the notional amounts and the gross fair values of RPAs sold and purchased outstanding as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 December 31, 2020 Notional Fair Value Notional Fair Value Assets Liabilities Assets Liabilities RPAs - protection sold $ 66,278 $ — $ 153 $ 66,278 $ — $ 206 RPAs - protection purchased 10,714 5 — 10,714 13 — Total RPAs $ 76,992 $ 5 $ 153 $ 76,992 $ 13 $ 206 Equity Contracts — Periodically, as part of the Company’s loan origination process, the Company obtains warrants to purchase preferred and/or common stock of technology and life sciences companies to which it provides loans. Warrants grant the Company the right to buy a certain class of the underlying company’s equity at a certain price before expiration. The Company held warrants in 18 private companies as of March 31, 2021, and held warrants in two public companies and 17 private companies as of December 31, 2020. The total fair value of the warrants held in both public and private companies was $272 thousand and $858 thousand as of March 31, 2021 and December 31, 2020, respectively. Commodity Contracts — The Company enters into energy commodity contracts in the form of swaps and options with its commercial loan customers to allow them to hedge against the risk of energy commodity price fluctuation. To economically hedge against the risk of commodity price fluctuation in the products offered to its customers, the Company enters into offsetting commodity contracts with third-party financial institutions to manage the exposure. The following tables present the notional amounts and fair values of the commodity derivative positions outstanding as of March 31, 2021 and December 31, 2020: ($ and units in thousands) March 31, 2021 Customer Counterparty ($ and units in thousands) Financial Counterparty Notional Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Crude oil: Crude oil: Written options 248 Barrels $ 211 $ 25 Purchased options 248 Barrels $ — $ 48 Collars 2,361 Barrels 11,181 219 Collars 2,361 Barrels 219 10,989 Swaps 5,649 Barrels 37,076 1,206 Swaps 5,649 Barrels 1,058 28,624 Total 8,258 $ 48,468 $ 1,450 Total 8,258 $ 1,277 $ 39,661 Natural gas: Natural gas: Written options 8,065 MMBTUs $ 52 $ 319 Purchased options 8,065 MMBTUs $ 319 $ 52 Collars 10,823 MMBTUs 879 — Collars 14,023 MMBTUs — 555 Swaps 84,108 MMBTUs 28,878 18,449 Swaps 91,790 MMBTUs 18,556 25,919 Total 102,996 $ 29,809 $ 18,768 Total 113,878 $ 18,875 $ 26,526 Total $ 78,277 $ 20,218 Total $ 20,152 $ 66,187 ($ and units in thousands) December 31, 2020 Customer Counterparty ($ and units in thousands) Financial Counterparty Notional Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Crude oil: Crude oil: Collars 2,022 Barrels $ 2,344 $ 2,193 Collars 2,022 Barrels $ 2,217 $ 2,402 Swaps 4,299 Barrels 9,282 14,283 Swaps 4,299 Barrels 8,220 7,135 Total 6,321 $ 11,626 $ 16,476 Total 6,321 $ 10,437 $ 9,537 Natural gas: Natural gas: Written options 597 MMBTUs $ — $ 59 Purchased options 597 MMBTUs $ 59 $ — Collars 12,733 MMBTUs 1,063 205 Collars 16,293 MMBTUs 205 813 Swaps 96,305 MMBTUs 32,073 27,238 Swaps 103,973 MMBTUs 26,988 29,837 Total 109,635 $ 33,136 $ 27,502 Total 120,863 $ 27,252 $ 30,650 Total $ 44,762 $ 43,978 Total $ 37,689 $ 40,187 Beginning in January 2017, the Chicago Mercantile Exchange (“CME”) amended its rulebook to legally characterize variation margin payments made to and received from CME as settlements of derivatives and not as collateral against derivatives. As of March 31, 2021, the notional quantities that cleared through CME totaled 1,320 thousand barrels of crude oil and 27,850 thousand MMBTUs of natural gas. Applying the variation margin payments as settlement to CME-cleared derivative transactions resulted in reductions to the gross derivative asset fair value of $897 thousand and to the liability fair value of $10.0 million as of March 31, 2021, to a net fair value of zero. In comparison, the notional quantities that cleared through CME totaled 1,275 thousand barrels of crude oil and 29,733 thousand MMBTUs of natural gas as of December 31, 2020. Applying the variation margin payments as settlement to CME-cleared derivative transactions resulted in a reduction to the gross derivative asset fair value of $7.9 million and to the liability fair value of $3.7 million, respectively, as of December 31, 2020, to a net fair value of zero. The following table presents the net gains (losses) recognized on the Company’s Consolidated Statement of Income related to derivatives not designated as hedging instruments for the three months ended March 31, 2021 and 2020: ($ in thousands) Classification on Three Months Ended March 31, 2021 2020 Derivatives not designated as hedging instruments: Interest rate contracts Interest rate contracts and other derivative income $ 13,901 $ (7,011) Foreign exchange contracts Foreign exchange income 10,243 2,861 Credit contracts Interest rate contracts and other derivative income 45 (23) Equity contracts Lending fees 311 309 Commodity contracts Interest rate contracts and other derivative income 169 24 Net gains (losses) $ 24,669 $ (3,840) Credit Risk-Related Contingent Features — Certain over-the-counter derivative contracts of the Company contain early termination provisions that may require the Company to settle any outstanding balances upon the occurrence of a specified credit risk-related event. These events, which are defined by the existing derivative contracts, primarily relate to a downgrade in the credit rating of East West Bank to below investment grad e. As of March 31, 2021, the aggregate fair value amounts of all derivative instruments with credit risk-related contingent features that were in a net liability position totaled $64.9 million, in which $64.9 million of collateral was posted to cover these positions. As of December 31, 2020, the aggregate fair value amounts of all derivative instruments with credit risk-related contingent features that were in a net liability position totaled $107.4 million, in which $106.8 million of collateral was posted to cover these positions. In the event that the credit rating of East West Bank had been downgraded to below investment grade, minimal additional collateral would have been required to be posted as of March 31, 2021 and December 31, 2020. Offsetting of Derivatives The following tables present the gross derivative fair values, the balance sheet netting adjustments and the resulting net fair values recorded on the consolidated balance sheet, as well as the cash and noncash collateral associated with master netting arrangements. The gross amounts of derivative assets and liabilities are presented after the application of variation margin payments as settlements with central counterparties, where applicable. The collateral amounts in the following tables are limited to the outstanding balances of the related asset or liability, after the application of netting; therefore instances of overcollateralization are not shown: ($ in thousands) As of March 31, 2021 Gross Amounts Recognized (1) Gross Amounts Offset on the Net Amounts Gross Amounts Not Offset on the Net Amount Master Netting Arrangements Cash Collateral Received (3) Security Collateral Received (5) Derivative assets $ 457,317 $ (100,454) $ (7,781) $ 349,082 $ — $ 349,082 Gross Amounts Recognized (2) Gross Amounts Offset on the Net Amounts Gross Amounts Not Offset on the Net Amount Master Netting Arrangements Cash Collateral Pledged (4) Security Collateral Pledged (5) Derivative liabilities $ 344,135 $ (100,454) $ (86,233) $ 157,448 $ (64,816) $ 92,632 ($ in thousands) As of December 31, 2020 Gross Amounts Recognized (1) Gross Amounts Offset on the Net Amounts Gross Amounts Not Offset on the Net Master Netting Arrangements Cash Collateral Received (3) Security Collateral Received (5) Derivative assets $ 602,754 $ (93,063) $ (8,449) $ 501,242 $ (35) $ 501,207 Gross Amounts Recognized (2) Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts Gross Amounts Not Offset on the Net Master Netting Arrangements Cash Collateral Pledged (4) Security Collateral Pledged (5) Derivative liabilities $ 424,828 $ (93,063) $ (91,634) $ 240,131 $ (221,150) $ 18,981 (1) Includes $532 thousand and $1.1 million of gross fair value assets with counterparties that were not subject to enforceable master netting arrangements or similar agreements as of March 31, 2021 and December 31, 2020, respectively. (2) Includes $151 thousand and $220 thousand of gross fair value liabilities with counterparties that were not subject to enforceable master netting arrangements or similar agreements as of March 31, 2021 and December 31, 2020, respectively. (3) Gross cash collateral received under master netting arrangements or similar agreements were $11.9 million and $15.8 million as of March 31, 2021 and December 31, 2020, respectively. Of the gross cash collateral received, $7.8 million and $8.4 million were used to offset against derivative assets, respectively, as of March 31, 2021 and December 31, 2020. (4) Gross cash collateral pledged under master netting arrangements or similar agreements were $90.8 million and $91.6 million as of March 31, 2021 and December 31, 2020, respectively. Of the gross cash collateral pledged, $86.2 million and $91.6 million were used to offset against derivative liabilities, respectively, as of March 31, 2021 and December 31, 2020. (5) Represents the fair value of security collateral received and pledged limited to derivative assets and liabilities that are subject to enforceable master netting arrangements or similar agreements. GAAP does not permit the netting of noncash collateral on the consolidated balance sheet but requires disclosure of such amounts. In addition to the amounts included in the tables above, the Company also has balance sheet netting related to resale and repurchase agreements. Refer to Note 4 — Assets Purchased under Resale Agreements and Sold under Repurchase Agreements to the Consolidated Financial Statements in this Form 10-Q for additional information. Refer to Note 3 — Fair Value Measurement and Fair Value of Financial Instruments to the Consolidated Financial Statements in this Form 10-Q for fair value measurement disclosures on derivatives.

Loans Receivable and Allowance

Loans Receivable and Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2021
Loans and Leases Receivable Disclosure [Abstract]
Loans Receivable and Allowance for Credit Losses	Loans Receivable and Allowance for Credit Losses The following table presents the composition of the Company’s loans held-for-investment as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 December 31, 2020 Commercial: C&I (1) $ 14,081,110 $ 13,631,726 CRE: CRE 11,563,034 11,174,611 Multifamily residential 3,066,515 3,033,998 Construction and land 459,254 599,692 Total CRE 15,088,803 14,808,301 Total commercial 29,169,913 28,440,027 Consumer: Residential mortgage: Single-family residential 8,524,287 8,185,953 HELOCs 1,749,172 1,601,716 Total residential mortgage 10,273,459 9,787,669 Other consumer 145,376 163,259 Total consumer 10,418,835 9,950,928 Total loans held-for-investment (2) $ 39,588,748 $ 38,390,955 Allowance for loan losses (607,506) (619,983) Loans held-for-investment, net (2) $ 38,981,242 $ 37,770,972 (1) Includes Paycheck Protection Program (“PPP”) loans of $2.07 billion and $1.57 billion as of March 31, 2021 and December 31, 2020, respectively. (2) Includes net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts of $(76.9) million and $(58.8) million as of March 31, 2021 and December 31, 2020, respectively. Net origination fees related to PPP loans were $(34.3) million and $(12.7) million as of March 31, 2021 and December 31, 2020, respectively. L oans held-for-investment accrued interest receivable was $106.6 million and $107.5 million as of March 31, 2021 and December 31, 2020, respectively, and is presented in Other assets on the Consolidated Balance Sheets. For the accounting policy on accrued interest receivable related to loans held-for-investment, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies to the Consolidated Financial Statements of the Company’s 2020 Form 10-K. Loans totaling $23.59 billion and $23.26 billion as of March 31, 2021 and December 31, 2020, respectively, were pledged to secure borrowings and provide additional borrowing capacity from the FRBSF and the FHLB. Credit Quality Indicators All loans are subject to the Company’s credit review and monitoring. For the commercial portfolio, loans are risk rated based on an analysis of the borrower’s current payment performance or delinquency, repayment sources, financial and liquidity factors, including industry and geographic considerations. For the majority of the consumer portfolio, payment performance or delinquency is the driving indicator for the risk ratings. For the Company’s internal credit risk ratings, each individual loan is given a risk rating of 1 through 10. Loans risk rated 1 through 5 are assigned an internal risk rating of “Pass,” with loans risk rated 1 being fully secured by cash or U.S. government and its agencies. Pass loans have sufficient sources of repayment to repay the loan in full, in accordance with all terms and conditions. Loans assigned a risk rating of 6 have potential weaknesses that warrant closer attention by management; these are assigned an internal risk rating of “Special Mention.” Loans assigned a risk rating of 7 or 8 have well-defined weaknesses that may jeopardize the full and timely repayment of the loan; these are assigned an internal risk rating of “Substandard.” Loans assigned a risk rating of 9 have insufficient sources of repayment and a high probability of loss; these are assigned an internal risk rating of “Doubtful.” Loans assigned a risk rating of 10 are uncollectable and of such little value that they are no longer considered bankable assets; these are assigned an internal risk rating of “Loss.” 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 and ongoing 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 as of March 31, 2021 and December 31, 2020, presented by loan portfolio segments, internal risk ratings and vintage year. The vintage year is the year of origination, renewal or major modification. ($ in thousands) March 31, 2021 Term Loans Revolving Loans Revolving Loans Converted to Term Loans Amortized Cost Basis Total Amortized Cost Basis by Origination Year 2021 2020 2019 2018 2017 Prior Commercial: C&I: Pass $ 1,661,034 $ 3,043,315 $ 1,220,618 $ 385,813 $ 228,364 $ 280,748 $ 6,492,230 $ 29,327 $ 13,341,449 Criticized (accrual) 55,239 145,506 83,989 29,315 18,541 6,809 274,726 — 614,125 Criticized (nonaccrual) 288 1,540 17,422 21,368 14,858 2,797 67,263 — 125,536 Total C&I 1,716,561 3,190,361 1,322,029 436,496 261,763 290,354 6,834,219 29,327 14,081,110 CRE: CRE: Pass 664,626 2,303,031 2,354,998 2,253,230 1,284,384 2,128,975 193,541 24,104 11,206,889 Criticized (accrual) 28,915 34,902 63,620 25,343 61,238 91,993 — — 306,011 Criticized (nonaccrual) — — — 42,067 5,868 2,199 — — 50,134 Total CRE 693,541 2,337,933 2,418,618 2,320,640 1,351,490 2,223,167 193,541 24,104 11,563,034 Multifamily residential: Pass 160,470 764,482 762,001 470,223 352,094 488,260 5,889 — 3,003,419 Criticized (accrual) — — 731 22,309 6,067 29,296 — — 58,403 Criticized (nonaccrual) — — — 1,447 1,125 2,121 — — 4,693 Total multifamily residential 160,470 764,482 762,732 493,979 359,286 519,677 5,889 — 3,066,515 Construction and land: Pass 5,642 141,475 146,701 121,364 — 20,691 — — 435,873 Criticized (accrual) 3,481 — — — — — — — 3,481 Criticized (nonaccrual) — — — — — 19,900 — — 19,900 Total construction and land 9,123 141,475 146,701 121,364 — 40,591 — — 459,254 Total CRE 863,134 3,243,890 3,328,051 2,935,983 1,710,776 2,783,435 199,430 24,104 15,088,803 Total commercial 2,579,695 6,434,251 4,650,080 3,372,479 1,972,539 3,073,789 7,033,649 53,431 29,169,913 Consumer: Residential mortgage: Single-family residential: Pass (1) 669,660 2,427,430 1,704,855 1,385,623 956,307 1,360,015 — — 8,503,890 Criticized (accrual) — — — 194 347 2,207 — — 2,748 Criticized (nonaccrual) (1) — — 1,205 1,038 2,246 13,160 — — 17,649 Total single-family residential mortgage 669,660 2,427,430 1,706,060 1,386,855 958,900 1,375,382 — — 8,524,287 HELOCs: Pass — 690 548 3,235 4,319 14,931 1,458,199 255,538 1,737,460 Criticized (accrual) — — — — — 1 287 547 835 Criticized (nonaccrual) — — 151 188 4,019 1,838 449 4,232 10,877 Total HELOCs — 690 699 3,423 8,338 16,770 1,458,935 260,317 1,749,172 Total residential mortgage 669,660 2,428,120 1,706,759 1,390,278 967,238 1,392,152 1,458,935 260,317 10,273,459 Other consumer: Pass 849 8,168 — — 1,830 83,547 48,455 — 142,849 Criticized (nonaccrual) — — — — 2,492 — 35 — 2,527 Total other consumer 849 8,168 — — 4,322 83,547 48,490 — 145,376 Total consumer 670,509 2,436,288 1,706,759 1,390,278 971,560 1,475,699 1,507,425 260,317 10,418,835 Total $ 3,250,204 $ 8,870,539 $ 6,356,839 $ 4,762,757 $ 2,944,099 $ 4,549,488 $ 8,541,074 $ 313,748 $ 39,588,748 ($ in thousands) December 31, 2020 Term Loans Revolving Loans Revolving Loans Converted to Term Loans Amortized Cost Basis Total Amortized Cost Basis by Origination Year 2020 2019 2018 2017 2016 Prior Commercial: C&I: Pass $ 3,912,147 $ 1,477,740 $ 483,725 $ 245,594 $ 69,482 $ 245,615 $ 6,431,003 $ 29,487 $ 12,894,793 Criticized (accrual) 120,183 74,601 56,785 19,426 1,487 5,872 324,640 — 602,994 Criticized (nonaccrual) 2,125 25,267 22,240 18,787 4,964 1,592 58,964 — 133,939 Total C&I 4,034,455 1,577,608 562,750 283,807 75,933 253,079 6,814,607 29,487 13,631,726 CRE: CRE: Pass 2,296,649 2,402,136 2,310,748 1,328,251 732,694 1,529,681 173,267 19,064 10,792,490 Criticized (accrual) 47,459 63,654 43,447 98,259 2,094 80,662 — — 335,575 Criticized (nonaccrual) — — 42,067 1,115 — 3,364 — — 46,546 Total CRE 2,344,108 2,465,790 2,396,262 1,427,625 734,788 1,613,707 173,267 19,064 11,174,611 Multifamily residential: Pass 783,671 783,589 479,959 411,945 181,213 348,751 5,895 — 2,995,023 Criticized (accrual) — 735 22,330 6,101 264 5,877 — — 35,307 Criticized (nonaccrual) — — 1,475 — — 2,193 — — 3,668 Total multifamily residential 783,671 784,324 503,764 418,046 181,477 356,821 5,895 — 3,033,998 Construction and land: Pass 224,924 172,707 156,712 — 20,897 1,028 — — 576,268 Criticized (accrual) 3,524 — — — — 19,900 — — 23,424 Criticized (nonaccrual) — — — — — — — — — Total construction and land 228,448 172,707 156,712 — 20,897 20,928 — — 599,692 Total CRE 3,356,227 3,422,821 3,056,738 1,845,671 937,162 1,991,456 179,162 19,064 14,808,301 Total commercial 7,390,682 5,000,429 3,619,488 2,129,478 1,013,095 2,244,535 6,993,769 48,551 28,440,027 Consumer: Residential mortgage: Single-family residential: Pass (1) 2,385,853 1,813,200 1,501,660 1,021,707 523,170 921,714 — — 8,167,304 Criticized (accrual) — 1,429 — — 119 1,034 — — 2,582 Criticized (nonaccrual) (1) — 226 812 1,789 1,994 11,246 — — 16,067 Total single-family residential mortgage 2,385,853 1,814,855 1,502,472 1,023,496 525,283 933,994 — — 8,185,953 HELOCs: Pass 1,131 880 2,879 5,363 8,433 13,475 1,328,919 225,810 1,586,890 Criticized (accrual) — — 200 — 996 — 1,328 606 3,130 Criticized (nonaccrual) — 151 285 4,617 164 1,962 — 4,517 11,696 Total HELOCs 1,131 1,031 3,364 9,980 9,593 15,437 1,330,247 230,933 1,601,716 Total residential mortgage 2,386,984 1,815,886 1,505,836 1,033,476 534,876 949,431 1,330,247 230,933 9,787,669 Other consumer: Pass 9,531 — — 1,830 — 83,255 66,136 — 160,752 Criticized (accrual) 16 — — — — — — — 16 Criticized (nonaccrual) — — — 2,491 — — — — 2,491 Total other consumer 9,547 — — 4,321 — 83,255 66,136 — 163,259 Total consumer 2,396,531 1,815,886 1,505,836 1,037,797 534,876 1,032,686 1,396,383 230,933 9,950,928 Total $ 9,787,213 $ 6,816,315 $ 5,125,324 $ 3,167,275 $ 1,547,971 $ 3,277,221 $ 8,390,152 $ 279,484 $ 38,390,955 (1) As of March 31, 2021 and December 31, 2020, $647 thousand and $747 thousand of nonaccrual loans whose payments are guaranteed by the Federal Housing Administration were classified with a pass rating. Revolving loans that are converted to term loans presented in the table above are excluded from the term loans by vintage year columns. During the three months ended March 31, 2021 and 2020, HELOCs totaling $44.3 million and $31.3 million, respectively, were converted to term loans. During the three months ended March 31, 2021 and 2020, there were no conversions of C&I revolving loans to term loans. Two CRE revolving loans of $5.0 million were converted to term loans during the three months ended March 31, 2021. There were no conversions of CRE revolving loans to term loans during the three months ended March 31, 2020. Nonaccrual and Past Due Loans Loans that are 90 or more days past due are generally placed on nonaccrual status, unless the loan is well-collateralized and in the process of collection. Loans that are less than 90 days past due but have identified deficiencies, such as when the full collection of principal or interest becomes uncertain, are also placed on nonaccrual status. Payment deferral activities instituted in response to the COVID-19 pandemic could continue to delay the recognition of delinquencies for customers who otherwise would have moved into nonaccrual status. The following table presents the aging analysis of total loans held-for-investment as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 Current Accruing Loans (1) Accruing Accruing Total Total Total Commercial: C&I $ 13,923,524 $ 26,417 $ 5,633 $ 32,050 $ 125,536 $ 14,081,110 CRE: CRE 11,473,405 5,688 33,807 39,495 50,134 11,563,034 Multifamily residential 3,061,822 — — — 4,693 3,066,515 Construction and land 439,354 — — — 19,900 459,254 Total CRE 14,974,581 5,688 33,807 39,495 74,727 15,088,803 Total commercial 28,898,105 32,105 39,440 71,545 200,263 29,169,913 Consumer: Residential mortgage: Single-family residential 8,493,416 9,827 2,748 12,575 18,296 8,524,287 HELOCs 1,735,692 1,769 834 2,603 10,877 1,749,172 Total residential mortgage 10,229,108 11,596 3,582 15,178 29,173 10,273,459 Other consumer 142,604 242 4 246 2,526 145,376 Total consumer 10,371,712 11,838 3,586 15,424 31,699 10,418,835 Total $ 39,269,817 $ 43,943 $ 43,026 $ 86,969 $ 231,962 $ 39,588,748 ($ in thousands) December 31, 2020 Current Accruing Loans (1) Accruing Accruing Total Total Total Commercial: C&I $ 13,488,070 $ 8,993 $ 724 $ 9,717 $ 133,939 $ 13,631,726 CRE: CRE 11,127,690 375 — 375 46,546 11,174,611 Multifamily residential 3,028,512 1,818 — 1,818 3,668 3,033,998 Construction and land 579,792 19,900 — 19,900 — 599,692 Total CRE 14,735,994 22,093 — 22,093 50,214 14,808,301 Total commercial 28,224,064 31,086 724 31,810 184,153 28,440,027 Consumer: Residential mortgage: Single-family residential 8,156,645 9,911 2,583 12,494 16,814 8,185,953 HELOCs 1,583,968 2,922 3,130 6,052 11,696 1,601,716 Total residential mortgage 9,740,613 12,833 5,713 18,546 28,510 9,787,669 Other consumer 160,534 217 17 234 2,491 163,259 Total consumer 9,901,147 13,050 5,730 18,780 31,001 9,950,928 Total $ 38,125,211 $ 44,136 $ 6,454 $ 50,590 $ 215,154 $ 38,390,955 (1) As of March 31, 2021 and December 31, 2020, the “Current Accruing Loans” balance of loans in payment deferral programs offered in response to the COVID-19 pandemic which are performing according to their modified terms are generally not considered delinquent. The following table presents the amortized cost of loans on nonaccrual status for which there was no related allowance for loan losses as of March 31, 2021 and December 31, 2020. Nonaccrual loans may not have an allowance for credit losses if the loss expectation is zero as the loan balances are supported by the collateral value. ($ in thousands) March 31, 2021 December 31, 2020 Commercial: C&I $ 63,312 $ 62,040 CRE: CRE 49,137 45,537 Multifamily residential 3,578 2,519 Construction and land 19,900 — Total CRE 72,615 48,056 Total commercial 135,927 110,096 Consumer: Residential mortgage: Single-family residential 6,014 6,013 HELOCs 7,353 8,076 Total residential mortgage 13,367 14,089 Other consumer 2,491 2,491 Total consumer 15,858 16,580 Total nonaccrual loans with no related allowance for loan losses $ 151,785 $ 126,676 Foreclosed Assets Foreclosed assets, consisting of OREO and other nonperforming assets, are included in Other assets on the Consolidated Balance Sheet. The Company had $26.2 million in foreclosed assets as of March 31, 2021 compared with $19.7 million as of December 31, 2020. The Company commences the foreclosure process on consumer mortgage loans when a borrower becomes more than 120 days delinquent in accordance with Consumer Finance Protection Bureau guidelines. The carrying value of consumer real estate loans that were in the process of active or suspended foreclosure was $5.8 million and $4.1 million as of March 31, 2021 and December 31, 2020, respectively. The Company has suspended certain mortgage foreclosure activities in connection with our actions to support our customers during the COVID-19 pandemic. Troubled Debt Restructurings Troubled debt restructurings (“TDRs”) are individually evaluated, and the type of restructuring is selected based on the loan type and the circumstances of the borrower’s financial difficulty. A TDR is a modification of the terms of a loan when the Company, for economic or legal reasons related to the borrower’s financial difficulties, grants a concession to the borrower that it would not have otherwise considered. Since March 2020, the Company has implemented various commercial and consumer loan modification programs to provide its borrowers relief from the economic impacts of the COVID-19 pandemic. These COVID-related modifications are generally not classified as TDRs due to the relief under the Coronavirus Aid, Relief, and Economic Security Act, as amended by the Consolidated Appropriations Act, 2021, and the Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customers Affected by the Coronavirus (Revised), and therefore are not included in the discussion below. Assistance provided in response to the COVID-19 pandemic could delay the recognition of delinquencies, nonaccrual status, and net charge-offs for those borrowers who would have otherwise moved into past due or nonaccrual status. See Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies to the Consolidated Financial Statements of the Company’s 2020 Form 10-K. The following table presents the additions to TDRs for the three months ended March 31, 2021 and 2020: ($ in thousands) Loans Modified as TDRs During the Three Months Ended March 31, 2021 2020 Number Pre- Post- Modification Outstanding Recorded Investment (1) Financial Impact (2) Number Pre- Post- Modification Outstanding Recorded Investment (1) Financial Impact (2) Commercial: C&I 1 $ 443 $ 433 $ 203 3 $ 16,604 $ 15,735 $ 98 Total 1 $ 443 $ 433 $ 203 3 $ 16,604 $ 15,735 $ 98 (1) Includes subsequent payments after modification and reflects the balance as of March 31, 2021 and 2020. (2) Includes charge-offs and specific reserves recorded since the modification date. The following table presents the TDR post-modification outstanding balances for the three months ended March 31, 2021 and 2020 by modification type: ($ in thousands) Modification Type During the Three Months Ended March 31, 2021 2020 Principal (1) Principal and Interest (2) Total Principal (1) Principal and Interest (2) Total Commercial: C&I $ 433 $ — $ 433 $ 4,564 $ 11,171 $ 15,735 Total $ 433 $ — $ 433 $ 4,564 $ 11,171 $ 15,735 (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 principal and interest deferments or reductions. After a loan is modified as 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 for which a subsequent payment default occurred during the three months ended March 31, 2021, which had been modified as TDR within the previous 12 months of its default, and were still in default as of March 31, 2021. In comparison, there were no TDRs that experienced payment default after modifications within the previous 12 months during the three months ended March 31, 2020. ($ in thousands) Loans Modified as TDRs that Subsequently Defaulted 2021 Number of Recorded Commercial: C&I 1 $ 11,538 Total 1 $ 11,538 The amount of additional funds committed to lend to borrowers whose terms have been modified as TDRs was $2.2 million and $3.0 million as of March 31, 2021 and December 31, 2020, respectively. Allowance for Credit Losses The Company has an allowance framework under ASU 2016-13 for all financial assets measured at amortized cost and certain off-balance sheet credit exposures. The measurement of the allowance for credit losses is based on management’s best estimate of lifetime expected credit losses inherent in the Company’s relevant financial assets. 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, and deferred fees and costs. Subsequent changes in expected credit losses are recognized in net income as a provision for credit loss expense or a reversal of credit loss expense. The process of the allowance for credit losses involves procedures to consider the unique risk characteristics of the portfolio segments. The majority of the Company’s credit exposures share risk characteristics with other similar exposures, and as a result are collectively evaluated. The collectively evaluated loans cover performing risk-rated 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. The individually assessed loans cover loans modified in a TDR, collateral-dependent loans, as well as, risk-rated loans that have been placed on nonaccrual status. Allowance for Collectively Evaluated Loans The allowance for collectively evaluated loans consists of a quantitative component that assesses many different risk factors that we consider 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 allowance for loan losses is estimated using quantitative methods that consider a variety of factors such as historical loss experience, the current credit quality of the portfolio, as well as an economic outlook over the life of the loan. The Company incorporates forward-looking information using macroeconomic scenarios applied over the forecasted life of the loans. The forward-looking information is limited to the reasonable and supportable period. These macroeconomic scenarios include variables that are considered key drivers of increases and decreases in credit losses. The Company utilizes a probability-weighted multiple scenario forecast approach. These scenarios may consist of a base forecast representing management's view of the most likely outcome, combined with downside and upside scenarios reflecting possible worsening or improving economic conditions. A probability-weighted average of these macroeconomic scenarios over a reasonable and supportable forecast period is incorporated into the quantitative models. If the loans’ life extends beyond the reasonable and supportable forecast period, then historical experience, or long-run macroeconomic trends is considered over the remaining life of the loans in estimation of the allowance for loan losses. 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 adversely classified or rated financial assets; • The Company’s lending policies and procedures, including changes in lending strategies, underwriting standards, collection, write-off and recovery practices, • Knowledge of the borrower’s operations; • The quality of the Company’s credit review system; • The experience, ability and depth of the Company’s management, lending staff and other relevant staff; • The effect of other external factors such as the regulatory, legal and technological environments; and • Actual and expected changes in international, national, regional, and local economic and business conditions in which the Company operates, including the actual and expected conditions of various market segments. 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 changes in these factors diverge from period to period. For the three months ended March 31, 2021 and 2020, there were no changes to the reasonable and supportable forecast period and reversion to historical loss experience method. 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 Internal risk rating; size and credit spread at origination, and time to maturity Unemployment rate, and two and ten year treasury spread CRE, Multifamily residential, and Construction and land Delinquency status; maturity date; collateral value; property type, and geographic location Unemployment rate; GDP, and U.S. Treasury rates Single-family residential and HELOCs FICO; delinquency status; maturity date; collateral value, and geographic location Unemployment rate; GDP, and home price index Other consumer Historical loss experience Immaterial (1) (1) Macroeconomic variables are included in the qualitative estimate. Allowance for Loan Losses for the Commercial Loan Portfolio — The Company’s C&I loan lifetime loss rate model estimates credit losses by estimating a loss rate expected over the life of a loan. This loss rate is applied to the amortized cost basis, excluding accrued interest 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. For CRE loans, projected probability of defaults (“PDs”) and loss given defaults (“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. Within the reasonable and supportable period, the forecast of future economic conditions returns to long-run historical economic trends. In order to estimate the life of a loan under both models, the contractual term of the loan is adjusted for estimated prepayments, which are based on historical prepayment experience. Allowance for Loan Losses for the Consumer Loan Portfolio — For single-family residential and HELOC loans, 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. Within the reasonable and supportable period, the forecast of future economic conditions returns to long-run historical economic trends. For other consumer loans, the Company uses a loss rate approach. In order to estimate the life of a loan, the contractual term of the loan is adjusted for estimated prepayments, which are based on historical prepayment experience. Qualitative Allowance for Collectively Evaluated Loans — 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. The allowance for loan losses as of March 31, 2021 and December 31, 2020 also included qualitative adjustments for certain industry sectors, such as oil & gas, included as part of the C&I loan portfolio. Allowance for Individually Evaluated Loans When a loan no longer shares similar risk characteristics with other loans, such as in the case for certain nonaccrual or TDR loans, the Company estimates the allowance for loan losses on an individual loan basis. The allowance for loan losses for individually evaluated loans is measured as the difference between the recorded value of the loans and their fair value. For loans evaluated individually, the Company uses one of three different asset valuation measurement methods: (1) the fair value of collateral less costs to sell; (2) the present value of expected future cash flows; and (3) the loan's observable market price. If an individually evaluated loan is determined to be collateral dependent, the Company applies the fair value of the collateral less costs to sell method. If an individually evaluated loan is determined 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 — When a loan is collateral dependent, the allowance is measured on an individual loan basis and is limited to the difference between the recorded value and fair value of the collateral less cost of disposal or sale. As of March 31, 2021, collateral-dependent commercial and consumer loans totaled $99.9 million and $16.6 million, respectively. In comparison, collateral-dependent commercial and consumer loans totaled $97.2 million and $17.3 million as of December 31, 2020, respectively. The Company's commercial collateral-dependent loans were secured by real estate or other collateral. The Company's consumer collateral-dependent loans were all residential mortgage loans, secured by the underlying real estate. As of both March 31, 2021 and December 31, 2020 , the collateral value of the properties securing each of these collateral-dependent loans, net of selling costs, exceeded the recorded value of the individual loans. The following tables summarize the activity in the allowance for loan losses by portfolio segments for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 Commercial Consumer Total C&I CRE Residential Mortgage Other CRE Multifamily Construction Single- HELOCs Allowance for loan losses, beginning of period $ 398,040 $ 163,791 $ 27,573 $ 10,239 $ 15,520 $ 2,690 $ 2,130 $ 619,983 Provision for (reversal of) credit losses on loans (a) 3,839 (10,277) (1,391) 8,592 376 22 (113) 1,048 Gross charge-offs (8,436) (7,195) (17) (71) (134) (45) (1) (15,899) Gross recoveries 760 80 1,242 329 77 3 2 2,493 Total net (charge-offs) recoveries (7,676) (7,115) 1,225 258 (57) (42) 1 (13,406) Foreign currency translation adjustment (119) — — — — — — (119) Allowance for loan losses, end of period $ 394,084 $ 146,399 $ 27,407 $ 19,089 $ 15,839 $ 2,670 $ 2,018 $ 607,506 ($ in thousands) Three Months Ended March 31, 2020 Commercial Consumer Total C&I CRE Residential Mortgage Other CRE Multifamily Construction Single- HELOCs Allowance for loan losses, beginning of period $ 238,376 $ 40,509 $ 22,826 $ 19,404 $ 28,527 $ 5,265 $ 3,380 $ 358,287 Impact of ASU 2016-13 adoption 74,237 72,169 (8,112) (9,889) (3,670) (1,798) 2,221 125,158 Provision for (reversal of) credit losses on loans (a) 60,618 11,435 1,281 1,482 1,700 412 (2,272) 74,656 Gross charge-offs (11,977) (954) — — — — (26) (12,957) Gross recoveries 1,575 9,660 535 21 265 2 1 12,059 Total net (charge-offs) recoveries (10,402) 8,706 535 21 265 2 (25) (898) Foreign currency translation adjustment (200) — — — — — — (200) Allowance for loan losses, end of period $ 362,629 $ 132,819 $ 16,530 $ 11,018 $ 26,822 $ 3,881 $ 3,304 $ 557,003 The following table summarizes the activities in the allowance for unfunded credit commitments for the three months ended March 31, 2021 and 2020 : ($ in thousands) Three Months Ended March 31, 2021 2020 Unfunded credit facilities Allowance for unfunded credit commitments, beginning of period $ 33,577 $ 11,158 Impact of ASU 2016-13 adoption — 10,457 Reversal of credit losses on unfunded credit commitments (b) (1,048) (786) Allowance for unfunded credit commitments, end of period 32,529 20,829 Provision for credit losses (a) + (b) $ — $ 73,870 The allowance for credit losses as of March 31, 2021 was $640.0 million, a decrease of $13.6 million compared with $653.6 million as of December 31, 2020. The decrease in the allowance for credit losses was comprised of a net decrease of $12.5 million in the allowance for loan losses and a $1.1 million decrease in the allowance for unfunded credit commitments. The improved macroeconomic outlook resulted in an overall decrease in the required allowance for credit losses as of March 31, 2021, and no provision for credit losses was recorded for the three months ended March 31, 2021. The Company uses a multi-scenario approach in calculating the allowance for loan losses and applies management judgment to add qualitative factors for the impact of the COVID-19 pandemic on industry and CRE sectors that are affected by the pandemic. The allowance for unfunded credit commitments is maintained at a level that management believes to be sufficient to absorb estimated expected credit losses related to unfunded credit facilities. See Note 10 — Commitments and Contingencies to the Consolidated Financial Statements in this Form 10-Q for additional information related to unfunded credit commitments. Loans Held-for-Sale As of March 31, 2021, the Company had no loans held-for-sale. As of December 31, 2020, loans held-for-sale of $1.8 million consisted of single-family residential loans. Refer to Note 1 — Summary of Significant Acc

