Hope Bancorp (HOPE) 10-Q 8 Nov 21 2021 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2021	Nov. 03, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	000-50245
Entity Registrant Name	HOPE BANCORP INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-4849715
Entity Address, Address Line One	3200 Wilshire Boulevard,
Entity Address, Address Line Two	Suite 1400
Entity Address, City or Town	Los Angeles
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90010
City Area Code	213
Local Phone Number	639-1700
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	HOPE
Security Exchange Name	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 (in shares)		120,199,986
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001128361
Current Fiscal Year End Date	--12-31

Consolidated Statements Of Fina

Consolidated Statements Of Financial Condition - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Cash and cash equivalents:
Cash and due from banks	$ 283,993	$ 256,565
Interest bearing cash in other banks	343,359	94,014
Total cash and cash equivalents	627,352	350,579
Interest bearing deposits in other financial institutions	12,340	28,642
Securities available for sale, at fair value	2,669,489	2,285,611
Equity investments	58,512	59,699
Loans held for sale, at the lower of cost or fair value	179,117	17,743
Loans receivable, net of allowance for credit losses of $136,774 and $206,741 at September 30, 2021 and December 31, 2020, respectively	13,281,917	13,356,472
Other real estate owned (“OREO”), net	15,213	20,121
Federal Home Loan Bank (“FHLB”) stock, at cost	17,250	17,250
Premises and equipment, net	45,307	48,409
Accrued interest receivable	47,102	59,430
Deferred tax assets, net	33,055	47,693
Customers’ liabilities on acceptances	1,808	1,184
Bank owned life insurance (“BOLI”)	76,756	76,765
Investments in affordable housing partnerships	61,154	69,454
Operating lease right-of-use assets, net	50,603	47,653
Goodwill	464,450	464,450
Core deposit intangible assets, net	8,180	9,708
Servicing assets, net	10,787	12,692
Other assets	138,634	133,109
Total assets	17,799,026	17,106,664
Deposits:
Noninterest bearing	6,007,586	4,814,254
Interest bearing:
Money market and NOW accounts	5,871,567	5,232,413
Savings deposits	314,603	300,770
Time deposits	2,868,771	3,986,475
Total deposits	15,062,527	14,333,912
FHLB advances	200,000	250,000
Convertible notes, net	215,974	204,565
Subordinated debentures, net	105,057	104,178
Accrued interest payable	5,367	14,706
Acceptances outstanding	1,808	1,184
Operating lease liabilities	55,095	52,030
Commitments to fund investments in affordable housing partnerships	10,286	15,148
Other liabilities	68,514	77,196
Total liabilities	15,724,628	15,052,919
STOCKHOLDERS’ EQUITY:
Common stock, $0.001 par value; 150,000,000 authorized shares: issued and outstanding 136,347,068 and 120,198,061 shares, respectively, at September 30, 2021, and issued and outstanding 135,926,445 and 123,264,864 shares, respectively, at December 31, 2020	136	136
Additional paid-in capital	1,420,151	1,434,916
Retained earnings	897,766	785,940
Treasury stock, at cost; 16,149,007 and 12,661,581 shares at September 30, 2021 and December 31, 2020, respectively	(247,198)	(200,000)
Accumulated other comprehensive income, net	3,543	32,753
Total stockholders’ equity	2,074,398	2,053,745
Total liabilities and stockholders’ equity	$ 17,799,026	$ 17,106,664

Consolidated Statements Of Fi_2

Consolidated Statements Of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Allowance for credit loss	$ 136,774	$ 206,741
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	136,347,068	135,926,445
Common stock, shares outstanding (in shares)	120,198,061	123,264,864
Treasury stock, at cost, shares repurchased (in shares)	16,149,007	12,661,581

Consolidated Statements Of Inco

Consolidated Statements Of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
INTEREST INCOME:
Interest and fees on loans	$ 132,794	$ 134,430	$ 394,353	$ 422,850
Interest on securities	9,207	9,848	24,835	30,348
Interest on other investments	865	942	2,175	3,951
Total interest income	142,866	145,220	421,363	457,149
INTEREST EXPENSE:
Interest on deposits	9,640	22,871	33,106	93,435
Interest on FHLB advances	640	1,323	1,913	6,208
Interest on other borrowings and convertible notes	2,290	3,389	6,892	10,764
Total interest expense	12,570	27,583	41,911	110,407
NET INTEREST INCOME BEFORE PROVISION (CREDIT) FOR CREDIT LOSSES	130,296	117,637	379,452	346,742
PROVISION (CREDIT) FOR CREDIT LOSSES	(10,000)	22,000	(13,700)	67,500
NET INTEREST INCOME AFTER PROVISION (CREDIT) FOR CREDIT LOSSES	140,296	95,637	393,152	279,242
NONINTEREST INCOME:
Service fees on deposit accounts	1,814	2,736	5,381	9,452
International service fees	889	987	2,525	2,443
Loan servicing fees, net	642	772	2,620	2,243
Wire transfer fees	836	892	2,603	2,710
Swap fees	293	434	525	2,450
Net gains on sales of SBA loans	2,459	0	4,834	0
Net gains on sales of residential mortgage loans	781	2,853	3,905	6,386
Net gains on sales of securities available for sale	0	7,531	0	7,531
Other income and fees	2,903	1,308	8,104	8,802
Total noninterest income	10,617	17,513	30,497	42,017
NONINTEREST EXPENSE:
Salaries and employee benefits	47,018	40,659	130,543	122,011
Occupancy	7,473	7,264	21,507	21,717
Furniture and equipment	4,429	4,513	13,437	13,426
Advertising and marketing	2,656	1,601	6,378	4,589
Data processing and communications	2,394	2,204	7,542	7,109
Professional fees	2,431	1,513	9,729	6,323
Investments in affordable housing partnership expenses	2,646	3,876	8,300	9,300
FDIC assessments	1,204	1,167	3,743	4,378
Credit related expenses	1,266	1,793	3,527	4,816
OREO expense, net	248	1,770	827	3,951
FHLB advance prepayment fee	0	3,584	0	3,584
Software impairment	0	0	2,146	0
Other	3,737	3,462	11,377	11,372
Total noninterest expense	75,502	73,406	219,056	212,576
INCOME BEFORE INCOME TAXES	75,411	39,744	204,593	108,683
INCOME TAX PROVISION	19,912	9,254	51,644	25,487
NET INCOME	$ 55,499	$ 30,490	$ 152,949	$ 83,196
EARNINGS PER COMMON SHARE
Basic (in dollars per share)	$ 0.45	$ 0.25	$ 1.24	$ 0.67
Diluted (in dollars per share)	$ 0.45	$ 0.25	$ 1.23	$ 0.67

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 55,499,000	$ 30,490,000	$ 152,949,000	$ 83,196,000
Other comprehensive (loss) income:
Change in unrealized net holding (losses) gains on securities available for sale	(16,433,000)	(303,000)	(43,050,000)	41,820,000
Change in unrealized net holding gains (losses) on interest rate swaps used in cash flow hedges	120,000	54,000	1,643,000	(796,000)
Reclassification adjustments for net losses (gains) realized in net income	88,000	(7,510,000)	227,000	(7,649,000)
Tax effect	4,717,000	2,292,000	11,970,000	(9,842,000)
Other comprehensive (loss) income, net of tax	(11,508,000)	(5,467,000)	(29,210,000)	23,533,000
Total comprehensive income	$ 43,991,000	$ 25,023,000	$ 123,739,000	$ 106,729,000

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Stockholders' Equity (Unaudited) - USD ($)	Total	Common stock	Additional paid-in capital	Retained earnings	Treasury stock	Accumulated other comprehensive income, net
Balance at beginning of period (in shares) at Dec. 31, 2019		125,756,543
Balance at beginning of period at Dec. 31, 2019	$ 2,036,011,000	$ 136,000	$ 1,428,066,000	$ 762,480,000	$ (163,820,000)	$ 9,149,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2020-06	(26,729,000)			(26,729,000)
Adoption of ASU 2020-06 tax impact	$ 7,947,000			(7,947,000)
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-13 [Member]
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations (in shares)		220,251
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations	$ 0		0
Stock-based compensation	4,707,000		4,707,000
Cash dividends declared on common stock	(51,924,000)			(51,924,000)
Comprehensive income:
Net income	83,196,000			83,196,000
Other comprehensive income (loss)	23,533,000					23,533,000
Repurchase of treasury stock, (in shares)		(2,716,034)
Repurchase of treasury stock	(36,180,000)				(36,180,000)
Balance at end of period (in shares) at Sep. 30, 2020		123,260,760
Balance at end of period at Sep. 30, 2020	2,040,561,000	$ 136,000	1,432,773,000	774,970,000	(200,000,000)	32,682,000
Balance at beginning of period (in shares) at Dec. 31, 2019		125,756,543
Balance at beginning of period at Dec. 31, 2019	$ 2,036,011,000	$ 136,000	1,428,066,000	762,480,000	(163,820,000)	9,149,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	Accounting Standards Update 2020-06 [Member]
Balance at end of period (in shares) at Dec. 31, 2020		123,264,864
Balance at end of period at Dec. 31, 2020	$ 2,053,745,000	$ 136,000	1,434,916,000	785,940,000	(200,000,000)	32,753,000
Balance at beginning of period (in shares) at Jun. 30, 2020		123,239,276
Balance at beginning of period at Jun. 30, 2020	2,030,776,000	$ 136,000	1,430,757,000	761,734,000	(200,000,000)	38,149,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations (in shares)		21,484
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations	0		0
Stock-based compensation	2,016,000		2,016,000
Cash dividends declared on common stock	(17,254,000)			(17,254,000)
Comprehensive income:
Net income	30,490,000			30,490,000
Other comprehensive income (loss)	(5,467,000)					(5,467,000)
Balance at end of period (in shares) at Sep. 30, 2020		123,260,760
Balance at end of period at Sep. 30, 2020	2,040,561,000	$ 136,000	1,432,773,000	774,970,000	(200,000,000)	32,682,000
Balance at beginning of period (in shares) at Dec. 31, 2020		123,264,864
Balance at beginning of period at Dec. 31, 2020	2,053,745,000	$ 136,000	1,434,916,000	785,940,000	(200,000,000)	32,753,000
Balance at end of period (in shares) at Jun. 30, 2021		123,673,832
Balance at end of period at Jun. 30, 2021	2,092,870,000	$ 136,000	1,418,135,000	859,548,000	(200,000,000)	15,051,000
Balance at beginning of period (in shares) at Dec. 31, 2020		123,264,864
Balance at beginning of period at Dec. 31, 2020	2,053,745,000	$ 136,000	1,434,916,000	785,940,000	(200,000,000)	32,753,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations (in shares)		420,623
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations	0		0
Stock-based compensation	3,501,000		3,501,000
Cash dividends declared on common stock	(51,838,000)			(51,838,000)
Comprehensive income:
Net income	152,949,000			152,949,000
Other comprehensive income (loss)	(29,210,000)					(29,210,000)
Repurchase of treasury stock, (in shares)		(3,487,426)
Repurchase of treasury stock	(47,198,000)				(47,198,000)
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature	(10,705,000)
AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature, tax	3,154,000
Balance at end of period (in shares) at Sep. 30, 2021		120,198,061
Balance at end of period at Sep. 30, 2021	2,074,398,000	$ 136,000	1,420,151,000	897,766,000	(247,198,000)	3,543,000
Comprehensive income:
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt			(21,420,000)
AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt, tax			3,154,000
Balance at beginning of period (in shares) at Jun. 30, 2021		123,673,832
Balance at beginning of period at Jun. 30, 2021	2,092,870,000	$ 136,000	1,418,135,000	859,548,000	(200,000,000)	15,051,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations (in shares)		11,655
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations	0		0
Stock-based compensation	2,016,000		2,016,000
Cash dividends declared on common stock	(17,281,000)			(17,281,000)
Comprehensive income:
Net income	55,499,000			55,499,000
Other comprehensive income (loss)	$ (11,508,000)					(11,508,000)
Repurchase of treasury stock, (in shares)	(3,487,426)	(3,487,426)
Repurchase of treasury stock	$ (47,198,000)				(47,198,000)
Balance at end of period (in shares) at Sep. 30, 2021		120,198,061
Balance at end of period at Sep. 30, 2021	$ 2,074,398,000	$ 136,000	$ 1,420,151,000	897,766,000	$ (247,198,000)	$ 3,543,000
Comprehensive income:
Convertible debt, cumulative effect on retained earnings before tax				$ 10,715,000

Consolidated Statements Of Ch_2

Consolidated Statements Of Changes In Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends declared on common stock (in dollars per share)	$ 0.14	$ 0.14	$ 0.42	$ 0.42

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 152,949,000	$ 83,196,000
Adjustments to reconcile net income to net cash from operating activities:
Discount accretion, net of depreciation and amortization	19,815,000	5,942,000
Stock-based compensation expense	6,835,000	5,980,000
(Credit) provision for credit losses	(13,700,000)	67,500,000
Provision for accrued interest receivables on loans	770,000	0
Valuation adjustment of OREO	583,000	3,492,000
Net gains on sales of SBA loans	(4,834,000)	0
Net gains on sales of residential mortgage loans	(3,905,000)	(6,386,000)
Loss (earnings) on BOLI	9,000	(1,049,000)
Net gains on sales and calls of securities available for sale	0	(7,531,000)
Losses on investments in affordable housing partnerships	8,080,000	9,088,000
Payment of FHLB prepayment fee	0	3,584,000
Software impairment	2,146,000	0
Net change in deferred income taxes	29,988,000	(13,728,000)
Proceeds from sales of loans held for sale	178,520,000	251,092,000
Originations of loans held for sale	(150,720,000)	(206,798,000)
Originations of servicing assets	(2,039,000)	(2,326,000)
Net change in accrued interest receivable	11,558,000	(27,217,000)
Net change in other assets	4,842,000	(61,135,000)
Net change in accrued interest payable	(9,339,000)	(11,819,000)
Net change in other liabilities	(8,682,000)	30,389,000
Net cash provided by operating activities	222,876,000	122,274,000
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of interest bearing deposits in other financial institutions	(1,992,000)	(19,103,000)
Redemption of interest bearing deposits in other financial institutions	18,294,000	17,920,000
Purchase of securities available for sale	(993,912,000)	(867,723,000)
Proceeds from matured, called, or paid-down securities available for sale	552,757,000	388,647,000
Proceeds from sale of securities available for sale	0	168,069,000
Proceeds from sale of equity investments	819,000	201,000
Proceeds from sales of other loans held for sale previously classified as held for investment	179,291,000	1,053,000
Purchase of loans receivable	(214,988,000)	0
Net change in loans receivable	(59,412,000)	(832,267,000)
Proceeds from sales of OREO	3,297,000	2,458,000
Purchase of FHLB stock	0	(1,346,000)
Redemption of FHLB stock	0	3,503,000
Purchase of premises and equipment	(4,753,000)	(4,048,000)
Proceeds from BOLI death benefits	1,847,000	0
Investments in affordable housing partnerships	(3,596,000)	(11,506,000)
Net cash used in investing activities	(522,348,000)	(1,154,142,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Net change in deposits	728,615,000	1,480,992,000
Proceeds from FHLB advances	1,540,000,000	1,010,000,000
Repayment of FHLB advances	(1,590,000,000)	(1,438,584,000)
Purchase of treasury stock	(47,198,000)	(36,777,000)
Cash dividends paid on common stock	(51,838,000)	(51,924,000)
Taxes paid in net settlement of restricted stock	(3,334,000)	(1,273,000)
Net cash provided by financing activities	576,245,000	962,434,000
NET CHANGE IN CASH AND CASH EQUIVALENTS	276,773,000	(69,434,000)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	350,579,000	698,567,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	627,352,000	629,133,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest paid	49,667,000	117,560,000
Income taxes paid	43,149,000	33,365,000
SUPPLEMENTAL DISCLOSURES OF NON-CASH ACTIVITIES
Transfer from loans receivable to OREO	0	979,000
Transfer from loans receivable to loans held for sale	374,034,000	1,002,000
Transfer from loans held for sale to loans receivable	3,404,000	2,384,000
Lease liabilities arising from obtaining right-of-use assets	$ 965,000	$ 0

Hope Bancorp, Inc.

Hope Bancorp, Inc.	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Hope Bancorp, Inc.	Hope Bancorp, Inc.Hope Bancorp, Inc. (“Hope Bancorp” on a parent-only basis and the “Company” on a consolidated basis), headquartered in Los Angeles, California, is the holding company for Bank of Hope (the “Bank”). As of September 30, 2021, the Bank operated branches in California, Washington, Texas, Illinois, Alabama, Virginia, New Jersey, and New York, loan production offices in Colorado, Texas, Oregon, Washington, Georgia, Southern California, and Northern California, and a representative office in Seoul, South Korea. The Company is a corporation organized under the laws of the state of Delaware and a bank holding company registered under the Bank Holding Company Act of 1956, as amended.

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2021
Basis Of Presentation [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements included herein have been prepared without an audit, pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”), except for the Consolidated Statement of Financial Condition as of December 31, 2020 which was from the audited financial statements included in the Company’s 2020 Annual Report on Form 10-K. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to such SEC rules and regulations. The consolidated financial statements include the accounts of Hope Bancorp and its wholly owned subsidiaries, principally Bank of Hope. All intercompany transactions and balances have been eliminated in consolidation. The Company has made all adjustments, that in the opinion of management, are necessary to fairly present the Company’s financial position at September 30, 2021 and December 31, 2020 and the results of operations for the three and nine months ended September 30, 2021 and 2020. Certain reclassifications have been made to prior period amounts to conform to the current year presentation. The results of operations for the interim periods are not necessarily indicative of results to be anticipated for the full year. The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ significantly from those estimates. The global pandemic resulting from the outbreak of the novel strain of coronavirus (“COVID-19”) substantially and negatively impacted the United States economy, disrupted global supply chains. During the worst of the pandemic, there were temporary closures of countless businesses and the institution of social distancing and sheltering in place requirements in most states and communities. Many states have now relaxed most of the business closures and other social distancing requirements, and the economy has significantly recovered from the worst of the pandemic. In line with this recovery, the Company experienced improvements in operating results for the three and nine months ended September 30, 2021 when compared to the three and nine months ended September 30, 2020. There continues to be some uncertainty around variants of the COVID-19 virus as well as the pace and sustainability of the economic recovery. The Company could experience a material and adverse effect on its business as a result of the impact of the COVID-19 pandemic, and the resulting governmental actions to curtail its spread. It is at least reasonably possible that information which was available to the Company at the date of the financial statements will change in the near term due to the COVID-19 pandemic and that the effect of the change could be material to the financial statements. The extent to which the COVID-19 pandemic will impact the Company’s estimates and assumptions is uncertain. These unaudited consolidated financial statements should be read along with the audited consolidated financial statements and accompanying notes included in the Company’s 2020 Annual Report on Form 10-K.

Earnings Per Share ("EPS")

Earnings Per Share ("EPS")	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share ("EPS")	Earnings Per Share (“EPS”) Basic EPS does not reflect the possibility of dilution that could result from the issuance of additional shares of common stock upon exercise or conversion of outstanding equity awards or convertible notes and is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if stock options, convertible notes, employee stock purchase program (“ESPP”) shares, or other contracts to issue common stock were exercised or converted to common stock that would then share in earnings. For the three months ended September 30, 2021 and 2020, stock options and restricted share awards of 934,036 and 1,206,040 shares of common stock, respectively, were excluded in computing diluted earnings per common share because they were anti-dilutive. For the nine months ended September 30, 2021 and 2020, stock options and restricted shares awards of 743,553 and 876,565 shares of common stock, respectively, were excluded in computing diluted earnings per common share because they were anti-dilutive. The Company previously issued $217.5 million in convertible senior notes maturing on May 15, 2038. The convertible notes can be converted into the Company’s shares of common stock at an initial rate of 45.0760 shares per $1,000 principal amount of the notes (See footnote 10 “Subordinated Debentures and Convertible Notes” for additional information regarding convertible notes issued). With the adoption of ASU 2020-06, the if-converted method is required for calculating dilutive EPS for all convertible instruments since the treasury stock method is no longer available. Under the if-converted method, the denominator of the diluted EPS calculation is adjusted to reflect the full number of common shares issuable upon conversion, while the numerator is adjusted to add back after-tax interest expense for the period. For the three and nine months ended September 30, 2021 and 2020, shares related to the convertible notes issued were not included in the Company’s diluted EPS calculation. In accordance with the terms of the convertible notes and settlement options available to the Company, no shares would have been delivered to investors of the convertible notes based on the Company’s common stock price during the three and nine months ended September 30, 2021 and 2020 as the conversion price exceeded the market price of the Company’s stock. The following tables show the computation of basic and diluted EPS for the three and nine months ended September 30, 2021 and 2020. Three Months Ended September 30, 2021 2020 Net Income Weighted-Average Shares Earnings Net Income Weighted-Average Shares Earnings (Dollars in thousands, except share and per share data) Basic EPS - common stock $ 55,499 122,244,948 $ 0.45 $ 30,490 123,251,336 $ 0.25 Effect of dilutive securities: Stock options, restricted stock, and ESPP shares 663,588 285,429 Diluted EPS - common stock $ 55,499 122,908,536 $ 0.45 $ 30,490 123,536,765 $ 0.25 Nine Months Ended September 30, 2021 2020 Net Income Weighted-Average Shares Earnings Net Income Weighted-Average Shares Earnings (Dollars in thousands, except share and per share data) Basic EPS - common stock $ 152,949 123,050,174 $ 1.24 $ 83,196 123,581,055 $ 0.67 Effect of dilutive securities: Stock options, restricted stock, and ESPP shares 798,338 314,029 Diluted EPS - common stock $ 152,949 123,848,512 $ 1.23 $ 83,196 123,895,084 $ 0.67

Equity Investments

Equity Investments	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Equity Investments	Equity Investments Equity investments with readily determinable fair values at September 30, 2021 and December 31, 2020, consisted of mutual funds in the amounts of $27.1 million and $27.6 million, respectively, and were included in “Equity investments” on the Consolidated Statements of Financial Condition. The changes in fair value for equity investments with readily determinable fair values for the three and nine months ended September 30, 2021 and 2020 were recorded in other noninterest income and fees as summarized in the table below: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (Dollars in thousands) Net change in fair value recorded during the period on equity investments with readily determinable fair value $ (127) $ — $ (534) $ 542 Net change in fair value recorded on equity investments sold during the period — — — — Net change in fair value on equity investments with readily determinable fair values $ (127) $ — $ (534) $ 542 At September 30, 2021 and December 31, 2020, the Company also had equity investments without readily determinable fair values which are carried at cost less any determined impairment. The balance of these investments is adjusted for changes in subsequent observable prices. At September 30, 2021, the total balance of equity investments without readily determinable fair values included in “Equity investments” on the Consolidated Statements of Financial Condition was $31.4 million, consisting of $370 thousand in correspondent bank stock, $1.0 million in Community Development Financial Institutions (“CDFI”) investments, and $30.1 million in Community Reinvestment Act (“CRA”) investments. At December 31, 2020, the total balance of equity investments without readily determinable fair values was $32.1 million, consisting of $370 thousand in correspondent bank stock, $1.0 million in CDFI investments, and $30.7 million in CRA investments.

Securities Available for Sale

Securities Available for Sale	9 Months Ended
	Sep. 30, 2021
Debt Securities, Available-for-sale [Abstract]
Securities Available for Sale	Securities Available for Sale The following is a summary of securities available for sale as of the dates indicated: At September 30, 2021 Amortized Gross Gross Allowance For Fair (Dollars in thousands) Debt securities: U.S. Government agency and U.S. Government sponsored enterprises: Collateralized mortgage obligations $ 1,070,995 $ 6,471 $ (6,278) $ — $ 1,071,188 Mortgage-backed securities: Residential 771,502 2,859 (10,966) — 763,395 Commercial 581,316 13,412 (3,067) — 591,661 Asset-backed securities 118,566 98 (61) — 118,603 Corporate securities 23,410 71 (903) — 22,578 Municipal securities 100,573 1,803 (312) — 102,064 Total investment securities available for sale $ 2,666,362 $ 24,714 $ (21,587) $ — $ 2,669,489 At December 31, 2020 Amortized Gross Gross Allowance For Fair (Dollars in thousands) Debt securities: U.S. Government agency and U.S. Government sponsored enterprises: Collateralized mortgage obligations $ 990,679 $ 11,482 $ (844) $ — $ 1,001,317 Mortgage-backed securities: Residential 672,667 8,460 (114) — 681,013 Commercial 482,874 25,026 (21) — 507,879 Corporate securities 7,000 15 (881) — 6,134 Municipal securities 86,213 3,058 (3) — 89,268 Total investment securities available for sale $ 2,239,433 $ 48,041 $ (1,863) $ — $ 2,285,611 As of September 30, 2021 and December 31, 2020, there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of stockholders’ equity. During the three and nine months ended September 30, 2021, the Company had no sales of securities and recognized zero net gains on sales and calls of securities available for sale. During the three and nine months ended September 30, 2020, the Company recognized $7.5 million in net gains on sales of securities available for sale. For the three and nine months ended September 30, 2020, the Company received proceeds from sale of $168.1 million of securities available for sale, which consisted of $34.6 million commercial mortgage-backed securities, $113.3 million residential mortgage-backed securities and $20.2 million collateralized mortgage obligations. At September 30, 2021 and December 31, 2020, $2.8 million and $33.2 million in unrealized gains on securities available for sale net of taxes, respectively, were included in accumulated other comprehensive income. For the three and nine months ended September 30, 2021, there were no reclassifications out of accumulated other comprehensive income into earnings. For the three and nine months ended September 30, 2020, $7.5 million was reclassified out of accumulated other comprehensive income into earnings as gain on sales of investments securities available for sale. The amortized cost and estimated fair value of investment securities at September 30, 2021, by contractual maturity, is presented in the table below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations, with or without call or prepayment penalties. Collateralized mortgage obligations, mortgage-backed securities, and asset-backed securities are not due at a single maturity date and their total balances are shown separately. Amortized Estimated (Dollars in thousands) Available for sale: Due within one year $ — $ — Due after one year through five years 2,000 2,029 Due after five years through ten years 40,085 40,266 Due after ten years 81,898 82,347 U.S. Government agency and U.S. Government sponsored enterprises: Collateralized mortgage obligations 1,070,995 1,071,188 Mortgage-backed securities: Residential 771,502 763,395 Commercial 581,316 591,661 Asset-backed securities 118,566 118,603 Total $ 2,666,362 $ 2,669,489 Securities with carrying values of approximately $393.7 million and $376.1 million at September 30, 2021 and December 31, 2020, respectively, were pledged to secure public deposits, for various borrowings, and for other purposes as required or permitted by law. The following tables show the Company’s investments’ gross unrealized losses and estimated fair values, aggregated by investment category and the length of time that the individual securities have been in a continuous unrealized loss position as of the dates indicated. As of September 30, 2021 Less than 12 months 12 months or longer Total Description of Number Fair Gross Number Fair Gross Number Fair Gross (Dollars in thousands) Collateralized mortgage obligations* 32 $ 690,334 $ (6,278) — $ — $ — 32 $ 690,334 $ (6,278) Mortgage-backed securities: Residential* 60 667,345 (10,966) — — — 60 667,345 (10,966) Commercial* 21 207,216 (3,067) — — — 21 207,216 (3,067) Asset-backed securities 5 44,487 (61) — — — 5 44,487 (61) Corporate securities 4 14,115 (295) 1 4,393 (608) 5 18,508 (903) Municipal securities 12 17,832 (312) — — — 12 17,832 (312) Total 134 $ 1,641,329 $ (20,979) 1 $ 4,393 $ (608) 135 $ 1,645,722 $ (21,587) __________________________________ * Investments in U.S. Government agency and U.S. Government sponsored enterprises As of December 31, 2020 Less than 12 months 12 months or longer Total Description of Number Fair Gross Number Fair Gross Number Fair Gross (Dollars in thousands) Collateralized mortgage obligations* 22 $ 312,757 $ (844) — $ — $ — 22 $ 312,757 $ (844) Mortgage-backed securities: Residential* 8 46,094 (114) — — — 8 46,094 (114) Commercial* 1 10,275 (21) — — — 1 10,275 (21) Corporate securities — — — 1 4,119 (881) 1 4,119 (881) Municipal securities 1 997 (3) — — — 1 997 (3) Total 32 $ 370,123 $ (982) 1 $ 4,119 $ (881) 33 $ 374,242 $ (1,863) __________________________________ * Investments in U.S. Government agency and U.S. Government sponsored enterprises The Company had one corporate security that was in a continuous unrealized loss position for twelve months or longer with a fair value of $4.4 million as of September 30, 2021. With the adoption of CECL, the length of time that the fair value of investment securities have been less than amortized cost is not considered when assessing for credit impairment. With the adoption of ASU 2016-13 on January 1, 2020, the CECL methodology replaced the other-than-temporary impairment model that previou sly existed. The Company did not have a day 1 allowance impact attributable to its investment securities portfolio and did not have an allowance for credit losses as of September 30, 2021 and December 31, 2020. The Company has elected to exclude accrued interest from the amortized cost of its investment securities available for sale. Accrued interest receivable for investment securities available for sale at September 30, 2021 and December 31, 2020 totaled $5.2 million and $4.7 million, respectively. The Company evaluates securities in unrealized loss positions for impairment related to credit losses on at least a quarterly basis. Securities in unrealized loss positions are first assessed as to whether we intend to sell, or if it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis. If one of the criteria is met, the security’s amortized cost basis is written down to fair value through current earnings. For securities that do not meet these criteria, the Company evaluates whether the decline in fair value resulted from credit losses or other factors. In evaluating whether a credit loss exists, the Company has set up an initial filter for impairment triggers. Once the quantitative filters have been triggered, the securities are placed on a watch list and an additional assessment is performed to identify whether a credit impairment exists. In making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, and adverse conditions specifically related to the security and the issuer, among other factors. If this assessment indicates that a credit loss exists, we compare the present value of cash flows expected to be collected from the security with the amortized cost basis. If the present value of cash flows expected to be collected is less than the amortized cost basis for the security, a credit loss exists and an allowance for credit losses is recorded, limited to the amount that the fair value of the security is less than its amortized cost basis. Unrealized losses that have not been recorded through an allowance for credit losses is recognized in other comprehensive income, net of applicable taxes. No allowance for credit losses for available for sale securities was recorded at September 30, 2021. Approximately 91% of the Company’s investment portfolio at September 30, 2021 consisted of securities that were issued by U.S. Government agency and U.S. Government sponsored enterprises. Although a government guarantee exists on these investments, these entities are not legally backed by the full faith and credit of the federal government, and the current support they receive is subject to a cap as part of the agreement entered into in 2008. Nonetheless, at this time we do not foresee any set of circumstances in which the government would not fund its commitments on these investments as the issuers are an integral part of the U.S. housing market in providing liquidity and stability. Therefore, we concluded that a zero allowance approach for these investment securities is appropriate. The Company also had five asset-backed securities, five corporate securities, and twelve municipal bonds in unrealized loss positions at September 30, 2021. The Company performed an assessment of investment securities in unrealized loss positions for credit impairment and concluded that no allowance for credit losses was required at September 30, 2021.