Investments in Qualified Afford

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities	3 Months Ended
	Mar. 31, 2021
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities [Abstract]
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities	Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities The 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 minimum 15-year compliance period. In addition to affordable housing projects, the Company also invests in New Market Tax Credit projects that qualify for CRA 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 the investments in historic tax credits promote the rehabilitation of historic buildings and economic revitalization of the surrounding areas. Investments in Qualified Affordable Housing Partnerships, Net The Company records its investments in qualified affordable housing partnerships, net, using the proportional amortization method. Under the proportional amortization method, the Company amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received, and recognizes the amortization in Income tax expense on the Consolidated Statement of Income. The following table presents the Company’s investments in qualified affordable housing partnerships, net, and related unfunded commitments as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 December 31, 2020 Investments in qualified affordable housing partnerships, net $ 284,862 $ 213,555 Accrued expenses and other liabilities — Unfunded commitments $ 142,103 $ 77,444 The following table presents additional information related to the Company’s investments in qualified affordable housing partnerships, net, for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 2020 Tax credits and other tax benefits recognized $ 11,028 $ 11,031 Amortization expense included in income tax expense $ 8,712 $ 8,384 Investments in Tax Credit and Other Investments, Net Depending on the ownership percentage and the influence the Company has on the investments in tax credit and other investments, net, the Company applies the equity or cost method of accounting, or the measurement alternative as elected under ASU 2016-01 for equity investments without readily determinable fair value. The following table presents the Company’s investments in tax credit and other investments, net, and related unfunded commitments as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 December 31, 2020 Investments in tax credit and other investments, net $ 361,438 $ 266,525 Accrued expenses and other liabilities — Unfunded commitments $ 192,644 $ 105,282 Amortization of tax credit and other investments was $25.4 million and $18.8 million for the three months ended March 31, 2021 and 2020, respectively. The Company held equity securities that are mutual funds with readily determinable fair values of $26.7 million and $31.3 million, as of March 31, 2021 and December 31, 2020, respectively. The Company invested in these mutual funds for CRA purposes. These equity securities were measured at fair value with changes in fair value recorded in net income. For these investments, the Company recorded a $497 thousand unrealized loss compared to a $38 thousand unrealized gain during the three months ended March 31, 2021 and 2020, respectively. Equity securities with readily determinable fair value were included in Investments in tax credit and other investments, net on the Consolidated Balance Sheet. The Company held equity securities without readily determinable fair values totaling $27.2 million and $23.7 million as of March 31, 2021 and December 31, 2020, respectively, which were measured using the measurement alternative at cost less impairment and adjusted for observable price changes. For the three months ended March 31, 2021 and 2020, there were no adjustments made to these securities. Equity securities without readily determinable fair values were included in Investments in tax credit and other investments, net and Other assets on the Consolidated Balance Sheet. Tax credit investments are evaluated for possible OTTI on an annual basis or when events or changes in circumstances suggest that the carrying amount of the tax credit investments may not be realizable. OTTI charges are recorded within Amortization of tax credit and other investments, net on the Consolidated Statement of Income. Refer to Note 3 — Fair Value Measurement and Fair Value of Financial Instruments to the Consolidated Financial Statements in this Form 10-Q for a discussion on the Company’s impairment evaluation and monitoring process of tax credit investments. For the three months ended March 31, 2021, the Company recorded an impairment recovery of $374 thousand related to one historic tax credit and recorded no OTTI charge within Amortization of tax credit and other investments on the Consolidated Statement of Income. In comparison, the Company recorded an impairment recovery of $150 thousand related to one historic tax credit and recorded no OTTI charge for the three months ended March 31, 2020. Variable Interest Entities The Company invests in unconsolidated limited partnerships and similar entities that construct, own and operate affordable housing, historic rehabilitation, wind and solar projects, of which the majority of such investments are variable interest entities (“VIEs”). As a limited partner in these partnerships, these investments are designed to generate a return primarily through the realization of federal tax credits and tax benefits. An unrelated third party is typically the general partner or managing member who has control over the significant activities of such investments. While the Company’s interest in some of the investments may exceed 50% of the outstanding equity interests, the Company does not consolidate these structures due to the general partner or managing member’s ability to manage the entity, which is indicative of power over them. The Company’s maximum exposure to loss in connection with these partnerships consist of the unamortized investment balance and any tax credits claimed that may become subject to recapture. Special purpose entities formed in connection with securitization transactions are generally considered VIEs. A CLO is a VIE that purchases a pool of assets consisting primarily of non-investment grade corporate loans, and issues multiple tranches of notes to investors to fund the asset purchases and pay upfront expenses associated with forming the CLO. The Company served as the collateral manager of a CLO that closed in 2019 and subsequently reassigned its portfolio manager responsibilities in 2020. The Company retained the top 3 investment grade-rated tranches issued by the CLO, for which the total carrying amount was $291.5 million and $287.5 million as of March 31, 2021 and December 31, 2020, respectively.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill Total goodwill was $465.7 million as of both March 31, 2021 and December 31, 2020. The Company’s annual goodwill impairment testing is performed as of December 31 of each year, or more frequently as events occur or circumstances change that would more-likely-than-not reduce the fair value of a reporting unit below its carrying value. Additional information pertaining to our accounting policy for goodwill is summarized in Note 1 — Summary of Significant Accounting Policies — Goodwill and Other Intangible Assets to the Consolidated Financial Statements of the Company’s 2020 Form 10-K. The Company completed an annual goodwill impairment testing as of December 31, 2020, and determined there was no goodwill impairment. As of March 31, 2021, while COVID-19 cases have begun to ease from the January 2021 peak, the spread of new, more contagious variants could impact the magnitude and duration of this health crisis. However, ongoing virus containment efforts and vaccination progress, as well as the possibility of further government stimulus, could accelerate the macroeconomic recovery. The Company conducted a qualitative interim impairment test as of March 31, 2021, and concluded goodwill was not impaired. There were no changes in the carrying amount of goodwill during the three months ended March 31, 2021 and 2020. Core Deposit Intangibles The following table presents the gross carrying amount of core deposit intangible assets and accumulated amortization as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 December 31, 2020 Gross balance (1) $ 86,099 $ 86,099 Accumulated amortization (1) (80,454) (79,722) Net carrying balance (1) $ 5,645 $ 6,377 (1) Excludes fully amortized core deposit intangible assets. There were no impairment write-downs of the core deposit intangibles for the three months ended March 31, 2021 and 2020. Amortization Expense The Company amortizes the core deposit intangibles based on the projected useful lives of the related deposits. The amortization expense related to the core deposit intangible assets was $732 thousand and $953 thousand for the three months ended March 31, 2021 and 2020, respectively. The following table presents the estimated future amortization expense of core deposit intangibles as of March 31, 2021: ($ in thousands) Amount Remainder of 2021 $ 2,017 2022 1,865 2023 1,199 2024 553 2025 11 Total $ 5,645

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments to Extend Credit — In the normal course of business, the Company provides customers loan commitments on predetermined terms. These outstanding commitments to extend credit are not reflected in the accompanying Consolidated Financial Statements. While the Company does not anticipate losses as a result of these transactions, commitments to extend credit are included in determining the appropriate level of the allowance for unfunded credit commitments, and outstanding commercial and standby letters of credits (“SBLCs”). The following table presents the Company’s credit-related commitments as of March 31, 2021 and December 31, 2020: ($ in thousands) March 30, 2021 December 31, 2020 Expire in One Year or Less Expire After One Year Through Three Years Expire After Three Years Through Expire After Five Years Total Total Loan commitments $ 3,090,244 $ 1,943,216 $ 638,815 $ 172,171 $ 5,844,446 $ 5,690,917 Commercial letters of credit and SBLCs 1,263,991 398,670 166,496 513,202 2,342,359 2,240,813 Total $ 4,354,235 $ 2,341,886 $ 805,311 $ 685,373 $ 8,186,805 $ 7,931,730 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 maintenance of compensatory balances. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future funding requirements. Commercial letters of credit are issued to facilitate domestic and foreign trade transactions, while SBLCs are generally contingent upon the failure of the customers to perform according to the terms of the underlying contract with the third party. As a result, the total contractual amounts do not necessarily represent future funding requirements. The Company’s historical experience is that SBLCs typically expire without being funded. Additionally, in many cases, the Company holds collateral in various forms against these SBLCs. As part of its risk management activities, the Company monitors the creditworthiness of customers in conjunction with its SBLC exposure. Customers are obligated to reimburse the Company for any payment made on the customers’ behalf. If the customers fail to pay, the Company would, as applicable, liquidate the collateral and/or offset accounts. As of March 31, 2021, total letters of credit of $2.34 billion consisted of SBLCs of $2.22 billion and commercial letters of credit of $125.0 million. As of December 31, 2020, total letters of credit of $2.24 billion consisted of SBLCs of $2.12 billion and commercial letters of credit of $124.9 million. The Company applies the same credit underwriting criteria to extend loans, commitments and conditional obligations to customers. Each customer’s creditworthiness is evaluated on a case-by-case basis. Collateral and financial guarantees may be obtained based on management’s assessment of a customer’s credit. Collateral may include cash, accounts receivable, inventory, property, plant and equipment, and income-producing commercial property. Estimated exposure to loss from these commitments is included in the allowance for unfunded credit commitments and amounted to $32.4 million and $33.5 million as of March 31, 2021 and December 31, 2020, respectively. Guarantees — From time to time, the Company sells or securitizes single-family and multifamily residential loans with recourse in the ordinary course of business. The Company is obligated to repurchase up to the recourse percentage of the loans if the loans default. The following table presents the carrying amounts of loans sold or securitized with recourse and the maximum potential future payments as of March 31, 2021 and December 31, 2020: ($ in thousands) Maximum Potential Future Payments Carrying Value March 31, 2021 December 31, 2020 March 31, 2021 December 31, 2020 Expire After One Year Through Three Years Expire After Three Years Through Expire After Five Years Total Total Total Total Single-family residential loans sold or securitized with recourse $ 392 $ 369 $ 9,525 $ 10,286 $ 10,526 $ 10,286 $ 10,526 Multi-family residential loans sold or securitized with recourse 195 — 14,995 15,190 15,672 25,117 26,619 Total $ 587 $ 369 $ 24,520 $ 25,476 $ 26,198 $ 35,403 $ 37,145 The Company’s recourse reserve related to these guarantees is included in the allowance for unfunded credit commitments and totaled $83 thousand and $88 thousand as of March 31, 2021 and December 31, 2020, 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. Other Commitments — The Company has commitments to invest in qualified affordable housing partnerships, tax credit and other investments as discussed in Note 8 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities to the Consolidated Financial Statements in this Form 10-Q. As of March 31, 2021 and December 31, 2020, these commitments were $334.7 million and $182.7 million, respectively. These commitments are included in Accrued expenses and other liabilities on the Consolidated Balance Sheet.

Stock Compensation Plans

Stock Compensation Plans	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Stock Compensation Plans	Stock Compensation Plans Pursuant to the Company’s 2016 Stock Incentive Plan, as amended, the Company may issue stocks, stock options, restricted stock, restricted stock units (“RSUs”), stock purchase warrants, stock appreciation rights, phantom stock and dividend equivalents to eligible employees, non-employee directors, consultants, and other service providers of the Company and its subsidiaries. The Company has granted RSUs as its primary incentive awards. Stock options have not been issued during the last three years and no stock options were outstanding as of both March 31, 2021 and December 31, 2020. The following table presents a summary of the total share-based compensation expense and the related net tax benefits (deficiencies) associated with the Company’s various employee share-based compensation plans for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 2020 Stock compensation costs $ 7,817 $ 7,209 Related net tax benefits (deficiencies) for stock compensation plans $ 1,620 $ (1,566) 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 predominantly in shares of the Company’s common stock. Certain RSUs are settled in cash. Dividend 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 the attainment of specified performance goals referred to as “performance-based RSUs.” Performance-based RSUs are granted annually upon approval by the Company’s Compensation 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 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. Compensation costs are calculated using the quoted market price of the Company’s common stock at the grant date. Compensation costs for certain time-based awards that will be settled in cash are adjusted to fair value based on changes in the share price of the Company’s common stock up to the settlement date. For performance-based RSUs, the compensation costs are based on grant date fair value which considers both performance and market conditions, and is subject to subsequent adjustments based on the Company’s outcome of meeting the performance criteria at the end of performance period. Compensation costs of both time-based and performance-based awards are estimated based on awards ultimately expected to vest, and are recognized net of estimated forfeitures on a straight-line basis from the grant date until the vesting date of each grant. For accounting on stock-based compensation plans, see Note 1 — Summary of Significant Accounting Policies — Stock-Based Compensation to the Consolidated Financial Statements of the Company’s 2020 Form 10-K for additional information. The following table presents a summary of the activities for the Company’s time-based and performance-based RSUs that will be settled in shares for the three months ended March 31, 2021. 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 Shares Weighted-Average Outstanding, January 1, 2021 1,345,635 $ 50.22 398,057 $ 53.66 Granted 374,875 71.40 91,960 77.67 Vested (275,503) 67.30 (120,286) 70.13 Forfeited (26,369) 60.94 — — Outstanding, March 31, 2021 1,418,638 $ 52.30 369,731 $ 54.28 The following table presents a summary of the activities for the Company’s time-based RSUs that will be vested in cash for the three months ended March 31, 2021: Shares Outstanding, January 1, 2021 21,802 Granted 15,803 Vested — Forfeited (4,075) Outstanding, March 31, 2021 33,530 As of March 31, 2021, there were $37.0 million and $22.1 million of total unrecognized compensation costs related to unvested time-based and performance-based RSUs, respectively. These costs are expected to be recognized over a weighted-average period of 2.21 years and 2.29 years, respectively.

Stockholders' Equity and Earnin

Stockholders' Equity and Earnings Per Share	3 Months Ended
	Mar. 31, 2021
Stockholders' Equity and Earnings Per Share [Abstract]
Stockholders' Equity and Earnings Per Share	Stockholders’ Equity and Earnings Per Share The following table presents the basic and diluted EPS calculations for the three months ended March 31, 2021 and 2020. For more information on the calculation of EPS, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Earnings Per Share to the Consolidated Financial Statements of the Company’s 2020 Form 10-K. ($ and shares in thousands, except per share data) Three Months Ended March 31, 2021 2020 Basic: Net income $ 204,994 $ 144,824 Basic weighted-average number of shares outstanding 141,646 144,814 Basic EPS $ 1.45 $ 1.00 Diluted: Net income $ 204,994 $ 144,824 Basic weighted-average number of shares outstanding 141,646 144,814 Diluted potential common shares (1) 1,198 471 Diluted weighted-average number of shares outstanding (1) 142,844 145,285 Diluted EPS $ 1.44 $ 1.00 (1) Includes dilutive shares from RSUs for the three months ended March 31, 2021 and 2020. For the three months ended March 31, 2021 and 2020, 140 thousand and 328 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 $500.0 million of the Company’s common stock, and the Company repurchased 4,471,682 shares at an average price of $32.64 per share and a total cost of $146.0 million. The Company did not repurchase any shares during the three months ended March 31, 2021.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2021
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 three months ended March 31, 2021 and 2020: ($ in thousands) AFS Cash Foreign Currency Translation Adjustments (1) Total Balance, January 1, 2020 $ (2,419) $ — $ (15,989) $ (18,408) Net unrealized gains (losses) arising during the period 28,530 — (2,164) 26,366 Amounts reclassified from AOCI (1,077) — — (1,077) Changes, net of tax 27,453 — (2,164) 25,289 Balance, March 31, 2020 $ 25,034 $ — $ (18,153) $ 6,881 Balance, January 1, 2021 $ 52,247 $ (1,230) $ (6,692) $ 44,325 Net unrealized (losses) gains arising during the period (133,313) 305 (1,349) (134,357) Amounts reclassified from AOCI (135) 127 — (8) Changes, net of tax (133,448) 432 (1,349) (134,365) Balance, March 31, 2021 $ (81,201) $ (798) $ (8,041) $ (90,040) (1) Represents foreign currency translation adjustments related to the Company’s net investment in non-U.S. operations, including related hedges. The functional currency and reporting currency of the Company’s foreign subsidiary was RMB and USD, respectively. The following table presents the components of other comprehensive income (loss), reclassifications to net income and the related tax effects for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 2020 Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax AFS debt securities: Net unrealized (losses) gains arising during the period $ (189,276) $ 55,963 $ (133,313) $ 40,493 $ (11,963) $ 28,530 Net realized (gains) reclassified into net income (1) (192) 57 (135) (1,529) 452 (1,077) Net change (189,468) 56,020 (133,448) 38,964 (11,511) 27,453 Cash flow hedges: Net unrealized gains arising during the period 426 (121) 305 — — — Net realized losses reclassified into net income (2) 177 (50) 127 — — — Net change 603 (171) 432 — — — Foreign currency translation adjustments, net of hedges: Net unrealized losses arising during the period (1,309) (40) (1,349) (1,766) (398) (2,164) Net change (1,309) (40) (1,349) (1,766) (398) (2,164) Other comprehensive (loss) income $ (190,174) $ 55,809 $ (134,365) $ 37,198 $ (11,909) $ 25,289 (1) For the three months ended March 31, 2021 and 2020, pre-tax amounts were reported in Gains on sales of AFS debt securities on the Consolidated Statement of Income. (2) For the three months ended March 31, 2021 and 2020, pre-tax amounts were reported in Interest expense on the Consolidated Statement of Income.

Business Segments

Business Segments	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Business Segments	Business Segments The Company organizes its operations into three reportable operating segments: (1) Consumer and Business Banking; (2) Commercial Banking; and (3) Other. These segments are defined by the type of customers served, and the related products and services provided. The segments reflect how financial information is currently evaluated by management. Operating segment results are based on the Company’s internal management reporting process, which reflects assignments and allocations of certain balance sheet and income statement items. The information presented is not indicative of how the segments would perform if they operated as independent entities due to the interrelationships among the segments. The Consumer and Business Banking segment primarily provides financial products and services to consumer and commercial customers through the Company’s domestic branch network. This segment offers consumer and commercial deposits, mortgage and home equity loans, and other products and services. It also originates commercial loans for small and medium-sized enterprises through the Company’s branch network. Other products and services provided by this segment include wealth management, treasury management and foreign exchange services. The Commercial Banking segment primarily generates commercial loans and deposits. Commercial loan products include commercial business loans and lines of credit, trade finance loans and letters of credit, CRE loans, construction and land loans, affordable housing loans and letters of credit, asset-based lending and equipment financing. Commercial deposit products and other financial services include treasury management, foreign exchange services and interest rate and commodity risk hedging. The remaining centralized functions, including the corporate treasury activities of the Company and eliminations of inter-segment amounts, have been aggregated and included in the Other segment, which provides broad administrative support to the two core segments, namely the Consumer and Business Banking and the Commercial Banking segments. The Company utilizes an internal reporting process to measure the performance of the three operating segments within the Company. The internal reporting process derives operating segment results by utilizing allocation methodologies for 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 booked to the segment directly associated with the loans charged off, and the provision for credit losses is booked to segments based on 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. The Company’s internal FTP process is also managed by the corporate treasury function within the Other segment. The process is formulated with the goal of encouraging loan and deposit growth that is consistent with the Company’s overall profitability objectives, as well as to provide a reasonable and consistent basis for the measurement of its business segments’ net interest margins and profitability. The FTP process charges a cost to fund loans (“FTP charges for loans”) and allocates credits for funds provided from deposits (“FTP credits for deposits”) using internal FTP rates. FTP charges for loans are determined based on a matched cost of funds, which is tied to the pricing and term characteristics of the loans. FTP credits for deposits are based on matched funding credit rates, which are tied to the implied or stated maturity of the deposits. FTP credits for deposits reflect the long-term value generated by the deposits. The net spread between the total internal FTP charges and credits is recorded as part of net interest income in the Other segment. The FTP process transfers the corporate interest rate risk exposure to the treasury function within the Other segment, where such exposures are centrally managed. The Company’s internal FTP assumptions and methodologies are reviewed at least annually to ensure that the process is reflective of current market conditions. The following tables present the operating results and other key financial measures for the individual operating segments as of and for the three months ended March 31, 2021 and 2020: ($ in thousands) Consumer and Commercial Other Total Three Months Ended March 31, 2021 Net interest income before (reversal of) provision for credit losses $ 149,899 $ 177,092 $ 26,704 $ 353,695 (Reversal of) provision for credit losses (4,249) 4,249 — — Noninterest income 20,828 50,010 2,028 72,866 Noninterest expense 89,286 69,257 32,534 191,077 Segment income (loss) before income taxes 85,690 153,596 (3,802) 235,484 Segment net income $ 61,378 $ 110,080 $ 33,536 $ 204,994 As of March 31, 2021 Segment assets $ 14,147,094 $ 27,222,272 $ 15,504,780 $ 56,874,146 ($ in thousands) Consumer and Commercial Other Total Three Months Ended March 31, 2020 Net interest income before provision for credit losses $ 152,591 $ 183,501 $ 26,615 $ 362,707 Provision for credit losses 7,788 66,082 — 73,870 Noninterest income 16,402 32,456 6,648 55,506 Noninterest expense 86,964 70,126 23,243 180,333 Segment income before income taxes 74,241 79,749 10,020 164,010 Segment net income $ 53,195 $ 57,131 $ 34,498 $ 144,824 As of March 31, 2020 Segment assets $ 11,894,691 $ 26,412,726 $ 7,641,128 $ 45,948,545

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsOn April 22, 2021, the Company’s Board of Directors declared second quarter 2021 cash dividends for the Company’s common stock. The common stock cash dividend of $0.33 per share is payable on May 17, 2021 to stockholders of record as of May 3, 2021.