Loans Receivable and Allowance

Loans Receivable and Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Loans Receivable and Allowance for Credit Losses	Loans Receivable and Allowance for Credit Losses The following is a summary of loans receivable by major category: September 30, 2021 December 31, 2020 Loan portfolio composition (Dollars in thousands) Real estate loans: Residential $ 60,051 $ 54,795 Commercial 8,602,519 8,425,959 Construction 246,087 291,380 Total real estate loans 8,908,657 8,772,134 Commercial business * 3,857,879 4,157,787 Residential mortgage 599,781 582,232 Consumer and other 52,374 51,060 Loans receivable 13,418,691 13,563,213 Allowance for credit losses (136,774) (206,741) Loans receivable, net of allowance for credit losses $ 13,281,917 $ 13,356,472 __________________________________ * Commercial business loans as of September 30, 2021 and December 31, 2020 include $336.6 million and $452.7 million, respectively, in SBA Paycheck Protection Program loans Loans receivable is stated at the amount of unpaid principal, adjusted for net deferred fees and costs, premiums and discounts, purchase accounting fair value adjustments, and allowance for credit losses. The Company had net deferred fees of $8.5 million and $3.6 million at September 30, 2021 and December 31, 2020, respectively. Net loan fees related to SBA Paycheck Protection Program (“PPP”) loans totaled $11.2 million at September 30, 2021 compared to $6.4 million at December 31, 2020 and included fees from the origination of SBA PPP loans net of deferred origination costs. The increase in deferred fees for SBA PPP loans was primarily due to the origination of $324.5 million in second round SBA PPP loans during the nine months ended September 30, 2021. The loan portfolio consists of four segments: real estate, commercial business, residential mortgage, and consumer and other loans. Real estate loans are extended for the purchase and refinance of commercial real estate and are generally secured by first deeds of trust and are collateralized by residential or commercial properties. Commercial business loans are loans provided to businesses for various purposes such as for working capital, purchasing inventory, debt refinancing, business acquisitions, international trade finance activities, and other business related financing needs and also include warehouse lines of credit and SBA PPP loans. Residential mortgage loans are extended for personal, family, or household use and are secured by a mortgage or deed of trust. Consumer and other loans consist of home equity, credit card, and other personal loans. Loans receivable declined $144.5 million from December 31, 2020 to $13.42 billion as of September 30, 2021. The decline in loans receivable during the nine months ended September 30, 2021 was largely impacted by a $344.4 million decline in warehouse lines of credit, offset by an increase in multifamily commercial real estate loans of $172.7 million during the same period. During the nine months ended September 30, 2021, the Company sold $148.9 million as part of its strategic plan to improve the credit quality of the loan portfolio. The Company also purchased $215.0 million in adjustable rate mortgages during the nine months ended September 30, 2021. The Company had $179.1 million in loans held for sale as of September 30, 2021 compared to $17.7 million at December 31, 2020. Loans held for sale at September 30, 2021 included $131.2 million in loans rated substandard which were transferred from loans receivable during the three months ended September 30, 2021. These loans are expected to be sold during the fourth quarter of 2021. The tables below details the activity in the allowance for credit losses by portfolio segment for the three and nine months ended September 30, 2021 and 2020. Charge offs for the three and nine months ended September 30, 2021 included $2.9 million and $14.7 million, respectively, in loan charge offs that resulted from the strategic sale of loans with elevated credit risk. There were no such sales for the three and nine months ended September 30, 2020. Charge offs for the three and nine months ended September 30, 2021 also included $10.7 million in charge offs of criticized loans that were transferred to loans held for sale during the third quarter of 2021. Accrued interest receivables on loans totaled $41.8 million at September 30, 2021 and $54.6 million at December 31, 2020. The Company set aside an allowance on loan accrued interest receivables of $320 thousand at September 30, 2021 and $1.0 million at December 31, 2020. Real Estate Commercial Business Residential Mortgage Consumer and Other Total (Dollars in thousands) Three Months Ended September 30, 2021 Balance, beginning of period $ 155,253 $ 29,500 $ 3,612 $ 1,087 $ 189,452 Provision (credit) for credit losses (9,142) (1,011) — 153 (10,000) Loans charged off (41,655) (1,895) (923) (110) (44,583) Recoveries of charge offs 1,113 778 — 14 1,905 Balance, end of period $ 105,569 $ 27,372 $ 2,689 $ 1,144 $ 136,774 Nine Months Ended September 30, 2021 Balance, beginning of period $ 162,196 $ 39,155 $ 4,227 $ 1,163 $ 206,741 Provision (credit) for credit losses (2,570) (10,565) (615) 50 (13,700) Loans charged off (56,645) (3,077) (923) (251) (60,896) Recoveries of charge offs 2,588 1,859 — 182 4,629 Balance, end of period $ 105,569 $ 27,372 $ 2,689 $ 1,144 $ 136,774 Real Estate Commercial Business Residential Mortgage Consumer and Other Total (Dollars in thousands) Three Months Ended September 30, 2020 Balance, beginning of period $ 119,030 $ 35,493 $ 5,868 $ 1,380 $ 161,771 Provision (credit) for credit losses 15,748 7,265 (1,169) 156 22,000 Loans charged off (5,313) (800) — (237) (6,350) Recoveries of charge offs 159 2,251 — 18 2,428 Balance, end of period $ 129,624 $ 44,209 $ 4,699 $ 1,317 $ 179,849 Nine Months Ended September 30, 2020 Balance, beginning of period $ 53,593 $ 33,032 $ 5,925 $ 1,594 $ 94,144 CECL day 1 adoption 27,791 (1,022) (543) (26) 26,200 Provision (credit) for credit losses 55,773 11,663 (683) 747 67,500 Loans charged off (7,884) (4,294) — (1,033) (13,211) Recoveries of charge offs 351 4,830 — 35 5,216 Balance, end of period $ 129,624 $ 44,209 $ 4,699 $ 1,317 $ 179,849 The following tables break out the allowance for credit losses and loan balance by measurement methodology at September 30, 2021 and December 31, 2020: September 30, 2021 Real Estate Commercial Business Residential Mortgage Consumer and Other Total (Dollars in thousands) Allowance for credit losses: Individually evaluated $ 3,025 $ 3,376 $ 9 $ 27 $ 6,437 Collectively evaluated 102,544 23,996 2,680 1,117 130,337 Total $ 105,569 $ 27,372 $ 2,689 $ 1,144 $ 136,774 Loans outstanding: Individually evaluated $ 72,776 $ 19,660 $ 1,599 $ 261 $ 94,296 Collectively evaluated 8,835,881 3,838,219 598,182 52,113 13,324,395 Total $ 8,908,657 $ 3,857,879 $ 599,781 $ 52,374 $ 13,418,691 December 31, 2020 Real Estate Commercial Business Residential Mortgage Consumer and Other Total (Dollars in thousands) Allowance for credit losses: Individually evaluated $ 3,683 $ 3,575 $ 25 $ 42 $ 7,325 Collectively evaluated 158,513 35,580 4,202 1,121 199,416 Total $ 162,196 $ 39,155 $ 4,227 $ 1,163 $ 206,741 Loans outstanding: Individually evaluated $ 93,476 $ 25,706 $ 3,416 $ 605 $ 123,203 Collectively evaluated 8,678,658 4,132,081 578,816 50,455 13,440,010 Total $ 8,772,134 $ 4,157,787 $ 582,232 $ 51,060 $ 13,563,213 As of September 30, 2021 and December 31, 2020, reserves for unfunded loan commitments recorded in other liabilities were $1.4 million and $1.3 million, respectively. For the three and nine months ended September 30, 2021, the Company recorded additions to reserves for unfunded commitments recorded in credit related expenses totaling $0 and $105 thousand, respectively. For the three and nine months ended September 30, 2020, the Company recorded additions to reserves for unfunded commitments recorded in credit related expenses totaling $0 and $660 thousand, respectively. Generally, loans are placed on nonaccrual status if principal and/or interest payments become 90 days or more past due and/or management deems the collectability of the principal and/or interest to be in question, as well as when required by regulatory requirements. Loans to customers whose financial conditions have deteriorated are considered for nonaccrual status whether or not the loan is 90 days or more past due. Generally, payments received on nonaccrual loans are recorded as principal reductions. Loans are returned to accrual status only when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. The Company does not recognize interest income while loans are on nonaccrual status. The tables below represent the recorded investment of nonaccrual loans and loans past due 90 or more days and still on accrual status by class of loans and broken out by loans with a recorded ACL and those without a recorded ACL as of September 30, 2021 and December 31, 2020. September 30, 2021 Nonaccrual with No ACL Nonaccrual with an ACL Total Nonaccrual (1) Accruing Loans Past Due 90 or More Days (Dollars in thousands) Real estate – residential $ — $ — $ — $ — Real estate – commercial Retail 4,542 2,831 7,373 — Hotel & motel 4,241 9,576 13,817 — Gas station & car wash 575 1,433 2,008 — Mixed use — 6,954 6,954 1,704 Industrial & warehouse 2,013 2,314 4,327 — Other 888 6,306 7,194 1,889 Real estate – construction — — — — Commercial business 4,951 6,040 10,991 500 Residential mortgage — 1,599 1,599 392 Consumer and other — 117 117 82 Total $ 17,210 $ 37,170 $ 54,380 $ 4,567 December 31, 2020 Nonaccrual with No ACL Nonaccrual with an ACL Total Nonaccrual (1) Accruing Loans Past Due 90 or More Days (Dollars in thousands) Real estate – residential $ — $ — $ — $ — Real estate – commercial Retail 3,262 8,530 11,792 478 Hotel & motel 15,311 2,195 17,506 — Gas station & car wash 151 1,493 1,644 — Mixed use 1,883 788 2,671 — Industrial & warehouse 5,443 1,022 6,465 — Other 7,230 1,419 8,649 — Real estate – construction — 18,723 18,723 — Commercial business 5,319 8,592 13,911 — Residential mortgage 1,440 1,976 3,416 — Consumer and other — 461 461 136 Total $ 40,039 $ 45,199 $ 85,238 $ 614 __________________________________ (1) Total nonaccrual loans exclude the guaranteed portion of SBA loans that are in liquidation totaling $20.6 million and $26.5 million, at September 30, 2021 and December 31, 2020, respectively. The following table presents the amortized cost basis of collateral-dependent loans as of September 30, 2021 and December 31, 2020: September 30, 2021 Real Estate Collateral Other Collateral Total (Dollars in thousands) Real estate – residential $ — $ — $ — Real estate – commercial 44,061 — 44,061 Real estate – construction — — — Commercial business 1,992 6,463 8,455 Residential mortgage — — — Consumer and other — — — Total $ 46,053 $ 6,463 $ 52,516 December 31, 2020 Real Estate Collateral Other Collateral Total (Dollars in thousands) Real estate – residential $ — $ — $ — Real estate – commercial 55,945 — 55,945 Real estate – construction 8,122 — 8,122 Commercial business 7,818 6,312 14,130 Residential mortgage 1,440 — 1,440 Consumer and other 15 — 15 Total $ 73,340 $ 6,312 $ 79,652 Interest income reversals due to loans being placed on nonaccrual status were $1.1 million and $76 thousand for the three months ended September 30, 2021 and 2020, respectively. Nonaccrual interest income reversals for the nine months ended September 30, 2021 and 2020 were $2.8 million and $611 thousand, respectively. The following table presents the recorded investment of past due loans, including nonaccrual loans past due 30 or more days, by the number of days past due as of September 30, 2021 and December 31, 2020 by class of loans: As of September 30, 2021 As of December 31, 2020 30-59 Days 60-89 Days 90 or More Days Total 30-59 Days 60-89 Days 90 or More Days Total (Dollars in thousands) Real estate – residential $ — $ — $ — $ — $ — $ — $ — $ — Real estate – commercial Retail 2,364 3,354 4,336 10,054 852 8,141 10,276 19,269 Hotel & motel 425 1,522 9,615 11,562 62 1,401 14,744 16,207 Gas station & car wash — — 607 607 619 2,668 563 3,850 Mixed use 1,037 5,307 2,225 8,569 116 — 1,269 1,385 Industrial & warehouse 145 2,110 2,453 4,708 137 — 3,830 3,967 Other 2,034 1,235 3,838 7,107 2,738 545 3,000 6,283 Real estate – construction — — — — 8,122 — — 8,122 Commercial business 9,241 233 8,411 17,885 816 3,683 4,700 9,199 Residential mortgage 195 — 1,322 1,517 4,841 — 2,263 7,104 Consumer and other 28 15 82 125 797 21 595 1,413 Total Past Due $ 15,469 $ 13,776 $ 32,889 $ 62,134 $ 19,100 $ 16,459 $ 41,240 $ 76,799 The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt, including, but not limited to, current financial information, historical payment experience, credit documentation, public information, and current economic trends. Homogeneous loans (i.e., home mortgage loans, home equity lines of credit, overdraft loans, express business loans, and automobile loans) are not risk rated and credit risk is analyzed largely by the number of days past due. This analysis is performed at least on a quarterly basis. The definitions for risk ratings are as follows: • Pass: Loans that meet a preponderance or more of the Company’s underwriting criteria and evidence an acceptable level of risk. • Special Mention: Loans that have potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date. • Substandard: Loans that are inadequately protected by the current net worth and paying capacity of the borrower or by the collateral pledged, if any. Loans in this classification have a well-defined weakness or weaknesses that jeopardize the repayment of the debt. They are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. • Doubtful: Loans that have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or repayment in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. In 2021, the Company completed the sale of $148.9 million in loans, most of which had elevated credit risk or were likely to exhibit credit issues in the future. Of the loans with elevated credit risk sold, $68.4 million were rated as special mention and $56.2 million were rated as substandard. The following table presents the amortized cost basis of loans receivable by class, credit quality indicator, and year of origination as of September 30, 2021 and December 31, 2020. As of September 30, 2021 Term Loan by Origination Year Revolving Loans Total 2021 2020 2019 2018 2017 Prior (Dollars in thousands) Real Estate - Residential Pass / not rated $ 16,184 $ 11,789 $ 11,747 $ 5,514 $ 3,796 $ 8,017 $ 2,281 $ 59,328 Special mention — — — — — 361 228 589 Substandard — — — 134 — — — 134 Doubtful / loss — — — — — — — — Subtotal $ 16,184 $ 11,789 $ 11,747 $ 5,648 $ 3,796 $ 8,378 $ 2,509 $ 60,051 Real Estate - Commercial Pass / not rated $ 1,738,636 $ 1,452,247 $ 1,280,364 $ 1,318,119 $ 965,008 $ 1,314,555 $ 101,893 $ 8,170,822 Special mention 6,357 8,263 49,900 19,138 46,715 79,561 5,971 215,905 Substandard 6,479 877 15,852 29,462 43,805 119,317 — 215,792 Doubtful / loss — — — — — — — — Subtotal $ 1,751,472 $ 1,461,387 $ 1,346,116 $ 1,366,719 $ 1,055,528 $ 1,513,433 $ 107,864 $ 8,602,519 Real Estate - Construction Pass / not rated $ 7,048 $ 59,503 $ 29,414 $ 40,788 $ 25,912 $ 15,983 $ 10,794 $ 189,442 Special mention — — — 45,950 4,708 5,987 — 56,645 Substandard — — — — — — — — Doubtful / loss — — — — — — — — Subtotal $ 7,048 $ 59,503 $ 29,414 $ 86,738 $ 30,620 $ 21,970 $ 10,794 $ 246,087 Commercial Business Pass / not rated $ 1,193,990 $ 545,116 $ 452,416 $ 138,691 $ 75,851 $ 82,834 $ 1,309,437 $ 3,798,335 Special mention 1,134 401 13,667 1,469 3,242 10,343 3,371 33,627 Substandard 1,665 1,150 1,764 1,999 4,818 5,650 8,871 25,917 Doubtful / loss — — — — — — — — Subtotal $ 1,196,789 $ 546,667 $ 467,847 $ 142,159 $ 83,911 $ 98,827 $ 1,321,679 $ 3,857,879 Residential Mortgage Pass / not rated $ 253,561 $ 3,824 $ 45,251 $ 140,682 $ 95,657 $ 59,206 $ — $ 598,181 Special mention — — — — — — — — Substandard — — 128 195 541 736 — 1,600 Doubtful / loss — — — — — — — — Subtotal $ 253,561 $ 3,824 $ 45,379 $ 140,877 $ 96,198 $ 59,942 $ — $ 599,781 Consumer and Other Pass / not rated $ 12,153 $ 5,671 $ 1,868 $ 1,670 $ 1,901 $ 7,512 $ 21,358 $ 52,133 Special mention — — — — — — — — Substandard — — — — — 241 — 241 Doubtful / loss — — — — — — — — Subtotal $ 12,153 $ 5,671 $ 1,868 $ 1,670 $ 1,901 $ 7,753 $ 21,358 $ 52,374 Total Loans Pass / not rated $ 3,221,572 $ 2,078,150 $ 1,821,060 $ 1,645,464 $ 1,168,125 $ 1,488,107 $ 1,445,763 $ 12,868,241 Special mention 7,491 8,664 63,567 66,557 54,665 96,252 9,570 306,766 Substandard 8,144 2,027 17,744 31,790 49,164 125,944 8,871 243,684 Doubtful / loss — — — — — — — — Total $ 3,237,207 $ 2,088,841 $ 1,902,371 $ 1,743,811 $ 1,271,954 $ 1,710,303 $ 1,464,204 $ 13,418,691 December 31, 2020 Term Loan by Origination Year Revolving Loans Total 2020 2019 2018 2017 2016 Prior (Dollars in thousands) Real Estate - Residential Pass / not rated $ 15,158 $ 13,924 $ 7,587 $ 4,316 $ 6,800 $ 3,460 $ 3,104 $ 54,349 Special mention — — — — — — 227 227 Substandard — — 139 — — 80 — 219 Doubtful / loss — — — — — — — — Subtotal $ 15,158 $ 13,924 $ 7,726 $ 4,316 $ 6,800 $ 3,540 $ 3,331 $ 54,795 Real Estate - Commercial Pass / not rated $ 1,548,595 $ 1,554,980 $ 1,533,802 $ 1,240,973 $ 767,318 $ 1,262,125 $ 130,595 $ 8,038,388 Special mention — 2,805 24,569 10,694 8,031 32,048 1,600 79,747 Substandard 126 14,233 28,938 37,174 50,371 173,788 3,194 307,824 Doubtful / loss — — — — — — — — Subtotal $ 1,548,721 $ 1,572,018 $ 1,587,309 $ 1,288,841 $ 825,720 $ 1,467,961 $ 135,389 $ 8,425,959 Real Estate - Construction Pass / not rated $ 35,743 $ 45,290 $ 103,794 $ 60,996 $ 5,740 $ 10,099 $ — $ 261,662 Special mention — — — — 5,771 5,224 — 10,995 Substandard — — — 10,601 — 8,122 — 18,723 Doubtful / loss — — — — — — — — Subtotal $ 35,743 $ 45,290 $ 103,794 $ 71,597 $ 11,511 $ 23,445 $ — $ 291,380 Commercial Business Pass / not rated $ 1,294,368 $ 584,453 $ 224,447 $ 117,708 $ 77,209 $ 43,674 $ 1,686,428 $ 4,028,287 Special mention 5,996 27,693 30,852 14,629 6,388 3,139 5,172 93,869 Substandard 2,430 1,323 5,539 4,394 6,158 5,463 10,323 35,630 Doubtful / loss — — 1 — — — — 1 Subtotal $ 1,302,794 $ 613,469 $ 260,839 $ 136,731 $ 89,755 $ 52,276 $ 1,701,923 $ 4,157,787 Residential Mortgage Pass / not rated $ 5,733 $ 90,958 $ 217,343 $ 168,827 $ 55,246 $ 40,554 $ — $ 578,661 Special mention — — — — — — — — Substandard — 122 536 561 1,715 637 — 3,571 Doubtful / loss — — — — — — — — Subtotal $ 5,733 $ 91,080 $ 217,879 $ 169,388 $ 56,961 $ 41,191 $ — $ 582,232 Consumer and Other Pass / not rated $ 8,309 $ 2,463 $ 1,818 $ 2,321 $ 4,756 $ 2,811 $ 27,890 $ 50,368 Special mention — — — 103 — — — 103 Substandard — — — — 55 532 2 589 Doubtful / loss — — — — — — — — Subtotal $ 8,309 $ 2,463 $ 1,818 $ 2,424 $ 4,811 $ 3,343 $ 27,892 $ 51,060 Total Loans Pass / not rated $ 2,907,906 $ 2,292,068 $ 2,088,791 $ 1,595,141 $ 917,069 $ 1,362,723 $ 1,848,017 $ 13,011,715 Special mention 5,996 30,498 55,421 25,426 20,190 40,411 6,999 184,941 Substandard 2,556 15,678 35,152 52,730 58,299 188,622 13,519 366,556 Doubtful / loss — — 1 — — — — 1 Total $ 2,916,458 $ 2,338,244 $ 2,179,365 $ 1,673,297 $ 995,558 $ 1,591,756 $ 1,868,535 $ 13,563,213 For the three and nine months ended September 30, 2021 and the twelve months ended December 31, 2020, there were no revolving loans converted to term loans. The Company may reclassify loans held for investment to loans held for sale in the event that the Company plans to sell loans that were originated with the intent to hold to maturity. Loans transferred from held for investment to held for sale are carried at the lower of cost or fair value. The breakdown of loans by type that were reclassified from held for investment to held for sale for the three and nine months ended September 30, 2021 and 2020 is presented in the following table: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Transfer of loans held for investment to held for sale (Dollars in thousands) Real estate - commercial $ 107,191 $ — $ 278,366 $ — Commercial business 78,990 — 88,650 — Residential mortgage 7,018 — 7,018 1,002 Total $ 193,199 $ — $ 374,034 $ 1,002 On January 1, 2020 the Company adopted ASU 2016-13, “Measurement of Credit Losses on Financial Instruments”, or CECL. The Company calculates its ACL by estimating expected credit losses on a collective basis for loans that share similar risk characteristics. Loans that do not share similar risk characteristics with other loans are evaluated for credit losses on an individual basis. The Company uses a combination of a modeled and non-modeled approach that incorporates current and future economic conditions to estimate lifetime expected losses on a collective basis. The Company uses Probability of Default (“PD”), Loss Given Default (“LGD”), and Exposure at Default (“EAD”) methodologies with quantitative factors and qualitative considerations in calculation of the allowance for credit losses for collectively assessed loans. The Company uses a reasonable and supportable period of 2 years at which point loss assumptions revert back to historical loss information by means of 1 year reversion period. The ACL for the Company’s construction, credit card, and certain consumer loans is calculated based on a non-modeled approach utilizing historical loss rates to estimate losses. A non-modeled approach was chosen for these loans as fewer data points exist which could result in high levels of estimated loss volatility under a modeled approach. In aggregate, non-modeled loans represented less than 3% of the Company’s total loan portfolio as of September 30, 2021. The Company’s Economic Forecast Committee (“EFC”) reviews economic forecast scenarios that are incorporated in the Company’s ACL. The EFC reviews multiple scenarios provided to the Company by an independent third party and chooses a single scenario that best aligns with management’s expectation of future economic conditions. The forecast scenario contains certain macroeconomic variables that are incorporated into the Company’s modeling process, including GDP, unemployment rates, interest rates, and commercial real estate prices. As of September 30, 2021, the Company chose a forecast scenario that incorporates the effect of the COVID-19 pandemic and the expected economic recovery into estimates of future economic conditions. The forecast improved compared to forecasts used during the second quarter of 2021 with an overall increase in projected GDP growth and projected commercial real estate prices. The improvement to the economic forecasts reflect the current and projected effects of government stimulus packages, ongoing COVID-19 vaccinations, and the reopening of many businesses throughout the United States. Additionally, in order to systematically quantify the credit risk impact of other trends and changes within the loan portfolio, the Company utilizes qualitative adjustments to the modeled and non-modeled estimated loss approaches. The parameters for making adjustments are established under a Credit Risk Matrix that provides different possible scenarios for each of the factors below. The Credit Risk Matrix and the possible scenarios enable the Bank to qualitatively adjust the Loss Migration Ratio by as much as 25 basis points for each loan type pool. This matrix considers the following seven factors, which are patterned after the guidelines provided under the Federal Financial Institutions Examination Council (“FFIEC”) Interagency Policy Statement on the Allowance for Loan and Lease Losses, updated to reflect the adoption of CECL: • Changes in lending policies and procedures, including underwriting standards and collection, charge off, and recovery practices; • Changes in the nature and volume of the loan portfolio; • Changes in the experience, ability, and depth of lending management and staff; • Changes in the trends of the volume and severity of past due loans, classified loans, nonaccrual loans, troubled debt restructurings, and other loan modifications; • Changes in the quality of the loan review system and the degree of oversight by the Directors; • The existence and effect of any concentrations of credit and changes in the level of such concentrations; and • The effect of external factors, such as competition, legal requirements, and regulatory requirements on the level of estimated losses in the loan portfolio. For loans which do not share similar risk characteristics such as nonaccrual and TDR loans above $500 thousand, the Company evaluates these loans on an individual basis in accordance with ASC 326. These nonaccrual and TDR loans are considered to have different risk profiles than performing loans and therefore are evaluated separately. The Company decided to collectively assess TDRs and nonaccrual loans with balances below $500 thousand along with the performing and accrual loans in order to reduce the operational burden of individually assessing small TDR and nonaccrual loans with immaterial balances. For individually assessed loans, the ACL is measured using either 1) the present value of future cash flows discounted at the loan’s effective interest rate; 2) the loan’s observable market price; or 3) the fair value of the collateral, if the loan is collateral dependent. For the collateral dependent loans, the Company obtains a new appraisal to determine the fair value of collateral. The appraisals are based on an “as-is” valuation. To ensure that appraised values remain current, the Company either obtains updated appraisals every twelve months from a qualified independent appraiser or an internal evaluation of the collateral is performed by qualified personnel. If the third party market data indicates that the value of the collateral property has declined since the most recent valuation date, management adjusts the value of the property downward to reflect current market conditions. If the fair value of the collateral is less than the amortized balance of the loan, the Company recognizes an ACL with a corresponding charge to the provision for credit losses. The Company maintains a separate ACL for its off-balance sheet unfunded loan commitments. The Company uses a funding rate to allocate the allowance to undrawn exposures. This funding rate is used as a credit conversion factor to capture how much undrawn lines of credit can potentially become drawn at any point. The funding rate is determined based on a lookback period of 8 quarters. Credit loss is not estimated for off-balance sheet credit exposures that are unconditionally cancellable by the Company. The following tables present a breakdown of loans by recorded ACL, broken out by loans evaluated individually and collectively at September 30, 2021 and December 31, 2020: As of September 30, 2021 Real Estate – Real Estate – Real Estate – Commercial Residential Consumer Total (Dollars in thousands) Individually evaluated loans $ — $ 72,776 $ — $ 19,660 $ 1,599 $ 261 $ 94,296 ACL on individually evaluated loans $ — $ 3,025 $ — $ 3,376 $ 9 $ 27 $ 6,437 Individually evaluated loans ACL coverage N/A 4.16 % N/A 17.17 % 0.56 % 10.34 % 6.83 % Collectively evaluated loans $ 60,051 $ 8,529,743 $ 246,087 $ 3,838,219 $ 598,182 $ 52,113 $ 13,324,395 ACL on collectively evaluated loans $ 371 $ 100,536 $ 1,637 $ 23,996 $ 2,680 $ 1,117 $ 130,337 Collectively evaluated loans ACL coverage 0.62 % 1.18 % 0.67 % 0.63 % 0.45 % 2.14 % 0.98 % Total loans $ 60,051 $ 8,602,519 $ 246,087 $ 3,857,879 $ 599,781 $ 52,374 $ 13,418,691 Total ACL $ 371 $ 103,561 $ 1,637 $ 27,372 $ 2,689 $ 1,144 $ 136,774 Total ACL to total loans 0.62 % 1.20 % 0.67 % 0.71 % 0.45 % 2.18 % 1.02 % As of December 31, 2020 Real Estate – Real Estate – Real Estate – Commercial Residential Consumer Total (Dollars in thousands) Individually evaluated loans $ — $ 74,753 $ 18,723 $ 25,706 $ 3,416 $ 605 $ 123,203 ACL on individually evaluated loans $ — $ 2,862 $ 821 $ 3,575 $ 25 $ 42 $ 7,325 Individually evaluated loans ACL coverage N/A 3.83 % 4.38 % 13.91 % 0.73 % 6.94 % 5.95 % Collectively evaluated loans $ 54,795 $ 8,351,206 $ 272,657 $ 4,132,081 $ 578,816 $ 50,455 $ 13,440,010 ACL on collectively evaluated loans $ 391 $ 156,665 $ 1,457 $ 35,580 $ 4,202 $ 1,121 $ 199,416 Collectively evaluated loans ACL coverage 0.71 % 1.88 % 0.53 % 0.86 % 0.73 % 2.22 % 1.48 % Total loans $ 54,795 $ 8,425,959 $ 291,380 $ 4,157,787 $ 582,232 $ 51,060 $ 13,563,213 Total ACL $ 391 $ 159,527 $ 2,278 $ 39,155 $ 4,227 $ 1,163 $ 206,741 Total ACL to total loans 0.71 % 1.89 % 0.78 % 0.94 % 0.73 % 2.28 % 1.52 % Under certain circumstances, the Company provides borrowers relief through loan modifications. These modifications are either temporary in nature (“temporary modifications”) or are more substantive. The temporary modifications generally consist of interest only payments for a three six TDR loans are individually evaluated in accordance with ASC 310 and ASC 326. The concessions may be granted in various forms, including reduction in the stated interest rate, reduction in the amount of principal amortization, forgiveness of a portion of a loan balance or accrued interest, or extension of the maturity date. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed on the probability that the borrower will be in payment default on their debt in the foreseeable future without the modification. This evaluation is performed under the Bank’s internal underwriting policy. At September 30, 2021, total TDR loans were $54.4 million, compared to $51.6 million at December 31, 2020. The balance of loans with modified terms due to COVID-19 as of September 30, 2021 totaled $122.0 million. The majority of these loans were modified in accordance with Section 4013 of the CARES Act. The CARES Act provides banks the option to temporarily suspend certain requirements under U.S. GAAP related to TDR for a limited period of time to account for the effects of COVID-19 if (i) the loan modification is made between March 1, 2020 and the earlier of January 1, 2022 or 60 days after the end of the coronavirus emergency declaration and (ii) the applicable loan was not more than 30 days past due as of December 31, 2019. As such, all modified loans that met the criteria outlined within Section 4013 of the CARES Act were not classified as TDR loans as of September 30, 2021 and December 31, 2020, unless the loans were TDR prior to the COVID-19 modification or borrowers were identified to be experiencing financial difficulty prior to the COVID-19 pandemic. As of September 30, 2021, real estate loans accounted for approximately 95% of the loans modified due to hardship from the COVID-19 pandemic. The modifications consisted of full payment deferrals, interest only payments, and a hybrid of full payment deferrals for a period of time followed by interest only payments (see “COVID-19 Related Loan Modifications” in the Financial Condition section of the Management’s Discussion and Analysis of Financial Condition and Results of Operations for more information). A summary of the recorded investment of TDR loans on accrual and nonaccrual status by type of concession as of September 30, 2021 and December 31, 2020 is presented below: As of September 30, 2021 TDR Loans on Accrual Status TDR Loans on Nonaccrual Status Total TDRs Real Estate Commercial Business Residential Mortgage Other Real Estate Commercial Business Residential Mortgage Other (Dollars in thousands) Payment concession $ 8,034 $ 808 $ — $ 55 $ 9,145 $ 473 $ — $ — $ 18,515 Maturity / amortization concession 17,567 7,275 — 158 285 3,257 — 117 28,659 Rate concession 5,254 358 — — 244 1,417 — — 7,273 Total $ 30,855 $ 8,441 $ — $ 213 $ 9,674 $ 5,147 $ — $ 117 $ 54,447 As of December 31, 2020 TDR Loans on Accrual Status TDR Loans on Nonaccrual Status Total Real Estate Commercial Business Residential Mortgage Other Real Estate Commercial Business Residential Mortgage Other (Dollars in thousands) Payment concession $ 8,328 $ 814 $ — $ 58 $ 7,074 $ 471 $ — $ — $ 16,745 Maturity / amortization concession 11,331 10,219 — 114 925 3,814 — 117 26,520 Rate concession 6,112 378 — — 424 1,430 — — 8,344 Total $ 25,771 $ 11,411 $ — $ 172 $ 8

Leases

Leases	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Leases	Leases The Company’s operating leases are real estate leases which are comprised of bank branch locations, loan production offices, and office spaces with remaining lease terms ranging from 1 to 11 years as of September 30, 2021. Certain lease arrangements contain extension options which are typically around 5 years. As these extension options are not generally considered reasonably certain of exercise, they are not included in the lease term. At September 30, 2021, ROU assets and related liabilities were $50.6 million and $55.1 million, respectively. At December 31, 2020, ROU assets and related liabilities were $47.7 million and $52.0 million, respectively. At September 30, 2021, the short term operating lease liability totaled $12.2 million and the long-term operating lease liability totaled $42.9 million. The Company defines short-term operating lease liabilities as liabilities due in twelve months or less and long term lease liabilities are defined as liabilities that are due in more than twelve months at the end of each reporting period. The Company did not have any finance leases at September 30, 2021. During the nine months ended September 30, 2021, the Company extended twelve leases and entered into one new lease contract. Lease extension terms ranged from three Operating lease ROU assets represent the Company’s right to use the underlying asset during the lease term and operating lease liabilities represent the Company’s obligation to make lease payments arising from the lease. ROU assets and operating lease liabilities are recognized at lease commencement based on the present value of the remaining lease payments using the Company’s incremental borrowing rate at the lease commencement date. Operating lease expense, which is comprised of amortization of the ROU asset and the implicit interest accreted on the operating lease liability, is recognized on a straight-line basis over the lease term and is recorded in occupancy expense in the Consolidated Statements of Income. The Company’s occupancy expense also includes variable lease costs which is comprised of the Company's share of actual costs for utilities, common area maintenance, property taxes, and insurance that are not included in lease liabilities and are expensed as incurred. Variable lease costs can also include rent escalations based on changes to indices, such as the Consumer Price Index, where the Company estimates future rent increases and records the actual difference to variable costs. The Company uses its incremental borrowing rate to present value lease payments in order to recognize a ROU asset and the related lease liability. The Company calculates its incremental borrowing rate by adding a spread to the FHLB borrowing interest rate at a given period. The table below summarizes the Company’s net lease cost: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (Dollars in thousands) Operating lease cost $ 3,778 $ 3,928 $ 11,498 $ 11,752 Short term lease cost — — — — Variable lease cost 892 864 2,393 2,403 Sublease income (102) (169) (354) (595) Net lease cost $ 4,568 $ 4,623 $ 13,537 $ 13,560 Rent expense for the three and nine months ended September 30, 2021 was $4.6 million and $13.6 million, respectively. Rent expense for the three and nine months ended September 30, 2020 was $4.6 million and $13.7 million, respectively. The table below summarizes other information related to the Company’s operating leases: At or for the Nine Months Ended At or for the Nine Months Ended (Dollars in thousands) Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows for operating leases $ 10,991 $ 11,320 Right-of-use assets obtained in exchange for lease liabilities, net 965 — Weighted-average remaining lease term - operating leases 5.4 years 5.3 years Weighted-average discount rate - operating leases 2.56 % 2.99 % The table below summarizes the maturity of remaining lease liabilities: September 30, 2021 (Dollars in thousands) 2021 $ 3,694 2022 12,704 2023 10,942 2024 9,335 2025 7,634 2026 and thereafter 14,853 Total lease payments 59,162 Less: imputed interest 4,067 Total lease obligations $ 55,095 As of September 30, 2021, the Company did not have any additional operating lease commitments that have not yet commenced.

Deposits

Deposits	9 Months Ended
	Sep. 30, 2021
Deposits [Abstract]
Deposits	Deposits The aggregate amounts of time deposits in denominations of more than $250 thousand at September 30, 2021 and December 31, 2020, was $1.54 billion and $1.85 billion, respectively. Included in time deposits of more than $250 thousand were $300.0 million in California State Treasurer’s deposits at September 30, 2021 and December 31, 2020. The California State Treasurer’s deposits are subject to withdrawal based on the State’s periodic evaluations. The Company is required to pledge eligible collateral of at least 110% of outstanding deposits. At September 30, 2021 and December 31, 2020, securities with fair values of approximately $390.6 million and $368.2 million, respectively, were pledged as collateral for the California State Treasurer’s deposit. The Company also utilizes brokered deposits as a secondary source of funds. Total brokered deposits at September 30, 2021 and December 31, 2020, totaled $375.3 million and $1.14 billion, respectively. Brokered deposits at September 30, 2021 consisted of $375.1 million in money market and NOW accounts and $192 thousand in time deposits accounts. Brokered deposits at December 31, 2020 consisted of $735.0 million in money market and NOW accounts and $400.6 million in time deposit accounts. The following is a breakdown of the Company’s deposits at September 30, 2021 and December 31, 2020: At September 30, 2021 At December 31, 2020 Balance Percentage (%) Balance Percentage (%) (Dollars in thousands) Noninterest bearing demand deposits $ 6,007,586 40 % $ 4,814,254 34 % Money market and NOW accounts 5,871,567 39 % 5,232,413 36 % Saving deposits 314,603 2 % 300,770 2 % Time deposits 2,868,771 19 % 3,986,475 28 % Total deposits $ 15,062,527 100 % $ 14,333,912 100 %

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Borrowings	Borrowings The Company maintains a line of credit with the Federal Home Loan Bank (“FHLB”) of San Francisco as a secondary source of funds. The borrowing capacity with the FHLB is limited to the lower of 25% of the Bank’s total assets or the Bank’s collateral capacity, which was $4.37 billion at September 30, 2021, and $4.18 billion at December 31, 2020. The terms of this credit facility require the Company to pledge eligible collateral with the FHLB equal to at least 100% of outstanding advances. The Company also has an unsecured credit facility with the FHLB that totaled $81.2 million at September 30, 2021 and December 31, 2020. At September 30, 2021 and December 31, 2020, loans with a carrying amount of approximately $6.72 billion and $6.95 billion, respectively, were pledged at the FHLB for outstanding advances and remaining borrowing capacity. At September 30, 2021 and December 31, 2020, other than FHLB stock, no securities were pledged as collateral at the FHLB. The purchase of FHLB stock is a prerequisite to become a member of the FHLB system, and the Company is required to own a certain amount of FHLB stock based on outstanding borrowings. At September 30, 2021 and December 31, 2020, FHLB advances totaled $200.0 million and $250.0 million, respectively, and had weighted average interest rates of 1.27% and 1.07%, respectively. FHLB advances at September 30, 2021 and December 31, 2020 had various maturities through December 2022. The interest rates of FHLB advances as of September 30, 2021 ranged between 0.15% and 2.39%. At September 30, 2021, the Company’s remaining borrowing capacity with the FHLB was $4.15 billion. The Company maintains unsecured borrowing lines with other banks. There were no federal funds purchased from other banks at September 30, 2021 and December 31, 2020. At September 30, 2021, the contractual maturities for outstanding FHLB advances were as follows: September 30, 2021 Scheduled maturities in: (Dollars in thousands) 2021 $ 100,000 2022 100,000 Total $ 200,000 As a member of the Federal Reserve Bank (“FRB”) system, the Bank may also borrow from the FRB of San Francisco. The maximum amount that the Bank may borrow from the FRB’s discount window is up to 99% of the fair market value of the qualifying loans and securities that are pledged. At September 30, 2021, the outstanding principal balance of the qualifying loans pledged at the FRB was $725.0 million and there was one investment security pledged to borrow against the discount window with book value totaling $1.8 million. At September 30, 2021 and December 31, 2020, the total available borrowing capacity at the FRB discount window was $517.0 million and $616.0 million, respectively. There were no borrowings outstanding with the FRB discount window as of September 30, 2021 and December 31, 2020.