Current Accounting Developmen_2

Current Accounting Developments (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Consolidation	East West Bancorp, Inc. (referred to herein on an unconsolidated basis as “East West” and on a consolidated basis as the “Company”) is a registered bank holding company that offers a full range of banking services to individuals and businesses through its subsidiary bank, East West Bank and its subsidiaries (“East West Bank” or the “Bank”). The unaudited interim Consolidated Financial Statements in this Quarterly Report on Form 10-Q (“this Form 10-Q”) include the accounts of East West, East West Bank and East West’s subsidiaries. Intercompany transactions and accounts have been eliminated in consolidation. As of March 31, 2021, East West also has six wholly owned subsidiaries that are statutory business trusts (the “Trusts”). In accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 810, Consolidation , the Trusts are not included on the Consolidated Financial Statements.
Basis of Presentation	The unaudited interim Consolidated Financial Statements are presented in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”), applicable guidelines prescribed by regulatory authorities and general practices in the banking industry. They reflect all adjustments that, in the opinion of management, are necessary for fair presentation of the interim Consolidated Financial Statements. Certain items on the Consolidated Financial Statements and notes for the prior periods have been reclassified to conform to the current period presentation.
New Accounting Pronouncements Adopted	New Accounting Pronouncements Adopted Standard Required Date of Adoption Description Effect on Financial Statements Standards Adopted in 2021 ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting and subsequent related ASU 2021-01, Reference Rate Reform (Topic 848): Scope Effective for all entities from the dates of issuance through December 31, 2022. In March 2020, the FASB issued an ASU related to contracts or hedging relationships that reference London Interbank Offered Rate (“LIBOR”) or other reference rates that are expected to be discontinued due to reference rate reform. This ASU provides temporary optional expedients and exceptions regarding the accounting requirements related to the modification of certain contracts, hedging relationships and other transactions that are affected by the reference rate reform. The guidance permits the Company to make a one-time election to sell and/or transfer qualifying held-to-maturity securities, and not to apply modification accounting or remeasure lease payments in lease contracts if the changes to the contract are related to the discontinuation of the reference rate. If certain criteria are met, the amendments also allow exceptions to the de-designation criteria of the hedging relationships and the assessment of hedge effectiveness during the transition period. This one time election may be made at any time after March 12, 2020, but no later than December 31, 2022. In January 2021, the FASB issued ASU 2021-01 as subsequent amendments, which expanded the scope of Topic 848 to include all affected derivatives and clarified certain optional expedients and exceptions regarding the hedge accounting for derivative contracts affected by the discounting transition. The amendments of this guidance could be elected retrospectively or prospectively to new modifications made on or after the date of issuance of this ASU, January 7, 2021. The Company adopted this guidance on a prospective basis in January 2021. At the time of adoption, the guidance did not have a material impact on the Company’s Consolidated Financial Statements. The Company will continue to track the exposure as of each reporting period and to assess the impact as the reference rate transition occurs through the cessation of LIBOR. ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes January 1, 2021 Early adoption is permitted on January 1, 2020. This ASU simplifies the accounting for income taxes by removing certain exceptions to the existing guidance. This includes removing exceptions to: 1) the incremental approach for intraperiod tax allocation, 2) the requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment, 3) the ability not to recognize a deferred tax liability when a foreign equity method investment becomes a subsidiary, and 4) the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. In addition, this ASU simplifies the accounting for income taxes related to franchise taxes, the tax basis of goodwill and the method for recognizing an enacted change in tax laws. This ASU also specifies that an entity is not required to allocate the consolidated amount of tax expense to a legal entity that is not subject to tax in its separate financial statements. This ASU also makes improvements in the accounting for income taxes related to employee stock ownership plans and equity method investments in qualified affordable housing projects. This guidance should be applied on either a retrospective, modified retrospective or prospective basis depending on the amendments. The Company adopted this guidance in January 2021 using the transition guidance prescribed by this ASU. At the time of adoption, this guidance did not have a material impact on the Company’s Consolidated Financial Statements.
Fair Value Determination	Fair Value Determination Fair value is defined as the price that would be received to sell an asset or the price that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. In determining the fair value of financial instruments, the Company uses various methods including market and income approaches. Based on these approaches, the Company utilizes certain assumptions that market participants would use in pricing an asset or a liability. These inputs can be readily observable, market corroborated or generally unobservable. The Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy noted below is based on the quality and reliability of the information used to determine fair value. The fair value hierarchy gives the highest priority to quoted prices available in active markets and the lowest priority to prices derived from data lacking transparency. The fair value of the Company’s assets and liabilities is classified and disclosed in one of the following three categories: • Level 1 — Valuation is based on quoted prices for identical instruments traded in active markets. • Level 2 — Valuation is based on quoted prices for similar instruments traded in active markets; quoted prices for identical or similar instruments traded in markets that are not active; and model-derived valuations whose inputs are observable and can be corroborated by market data. • Level 3 — Valuation is based on significant unobservable inputs for determining the fair value of assets or liabilities. These significant unobservable inputs reflect assumptions that market participants may use in pricing the assets or liabilities. The classification of assets and liabilities within the hierarchy is based on whether inputs to the valuation methodology used are observable or unobservable, and the significance of those inputs in the fair value measurement. The Company’s assets and liabilities are classified in their entirety based on the lowest level of input that is significant to their fair value measurements.
Balance Sheet Offsetting	The Company’s resale and repurchase agreements are transacted under legally enforceable master repurchase 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
Cash Flow Hedges	For cash flow hedges, the entire change in the fair value of the hedging instruments is recognized in AOCI and reclassified to earnings in the same period when the hedged cash flows impact earnings. Reclassified gains and losses on interest rate swaps are recorded in the same line item as the interest payments of the hedged long-term borrowings within Interest expense in the Consolidated Statements of Income.
Credit Quality Indicators	Credit Quality Indicators All loans are subject to the Company’s credit review and monitoring. For the commercial portfolio, loans are risk rated based on an analysis of the borrower’s current payment performance or delinquency, repayment sources, financial and liquidity factors, including industry and geographic considerations. For the majority of the consumer portfolio, payment performance or delinquency is the driving indicator for the risk ratings. For the Company’s internal credit risk ratings, each individual loan is given a risk rating of 1 through 10. Loans risk rated 1 through 5 are assigned an internal risk rating of “Pass,” with loans risk rated 1 being fully secured by cash or U.S. government and its agencies. Pass loans have sufficient sources of repayment to repay the loan in full, in accordance with all terms and conditions. Loans assigned a risk rating of 6 have potential weaknesses that warrant closer attention by management; these are assigned an internal risk rating of “Special Mention.” Loans assigned a risk rating of 7 or 8 have well-defined weaknesses that may jeopardize the full and timely repayment of the loan; these are assigned an internal risk rating of “Substandard.” Loans assigned a risk rating of 9 have insufficient sources of repayment and a high probability of loss; these are assigned an internal risk rating of “Doubtful.” Loans assigned a risk rating of 10 are uncollectable and of such little value that they are no longer considered bankable assets; these are assigned an internal risk rating of “Loss.” 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 and ongoing basis, and adjusts the ratings based on changes in the borrowers’ financial status and the collectability of the loans.
Allowance for Credit Losses	Allowance for Credit Losses The Company has an allowance framework under ASU 2016-13 for all financial assets measured at amortized cost and certain off-balance sheet credit exposures. The measurement of the allowance for credit losses is based on management’s best estimate of lifetime expected credit losses inherent in the Company’s relevant financial assets. 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, and deferred fees and costs. Subsequent changes in expected credit losses are recognized in net income as a provision for credit loss expense or a reversal of credit loss expense. The process of the allowance for credit losses involves procedures to consider the unique risk characteristics of the portfolio segments. The majority of the Company’s credit exposures share risk characteristics with other similar exposures, and as a result are collectively evaluated. The collectively evaluated loans cover performing risk-rated 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. The individually assessed loans cover loans modified in a TDR, collateral-dependent loans, as well as, risk-rated loans that have been placed on nonaccrual status. Allowance for Collectively Evaluated Loans The allowance for collectively evaluated loans consists of a quantitative component that assesses many different risk factors that we consider 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 allowance for loan losses is estimated using quantitative methods that consider a variety of factors such as historical loss experience, the current credit quality of the portfolio, as well as an economic outlook over the life of the loan. The Company incorporates forward-looking information using macroeconomic scenarios applied over the forecasted life of the loans. The forward-looking information is limited to the reasonable and supportable period. These macroeconomic scenarios include variables that are considered key drivers of increases and decreases in credit losses. The Company utilizes a probability-weighted multiple scenario forecast approach. These scenarios may consist of a base forecast representing management's view of the most likely outcome, combined with downside and upside scenarios reflecting possible worsening or improving economic conditions. A probability-weighted average of these macroeconomic scenarios over a reasonable and supportable forecast period is incorporated into the quantitative models. If the loans’ life extends beyond the reasonable and supportable forecast period, then historical experience, or long-run macroeconomic trends is considered over the remaining life of the loans in estimation of the allowance for loan losses. 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 adversely classified or rated financial assets; • The Company’s lending policies and procedures, including changes in lending strategies, underwriting standards, collection, write-off and recovery practices, • Knowledge of the borrower’s operations; • The quality of the Company’s credit review system; • The experience, ability and depth of the Company’s management, lending staff and other relevant staff; • The effect of other external factors such as the regulatory, legal and technological environments; and • Actual and expected changes in international, national, regional, and local economic and business conditions in which the Company operates, including the actual and expected conditions of various market segments. 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 changes in these factors diverge from period to period. For the three months ended March 31, 2021 and 2020, there were no changes to the reasonable and supportable forecast period and reversion to historical loss experience method. 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 Internal risk rating; size and credit spread at origination, and time to maturity Unemployment rate, and two and ten year treasury spread CRE, Multifamily residential, and Construction and land Delinquency status; maturity date; collateral value; property type, and geographic location Unemployment rate; GDP, and U.S. Treasury rates Single-family residential and HELOCs FICO; delinquency status; maturity date; collateral value, and geographic location Unemployment rate; GDP, and home price index Other consumer Historical loss experience Immaterial (1) (1) Macroeconomic variables are included in the qualitative estimate. Allowance for Loan Losses for the Commercial Loan Portfolio — The Company’s C&I loan lifetime loss rate model estimates credit losses by estimating a loss rate expected over the life of a loan. This loss rate is applied to the amortized cost basis, excluding accrued interest 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. For CRE loans, projected probability of defaults (“PDs”) and loss given defaults (“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. Within the reasonable and supportable period, the forecast of future economic conditions returns to long-run historical economic trends. In order to estimate the life of a loan under both models, the contractual term of the loan is adjusted for estimated prepayments, which are based on historical prepayment experience. Allowance for Loan Losses for the Consumer Loan Portfolio — For single-family residential and HELOC loans, 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. Within the reasonable and supportable period, the forecast of future economic conditions returns to long-run historical economic trends. For other consumer loans, the Company uses a loss rate approach. In order to estimate the life of a loan, the contractual term of the loan is adjusted for estimated prepayments, which are based on historical prepayment experience. Qualitative Allowance for Collectively Evaluated Loans — 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. The allowance for loan losses as of March 31, 2021 and December 31, 2020 also included qualitative adjustments for certain industry sectors, such as oil & gas, included as part of the C&I loan portfolio. Allowance for Individually Evaluated Loans When a loan no longer shares similar risk characteristics with other loans, such as in the case for certain nonaccrual or TDR loans, the Company estimates the allowance for loan losses on an individual loan basis. The allowance for loan losses for individually evaluated loans is measured as the difference between the recorded value of the loans and their fair value. For loans evaluated individually, the Company uses one of three different asset valuation measurement methods: (1) the fair value of collateral less costs to sell; (2) the present value of expected future cash flows; and (3) the loan's observable market price. If an individually evaluated loan is determined to be collateral dependent, the Company applies the fair value of the collateral less costs to sell method. If an individually evaluated loan is determined not to be collateral dependent, the Company uses the present value of future cash flows or the observable market value of the loan.
Investments in Qualified Affordable Housing Partnerships, Net and Investments in Tax Credit and Other Investments, Net	The Company records its investments in qualified affordable housing partnerships, net, using the proportional amortization method. Under the proportional amortization method, the Company amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received, and recognizes the amortization in Income tax expense on the Consolidated Statement of Income. Tax credit investments are evaluated for possible OTTI on an annual basis or when events or changes in circumstances suggest that the carrying amount of the tax credit investments may not be realizable. OTTI charges are recorded within Amortization of tax credit and other investments, net on the Consolidated Statement of Income. Refer to Note 3 — Fair Value Measurement and Fair Value of Financial Instruments
Variable Interest Entities	Variable Interest Entities The Company invests in unconsolidated limited partnerships and similar entities that construct, own and operate affordable housing, historic rehabilitation, wind and solar projects, of which the majority of such investments are variable interest entities (“VIEs”). As a limited partner in these partnerships, these investments are designed to generate a return primarily through the realization of federal tax credits and tax benefits. An unrelated third party is typically the general partner or managing member who has control over the significant activities of such investments. While the Company’s interest in some of the investments may exceed 50% of the outstanding equity interests, the Company does not consolidate these structures due to the general partner or managing member’s ability to manage the entity, which is indicative of power over them. The Company’s maximum exposure to loss in connection with these partnerships consist of the unamortized investment balance and any tax credits claimed that may become subject to recapture.
Goodwill and Core Deposit Intangibles	The Company’s annual goodwill impairment testing is performed as of December 31 of each year, 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. Additional information pertaining to our accounting policy for goodwill is summarized in Note 1 — Summary of Significant Accounting Policies — Goodwill and Other Intangible Assets to the Consolidated Financial Statements of the Company’s 2020 Form 10-K.
Amortization Expense of Core Deposit Intangibles	The Company amortizes the core deposit intangibles based on the projected useful lives of the related deposits.
Litigation	Litigation — The Company is a party to various legal actions arising in the 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.
Share-based Compensation	Compensation costs are calculated using the quoted market price of the Company’s common stock at the grant date. Compensation costs for certain time-based awards that will be settled in cash are adjusted to fair value based on changes in the share price of the Company’s common stock up to the settlement date. For performance-based RSUs, the compensation costs are based on grant date fair value which considers both performance and market conditions, and is subject to subsequent adjustments based on the Company’s outcome of meeting the performance criteria at the end of performance period. Compensation costs of both time-based and performance-based awards are estimated based on awards ultimately expected to vest, and are recognized net of estimated forfeitures on a straight-line basis from the grant date until the vesting date of each grant. For accounting on stock-based compensation plans, see Note 1 — Summary of Significant Accounting Policies — Stock-Based Compensation to the Consolidated Financial Statements of the Company’s 2020 Form 10-K for additional information.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities (Policies)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash Flow Hedges	For cash flow hedges, the entire change in the fair value of the hedging instruments is recognized in AOCI and reclassified to earnings in the same period when the hedged cash flows impact earnings. Reclassified gains and losses on interest rate swaps are recorded in the same line item as the interest payments of the hedged long-term borrowings within Interest expense in the Consolidated Statements of Income.

Current Accounting Developmen_3

Current Accounting Developments (Tables)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
New Accounting Pronouncements Adopted	New Accounting Pronouncements Adopted Standard Required Date of Adoption Description Effect on Financial Statements Standards Adopted in 2021 ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting and subsequent related ASU 2021-01, Reference Rate Reform (Topic 848): Scope Effective for all entities from the dates of issuance through December 31, 2022. In March 2020, the FASB issued an ASU related to contracts or hedging relationships that reference London Interbank Offered Rate (“LIBOR”) or other reference rates that are expected to be discontinued due to reference rate reform. This ASU provides temporary optional expedients and exceptions regarding the accounting requirements related to the modification of certain contracts, hedging relationships and other transactions that are affected by the reference rate reform. The guidance permits the Company to make a one-time election to sell and/or transfer qualifying held-to-maturity securities, and not to apply modification accounting or remeasure lease payments in lease contracts if the changes to the contract are related to the discontinuation of the reference rate. If certain criteria are met, the amendments also allow exceptions to the de-designation criteria of the hedging relationships and the assessment of hedge effectiveness during the transition period. This one time election may be made at any time after March 12, 2020, but no later than December 31, 2022. In January 2021, the FASB issued ASU 2021-01 as subsequent amendments, which expanded the scope of Topic 848 to include all affected derivatives and clarified certain optional expedients and exceptions regarding the hedge accounting for derivative contracts affected by the discounting transition. The amendments of this guidance could be elected retrospectively or prospectively to new modifications made on or after the date of issuance of this ASU, January 7, 2021. The Company adopted this guidance on a prospective basis in January 2021. At the time of adoption, the guidance did not have a material impact on the Company’s Consolidated Financial Statements. The Company will continue to track the exposure as of each reporting period and to assess the impact as the reference rate transition occurs through the cessation of LIBOR. ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes January 1, 2021 Early adoption is permitted on January 1, 2020. This ASU simplifies the accounting for income taxes by removing certain exceptions to the existing guidance. This includes removing exceptions to: 1) the incremental approach for intraperiod tax allocation, 2) the requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment, 3) the ability not to recognize a deferred tax liability when a foreign equity method investment becomes a subsidiary, and 4) the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. In addition, this ASU simplifies the accounting for income taxes related to franchise taxes, the tax basis of goodwill and the method for recognizing an enacted change in tax laws. This ASU also specifies that an entity is not required to allocate the consolidated amount of tax expense to a legal entity that is not subject to tax in its separate financial statements. This ASU also makes improvements in the accounting for income taxes related to employee stock ownership plans and equity method investments in qualified affordable housing projects. This guidance should be applied on either a retrospective, modified retrospective or prospective basis depending on the amendments. The Company adopted this guidance in January 2021 using the transition guidance prescribed by this ASU. At the time of adoption, this guidance did not have a material impact on the Company’s Consolidated Financial Statements.

Fair Value Measurement and Fa_2

Fair Value Measurement and Fair Value of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value, Financial Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Schedule of financial assets (liabilities) measured at fair value on a recurring basis	The following tables present financial assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2021 and December 31, 2020: ($ in thousands) Assets and Liabilities Measured at Fair Value on a Recurring Basis Quoted Prices in Significant Significant Total AFS debt securities: U.S. Treasury securities $ 826,342 $ — $ — $ 826,342 U.S. government agency and U.S. government-sponsored enterprise debt securities — 1,194,005 — 1,194,005 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities — 1,169,391 — 1,169,391 Residential mortgage-backed securities — 2,247,406 — 2,247,406 Municipal securities — 420,065 — 420,065 Non-agency mortgage-backed securities: Commercial mortgage-backed securities — 281,027 — 281,027 Residential mortgage-backed securities — 523,500 — 523,500 Corporate debt securities — 496,643 — 496,643 Foreign government bonds — 276,328 — 276,328 Asset-backed securities — 63,040 — 63,040 Collateralized loan obligations (“CLOs”) — 291,466 — 291,466 Total AFS debt securities $ 826,342 $ 6,962,871 $ — $ 7,789,213 Investments in tax credit and other investments: Equity securities (1) $ 22,233 $ 4,460 $ — $ 26,693 Total investments in tax credit and other investments $ 22,233 $ 4,460 $ — $ 26,693 Derivative assets: Interest rate contracts $ — $ 319,049 $ — $ 319,049 Foreign exchange contracts — 39,562 — 39,562 Credit contracts — 5 — 5 Equity contracts — — 272 272 Commodity contracts — 98,429 — 98,429 Gross derivative assets $ — $ 457,045 $ 272 $ 457,317 Netting adjustments (2) $ — $ (108,235) $ — $ (108,235) Net derivative assets $ — $ 348,810 $ 272 $ 349,082 Derivative liabilities: Interest rate contracts $ — $ 230,290 $ — $ 230,290 Foreign exchange contracts — 27,287 — 27,287 Credit contracts — 153 — 153 Commodity contracts — 86,405 — 86,405 Gross derivative liabilities $ — $ 344,135 $ — $ 344,135 Netting adjustments (2) $ — $ (186,687) $ — $ (186,687) Net derivative liabilities $ — $ 157,448 $ — $ 157,448 (1) Equity securities consist of mutual funds with readily determinable fair values. The Company invested in these mutual funds for CRA purposes. (2) Represents balance sheet netting of derivative assets and liabilities and related cash collateral under master netting agreements or similar agreements. See Note 6 — Derivatives to the Consolidated Financial Statements in this Form 10-Q for additional information. ($ in thousands) Assets and Liabilities Measured at Fair Value on a Recurring Basis Quoted Prices in Significant Significant Total AFS debt securities: U.S. Treasury securities $ 50,761 $ — $ — $ 50,761 U.S. government agency and U.S. government-sponsored enterprise debt securities — 814,319 — 814,319 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities — 1,153,770 — 1,153,770 Residential mortgage-backed securities — 1,660,894 — 1,660,894 Municipal securities — 396,073 — 396,073 Non-agency mortgage-backed securities: Commercial mortgage-backed securities — 239,842 — 239,842 Residential mortgage-backed securities — 289,775 — 289,775 Corporate debt securities — 405,968 — 405,968 Foreign government bonds — 182,531 — 182,531 Asset-backed securities — 63,231 — 63,231 CLOs — 287,494 — 287,494 Total AFS debt securities $ 50,761 $ 5,493,897 $ — $ 5,544,658 Investments in tax credit and other investments: Equity securities (1) $ 22,548 $ 8,724 $ — $ 31,272 Total investments in tax credit and other investments $ 22,548 $ 8,724 $ — $ 31,272 Derivative assets: Interest rate contracts $ — $ 489,132 $ — $ 489,132 Foreign exchange contracts — 30,300 — 30,300 Credit contracts — 13 — 13 Equity contracts — 585 273 858 Commodity contracts — 82,451 — 82,451 Gross derivative assets $ — $ 602,481 $ 273 $ 602,754 Netting adjustments (2) $ — $ (101,512) $ — $ (101,512) Net derivative assets $ — $ 500,969 $ 273 $ 501,242 Derivative liabilities: Interest rate contracts $ — $ 317,698 $ — $ 317,698 Foreign exchange contracts — 22,759 — 22,759 Credit contracts — 206 — 206 Commodity contracts — 84,165 — 84,165 Gross derivative liabilities $ — $ 424,828 $ — $ 424,828 Netting adjustments (2) $ — $ (184,697) $ — $ (184,697) Net derivative liabilities $ — $ 240,131 $ — $ 240,131 (1) Equity securities consist of mutual funds with readily determinable fair values. The Company invested in these mutual funds for CRA purposes. (2) Represents balance sheet netting of derivative assets and liabilities and related cash collateral under master netting agreements or similar agreements. See Note 6 — Derivatives to the Consolidated Financial Statements in this Form 10-Q for additional information.
Reconciliation of the beginning and ending balances for equity warrants measured at fair value on a recurring basis using significant unobservable inputs (Level 3)	The following table provides a reconciliation of the beginning and ending balances of these equity warrants for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 2020 Equity Contracts Beginning balance $ 273 $ 421 Total (losses) gains included in earnings (1) (1) 292 Ending balance $ 272 $ 713 (1) Includes unrealized (losses) gains of $(1) thousand and $292 thousand for the three months ended March 31, 2021 and 2020, respectively. The realized/unrealized gains (losses) of equity warrants are included in Lending fees on the Consolidated Statement of Income.
Schedule of the carrying and fair value estimates per the fair value hierarchy of financial instruments measured on a nonrecurring basis	The following tables present the fair value estimates for financial instruments as of March 31, 2021 and December 31, 2020, excluding financial instruments recorded at fair value on a recurring basis as they are included in the tables presented elsewhere in this Note. The carrying amounts in the following tables are recorded on the Consolidated Balance Sheet under the indicated captions, except for accrued interest receivable and mortgage servicing rights that are included in Other assets , and accrued interest payable that is included in Accrued expenses and other liabilities . These financial assets and liabilities are measured at amortized cost basis on the Company’s Consolidated Balance Sheet. ($ in thousands) March 31, 2021 Carrying Level 1 Level 2 Level 3 Estimated Financial assets: Cash and cash equivalents $ 4,619,133 $ 4,619,133 $ — $ — $ 4,619,133 Interest-bearing deposits with banks $ 741,923 $ — $ 741,923 $ — $ 741,923 Resale agreements $ 2,160,038 $ — $ 2,152,392 $ — $ 2,152,392 Restricted equity securities, at cost $ 83,250 $ — $ 83,250 $ — $ 83,250 Loans held-for-investment, net $ 38,981,242 $ — $ — $ 38,922,550 $ 38,922,550 Mortgage servicing rights $ 5,506 $ — $ — $ 8,740 $ 8,740 Accrued interest receivable $ 149,953 $ — $ 149,953 $ — $ 149,953 Financial liabilities: Demand, checking, savings and money market deposits $ 40,748,303 $ — $ 40,748,303 $ — $ 40,748,303 Time deposits $ 8,798,833 $ — $ 8,811,048 $ — $ 8,811,048 FHLB advances $ 653,035 $ — $ 657,460 $ — $ 657,460 Repurchase agreements $ 300,000 $ — $ 316,099 $ — $ 316,099 Long-term debt $ 147,445 $ — $ 151,015 $ — $ 151,015 Accrued interest payable $ 9,966 $ — $ 9,966 $ — $ 9,966 ($ in thousands) December 31, 2020 Carrying Level 1 Level 2 Level 3 Estimated Financial assets: Cash and cash equivalents $ 4,017,971 $ 4,017,971 $ — $ — $ 4,017,971 Interest-bearing deposits with banks $ 809,728 $ — $ 809,728 $ — $ 809,728 Resale agreements $ 1,460,000 $ — $ 1,464,635 $ — $ 1,464,635 Restricted equity securities, at cost $ 83,046 $ — $ 83,046 $ — $ 83,046 Loans held-for-sale $ 1,788 $ — $ 1,788 $ — $ 1,788 Loans held-for-investment, net $ 37,770,972 $ — $ — $ 37,803,940 $ 37,803,940 Mortgage servicing rights $ 5,522 $ — $ — $ 8,435 $ 8,435 Accrued interest receivable $ 150,140 $ — $ 150,140 $ — $ 150,140 Financial liabilities: Demand, checking, savings and money market deposits $ 35,862,403 $ — $ 35,862,403 $ — $ 35,862,403 Time deposits $ 9,000,349 $ — $ 9,016,884 $ — $ 9,016,884 Short-term borrowings $ 21,009 $ — $ 21,009 $ — $ 21,009 FHLB advances $ 652,612 $ — $ 659,631 $ — $ 659,631 Repurchase agreements $ 300,000 $ — $ 317,850 $ — $ 317,850 Long-term debt $ 147,376 $ — $ 150,131 $ — $ 150,131 Accrued interest payable $ 11,956 $ — $ 11,956 $ — $ 11,956
Fair Value, Measurements, Recurring
Fair Value, Financial Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Schedule of quantitative information about significant unobservable inputs used in the valuation of Level 3 fair value measurements	The following table presents quantitative information about the significant unobservable inputs used in the valuation of Level 3 fair value measurements as of March 31, 2021 and December 31, 2020, respectively. The significant unobservable inputs presented in the table below are those that the Company considers significant to the fair value of the Level 3 assets. The Company considers unobservable inputs to be significant if, by their exclusion, the fair value of the Level 3 assets would be impacted by a predetermined percentage change. ($ in thousands) Fair Value Valuation Unobservable Range of Inputs Weighted- Average (1) March 31, 2021 Derivative assets: Equity contracts $ 272 Black-Scholes option pricing model Equity volatility 48% — 56% 52% Liquidity discount 47% 47% December 31, 2020 Derivative assets: Equity contracts $ 273 Black-Scholes option pricing model Equity volatility 46% — 61% 53% Liquidity discount 47% 47% (1) Weighted-average is calculated based on the fair value of equity warrants as of March 31, 2021 and December 31, 2020.
Fair Value, Measurements, Nonrecurring
Fair Value, Financial Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Schedule of quantitative information about significant unobservable inputs used in the valuation of Level 3 fair value measurements	The following table presents the quantitative information about the significant unobservable inputs used in the valuation of Level 3 fair value measurements that are measured on a nonrecurring basis as of March 31, 2021 and December 31, 2020: ($ in thousands) Fair Value Valuation Unobservable Range of Weighted- Average of Inputs (1) March 31, 2021 Loans held-for-investment $ 108,918 Discounted cash flows Discount 4% — 15% 11% $ 24,356 Fair value of collateral Discount 10% — 20% 15% $ 9,902 Fair value of collateral Contract value NM NM $ 59,407 Fair value of property Selling cost 8% — 26% 9% December 31, 2020 Loans held-for-investment $ 104,783 Discounted cash flows Discount 3% — 15% 11% $ 22,207 Fair value of collateral Discount 10% — 26% 15% $ 15,879 Fair value of collateral Contract value NM NM $ 46,993 Fair value of property Selling cost 7% — 26% 10% Investments in tax credit and other investments, net $ 3,140 Individual analysis of each investment Expected future tax benefits and distributions NM NM OREO $ 15,824 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 March 31, 2021 and December 31, 2020.
Schedule of carrying amounts of assets that were still held and had fair value changes measured on a nonrecurring basis	The following tables present the carrying amounts of assets that were still held and had fair value changes measured on a nonrecurring basis as of March 31, 2021 and December 31, 2020: ($ in thousands) Assets Measured at Fair Value on a Nonrecurring Basis Quoted Prices in Significant Significant Fair Value Loans held-for-investment: Commercial: Commercial and industrial (“C&I”) $ — $ — $ 143,630 $ 143,630 Commercial real estate (“CRE”): CRE — — 47,639 47,639 Multifamily residential — — 2,332 2,332 Construction and land — — 4,191 4,191 Total commercial — — 197,792 197,792 Consumer: Residential mortgage: Home equity lines of credit (“HELOCs”) — — 4,791 4,791 Total consumer — — 4,791 4,791 Total loans held-for-investment $ — $ — $ 202,583 $ 202,583 ($ in thousands) Assets Measured at Fair Value on a Nonrecurring Basis Quoted Prices in Significant Significant Fair Value Loans held-for-investment: Commercial: C&I $ — $ — $ 143,331 $ 143,331 CRE: CRE — — 42,894 42,894 Total commercial — — 186,225 186,225 Consumer: Residential mortgage: HELOCs — — 1,146 1,146 Other consumer — — 2,491 2,491 Total consumer — — 3,637 3,637 Total loans held-for-investment $ — $ — $ 189,862 $ 189,862 Investments in tax credit and other investments, net $ — $ — $ 3,140 $ 3,140 OREO (1) $ — $ — $ 15,824 $ 15,824 (1) Amounts are included in Other assets on the Consolidated Balance Sheet and represent the carrying value of OREO properties that were written down subsequent to their initial classification as OREO.
Schedule of increase (decrease) in fair value of assets for which a fair value adjustment has been recognized, nonrecurring basis	The following table presents the increase (decrease) in fair value of assets for which a nonrecurring fair value adjustment has been recognized for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 2020 Loans held-for-investment: Commercial: C&I $ (5,309) $ (21,501) CRE: CRE (7,062) (5) Multifamily residential (16) — Construction and land (71) — Total commercial (12,458) (21,506) Consumer: Residential mortgage: HELOCs (37) (193) Other consumer — 2,491 Total consumer (37) 2,298 Total loans held-for-investment $ (12,495) $ (19,208) Investments in tax credit and other investments, net $ — $ 150 Other nonperforming assets $ (3,890) $ (300)

Assets Purchased under Resale_2

Assets Purchased under Resale Agreements and Sold under Repurchase Agreements (Tables)	3 Months Ended
	Mar. 31, 2021
RESALE AND REPURCHASE AGREEMENTS [Abstract]
Schedule of balance sheet offsetting for resale and repurchase agreements	The following tables present the resale and repurchase agreements included on the Consolidated Balance Sheet as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 Gross Gross Amounts Net Amounts of Gross Amounts Not Offset on the Assets Net Collateral Received Resale agreements $ 2,160,038 $ — $ 2,160,038 $ (2,138,721) (1) $ 21,317 Gross Gross Amounts Net Amounts of Gross Amounts Not Offset on the Liabilities Net Collateral Pledged Repurchase agreements $ 300,000 $ — $ 300,000 $ (300,000) (2) $ — ($ in thousands) December 31, 2020 Gross Gross Amounts Net Amounts of Gross Amounts Not Offset on the Assets Net Collateral Received Resale agreements $ 1,460,000 $ — $ 1,460,000 $ (1,458,700) (1) $ 1,300 Gross Gross Amounts Net Amounts of Gross Amounts Not Offset on the Liabilities Net Collateral Pledged Repurchase agreements $ 300,000 $ — $ 300,000 $ (300,000) (2) $ — (1) Represents the fair value of securities the Company has received under resale agreements, limited to the amount of the recognized asset due from each counterparty for presentation purposes. The application of collateral cannot reduce the net position below zero. Therefore, excess collateral, if any, is not reflected above. (2) Represents the fair value of securities the Company has pledged under repurchase agreements, limited to the amount of the recognized liability due to each counterparty for presentation purpose. The application of collateral cannot reduce the net position below zero. Therefore, excess collateral, if any, is not reflected above.

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Schedule of amortized cost, gross unrealized gains and losses, and fair value by major categories of AFS debt securities	The following tables present the amortized cost, gross unrealized gains and losses and fair value by major categories of AFS debt securities as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 Amortized Gross Gross Fair AFS debt securities: U.S. Treasury securities $ 841,711 $ 328 $ (15,697) $ 826,342 U.S. government agency and U.S. government-sponsored enterprise debt securities 1,236,446 5,145 (47,586) 1,194,005 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 1,178,238 16,407 (25,254) 1,169,391 Residential mortgage-backed securities 2,271,645 17,026 (41,265) 2,247,406 Municipal securities 417,676 7,348 (4,959) 420,065 Non-agency mortgage-backed securities: Commercial mortgage-backed securities 281,099 4,311 (4,383) 281,027 Residential mortgage-backed securities 525,560 1,599 (3,659) 523,500 Corporate debt securities 517,309 4,677 (25,343) 496,643 Foreign government bonds 278,100 320 (2,092) 276,328 Asset-backed securities 62,762 292 (14) 63,040 CLOs 294,000 — (2,534) 291,466 Total AFS debt securities $ 7,904,546 $ 57,453 $ (172,786) $ 7,789,213 ($ in thousands) December 31, 2020 Amortized Gross Gross Fair AFS debt securities: U.S. Treasury securities $ 50,310 $ 451 $ — $ 50,761 U.S. government agency and U.S. government-sponsored enterprise debt securities 806,814 8,765 (1,260) 814,319 U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 1,125,174 34,306 (5,710) 1,153,770 Residential mortgage-backed securities 1,634,553 27,952 (1,611) 1,660,894 Municipal securities 382,573 13,588 (88) 396,073 Non-agency mortgage-backed securities: Commercial mortgage-backed securities 234,965 6,107 (1,230) 239,842 Residential mortgage-backed securities 288,520 1,761 (506) 289,775 Corporate debt securities 406,323 3,493 (3,848) 405,968 Foreign government bonds 183,828 163 (1,460) 182,531 Asset-backed securities 63,463 10 (242) 63,231 CLOs 294,000 — (6,506) 287,494 Total AFS debt securities $ 5,470,523 $ 96,596 $ (22,461) $ 5,544,658
Schedule of fair value and associated gross unrealized losses of AFS debt securities	The following tables present the fair value and the associated gross unrealized losses of the Company’s AFS debt securities, aggregated by investment category and the length of time that the securities have been in a continuous unrealized loss position as of March 31, 2021 and December 31, 2020. ($ in thousands) March 31, 2021 Less Than 12 Months 12 Months or More Total Fair Gross Fair Gross Fair Gross AFS debt securities: U.S. Treasury securities $ 775,801 $ (15,697) $ — $ — $ 775,801 $ (15,697) U.S. government agency and U.S. government sponsored enterprise debt securities 954,894 (47,586) — — 954,894 (47,586) U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 615,193 (25,203) 3,474 (51) 618,667 (25,254) Residential mortgage-backed securities 1,464,574 (41,264) 358 (1) 1,464,932 (41,265) Municipal securities 199,225 (4,959) — — 199,225 (4,959) Non-agency mortgage-backed securities: Commercial mortgage-backed securities 114,971 (4,374) 15,578 (9) 130,549 (4,383) Residential mortgage-backed securities 391,444 (3,659) — — 391,444 (3,659) Corporate debt securities 347,934 (25,316) 9,974 (27) 357,908 (25,343) Foreign government bonds 155,299 (2,092) — — 155,299 (2,092) Asset-backed securities 11,904 (14) — — 11,904 (14) CLOs — — 291,466 (2,534) 291,466 (2,534) Total AFS debt securities $ 5,031,239 $ (170,164) $ 320,850 $ (2,622) $ 5,352,089 $ (172,786) ($ in thousands) December 31, 2020 Less Than 12 Months 12 Months or More Total Fair Gross Fair Gross Fair Gross AFS debt securities: U.S. Treasury securities $ 352,521 $ (1,260) $ — $ — $ 352,521 $ (1,260) U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 292,596 (5,656) 3,543 (54) 296,139 (5,710) Residential mortgage-backed securities 342,561 (1,611) — — 342,561 (1,611) Municipal securities 24,529 (88) — — 24,529 (88) Non-agency mortgage-backed securities: Commercial mortgage-backed securities 58,738 (1,230) 7,920 — 66,658 (1,230) Residential mortgage-backed securities 90,156 (506) — — 90,156 (506) Corporate debt securities 251,674 (3,645) 9,798 (203) 261,472 (3,848) Foreign government bonds 106,828 (1,460) — — 106,828 (1,460) Asset-backed securities — — 34,104 (242) 34,104 (242) CLOs — — 287,494 (6,506) 287,494 (6,506) Total AFS debt securities $ 1,519,603 $ (15,456) $ 342,859 $ (7,005) $ 1,862,462 $ (22,461)
Schedule of the proceeds, gross realized gains, and tax expense related to the sales of AFS debt securities	The following table presents the gross realized gains and tax expense related to the sales of AFS debt securities for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 2020 Gross realized gains $ 192 $ 1,529 Related tax expense $ 57 $ 452
Schedule of contractual maturities of AFS debt securities	The following table presents the contractual maturities of AFS debt securities as of March 31, 2021. Expected maturities will differ from contractual maturities on certain securities as the issuers and borrowers of the underlying collateral may have the right to call or prepay obligations with or without prepayment penalties. ($ in thousands) Amortized Cost Fair Value Due within one year $ 1,403,404 $ 1,347,808 Due after one year through five years 688,387 681,602 Due after five years through ten years 1,427,893 1,414,362 Due after ten years 4,384,862 4,345,441 Total AFS debt securities $ 7,904,546 $ 7,789,213
Schedule of restricted equity securities	The following table presents the restricted equity securities on the Consolidated Balance Sheet as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 December 31, 2020 Federal Reserve Bank of San Francisco (“FRBSF”) stock $ 59,453 $ 59,249 FHLB stock 23,797 23,797 Total restricted equity securities $ 83,250 $ 83,046

Derivatives (Tables)

Derivatives (Tables)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of notional and gross fair values of derivatives	The following table presents the total notional amounts and gross fair values of the Company’s derivatives, as well as the balance sheet netting adjustments on an aggregate basis as of March 31, 2021 and December 31, 2020. The derivative assets and liabilities are presented on a gross basis prior to the application of bilateral collateral and master netting agreements, but after the variation margin payments with central clearing organizations have been applied as settlement, as applicable. Total derivative assets and liabilities are adjusted to take into consideration the effects of legally enforceable master netting agreements and cash collateral received or paid as of March 31, 2021 and December 31, 2020. The resulting net derivative asset and liability fair values are included in Other assets and Accrued expenses and other liabilities , respectively, on the Consolidated Balance Sheet. ($ in thousands) March 31, 2021 December 31, 2020 Notional Fair Value Notional Fair Value Derivative Derivative Derivative Derivative Derivatives designated as hedging instruments: Cash flow hedges: Interest rate contracts $ 275,000 $ — $ 1,258 $ 275,000 $ — $ 1,864 Net investment hedges: Foreign exchange contracts 83,936 908 — 84,269 — 235 Total derivatives designated as hedging instruments $ 358,936 $ 908 $ 1,258 $ 359,269 $ — $ 2,099 Derivatives not designated as hedging instruments: Interest rate contracts $ 17,891,960 $ 319,049 $ 229,032 $ 18,155,678 $ 489,132 $ 315,834 Foreign exchange contracts 4,036,958 38,654 27,287 3,108,488 30,300 22,524 Credit contracts 76,992 5 153 76,992 13 206 Equity contracts — 272 — — 858 — Commodity contracts — 98,429 86,405 — 82,451 84,165 Total derivatives not designated as hedging instruments $ 22,005,910 $ 456,409 $ 342,877 $ 21,341,158 $ 602,754 $ 422,729 Gross derivative assets/liabilities $ 457,317 $ 344,135 $ 602,754 $ 424,828 Less: Master netting agreements (100,454) (100,454) (93,063) (93,063) Less: Cash collateral received/paid (7,781) (86,233) (8,449) (91,634) Net derivative assets/liabilities $ 349,082 $ 157,448 $ 501,242 $ 240,131 (1) The Company held equity contracts in 18 private companies as of March 31, 2021. In comparison, the Company held equity contracts in two public companies and 17 private companies as of December 31, 2020. (2) The notional amount of the Company’s commodity contracts entered with its customers totaled 8,258 thousand barrels of crude oil and 102,996 thousand units of natural gas, measured in million British thermal units (“MMBTUs”) as of March 31, 2021. In comparison, the notional amount of the Company’s commodity contracts entered with its customers totaled 6,321 thousand barrels of crude oil and 109,635 thousand MMBTUs of natural gas as of December 31, 2020. The Company simultaneously entered into the offsetting commodity contracts with mirrored terms with third-party financial institutions. The following tables present the notional amounts and the gross fair values of interest rate derivative contracts outstanding as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 Customer Counterparty ($ in thousands) Financial Counterparty Notional Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Written options $ 800,962 $ — $ 544 Purchased options $ 800,962 $ 551 $ — Sold collars and corridors 531,840 5,849 158 Collars and corridors 531,840 160 5,888 Swaps 7,597,856 279,361 53,975 Swaps 7,628,500 33,128 168,467 Total $ 8,930,658 $ 285,210 $ 54,677 Total $ 8,961,302 $ 33,839 $ 174,355 ($ in thousands) December 31, 2020 Customer Counterparty ($ in thousands) Financial Counterparty Notional Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Written options $ 957,393 $ — $ 115 Purchased options $ 957,393 $ 101 $ 15 Sold collars and corridors 518,477 7,673 — Collars and corridors 518,477 — 7,717 Swaps 7,586,414 479,634 1,364 Swaps 7,617,524 1,724 306,623 Total $ 9,062,284 $ 487,307 $ 1,479 Total $ 9,093,394 $ 1,825 $ 314,355 The following tables present the notional amounts and the gross fair values of foreign exchange derivative contracts outstanding as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 Customer Counterparty ($ in thousands) Financial Counterparty Notional Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Forwards and spot $ 2,468,974 $ 27,803 $ 21,835 Forwards and spot $ 168,942 $ 869 $ 494 Swaps 184,584 1,902 247 Swaps 974,974 7,733 4,364 Written options 116,575 — 336 Purchased options 116,575 336 — Collars 3,167 — 11 Collars 3,167 11 — Total $ 2,773,300 $ 29,705 $ 22,429 Total $ 1,263,658 $ 8,949 $ 4,858 ($ in thousands) December 31, 2020 Customer Counterparty ($ in thousands) Financial Counterparty Notional Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Forwards and spot $ 1,522,888 $ 17,575 $ 17,928 Forwards and spot $ 145,197 $ 1,230 $ 273 Swaps 13,590 872 91 Swaps 1,191,355 10,049 3,658 Written options 117,729 — 574 Purchased options 117,729 574 — Total $ 1,654,207 $ 18,447 $ 18,593 Total $ 1,454,281 $ 11,853 $ 3,931 ($ in thousands) March 31, 2021 December 31, 2020 Notional Fair Value Notional Fair Value Assets Liabilities Assets Liabilities RPAs - protection sold $ 66,278 $ — $ 153 $ 66,278 $ — $ 206 RPAs - protection purchased 10,714 5 — 10,714 13 — Total RPAs $ 76,992 $ 5 $ 153 $ 76,992 $ 13 $ 206 The following tables present the notional amounts and fair values of the commodity derivative positions outstanding as of March 31, 2021 and December 31, 2020: ($ and units in thousands) March 31, 2021 Customer Counterparty ($ and units in thousands) Financial Counterparty Notional Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Crude oil: Crude oil: Written options 248 Barrels $ 211 $ 25 Purchased options 248 Barrels $ — $ 48 Collars 2,361 Barrels 11,181 219 Collars 2,361 Barrels 219 10,989 Swaps 5,649 Barrels 37,076 1,206 Swaps 5,649 Barrels 1,058 28,624 Total 8,258 $ 48,468 $ 1,450 Total 8,258 $ 1,277 $ 39,661 Natural gas: Natural gas: Written options 8,065 MMBTUs $ 52 $ 319 Purchased options 8,065 MMBTUs $ 319 $ 52 Collars 10,823 MMBTUs 879 — Collars 14,023 MMBTUs — 555 Swaps 84,108 MMBTUs 28,878 18,449 Swaps 91,790 MMBTUs 18,556 25,919 Total 102,996 $ 29,809 $ 18,768 Total 113,878 $ 18,875 $ 26,526 Total $ 78,277 $ 20,218 Total $ 20,152 $ 66,187 ($ and units in thousands) December 31, 2020 Customer Counterparty ($ and units in thousands) Financial Counterparty Notional Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Crude oil: Crude oil: Collars 2,022 Barrels $ 2,344 $ 2,193 Collars 2,022 Barrels $ 2,217 $ 2,402 Swaps 4,299 Barrels 9,282 14,283 Swaps 4,299 Barrels 8,220 7,135 Total 6,321 $ 11,626 $ 16,476 Total 6,321 $ 10,437 $ 9,537 Natural gas: Natural gas: Written options 597 MMBTUs $ — $ 59 Purchased options 597 MMBTUs $ 59 $ — Collars 12,733 MMBTUs 1,063 205 Collars 16,293 MMBTUs 205 813 Swaps 96,305 MMBTUs 32,073 27,238 Swaps 103,973 MMBTUs 26,988 29,837 Total 109,635 $ 33,136 $ 27,502 Total 120,863 $ 27,252 $ 30,650 Total $ 44,762 $ 43,978 Total $ 37,689 $ 40,187
Schedule of pre-tax changes in AOCI from cash flows hedges	The following table presents the pre-tax changes in AOCI from cash flow hedges for the three months ended March 31, 2021 and 2020. The after-tax impact of cash flow hedges on AOCI is shown in Note 13 — Accumulated Other Comprehensive Income (Loss) to the Consolidated Financial Statements in this Form-10-Q. ($ in thousands) Three Months Ended March 31, 2021 2020 Gains recognized in AOCI $ 426 $ — (Losses) reclassified from AOCI to interest expense $ (177) $ —
Tabular disclosure of gains and losses on derivative instruments qualified and designated in net investment hedges	The following table presents the after-tax (losses) gains recognized in AOCI on net investment hedges for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 2020 Gains recognized in AOCI $ 101 $ 1,004
Schedule of the net (losses) gains recognized on the Company’s Consolidated Statement of Income related to derivatives not designated as hedging instruments	The following table presents the net gains (losses) recognized on the Company’s Consolidated Statement of Income related to derivatives not designated as hedging instruments for the three months ended March 31, 2021 and 2020: ($ in thousands) Classification on Three Months Ended March 31, 2021 2020 Derivatives not designated as hedging instruments: Interest rate contracts Interest rate contracts and other derivative income $ 13,901 $ (7,011) Foreign exchange contracts Foreign exchange income 10,243 2,861 Credit contracts Interest rate contracts and other derivative income 45 (23) Equity contracts Lending fees 311 309 Commodity contracts Interest rate contracts and other derivative income 169 24 Net gains (losses) $ 24,669 $ (3,840)
Schedule of gross derivative fair values, the balance sheet netting adjustments and the resulting net fair values recorded on the consolidated balance sheet, as well as the cash and non-cash collateral associated with master netting arrangements	The following tables present the gross derivative fair values, the balance sheet netting adjustments and the resulting net fair values recorded on the consolidated balance sheet, as well as the cash and noncash collateral associated with master netting arrangements. The gross amounts of derivative assets and liabilities are presented after the application of variation margin payments as settlements with central counterparties, where applicable. The collateral amounts in the following tables are limited to the outstanding balances of the related asset or liability, after the application of netting; therefore instances of overcollateralization are not shown: ($ in thousands) As of March 31, 2021 Gross Amounts Recognized (1) Gross Amounts Offset on the Net Amounts Gross Amounts Not Offset on the Net Amount Master Netting Arrangements Cash Collateral Received (3) Security Collateral Received (5) Derivative assets $ 457,317 $ (100,454) $ (7,781) $ 349,082 $ — $ 349,082 Gross Amounts Recognized (2) Gross Amounts Offset on the Net Amounts Gross Amounts Not Offset on the Net Amount Master Netting Arrangements Cash Collateral Pledged (4) Security Collateral Pledged (5) Derivative liabilities $ 344,135 $ (100,454) $ (86,233) $ 157,448 $ (64,816) $ 92,632 ($ in thousands) As of December 31, 2020 Gross Amounts Recognized (1) Gross Amounts Offset on the Net Amounts Gross Amounts Not Offset on the Net Master Netting Arrangements Cash Collateral Received (3) Security Collateral Received (5) Derivative assets $ 602,754 $ (93,063) $ (8,449) $ 501,242 $ (35) $ 501,207 Gross Amounts Recognized (2) Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts Gross Amounts Not Offset on the Net Master Netting Arrangements Cash Collateral Pledged (4) Security Collateral Pledged (5) Derivative liabilities $ 424,828 $ (93,063) $ (91,634) $ 240,131 $ (221,150) $ 18,981 (1) Includes $532 thousand and $1.1 million of gross fair value assets with counterparties that were not subject to enforceable master netting arrangements or similar agreements as of March 31, 2021 and December 31, 2020, respectively. (2) Includes $151 thousand and $220 thousand of gross fair value liabilities with counterparties that were not subject to enforceable master netting arrangements or similar agreements as of March 31, 2021 and December 31, 2020, respectively. (3) Gross cash collateral received under master netting arrangements or similar agreements were $11.9 million and $15.8 million as of March 31, 2021 and December 31, 2020, respectively. Of the gross cash collateral received, $7.8 million and $8.4 million were used to offset against derivative assets, respectively, as of March 31, 2021 and December 31, 2020. (4) Gross cash collateral pledged under master netting arrangements or similar agreements were $90.8 million and $91.6 million as of March 31, 2021 and December 31, 2020, respectively. Of the gross cash collateral pledged, $86.2 million and $91.6 million were used to offset against derivative liabilities, respectively, as of March 31, 2021 and December 31, 2020. (5) Represents the fair value of security collateral received and pledged limited to derivative assets and liabilities that are subject to enforceable master netting arrangements or similar agreements. GAAP does not permit the netting of noncash collateral on the consolidated balance sheet but requires disclosure of such amounts.