Subordinated Debentures and Con

Subordinated Debentures and Convertible Notes	9 Months Ended
	Sep. 30, 2021
Subordinated Borrowings [Abstract]
Subordinated Debentures and Convertible Notes	Subordinated Debentures and Convertible Notes Subordinated Debt At September 30, 2021, the Company had nine wholly owned subsidiary grantor trusts that had issued $126.0 million of pooled trust preferred securities. Trust preferred securities accrue and pay distributions periodically at specified annual rates as provided in the indentures. The trusts used the net proceeds from the offering to purchase a like amount of subordinated debentures (the “Debentures”). The Debentures are the sole assets of the trusts. The Company’s obligations under the subordinated debentures and related documents, taken together, constitute a full and unconditional guarantee by the Company of the obligations of the trusts. The trust preferred securities are mandatorily redeemable upon the maturity of the Debentures, or upon earlier redemption as provided in the indentures. The Company has the right to redeem the Debentures in whole (but not in part) on a quarterly basis at a redemption price specified in the indentures plus any accrued but unpaid interest to the redemption date. The Company also has a right to defer consecutive payments of interest on the debentures for up to five years. The following table is a summary of trust preferred securities and Debentures at September 30, 2021: Issuance Trust Issuance Date Trust Preferred Security Amount Carrying Value of Debentures Rate Type Current Rate Maturity Date (Dollars in thousands) Nara Capital Trust III 06/05/2003 $ 5,000 $ 5,155 Variable 3.266% 06/15/2033 Nara Statutory Trust IV 12/22/2003 5,000 5,155 Variable 2.976% 01/07/2034 Nara Statutory Trust V 12/17/2003 10,000 10,310 Variable 3.070% 12/17/2033 Nara Statutory Trust VI 03/22/2007 8,000 8,248 Variable 1.766% 06/15/2037 Center Capital Trust I 12/30/2003 18,000 14,631 Variable 2.976% 01/07/2034 Wilshire Trust II 03/17/2005 20,000 16,140 Variable 1.910% 03/17/2035 Wilshire Trust III 09/15/2005 15,000 11,471 Variable 1.516% 09/15/2035 Wilshire Trust IV 07/10/2007 25,000 18,555 Variable 1.496% 09/15/2037 Saehan Capital Trust I 03/30/2007 20,000 15,392 Variable 1.752% 06/30/2037 Total $ 126,000 $ 105,057 The carrying value of Debentures at September 30, 2021 and December 31, 2020 was $105.1 million and $104.2 million, respectively. At September 30, 2021 and December 31, 2020, acquired Debentures had remaining discounts of $24.8 million and $25.7 million, respectively. The carrying balance of Debentures is net of remaining discounts and includes common trust securities. The Company’s investment in the common trust securities of the issuer trusts was $3.9 million at September 30, 2021 and December 31, 2020 and is included in other assets. Although the subordinated debt issued by the trusts are not included as a component of stockholders’ equity in the Consolidated Statements of Financial Condition, the debt is treated as capital for regulatory purposes. The Company’s trust preferred security debt issuances (less common trust securities) are includable in Tier 1 capital up to a maximum of 25% of capital on an aggregate basis as they were grandfathered in under BASEL III. Any amount that exceeds 25% qualifies as Tier 2 capital. Convertible Notes In 2018, the Company issued $217.5 million aggregate principal amount of 2.00% convertible senior notes maturing on May 15, 2038 in a private offering to qualified institutional buyers under Rule 144A of the Securities Act of 1933. The convertible notes can be converted into shares of the Company’s common stock at an initial rate of 45.0760 shares per $1,000 principal amount of the notes (equivalent to an initial conversion price of approximately $22.18 per share of common stock which represents a premium of 22.50% to the closing stock price on the date of the pricing of the notes). Holders of the convertible notes have the option to convert all or a portion of the notes at any time on or after February 15, 2023. Prior to February 15, 2023, the convertible notes cannot be converted unless under certain specified scenarios. The convertible notes can be called by the Company, in part or in whole, on or after May 20, 2023 for 100% of the principal amount in cash. Holders of the convertible notes also have the option to put the notes back to the Company on May 15, 2023, May 15, 2028, or May 15, 2033 for 100% of the principal amount in cash. The convertible notes can be settled in cash, stock, or a combination of stock and cash at the option of the Company. The convertible notes issued by the Company were initially separated into a debt component and an equity component which represents the stock conversion option. The present value of the convertible notes was calculated based on a discount rate of 4.25%, which represented the current offering rate for similar types of debt without conversion options. The difference between the principal amount of the notes and the present value was recorded as the convertible note discount and additional paid-in capital. The issuance costs related to the offering were also allocated into a debt component to be capitalized, and an equity component in the same percentage allocation of debt and equity of the convertible note. On January 1, 2021, the Company early adopted ASU 2020-06 and under the modified retrospective approach. Subsequently, the Company accounts for its convertible notes as a single debt instrument. At the adoption of ASU 2020-06, portions previously allocated to equity and the remaining convertible notes discount were both reversed. The reversal of the equity portions of the convertible notes totaled $18.3 million, net of taxes which was recorded as a reduction to additional paid-in capital. The adoption of ASU 2020-06 resulted in a $10.7 million net adjustment to beginning retained earnings. The value of the convertible note at issuance and the carrying value as of September 30, 2021 and December 31, 2020 are presented in the tables below: As of September 30, 2021 Amortization/ Gross Accumulated Carrying Amount (Dollars in thousands) Convertible notes principal balance $ 217,500 $ — $ 217,500 Issuance costs to be capitalized 5 years (4,119) 2,593 (1,526) Carrying balance of convertible notes $ 213,381 $ 2,593 $ 215,974 As of December 31, 2020 Amortization/ Gross Accumulated Carrying Amount (Dollars in thousands) Convertible notes principal balance $ 217,500 $ — $ 217,500 Discount 5 years (21,880) 10,951 (10,929) Issuance costs to be capitalized 5 years (4,119) 2,113 (2,006) Carrying balance of convertible notes $ 191,501 $ 13,064 $ 204,565 Interest expense on the convertible notes for the three and nine months ended September 30, 2021, totaled $1.3 million and $4.0 million, respectively. Interest expense on the convertible notes for the three and nine months ended September 30, 2020, totaled $2.4 million and $7.1 million, respectively. With the adoption of ASU 2020-06, interest expense for the Company’s convertible notes consists of accrued interest on the convertible note coupon and interest expense from capitalized issuance costs. Issuance cost capitalization expense will only be recorded for the first five $1.0 million

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The Company offers a loan hedging program to certain loan customers. Through this program, the Company originates a variable rate loan with the customer. The Company and the customer will then enter into a fixed interest rate swap. Lastly, an identical offsetting swap is entered into by the Company with a correspondent bank. These “back-to-back” swap arrangements are intended to offset each other and allow the Company to book a variable rate loan, while providing the customer with a contract for fixed interest payments. In these arrangements, the Company’s net cash flow is equal to the interest income received from the variable rate loan originated with the customer. These customer swaps are not designated as hedging instruments and are recorded at fair value in other assets and other liabilities. The changes in fair value is recognized in the income statement as other income and fees. At September 30, 2021 and December 31, 2020, interest rate swaps related to the Company’s loan hedging program that were outstanding are presented in the following table: September 30, 2021 December 31, 2020 (Dollars in thousands) Interest rate swaps on loans with correspondent banks (included in other assets) Notional amount $ 98,916 $ — Weighted average remaining term (years) 8.6 0.0 Pay fixed rate (weighted average) 2.90 % — % Received variable rate (weighted average) 2.10 % — % Estimated fair value $ 2,395 $ — Interest rate swaps on loans with correspondent banks (included in other liabilities) Notional amount $ 453,289 $ 503,929 Weighted average remaining term (years) 5.8 6.8 Pay fixed rate (weighted average) 3.97 % 3.86 % Received variable rate (weighted average) 2.18 % 2.26 % Estimated fair value $ (18,802) $ (34,606) Back to back interest rate swaps with loan customers (included in other liabilities) Notional amount $ 98,916 $ — Weighted average remaining term (years) 8.6 0.0 Received fixed rate (weighted average) 2.90 % — % Pay variable rate (weighted average) 2.10 % — % Estimated fair value $ (2,395) $ — Back to back interest rate swaps with loan customers (included in other assets) Notional amount $ 453,289 $ 503,929 Weighted average remaining term (years) 5.8 6.8 Received fixed rate (weighted average) 3.97 % 3.86 % Pay variable rate (weighted average) 2.18 % 2.26 % Estimated fair value $ 18,802 $ 34,606 At September 30, 2021, the Company had risk participation agreements with an outside counterparty for an interest rate swap related to a loan in which it is a participant. The risk participation agreement provides credit protection to the financial institution should the borrower fail to perform on its interest rate derivative contract. Risk participation agreements are credit derivatives not designated as hedges. Credit derivatives are not speculative and are not used to manage interest rate risk in assets or liabilities. Changes in the fair value in credit derivatives are recognized directly in earnings. The fee received, less the estimate of the loss for credit exposure, was recognized in earnings at the time of the transaction. At September 30, 2021, the notional amount of the risk participation agreements sold was $111.4 million with a credit valuation adjustment of $52 thousand. At December 31, 2020, the notional amount of the risk participation agreement sold was $112.8 million with a credit valuation adjustment of $398 thousand. As part of the overall liability management, the Company utilizes interest rate swap agreements to help manage interest rate risk positions. The notional amount of the interest rate swaps do not represent the amount exchanged by the parties. The exchange of cash flows is determined by reference to the notional amounts and the other terms of the interest rate swap agreements. The Company had one existing interest rate swap agreement as of September 30, 2021 and December 31, 2020 with a notional amount of $100.0 million designated as cash flow hedges of certain LIBOR-based debt. The swap was entered into in 2020 and was determined to be fully effective during the period presented. The aggregate fair value of the swap is recorded in derivative liabilities with changes in fair value recorded in other comprehensive income. The gain or loss on the derivative is recorded in accumulated other comprehensive income (“AOCI”) and is subsequently reclassified into interest expense and interest income in the period during which the hedged forecasted transaction affects earnings. Amounts reported in AOCI related to interest rate swap derivatives will be reclassified to interest income and interest expense as interest payments are received or paid on the Company’s derivatives. The Company expects the hedge to remain fully effective during the remaining term of the swap. For the three and nine months ended September 30, 2021, the Company reclassified $88 thousand and $227 thousand, respectively, from accumulated other comprehensive income to interest expense. For the three and nine months ended September 30, 2020, the Company reclassified $(21) thousand and $118 thousand from accumulated comprehensive income to interest income, respectively. September 30, 2021 December 31, 2020 (Dollars in thousands) Interest rate swaps designated as cash flow hedge (included in other assets) Notional amount $ 100,000 $ — Weighted average remaining term (years) 3.5 0.0 Received variable rate (weighted average) 0.14 % — % Pay fixed rate (weighted average) 0.49 % — % Estimated fair value $ 1,041 $ — Interest rate swaps designated as cash flow hedge (included in other liabilities) Notional amount $ — $ 100,000 Weighted average remaining term (years) 0.0 4.3 Received variable rate (weighted average) — % 0.22 % Pay fixed rate (weighted average) — % 0.49 % Estimated fair value $ — $ (602) The Company enters into various stand-alone mortgage-banking derivatives in order to hedge the risk associated with the fluctuation of interest rates. Changes in fair value are recorded as mortgage banking revenue. Residential mortgage loans funded with interest rate lock commitments and forward commitments for the future delivery of mortgage loans to third party investors are considered derivatives. At September 30, 2021, the Company had approximately $21.3 million in interest rate lock commitments and total forward sales commitments for the future delivery of residential mortgage loans. At December 31, 2020, the Company had approximately $43.8 million in interest rate lock commitments and total forward sales commitments for the future delivery of residential mortgage loans. The following table reflects the notional amount and fair value of mortgage banking derivatives for the dates indicated: As of September 30, 2021 As of December 31, 2020 Notional Amount Fair Value Notional Amount Fair Value (Dollars in thousands) Assets: Interest rate lock commitments $ 22,479 $ 256 $ 37,507 $ 679 Forward sale contracts related to mortgage banking 21,394 98 8,641 45 Liabilities: Interest rate lock commitments $ 450 $ (1) $ 6,267 $ (31) Forward sale contracts related to mortgage banking 5,693 (23) 35,133 (79)

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In the normal course of business, the Company is a party to financial instruments with off-balance sheet risk that are used to meet the financing needs of customers. These financial instruments include commitments to extend credit, standby letters of credit, commercial letters of credit, and commitments to fund investments in affordable housing partnerships. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the Consolidated Statements of Financial Condition. The Company’s exposure to credit loss in the event of nonperformance on commitments to extend credit and standby letters of credit is represented by the contractual notional amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations as the Company does for extending loan facilities to customers. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary upon extension of credit, is based on the Company’s credit evaluation of the counterparty. The types of collateral that the Company may hold can vary and may include accounts receivable, inventory, property, plant and equipment, and income-producing properties. Commitments at September 30, 2021 and December 31, 2020 are summarized as follows: September 30, 2021 December 31, 2020 (Dollars in thousands) Commitments to extend credit $ 2,373,741 $ 2,137,178 Standby letters of credit 117,132 108,834 Other letters of credit 55,897 40,508 Commitments to fund investments in affordable housing partnerships 10,286 15,148 In the normal course of business, the Company is involved in various legal claims. The Company has reviewed all legal claims against the Company with counsel and has taken into consideration the views of such counsel as to the potential outcome of the claims. Loss contingencies for all legal claims totaled $144 thousand at September 30, 2021 and $1.3 million at December 31, 2020. It is reasonably possible that the Company may incur losses in excess of the amounts currently accrued. However, at this time, the Company is unable to estimate the range of additional losses that are reasonably possible because of a number of factors, including the fact that certain of these litigation matters are still in their early stages and involve claims that the Company believes has little to no merit. The Company has considered these and other possible loss contingencies and does not expect the amounts to be material to the consolidated financial statements.

Goodwill, Intangible Assets, an

Goodwill, Intangible Assets, and Servicing Assets	9 Months Ended
	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Intangible Assets, and Servicing Assets	Goodwill, Intangible Assets, and Servicing Assets Goodwill represents the excess of the purchase price over the sum of the estimated fair values of the tangible and identifiable intangible assets acquired less the estimated fair value of the liabilities assumed. Goodwill has an indefinite useful life and is evaluated for impairment annually or more frequently if events and circumstances indicate that the asset might be impaired. An impairment loss is recognized to the extent that the carrying amount exceeds the asset’s fair value. At December 31, 2020, the Company performed a Step 1 fair value assessment and determined that goodwill was not impaired as the estimated fair value of the Company exceeded the book value. As the Company operates as single business unit, goodwill impairment was assessed based on the Company as a whole. Goodwill is not amortized for book purposes and is not tax deductible. The carrying amount of the Company’s goodwill as of September 30, 2021 and December 31, 2020 was $464.5 million. There was no impairment of goodwill recorded during the three and nine months ended September 30, 2021. Core deposit intangible assets are amortized over their estimated lives or ten years. Amortization expense related to core deposit intangible assets totaled $509 thousand and $531 thousand for the three months ended September 30, 2021 and 2020, respectively. The amortization expense related to core deposit intangible assets totaled $1.5 million and $1.6 million for the nine months ended September 30, 2021 and 2020, respectively. The following table provides information regarding the core deposit intangibles at September 30, 2021 and December 31, 2020: As of September 30, 2021 As of December 31, 2020 Core Deposit Intangibles Related To: Amortization Period Gross Accumulated Carrying Amount Accumulated Carrying Amount (Dollars in thousands) Foster Bankshares acquisition 10 years $ 2,763 $ (2,459) $ 304 $ (2,322) $ 441 Wilshire Bancorp acquisition 10 years 18,138 (10,262) 7,876 (8,871) 9,267 Total $ 20,901 $ (12,721) $ 8,180 $ (11,193) $ 9,708 Servicing assets are recognized when SBA and residential mortgage loans are sold with the servicing retained by the Company and the related income is recorded as a component of gains on sales of loans. Servicing assets are initially recorded at fair value based on the present value of the contractually specified servicing fee, net of servicing costs, over the estimated life of the loan, using a discount rate. The Company’s servicing costs approximates the industry average servicing costs of 40 basis points. All classes of servicing assets are subsequently measured using the amortization method which requires servicing rights to be amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying loans. Management periodically evaluates servicing assets for impairment based upon the fair value of the rights as compared to the carrying amount. Impairment is determined by stratifying rights into groupings based on loan type. Impairment is recognized through a valuation allowance for an individual grouping, to the extent that fair value is less than the carrying amount. As of September 30, 2021 and December 31, 2020, the Company did not have a valuation allowance on it servicing assets. The changes in servicing assets for the three and nine months ended September 30, 2021 and 2020 were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (Dollars in thousands) Balance at beginning of period $ 11,566 $ 14,164 $ 12,692 $ 16,417 Additions through originations of servicing assets 710 1,190 2,039 2,326 Amortization (1,489) (1,636) (3,944) (5,025) Balance at end of period $ 10,787 $ 13,718 $ 10,787 $ 13,718 Loans serviced for others are not reported as assets. The principal balances of loans serviced for other institutions were $1.12 billion as of September 30, 2021 and $1.23 billion as of December 31, 2020. The Company utilizes the discounted cash flow method to calculate the initial excess servicing assets. The inputs used in evaluating servicing assets for impairment at September 30, 2021 and December 31, 2020 are presented below. September 30, 2021 December 31, 2020 SBA Servicing Assets: Weighted-average discount rate 12.48% 9.93% Constant prepayment rate 14.37% 14.40% Mortgage Servicing Assets: Weighted-average discount rate 8.63% 8.26% Constant prepayment rate 9.19% 8.63%