Loans Receivable and Allowanc_2

Loans Receivable and Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2021
Loans and Leases Receivable Disclosure [Abstract]
Schedule of composition of loans held-for-investment	The following table presents the composition of the Company’s loans held-for-investment as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 December 31, 2020 Commercial: C&I (1) $ 14,081,110 $ 13,631,726 CRE: CRE 11,563,034 11,174,611 Multifamily residential 3,066,515 3,033,998 Construction and land 459,254 599,692 Total CRE 15,088,803 14,808,301 Total commercial 29,169,913 28,440,027 Consumer: Residential mortgage: Single-family residential 8,524,287 8,185,953 HELOCs 1,749,172 1,601,716 Total residential mortgage 10,273,459 9,787,669 Other consumer 145,376 163,259 Total consumer 10,418,835 9,950,928 Total loans held-for-investment (2) $ 39,588,748 $ 38,390,955 Allowance for loan losses (607,506) (619,983) Loans held-for-investment, net (2) $ 38,981,242 $ 37,770,972 (1) Includes Paycheck Protection Program (“PPP”) loans of $2.07 billion and $1.57 billion as of March 31, 2021 and December 31, 2020, respectively. (2) Includes net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts of $(76.9) million and $(58.8) million as of March 31, 2021 and December 31, 2020, respectively. Net origination fees related to PPP loans were $(34.3) million and $(12.7) million as of March 31, 2021 and December 31, 2020, respectively.
Schedule of loans held-for-investment by loan portfolio segments, internal risk ratings and vintage year	The following tables summarize the Company’s loans held-for-investment as of March 31, 2021 and December 31, 2020, presented by loan portfolio segments, internal risk ratings and vintage year. The vintage year is the year of origination, renewal or major modification. ($ in thousands) March 31, 2021 Term Loans Revolving Loans Revolving Loans Converted to Term Loans Amortized Cost Basis Total Amortized Cost Basis by Origination Year 2021 2020 2019 2018 2017 Prior Commercial: C&I: Pass $ 1,661,034 $ 3,043,315 $ 1,220,618 $ 385,813 $ 228,364 $ 280,748 $ 6,492,230 $ 29,327 $ 13,341,449 Criticized (accrual) 55,239 145,506 83,989 29,315 18,541 6,809 274,726 — 614,125 Criticized (nonaccrual) 288 1,540 17,422 21,368 14,858 2,797 67,263 — 125,536 Total C&I 1,716,561 3,190,361 1,322,029 436,496 261,763 290,354 6,834,219 29,327 14,081,110 CRE: CRE: Pass 664,626 2,303,031 2,354,998 2,253,230 1,284,384 2,128,975 193,541 24,104 11,206,889 Criticized (accrual) 28,915 34,902 63,620 25,343 61,238 91,993 — — 306,011 Criticized (nonaccrual) — — — 42,067 5,868 2,199 — — 50,134 Total CRE 693,541 2,337,933 2,418,618 2,320,640 1,351,490 2,223,167 193,541 24,104 11,563,034 Multifamily residential: Pass 160,470 764,482 762,001 470,223 352,094 488,260 5,889 — 3,003,419 Criticized (accrual) — — 731 22,309 6,067 29,296 — — 58,403 Criticized (nonaccrual) — — — 1,447 1,125 2,121 — — 4,693 Total multifamily residential 160,470 764,482 762,732 493,979 359,286 519,677 5,889 — 3,066,515 Construction and land: Pass 5,642 141,475 146,701 121,364 — 20,691 — — 435,873 Criticized (accrual) 3,481 — — — — — — — 3,481 Criticized (nonaccrual) — — — — — 19,900 — — 19,900 Total construction and land 9,123 141,475 146,701 121,364 — 40,591 — — 459,254 Total CRE 863,134 3,243,890 3,328,051 2,935,983 1,710,776 2,783,435 199,430 24,104 15,088,803 Total commercial 2,579,695 6,434,251 4,650,080 3,372,479 1,972,539 3,073,789 7,033,649 53,431 29,169,913 Consumer: Residential mortgage: Single-family residential: Pass (1) 669,660 2,427,430 1,704,855 1,385,623 956,307 1,360,015 — — 8,503,890 Criticized (accrual) — — — 194 347 2,207 — — 2,748 Criticized (nonaccrual) (1) — — 1,205 1,038 2,246 13,160 — — 17,649 Total single-family residential mortgage 669,660 2,427,430 1,706,060 1,386,855 958,900 1,375,382 — — 8,524,287 HELOCs: Pass — 690 548 3,235 4,319 14,931 1,458,199 255,538 1,737,460 Criticized (accrual) — — — — — 1 287 547 835 Criticized (nonaccrual) — — 151 188 4,019 1,838 449 4,232 10,877 Total HELOCs — 690 699 3,423 8,338 16,770 1,458,935 260,317 1,749,172 Total residential mortgage 669,660 2,428,120 1,706,759 1,390,278 967,238 1,392,152 1,458,935 260,317 10,273,459 Other consumer: Pass 849 8,168 — — 1,830 83,547 48,455 — 142,849 Criticized (nonaccrual) — — — — 2,492 — 35 — 2,527 Total other consumer 849 8,168 — — 4,322 83,547 48,490 — 145,376 Total consumer 670,509 2,436,288 1,706,759 1,390,278 971,560 1,475,699 1,507,425 260,317 10,418,835 Total $ 3,250,204 $ 8,870,539 $ 6,356,839 $ 4,762,757 $ 2,944,099 $ 4,549,488 $ 8,541,074 $ 313,748 $ 39,588,748 ($ in thousands) December 31, 2020 Term Loans Revolving Loans Revolving Loans Converted to Term Loans Amortized Cost Basis Total Amortized Cost Basis by Origination Year 2020 2019 2018 2017 2016 Prior Commercial: C&I: Pass $ 3,912,147 $ 1,477,740 $ 483,725 $ 245,594 $ 69,482 $ 245,615 $ 6,431,003 $ 29,487 $ 12,894,793 Criticized (accrual) 120,183 74,601 56,785 19,426 1,487 5,872 324,640 — 602,994 Criticized (nonaccrual) 2,125 25,267 22,240 18,787 4,964 1,592 58,964 — 133,939 Total C&I 4,034,455 1,577,608 562,750 283,807 75,933 253,079 6,814,607 29,487 13,631,726 CRE: CRE: Pass 2,296,649 2,402,136 2,310,748 1,328,251 732,694 1,529,681 173,267 19,064 10,792,490 Criticized (accrual) 47,459 63,654 43,447 98,259 2,094 80,662 — — 335,575 Criticized (nonaccrual) — — 42,067 1,115 — 3,364 — — 46,546 Total CRE 2,344,108 2,465,790 2,396,262 1,427,625 734,788 1,613,707 173,267 19,064 11,174,611 Multifamily residential: Pass 783,671 783,589 479,959 411,945 181,213 348,751 5,895 — 2,995,023 Criticized (accrual) — 735 22,330 6,101 264 5,877 — — 35,307 Criticized (nonaccrual) — — 1,475 — — 2,193 — — 3,668 Total multifamily residential 783,671 784,324 503,764 418,046 181,477 356,821 5,895 — 3,033,998 Construction and land: Pass 224,924 172,707 156,712 — 20,897 1,028 — — 576,268 Criticized (accrual) 3,524 — — — — 19,900 — — 23,424 Criticized (nonaccrual) — — — — — — — — — Total construction and land 228,448 172,707 156,712 — 20,897 20,928 — — 599,692 Total CRE 3,356,227 3,422,821 3,056,738 1,845,671 937,162 1,991,456 179,162 19,064 14,808,301 Total commercial 7,390,682 5,000,429 3,619,488 2,129,478 1,013,095 2,244,535 6,993,769 48,551 28,440,027 Consumer: Residential mortgage: Single-family residential: Pass (1) 2,385,853 1,813,200 1,501,660 1,021,707 523,170 921,714 — — 8,167,304 Criticized (accrual) — 1,429 — — 119 1,034 — — 2,582 Criticized (nonaccrual) (1) — 226 812 1,789 1,994 11,246 — — 16,067 Total single-family residential mortgage 2,385,853 1,814,855 1,502,472 1,023,496 525,283 933,994 — — 8,185,953 HELOCs: Pass 1,131 880 2,879 5,363 8,433 13,475 1,328,919 225,810 1,586,890 Criticized (accrual) — — 200 — 996 — 1,328 606 3,130 Criticized (nonaccrual) — 151 285 4,617 164 1,962 — 4,517 11,696 Total HELOCs 1,131 1,031 3,364 9,980 9,593 15,437 1,330,247 230,933 1,601,716 Total residential mortgage 2,386,984 1,815,886 1,505,836 1,033,476 534,876 949,431 1,330,247 230,933 9,787,669 Other consumer: Pass 9,531 — — 1,830 — 83,255 66,136 — 160,752 Criticized (accrual) 16 — — — — — — — 16 Criticized (nonaccrual) — — — 2,491 — — — — 2,491 Total other consumer 9,547 — — 4,321 — 83,255 66,136 — 163,259 Total consumer 2,396,531 1,815,886 1,505,836 1,037,797 534,876 1,032,686 1,396,383 230,933 9,950,928 Total $ 9,787,213 $ 6,816,315 $ 5,125,324 $ 3,167,275 $ 1,547,971 $ 3,277,221 $ 8,390,152 $ 279,484 $ 38,390,955 (1) As of March 31, 2021 and December 31, 2020, $647 thousand and $747 thousand of nonaccrual loans whose payments are guaranteed by the Federal Housing Administration were classified with a pass rating.
Schedule of aging analysis of loans	The following table presents the aging analysis of total loans held-for-investment as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 Current Accruing Loans (1) Accruing Accruing Total Total Total Commercial: C&I $ 13,923,524 $ 26,417 $ 5,633 $ 32,050 $ 125,536 $ 14,081,110 CRE: CRE 11,473,405 5,688 33,807 39,495 50,134 11,563,034 Multifamily residential 3,061,822 — — — 4,693 3,066,515 Construction and land 439,354 — — — 19,900 459,254 Total CRE 14,974,581 5,688 33,807 39,495 74,727 15,088,803 Total commercial 28,898,105 32,105 39,440 71,545 200,263 29,169,913 Consumer: Residential mortgage: Single-family residential 8,493,416 9,827 2,748 12,575 18,296 8,524,287 HELOCs 1,735,692 1,769 834 2,603 10,877 1,749,172 Total residential mortgage 10,229,108 11,596 3,582 15,178 29,173 10,273,459 Other consumer 142,604 242 4 246 2,526 145,376 Total consumer 10,371,712 11,838 3,586 15,424 31,699 10,418,835 Total $ 39,269,817 $ 43,943 $ 43,026 $ 86,969 $ 231,962 $ 39,588,748 ($ in thousands) December 31, 2020 Current Accruing Loans (1) Accruing Accruing Total Total Total Commercial: C&I $ 13,488,070 $ 8,993 $ 724 $ 9,717 $ 133,939 $ 13,631,726 CRE: CRE 11,127,690 375 — 375 46,546 11,174,611 Multifamily residential 3,028,512 1,818 — 1,818 3,668 3,033,998 Construction and land 579,792 19,900 — 19,900 — 599,692 Total CRE 14,735,994 22,093 — 22,093 50,214 14,808,301 Total commercial 28,224,064 31,086 724 31,810 184,153 28,440,027 Consumer: Residential mortgage: Single-family residential 8,156,645 9,911 2,583 12,494 16,814 8,185,953 HELOCs 1,583,968 2,922 3,130 6,052 11,696 1,601,716 Total residential mortgage 9,740,613 12,833 5,713 18,546 28,510 9,787,669 Other consumer 160,534 217 17 234 2,491 163,259 Total consumer 9,901,147 13,050 5,730 18,780 31,001 9,950,928 Total $ 38,125,211 $ 44,136 $ 6,454 $ 50,590 $ 215,154 $ 38,390,955 (1) As of March 31, 2021 and December 31, 2020, the “Current Accruing Loans” balance of loans in payment deferral programs offered in response to the COVID-19 pandemic which are performing according to their modified terms are generally not considered delinquent.
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 March 31, 2021 and December 31, 2020. Nonaccrual loans may not have an allowance for credit losses if the loss expectation is zero as the loan balances are supported by the collateral value. ($ in thousands) March 31, 2021 December 31, 2020 Commercial: C&I $ 63,312 $ 62,040 CRE: CRE 49,137 45,537 Multifamily residential 3,578 2,519 Construction and land 19,900 — Total CRE 72,615 48,056 Total commercial 135,927 110,096 Consumer: Residential mortgage: Single-family residential 6,014 6,013 HELOCs 7,353 8,076 Total residential mortgage 13,367 14,089 Other consumer 2,491 2,491 Total consumer 15,858 16,580 Total nonaccrual loans with no related allowance for loan losses $ 151,785 $ 126,676
Summary of additions and post-modification to troubled debt restructurings	The following table presents the additions to TDRs for the three months ended March 31, 2021 and 2020: ($ in thousands) Loans Modified as TDRs During the Three Months Ended March 31, 2021 2020 Number Pre- Post- Modification Outstanding Recorded Investment (1) Financial Impact (2) Number Pre- Post- Modification Outstanding Recorded Investment (1) Financial Impact (2) Commercial: C&I 1 $ 443 $ 433 $ 203 3 $ 16,604 $ 15,735 $ 98 Total 1 $ 443 $ 433 $ 203 3 $ 16,604 $ 15,735 $ 98 (1) Includes subsequent payments after modification and reflects the balance as of March 31, 2021 and 2020. (2) Includes charge-offs and specific reserves recorded since the modification date. The following table presents the TDR post-modification outstanding balances for the three months ended March 31, 2021 and 2020 by modification type: ($ in thousands) Modification Type During the Three Months Ended March 31, 2021 2020 Principal (1) Principal and Interest (2) Total Principal (1) Principal and Interest (2) Total Commercial: C&I $ 433 $ — $ 433 $ 4,564 $ 11,171 $ 15,735 Total $ 433 $ — $ 433 $ 4,564 $ 11,171 $ 15,735 (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 principal and interest deferments or reductions.
Summary of TDR loans subsequently defaulted	The following table presents information on loans for which a subsequent payment default occurred during the three months ended March 31, 2021, which had been modified as TDR within the previous 12 months of its default, and were still in default as of March 31, 2021. In comparison, there were no TDRs that experienced payment default after modifications within the previous 12 months during the three months ended March 31, 2020. ($ in thousands) Loans Modified as TDRs that Subsequently Defaulted 2021 Number of Recorded Commercial: C&I 1 $ 11,538 Total 1 $ 11,538
Summary of activity in the allowance for credit losses	The following tables summarize the activity in the allowance for loan losses by portfolio segments for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 Commercial Consumer Total C&I CRE Residential Mortgage Other CRE Multifamily Construction Single- HELOCs Allowance for loan losses, beginning of period $ 398,040 $ 163,791 $ 27,573 $ 10,239 $ 15,520 $ 2,690 $ 2,130 $ 619,983 Provision for (reversal of) credit losses on loans (a) 3,839 (10,277) (1,391) 8,592 376 22 (113) 1,048 Gross charge-offs (8,436) (7,195) (17) (71) (134) (45) (1) (15,899) Gross recoveries 760 80 1,242 329 77 3 2 2,493 Total net (charge-offs) recoveries (7,676) (7,115) 1,225 258 (57) (42) 1 (13,406) Foreign currency translation adjustment (119) — — — — — — (119) Allowance for loan losses, end of period $ 394,084 $ 146,399 $ 27,407 $ 19,089 $ 15,839 $ 2,670 $ 2,018 $ 607,506 ($ in thousands) Three Months Ended March 31, 2020 Commercial Consumer Total C&I CRE Residential Mortgage Other CRE Multifamily Construction Single- HELOCs Allowance for loan losses, beginning of period $ 238,376 $ 40,509 $ 22,826 $ 19,404 $ 28,527 $ 5,265 $ 3,380 $ 358,287 Impact of ASU 2016-13 adoption 74,237 72,169 (8,112) (9,889) (3,670) (1,798) 2,221 125,158 Provision for (reversal of) credit losses on loans (a) 60,618 11,435 1,281 1,482 1,700 412 (2,272) 74,656 Gross charge-offs (11,977) (954) — — — — (26) (12,957) Gross recoveries 1,575 9,660 535 21 265 2 1 12,059 Total net (charge-offs) recoveries (10,402) 8,706 535 21 265 2 (25) (898) Foreign currency translation adjustment (200) — — — — — — (200) Allowance for loan losses, end of period $ 362,629 $ 132,819 $ 16,530 $ 11,018 $ 26,822 $ 3,881 $ 3,304 $ 557,003 The following table summarizes the activities in the allowance for unfunded credit commitments for the three months ended March 31, 2021 and 2020 : ($ in thousands) Three Months Ended March 31, 2021 2020 Unfunded credit facilities Allowance for unfunded credit commitments, beginning of period $ 33,577 $ 11,158 Impact of ASU 2016-13 adoption — 10,457 Reversal of credit losses on unfunded credit commitments (b) (1,048) (786) Allowance for unfunded credit commitments, end of period 32,529 20,829 Provision for credit losses (a) + (b) $ — $ 73,870
Schedule of carrying value of loans purchased for the held-for-investment portfolio, loans sold and loans transferred from held-for-investment to held-for-sale at lower of cost or fair value	The following tables provide information about the carrying value of loans purchased for the held-for-investment portfolio, loans sold and loans transferred during the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 Commercial Consumer Total C&I CRE Residential Mortgage CRE Multifamily Single-Family Loans transferred from held-for-investment to held-for-sale (1) $ 125,840 $ 20,032 $ — $ — $ 145,872 Sales (2)(3)(4) $ 125,879 $ 20,032 $ — $ 7,506 $ 153,417 Purchases (5) $ 178,678 $ — $ 370 $ 131,800 $ 310,848 ($ in thousands) Three Months Ended March 31, 2020 Commercial Consumer Total C&I CRE Residential Mortgage CRE Multifamily Single-Family Loans transferred from held-for-investment to held-for-sale (1) $ 102,973 $ 7,250 $ — $ — $ 110,223 Sales (2)(3)(4) $ 102,973 $ 7,250 $ — $ 4,642 $ 114,865 Purchases (5) $ 130,583 $ — $ 1,513 $ 1,084 $ 133,180 (1) Includes write-downs of $39 thousand to the allowance for loan losses related to loans transferred from held-for-investment to held-for-sale for the three months ended March 31, 2021. There were no write-downs for the three months ended March 31, 2020. (2) Includes originated loans sold of $131.0 million and $114.9 million for the three months ended March 31, 2021 and 2020, respectively. Originated loans sold consisted primarily of C&I loans for both periods. (3) Includes $22.4 million of purchased loans sold in the secondary market for the three months ended March 31, 2021. There were no purchased loans sold in the secondary market for the three months ended March 31, 2020. (4) Net gains on sales of loans were $1.8 million and $950 thousand for the three months ended March 31, 2021 and 2020, respectively. (5) 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)	3 Months Ended
	Mar. 31, 2021
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities [Abstract]
Schedule of investments in qualified affordable housing partnerships, net and related unfunded commitments	The following table presents the Company’s investments in qualified affordable housing partnerships, net, and related unfunded commitments as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 December 31, 2020 Investments in qualified affordable housing partnerships, net $ 284,862 $ 213,555 Accrued expenses and other liabilities — Unfunded commitments $ 142,103 $ 77,444
Schedule of additional information related to investments in qualified affordable housing partnerships, net	The following table presents additional information related to the Company’s investments in qualified affordable housing partnerships, net, for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 2020 Tax credits and other tax benefits recognized $ 11,028 $ 11,031 Amortization expense included in income tax expense $ 8,712 $ 8,384
Schedule of investment in tax credit and other investments, net and related unfunded commitments	The following table presents the Company’s investments in tax credit and other investments, net, and related unfunded commitments as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 December 31, 2020 Investments in tax credit and other investments, net $ 361,438 $ 266,525 Accrued expenses and other liabilities — Unfunded commitments $ 192,644 $ 105,282

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of gross carrying amount of core deposit intangible assets and accumulated amortization	The following table presents the gross carrying amount of core deposit intangible assets and accumulated amortization as of March 31, 2021 and December 31, 2020: ($ in thousands) March 31, 2021 December 31, 2020 Gross balance (1) $ 86,099 $ 86,099 Accumulated amortization (1) (80,454) (79,722) Net carrying balance (1) $ 5,645 $ 6,377 (1) Excludes fully amortized core deposit intangible assets.
Schedule of estimated future amortization expense of core deposit intangibles	The following table presents the estimated future amortization expense of core deposit intangibles as of March 31, 2021: ($ in thousands) Amount Remainder of 2021 $ 2,017 2022 1,865 2023 1,199 2024 553 2025 11 Total $ 5,645

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Schedule of credit-related commitments	The following table presents the Company’s credit-related commitments as of March 31, 2021 and December 31, 2020: ($ in thousands) March 30, 2021 December 31, 2020 Expire in One Year or Less Expire After One Year Through Three Years Expire After Three Years Through Expire After Five Years Total Total Loan commitments $ 3,090,244 $ 1,943,216 $ 638,815 $ 172,171 $ 5,844,446 $ 5,690,917 Commercial letters of credit and SBLCs 1,263,991 398,670 166,496 513,202 2,342,359 2,240,813 Total $ 4,354,235 $ 2,341,886 $ 805,311 $ 685,373 $ 8,186,805 $ 7,931,730
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 March 31, 2021 and December 31, 2020: ($ in thousands) Maximum Potential Future Payments Carrying Value March 31, 2021 December 31, 2020 March 31, 2021 December 31, 2020 Expire After One Year Through Three Years Expire After Three Years Through Expire After Five Years Total Total Total Total Single-family residential loans sold or securitized with recourse $ 392 $ 369 $ 9,525 $ 10,286 $ 10,526 $ 10,286 $ 10,526 Multi-family residential loans sold or securitized with recourse 195 — 14,995 15,190 15,672 25,117 26,619 Total $ 587 $ 369 $ 24,520 $ 25,476 $ 26,198 $ 35,403 $ 37,145

Stock Compensation Plans (Table

Stock Compensation Plans (Tables)	3 Months Ended
	Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Summary of stock compensation expense and related net tax benefit	The following table presents a summary of the total share-based compensation expense and the related net tax benefits (deficiencies) associated with the Company’s various employee share-based compensation plans for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 2020 Stock compensation costs $ 7,817 $ 7,209 Related net tax benefits (deficiencies) for stock compensation plans $ 1,620 $ (1,566)
Summary of activity for time-based and performance-based restricted stock units	The following table presents a summary of the activities for the Company’s time-based and performance-based RSUs that will be settled in shares for the three months ended March 31, 2021. 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 Shares Weighted-Average Outstanding, January 1, 2021 1,345,635 $ 50.22 398,057 $ 53.66 Granted 374,875 71.40 91,960 77.67 Vested (275,503) 67.30 (120,286) 70.13 Forfeited (26,369) 60.94 — — Outstanding, March 31, 2021 1,418,638 $ 52.30 369,731 $ 54.28
Summary of time-based RUS's that will be settled in cash	The following table presents a summary of the activities for the Company’s time-based RSUs that will be vested in cash for the three months ended March 31, 2021: Shares Outstanding, January 1, 2021 21,802 Granted 15,803 Vested — Forfeited (4,075) Outstanding, March 31, 2021 33,530

Stockholders' Equity and Earn_2

Stockholders' Equity and Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2021
Stockholders' Equity and Earnings Per Share [Abstract]
Schedule of earnings per share calculations	The following table presents the basic and diluted EPS calculations for the three months ended March 31, 2021 and 2020. For more information on the calculation of EPS, see Note 1 — Summary of Significant Accounting Policies — Significant Accounting Policies — Earnings Per Share to the Consolidated Financial Statements of the Company’s 2020 Form 10-K. ($ and shares in thousands, except per share data) Three Months Ended March 31, 2021 2020 Basic: Net income $ 204,994 $ 144,824 Basic weighted-average number of shares outstanding 141,646 144,814 Basic EPS $ 1.45 $ 1.00 Diluted: Net income $ 204,994 $ 144,824 Basic weighted-average number of shares outstanding 141,646 144,814 Diluted potential common shares (1) 1,198 471 Diluted weighted-average number of shares outstanding (1) 142,844 145,285 Diluted EPS $ 1.44 $ 1.00 (1) Includes dilutive shares from RSUs for the three months ended March 31, 2021 and 2020.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2021
Equity [Abstract]
Schedule of the changes in components of accumulated other comprehensive income (loss) balances	The following table presents the changes in the components of AOCI balances for the three months ended March 31, 2021 and 2020: ($ in thousands) AFS Cash Foreign Currency Translation Adjustments (1) Total Balance, January 1, 2020 $ (2,419) $ — $ (15,989) $ (18,408) Net unrealized gains (losses) arising during the period 28,530 — (2,164) 26,366 Amounts reclassified from AOCI (1,077) — — (1,077) Changes, net of tax 27,453 — (2,164) 25,289 Balance, March 31, 2020 $ 25,034 $ — $ (18,153) $ 6,881 Balance, January 1, 2021 $ 52,247 $ (1,230) $ (6,692) $ 44,325 Net unrealized (losses) gains arising during the period (133,313) 305 (1,349) (134,357) Amounts reclassified from AOCI (135) 127 — (8) Changes, net of tax (133,448) 432 (1,349) (134,365) Balance, March 31, 2021 $ (81,201) $ (798) $ (8,041) $ (90,040) (1) Represents foreign currency translation adjustments related to the Company’s net investment in non-U.S. operations, including related hedges. The functional currency and reporting currency of the Company’s foreign subsidiary was RMB and USD, respectively.
Schedule of components of other comprehensive income (loss), reclassifications to net income and the related tax effects	The following table presents the components of other comprehensive income (loss), reclassifications to net income and the related tax effects for the three months ended March 31, 2021 and 2020: ($ in thousands) Three Months Ended March 31, 2021 2020 Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax AFS debt securities: Net unrealized (losses) gains arising during the period $ (189,276) $ 55,963 $ (133,313) $ 40,493 $ (11,963) $ 28,530 Net realized (gains) reclassified into net income (1) (192) 57 (135) (1,529) 452 (1,077) Net change (189,468) 56,020 (133,448) 38,964 (11,511) 27,453 Cash flow hedges: Net unrealized gains arising during the period 426 (121) 305 — — — Net realized losses reclassified into net income (2) 177 (50) 127 — — — Net change 603 (171) 432 — — — Foreign currency translation adjustments, net of hedges: Net unrealized losses arising during the period (1,309) (40) (1,349) (1,766) (398) (2,164) Net change (1,309) (40) (1,349) (1,766) (398) (2,164) Other comprehensive (loss) income $ (190,174) $ 55,809 $ (134,365) $ 37,198 $ (11,909) $ 25,289 (1) For the three months ended March 31, 2021 and 2020, pre-tax amounts were reported in Gains on sales of AFS debt securities on the Consolidated Statement of Income. (2) For the three months ended March 31, 2021 and 2020, pre-tax amounts were reported in Interest expense on the Consolidated Statement of Income.

Business Segments (Tables)

Business Segments (Tables)	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Schedule of operating results and other key financial measures for the individual operating segments	The following tables present the operating results and other key financial measures for the individual operating segments as of and for the three months ended March 31, 2021 and 2020: ($ in thousands) Consumer and Commercial Other Total Three Months Ended March 31, 2021 Net interest income before (reversal of) provision for credit losses $ 149,899 $ 177,092 $ 26,704 $ 353,695 (Reversal of) provision for credit losses (4,249) 4,249 — — Noninterest income 20,828 50,010 2,028 72,866 Noninterest expense 89,286 69,257 32,534 191,077 Segment income (loss) before income taxes 85,690 153,596 (3,802) 235,484 Segment net income $ 61,378 $ 110,080 $ 33,536 $ 204,994 As of March 31, 2021 Segment assets $ 14,147,094 $ 27,222,272 $ 15,504,780 $ 56,874,146 ($ in thousands) Consumer and Commercial Other Total Three Months Ended March 31, 2020 Net interest income before provision for credit losses $ 152,591 $ 183,501 $ 26,615 $ 362,707 Provision for credit losses 7,788 66,082 — 73,870 Noninterest income 16,402 32,456 6,648 55,506 Noninterest expense 86,964 70,126 23,243 180,333 Segment income before income taxes 74,241 79,749 10,020 164,010 Segment net income $ 53,195 $ 57,131 $ 34,498 $ 144,824 As of March 31, 2020 Segment assets $ 11,894,691 $ 26,412,726 $ 7,641,128 $ 45,948,545

Basis of Presentation (Details)

Basis of Presentation (Details)	Mar. 31, 2021trust
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of wholly-owned subsidiaries that are statutory business trusts (the Trusts)	6

Fair Value Measurement and Fa_3

Fair Value Measurement and Fair Value of Financial Instruments (Financial Assets and Liabilities Measurement on Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale debt securities
Fair Value	$ 7,789,213	$ 5,544,658
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]
Total investments in tax credit and other investments	361,438	266,525
Derivative
Derivative assets - Fair value	457,317	602,754
Net derivative assets	349,082	501,242
Derivative liabilities - Fair value	344,135	424,828
Net derivative liabilities	157,448	240,131
U.S. Treasury securities
Available-for-sale debt securities
Fair Value	826,342	50,761
U.S. government agency and U.S. government-sponsored enterprise debt securities
Available-for-sale debt securities
Fair Value	1,194,005	814,319
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Available-for-sale debt securities
Fair Value	1,169,391	1,153,770
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Available-for-sale debt securities
Fair Value	2,247,406	1,660,894
Municipal securities
Available-for-sale debt securities
Fair Value	420,065	396,073
Non-agency commercial mortgage-backed securities
Available-for-sale debt securities
Fair Value	281,027	239,842
Non-agency residential mortgage-backed securities
Available-for-sale debt securities
Fair Value	523,500	289,775
Corporate debt securities
Available-for-sale debt securities
Fair Value	496,643	405,968
Foreign government bonds
Available-for-sale debt securities
Fair Value	276,328	182,531
Asset-backed securities
Available-for-sale debt securities
Fair Value	63,040	63,231
Collateralized loan obligations (“CLOs”)
Available-for-sale debt securities
Fair Value	291,466	287,494
Fair Value, Measurements, Recurring
Available-for-sale debt securities
Fair Value	7,789,213	5,544,658
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]
Equity securities	26,693	31,272
Total investments in tax credit and other investments	26,693	31,272
Derivative
Derivative assets - Fair value	457,317	602,754
Netting adjustments	(108,235)	(101,512)
Net derivative assets	349,082	501,242
Derivative liabilities - Fair value	344,135	424,828
Netting adjustments	(186,687)	(184,697)
Net derivative liabilities	157,448	240,131
Fair Value, Measurements, Recurring | Interest rate contracts
Derivative
Derivative assets - Fair value	319,049	489,132
Derivative liabilities - Fair value	230,290	317,698
Fair Value, Measurements, Recurring | Foreign exchange contracts
Derivative
Derivative assets - Fair value	39,562	30,300
Derivative liabilities - Fair value	27,287	22,759
Fair Value, Measurements, Recurring | Credit contracts
Derivative
Derivative assets - Fair value	5	13
Derivative liabilities - Fair value	153	206
Fair Value, Measurements, Recurring | Equity contracts
Derivative
Derivative assets - Fair value	272	858
Fair Value, Measurements, Recurring | Commodity contracts
Derivative
Derivative assets - Fair value	98,429	82,451
Derivative liabilities - Fair value	86,405	84,165
Fair Value, Measurements, Recurring | U.S. Treasury securities
Available-for-sale debt securities
Fair Value	826,342	50,761
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise debt securities
Available-for-sale debt securities
Fair Value	1,194,005	814,319
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Available-for-sale debt securities
Fair Value	1,169,391	1,153,770
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Available-for-sale debt securities
Fair Value	2,247,406	1,660,894
Fair Value, Measurements, Recurring | Municipal securities
Available-for-sale debt securities
Fair Value	420,065	396,073
Fair Value, Measurements, Recurring | Non-agency commercial mortgage-backed securities
Available-for-sale debt securities
Fair Value	281,027	239,842
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities
Available-for-sale debt securities
Fair Value	523,500	289,775
Fair Value, Measurements, Recurring | Corporate debt securities
Available-for-sale debt securities
Fair Value	496,643	405,968
Fair Value, Measurements, Recurring | Foreign government bonds
Available-for-sale debt securities
Fair Value	276,328	182,531
Fair Value, Measurements, Recurring | Asset-backed securities
Available-for-sale debt securities
Fair Value	63,040	63,231
Fair Value, Measurements, Recurring | Collateralized loan obligations (“CLOs”)
Available-for-sale debt securities
Fair Value	291,466	287,494
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Available-for-sale debt securities
Fair Value	826,342	50,761
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]
Equity securities	22,233	22,548
Total investments in tax credit and other investments	22,233	22,548
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 | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign exchange contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Credit contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity contracts
Derivative
Derivative assets - Fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities
Available-for-sale debt securities
Fair Value	826,342	50,761
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government agency and U.S. government-sponsored enterprise debt securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-agency commercial mortgage-backed securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-agency residential mortgage-backed securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign government bonds
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized loan obligations (“CLOs”)
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Available-for-sale debt securities
Fair Value	6,962,871	5,493,897
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]
Equity securities	4,460	8,724
Total investments in tax credit and other investments	4,460	8,724
Derivative
Derivative assets - Fair value	457,045	602,481
Netting adjustments	(108,235)	(101,512)
Net derivative assets	348,810	500,969
Derivative liabilities - Fair value	344,135	424,828
Netting adjustments	(186,687)	(184,697)
Net derivative liabilities	157,448	240,131
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate contracts
Derivative
Derivative assets - Fair value	319,049	489,132
Derivative liabilities - Fair value	230,290	317,698
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts
Derivative
Derivative assets - Fair value	39,562	30,300
Derivative liabilities - Fair value	27,287	22,759
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Credit contracts
Derivative
Derivative assets - Fair value	5	13
Derivative liabilities - Fair value	153	206
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity contracts
Derivative
Derivative assets - Fair value	0	585
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commodity contracts
Derivative
Derivative assets - Fair value	98,429	82,451
Derivative liabilities - Fair value	86,405	84,165
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government-sponsored enterprise debt securities
Available-for-sale debt securities
Fair Value	1,194,005	814,319
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Available-for-sale debt securities
Fair Value	1,169,391	1,153,770
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Available-for-sale debt securities
Fair Value	2,247,406	1,660,894
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities
Available-for-sale debt securities
Fair Value	420,065	396,073
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency commercial mortgage-backed securities
Available-for-sale debt securities
Fair Value	281,027	239,842
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency residential mortgage-backed securities
Available-for-sale debt securities
Fair Value	523,500	289,775
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities
Available-for-sale debt securities
Fair Value	496,643	405,968
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign government bonds
Available-for-sale debt securities
Fair Value	276,328	182,531
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities
Available-for-sale debt securities
Fair Value	63,040	63,231
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Collateralized loan obligations (“CLOs”)
Available-for-sale debt securities
Fair Value	291,466	287,494
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Available-for-sale debt securities
Fair Value	0	0
Equity Securities, FV-NI and with Readily Determinable Fair Value [Abstract]
Equity securities	0	0
Total investments in tax credit and other investments	0	0
Derivative
Derivative assets - Fair value	272	273
Netting adjustments	0	0
Net derivative assets	272	273
Derivative liabilities - Fair value	0	0
Netting adjustments	0	0
Net derivative liabilities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign exchange contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Credit contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity contracts
Derivative
Derivative assets - Fair value	272	273
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commodity contracts
Derivative
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. government agency and U.S. government-sponsored enterprise debt securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Municipal securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Non-agency commercial mortgage-backed securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Non-agency residential mortgage-backed securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign government bonds
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Asset-backed securities
Available-for-sale debt securities
Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Collateralized loan obligations (“CLOs”)
Available-for-sale debt securities
Fair Value	$ 0	$ 0

Fair Value Measurement and Fa_4

Fair Value Measurement and Fair Value of Financial Instruments (Reconciliation of Assets and Liabilities Measured on Recurring Basis) (Details) - Equity contracts - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Lending fees
Reconciliation of the beginning and ending balances for warrants issued by private companies measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Total unrealized (losses) gains for the period included in earnings	$ (1)	$ 292
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Reconciliation of the beginning and ending balances for warrants issued by private companies measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Beginning balance	273	421
Total (losses) gains included in earnings	(1)	292
Ending balance	$ 272	$ 713

Fair Value Measurement and Fa_5

Fair Value Measurement and Fair Value of Financial Instruments (Quantitative Information for Significant Unobservable Inputs) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Quantitative information
Derivative assets - Fair value	$ 457,317	$ 602,754
Fair Value, Measurements, Recurring
Quantitative information
Derivative assets - Fair value	457,317	602,754
Fair Value, Measurements, Nonrecurring
Quantitative information
Loans held-for-investment, fair value disclosure	202,583	189,862
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Quantitative information
Derivative assets - Fair value	272	273
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Quantitative information
Loans held-for-investment, fair value disclosure	202,583	189,862
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring
Quantitative information
Loans held-for-investment, fair value disclosure	108,918	104,783
Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring
Quantitative information
Loans held-for-investment, fair value disclosure	24,356	22,207
Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring
Quantitative information
Loans held-for-investment, fair value disclosure	59,407	46,993
Significant Unobservable Inputs (Level 3) | Fair value of collateral, contract value | Fair Value, Measurements, Nonrecurring
Quantitative information
Loans held-for-investment, fair value disclosure	9,902	15,879
OREO | Fair Value, Measurements, Nonrecurring
Quantitative information
Assets, fair value disclosure		15,824
OREO | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Quantitative information
Assets, fair value disclosure		15,824
OREO | Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring
Quantitative information
Assets, fair value disclosure		15,824
Investments in tax credit and other investments, net | Fair Value, Measurements, Nonrecurring
Quantitative information
Assets, fair value disclosure		3,140
Investments in tax credit and other investments, net | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Quantitative information
Assets, fair value disclosure		3,140
Investments in tax credit and other investments, net | Significant Unobservable Inputs (Level 3) | Individual analysis of each investment, expected future tax benefits and distributions | Fair Value, Measurements, Nonrecurring
Quantitative information
Assets, fair value disclosure		3,140
Equity contracts | Fair Value, Measurements, Recurring
Quantitative information
Derivative assets - Fair value	272	858
Equity contracts | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Quantitative information
Derivative assets - Fair value	$ 272	$ 273
Equity volatility | Equity contracts | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model | Fair Value, Measurements, Recurring | Weighted Average
Quantitative information
Measurement input	52.00%	53.00%
Equity volatility | Equity contracts | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model | Fair Value, Measurements, Recurring | Minimum
Quantitative information
Measurement input	48.00%	46.00%
Equity volatility | Equity contracts | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model | Fair Value, Measurements, Recurring | Maximum
Quantitative information
Measurement input	56.00%	61.00%
Liquidity discount | Equity contracts | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Quantitative information
Measurement input	47.00%	47.00%
Liquidity discount | Equity contracts | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Weighted Average
Quantitative information
Measurement input	47.00%	47.00%
Discount | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Weighted Average
Quantitative information
Loans held-for-investment, measurement input	11.00%	11.00%
Discount | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Minimum
Quantitative information
Loans held-for-investment, measurement input	4.00%	3.00%
Discount | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Maximum
Quantitative information
Loans held-for-investment, measurement input	15.00%	15.00%
Discount | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring | Weighted Average
Quantitative information
Loans held-for-investment, measurement input	15.00%	15.00%
Discount | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring | Minimum
Quantitative information
Loans held-for-investment, measurement input	10.00%	10.00%
Discount | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring | Maximum
Quantitative information
Loans held-for-investment, measurement input	20.00%	26.00%
Selling cost | Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring
Quantitative information
OREO, measurement input		0.08
Selling cost | Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring | Weighted Average
Quantitative information
Loans held-for-investment, measurement input	9.00%	10.00%
OREO, measurement input		0.08
Selling cost | Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring | Minimum
Quantitative information
Loans held-for-investment, measurement input	8.00%	7.00%
Selling cost | Significant Unobservable Inputs (Level 3) | Fair value of property, selling cost | Fair Value, Measurements, Nonrecurring | Maximum
Quantitative information
Loans held-for-investment, measurement input	26.00%	26.00%

Fair Value Measurement and Fa_6

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	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	$ 202,583	$ 189,862
Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	197,792	186,225
Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	4,791	3,637
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0	0
Significant Other Observable Inputs (Level 2) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0	0
Significant Other Observable Inputs (Level 2) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	202,583	189,862
Significant Unobservable Inputs (Level 3) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	197,792	186,225
Significant Unobservable Inputs (Level 3) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	4,791	3,637
Investments in tax credit and other investments, net
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		3,140
Investments in tax credit and other investments, net | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		0
Investments in tax credit and other investments, net | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		0
Investments in tax credit and other investments, net | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		3,140
OREO
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		15,824
OREO | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		0
OREO | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		0
OREO | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		15,824
Commercial and industrial (“C&I”) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	143,630	143,331
Commercial and industrial (“C&I”) | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0	0
Commercial and industrial (“C&I”) | Significant Other Observable Inputs (Level 2) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0	0
Commercial and industrial (“C&I”) | Significant Unobservable Inputs (Level 3) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	143,630	143,331
Commercial real estate (“CRE”) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	47,639	42,894
Commercial real estate (“CRE”) | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0	0
Commercial real estate (“CRE”) | Significant Other Observable Inputs (Level 2) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0	0
Commercial real estate (“CRE”) | Significant Unobservable Inputs (Level 3) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	47,639	42,894
Multifamily residential | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	2,332
Multifamily residential | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0
Multifamily residential | Significant Other Observable Inputs (Level 2) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0
Multifamily residential | Significant Unobservable Inputs (Level 3) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	2,332
Construction and land | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	4,191
Construction and land | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0
Construction and land | Significant Other Observable Inputs (Level 2) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0
Construction and land | Significant Unobservable Inputs (Level 3) | Commercial lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	4,191
HELOCs | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	4,791	1,146
HELOCs | Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0	0
HELOCs | Significant Other Observable Inputs (Level 2) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	0	0
HELOCs | Significant Unobservable Inputs (Level 3) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure	$ 4,791	1,146
Other consumer | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure		2,491
Other consumer | Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure		0
Other consumer | Significant Other Observable Inputs (Level 2) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure		0
Other consumer | Significant Unobservable Inputs (Level 3) | Consumer lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, fair value disclosure		$ 2,491

Fair Value Measurement and Fa_7

Fair Value Measurement and Fair Value of Financial Instruments (Increase (Decrease) in Fair Value of Assets Measured on a Nonrecurring Basis) (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	$ (12,495)	$ (19,208)
Investments in tax credit and other investments, net
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	0	150
Other nonperforming assets
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(3,890)	(300)
Commercial lending | Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(12,458)	(21,506)
Commercial lending | Commercial and industrial (“C&I”) | Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(5,309)	(21,501)
Commercial lending | Commercial real estate (“CRE”) | Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(7,062)	(5)
Commercial lending | Multifamily residential | Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(16)	0
Commercial lending | Construction and land | Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(71)	0
Consumer lending | Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(37)	2,298
Consumer lending | HELOCs | Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	(37)	(193)
Consumer lending | Other consumer | Loans held-for-investment
Fair Value, Assets Measured on a Nonrecurring Basis
Increase (decrease) in value of assets	$ 0	$ 2,491

Fair Value Measurement and Fa_8

Fair Value Measurement and Fair Value of Financial Instruments (Carrying and Fair Value Estimates per the Fair Value Hierarchy of Financial Instruments Measured on a Nonrecurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial assets:
Cash and cash equivalents	$ 4,619,133	$ 4,017,971
Interest-bearing deposits with banks	741,923	809,728
Resale agreements	2,160,038	1,460,000
Restricted equity securities, at cost	83,250	83,046
Loans held-for-investment, net	38,981,242	37,770,972
Financial liabilities:
FHLB advances	653,035	652,612
Repurchase agreements	300,000	300,000
Carrying Amount
Financial assets:
Cash and cash equivalents	4,619,133	4,017,971
Interest-bearing deposits with banks	741,923	809,728
Resale agreements	2,160,038	1,460,000
Restricted equity securities, at cost	83,250	83,046
Loans held-for-sale		1,788
Loans held-for-investment, net	38,981,242	37,770,972
Mortgage servicing rights	5,506	5,522
Accrued interest receivable	149,953	150,140
Financial liabilities:
Demand, checking, savings and money market deposits	40,748,303	35,862,403
Time deposits	8,798,833	9,000,349
Short-term borrowings		21,009
FHLB advances	653,035	652,612
Repurchase agreements	300,000	300,000
Long-term debt	147,445	147,376
Accrued interest payable	9,966	11,956
Estimated Fair Value
Financial assets:
Cash and cash equivalents	4,619,133	4,017,971
Interest-bearing deposits with banks	741,923	809,728
Resale agreements	2,152,392	1,464,635
Restricted equity securities, at cost	83,250	83,046
Loans held-for-sale		1,788
Loans held-for-investment, net	38,922,550	37,803,940
Mortgage servicing rights	8,740	8,435
Accrued interest receivable	149,953	150,140
Financial liabilities:
Demand, checking, savings and money market deposits	40,748,303	35,862,403
Time deposits	8,811,048	9,016,884
Short-term borrowings		21,009
FHLB advances	657,460	659,631
Repurchase agreements	316,099	317,850
Long-term debt	151,015	150,131
Accrued interest payable	9,966	11,956
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	4,619,133	4,017,971
Interest-bearing deposits with banks	0	0
Resale agreements	0	0
Restricted equity securities, at cost	0	0
Loans held-for-sale		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
FHLB advances	0	0
Repurchase agreements	0	0
Long-term debt	0	0
Accrued interest payable	0	0
Estimated Fair Value | Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and cash equivalents	0	0
Interest-bearing deposits with banks	741,923	809,728
Resale agreements	2,152,392	1,464,635
Restricted equity securities, at cost	83,250	83,046
Loans held-for-sale		1,788
Loans held-for-investment, net	0	0
Mortgage servicing rights	0	0
Accrued interest receivable	149,953	150,140
Financial liabilities:
Demand, checking, savings and money market deposits	40,748,303	35,862,403
Time deposits	8,811,048	9,016,884
Short-term borrowings		21,009
FHLB advances	657,460	659,631
Repurchase agreements	316,099	317,850
Long-term debt	151,015	150,131
Accrued interest payable	9,966	11,956
Estimated Fair Value | Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	0	0
Interest-bearing deposits with banks	0	0
Resale agreements	0	0
Restricted equity securities, at cost	0	0
Loans held-for-sale		0
Loans held-for-investment, net	38,922,550	37,803,940
Mortgage servicing rights	8,740	8,435
Accrued interest receivable	0	0
Financial liabilities:
Demand, checking, savings and money market deposits	0	0
Time deposits	0	0
Short-term borrowings		0
FHLB advances	0	0
Repurchase agreements	0	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 and Repurchase Agreements) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Resale agreements
Gross resale agreements	$ 1,310,000		$ 1,160,000
Loans purchased under agreements to resell, increase	850,000		300,000
Repurchase agreements
Gross repurchase agreements	$ 300,000		$ 300,000
Weighted average interest rates	2.67%	4.10%
Securities Purchased Under Resale Agreements
Resale agreements
Weighted-average yields	1.57%	2.50%
Loans Purchased Under Resale Agreements
Resale agreements
Weighted-average yields	2.02%

Assets Purchased under Resale_4

Assets Purchased under Resale Agreements and Sold under Repurchase Agreements (Balance Sheet Offsetting) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets, Resale Agreements
Gross Amounts of Recognized Assets	$ 2,160,038	$ 1,460,000
Gross Amounts Offset on the Consolidated Balance Sheet	0	0
Assets Purchased under Agreements to Resell Gross Amounts Not Offset [Abstract]
Collateral Received	(2,138,721)	(1,458,700)
Net Amount	21,317	1,300
Liabilities, Repurchase Agreements
Gross Amounts of Recognized Liabilities	300,000	300,000
Gross Amounts Offset on the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented on the Consolidated Balance Sheet	300,000	300,000
Assets Sold under Agreements to Repurchase Gross Amounts Not Offset [Abstract]
Collateral Pledged	(300,000)	(300,000)
Net Amount	0	0
Assets purchased under resale agreements (“resale agreements”)	$ 2,160,038	$ 1,460,000

Securities (Schedule of Availab

Securities (Schedule of Available-for-sale Debt Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Debt Securities
Amortized Cost	$ 7,904,546	$ 5,470,523
Gross Unrealized Gains	57,453	96,596
Gross Unrealized Losses	(172,786)	(22,461)
Fair Value	7,789,213	5,544,658
U.S. Treasury securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	841,711	50,310
Gross Unrealized Gains	328	451
Gross Unrealized Losses	(15,697)	0
Fair Value	826,342	50,761
U.S. government agency and U.S. government-sponsored enterprise debt securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	1,236,446	806,814
Gross Unrealized Gains	5,145	8,765
Gross Unrealized Losses	(47,586)	(1,260)
Fair Value	1,194,005	814,319
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	1,178,238	1,125,174
Gross Unrealized Gains	16,407	34,306
Gross Unrealized Losses	(25,254)	(5,710)
Fair Value	1,169,391	1,153,770
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	2,271,645	1,634,553
Gross Unrealized Gains	17,026	27,952
Gross Unrealized Losses	(41,265)	(1,611)
Fair Value	2,247,406	1,660,894
Municipal securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	417,676	382,573
Gross Unrealized Gains	7,348	13,588
Gross Unrealized Losses	(4,959)	(88)
Fair Value	420,065	396,073
Non-agency commercial mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	281,099	234,965
Gross Unrealized Gains	4,311	6,107
Gross Unrealized Losses	(4,383)	(1,230)
Fair Value	281,027	239,842
Non-agency residential mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	525,560	288,520
Gross Unrealized Gains	1,599	1,761
Gross Unrealized Losses	(3,659)	(506)
Fair Value	523,500	289,775
Corporate debt securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	517,309	406,323
Gross Unrealized Gains	4,677	3,493
Gross Unrealized Losses	(25,343)	(3,848)
Fair Value	496,643	405,968
Foreign government bonds
Schedule of Available-for-sale Debt Securities
Amortized Cost	278,100	183,828
Gross Unrealized Gains	320	163
Gross Unrealized Losses	(2,092)	(1,460)
Fair Value	276,328	182,531
Asset-backed securities
Schedule of Available-for-sale Debt Securities
Amortized Cost	62,762	63,463
Gross Unrealized Gains	292	10
Gross Unrealized Losses	(14)	(242)
Fair Value	63,040	63,231
Collateralized loan obligations (“CLOs”)
Schedule of Available-for-sale Debt Securities
Amortized Cost	294,000	294,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,534)	(6,506)
Fair Value	$ 291,466	$ 287,494

Securities (Continuous Unrealiz

Securities (Continuous Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	$ 5,031,239	$ 1,519,603
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(170,164)	(15,456)
Available-for-sale debt securities, 12 Months or More, Fair Value	320,850	342,859
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(2,622)	(7,005)
Available-for-sale debt securities fair value, Total	5,352,089	1,862,462
Available-for-sale debt securities, Gross Unrealized Loss, Total	(172,786)	(22,461)
U.S. Treasury securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	775,801	352,521
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(15,697)	(1,260)
Available-for-sale debt securities, 12 Months or More, Fair Value	0	0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	0	0
Available-for-sale debt securities fair value, Total	775,801	352,521
Available-for-sale debt securities, Gross Unrealized Loss, Total	(15,697)	(1,260)
U.S. government agency and U.S. government-sponsored enterprise debt securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	954,894
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(47,586)
Available-for-sale debt securities, 12 Months or More, Fair Value	0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	0
Available-for-sale debt securities fair value, Total	954,894
Available-for-sale debt securities, Gross Unrealized Loss, Total	(47,586)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	615,193	292,596
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(25,203)	(5,656)
Available-for-sale debt securities, 12 Months or More, Fair Value	3,474	3,543
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(51)	(54)
Available-for-sale debt securities fair value, Total	618,667	296,139
Available-for-sale debt securities, Gross Unrealized Loss, Total	(25,254)	(5,710)
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	1,464,574	342,561
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(41,264)	(1,611)
Available-for-sale debt securities, 12 Months or More, Fair Value	358	0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(1)	0
Available-for-sale debt securities fair value, Total	1,464,932	342,561
Available-for-sale debt securities, Gross Unrealized Loss, Total	(41,265)	(1,611)
Municipal securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	199,225	24,529
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(4,959)	(88)
Available-for-sale debt securities, 12 Months or More, Fair Value	0	0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	0	0
Available-for-sale debt securities fair value, Total	199,225	24,529
Available-for-sale debt securities, Gross Unrealized Loss, Total	(4,959)	(88)
Non-agency commercial mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	114,971	58,738
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(4,374)	(1,230)
Available-for-sale debt securities, 12 Months or More, Fair Value	15,578	7,920
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(9)	0
Available-for-sale debt securities fair value, Total	130,549	66,658
Available-for-sale debt securities, Gross Unrealized Loss, Total	(4,383)	(1,230)
Non-agency residential mortgage-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	391,444	90,156
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(3,659)	(506)
Available-for-sale debt securities, 12 Months or More, Fair Value	0	0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	0	0
Available-for-sale debt securities fair value, Total	391,444	90,156
Available-for-sale debt securities, Gross Unrealized Loss, Total	(3,659)	(506)
Corporate debt securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	347,934	251,674
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(25,316)	(3,645)
Available-for-sale debt securities, 12 Months or More, Fair Value	9,974	9,798
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(27)	(203)
Available-for-sale debt securities fair value, Total	357,908	261,472
Available-for-sale debt securities, Gross Unrealized Loss, Total	(25,343)	(3,848)
Foreign government bonds
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	155,299	106,828
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(2,092)	(1,460)
Available-for-sale debt securities, 12 Months or More, Fair Value	0	0
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	0	0
Available-for-sale debt securities fair value, Total	155,299	106,828
Available-for-sale debt securities, Gross Unrealized Loss, Total	(2,092)	(1,460)
Asset-backed securities
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	11,904	0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	(14)	0
Available-for-sale debt securities, 12 Months or More, Fair Value	0	34,104
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	0	(242)
Available-for-sale debt securities fair value, Total	11,904	34,104
Available-for-sale debt securities, Gross Unrealized Loss, Total	(14)	(242)
Collateralized loan obligations (“CLOs”)
Schedule of Available-for-sale Debt Securities
Available-for-sale debt securities, Less than 12 Months, Fair Value	0	0
Available-for-sale debt securities, Gross Unrealized Loss, Less than 12 Months	0	0
Available-for-sale debt securities, 12 Months or More, Fair Value	291,466	287,494
Available-for-sale debt securities, Gross Unrealized Loss, 12 Months or More	(2,534)	(6,506)
Available-for-sale debt securities fair value, Total	291,466	287,494
Available-for-sale debt securities, Gross Unrealized Loss, Total	$ (2,534)	$ (6,506)

Securities (Narrative) (Details

Securities (Narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2021USD ($)security	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)security
Unrealized Loss
Number of available-for-sale debt securities in an unrealized loss position | security	291		104
Available-for-sale debt securities, in gross unrealized loss position	$ 0		$ 0
Available-for-sale, allowance for credit loss	0		$ 0
Provision for credit losses	0	$ 73,870,000
AFS debt securities
Unrealized Loss
Provision for credit losses	$ 0	$ 0
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities
Unrealized Loss
Number of available-for-sale debt securities in an unrealized loss position | security	112		46
U.S. government-sponsored enterprises debt securities
Unrealized Loss
Number of available-for-sale debt securities in an unrealized loss position | security	41
Corporate debt securities
Unrealized Loss
Number of available-for-sale debt securities in an unrealized loss position | security	26		17
AFS debt securities
Unrealized Loss
AFS debt securities, accrued interest	$ 22,900,000		$ 22,300,000

Securities (Proceeds, Gross Rea

Securities (Proceeds, Gross Realized Gains and Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 192	$ 1,529
Related tax expense	$ 57	$ 452

Securities (Scheduled Contractu

Securities (Scheduled Contractual Maturities of AFS Debt Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost
Due within one year	$ 1,403,404
Due after one year through five years	688,387
Due after five years through ten years	1,427,893
Due after ten years	4,384,862
Amortized Cost	7,904,546	$ 5,470,523
Fair Value
Due within one year	1,347,808
Due after one year through five years	681,602
Due after five years through ten years	1,414,362
Due after ten years	4,345,441
Total available-for-sale debt investment securities	7,789,213	5,544,658
Available for sale debt investment securities pledged as collateral, fair value	$ 590,858	$ 588,484

Securities (Restricted Equity S

Securities (Restricted Equity Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Federal Reserve Bank of San Francisco (“FRBSF”) stock	$ 59,453	$ 59,249
FHLB stock	23,797	23,797
Total restricted equity securities	$ 83,250	$ 83,046

Derivatives (Notional and Fair

Derivatives (Notional and Fair Values) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021USD ($)MMBTUBoecompany	Dec. 31, 2020USD ($)BoeMMBTUcompany
Derivative Asset [Abstract]
Derivative assets - Fair value	$ 457,317	$ 602,754
Less: Master netting agreements	(100,454)	(93,063)
Less: Cash collateral received/paid	(7,781)	(8,449)
Net derivative assets	349,082	501,242
Derivative Liability [Abstract]
Derivative liabilities - Fair value	344,135	424,828
Less: Master netting agreements	(100,454)	(93,063)
Less: Cash collateral received/paid	(86,233)	(91,634)
Net derivative liabilities	$ 157,448	$ 240,131
Crude oil | Customer Counterparty
Derivative Liability [Abstract]
Derivative, nonmonetary notional amount, energy measure | Boe	8,258	6,321
Natural gas | Customer Counterparty
Derivative Liability [Abstract]
Derivative, nonmonetary notional amount, energy measure | MMBTU	102,996	109,635
Derivative instruments designated as hedging instruments
Derivative Instruments
Notional Amount	$ 358,936	$ 359,269
Derivative Asset [Abstract]
Derivative assets - Fair value	908	0
Derivative Liability [Abstract]
Derivative liabilities - Fair value	1,258	2,099
Derivative instruments designated as hedging instruments | Cash Flow Hedging | Interest rate contracts
Derivative Instruments
Notional Amount	275,000	275,000
Derivative Asset [Abstract]
Derivative assets - Fair value	0	0
Derivative Liability [Abstract]
Derivative liabilities - Fair value	1,258	1,864
Derivative instruments designated as hedging instruments | Net Investment Hedging | Foreign exchange contracts
Derivative Instruments
Notional Amount	83,936	84,269
Derivative Asset [Abstract]
Derivative assets - Fair value	908	0
Derivative Liability [Abstract]
Derivative liabilities - Fair value	0	235
Derivatives not designated as hedging instruments
Derivative Instruments
Notional Amount	22,005,910	21,341,158
Derivative Asset [Abstract]
Derivative assets - Fair value	456,409	602,754
Derivative Liability [Abstract]
Derivative liabilities - Fair value	342,877	422,729
Derivatives not designated as hedging instruments | Interest rate contracts
Derivative Instruments
Notional Amount	17,891,960	18,155,678
Derivative Asset [Abstract]
Derivative assets - Fair value	319,049	489,132
Derivative Liability [Abstract]
Derivative liabilities - Fair value	229,032	315,834
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivative Instruments
Notional Amount	4,036,958	3,108,488
Derivative Asset [Abstract]
Derivative assets - Fair value	38,654	30,300
Derivative Liability [Abstract]
Derivative liabilities - Fair value	27,287	22,524
Derivatives not designated as hedging instruments | Credit contracts
Derivative Instruments
Notional Amount	76,992	76,992
Derivative Asset [Abstract]
Derivative assets - Fair value	5	13
Derivative Liability [Abstract]
Derivative liabilities - Fair value	153	206
Derivatives not designated as hedging instruments | Equity contracts
Derivative Instruments
Notional Amount	0	0
Derivative Asset [Abstract]
Derivative assets - Fair value	272	858
Derivative Liability [Abstract]
Derivative liabilities - Fair value	0	0
Derivatives not designated as hedging instruments | Commodity contracts
Derivative Instruments
Notional Amount	0	0
Derivative Asset [Abstract]
Derivative assets - Fair value	98,429	82,451
Derivative Liability [Abstract]
Derivative liabilities - Fair value	$ 86,405	$ 84,165
Derivatives not designated as hedging instruments | Equity, Public Companies
Derivative Liability [Abstract]
Number of companies that issued the equity (issuers portion only) | company		2
Derivatives not designated as hedging instruments | Equity, Private Companies
Derivative Liability [Abstract]
Number of companies that issued the equity (issuers portion only) | company	18	17

Derivatives (Narrative) (Detail

Derivatives (Narrative) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021USD ($)BoeMMBTUcompany	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)BoeMMBTUcompany
Derivative [Line Items]
Derivative assets - Fair value	$ 457,317		$ 602,754
Derivative liabilities - Fair value	344,135		424,828
Credit-risk-related contingent features
Derivative [Line Items]
Aggregate fair value of derivative instruments in net liability position	64,900		107,400
Collateral posted	64,900		106,800
Derivative instruments designated as hedging instruments
Derivative [Line Items]
Derivative assets - Fair value	908		0
Notional Amount	358,936		359,269
Derivative liabilities - Fair value	1,258		2,099
Derivative instruments designated as hedging instruments | Fair Value Hedging | Interest Expense
Derivative [Line Items]
Gains or losses recognized on Consolidated Statement of Income related to the derivatives designated as fair value hedges		$ (1,400)
Derivative instruments designated as hedging instruments | Fair Value Hedging | Interest Expense | Deposits
Derivative [Line Items]
Gains or losses recognized on Consolidated Statement of Income related to the derivatives designated as fair value hedges	0
Derivative instruments designated as hedging instruments | Interest rate contracts | Cash Flow Hedging
Derivative [Line Items]
Derivative assets - Fair value	0		0
Net unrealized losses, net of tax, recorded in AOCI expected to be reclassified into earnings during next 12 months	(560)
Notional Amount	275,000		275,000
Derivative liabilities - Fair value	1,258		1,864
Derivative instruments designated as hedging instruments | Interest rate contracts | Fair Value Hedging
Derivative [Line Items]
Derivative assets - Fair value	0		0
Derivative instruments designated as hedging instruments | Interest rate contracts | Fair Value Hedging | Interest Expense
Derivative [Line Items]
Change in unrealized gains or losses on fair value hedging instruments	0	$ 2,000
Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative assets - Fair value	456,409		602,754
Notional Amount	22,005,910		21,341,158
Derivative liabilities - Fair value	342,877		422,729
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivative [Line Items]
Derivative assets - Fair value	38,654		30,300
Notional Amount	4,036,958		3,108,488
Derivative liabilities - Fair value	27,287		22,524
Derivatives not designated as hedging instruments | Interest rate contracts
Derivative [Line Items]
Derivative assets - Fair value	319,049		489,132
Notional Amount	17,891,960		18,155,678
Derivative liabilities - Fair value	229,032		315,834
Derivatives not designated as hedging instruments | Interest rate contracts | Financial Counterparty
Derivative [Line Items]
Notional Amount	8,960,000		9,090,000
Derivatives not designated as hedging instruments | Interest rate contracts | LCH
Derivative [Line Items]
Derivative assets - Fair value	27,200		1,300
Notional Amount	2,930,000		2,980,000
Derivative liabilities - Fair value	116,200		187,400
Derivatives not designated as hedging instruments | Credit contracts
Derivative [Line Items]
Derivative assets - Fair value	5		13
Notional Amount	76,992		76,992
Derivative liabilities - Fair value	153		206
Derivatives not designated as hedging instruments | Credit contracts | RPAs - protection sold
Derivative [Line Items]
Maximum exposure of RPAs with protection sold	$ 4,900		$ 6,000
Weighted average remaining maturity of outstanding RPAs	3 years 3 months 18 days		3 years 6 months
Derivatives not designated as hedging instruments | Equity, Public Companies
Derivative [Line Items]
Number of companies that issued the equity (issuers portion only) | company			2
Derivatives not designated as hedging instruments | Equity contracts
Derivative [Line Items]
Derivative assets - Fair value	$ 272		$ 858
Notional Amount	0		0
Derivative liabilities - Fair value	0		0
Derivatives not designated as hedging instruments | Commodity contracts
Derivative [Line Items]
Derivative assets - Fair value	98,429		82,451
Notional Amount	0		0
Derivative liabilities - Fair value	86,405		84,165
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME)
Derivative [Line Items]
Derivative assets - Fair value	897		7,900
Derivative liabilities - Fair value	10,000		3,700
Derivative assets (liabilities), at fair value, net	$ 0		$ 0
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME) | Oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	1,320		1,275
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME) | Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	27,850		29,733
Derivatives not designated as hedging instruments | Equity, Private Companies
Derivative [Line Items]
Number of companies that issued the equity (issuers portion only) | company	18		17
Maximum | Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivative [Line Items]
Original maturity (in years)	1 year		1 year