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three months ended September 30, 2021, the Company had an income tax provision totaling $19.9 million on pretax income of $75.4 million, representing an effective tax rate of 26.40%, compared with an income tax provision of $9.3 million on pretax income of $39.7 million, representing an effective tax rate of 23.28% for the three months ended September 30, 2020. For the nine months ended September 30, 2021, the Company had an income tax provision totaling $51.6 million on pretax income of $204.6 million, representing an effective tax rate of 25.24%, compared with an income tax provision of $25.5 million on pretax income of $108.7 million, representing an effective tax rate of 23.45% for the nine months ended September 30, 2020. The increase in effective tax rate for the three and nine months ended September 30, 2021 compared to the three and nine months ended September 30, 2020 was primarily due to affordable housing partnership investment tax credits benefit having a lower effect on larger annual projected pre-tax book income. The Company and its subsidiaries are subject to U.S. federal income tax, as well as state income taxes. The Company had total unrecognized tax benefits of $2.8 million at September 30, 2021 and December 31, 2020, that relate to uncertainties associated with federal and state income tax matters. The Company recognizes interest and penalties on income tax matters in income tax expense. The Company recorded approximately $347 thousand and $276 thousand, for accrued interest (no portion was related to penalties) at September 30, 2021 and December 31, 2020, respectively. Management believes it is reasonably possible that the unrecognized tax benefits may decrease by $902 thousand in the next twelve months due to a settlement with the state tax authorities. The statute of limitations for the assessment of income taxes related to the consolidated federal income tax return is closed for all tax years up to and including 2016. The expiration of the statute of limitations for the assessment of income and franchise taxes related to the various state income and franchise tax returns varies by state. The Company is currently under examination by the New York City Department of Finance for the 2016, 2017 and 2018 tax years. While the outcome of the examination is unknown, the Company expects no material adjustments. Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities (without regard to certain changes to deferred taxes). Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carry forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value is defined as the exchange price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date reflecting assumptions that a market participant would use when pricing an asset or liability. There are three levels of inputs that may be used to measure fair value. The fair value inputs of the instruments are classified and disclosed in one of the following categories pursuant to ASC 820: Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. The quoted price shall not be adjusted for any blockage factor (i.e., size of the position relative to trading volume). Level 2 - Pricing inputs are inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. Fair value is determined through the use of models or other valuation methodologies, including the use of pricing matrices. If the asset or liability has a specified (contractual) term, a Level 2 input must be observable for substantially the full term of the asset or liability. Level 3 - Pricing inputs are unobservable for the asset or liability. Unobservable inputs are used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at the measurement date. The inputs into the determination of fair value require significant management judgment or estimation. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, an asset’s or liability’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. The Company uses the following methods and assumptions in estimating fair value disclosures for financial instruments. Financial assets and liabilities recorded at fair value on a recurring and non-recurring basis are listed as follows: Securities Available for Sale The fair values of securities available for sale are determined by obtaining quoted prices on nationally recognized securities exchanges (Level 1 inputs) or matrix pricing, which is a technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities’ relationship to other benchmark quoted securities (Level 2 inputs). The fair values of the Company’s Level 3 securities available for sale were measured using an income approach valuation technique. The primary inputs and assumptions used in the fair value measurement was derived from the security’s underlying collateral, which included discount rate, prepayment speeds, payment delays, and an assessment of the risk of default of the underlying collateral, among other factors. Significant increases or decreases in any of the inputs or assumptions could result in a significant increase or decrease in the fair value measurement. Equity Investments With Readily Determinable Fair Value The fair value of the Company’s equity investments with readily determinable fair value is comprised of mutual funds. The fair value for these investments is obtained from unadjusted quoted prices in active markets on the date of measurement and is therefore classified as Level 1. Interest Rate Swaps The Company offers interest rate swaps to certain loan customers to allow them to hedge the risk of rising interest rates on their variable rate loans. The Company originates a variable rate loan and enters into a variable-to-fixed interest rate swap with the customer. The Company also enters into an offsetting swap with a correspondent bank. These back-to-back agreements are intended to offset each other and allow the Company to originate a variable rate loan, while providing a contract for fixed interest payments for the customer. The net cash flow for the Company is equal to the interest income received from a variable rate loan originated with the customer. The fair value of these derivatives is based on a discounted cash flow approach. Due to the observable nature of the inputs used in deriving the fair value of these derivative contracts, the valuation of interest rate swaps is classified as Level 2. Mortgage Banking Derivatives Mortgage banking derivative instruments consist of interest rate lock commitments and forward sale contracts that trade in liquid markets. The fair value is based on the prices available from third party investors. Due to the observable nature of the inputs used in deriving the fair value, the valuation of mortgage banking derivatives is classified as Level 2. Other Derivatives Other derivatives consist of interest rate swaps designated as cash flow hedges and risk participation agreements. The fair values of these other derivative financial instruments are based upon the estimated amount the Company would receive or pay to terminate the instruments, taking into account current interest rates and, when appropriate, the current credit worthiness of the counterparties. Interest rate swaps designated as cash flow hedges are classified within Level 2. Credit derivatives such as risk participation agreements are valued based on credit worthiness of the underlying borrower which is a significant unobservable input and therefore is classified as Level 3. Collateral Dependent Loans The fair values of collateral dependent loans are generally measured for ACL using the practical expedients permitted by ASC 326-20-35-5 including collateral dependent loans measured at an observable market price (if available), or at the fair value of the loan’s collateral (if the loan is collateral dependent). Fair value of the loan’s collateral, when the loan is dependent on collateral, is determined by appraisals or independent valuation, less costs to sell of 8.5%. Appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and income approach. Adjustment may be made in the appraisal process by the independent appraiser to adjust for differences between the comparable sales and income data available for similar loans and the underlying collateral. For commercial and industrial and asset backed loans, independent valuations may include a 20-60% discount for eligible accounts receivable and a 50-70% discount for inventory. These result in a Level 3 classification. OREO OREO is fair valued at the time the loan is foreclosed upon and the asset is transferred to OREO. The value is based primarily on third party appraisals, less costs to sell of up to 8.5% and result in a Level 3 classification of the inputs for determining fair value. OREO is reviewed and evaluated on at least a quarterly basis for additional impairment and adjusted to lower of cost or market accordingly, based on the same factors identified above. Loans Held For Sale Loans held for sale are carried at the lower of cost or fair value, as determined by outstanding commitments from investors, or based on recent comparable sales (Level 2 inputs), if available, and if not available, are based on discounted cash flows using current market rates applied to the estimated life and credit risk (Level 3 inputs) or may be assessed based upon the fair value of the collateral, which is obtained from recent real estate appraisals (Level 3 inputs). These appraisals may utilize a single valuation approach or a combination of approaches including the income approach. Adjustments are routinely made in the appraisal process by the appraisers to adjust for differences between the comparable sales and income data available. Such adjustments are typically significant and result in a Level 3 classification of the inputs for determining fair value. Assets and liabilities measured at fair value on a recurring basis are summarized below: Fair Value Measurements at the End of September 30, 2021 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Securities available for sale: U.S. Government agency and U.S. Government sponsored enterprises: Collateralized mortgage obligations $ 1,071,188 $ — $ 1,071,188 $ — Mortgage-backed securities: Residential 763,395 — 763,395 — Commercial 591,661 — 591,661 — Asset-backed securities 118,603 — 118,603 — Corporate securities 22,578 — 22,578 — Municipal securities 102,064 — 101,009 1,055 Equity investments with readily determinable fair value 27,077 27,077 — — Interest rate swaps 21,197 — 21,197 — Mortgage banking derivatives 354 — 354 — Other derivatives 1,041 — 1,041 — Liabilities: Interest rate swaps 21,197 — 21,197 — Mortgage banking derivatives 24 — 24 — Other derivatives 52 — — 52 Fair Value Measurements at the End of December 31, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Securities available for sale: U.S. Government agency and U.S. Government sponsored enterprises: Collateralized mortgage obligations $ 1,001,317 $ — $ 1,001,317 $ — Mortgage-backed securities: Residential 681,013 — 681,013 — Commercial 507,879 — 507,879 — Corporate securities 6,134 — 6,134 — Municipal securities 89,268 — 88,246 1,022 Equity investments with readily determinable fair value 27,611 27,611 — — Interest rate swaps 34,606 — 34,606 — Mortgage banking derivatives 724 — 724 — Liabilities: Interest rate swaps 34,606 — 34,606 — Mortgage banking derivatives 110 — 110 — Other derivatives 1,000 — 602 398 There were no transfers between Level 1, 2, and 3 during the three and nine months ended September 30, 2021 and 2020. The table below presents a reconciliation and income statement classification of gains (losses) for our municipal security and risk participation agreements measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (Dollars in thousands) Municipal securities: Beginning Balance $ 1,058 $ 1,066 $ 1,022 $ 1,076 Change in fair value included in other comprehensive income (loss) (3) (18) 33 (28) Ending Balance $ 1,055 $ 1,048 $ 1,055 $ 1,048 Risk participation agreements: Beginning Balance $ 64 $ 223 $ 398 $ — Change in fair value included in income (12) (24) (346) 199 Ending Balance $ 52 $ 199 $ 52 $ 199 The Company measures certain assets at fair value on a non-recurring basis including collateral dependent loans, loans held for sale, and OREO. These fair value adjustments result from individually evaluated ACL recognized during the period, application of the lower of cost or fair value on loans held for sale, and the application of fair value less cost to sell on OREO. Assets measured at fair value on a non-recurring basis are summarized below: Fair Value Measurements at the End of September 30, 2021 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Collateral dependent loans at fair value: Real estate loans $ 12,882 $ — $ — $ 12,882 Commercial business 3,504 — — 3,504 Loans held for sale, net 131,176 — 131,176 — OREO 14,783 — — 14,783 Fair Value Measurements at the End of December 31, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Collateral dependent loans at fair value: Real estate loans $ 21,688 $ — $ — $ 21,688 Commercial business 7,694 — — 7,694 Loans held for sale, net — — — — OREO 19,260 — — 19,260 For assets measured at fair value on a non-recurring basis, the total net losses, which include charge offs, recoveries, recorded ACL, valuations, and recognized gains and losses on sales are summarized below: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (Dollars in thousands) Assets: Collateral dependent loans at fair value: Real estate loans $ (1,083) $ (5,951) $ (1,496) $ (8,108) Commercial business (2,025) (2,902) (2,025) (5,470) Loans held for sale, net (6,121) — (17,900) — OREO (259) (1,682) (582) (4,118) Fair Value of Financial Instruments Carrying amounts and estimated fair values of financial instruments, not previously presented, at September 30, 2021 and December 31, 2020 were as follows: September 30, 2021 Carrying Amount Estimated Fair Value Fair Value Measurement (Dollars in thousands) Financial Assets: Cash and cash equivalents $ 627,352 $ 627,352 Level 1 Interest bearing deposits in other financial institutions 12,340 12,348 Level 2 Equity investments without readily determinable fair values 31,435 31,435 Level 2 Loans held for sale 179,117 181,836 Level 2 Loans receivable—net 13,281,917 13,155,789 Level 3 Accrued interest receivable 47,102 47,102 Level 2/3 Servicing assets, net 10,787 13,494 Level 3 Customers’ liabilities on acceptances 1,808 1,808 Level 2 Financial Liabilities: Noninterest bearing deposits $ 6,007,586 $ 6,007,586 Level 2 Saving and other interest bearing demand deposits 6,186,170 6,186,170 Level 2 Time deposits 2,868,771 2,871,600 Level 2 FHLB advances 200,000 202,719 Level 2 Convertible notes, net 215,974 215,325 Level 1 Subordinated debentures 105,057 114,854 Level 2 Accrued interest payable 5,367 5,367 Level 2 Acceptances outstanding 1,808 1,808 Level 2 December 31, 2020 Carrying Amount Estimated Fair Value Fair Value Measurement (Dollars in thousands) Financial Assets: Cash and cash equivalents $ 350,579 $ 350,579 Level 1 Interest bearing deposits in other financial institutions 28,642 28,669 Level 2 Equity investments without readily determinable fair values 32,088 32,088 Level 2 Loans held for sale 17,743 18,288 Level 2 Loans receivable—net 13,356,472 13,428,706 Level 3 Accrued interest receivable 59,430 59,430 Level 2/3 Servicing assets, net 12,692 15,785 Level 3 Customers’ liabilities on acceptances 1,184 1,184 Level 2 Financial Liabilities: Noninterest bearing deposits $ 4,814,254 $ 4,814,254 Level 2 Saving and other interest bearing demand deposits 5,533,183 5,533,183 Level 2 Time deposits 3,986,475 3,992,973 Level 2 FHLB advances 250,000 254,456 Level 2 Convertible notes, net 204,565 201,731 Level 1 Subordinated debentures 104,178 98,948 Level 2 Accrued interest payable 14,706 14,706 Level 2 Acceptances outstanding 1,184 1,184 Level 2 The Company measures assets and liabilities for its fair value disclosures based on an exit price notion. Although the exit price notion represents the value that would be received to sell an asset or paid to transfer a liability, the actual price received for a sale of assets or paid to transfer liabilities could be different from exit price disclosed. The methods and assumptions used to estimate fair value are described as follows: The carrying amount is the estimated fair value for cash and cash equivalents, savings and other interest bearing demand deposits, equity investments without readily determinable fair values, customer’s and Bank’s liabilities on acceptances, noninterest bearing deposits, short-term debt, secured borrowings and variable rate loans or deposits that reprice frequently and fully. The fair value of loans is determined through a discounted cash flow analysis which incorporates probability of default and loss given default rates on an individual loan basis. The discount rate is based on the LIBOR Swap Rate for fixed rate loans, while variable loans start with the corresponding index rate and an adjustment was made on certain loans which considered factors such as servicing costs, capital charges, duration, asset type incremental costs, and use of projected cash flows. Residential real estate loans fair values include Fannie Mae and Freddie Mac prepayment speed assumptions or a third party index based on historical prepayment speeds. Fair value of time deposits is based on discounted cash flow analysis using recent issuance rates over the prior three months and a market rate analysis of recent offering rates for retail products. Wholesale time deposit fair values incorporate brokered time deposit offering rates. The fair value of the Company’s debt is based on current rates for similar financing. Fair value for the Company’s convertible notes is based on the actual last traded price of the notes. The fair value of commitments to fund loans represents fees currently charged to enter into similar agreements with similar remaining maturities and is not presented herein. The fair value of these financial instruments is not material to the consolidated financial statements.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Stockholders’ Equity	Stockholders’ Equity Total stockholders’ equity at September 30, 2021 was $2.07 billion, compared to $2.05 billion at December 31, 2020. In March 2020, the Company completed the $50.0 million repurchase plan though the repurchase of 2,716,034 shares of common stock totaling $36.2 million. In July 2021, the Company’s Board of Directors approved another share repurchase program that authorizes the Company to repurchase an additional $50.0 million of its common stock. During the three months ended September 30, 2021, the Company repurchased 3,487,426 shares of common stock totaling $47.2 million as part of this share repurchase program which was recorded as treasury stock. For the three months ended September 30, 2021 and 2020, the Company paid cash dividends of $0.14 per common share. For both the nine months ended September 30, 2021 and 2020, the Company paid cash dividends of $0.42 per common share. The following table presents the quarterly changes to accumulated other comprehensive income for the three and nine months ended September 30, 2021 and 2020: Three Months Ended, Nine Months Ended, September 30, 2021 September 30, 2020 September 30, 2021 September 30, 2020 (Dollars in thousands) Balance at beginning of period $ 15,051 $ 38,149 $ 32,753 $ 9,149 Unrealized net gains (losses) on securities available for sale (16,433) (303) (43,050) 41,820 Unrealized net gains (losses) on interest rate swaps used for cash flow hedge 120 54 1,643 (796) Reclassification adjustments for net losses (gains) realized in net income 88 (7,510) 227 (7,649) Tax effect 4,717 2,292 11,970 (9,842) Other comprehensive income (loss), net of tax (11,508) (5,467) (29,210) 23,533 Balance at end of period $ 3,543 $ 32,682 $ 3,543 $ 32,682 Reclassifications for net gains realized in net income for the three and nine months ended September 30, 2021 relate to net gains on interest rate swaps used for cash flow hedges. Gains on interest rate swaps are recorded in noninterest income under other income and fee in the Consolidated Statements of Income.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation In 2019, the Company’s stockholders approved the 2019 stock-based incentive plan (the “2019 Plan”), which provides for grants of stock options, SARs, restricted stock, performance shares, and performance units to non-employee directors, employees, and potentially consultants of the Company. Stock options may be either incentive stock options (“ISOs”), as defined in Section 422 of the Internal Revenue Code of 1986, as amended (the “Code”), or nonqualified stock options (“NQSOs”). The 2019 Plan replaces the 2016 Plan and stipulates that no further awards shall be made under prior plans. Therefore, future awards will only be issued from the 2019 Plan. The 2019 Plan provides the Company flexibility to (i) attract and retain qualified non-employee directors, executives, other key employees, and potentially consultants with appropriate equity-based awards to; (ii) motivate high levels of performance; (iii) recognize employee and potentially consultants’ contributions to the Company’s success; and (iv) align the interests of the participants with those of the Company’s stockholders. The 2019 Plan initially had 4,400,000 shares that were available for grant to participants. The exercise price for shares under an ISO may not be less than 100% of fair market value on the date the award is granted under the Code. Similarly, under the terms of the 2019 Plan, the exercise price for SARs and NQSOs may not be less than 100% of fair market value on the date of grant. Performance units are awarded to participants at the market price of the Company’s common stock on the date of award (after the lapse of the restriction period and the attainment of the performance criteria). All options not exercised generally expire 10 years after the date of grant. ISOs, SARs, and NQSOs have vesting periods of three Under the 2019 Plan, 2,338,326 shares were available for future grants as of September 30, 2021. With the exception of the shares underlying stock options and restricted stock awards, the Board of Directors may choose to settle the awards by paying the equivalent cash value or by delivering the appropriate number of shares. The following is a summary of the Company’s stock option activity for the nine months ended September 30, 2021: Number of Shares Weighted-Average Exercise Price Per Share Weighted-Average Aggregate Intrinsic Value (Dollars in thousands) Outstanding - January 1, 2021 851,580 $ 15.25 Granted — — Exercised — — Expired (16,703) 17.12 Forfeited — — Outstanding - September 30, 2021 834,877 $ 15.22 3.66 $ 1,011 Options exercisable - September 30, 2021 834,877 $ 15.22 3.66 $ 1,011 The following is a summary of the Company’s restricted stock and performance unit activity for the nine months ended September 30, 2021: Number of Shares Weighted-Average Grant Date Fair Value Outstanding (unvested) - January 1, 2021 1,718,838 $ 10.73 Granted 666,163 15.61 Vested (622,003) 11.89 Forfeited (164,530) 13.13 Outstanding (unvested) - September 30, 2021 1,598,468 $ 12.07 The total fair value of restricted stock and performance units vested for the nine months ended September 30, 2021 and 2020 was $9.4 million and $3.3 million, respectively. The Company maintains the Hope Employee Stock Purchase Plan (“ESPP”), which allows eligible employees to purchase the Company’s common shares through payroll deductions which build up between the offering date and the purchase date. At the purchase date, the Company uses the accumulated funds to purchase shares of the Company’s common stock on behalf of the participating employees at a 10% discount to the closing price of the Company’s common shares. The closing price is the lower of either the closing price on the first day of the offering period or the closing price on the purchase date. The dollar amount of common shares purchased under the ESPP must not exceed 20% of the participating employee’s base salary, subject to a cap of $25 thousand in stock value based on the grant date. The ESPP is considered compensatory under GAAP and compensation expense for the ESPP is recognized as part of the Company’s stock-based compensation expense. The compensation expense for the ESPP during the three months ended September 30, 2021 and 2020 was $135 thousand and $108 thousand, respectively. The compensation expense for the ESPP during the nine months ended September 30, 2021 and 2020 was $394 thousand and $205 thousand, respectively. The total amounts charged against income related to stock-based payment arrangements, including the ESPP, were $2.2 million and $2.2 million for the three months ended September 30, 2021 and 2020, respectively. For the nine months ended September 30, 2021 and 2020, $6.8 million and $6.0 million, respectively, of stock-based payment arrangements were charged against income. The income tax benefit recognized was approximately $579 thousand and $507 thousand for the three months ended September 30, 2021 and 2020, respectively. The income tax benefit recognized for the nine months ended September 30, 2021 and 2020, was approximately $1.7 million and $1.4 million, respectively. At September 30, 2021, there was no unrecognized compensation expense related to non-vested stock option grants. Unrecognized compensation expense related to non-vested restricted stock and performance units was $11.3 million and is expected to be recognized over a weighted average vesting period of 1.94 years.

Regulatory Matters

Regulatory Matters	9 Months Ended
	Sep. 30, 2021
Banking Regulation [Abstract]
Regulatory Matters	Regulatory Matters The Company and the Bank are subject to various regulatory capital requirements administered by the federal and state banking agencies. Failure to meet minimum capital requirements can result in certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a material and adverse effect on the Company’s and the Bank’s business, financial condition and results of operation, such as restrictions on growth or the payment of dividends or other capital distributions or management fees. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities and certain off-balance-sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. In July 2013, the federal bank regulatory agencies adopted final regulations, which revised their risk-based and leverage capital requirements for banking organizations to meet requirements of the Dodd-Frank Act and to implement the Basel III international agreements reached by the Basel Committee. The final rules became effective for the Company and the Bank on January 1, 2015 and were subject to a phase-in period through January 1, 2019. The final rules that had an impact on the Company and the Bank include: • An increase in the minimum Tier 1 capital ratio from 4.00% to 6.00% of risk-weighted assets; • A new category and a required 4.50% of risk-weighted assets ratio was established for “Common Equity Tier 1” as a subset of Tier 1 capital limited to common equity; • A minimum non-risk-based leverage ratio was set at 4.00%, eliminating a 3.00% exception for higher rated banks; • Changes in the permitted composition of Tier 1 capital to exclude trust preferred securities, mortgage servicing rights and certain deferred tax assets and include unrealized gains and losses on available for sale debt and equity securities; • The risk-weights of certain assets for purposes of calculating the risk-based capital ratios are changed for high volatility commercial real estate acquisition, development and construction loans, certain past due non-residential mortgage loans and certain mortgage-backed and other securities exposures; and • A capital conservation buffer of 2.5% of risk weighted assets over each of the required capital ratios was added and must be met to avoid limitations on the ability of the B ank to pay dividends, repurchase shares, or pay discretionary bonuses. As of September 30, 2021, the capital ratios for the Company and the Bank were in excess of all regulatory minimum capital ratios with the addition of the conservation buffer. On January 1, 2020, the Company adopted ASU 2016-13 and implemented the CECL methodology. In response to the COVID-19 pandemic, federal regulatory agencies published a final rule that provides the option to delay the cumulative effect of the day 1 impact of CECL adoption on regulatory capital, along with 25% of the change in the adjusted allowance for credit losses (as computed for regulatory capital purposes which excludes PCD loans), for two years, followed by a three-year phase-in period. The Company has elected the five-year transition period consistent with the final rule issued by the federal regulatory agencies. As of September 30, 2021 and December 31, 2020, the most recent regulatory notification categorized the Bank as “well-capitalized” under the regulatory framework for prompt corrective action. To generally be categorized as “well-capitalized”, the Bank must maintain minimum total risk-based, Tier 1 risk-based, common equity Tier 1, and Tier 1 leverage ratios as set forth in the following table. There are no conditions or events since the most recent notification from regulators that management believes has changed the institution’s category. The Company’s and the Bank’s levels and ratios are presented in the tables below for the dates indicated and include the effects of the Company’s election to utilize the five-year transition described above: Actual Required For Capital Adequacy Purposes Minimum Capital Adequacy Required To Be Well Capitalized As of September 30, 2021 Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) Common equity Tier 1 capital Company $ 1,623,011 11.01 % $ 663,201 4.50 % $ 1,031,647 7.00 % N/A N/A Bank $ 1,911,158 12.97 % $ 662,865 4.50 % $ 1,031,124 7.00 % $ 957,472 6.50 % Total capital Company $ 1,830,601 12.42 % $ 1,179,025 8.00 % $ 1,547,470 10.50 % N/A N/A Bank $ 2,017,592 13.70 % $ 1,178,427 8.00 % $ 1,546,686 10.50 % $ 1,473,034 10.00 % Tier 1 capital Company $ 1,724,167 11.70 % $ 884,269 6.00 % $ 1,252,714 8.50 % N/A N/A Bank $ 1,911,158 12.97 % $ 883,820 6.00 % $ 1,252,079 8.50 % $ 1,178,427 8.00 % Tier 1 capital Company $ 1,724,167 9.98 % $ 690,864 4.00 % N/A N/A N/A N/A Bank $ 1,911,158 11.07 % $ 690,723 4.00 % N/A N/A $ 863,404 5.00 % Actual Required For Capital Adequacy Purposes Minimum Capital Adequacy Required To Be Well Capitalized As of December 31, 2020 Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) Common equity Tier 1 capital Company $ 1,568,508 10.94 % $ 645,366 4.50 % $ 1,003,902 7.00 % N/A N/A Bank $ 1,850,091 12.90 % $ 645,277 4.50 % $ 1,003,764 7.00 % $ 932,066 6.50 % Total capital Company $ 1,846,229 12.87 % $ 1,147,317 8.00 % $ 1,505,853 10.50 % N/A N/A Bank $ 2,027,534 14.14 % $ 1,147,159 8.00 % $ 1,505,646 10.50 % $ 1,433,948 10.00 % Tier 1 capital Company $ 1,668,786 11.64 % $ 860,487 6.00 % $ 1,219,024 8.50 % N/A N/A Bank $ 1,850,091 12.90 % $ 860,369 6.00 % $ 1,218,856 8.50 % $ 1,147,159 8.00 % Tier 1 capital Company $ 1,668,786 10.22 % $ 653,163 4.00 % N/A N/A N/A N/A Bank $ 1,850,091 11.33 % $ 653,241 4.00 % N/A N/A $ 816,551 5.00 %

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition With the adoption of ASU 2014-09 (Topic 606), the Company recognizes revenue when obligations under the terms of a contract with customers are satisfied. Topic 606 does not apply to revenue associated with financial instruments, including revenue from loans and securities. In addition, certain noninterest income streams such as fees associated with mortgage servicing rights, financial guarantees, derivatives, and certain credit card fees are also out of scope of the new guidance. Topic 606 is applicable to noninterest revenue streams such as deposit related fees, wire transfer fees, and certain OREO related net gains or expenses. However, the recognition of these revenue streams for the Company did not change significantly upon adoption of Topic 606. Noninterest revenue streams within the scope of Topic 606 are discussed below. Service Charges on Deposit Accounts and Wire Transfer Fees Service charges on noninterest and interest bearing deposit accounts consist of monthly service charges, customer analysis charges, non-sufficient funds (“NSF”) charges, and other deposit account related charges. The Company’s performance obligation for account analysis charges and monthly service charges is generally satisfied, and the related revenue is recognized over the period in which the service is provided. NSF charges, other deposit account related charges, and wire transfer fees are transaction based, and therefore the Company’s performance obligation is satisfied at the point of the transaction, and related revenue recognized at that point in time. Payment for service charges on deposit accounts is primarily received immediately or in the following month through a direct charge to customers’ accounts. Service charges on deposit accounts and wire transfers are summarized below: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (Dollars in thousands) Noninterest bearing deposit account income: Monthly service charges $ 259 $ 303 $ 808 $ 1,001 Customer analysis charges 847 1,693 2,332 5,074 NSF charges 606 608 1,921 2,824 Other service charges 81 110 252 484 Total noninterest bearing deposit account income 1,793 2,714 5,313 9,383 Interest bearing deposit account income: Monthly service charges 21 22 68 69 Total service fees on deposit accounts $ 1,814 $ 2,736 $ 5,381 $ 9,452 Wire transfer fee income: Wire transfer fees $ 766 $ 812 $ 2,256 $ 2,383 Foreign exchange fees 70 80 347 327 Total wire transfer fees $ 836 $ 892 $ 2,603 $ 2,710 OREO are often sold in transactions that, under ASC 606, may not be considered a contract with a customer because the sale of the asset may not be an output of the Company’s ordinary activities. However, sales of nonfinancial assets, including in-substance nonfinancial assets, should be accounted for in accordance with ASC 610-20, “ Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets”

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	The Company implemented a strategic plan in 2021 to sell loans with elevated credit risk to help improve the overall credit quality of the loan portfolio. As part of this plan the Company transferred $131.2 million in loans rated as substandard to loans held for sale. As of the date of this report, $74.6 million of the $131.2 million in substandard loans have been sold with $56.6 million in loans remaining as loans held for sale. The substandard loans held as loans held for sale are expected to be sold by year end 2021. The Company has evaluated the effects of events that have occurred subsequent to September 30, 2021 through the issuance date of these consolidated financial statements. Other than the event described above, there have been no material events that would require disclosure in the consolidated financial statements or in the notes to the consolidated financial statements.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2021
Basis Of Presentation [Abstract]
Consolidation	The consolidated financial statements include the accounts of Hope Bancorp and its wholly owned subsidiaries, principally Bank of Hope. All intercompany transactions and balances have been eliminated in consolidation. The Company has made all adjustments, that in the opinion of management, are necessary to fairly present the Company’s financial position at September 30, 2021 and December 31, 2020 and the results of operations for the three and nine months ended September 30, 2021 and 2020. Certain reclassifications have been made to prior period amounts to conform to the current year presentation. The results of operations for the interim periods are not necessarily indicative of results to be anticipated for the full year.
Use of estimates	The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ significantly from those estimates.
Pending Accounting Pronouncements	Pending Accounting Pronouncements In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform: Facilitation of the Effects of Reference Rate Reform on Financial Reporting”. The amendments provide temporary, optional guidance to ease the potential burden in accounting for reference rate reform. The amendments provide optional expedients and exceptions for applying GAAP to transactions affected by reference rate reform if certain criteria are met. The amendments primarily include relief related to contract modifications and hedging relationships, as well as providing a one-time election for the sale or transfer of debt securities classified as held-to-maturity. This one time election may be made at any time after March 12, 2020, but no later than December 31, 2022. The Company is currently in the process of evaluating ASU 2020-04 to determine whether the Company will make this election and is currently assessing the significance of the impact of modifying contracts in consideration of the election of this amendment. In January 2021, the FASB issued ASU 2021-01, “Codification Improvements to Topic 848, Reference Rate Reform”. ASU 2021-01 amends the scope of the recent reference rate reform guidance and clarifies that certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting apply to derivatives that are affected by the discounting transition. New optional expedients allow derivative instruments impacted by changes in the interest rate used for margining, discounting, or contract price alignment (i.e., discount transition) to qualify for certain optional relief. The new optional expedients for contract modifications and hedge accounting are expected to benefit companies, including those with certain centrally cleared derivatives affected by a discount rate transition in 2020. Amendments to the expedients and exceptions in Topic 848 captures the incremental consequences of the scope clarification and tailor the existing guidance to derivative instruments affected by the discounting transition. ASU 2021-01 is effective immediately and can be applied retrospectively to any interim period beginning January 1, 2020 or prospectively to any new modifications in any period including or subsequent to the issuance date. The Company is currently in the process of evaluating ASU 2021-01 and its potential impact to the Company’s contracts.
Financing Receivables	On January 1, 2020 the Company adopted ASU 2016-13, “Measurement of Credit Losses on Financial Instruments”, or CECL. The Company calculates its ACL by estimating expected credit losses on a collective basis for loans that share similar risk characteristics. Loans that do not share similar risk characteristics with other loans are evaluated for credit losses on an individual basis. The Company uses a combination of a modeled and non-modeled approach that incorporates current and future economic conditions to estimate lifetime expected losses on a collective basis. The Company uses Probability of Default (“PD”), Loss Given Default (“LGD”), and Exposure at Default (“EAD”) methodologies with quantitative factors and qualitative considerations in calculation of the allowance for credit losses for collectively assessed loans. The Company uses a reasonable and supportable period of 2 years at which point loss assumptions revert back to historical loss information by means of 1 year reversion period. The ACL for the Company’s construction, credit card, and certain consumer loans is calculated based on a non-modeled approach utilizing historical loss rates to estimate losses. A non-modeled approach was chosen for these loans as fewer data points exist which could result in high levels of estimated loss volatility under a modeled approach. In aggregate, non-modeled loans represented less than 3% of the Company’s total loan portfolio as of September 30, 2021. The Company’s Economic Forecast Committee (“EFC”) reviews economic forecast scenarios that are incorporated in the Company’s ACL. The EFC reviews multiple scenarios provided to the Company by an independent third party and chooses a single scenario that best aligns with management’s expectation of future economic conditions. The forecast scenario contains certain macroeconomic variables that are incorporated into the Company’s modeling process, including GDP, unemployment rates, interest rates, and commercial real estate prices. As of September 30, 2021, the Company chose a forecast scenario that incorporates the effect of the COVID-19 pandemic and the expected economic recovery into estimates of future economic conditions. The forecast improved compared to forecasts used during the second quarter of 2021 with an overall increase in projected GDP growth and projected commercial real estate prices. The improvement to the economic forecasts reflect the current and projected effects of government stimulus packages, ongoing COVID-19 vaccinations, and the reopening of many businesses throughout the United States. Additionally, in order to systematically quantify the credit risk impact of other trends and changes within the loan portfolio, the Company utilizes qualitative adjustments to the modeled and non-modeled estimated loss approaches. The parameters for making adjustments are established under a Credit Risk Matrix that provides different possible scenarios for each of the factors below. The Credit Risk Matrix and the possible scenarios enable the Bank to qualitatively adjust the Loss Migration Ratio by as much as 25 basis points for each loan type pool. This matrix considers the following seven factors, which are patterned after the guidelines provided under the Federal Financial Institutions Examination Council (“FFIEC”) Interagency Policy Statement on the Allowance for Loan and Lease Losses, updated to reflect the adoption of CECL: • Changes in lending policies and procedures, including underwriting standards and collection, charge off, and recovery practices; • Changes in the nature and volume of the loan portfolio; • Changes in the experience, ability, and depth of lending management and staff; • Changes in the trends of the volume and severity of past due loans, classified loans, nonaccrual loans, troubled debt restructurings, and other loan modifications; • Changes in the quality of the loan review system and the degree of oversight by the Directors; • The existence and effect of any concentrations of credit and changes in the level of such concentrations; and • The effect of external factors, such as competition, legal requirements, and regulatory requirements on the level of estimated losses in the loan portfolio. For loans which do not share similar risk characteristics such as nonaccrual and TDR loans above $500 thousand, the Company evaluates these loans on an individual basis in accordance with ASC 326. These nonaccrual and TDR loans are considered to have different risk profiles than performing loans and therefore are evaluated separately. The Company decided to collectively assess TDRs and nonaccrual loans with balances below $500 thousand along with the performing and accrual loans in order to reduce the operational burden of individually assessing small TDR and nonaccrual loans with immaterial balances. For individually assessed loans, the ACL is measured using either 1) the present value of future cash flows discounted at the loan’s effective interest rate; 2) the loan’s observable market price; or 3) the fair value of the collateral, if the loan is collateral dependent. For the collateral dependent loans, the Company obtains a new appraisal to determine the fair value of collateral. The appraisals are based on an “as-is” valuation. To ensure that appraised values remain current, the Company either obtains updated appraisals every twelve months from a qualified independent appraiser or an internal evaluation of the collateral is performed by qualified personnel. If the third party market data indicates that the value of the collateral property has declined since the most recent valuation date, management adjusts the value of the property downward to reflect current market conditions. If the fair value of the collateral is less than the amortized balance of the loan, the Company recognizes an ACL with a corresponding charge to the provision for credit losses. The Company maintains a separate ACL for its off-balance sheet unfunded loan commitments. The Company uses a funding rate to allocate the allowance to undrawn exposures. This funding rate is used as a credit conversion factor to capture how much undrawn lines of credit can potentially become drawn at any point. The funding rate is determined based on a lookback period of 8 quarters. Credit loss is not estimated for off-balance sheet credit exposures that are unconditionally cancellable by the Company.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Computation of basic and diluted EPS	The following tables show the computation of basic and diluted EPS for the three and nine months ended September 30, 2021 and 2020. Three Months Ended September 30, 2021 2020 Net Income Weighted-Average Shares Earnings Net Income Weighted-Average Shares Earnings (Dollars in thousands, except share and per share data) Basic EPS - common stock $ 55,499 122,244,948 $ 0.45 $ 30,490 123,251,336 $ 0.25 Effect of dilutive securities: Stock options, restricted stock, and ESPP shares 663,588 285,429 Diluted EPS - common stock $ 55,499 122,908,536 $ 0.45 $ 30,490 123,536,765 $ 0.25 Nine Months Ended September 30, 2021 2020 Net Income Weighted-Average Shares Earnings Net Income Weighted-Average Shares Earnings (Dollars in thousands, except share and per share data) Basic EPS - common stock $ 152,949 123,050,174 $ 1.24 $ 83,196 123,581,055 $ 0.67 Effect of dilutive securities: Stock options, restricted stock, and ESPP shares 798,338 314,029 Diluted EPS - common stock $ 152,949 123,848,512 $ 1.23 $ 83,196 123,895,084 $ 0.67

Equity Investments (Tables)

Equity Investments (Tables)	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Schedule Of Change In Fair Value For Equity Investment Securities	The changes in fair value for equity investments with readily determinable fair values for the three and nine months ended September 30, 2021 and 2020 were recorded in other noninterest income and fees as summarized in the table below: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (Dollars in thousands) Net change in fair value recorded during the period on equity investments with readily determinable fair value $ (127) $ — $ (534) $ 542 Net change in fair value recorded on equity investments sold during the period — — — — Net change in fair value on equity investments with readily determinable fair values $ (127) $ — $ (534) $ 542

Securities Available for Sale (

Securities Available for Sale (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Securities, Available-for-sale [Abstract]
Summary of Securities Available for Sale	The following is a summary of securities available for sale as of the dates indicated: At September 30, 2021 Amortized Gross Gross Allowance For Fair (Dollars in thousands) Debt securities: U.S. Government agency and U.S. Government sponsored enterprises: Collateralized mortgage obligations $ 1,070,995 $ 6,471 $ (6,278) $ — $ 1,071,188 Mortgage-backed securities: Residential 771,502 2,859 (10,966) — 763,395 Commercial 581,316 13,412 (3,067) — 591,661 Asset-backed securities 118,566 98 (61) — 118,603 Corporate securities 23,410 71 (903) — 22,578 Municipal securities 100,573 1,803 (312) — 102,064 Total investment securities available for sale $ 2,666,362 $ 24,714 $ (21,587) $ — $ 2,669,489 At December 31, 2020 Amortized Gross Gross Allowance For Fair (Dollars in thousands) Debt securities: U.S. Government agency and U.S. Government sponsored enterprises: Collateralized mortgage obligations $ 990,679 $ 11,482 $ (844) $ — $ 1,001,317 Mortgage-backed securities: Residential 672,667 8,460 (114) — 681,013 Commercial 482,874 25,026 (21) — 507,879 Corporate securities 7,000 15 (881) — 6,134 Municipal securities 86,213 3,058 (3) — 89,268 Total investment securities available for sale $ 2,239,433 $ 48,041 $ (1,863) $ — $ 2,285,611
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair value of investment securities at September 30, 2021, by contractual maturity, is presented in the table below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations, with or without call or prepayment penalties. Collateralized mortgage obligations, mortgage-backed securities, and asset-backed securities are not due at a single maturity date and their total balances are shown separately. Amortized Estimated (Dollars in thousands) Available for sale: Due within one year $ — $ — Due after one year through five years 2,000 2,029 Due after five years through ten years 40,085 40,266 Due after ten years 81,898 82,347 U.S. Government agency and U.S. Government sponsored enterprises: Collateralized mortgage obligations 1,070,995 1,071,188 Mortgage-backed securities: Residential 771,502 763,395 Commercial 581,316 591,661 Asset-backed securities 118,566 118,603 Total $ 2,666,362 $ 2,669,489
Schedule of Gross Unrealized Losses and Estimated Fair Values of Investments	The following tables show the Company’s investments’ gross unrealized losses and estimated fair values, aggregated by investment category and the length of time that the individual securities have been in a continuous unrealized loss position as of the dates indicated. As of September 30, 2021 Less than 12 months 12 months or longer Total Description of Number Fair Gross Number Fair Gross Number Fair Gross (Dollars in thousands) Collateralized mortgage obligations* 32 $ 690,334 $ (6,278) — $ — $ — 32 $ 690,334 $ (6,278) Mortgage-backed securities: Residential* 60 667,345 (10,966) — — — 60 667,345 (10,966) Commercial* 21 207,216 (3,067) — — — 21 207,216 (3,067) Asset-backed securities 5 44,487 (61) — — — 5 44,487 (61) Corporate securities 4 14,115 (295) 1 4,393 (608) 5 18,508 (903) Municipal securities 12 17,832 (312) — — — 12 17,832 (312) Total 134 $ 1,641,329 $ (20,979) 1 $ 4,393 $ (608) 135 $ 1,645,722 $ (21,587) __________________________________ * Investments in U.S. Government agency and U.S. Government sponsored enterprises As of December 31, 2020 Less than 12 months 12 months or longer Total Description of Number Fair Gross Number Fair Gross Number Fair Gross (Dollars in thousands) Collateralized mortgage obligations* 22 $ 312,757 $ (844) — $ — $ — 22 $ 312,757 $ (844) Mortgage-backed securities: Residential* 8 46,094 (114) — — — 8 46,094 (114) Commercial* 1 10,275 (21) — — — 1 10,275 (21) Corporate securities — — — 1 4,119 (881) 1 4,119 (881) Municipal securities 1 997 (3) — — — 1 997 (3) Total 32 $ 370,123 $ (982) 1 $ 4,119 $ (881) 33 $ 374,242 $ (1,863) __________________________________ * Investments in U.S. Government agency and U.S. Government sponsored enterprises