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	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flow Hedging | Interest rate contracts
Derivative [Line Items]
Gains recognized in AOCI	$ 426	$ 0
(Losses) reclassified from AOCI to interest expense	(177)	0
Net Investment Hedging | Foreign exchange contracts
Derivative [Line Items]
Gains recognized in AOCI	$ 101	$ 1,004

Derivatives (Derivatives Not De

Derivatives (Derivatives Not Designated as Hedging Instruments - Interest Rate Contracts) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative assets - Fair value	$ 457,317	$ 602,754
Derivative liabilities - Fair value	344,135	424,828
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	22,005,910	21,341,158
Derivative assets - Fair value	456,409	602,754
Derivative liabilities - Fair value	342,877	422,729
Derivatives not designated as hedging instruments | Interest rate contracts
Derivative [Line Items]
Notional Amount	17,891,960	18,155,678
Derivative assets - Fair value	319,049	489,132
Derivative liabilities - Fair value	229,032	315,834
Derivatives not designated as hedging instruments | Financial Counterparty | Interest rate contracts
Derivative [Line Items]
Notional Amount	8,960,000	9,090,000
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Written options
Derivative [Line Items]
Notional Amount	800,962	957,393
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	544	115
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Sold collars and corridors
Derivative [Line Items]
Notional Amount	531,840	518,477
Derivative assets - Fair value	5,849	7,673
Derivative liabilities - Fair value	158	0
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Swaps
Derivative [Line Items]
Notional Amount	7,597,856	7,586,414
Derivative assets - Fair value	279,361	479,634
Derivative liabilities - Fair value	53,975	1,364
Interest rate contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Interest rate contracts
Derivative [Line Items]
Notional Amount	8,930,658	9,062,284
Derivative assets - Fair value	285,210	487,307
Derivative liabilities - Fair value	54,677	1,479
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Purchased options
Derivative [Line Items]
Notional Amount	800,962	957,393
Derivative assets - Fair value	551	101
Derivative liabilities - Fair value	0	15
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Collars and corridors
Derivative [Line Items]
Notional Amount	531,840	518,477
Derivative assets - Fair value	160	0
Derivative liabilities - Fair value	5,888	7,717
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Swaps
Derivative [Line Items]
Notional Amount	7,628,500	7,617,524
Derivative assets - Fair value	33,128	1,724
Derivative liabilities - Fair value	168,467	306,623
Interest rate contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Interest rate contracts
Derivative [Line Items]
Notional Amount	8,961,302	9,093,394
Derivative assets - Fair value	33,839	1,825
Derivative liabilities - Fair value	$ 174,355	$ 314,355

Derivatives (Derivatives Not _2

Derivatives (Derivatives Not Designated as Hedging Instruments - Foreign Exchange Contracts) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Gross amounts recognized	$ 457,317	$ 602,754
Derivative liabilities - Fair value	344,135	424,828
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	22,005,910	21,341,158
Gross amounts recognized	456,409	602,754
Derivative liabilities - Fair value	342,877	422,729
Foreign exchange contracts | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	4,036,958	3,108,488
Gross amounts recognized	38,654	30,300
Derivative liabilities - Fair value	27,287	22,524
Foreign exchange contracts | Customer Counterparty | Forwards and spot | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	2,468,974	1,522,888
Gross amounts recognized	27,803	17,575
Derivative liabilities - Fair value	21,835	17,928
Foreign exchange contracts | Customer Counterparty | Swaps | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	184,584	13,590
Gross amounts recognized	1,902	872
Derivative liabilities - Fair value	247	91
Foreign exchange contracts | Customer Counterparty | Written options | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	116,575	117,729
Gross amounts recognized	0	0
Derivative liabilities - Fair value	336	574
Foreign exchange contracts | Customer Counterparty | Collars | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	3,167
Gross amounts recognized	0
Derivative liabilities - Fair value	11
Foreign exchange contracts | Customer Counterparty | Foreign exchange contracts | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	2,773,300	1,654,207
Gross amounts recognized	29,705	18,447
Derivative liabilities - Fair value	22,429	18,593
Foreign exchange contracts | Financial Counterparty | Forwards and spot | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	168,942	145,197
Gross amounts recognized	869	1,230
Derivative liabilities - Fair value	494	273
Foreign exchange contracts | Financial Counterparty | Swaps | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	974,974	1,191,355
Gross amounts recognized	7,733	10,049
Derivative liabilities - Fair value	4,364	3,658
Foreign exchange contracts | Financial Counterparty | Purchased options | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	116,575	117,729
Gross amounts recognized	336	574
Derivative liabilities - Fair value	0	0
Foreign exchange contracts | Financial Counterparty | Collars | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	3,167
Gross amounts recognized	11
Derivative liabilities - Fair value	0
Foreign exchange contracts | Financial Counterparty | Foreign exchange contracts | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	1,263,658	1,454,281
Gross amounts recognized	8,949	11,853
Derivative liabilities - Fair value	$ 4,858	$ 3,931

Derivatives (Derivatives Not _3

Derivatives (Derivatives Not Designated as Hedging Instruments - Credit Contracts) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative assets - Fair value	$ 457,317	$ 602,754
Derivative liabilities - Fair value	344,135	424,828
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	22,005,910	21,341,158
Derivative assets - Fair value	456,409	602,754
Derivative liabilities - Fair value	342,877	422,729
Credit contracts | Derivatives not designated as hedging instruments | Other credit derivatives
Derivative [Line Items]
Notional Amount	76,992	76,992
Derivative assets - Fair value	5	13
Derivative liabilities - Fair value	153	206
Credit contracts | Derivatives not designated as hedging instruments | Other credit derivatives | RPAs - protection sold
Derivative [Line Items]
Notional Amount	66,278	66,278
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	153	206
Credit contracts | Derivatives not designated as hedging instruments | Other credit derivatives | RPAs - protection purchased
Derivative [Line Items]
Notional Amount	10,714	10,714
Derivative assets - Fair value	5	13
Derivative liabilities - Fair value	$ 0	$ 0

Derivatives (Derivatives Not _4

Derivatives (Derivatives Not Designated as Hedging Instruments - Commodity Contracts) (Details) MMBTU in Thousands, Boe in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021USD ($)BoeMMBTU	Dec. 31, 2020USD ($)MMBTUBoe
Derivative [Line Items]
Derivative assets - Fair value	$ 457,317	$ 602,754
Derivative liabilities - Fair value	$ 344,135	$ 424,828
Customer Counterparty | Crude oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	8,258	6,321
Customer Counterparty | Natural gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	102,996	109,635
Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative assets - Fair value	$ 456,409	$ 602,754
Derivative liabilities - Fair value	342,877	422,729
Derivatives not designated as hedging instruments | Commodity contracts
Derivative [Line Items]
Derivative assets - Fair value	98,429	82,451
Derivative liabilities - Fair value	86,405	84,165
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Commodity contracts
Derivative [Line Items]
Derivative assets - Fair value	78,277	44,762
Derivative liabilities - Fair value	$ 20,218	$ 43,978
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Written options
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	248
Derivative assets - Fair value	$ 211
Derivative liabilities - Fair value	$ 25
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	2,361	2,022
Derivative assets - Fair value	$ 11,181	$ 2,344
Derivative liabilities - Fair value	$ 219	$ 2,193
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	5,649	4,299
Derivative assets - Fair value	$ 37,076	$ 9,282
Derivative liabilities - Fair value	$ 1,206	$ 14,283
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Crude oil | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	8,258	6,321
Derivative assets - Fair value	$ 48,468	$ 11,626
Derivative liabilities - Fair value	$ 1,450	$ 16,476
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Written options
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	8,065	597
Derivative assets - Fair value	$ 52	$ 0
Derivative liabilities - Fair value	$ 319	$ 59
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	10,823	12,733
Derivative assets - Fair value	$ 879	$ 1,063
Derivative liabilities - Fair value	$ 0	$ 205
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	84,108	96,305
Derivative assets - Fair value	$ 28,878	$ 32,073
Derivative liabilities - Fair value	$ 18,449	$ 27,238
Commodity contracts | Derivatives not designated as hedging instruments | Customer Counterparty | Natural gas | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	102,996	109,635
Derivative assets - Fair value	$ 29,809	$ 33,136
Derivative liabilities - Fair value	18,768	27,502
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Commodity contracts
Derivative [Line Items]
Derivative assets - Fair value	20,152	37,689
Derivative liabilities - Fair value	$ 66,187	$ 40,187
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Purchased options
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	248
Derivative assets - Fair value	$ 0
Derivative liabilities - Fair value	$ 48
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	2,361	2,022
Derivative assets - Fair value	$ 219	$ 2,217
Derivative liabilities - Fair value	$ 10,989	$ 2,402
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	5,649	4,299
Derivative assets - Fair value	$ 1,058	$ 8,220
Derivative liabilities - Fair value	$ 28,624	$ 7,135
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Crude oil | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | Boe	8,258	6,321
Derivative assets - Fair value	$ 1,277	$ 10,437
Derivative liabilities - Fair value	$ 39,661	$ 9,537
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Purchased options
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	8,065	597
Derivative assets - Fair value	$ 319	$ 59
Derivative liabilities - Fair value	$ 52	$ 0
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	14,023	16,293
Derivative assets - Fair value	$ 0	$ 205
Derivative liabilities - Fair value	$ 555	$ 813
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	91,790	103,973
Derivative assets - Fair value	$ 18,556	$ 26,988
Derivative liabilities - Fair value	$ 25,919	$ 29,837
Commodity contracts | Derivatives not designated as hedging instruments | Financial Counterparty | Natural gas | Commodity contracts
Derivative [Line Items]
Derivative, nonmonetary notional amount, energy measure | MMBTU	113,878	120,863
Derivative assets - Fair value	$ 18,875	$ 27,252
Derivative liabilities - Fair value	$ 26,526	$ 30,650

Derivatives (Net Gains (Losses)

Derivatives (Net Gains (Losses) on Derivatives Not Designated as Hedging Instruments) (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	$ 24,669	$ (3,840)
Interest rate contracts | Interest rate contracts and other derivative income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	13,901	(7,011)
Foreign exchange contracts | Foreign exchange income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	10,243	2,861
Credit contracts | Interest rate contracts and other derivative income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	45	(23)
Equity contracts | Lending fees
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	311	309
Commodity contracts | Interest rate contracts and other derivative income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	$ 169	$ 24

Derivatives (Offsetting of Deri

Derivatives (Offsetting of Derivatives) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative assets
Derivative assets - Fair value	$ 457,317	$ 602,754
Less: Master netting agreements	(100,454)	(93,063)
Less: Cash collateral received/pledged	(7,781)	(8,449)
Net derivative assets	349,082	501,242
Less: Security Collateral Received	0	(35)
Net Amount	349,082	501,207
Contracts not subject to master netting arrangements, gross amounts recognized	532	1,100
Derivative, cash collateral received, including amount offset by fair value assets, and excess cash amount	11,900	15,800
Amount used to offset against derivative assets	7,781	8,449
Derivative liabilities
Gross amounts recognized	344,135	424,828
Less: Master netting agreements	(100,454)	(93,063)
Less: Cash collateral received/pledged	(86,233)	(91,634)
Net derivative liabilities	157,448	240,131
Less: Security Collateral Pledged	(64,816)	(221,150)
Net Amount	92,632	18,981
Contracts not subject to master netting arrangements, gross amounts recognized	151	220
Derivative, cash collateral posted against derivative liabilities, including amount offset the derivative fair value liabilities, and excess cash amount	90,800	91,600
Amount used to offset against derivative liabilities	$ 86,233	$ 91,634

Loans Receivable and Allowanc_3

Loans Receivable and Allowance for Credit Losses (Composition of Loans Held-for-Investment) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	$ 39,588,748	$ 38,390,955
Allowance for loan losses	(607,506)	(619,983)	$ (557,003)	$ (358,287)
Loans held-for-investment, net	38,981,242	37,770,972
Net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts	(76,900)	(58,800)
CARES Act, Paycheck Protection Program
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Net origination fees	(34,300)	(12,700)
Commercial and industrial (“C&I”) | CARES Act, Paycheck Protection Program
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	2,070,000	1,570,000
Commercial lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	29,169,913	28,440,027
Commercial lending | Commercial and industrial (“C&I”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	14,081,110	13,631,726
Allowance for loan losses	(394,084)	(398,040)	(362,629)	(238,376)
Commercial lending | Commercial real estate (“CRE”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	11,563,034	11,174,611
Allowance for loan losses	(146,399)	(163,791)	(132,819)	(40,509)
Commercial lending | Real estate loan | Multifamily residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	3,066,515	3,033,998
Allowance for loan losses	(27,407)	(27,573)	(16,530)	(22,826)
Commercial lending | Construction and land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	459,254	599,692
Allowance for loan losses	(19,089)	(10,239)	(11,018)	(19,404)
Commercial lending | Total CRE
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	15,088,803	14,808,301
Consumer lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	10,418,835	9,950,928
Consumer lending | Real estate loan | Single-family residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	8,524,287	8,185,953
Allowance for loan losses	(15,839)	(15,520)	(26,822)	(28,527)
Consumer lending | HELOCs
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	1,749,172	1,601,716
Allowance for loan losses	(2,670)	(2,690)	(3,881)	(5,265)
Consumer lending | Total residential mortgage
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	10,273,459	9,787,669
Consumer lending | Other consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	145,376	163,259
Allowance for loan losses	$ (2,018)	$ (2,130)	$ (3,304)	$ (3,380)

Loans Receivable and Allowanc_4

Loans Receivable and Allowance for Credit Losses (Composition of Loans Held-for-Investment- Narrative) (Details)	3 Months Ended
	Mar. 31, 2021USD ($)loan	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Accrued interest receivable	$ 106,600,000		$ 107,500,000
Loans receivable pledged to secure borrowings and to provide additional borrowing capacity from the FRB and the FHLB	23,591,704,000		$ 23,263,517,000
HELOCs
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Converted to term loan	44,300,000	$ 31,300,000
Commercial and industrial (“C&I”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Converted to term loan	0	0
Commercial real estate (“CRE”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Converted to term loan	$ 5,000,000	$ 0
Financing receivable number converted to term loans | loan	2

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 ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	$ 3,250,204	$ 9,787,213
Fiscal Year before Current Fiscal Year	8,870,539	6,816,315
Two Years before Current Fiscal Year	6,356,839	5,125,324
Three Years before Current Fiscal Year	4,762,757	3,167,275
Four Years before Current Fiscal Year	2,944,099	1,547,971
Prior	4,549,488	3,277,221
Revolving Loans Amortized Cost Basis	8,541,074	8,390,152
Revolving Loans Converted to Term Loans Amortized Cost Basis	313,748	279,484
Total	39,588,748	38,390,955
Federal Housing Administration Loan
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Financing receivable, recorded investment, 90 days past due and still accruing, classified as pass	647	747
Commercial lending
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	2,579,695	7,390,682
Fiscal Year before Current Fiscal Year	6,434,251	5,000,429
Two Years before Current Fiscal Year	4,650,080	3,619,488
Three Years before Current Fiscal Year	3,372,479	2,129,478
Four Years before Current Fiscal Year	1,972,539	1,013,095
Prior	3,073,789	2,244,535
Revolving Loans Amortized Cost Basis	7,033,649	6,993,769
Revolving Loans Converted to Term Loans Amortized Cost Basis	53,431	48,551
Total	29,169,913	28,440,027
Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	1,716,561	4,034,455
Fiscal Year before Current Fiscal Year	3,190,361	1,577,608
Two Years before Current Fiscal Year	1,322,029	562,750
Three Years before Current Fiscal Year	436,496	283,807
Four Years before Current Fiscal Year	261,763	75,933
Prior	290,354	253,079
Revolving Loans Amortized Cost Basis	6,834,219	6,814,607
Revolving Loans Converted to Term Loans Amortized Cost Basis	29,327	29,487
Total	14,081,110	13,631,726
Commercial lending | Commercial and industrial (“C&I”) | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	1,661,034	3,912,147
Fiscal Year before Current Fiscal Year	3,043,315	1,477,740
Two Years before Current Fiscal Year	1,220,618	483,725
Three Years before Current Fiscal Year	385,813	245,594
Four Years before Current Fiscal Year	228,364	69,482
Prior	280,748	245,615
Revolving Loans Amortized Cost Basis	6,492,230	6,431,003
Revolving Loans Converted to Term Loans Amortized Cost Basis	29,327	29,487
Total	13,341,449	12,894,793
Commercial lending | Commercial and industrial (“C&I”) | Criticized (Accrual)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	55,239	120,183
Fiscal Year before Current Fiscal Year	145,506	74,601
Two Years before Current Fiscal Year	83,989	56,785
Three Years before Current Fiscal Year	29,315	19,426
Four Years before Current Fiscal Year	18,541	1,487
Prior	6,809	5,872
Revolving Loans Amortized Cost Basis	274,726	324,640
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	614,125	602,994
Commercial lending | Commercial and industrial (“C&I”) | Criticized (Nonaccrual)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	288	2,125
Fiscal Year before Current Fiscal Year	1,540	25,267
Two Years before Current Fiscal Year	17,422	22,240
Three Years before Current Fiscal Year	21,368	18,787
Four Years before Current Fiscal Year	14,858	4,964
Prior	2,797	1,592
Revolving Loans Amortized Cost Basis	67,263	58,964
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	125,536	133,939
Commercial lending | Commercial real estate (“CRE”)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	693,541	2,344,108
Fiscal Year before Current Fiscal Year	2,337,933	2,465,790
Two Years before Current Fiscal Year	2,418,618	2,396,262
Three Years before Current Fiscal Year	2,320,640	1,427,625
Four Years before Current Fiscal Year	1,351,490	734,788
Prior	2,223,167	1,613,707
Revolving Loans Amortized Cost Basis	193,541	173,267
Revolving Loans Converted to Term Loans Amortized Cost Basis	24,104	19,064
Total	11,563,034	11,174,611
Commercial lending | Commercial real estate (“CRE”) | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	664,626	2,296,649
Fiscal Year before Current Fiscal Year	2,303,031	2,402,136
Two Years before Current Fiscal Year	2,354,998	2,310,748
Three Years before Current Fiscal Year	2,253,230	1,328,251
Four Years before Current Fiscal Year	1,284,384	732,694
Prior	2,128,975	1,529,681
Revolving Loans Amortized Cost Basis	193,541	173,267
Revolving Loans Converted to Term Loans Amortized Cost Basis	24,104	19,064
Total	11,206,889	10,792,490
Commercial lending | Commercial real estate (“CRE”) | Criticized (Accrual)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	28,915	47,459
Fiscal Year before Current Fiscal Year	34,902	63,654
Two Years before Current Fiscal Year	63,620	43,447
Three Years before Current Fiscal Year	25,343	98,259
Four Years before Current Fiscal Year	61,238	2,094
Prior	91,993	80,662
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	306,011	335,575
Commercial lending | Commercial real estate (“CRE”) | Criticized (Nonaccrual)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	42,067
Three Years before Current Fiscal Year	42,067	1,115
Four Years before Current Fiscal Year	5,868	0
Prior	2,199	3,364
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	50,134	46,546
Commercial lending | Real estate loan | Multifamily residential
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	160,470	783,671
Fiscal Year before Current Fiscal Year	764,482	784,324
Two Years before Current Fiscal Year	762,732	503,764
Three Years before Current Fiscal Year	493,979	418,046
Four Years before Current Fiscal Year	359,286	181,477
Prior	519,677	356,821
Revolving Loans Amortized Cost Basis	5,889	5,895
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	3,066,515	3,033,998
Commercial lending | Real estate loan | Multifamily residential | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	160,470	783,671
Fiscal Year before Current Fiscal Year	764,482	783,589
Two Years before Current Fiscal Year	762,001	479,959
Three Years before Current Fiscal Year	470,223	411,945
Four Years before Current Fiscal Year	352,094	181,213
Prior	488,260	348,751
Revolving Loans Amortized Cost Basis	5,889	5,895
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	3,003,419	2,995,023
Commercial lending | Real estate loan | Multifamily residential | Criticized (Accrual)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year before Current Fiscal Year	0	735
Two Years before Current Fiscal Year	731	22,330
Three Years before Current Fiscal Year	22,309	6,101
Four Years before Current Fiscal Year	6,067	264
Prior	29,296	5,877
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	58,403	35,307
Commercial lending | Real estate loan | Multifamily residential | Criticized (Nonaccrual)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	1,475
Three Years before Current Fiscal Year	1,447	0
Four Years before Current Fiscal Year	1,125	0
Prior	2,121	2,193
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	4,693	3,668
Commercial lending | Construction and land
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	9,123	228,448
Fiscal Year before Current Fiscal Year	141,475	172,707
Two Years before Current Fiscal Year	146,701	156,712
Three Years before Current Fiscal Year	121,364	0
Four Years before Current Fiscal Year	0	20,897
Prior	40,591	20,928
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	459,254	599,692
Commercial lending | Construction and land | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	5,642	224,924
Fiscal Year before Current Fiscal Year	141,475	172,707
Two Years before Current Fiscal Year	146,701	156,712
Three Years before Current Fiscal Year	121,364	0
Four Years before Current Fiscal Year	0	20,897
Prior	20,691	1,028
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	435,873	576,268
Commercial lending | Construction and land | Criticized (Accrual)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	3,481	3,524
Fiscal 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	19,900
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	3,481	23,424
Commercial lending | Construction and land | Criticized (Nonaccrual)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal 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	19,900	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	19,900	0
Commercial lending | Total CRE
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	863,134	3,356,227
Fiscal Year before Current Fiscal Year	3,243,890	3,422,821
Two Years before Current Fiscal Year	3,328,051	3,056,738
Three Years before Current Fiscal Year	2,935,983	1,845,671
Four Years before Current Fiscal Year	1,710,776	937,162
Prior	2,783,435	1,991,456
Revolving Loans Amortized Cost Basis	199,430	179,162
Revolving Loans Converted to Term Loans Amortized Cost Basis	24,104	19,064
Total	15,088,803	14,808,301
Consumer lending
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	670,509	2,396,531
Fiscal Year before Current Fiscal Year	2,436,288	1,815,886
Two Years before Current Fiscal Year	1,706,759	1,505,836
Three Years before Current Fiscal Year	1,390,278	1,037,797
Four Years before Current Fiscal Year	971,560	534,876
Prior	1,475,699	1,032,686
Revolving Loans Amortized Cost Basis	1,507,425	1,396,383
Revolving Loans Converted to Term Loans Amortized Cost Basis	260,317	230,933
Total	10,418,835	9,950,928
Consumer lending | Real estate loan | Single-family residential
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	669,660	2,385,853
Fiscal Year before Current Fiscal Year	2,427,430	1,814,855
Two Years before Current Fiscal Year	1,706,060	1,502,472
Three Years before Current Fiscal Year	1,386,855	1,023,496
Four Years before Current Fiscal Year	958,900	525,283
Prior	1,375,382	933,994
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	8,524,287	8,185,953
Consumer lending | Real estate loan | Single-family residential | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	669,660	2,385,853
Fiscal Year before Current Fiscal Year	2,427,430	1,813,200
Two Years before Current Fiscal Year	1,704,855	1,501,660
Three Years before Current Fiscal Year	1,385,623	1,021,707
Four Years before Current Fiscal Year	956,307	523,170
Prior	1,360,015	921,714
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	8,503,890	8,167,304
Consumer lending | Real estate loan | Single-family residential | Criticized (Accrual)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year before Current Fiscal Year	0	1,429
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	194	0
Four Years before Current Fiscal Year	347	119
Prior	2,207	1,034
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	2,748	2,582
Consumer lending | Real estate loan | Single-family residential | Criticized (Nonaccrual)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year before Current Fiscal Year	0	226
Two Years before Current Fiscal Year	1,205	812
Three Years before Current Fiscal Year	1,038	1,789
Four Years before Current Fiscal Year	2,246	1,994
Prior	13,160	11,246
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	17,649	16,067
Consumer lending | HELOCs
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	0	1,131
Fiscal Year before Current Fiscal Year	690	1,031
Two Years before Current Fiscal Year	699	3,364
Three Years before Current Fiscal Year	3,423	9,980
Four Years before Current Fiscal Year	8,338	9,593
Prior	16,770	15,437
Revolving Loans Amortized Cost Basis	1,458,935	1,330,247
Revolving Loans Converted to Term Loans Amortized Cost Basis	260,317	230,933
Total	1,749,172	1,601,716
Consumer lending | HELOCs | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	0	1,131
Fiscal Year before Current Fiscal Year	690	880
Two Years before Current Fiscal Year	548	2,879
Three Years before Current Fiscal Year	3,235	5,363
Four Years before Current Fiscal Year	4,319	8,433
Prior	14,931	13,475
Revolving Loans Amortized Cost Basis	1,458,199	1,328,919
Revolving Loans Converted to Term Loans Amortized Cost Basis	255,538	225,810
Total	1,737,460	1,586,890
Consumer lending | HELOCs | Criticized (Accrual)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	200
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	996
Prior	1	0
Revolving Loans Amortized Cost Basis	287	1,328
Revolving Loans Converted to Term Loans Amortized Cost Basis	547	606
Total	835	3,130
Consumer lending | HELOCs | Criticized (Nonaccrual)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year before Current Fiscal Year	0	151
Two Years before Current Fiscal Year	151	285
Three Years before Current Fiscal Year	188	4,617
Four Years before Current Fiscal Year	4,019	164
Prior	1,838	1,962
Revolving Loans Amortized Cost Basis	449	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	4,232	4,517
Total	10,877	11,696
Consumer lending | Total residential mortgage
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	669,660	2,386,984
Fiscal Year before Current Fiscal Year	2,428,120	1,815,886
Two Years before Current Fiscal Year	1,706,759	1,505,836
Three Years before Current Fiscal Year	1,390,278	1,033,476
Four Years before Current Fiscal Year	967,238	534,876
Prior	1,392,152	949,431
Revolving Loans Amortized Cost Basis	1,458,935	1,330,247
Revolving Loans Converted to Term Loans Amortized Cost Basis	260,317	230,933
Total	10,273,459	9,787,669
Consumer lending | Other consumer
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	849	9,547
Fiscal Year before Current Fiscal Year	8,168	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	4,321
Four Years before Current Fiscal Year	4,322	0
Prior	83,547	83,255
Revolving Loans Amortized Cost Basis	48,490	66,136
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	145,376	163,259
Consumer lending | Other consumer | Pass
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	849	9,531
Fiscal Year before Current Fiscal Year	8,168	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	1,830
Four Years before Current Fiscal Year	1,830	0
Prior	83,547	83,255
Revolving Loans Amortized Cost Basis	48,455	66,136
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	142,849	160,752
Consumer lending | Other consumer | Criticized (Accrual)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year		16
Fiscal Year before Current Fiscal Year		0
Two Years before Current Fiscal Year		0
Three Years before Current Fiscal Year		0
Four Years before Current Fiscal Year		0
Prior		0
Revolving Loans Amortized Cost Basis		0
Revolving Loans Converted to Term Loans Amortized Cost Basis		0
Total		16
Consumer lending | Other consumer | Criticized (Nonaccrual)
Financing Receivable, Vintage Year/Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	2,491
Four Years before Current Fiscal Year	2,492	0
Prior	0	0
Revolving Loans Amortized Cost Basis	35	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	$ 2,527	$ 2,491