Loans Receivable and Allowanc_2

Loans Receivable and Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2021
Receivables [Abstract]
Summary of Loans Receivable by Major Category	The following is a summary of loans receivable by major category: September 30, 2021 December 31, 2020 Loan portfolio composition (Dollars in thousands) Real estate loans: Residential $ 60,051 $ 54,795 Commercial 8,602,519 8,425,959 Construction 246,087 291,380 Total real estate loans 8,908,657 8,772,134 Commercial business * 3,857,879 4,157,787 Residential mortgage 599,781 582,232 Consumer and other 52,374 51,060 Loans receivable 13,418,691 13,563,213 Allowance for credit losses (136,774) (206,741) Loans receivable, net of allowance for credit losses $ 13,281,917 $ 13,356,472 __________________________________ * Commercial business loans as of September 30, 2021 and December 31, 2020 include $336.6 million and $452.7 million, respectively, in SBA Paycheck Protection Program loans
Allowance for Credit Losses by Portfolio Segment	The tables below details the activity in the allowance for credit losses by portfolio segment for the three and nine months ended September 30, 2021 and 2020. Charge offs for the three and nine months ended September 30, 2021 included $2.9 million and $14.7 million, respectively, in loan charge offs that resulted from the strategic sale of loans with elevated credit risk. There were no such sales for the three and nine months ended September 30, 2020. Charge offs for the three and nine months ended September 30, 2021 also included $10.7 million in charge offs of criticized loans that were transferred to loans held for sale during the third quarter of 2021. Accrued interest receivables on loans totaled $41.8 million at September 30, 2021 and $54.6 million at December 31, 2020. The Company set aside an allowance on loan accrued interest receivables of $320 thousand at September 30, 2021 and $1.0 million at December 31, 2020. Real Estate Commercial Business Residential Mortgage Consumer and Other Total (Dollars in thousands) Three Months Ended September 30, 2021 Balance, beginning of period $ 155,253 $ 29,500 $ 3,612 $ 1,087 $ 189,452 Provision (credit) for credit losses (9,142) (1,011) — 153 (10,000) Loans charged off (41,655) (1,895) (923) (110) (44,583) Recoveries of charge offs 1,113 778 — 14 1,905 Balance, end of period $ 105,569 $ 27,372 $ 2,689 $ 1,144 $ 136,774 Nine Months Ended September 30, 2021 Balance, beginning of period $ 162,196 $ 39,155 $ 4,227 $ 1,163 $ 206,741 Provision (credit) for credit losses (2,570) (10,565) (615) 50 (13,700) Loans charged off (56,645) (3,077) (923) (251) (60,896) Recoveries of charge offs 2,588 1,859 — 182 4,629 Balance, end of period $ 105,569 $ 27,372 $ 2,689 $ 1,144 $ 136,774 Real Estate Commercial Business Residential Mortgage Consumer and Other Total (Dollars in thousands) Three Months Ended September 30, 2020 Balance, beginning of period $ 119,030 $ 35,493 $ 5,868 $ 1,380 $ 161,771 Provision (credit) for credit losses 15,748 7,265 (1,169) 156 22,000 Loans charged off (5,313) (800) — (237) (6,350) Recoveries of charge offs 159 2,251 — 18 2,428 Balance, end of period $ 129,624 $ 44,209 $ 4,699 $ 1,317 $ 179,849 Nine Months Ended September 30, 2020 Balance, beginning of period $ 53,593 $ 33,032 $ 5,925 $ 1,594 $ 94,144 CECL day 1 adoption 27,791 (1,022) (543) (26) 26,200 Provision (credit) for credit losses 55,773 11,663 (683) 747 67,500 Loans charged off (7,884) (4,294) — (1,033) (13,211) Recoveries of charge offs 351 4,830 — 35 5,216 Balance, end of period $ 129,624 $ 44,209 $ 4,699 $ 1,317 $ 179,849 The following tables break out the allowance for credit losses and loan balance by measurement methodology at September 30, 2021 and December 31, 2020: September 30, 2021 Real Estate Commercial Business Residential Mortgage Consumer and Other Total (Dollars in thousands) Allowance for credit losses: Individually evaluated $ 3,025 $ 3,376 $ 9 $ 27 $ 6,437 Collectively evaluated 102,544 23,996 2,680 1,117 130,337 Total $ 105,569 $ 27,372 $ 2,689 $ 1,144 $ 136,774 Loans outstanding: Individually evaluated $ 72,776 $ 19,660 $ 1,599 $ 261 $ 94,296 Collectively evaluated 8,835,881 3,838,219 598,182 52,113 13,324,395 Total $ 8,908,657 $ 3,857,879 $ 599,781 $ 52,374 $ 13,418,691 December 31, 2020 Real Estate Commercial Business Residential Mortgage Consumer and Other Total (Dollars in thousands) Allowance for credit losses: Individually evaluated $ 3,683 $ 3,575 $ 25 $ 42 $ 7,325 Collectively evaluated 158,513 35,580 4,202 1,121 199,416 Total $ 162,196 $ 39,155 $ 4,227 $ 1,163 $ 206,741 Loans outstanding: Individually evaluated $ 93,476 $ 25,706 $ 3,416 $ 605 $ 123,203 Collectively evaluated 8,678,658 4,132,081 578,816 50,455 13,440,010 Total $ 8,772,134 $ 4,157,787 $ 582,232 $ 51,060 $ 13,563,213 The following tables present a breakdown of loans by recorded ACL, broken out by loans evaluated individually and collectively at September 30, 2021 and December 31, 2020: As of September 30, 2021 Real Estate – Real Estate – Real Estate – Commercial Residential Consumer Total (Dollars in thousands) Individually evaluated loans $ — $ 72,776 $ — $ 19,660 $ 1,599 $ 261 $ 94,296 ACL on individually evaluated loans $ — $ 3,025 $ — $ 3,376 $ 9 $ 27 $ 6,437 Individually evaluated loans ACL coverage N/A 4.16 % N/A 17.17 % 0.56 % 10.34 % 6.83 % Collectively evaluated loans $ 60,051 $ 8,529,743 $ 246,087 $ 3,838,219 $ 598,182 $ 52,113 $ 13,324,395 ACL on collectively evaluated loans $ 371 $ 100,536 $ 1,637 $ 23,996 $ 2,680 $ 1,117 $ 130,337 Collectively evaluated loans ACL coverage 0.62 % 1.18 % 0.67 % 0.63 % 0.45 % 2.14 % 0.98 % Total loans $ 60,051 $ 8,602,519 $ 246,087 $ 3,857,879 $ 599,781 $ 52,374 $ 13,418,691 Total ACL $ 371 $ 103,561 $ 1,637 $ 27,372 $ 2,689 $ 1,144 $ 136,774 Total ACL to total loans 0.62 % 1.20 % 0.67 % 0.71 % 0.45 % 2.18 % 1.02 % As of December 31, 2020 Real Estate – Real Estate – Real Estate – Commercial Residential Consumer Total (Dollars in thousands) Individually evaluated loans $ — $ 74,753 $ 18,723 $ 25,706 $ 3,416 $ 605 $ 123,203 ACL on individually evaluated loans $ — $ 2,862 $ 821 $ 3,575 $ 25 $ 42 $ 7,325 Individually evaluated loans ACL coverage N/A 3.83 % 4.38 % 13.91 % 0.73 % 6.94 % 5.95 % Collectively evaluated loans $ 54,795 $ 8,351,206 $ 272,657 $ 4,132,081 $ 578,816 $ 50,455 $ 13,440,010 ACL on collectively evaluated loans $ 391 $ 156,665 $ 1,457 $ 35,580 $ 4,202 $ 1,121 $ 199,416 Collectively evaluated loans ACL coverage 0.71 % 1.88 % 0.53 % 0.86 % 0.73 % 2.22 % 1.48 % Total loans $ 54,795 $ 8,425,959 $ 291,380 $ 4,157,787 $ 582,232 $ 51,060 $ 13,563,213 Total ACL $ 391 $ 159,527 $ 2,278 $ 39,155 $ 4,227 $ 1,163 $ 206,741 Total ACL to total loans 0.71 % 1.89 % 0.78 % 0.94 % 0.73 % 2.28 % 1.52 %
Schedule of Nonaccrual Loans and Loans Past Due 90 or More Days And Still on Accrual Status	The tables below represent the recorded investment of nonaccrual loans and loans past due 90 or more days and still on accrual status by class of loans and broken out by loans with a recorded ACL and those without a recorded ACL as of September 30, 2021 and December 31, 2020. September 30, 2021 Nonaccrual with No ACL Nonaccrual with an ACL Total Nonaccrual (1) Accruing Loans Past Due 90 or More Days (Dollars in thousands) Real estate – residential $ — $ — $ — $ — Real estate – commercial Retail 4,542 2,831 7,373 — Hotel & motel 4,241 9,576 13,817 — Gas station & car wash 575 1,433 2,008 — Mixed use — 6,954 6,954 1,704 Industrial & warehouse 2,013 2,314 4,327 — Other 888 6,306 7,194 1,889 Real estate – construction — — — — Commercial business 4,951 6,040 10,991 500 Residential mortgage — 1,599 1,599 392 Consumer and other — 117 117 82 Total $ 17,210 $ 37,170 $ 54,380 $ 4,567 December 31, 2020 Nonaccrual with No ACL Nonaccrual with an ACL Total Nonaccrual (1) Accruing Loans Past Due 90 or More Days (Dollars in thousands) Real estate – residential $ — $ — $ — $ — Real estate – commercial Retail 3,262 8,530 11,792 478 Hotel & motel 15,311 2,195 17,506 — Gas station & car wash 151 1,493 1,644 — Mixed use 1,883 788 2,671 — Industrial & warehouse 5,443 1,022 6,465 — Other 7,230 1,419 8,649 — Real estate – construction — 18,723 18,723 — Commercial business 5,319 8,592 13,911 — Residential mortgage 1,440 1,976 3,416 — Consumer and other — 461 461 136 Total $ 40,039 $ 45,199 $ 85,238 $ 614 __________________________________ (1) Total nonaccrual loans exclude the guaranteed portion of SBA loans that are in liquidation totaling $20.6 million
Amortized Cost Basis of Collateral-Dependent Loans	The following table presents the amortized cost basis of collateral-dependent loans as of September 30, 2021 and December 31, 2020: September 30, 2021 Real Estate Collateral Other Collateral Total (Dollars in thousands) Real estate – residential $ — $ — $ — Real estate – commercial 44,061 — 44,061 Real estate – construction — — — Commercial business 1,992 6,463 8,455 Residential mortgage — — — Consumer and other — — — Total $ 46,053 $ 6,463 $ 52,516 December 31, 2020 Real Estate Collateral Other Collateral Total (Dollars in thousands) Real estate – residential $ — $ — $ — Real estate – commercial 55,945 — 55,945 Real estate – construction 8,122 — 8,122 Commercial business 7,818 6,312 14,130 Residential mortgage 1,440 — 1,440 Consumer and other 15 — 15 Total $ 73,340 $ 6,312 $ 79,652
Aging of Past Due Loans	The following table presents the recorded investment of past due loans, including nonaccrual loans past due 30 or more days, by the number of days past due as of September 30, 2021 and December 31, 2020 by class of loans: As of September 30, 2021 As of December 31, 2020 30-59 Days 60-89 Days 90 or More Days Total 30-59 Days 60-89 Days 90 or More Days Total (Dollars in thousands) Real estate – residential $ — $ — $ — $ — $ — $ — $ — $ — Real estate – commercial Retail 2,364 3,354 4,336 10,054 852 8,141 10,276 19,269 Hotel & motel 425 1,522 9,615 11,562 62 1,401 14,744 16,207 Gas station & car wash — — 607 607 619 2,668 563 3,850 Mixed use 1,037 5,307 2,225 8,569 116 — 1,269 1,385 Industrial & warehouse 145 2,110 2,453 4,708 137 — 3,830 3,967 Other 2,034 1,235 3,838 7,107 2,738 545 3,000 6,283 Real estate – construction — — — — 8,122 — — 8,122 Commercial business 9,241 233 8,411 17,885 816 3,683 4,700 9,199 Residential mortgage 195 — 1,322 1,517 4,841 — 2,263 7,104 Consumer and other 28 15 82 125 797 21 595 1,413 Total Past Due $ 15,469 $ 13,776 $ 32,889 $ 62,134 $ 19,100 $ 16,459 $ 41,240 $ 76,799
Financing Receivable Credit Quality Indicators	The following table presents the amortized cost basis of loans receivable by class, credit quality indicator, and year of origination as of September 30, 2021 and December 31, 2020. As of September 30, 2021 Term Loan by Origination Year Revolving Loans Total 2021 2020 2019 2018 2017 Prior (Dollars in thousands) Real Estate - Residential Pass / not rated $ 16,184 $ 11,789 $ 11,747 $ 5,514 $ 3,796 $ 8,017 $ 2,281 $ 59,328 Special mention — — — — — 361 228 589 Substandard — — — 134 — — — 134 Doubtful / loss — — — — — — — — Subtotal $ 16,184 $ 11,789 $ 11,747 $ 5,648 $ 3,796 $ 8,378 $ 2,509 $ 60,051 Real Estate - Commercial Pass / not rated $ 1,738,636 $ 1,452,247 $ 1,280,364 $ 1,318,119 $ 965,008 $ 1,314,555 $ 101,893 $ 8,170,822 Special mention 6,357 8,263 49,900 19,138 46,715 79,561 5,971 215,905 Substandard 6,479 877 15,852 29,462 43,805 119,317 — 215,792 Doubtful / loss — — — — — — — — Subtotal $ 1,751,472 $ 1,461,387 $ 1,346,116 $ 1,366,719 $ 1,055,528 $ 1,513,433 $ 107,864 $ 8,602,519 Real Estate - Construction Pass / not rated $ 7,048 $ 59,503 $ 29,414 $ 40,788 $ 25,912 $ 15,983 $ 10,794 $ 189,442 Special mention — — — 45,950 4,708 5,987 — 56,645 Substandard — — — — — — — — Doubtful / loss — — — — — — — — Subtotal $ 7,048 $ 59,503 $ 29,414 $ 86,738 $ 30,620 $ 21,970 $ 10,794 $ 246,087 Commercial Business Pass / not rated $ 1,193,990 $ 545,116 $ 452,416 $ 138,691 $ 75,851 $ 82,834 $ 1,309,437 $ 3,798,335 Special mention 1,134 401 13,667 1,469 3,242 10,343 3,371 33,627 Substandard 1,665 1,150 1,764 1,999 4,818 5,650 8,871 25,917 Doubtful / loss — — — — — — — — Subtotal $ 1,196,789 $ 546,667 $ 467,847 $ 142,159 $ 83,911 $ 98,827 $ 1,321,679 $ 3,857,879 Residential Mortgage Pass / not rated $ 253,561 $ 3,824 $ 45,251 $ 140,682 $ 95,657 $ 59,206 $ — $ 598,181 Special mention — — — — — — — — Substandard — — 128 195 541 736 — 1,600 Doubtful / loss — — — — — — — — Subtotal $ 253,561 $ 3,824 $ 45,379 $ 140,877 $ 96,198 $ 59,942 $ — $ 599,781 Consumer and Other Pass / not rated $ 12,153 $ 5,671 $ 1,868 $ 1,670 $ 1,901 $ 7,512 $ 21,358 $ 52,133 Special mention — — — — — — — — Substandard — — — — — 241 — 241 Doubtful / loss — — — — — — — — Subtotal $ 12,153 $ 5,671 $ 1,868 $ 1,670 $ 1,901 $ 7,753 $ 21,358 $ 52,374 Total Loans Pass / not rated $ 3,221,572 $ 2,078,150 $ 1,821,060 $ 1,645,464 $ 1,168,125 $ 1,488,107 $ 1,445,763 $ 12,868,241 Special mention 7,491 8,664 63,567 66,557 54,665 96,252 9,570 306,766 Substandard 8,144 2,027 17,744 31,790 49,164 125,944 8,871 243,684 Doubtful / loss — — — — — — — — Total $ 3,237,207 $ 2,088,841 $ 1,902,371 $ 1,743,811 $ 1,271,954 $ 1,710,303 $ 1,464,204 $ 13,418,691 December 31, 2020 Term Loan by Origination Year Revolving Loans Total 2020 2019 2018 2017 2016 Prior (Dollars in thousands) Real Estate - Residential Pass / not rated $ 15,158 $ 13,924 $ 7,587 $ 4,316 $ 6,800 $ 3,460 $ 3,104 $ 54,349 Special mention — — — — — — 227 227 Substandard — — 139 — — 80 — 219 Doubtful / loss — — — — — — — — Subtotal $ 15,158 $ 13,924 $ 7,726 $ 4,316 $ 6,800 $ 3,540 $ 3,331 $ 54,795 Real Estate - Commercial Pass / not rated $ 1,548,595 $ 1,554,980 $ 1,533,802 $ 1,240,973 $ 767,318 $ 1,262,125 $ 130,595 $ 8,038,388 Special mention — 2,805 24,569 10,694 8,031 32,048 1,600 79,747 Substandard 126 14,233 28,938 37,174 50,371 173,788 3,194 307,824 Doubtful / loss — — — — — — — — Subtotal $ 1,548,721 $ 1,572,018 $ 1,587,309 $ 1,288,841 $ 825,720 $ 1,467,961 $ 135,389 $ 8,425,959 Real Estate - Construction Pass / not rated $ 35,743 $ 45,290 $ 103,794 $ 60,996 $ 5,740 $ 10,099 $ — $ 261,662 Special mention — — — — 5,771 5,224 — 10,995 Substandard — — — 10,601 — 8,122 — 18,723 Doubtful / loss — — — — — — — — Subtotal $ 35,743 $ 45,290 $ 103,794 $ 71,597 $ 11,511 $ 23,445 $ — $ 291,380 Commercial Business Pass / not rated $ 1,294,368 $ 584,453 $ 224,447 $ 117,708 $ 77,209 $ 43,674 $ 1,686,428 $ 4,028,287 Special mention 5,996 27,693 30,852 14,629 6,388 3,139 5,172 93,869 Substandard 2,430 1,323 5,539 4,394 6,158 5,463 10,323 35,630 Doubtful / loss — — 1 — — — — 1 Subtotal $ 1,302,794 $ 613,469 $ 260,839 $ 136,731 $ 89,755 $ 52,276 $ 1,701,923 $ 4,157,787 Residential Mortgage Pass / not rated $ 5,733 $ 90,958 $ 217,343 $ 168,827 $ 55,246 $ 40,554 $ — $ 578,661 Special mention — — — — — — — — Substandard — 122 536 561 1,715 637 — 3,571 Doubtful / loss — — — — — — — — Subtotal $ 5,733 $ 91,080 $ 217,879 $ 169,388 $ 56,961 $ 41,191 $ — $ 582,232 Consumer and Other Pass / not rated $ 8,309 $ 2,463 $ 1,818 $ 2,321 $ 4,756 $ 2,811 $ 27,890 $ 50,368 Special mention — — — 103 — — — 103 Substandard — — — — 55 532 2 589 Doubtful / loss — — — — — — — — Subtotal $ 8,309 $ 2,463 $ 1,818 $ 2,424 $ 4,811 $ 3,343 $ 27,892 $ 51,060 Total Loans Pass / not rated $ 2,907,906 $ 2,292,068 $ 2,088,791 $ 1,595,141 $ 917,069 $ 1,362,723 $ 1,848,017 $ 13,011,715 Special mention 5,996 30,498 55,421 25,426 20,190 40,411 6,999 184,941 Substandard 2,556 15,678 35,152 52,730 58,299 188,622 13,519 366,556 Doubtful / loss — — 1 — — — — 1 Total $ 2,916,458 $ 2,338,244 $ 2,179,365 $ 1,673,297 $ 995,558 $ 1,591,756 $ 1,868,535 $ 13,563,213
Loans Sold From Loans Held For Investment	The breakdown of loans by type that were reclassified from held for investment to held for sale for the three and nine months ended September 30, 2021 and 2020 is presented in the following table: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Transfer of loans held for investment to held for sale (Dollars in thousands) Real estate - commercial $ 107,191 $ — $ 278,366 $ — Commercial business 78,990 — 88,650 — Residential mortgage 7,018 — 7,018 1,002 Total $ 193,199 $ — $ 374,034 $ 1,002
Troubled Debt Restructurings	A summary of the recorded investment of TDR loans on accrual and nonaccrual status by type of concession as of September 30, 2021 and December 31, 2020 is presented below: As of September 30, 2021 TDR Loans on Accrual Status TDR Loans on Nonaccrual Status Total TDRs Real Estate Commercial Business Residential Mortgage Other Real Estate Commercial Business Residential Mortgage Other (Dollars in thousands) Payment concession $ 8,034 $ 808 $ — $ 55 $ 9,145 $ 473 $ — $ — $ 18,515 Maturity / amortization concession 17,567 7,275 — 158 285 3,257 — 117 28,659 Rate concession 5,254 358 — — 244 1,417 — — 7,273 Total $ 30,855 $ 8,441 $ — $ 213 $ 9,674 $ 5,147 $ — $ 117 $ 54,447 As of December 31, 2020 TDR Loans on Accrual Status TDR Loans on Nonaccrual Status Total Real Estate Commercial Business Residential Mortgage Other Real Estate Commercial Business Residential Mortgage Other (Dollars in thousands) Payment concession $ 8,328 $ 814 $ — $ 58 $ 7,074 $ 471 $ — $ — $ 16,745 Maturity / amortization concession 11,331 10,219 — 114 925 3,814 — 117 26,520 Rate concession 6,112 378 — — 424 1,430 — — 8,344 Total $ 25,771 $ 11,411 $ — $ 172 $ 8,423 $ 5,715 $ — $ 117 $ 51,609 The following tables present the recorded investment of loans classified as TDR during the three and nine months ended September 30, 2021 and 2020 by class of loans: Three Months Ended September 30, 2021 Three Months Ended September 30, 2020 Number of Loans Balance Number of Loans Balance (Dollars in thousands) Real estate – residential — $ — — $ — Real estate – commercial Retail — — 1 1,007 Hotel & motel — — — — Gas station & car wash — — — — Mixed use — — 1 767 Industrial & warehouse — — — — Other — — — — Real estate – construction — — — — Commercial business — — — — Residential mortgage — — — — Consumer and other — — 2 11 Total — $ — 4 $ 1,785 Nine Months Ended September 30, 2021 Nine Months Ended September 30, 2021 Number of Loans Balance Number of Loans Balance (Dollars in thousands) Real estate – residential — $ — — $ — Real estate – commercial Retail 4 6,922 2 1,613 Hotel & motel — — — — Gas station & car wash 1 575 2 515 Mixed use 1 4,626 2 1,233 Industrial & warehouse — — 1 259 Other — — — — Real estate – construction — — — — Commercial business 3 319 2 481 Residential mortgage — — — — Consumer and other 5 53 6 34 Total 14 $ 12,495 15 $ 4,135
Summary of Troubled Debt Restructurings with Subsequent Payment Default	The following tables present loans modified as TDRs within the previous twelve months ended September 30, 2021 and 2020 that subsequently had payment defaults during the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, 2021 Three Months Ended September 30, 2020 Number of Loans Balance Number of Loans Balance (Dollars in thousands) Real estate – residential — $ — — $ — Real estate – commercial Retail 4 6,988 1 606 Hotel & motel — — — — Gas station & car wash — — — — Mixed Use 1 4,626 — — Industrial & warehouse — — 1 2,326 Other — — 1 133 Real estate – construction — — — — Commercial business — — — — Residential mortgage — — — — Consumer and other 3 30 4 20 Total 8 $ 11,644 7 $ 3,085 Nine Months Ended September 30, 2021 Nine Months Ended September 30, 2020 Number of Loans Balance Number of Loans Balance (Dollars in thousands) Real estate – residential — $ — — $ — Real estate – commercial Retail 4 6,988 1 606 Hotel & motel — — — — Gas station & car wash — — 1 471 Mixed Use 1 4,626 1 466 Industrial & warehouse — — 2 2,586 Other — — 1 133 Real estate – construction — — — — Commercial business 1 120 1 14 Residential mortgage — — — — Consumer and other 4 41 5 24 Total 10 $ 11,775 12 $ 4,300

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Summary of Net Lease Cost and Other Information	The table below summarizes the Company’s net lease cost: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (Dollars in thousands) Operating lease cost $ 3,778 $ 3,928 $ 11,498 $ 11,752 Short term lease cost — — — — Variable lease cost 892 864 2,393 2,403 Sublease income (102) (169) (354) (595) Net lease cost $ 4,568 $ 4,623 $ 13,537 $ 13,560 The table below summarizes other information related to the Company’s operating leases: At or for the Nine Months Ended At or for the Nine Months Ended (Dollars in thousands) Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows for operating leases $ 10,991 $ 11,320 Right-of-use assets obtained in exchange for lease liabilities, net 965 — Weighted-average remaining lease term - operating leases 5.4 years 5.3 years Weighted-average discount rate - operating leases 2.56 % 2.99 %
Summary of Maturity of Remaining Lease Liabilities	The table below summarizes the maturity of remaining lease liabilities: September 30, 2021 (Dollars in thousands) 2021 $ 3,694 2022 12,704 2023 10,942 2024 9,335 2025 7,634 2026 and thereafter 14,853 Total lease payments 59,162 Less: imputed interest 4,067 Total lease obligations $ 55,095

Financial Services, Banking and

Financial Services, Banking and Thrift (Tables)	9 Months Ended
	Sep. 30, 2021
Deposits [Abstract]
Schedule of Deposits	The following is a breakdown of the Company’s deposits at September 30, 2021 and December 31, 2020: At September 30, 2021 At December 31, 2020 Balance Percentage (%) Balance Percentage (%) (Dollars in thousands) Noninterest bearing demand deposits $ 6,007,586 40 % $ 4,814,254 34 % Money market and NOW accounts 5,871,567 39 % 5,232,413 36 % Saving deposits 314,603 2 % 300,770 2 % Time deposits 2,868,771 19 % 3,986,475 28 % Total deposits $ 15,062,527 100 % $ 14,333,912 100 %

Borrowings (Tables)

Borrowings (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Contractual Maturities for FHLB-SF Borrowings	At September 30, 2021, the contractual maturities for outstanding FHLB advances were as follows: September 30, 2021 Scheduled maturities in: (Dollars in thousands) 2021 $ 100,000 2022 100,000 Total $ 200,000

Subordinated Debentures and C_2

Subordinated Debentures and Convertible Notes (Tables)	9 Months Ended
	Sep. 30, 2021
Subordinated Borrowings [Abstract]
Summary of Trust Preferred Securities and Debentures	The following table is a summary of trust preferred securities and Debentures at September 30, 2021: Issuance Trust Issuance Date Trust Preferred Security Amount Carrying Value of Debentures Rate Type Current Rate Maturity Date (Dollars in thousands) Nara Capital Trust III 06/05/2003 $ 5,000 $ 5,155 Variable 3.266% 06/15/2033 Nara Statutory Trust IV 12/22/2003 5,000 5,155 Variable 2.976% 01/07/2034 Nara Statutory Trust V 12/17/2003 10,000 10,310 Variable 3.070% 12/17/2033 Nara Statutory Trust VI 03/22/2007 8,000 8,248 Variable 1.766% 06/15/2037 Center Capital Trust I 12/30/2003 18,000 14,631 Variable 2.976% 01/07/2034 Wilshire Trust II 03/17/2005 20,000 16,140 Variable 1.910% 03/17/2035 Wilshire Trust III 09/15/2005 15,000 11,471 Variable 1.516% 09/15/2035 Wilshire Trust IV 07/10/2007 25,000 18,555 Variable 1.496% 09/15/2037 Saehan Capital Trust I 03/30/2007 20,000 15,392 Variable 1.752% 06/30/2037 Total $ 126,000 $ 105,057
Convertible Debt	The value of the convertible note at issuance and the carrying value as of September 30, 2021 and December 31, 2020 are presented in the tables below: As of September 30, 2021 Amortization/ Gross Accumulated Carrying Amount (Dollars in thousands) Convertible notes principal balance $ 217,500 $ — $ 217,500 Issuance costs to be capitalized 5 years (4,119) 2,593 (1,526) Carrying balance of convertible notes $ 213,381 $ 2,593 $ 215,974 As of December 31, 2020 Amortization/ Gross Accumulated Carrying Amount (Dollars in thousands) Convertible notes principal balance $ 217,500 $ — $ 217,500 Discount 5 years (21,880) 10,951 (10,929) Issuance costs to be capitalized 5 years (4,119) 2,113 (2,006) Carrying balance of convertible notes $ 191,501 $ 13,064 $ 204,565

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Swaps Related to Hedging Program	At September 30, 2021 and December 31, 2020, interest rate swaps related to the Company’s loan hedging program that were outstanding are presented in the following table: September 30, 2021 December 31, 2020 (Dollars in thousands) Interest rate swaps on loans with correspondent banks (included in other assets) Notional amount $ 98,916 $ — Weighted average remaining term (years) 8.6 0.0 Pay fixed rate (weighted average) 2.90 % — % Received variable rate (weighted average) 2.10 % — % Estimated fair value $ 2,395 $ — Interest rate swaps on loans with correspondent banks (included in other liabilities) Notional amount $ 453,289 $ 503,929 Weighted average remaining term (years) 5.8 6.8 Pay fixed rate (weighted average) 3.97 % 3.86 % Received variable rate (weighted average) 2.18 % 2.26 % Estimated fair value $ (18,802) $ (34,606) Back to back interest rate swaps with loan customers (included in other liabilities) Notional amount $ 98,916 $ — Weighted average remaining term (years) 8.6 0.0 Received fixed rate (weighted average) 2.90 % — % Pay variable rate (weighted average) 2.10 % — % Estimated fair value $ (2,395) $ — Back to back interest rate swaps with loan customers (included in other assets) Notional amount $ 453,289 $ 503,929 Weighted average remaining term (years) 5.8 6.8 Received fixed rate (weighted average) 3.97 % 3.86 % Pay variable rate (weighted average) 2.18 % 2.26 % Estimated fair value $ 18,802 $ 34,606
Schedule of Derivative Instruments	September 30, 2021 December 31, 2020 (Dollars in thousands) Interest rate swaps designated as cash flow hedge (included in other assets) Notional amount $ 100,000 $ — Weighted average remaining term (years) 3.5 0.0 Received variable rate (weighted average) 0.14 % — % Pay fixed rate (weighted average) 0.49 % — % Estimated fair value $ 1,041 $ — Interest rate swaps designated as cash flow hedge (included in other liabilities) Notional amount $ — $ 100,000 Weighted average remaining term (years) 0.0 4.3 Received variable rate (weighted average) — % 0.22 % Pay fixed rate (weighted average) — % 0.49 % Estimated fair value $ — $ (602) The following table reflects the notional amount and fair value of mortgage banking derivatives for the dates indicated: As of September 30, 2021 As of December 31, 2020 Notional Amount Fair Value Notional Amount Fair Value (Dollars in thousands) Assets: Interest rate lock commitments $ 22,479 $ 256 $ 37,507 $ 679 Forward sale contracts related to mortgage banking 21,394 98 8,641 45 Liabilities: Interest rate lock commitments $ 450 $ (1) $ 6,267 $ (31) Forward sale contracts related to mortgage banking 5,693 (23) 35,133 (79)

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments	Commitments at September 30, 2021 and December 31, 2020 are summarized as follows: September 30, 2021 December 31, 2020 (Dollars in thousands) Commitments to extend credit $ 2,373,741 $ 2,137,178 Standby letters of credit 117,132 108,834 Other letters of credit 55,897 40,508 Commitments to fund investments in affordable housing partnerships 10,286 15,148