Loans Receivable and Allowanc_6

Loans Receivable and Allowance for Credit Losses (Aging Analysis on Loans Held-for-Investment) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Nonaccrual and Past Due Loans
Current accruing loans	$ 39,269,817	$ 38,125,211
Total Accruing Past Due Loans	86,969	50,590
Total Nonaccrual Loans	231,962	215,154
Total	39,588,748	38,390,955
Accruing Loans 30-59  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	43,943	44,136
Accruing Loans 60-89  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	43,026	6,454
Commercial lending
Nonaccrual and Past Due Loans
Current accruing loans	28,898,105	28,224,064
Total Accruing Past Due Loans	71,545	31,810
Total Nonaccrual Loans	200,263	184,153
Total	29,169,913	28,440,027
Commercial lending | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Current accruing loans	13,923,524	13,488,070
Total Accruing Past Due Loans	32,050	9,717
Total Nonaccrual Loans	125,536	133,939
Total	14,081,110	13,631,726
Commercial lending | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Current accruing loans	11,473,405	11,127,690
Total Accruing Past Due Loans	39,495	375
Total Nonaccrual Loans	50,134	46,546
Total	11,563,034	11,174,611
Commercial lending | Real estate loan | Multifamily residential
Nonaccrual and Past Due Loans
Current accruing loans	3,061,822	3,028,512
Total Accruing Past Due Loans	0	1,818
Total Nonaccrual Loans	4,693	3,668
Total	3,066,515	3,033,998
Commercial lending | Construction and land
Nonaccrual and Past Due Loans
Current accruing loans	439,354	579,792
Total Accruing Past Due Loans	0	19,900
Total Nonaccrual Loans	19,900	0
Total	459,254	599,692
Commercial lending | Total CRE
Nonaccrual and Past Due Loans
Current accruing loans	14,974,581	14,735,994
Total Accruing Past Due Loans	39,495	22,093
Total Nonaccrual Loans	74,727	50,214
Total	15,088,803	14,808,301
Commercial lending | Accruing Loans 30-59  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	32,105	31,086
Commercial lending | Accruing Loans 30-59  Days Past Due | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	26,417	8,993
Commercial lending | Accruing Loans 30-59  Days Past Due | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	5,688	375
Commercial lending | Accruing Loans 30-59  Days Past Due | Real estate loan | Multifamily residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	1,818
Commercial lending | Accruing Loans 30-59  Days Past Due | Construction and land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	19,900
Commercial lending | Accruing Loans 30-59  Days Past Due | Total CRE
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	5,688	22,093
Commercial lending | Accruing Loans 60-89  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	39,440	724
Commercial lending | Accruing Loans 60-89  Days Past Due | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	5,633	724
Commercial lending | Accruing Loans 60-89  Days Past Due | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	33,807	0
Commercial lending | Accruing Loans 60-89  Days Past Due | Real estate loan | Multifamily residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Commercial lending | Accruing Loans 60-89  Days Past Due | Construction and land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Commercial lending | Accruing Loans 60-89  Days Past Due | Total CRE
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	33,807	0
Consumer lending
Nonaccrual and Past Due Loans
Current accruing loans	10,371,712	9,901,147
Total Accruing Past Due Loans	15,424	18,780
Total Nonaccrual Loans	31,699	31,001
Total	10,418,835	9,950,928
Consumer lending | Real estate loan | Single-family residential
Nonaccrual and Past Due Loans
Current accruing loans	8,493,416	8,156,645
Total Accruing Past Due Loans	12,575	12,494
Total Nonaccrual Loans	18,296	16,814
Total	8,524,287	8,185,953
Consumer lending | HELOCs
Nonaccrual and Past Due Loans
Current accruing loans	1,735,692	1,583,968
Total Accruing Past Due Loans	2,603	6,052
Total Nonaccrual Loans	10,877	11,696
Total	1,749,172	1,601,716
Consumer lending | Total residential mortgage
Nonaccrual and Past Due Loans
Current accruing loans	10,229,108	9,740,613
Total Accruing Past Due Loans	15,178	18,546
Total Nonaccrual Loans	29,173	28,510
Total	10,273,459	9,787,669
Consumer lending | Other consumer
Nonaccrual and Past Due Loans
Current accruing loans	142,604	160,534
Total Accruing Past Due Loans	246	234
Total Nonaccrual Loans	2,526	2,491
Total	145,376	163,259
Consumer lending | Accruing Loans 30-59  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	11,838	13,050
Consumer lending | Accruing Loans 30-59  Days Past Due | Real estate loan | Single-family residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	9,827	9,911
Consumer lending | Accruing Loans 30-59  Days Past Due | HELOCs
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,769	2,922
Consumer lending | Accruing Loans 30-59  Days Past Due | Total residential mortgage
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	11,596	12,833
Consumer lending | Accruing Loans 30-59  Days Past Due | Other consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	242	217
Consumer lending | Accruing Loans 60-89  Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	3,586	5,730
Consumer lending | Accruing Loans 60-89  Days Past Due | Real estate loan | Single-family residential
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,748	2,583
Consumer lending | Accruing Loans 60-89  Days Past Due | HELOCs
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	834	3,130
Consumer lending | Accruing Loans 60-89  Days Past Due | Total residential mortgage
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	3,582	5,713
Consumer lending | Accruing Loans 60-89  Days Past Due | Other consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	$ 4	$ 17

Loans Receivable and Allowanc_7

Loans Receivable and Allowance for Credit Losses (Amortized Cost of Loans on Nonaccrual Status) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	$ 151,785	$ 126,676
Commercial lending
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	135,927	110,096
Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	63,312	62,040
Commercial lending | Commercial real estate (“CRE”)
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	49,137	45,537
Commercial lending | Real estate loan | Multifamily residential
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	3,578	2,519
Commercial lending | Construction and land
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	19,900	0
Commercial lending | Total CRE
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	72,615	48,056
Consumer lending
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	15,858	16,580
Consumer lending | Real estate loan | Single-family residential
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	6,014	6,013
Consumer lending | HELOCs
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	7,353	8,076
Consumer lending | Total residential mortgage
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	13,367	14,089
Consumer lending | Other consumer
Financing Receivable, Nonaccrual [Line Items]
Total nonaccrual loans with no related allowance for loan losses	$ 2,491	$ 2,491

Loans Receivable and Allowanc_8

Loans Receivable and Allowance for Credit Losses (Loans Receivable Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Nonaccrual loans
Loans on nonaccrual status	$ 231,962	$ 215,154
Foreclosed assets
Other assets, foreclosed assets	26,200	19,700
Residential real estate properties
Foreclosed assets
Recorded investment in consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process	$ 5,800	$ 4,100

Loans Receivable and Allowanc_9

Loans Receivable and Allowance for Credit Losses (Additions to TDRs) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)loan	Mar. 31, 2020USD ($)loan
Loans Modified as TDRs
Number of Loans | loan	1	3
Pre- Modification Outstanding Recorded Investment	$ 443	$ 16,604
Post-Modification Outstanding Recorded Investment	433	15,735
Financial Impact	203	98
Principal
Loans Modified as TDRs
Post-Modification Outstanding Recorded Investment	433	4,564
Principal and Interest
Loans Modified as TDRs
Post-Modification Outstanding Recorded Investment	$ 0	$ 11,171
Commercial lending | Commercial and industrial (“C&I”)
Loans Modified as TDRs
Number of Loans | loan	1	3
Pre- Modification Outstanding Recorded Investment	$ 443	$ 16,604
Post-Modification Outstanding Recorded Investment	433	15,735
Financial Impact	203	98
Commercial lending | Commercial and industrial (“C&I”) | Principal
Loans Modified as TDRs
Post-Modification Outstanding Recorded Investment	433	4,564
Commercial lending | Commercial and industrial (“C&I”) | Principal and Interest
Loans Modified as TDRs
Post-Modification Outstanding Recorded Investment	$ 0	$ 11,171

Loans Receivable and Allowan_10

Loans Receivable and Allowance for Credit Losses (TDR Post-Modifications) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment	$ 433	$ 15,735
Commitment to lend	2,200		$ 3,000
Principal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment	433	4,564
Principal and Interest
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment	0	11,171
Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment	433	15,735
Commercial lending | Commercial and industrial (“C&I”) | Principal
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment	433	4,564
Commercial lending | Commercial and industrial (“C&I”) | Principal and Interest
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment	$ 0	$ 11,171

Loans Receivable and Allowan_11

Loans Receivable and Allowance for Credit Losses (Loans Modified as TDRs that Subsequently Defaulted) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)loan	Mar. 31, 2020loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1	0
Recorded Investment | $	$ 11,538
Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans | loan	1
Recorded Investment | $	$ 11,538

Loans Receivable and Allowan_12

Loans Receivable and Allowance for Credit Losses (Summary of Activities in Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Allowance for loan losses
Allowance for loan losses, beginning of period	$ 619,983	$ 358,287
Provision for (reversal of) credit losses on loans	1,048	74,656
Gross charge-offs	(15,899)	(12,957)
Gross recoveries	2,493	12,059
Total net (charge-offs) recoveries	(13,406)	(898)
Foreign currency translation adjustment	(119)	(200)
Allowance for loan losses, end of period	607,506	557,003
Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13
Allowance for loan losses
Allowance for loan losses, beginning of period		125,158
Commercial lending | Commercial and industrial (“C&I”)
Allowance for loan losses
Allowance for loan losses, beginning of period	398,040	238,376
Provision for (reversal of) credit losses on loans	3,839	60,618
Gross charge-offs	(8,436)	(11,977)
Gross recoveries	760	1,575
Total net (charge-offs) recoveries	(7,676)	(10,402)
Foreign currency translation adjustment	(119)	(200)
Allowance for loan losses, end of period	394,084	362,629
Commercial lending | Commercial and industrial (“C&I”) | Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13
Allowance for loan losses
Allowance for loan losses, beginning of period		74,237
Commercial lending | Commercial real estate (“CRE”)
Allowance for loan losses
Allowance for loan losses, beginning of period	163,791	40,509
Provision for (reversal of) credit losses on loans	(10,277)	11,435
Gross charge-offs	(7,195)	(954)
Gross recoveries	80	9,660
Total net (charge-offs) recoveries	(7,115)	8,706
Foreign currency translation adjustment	0	0
Allowance for loan losses, end of period	146,399	132,819
Commercial lending | Commercial real estate (“CRE”) | Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13
Allowance for loan losses
Allowance for loan losses, beginning of period		72,169
Commercial lending | Residential loan | Multifamily residential
Allowance for loan losses
Allowance for loan losses, beginning of period	27,573	22,826
Provision for (reversal of) credit losses on loans	(1,391)	1,281
Gross charge-offs	(17)	0
Gross recoveries	1,242	535
Total net (charge-offs) recoveries	1,225	535
Foreign currency translation adjustment	0	0
Allowance for loan losses, end of period	27,407	16,530
Commercial lending | Residential loan | Multifamily residential | Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13
Allowance for loan losses
Allowance for loan losses, beginning of period		(8,112)
Commercial lending | Construction and land
Allowance for loan losses
Allowance for loan losses, beginning of period	10,239	19,404
Provision for (reversal of) credit losses on loans	8,592	1,482
Gross charge-offs	(71)	0
Gross recoveries	329	21
Total net (charge-offs) recoveries	258	21
Foreign currency translation adjustment	0	0
Allowance for loan losses, end of period	19,089	11,018
Commercial lending | Construction and land | Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13
Allowance for loan losses
Allowance for loan losses, beginning of period		(9,889)
Consumer lending | Residential loan | Single-family residential
Allowance for loan losses
Allowance for loan losses, beginning of period	15,520	28,527
Provision for (reversal of) credit losses on loans	376	1,700
Gross charge-offs	(134)	0
Gross recoveries	77	265
Total net (charge-offs) recoveries	(57)	265
Foreign currency translation adjustment	0	0
Allowance for loan losses, end of period	15,839	26,822
Consumer lending | Residential loan | Single-family residential | Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13
Allowance for loan losses
Allowance for loan losses, beginning of period		(3,670)
Consumer lending | HELOCs
Allowance for loan losses
Allowance for loan losses, beginning of period	2,690	5,265
Provision for (reversal of) credit losses on loans	22	412
Gross charge-offs	(45)	0
Gross recoveries	3	2
Total net (charge-offs) recoveries	(42)	2
Foreign currency translation adjustment	0	0
Allowance for loan losses, end of period	2,670	3,881
Consumer lending | HELOCs | Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13
Allowance for loan losses
Allowance for loan losses, beginning of period		(1,798)
Consumer lending | Other consumer
Allowance for loan losses
Allowance for loan losses, beginning of period	2,130	3,380
Provision for (reversal of) credit losses on loans	(113)	(2,272)
Gross charge-offs	(1)	(26)
Gross recoveries	2	1
Total net (charge-offs) recoveries	1	(25)
Foreign currency translation adjustment	0	0
Allowance for loan losses, end of period	$ 2,018	3,304
Consumer lending | Other consumer | Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13
Allowance for loan losses
Allowance for loan losses, beginning of period		$ 2,221

Loans Receivable and Allowan_13

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	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Allowance for unfunded credit reserves
Allowance for unfunded credit commitments, beginning of period	$ 33,500
Provision for credit losses	0	$ 73,870
Allowance for unfunded credit commitments, end of period	32,400
Unfunded Credit Commitments
Allowance for unfunded credit reserves
Allowance for unfunded credit commitments, beginning of period	33,577	11,158
Provision for credit losses	(1,048)	(786)
Allowance for unfunded credit commitments, end of period	32,529	20,829
Cumulative Effect, Period Of Adoption, Adjustment
Allowance for unfunded credit reserves
Allowance for unfunded credit commitments, beginning of period	$ 0	$ 10,457

Loans Receivable and Allowan_14

Loans Receivable and Allowance for Credit Losses (Allowance for Credit Losses Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Financing Receivable Allowance for Credit Losses
Financing receivable and off balance sheet credit loss allowance	$ 640,000		$ 653,600
Decrease in allowance for credit losses	(13,600)
Provision for (reversal of) credit losses	0	$ 73,870
Commercial lending
Financing Receivable Allowance for Credit Losses
Collateral dependent loan	99,900		97,200
Consumer lending
Financing Receivable Allowance for Credit Losses
Collateral dependent loan	16,600		$ 17,300
Commercial and consumer lending
Financing Receivable Allowance for Credit Losses
Decrease to allowance for loan losses	(12,500)
Decrease in allowance for unfunded credit commitments	$ (1,100)

Loans Receivable and Allowan_15

Loans Receivable and Allowance for Credit Losses (Loan Purchases, Sales And Transfers Narrative) (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Real estate loan | Single Family Residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-sale	$ 0	$ 1,800,000

Loans Receivable and Allowan_16

Loans Receivable and Allowance for Credit Losses (Loan Purchases, Sales and Transfers) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	$ 145,872,000	$ 110,223,000
Sales	153,417,000	114,865,000
Purchases	310,848,000	133,180,000
Allowance for loan and lease losses, Loans transferred from held-for-investment to held-for-sales, write-offs	39,000	0
Net gains on sales of loans	1,781,000	950,000
Commercial and industrial (“C&I”) | Originated
Loans Receivable and Allowance for Credit Losses
Sales	131,000,000	114,900,000
Loans sold in secondary market | Purchased
Loans Receivable and Allowance for Credit Losses
Sales	22,400,000	0
Commercial lending | Commercial and industrial (“C&I”)
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	125,840,000	102,973,000
Sales	125,879,000	102,973,000
Purchases	178,678,000	130,583,000
Commercial lending | Commercial real estate (“CRE”)
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	20,032,000	7,250,000
Sales	20,032,000	7,250,000
Purchases	0	0
Commercial lending | Real estate loan | Multifamily residential
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	0	0
Sales	0	0
Purchases	370,000	1,513,000
Consumer lending | Real estate loan | Single-family residential
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	0	0
Sales	7,506,000	4,642,000
Purchases	$ 131,800,000	$ 1,084,000

Investments in Qualified Affo_3

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities (Investments in Qualified Affordable Housing Partnerships, Net) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities [Abstract]
Minimum compliance period for qualified affordable housing partnerships to fully utilize the tax credits (in years)	15 years
Investments in Qualified Affordable Housing Partnerships, Net, And Related Unfunded Commitments [Abstract]
Investments in qualified affordable housing partnerships, net	$ 284,862		$ 213,555
Accrued expenses and other liabilities — Unfunded commitments	142,103		$ 77,444
Additional Information related to Investments in Qualified Affordable Housing Partnerships, Net [Abstract]
Tax credits and other tax benefits recognized	11,028	$ 11,031
Amortization expense included in income tax expense	$ 8,712	$ 8,384

Investments in Qualified Affo_4

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities (Investments in Tax Credit and Other Investments, Net) (Details)	3 Months Ended
	Mar. 31, 2021USD ($)credit	Mar. 31, 2020USD ($)credit	Dec. 31, 2020USD ($)
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract]
Investments in tax credit and other investments, net	$ 361,438,000		$ 266,525,000
Accrued expenses and other liabilities — Unfunded commitments	192,644,000		105,282,000
Amortization expense of tax credit and other investments	25,358,000	$ 18,782,000
Unrealized gains (losses) recognized on equity securities with readily determinable fair values	(497,000)	38,000
Adjustments to equity securities without readily determinable fair values	$ 0	$ 0
Number of recovered historic tax credit investments | credit	1	1
Investment in tax credit and other investments
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract]
OTTI charges	$ 0	$ 0
Pre-tax recoveries	374,000	$ 150,000
Tax credit investments
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract]
Equity securities with readily determinable fair values	26,700,000		31,300,000
Investments in Tax Credit and Other Investments and Other Assets
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract]
Equity securities without readily determinable fair values	$ 27,200,000		$ 23,700,000

Investments in Qualified Affo_5

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities (Variable Interest Entities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investments in Tax Credit and Other Investments, Net [Line Items]
Fair Value	$ 7,789,213	$ 5,544,658
Collateralized loan obligations (“CLOs”)
Investments in Tax Credit and Other Investments, Net [Line Items]
Fair Value	291,466	287,494
Collateralized loan obligations (“CLOs”) | AFS debt securities
Investments in Tax Credit and Other Investments, Net [Line Items]
Fair Value	$ 291,500	$ 287,500

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets (Goodwill & Impairment Analysis) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 465,697,000		$ 465,697,000
Goodwill impairment		$ 0
Changes in the carrying amount of goodwill	$ 0	$ 0

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets (Core Deposit Intangibles) (Details) - Core Deposit Intangibles - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross balance	$ 86,099,000		$ 86,099,000
Accumulated amortization	(80,454,000)		(79,722,000)
Net Carrying Balance	5,645,000		$ 6,377,000
Impairment write downs on the core deposit intangibles	$ 0	$ 0

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets (Amortization Expense of Core Deposit Intangibles and Estimated Future Amortization Expense ) (Details) - Core Deposit Intangibles - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense related to the core deposit intangible assets	$ 732	$ 953
Estimated future amortization expense
Remainder of 2021	2,017
2022	1,865
2023	1,199
2024	553
2025	11
Net Carrying Balance	$ 5,645		$ 6,377

Commitments and Contingencies_2

Commitments and Contingencies (Credit-Related Commitments) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loan commitments
Commitments to Extend Credit
Expire in One Year or Less	$ 3,090,244
Expire After One Year Through Three Years	1,943,216
Expire After Three Years Through Five Years	638,815
Expire After Five Years	172,171
Total	5,844,446	$ 5,690,917
Commercial letters of credit and SBLCs
Commitments to Extend Credit
Expire in One Year or Less	1,263,991
Expire After One Year Through Three Years	398,670
Expire After Three Years Through Five Years	166,496
Expire After Five Years	513,202
Total	2,342,359	2,240,813
Commitments to Extend Credit
Commitments to Extend Credit
Expire in One Year or Less	4,354,235
Expire After One Year Through Three Years	2,341,886
Expire After Three Years Through Five Years	805,311
Expire After Five Years	685,373
Total	$ 8,186,805	$ 7,931,730

Commitments and Contingencies_3

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Commitments to Extend Credit
Letters of credit	$ 2,340,000	$ 2,240,000
Allowance for unfunded credit commitments	32,400	33,500
Accrued expenses and other liabilities
Other Commitments
Unfunded commitments for investments in AHP and other tax credit investments	334,700	182,700
Single Family and Multi-family Residential Loans | Loans Sold or Securitized with Recourse | Loans Sold or Securitized With Recourse
Commitments to Extend Credit
Allowance for unfunded credit commitments	83	88
Standby Letters of Credit
Commitments to Extend Credit
Letters of credit	2,220,000	2,120,000
Commercial Letters of Credit
Commitments to Extend Credit
Letters of credit	$ 125,000	$ 124,900

Commitments and Contingencies_4

Commitments and Contingencies (Guarantees Outstanding) (Details) - Loans Sold or Securitized With Recourse - Loans Sold or Securitized with Recourse - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Guarantor obligation, maximum potential future payment [Abstract]
Expire After One Year Through Three Years	$ 587
Expire After Three Years Through Five Years	369
Expire After Five Years	24,520
Total	25,476	$ 26,198
Carrying Value	35,403	37,145
Single Family Residential
Guarantor obligation, maximum potential future payment [Abstract]
Expire After One Year Through Three Years	392
Expire After Three Years Through Five Years	369
Expire After Five Years	9,525
Total	10,286	10,526
Carrying Value	10,286	10,526
Multifamily residential
Guarantor obligation, maximum potential future payment [Abstract]
Expire After One Year Through Three Years	195
Expire After Three Years Through Five Years	0
Expire After Five Years	14,995
Total	15,190	15,672
Carrying Value	$ 25,117	$ 26,619

Stock Compensation Plans (Narra

Stock Compensation Plans (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	0	0
Time-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost	$ 37
Weighted average period to recognize unrecognized compensation cost	2 years 2 months 15 days
Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost	$ 22.1
Weighted average period to recognize unrecognized compensation cost	2 years 3 months 14 days
Performance-Based RSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential for awards to vest (as a percent)	0.00%
Performance-Based RSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential for awards to vest (as a percent)	200.00%
Performance-Based RSUs | Cliff
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
RSUs | Cliff
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years

Stock Compensation Plans (Summa

Stock Compensation Plans (Summary of Total Share-Based Compensation Expense and Related Net Tax Benefits) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Total Share-based Stock Compensation Expense and Related Net Tax Benefit [Abstract]
Stock compensation costs	$ 7,817	$ 7,209
Related net tax benefits (deficiencies) for stock compensation plans	$ 1,620	$ (1,566)

Stock Compensation Plans (Sum_2

Stock Compensation Plans (Summary of Activity for Time-Based and Performance-Based RSUs) (Details)	3 Months Ended
	Mar. 31, 2021$ / sharesshares
Time-Based RSUs Settled in Shares
Shares
Outstanding, at beginning of period (in shares)	1,345,635
Granted (in shares)	374,875
Vested (in shares)	(275,503)
Forfeited (in shares)	(26,369)
Outstanding, at end of period (in shares)	1,418,638
Weighted-Average Grant Date Fair Value
Outstanding, at beginning of period (in dollars per share) | $ / shares	$ 50.22
Granted (in dollars per share) | $ / shares	71.40
Vested (in dollars per share) | $ / shares	67.30
Forfeited (in dollars per share) | $ / shares	60.94
Outstanding, at end of period (in dollars per share) | $ / shares	$ 52.30
Performance-Based RSUs Settled in Shares
Shares
Outstanding, at beginning of period (in shares)	398,057
Granted (in shares)	91,960
Vested (in shares)	(120,286)
Forfeited (in shares)	0
Outstanding, at end of period (in shares)	369,731
Weighted-Average Grant Date Fair Value
Outstanding, at beginning of period (in dollars per share) | $ / shares	$ 53.66
Granted (in dollars per share) | $ / shares	77.67
Vested (in dollars per share) | $ / shares	70.13
Forfeited (in dollars per share) | $ / shares	0
Outstanding, at end of period (in dollars per share) | $ / shares	$ 54.28
Time-Based RSUs Settled in Cash
Shares
Outstanding, at beginning of period (in shares)	21,802
Granted (in shares)	15,803
Vested (in shares)	0
Forfeited (in shares)	(4,075)
Outstanding, at end of period (in shares)	33,530

Stockholders' Equity and Earn_3

Stockholders' Equity and Earnings Per Share (Earnings Per Share Calculation) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic:
Net income	$ 204,994	$ 144,824
Basic weighted-average number of shares outstanding (in shares)	141,646	144,814
Basic EPS (in dollars per share)	$ 1.45	$ 1
Diluted:
Net income	$ 204,994	$ 144,824
Basic weighted-average number of shares outstanding (in shares)	141,646	144,814
Diluted potential common shares (in shares)	1,198	471
Diluted weighted-average number of shares outstanding (in shares)	142,844	145,285
Diluted EPS (in dollars per share)	$ 1.44	$ 1

Stockholders' Equity and Earn_4

Stockholders' Equity and Earnings Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Stockholders' Equity and Earnings Per Share [Line Items]
Stock repurchase program, amount authorized			$ 500
Repurchased by company (in shares)			4,471,682
Average price (in dollars per share)			$ 32.64
Total cost			$ 146
RSUs
Stockholders' Equity and Earnings Per Share [Line Items]
Weighted-average anti-dilutive shares (in shares)	140,000	328,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 5,269,175	$ 5,017,617
Other comprehensive (loss) income	(134,365)	25,289
Ending balance	5,285,027	4,902,985
AFS Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	52,247	(2,419)
Net unrealized gains (losses) arising during the period	(133,313)	28,530
Amounts reclassified from AOCI	(135)	(1,077)
Other comprehensive (loss) income	(133,448)	27,453
Ending balance	(81,201)	25,034
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,230)	0
Net unrealized gains (losses) arising during the period	305	0
Amounts reclassified from AOCI	127	0
Other comprehensive (loss) income	432	0
Ending balance	(798)	0
Foreign Currency Translation Adjustments, Net of Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(6,692)	(15,989)
Net unrealized gains (losses) arising during the period	(1,349)	(2,164)
Amounts reclassified from AOCI	0	0
Other comprehensive (loss) income	(1,349)	(2,164)
Ending balance	(8,041)	(18,153)
AOCI, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	44,325	(18,408)
Net unrealized gains (losses) arising during the period	(134,357)	26,366
Amounts reclassified from AOCI	(8)	(1,077)
Other comprehensive (loss) income	(134,365)	25,289
Ending balance	$ (90,040)	$ 6,881

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Before-Tax
Net change	$ (190,174)	$ 37,198
Tax Effect
Net change	55,809	(11,909)
Net-of-Tax
Other comprehensive (loss) income	(134,365)	25,289
AFS Debt Securities
Before-Tax
Net unrealized (losses) gains arising during the period	(189,276)	40,493
Net realized (gains) losses reclassified into net income	(192)	(1,529)
Net change	(189,468)	38,964
Tax Effect
Net unrealized gains arising during the period	55,963	(11,963)
Net realized (gains) losses reclassified into net income	57	452
Net change	56,020	(11,511)
Net-of-Tax
Net unrealized gains (losses) arising during the period	(133,313)	28,530
Net realized (gains) losses reclassified into net income	(135)	(1,077)
Other comprehensive (loss) income	(133,448)	27,453
Cash Flow Hedges
Before-Tax
Net unrealized (losses) gains arising during the period	426	0
Net realized (gains) losses reclassified into net income	177	0
Net change	603	0
Tax Effect
Net unrealized gains arising during the period	(121)	0
Net realized (gains) losses reclassified into net income	(50)	0
Net change	(171)	0
Net-of-Tax
Net unrealized gains (losses) arising during the period	305	0
Net realized (gains) losses reclassified into net income	127	0
Other comprehensive (loss) income	432	0
Foreign Currency Translation Adjustments, Net of Hedges
Before-Tax
Net unrealized (losses) gains arising during the period	(1,309)	(1,766)
Net change	(1,309)	(1,766)
Tax Effect
Net unrealized gains arising during the period	(40)	(398)
Net change	(40)	(398)
Net-of-Tax
Net unrealized gains (losses) arising during the period	(1,349)	(2,164)
Net realized (gains) losses reclassified into net income	0	0
Other comprehensive (loss) income	(1,349)	(2,164)
AOCI, Net of Tax
Net-of-Tax
Net unrealized gains (losses) arising during the period	(134,357)	26,366
Net realized (gains) losses reclassified into net income	(8)	(1,077)
Other comprehensive (loss) income	$ (134,365)	$ 25,289

Business Segments (Narrative) (

Business Segments (Narrative) (Details)	3 Months Ended
	Mar. 31, 2021segment
Segment Reporting [Abstract]
Number of reportable segments	3
Number of core segments	2

Business Segments (Operating Re

Business Segments (Operating Results and Other Key Financial Measures) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting Information
Net interest income before (reversal of) provision for credit losses	$ 353,695	$ 362,707
Provision for (reversal of) credit losses	0	73,870
Noninterest income	72,866	55,506
Noninterest expense	191,077	180,333
Segment income (loss) before income taxes	235,484	164,010
Segment net income	204,994	144,824
Segment assets	56,874,146	45,948,545	$ 52,156,913
Consumer and Business Banking
Segment Reporting Information
Net interest income before (reversal of) provision for credit losses	149,899	152,591
Provision for (reversal of) credit losses	(4,249)	7,788
Noninterest income	20,828	16,402
Noninterest expense	89,286	86,964
Segment income (loss) before income taxes	85,690	74,241
Segment net income	61,378	53,195
Segment assets	14,147,094	11,894,691
Commercial Banking
Segment Reporting Information
Net interest income before (reversal of) provision for credit losses	177,092	183,501
Provision for (reversal of) credit losses	4,249	66,082
Noninterest income	50,010	32,456
Noninterest expense	69,257	70,126
Segment income (loss) before income taxes	153,596	79,749
Segment net income	110,080	57,131
Segment assets	27,222,272	26,412,726
Other
Segment Reporting Information
Net interest income before (reversal of) provision for credit losses	26,704	26,615
Provision for (reversal of) credit losses	0	0
Noninterest income	2,028	6,648
Noninterest expense	32,534	23,243
Segment income (loss) before income taxes	(3,802)	10,020
Segment net income	33,536	34,498
Segment assets	$ 15,504,780	$ 7,641,128

Subsequent Events (Details)

Subsequent Events (Details)	May 17, 2021$ / shares
Subsequent Event
Subsequent events
Dividends payable (in dollars per share)	$ 0.33

Uncategorized Items - ewbc-2021

Label	Element	Value
Accounting Standards Update 2016-13 [Member]
Accounting Standards Update [Extensible List]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]