Goodwill, Intangible Assets, _2

Goodwill, Intangible Assets, and Servicing Assets (Tables)	9 Months Ended
	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	The following table provides information regarding the core deposit intangibles at September 30, 2021 and December 31, 2020: As of September 30, 2021 As of December 31, 2020 Core Deposit Intangibles Related To: Amortization Period Gross Accumulated Carrying Amount Accumulated Carrying Amount (Dollars in thousands) Foster Bankshares acquisition 10 years $ 2,763 $ (2,459) $ 304 $ (2,322) $ 441 Wilshire Bancorp acquisition 10 years 18,138 (10,262) 7,876 (8,871) 9,267 Total $ 20,901 $ (12,721) $ 8,180 $ (11,193) $ 9,708
Schedule of Servicing Assets	The changes in servicing assets for the three and nine months ended September 30, 2021 and 2020 were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (Dollars in thousands) Balance at beginning of period $ 11,566 $ 14,164 $ 12,692 $ 16,417 Additions through originations of servicing assets 710 1,190 2,039 2,326 Amortization (1,489) (1,636) (3,944) (5,025) Balance at end of period $ 10,787 $ 13,718 $ 10,787 $ 13,718
Summary of Fair Value Inputs	The inputs used in evaluating servicing assets for impairment at September 30, 2021 and December 31, 2020 are presented below. September 30, 2021 December 31, 2020 SBA Servicing Assets: Weighted-average discount rate 12.48% 9.93% Constant prepayment rate 14.37% 14.40% Mortgage Servicing Assets: Weighted-average discount rate 8.63% 8.26% Constant prepayment rate 9.19% 8.63%

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on a Recurring Basis	Assets and liabilities measured at fair value on a recurring basis are summarized below: Fair Value Measurements at the End of September 30, 2021 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Securities available for sale: U.S. Government agency and U.S. Government sponsored enterprises: Collateralized mortgage obligations $ 1,071,188 $ — $ 1,071,188 $ — Mortgage-backed securities: Residential 763,395 — 763,395 — Commercial 591,661 — 591,661 — Asset-backed securities 118,603 — 118,603 — Corporate securities 22,578 — 22,578 — Municipal securities 102,064 — 101,009 1,055 Equity investments with readily determinable fair value 27,077 27,077 — — Interest rate swaps 21,197 — 21,197 — Mortgage banking derivatives 354 — 354 — Other derivatives 1,041 — 1,041 — Liabilities: Interest rate swaps 21,197 — 21,197 — Mortgage banking derivatives 24 — 24 — Other derivatives 52 — — 52 Fair Value Measurements at the End of December 31, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Securities available for sale: U.S. Government agency and U.S. Government sponsored enterprises: Collateralized mortgage obligations $ 1,001,317 $ — $ 1,001,317 $ — Mortgage-backed securities: Residential 681,013 — 681,013 — Commercial 507,879 — 507,879 — Corporate securities 6,134 — 6,134 — Municipal securities 89,268 — 88,246 1,022 Equity investments with readily determinable fair value 27,611 27,611 — — Interest rate swaps 34,606 — 34,606 — Mortgage banking derivatives 724 — 724 — Liabilities: Interest rate swaps 34,606 — 34,606 — Mortgage banking derivatives 110 — 110 — Other derivatives 1,000 — 602 398
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The table below presents a reconciliation and income statement classification of gains (losses) for our municipal security and risk participation agreements measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three and nine months ended September 30, 2021 and 2020: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (Dollars in thousands) Municipal securities: Beginning Balance $ 1,058 $ 1,066 $ 1,022 $ 1,076 Change in fair value included in other comprehensive income (loss) (3) (18) 33 (28) Ending Balance $ 1,055 $ 1,048 $ 1,055 $ 1,048 Risk participation agreements: Beginning Balance $ 64 $ 223 $ 398 $ — Change in fair value included in income (12) (24) (346) 199 Ending Balance $ 52 $ 199 $ 52 $ 199
Assets Measured at Fair Value on a Non-recurring Basis	Assets measured at fair value on a non-recurring basis are summarized below: Fair Value Measurements at the End of September 30, 2021 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Collateral dependent loans at fair value: Real estate loans $ 12,882 $ — $ — $ 12,882 Commercial business 3,504 — — 3,504 Loans held for sale, net 131,176 — 131,176 — OREO 14,783 — — 14,783 Fair Value Measurements at the End of December 31, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Collateral dependent loans at fair value: Real estate loans $ 21,688 $ — $ — $ 21,688 Commercial business 7,694 — — 7,694 Loans held for sale, net — — — — OREO 19,260 — — 19,260 For assets measured at fair value on a non-recurring basis, the total net losses, which include charge offs, recoveries, recorded ACL, valuations, and recognized gains and losses on sales are summarized below: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2021 2020 2021 2020 (Dollars in thousands) Assets: Collateral dependent loans at fair value: Real estate loans $ (1,083) $ (5,951) $ (1,496) $ (8,108) Commercial business (2,025) (2,902) (2,025) (5,470) Loans held for sale, net (6,121) — (17,900) — OREO (259) (1,682) (582) (4,118)
Carrying Amounts and Estimated Fair Values of Financial Instruments	Carrying amounts and estimated fair values of financial instruments, not previously presented, at September 30, 2021 and December 31, 2020 were as follows: September 30, 2021 Carrying Amount Estimated Fair Value Fair Value Measurement (Dollars in thousands) Financial Assets: Cash and cash equivalents $ 627,352 $ 627,352 Level 1 Interest bearing deposits in other financial institutions 12,340 12,348 Level 2 Equity investments without readily determinable fair values 31,435 31,435 Level 2 Loans held for sale 179,117 181,836 Level 2 Loans receivable—net 13,281,917 13,155,789 Level 3 Accrued interest receivable 47,102 47,102 Level 2/3 Servicing assets, net 10,787 13,494 Level 3 Customers’ liabilities on acceptances 1,808 1,808 Level 2 Financial Liabilities: Noninterest bearing deposits $ 6,007,586 $ 6,007,586 Level 2 Saving and other interest bearing demand deposits 6,186,170 6,186,170 Level 2 Time deposits 2,868,771 2,871,600 Level 2 FHLB advances 200,000 202,719 Level 2 Convertible notes, net 215,974 215,325 Level 1 Subordinated debentures 105,057 114,854 Level 2 Accrued interest payable 5,367 5,367 Level 2 Acceptances outstanding 1,808 1,808 Level 2 December 31, 2020 Carrying Amount Estimated Fair Value Fair Value Measurement (Dollars in thousands) Financial Assets: Cash and cash equivalents $ 350,579 $ 350,579 Level 1 Interest bearing deposits in other financial institutions 28,642 28,669 Level 2 Equity investments without readily determinable fair values 32,088 32,088 Level 2 Loans held for sale 17,743 18,288 Level 2 Loans receivable—net 13,356,472 13,428,706 Level 3 Accrued interest receivable 59,430 59,430 Level 2/3 Servicing assets, net 12,692 15,785 Level 3 Customers’ liabilities on acceptances 1,184 1,184 Level 2 Financial Liabilities: Noninterest bearing deposits $ 4,814,254 $ 4,814,254 Level 2 Saving and other interest bearing demand deposits 5,533,183 5,533,183 Level 2 Time deposits 3,986,475 3,992,973 Level 2 FHLB advances 250,000 254,456 Level 2 Convertible notes, net 204,565 201,731 Level 1 Subordinated debentures 104,178 98,948 Level 2 Accrued interest payable 14,706 14,706 Level 2 Acceptances outstanding 1,184 1,184 Level 2

Stockholders_ Equity (Tables)

Stockholders’ Equity (Tables)	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table presents the quarterly changes to accumulated other comprehensive income for the three and nine months ended September 30, 2021 and 2020: Three Months Ended, Nine Months Ended, September 30, 2021 September 30, 2020 September 30, 2021 September 30, 2020 (Dollars in thousands) Balance at beginning of period $ 15,051 $ 38,149 $ 32,753 $ 9,149 Unrealized net gains (losses) on securities available for sale (16,433) (303) (43,050) 41,820 Unrealized net gains (losses) on interest rate swaps used for cash flow hedge 120 54 1,643 (796) Reclassification adjustments for net losses (gains) realized in net income 88 (7,510) 227 (7,649) Tax effect 4,717 2,292 11,970 (9,842) Other comprehensive income (loss), net of tax (11,508) (5,467) (29,210) 23,533 Balance at end of period $ 3,543 $ 32,682 $ 3,543 $ 32,682

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Summary of Stock Option Activity Under the Plan	The following is a summary of the Company’s stock option activity for the nine months ended September 30, 2021: Number of Shares Weighted-Average Exercise Price Per Share Weighted-Average Aggregate Intrinsic Value (Dollars in thousands) Outstanding - January 1, 2021 851,580 $ 15.25 Granted — — Exercised — — Expired (16,703) 17.12 Forfeited — — Outstanding - September 30, 2021 834,877 $ 15.22 3.66 $ 1,011 Options exercisable - September 30, 2021 834,877 $ 15.22 3.66 $ 1,011
Summary of Restricted Stock and Performance Unit Activity Under the Plan	The following is a summary of the Company’s restricted stock and performance unit activity for the nine months ended September 30, 2021: Number of Shares Weighted-Average Grant Date Fair Value Outstanding (unvested) - January 1, 2021 1,718,838 $ 10.73 Granted 666,163 15.61 Vested (622,003) 11.89 Forfeited (164,530) 13.13 Outstanding (unvested) - September 30, 2021 1,598,468 $ 12.07

Regulatory Matters (Tables)

Regulatory Matters (Tables)	9 Months Ended
	Sep. 30, 2021
Banking Regulation [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	The Company’s and the Bank’s levels and ratios are presented in the tables below for the dates indicated and include the effects of the Company’s election to utilize the five-year transition described above: Actual Required For Capital Adequacy Purposes Minimum Capital Adequacy Required To Be Well Capitalized As of September 30, 2021 Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) Common equity Tier 1 capital Company $ 1,623,011 11.01 % $ 663,201 4.50 % $ 1,031,647 7.00 % N/A N/A Bank $ 1,911,158 12.97 % $ 662,865 4.50 % $ 1,031,124 7.00 % $ 957,472 6.50 % Total capital Company $ 1,830,601 12.42 % $ 1,179,025 8.00 % $ 1,547,470 10.50 % N/A N/A Bank $ 2,017,592 13.70 % $ 1,178,427 8.00 % $ 1,546,686 10.50 % $ 1,473,034 10.00 % Tier 1 capital Company $ 1,724,167 11.70 % $ 884,269 6.00 % $ 1,252,714 8.50 % N/A N/A Bank $ 1,911,158 12.97 % $ 883,820 6.00 % $ 1,252,079 8.50 % $ 1,178,427 8.00 % Tier 1 capital Company $ 1,724,167 9.98 % $ 690,864 4.00 % N/A N/A N/A N/A Bank $ 1,911,158 11.07 % $ 690,723 4.00 % N/A N/A $ 863,404 5.00 % Actual Required For Capital Adequacy Purposes Minimum Capital Adequacy Required To Be Well Capitalized As of December 31, 2020 Amount Ratio Amount Ratio Amount Ratio Amount Ratio (Dollars in thousands) Common equity Tier 1 capital Company $ 1,568,508 10.94 % $ 645,366 4.50 % $ 1,003,902 7.00 % N/A N/A Bank $ 1,850,091 12.90 % $ 645,277 4.50 % $ 1,003,764 7.00 % $ 932,066 6.50 % Total capital Company $ 1,846,229 12.87 % $ 1,147,317 8.00 % $ 1,505,853 10.50 % N/A N/A Bank $ 2,027,534 14.14 % $ 1,147,159 8.00 % $ 1,505,646 10.50 % $ 1,433,948 10.00 % Tier 1 capital Company $ 1,668,786 11.64 % $ 860,487 6.00 % $ 1,219,024 8.50 % N/A N/A Bank $ 1,850,091 12.90 % $ 860,369 6.00 % $ 1,218,856 8.50 % $ 1,147,159 8.00 % Tier 1 capital Company $ 1,668,786 10.22 % $ 653,163 4.00 % N/A N/A N/A N/A Bank $ 1,850,091 11.33 % $ 653,241 4.00 % N/A N/A $ 816,551 5.00 %

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	Service charges on deposit accounts and wire transfers are summarized below: Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 (Dollars in thousands) Noninterest bearing deposit account income: Monthly service charges $ 259 $ 303 $ 808 $ 1,001 Customer analysis charges 847 1,693 2,332 5,074 NSF charges 606 608 1,921 2,824 Other service charges 81 110 252 484 Total noninterest bearing deposit account income 1,793 2,714 5,313 9,383 Interest bearing deposit account income: Monthly service charges 21 22 68 69 Total service fees on deposit accounts $ 1,814 $ 2,736 $ 5,381 $ 9,452 Wire transfer fee income: Wire transfer fees $ 766 $ 812 $ 2,256 $ 2,383 Foreign exchange fees 70 80 347 327 Total wire transfer fees $ 836 $ 892 $ 2,603 $ 2,710

Basis of Presentation (Details)

Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest on other borrowings and convertible notes	$ 2,290	$ 3,389		$ 6,892	$ 10,764
Accounting Standards Update 2020-06 | Convertible Notes | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest on other borrowings and convertible notes	1,000			$ 3,100
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Convertible debt, cumulative effect on retained earnings before tax	$ 10,715
Retained earnings | Accounting Standards Update 2020-06 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Convertible debt, cumulative effect on retained earnings before tax			$ 10,700

Earnings Per Share (Details)

Earnings Per Share (Details)	Jun. 07, 2018	Mar. 31, 2020USD ($)shares	Sep. 30, 2021USD ($)$ / sharesshares	Sep. 30, 2020USD ($)$ / sharesshares	Sep. 30, 2021USD ($)$ / sharesshares	Sep. 30, 2020USD ($)$ / sharesshares	Jul. 22, 2021USD ($)	Jun. 06, 2018USD ($)
Antidilutive Securities Excluded from Computation of Earnings Per Share
Share repurchase program, authorized amount | $				$ 50,000,000		$ 50,000,000	$ 50,000,000
Common stock repurchased and recorded as treasury stock (in shares) | shares		2,716,034	3,487,426
Repurchase of treasury stock | $		$ 36,200,000	$ 47,198,000		$ 47,198,000	36,180,000
Net Income (Numerator)
Basic EPS - common stock | $			55,499,000	30,490,000	152,949,000	83,196,000
Diluted EPS - common stock | $			$ 55,499,000	$ 30,490,000	$ 152,949,000	$ 83,196,000
Weighted-Average Shares (Denominator)
Basic EPS - common stock (in shares) | shares			122,244,948	123,251,336	123,050,174	123,581,055
Effect of dilutive securities:
Stock options, restricted stock, and ESPP shares (in shares) | shares			663,588	285,429	798,338	314,029
Diluted EPS - common stock (shares) | shares			122,908,536	123,536,765	123,848,512	123,895,084
Earnings Per Share
Basic EPS - common stock (in dollars per share) | $ / shares			$ 0.45	$ 0.25	$ 1.24	$ 0.67
Diluted EPS - common stock (in dollars per share) | $ / shares			$ 0.45	$ 0.25	$ 1.23	$ 0.67
Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Aggregate principal amount issued | $			$ 217,500,000		$ 217,500,000			$ 217,500,000
Initial conversion rate	0.0450760				0.0450760
Stock options and restricted share awards
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive shares of common stock | shares			934,036	1,206,040	743,553	876,565

Equity Investments - Narrative

Equity Investments - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Net Investment Income [Line Items]
Equity investments with readily determinable fair value	$ 58,512,000		$ 58,512,000		$ 59,699,000
Equity investments without readily determinable fair values	31,400,000		31,400,000		32,100,000
Equity investments without readily determinable fair values, impairment	0	$ 0	0	$ 0
Equity investments without readily determinable fair values, observable price changes	0	$ 0	0	$ 0
Mutual funds
Net Investment Income [Line Items]
Equity investments with readily determinable fair value	27,100,000		27,100,000		27,600,000
Correspondent bank stock
Net Investment Income [Line Items]
Equity investments without readily determinable fair values	370,000		370,000		370,000
CDFI investments
Net Investment Income [Line Items]
Equity investments without readily determinable fair values	1,000,000		1,000,000		1,000,000
CRA investments
Net Investment Income [Line Items]
Equity investments without readily determinable fair values	$ 30,100,000		$ 30,100,000		$ 30,700,000

Equity Investments - Change in

Equity Investments - Change in Fair Value of Equity Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Net change in fair value recorded during the period on equity investments with readily determinable fair value	$ (127)	$ 0	$ (534)	$ 542
Net change in fair value recorded on equity investments sold during the period	0	0	0	0
Net change in fair value on equity investments with readily determinable fair values	$ (127)	$ 0	$ (534)	$ 542

Securities Available for Sale -

Securities Available for Sale - Summary of Securities Available for Sale (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021USD ($)security	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)security	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)security
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,666,362,000		$ 2,666,362,000		$ 2,239,433,000
Gross Unrealized Gains	24,714,000		24,714,000		48,041,000
Gross Unrealized Losses	(21,587,000)		(21,587,000)		(1,863,000)
Allowance For Investment Credit Losses	0		0		0
Fair Value	2,669,489,000		2,669,489,000		2,285,611,000
Net gains on sales of securities available for sale	0	$ 7,500,000	0	$ 7,500,000
Proceeds from sale of securities available for sale	0		0	168,069,000
Unrealized gains on securities available for sale net of taxes	$ 3,543,000		$ 3,543,000		$ 32,753,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	135		135		33
Accrued interest receivable for investment securities available for sale	$ 5,200,000		$ 5,200,000		$ 4,700,000
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Unrealized gains on securities available for sale net of taxes	2,800,000		2,800,000		33,200,000
Collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,070,995,000		1,070,995,000		990,679,000
Gross Unrealized Gains	6,471,000		6,471,000		11,482,000
Gross Unrealized Losses	(6,278,000)		(6,278,000)		(844,000)
Allowance For Investment Credit Losses	0		0		0
Fair Value	1,071,188,000		1,071,188,000		1,001,317,000
Proceeds from sale of securities available for sale				20,200,000
No single maturity date, fair value	1,071,188,000		1,071,188,000
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Allowance For Investment Credit Losses	0		0
Mortgage-backed securities: Residential
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	771,502,000		771,502,000		672,667,000
Gross Unrealized Gains	2,859,000		2,859,000		8,460,000
Gross Unrealized Losses	(10,966,000)		(10,966,000)		(114,000)
Allowance For Investment Credit Losses	0		0		0
Fair Value	$ 763,395,000		$ 763,395,000		$ 681,013,000
Proceeds from sale of securities available for sale				113,300,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	60		60		8
No single maturity date, fair value	$ 763,395,000		$ 763,395,000
Mortgage-backed securities: Commercial
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	581,316,000		581,316,000		$ 482,874,000
Gross Unrealized Gains	13,412,000		13,412,000		25,026,000
Gross Unrealized Losses	(3,067,000)		(3,067,000)		(21,000)
Allowance For Investment Credit Losses	0		0		0
Fair Value	$ 591,661,000		$ 591,661,000		$ 507,879,000
Proceeds from sale of securities available for sale				$ 34,600,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	21		21		1
No single maturity date, fair value	$ 591,661,000		$ 591,661,000
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,410,000		23,410,000		$ 7,000,000
Gross Unrealized Gains	71,000		71,000		15,000
Gross Unrealized Losses	(903,000)		(903,000)		(881,000)
Allowance For Investment Credit Losses	0		0		0
Fair Value	$ 22,578,000		$ 22,578,000		$ 6,134,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	5		5		1
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 100,573,000		$ 100,573,000		$ 86,213,000
Gross Unrealized Gains	1,803,000		1,803,000		3,058,000
Gross Unrealized Losses	(312,000)		(312,000)		(3,000)
Allowance For Investment Credit Losses	0		0		0
Fair Value	$ 102,064,000		$ 102,064,000		$ 89,268,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	12		12		1
Non-US Government and Agency Securities | Credit concentration risk | Stockholders' equity
Debt Securities, Available-for-sale [Line Items]
Maximum exposure to any single issuer			10.00%		10.00%
Asset-backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 118,566,000		$ 118,566,000
Gross Unrealized Gains	98,000		98,000
Gross Unrealized Losses	(61,000)		(61,000)
Allowance For Investment Credit Losses	0		0
Fair Value	$ 118,603,000		$ 118,603,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	5		5
No single maturity date, fair value	$ 118,603,000		$ 118,603,000
U.S. Government Agency and U.S. Government Sponsored Enterprises
Debt Securities, Available-for-sale [Line Items]
Percentage of portfolio	91.00%		91.00%

Securities Available for Sale_2

Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) $ in Thousands	Sep. 30, 2021USD ($)security	Dec. 31, 2020USD ($)security
Amortized Cost
Due within one year	$ 0
Due after one year through five years	2,000
Due after five years through ten years	40,085
Due after ten years	81,898
Amortized Cost	2,666,362	$ 2,239,433
Estimated Fair Value
Due within one year	0
Due after one year through five years	2,029
Due after five years through ten years	40,266
Due after ten years	82,347
Estimated Fair Value	2,669,489	2,285,611
Carrying value of securities pledged to secure public deposits, pledged for various borrowings and for other purposes required or permitted by law	$ 393,700	$ 376,100
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	135	33
Collateralized mortgage obligations
Amortized Cost
Amortized Cost	$ 1,070,995	$ 990,679
Estimated Fair Value
No single maturity date, fair value	1,071,188
Estimated Fair Value	1,071,188	1,001,317
Mortgage-backed securities: Residential
Amortized Cost
Amortized Cost	771,502	672,667
Estimated Fair Value
No single maturity date, fair value	763,395
Estimated Fair Value	$ 763,395	$ 681,013
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	60	8
Mortgage-backed securities: Commercial
Amortized Cost
Amortized Cost	$ 581,316	$ 482,874
Estimated Fair Value
No single maturity date, fair value	591,661
Estimated Fair Value	$ 591,661	$ 507,879
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	21	1
Asset-backed Securities
Amortized Cost
Amortized Cost	$ 118,566
Estimated Fair Value
No single maturity date, fair value	118,603
Estimated Fair Value	$ 118,603
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	5
Municipal Bonds [Member]
Amortized Cost
Amortized Cost	$ 100,573	$ 86,213
Estimated Fair Value
Estimated Fair Value	$ 102,064	$ 89,268
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	12	1

Securities Available for Sale_3

Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)security	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)security	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)security
Number  of Securities
Less than 12 months | security	134		134		32
12 months or longer | security	1		1		1
Total | security	135		135		33
Fair  Value
Less than 12 months	$ 1,641,329,000		$ 1,641,329,000		$ 370,123,000
12 months or longer	4,393,000		4,393,000		4,119,000
Total	1,645,722,000		1,645,722,000		374,242,000
Gross Unrealized Losses
Less than 12 months	(20,979,000)		(20,979,000)		(982,000)
12 months or longer	(608,000)		(608,000)		(881,000)
Total	(21,587,000)		(21,587,000)		(1,863,000)
Allowance for credit losses for available for sale securities	0		0		$ 0
Net gains on sales of securities available for sale	$ 0	$ 7,500,000	$ 0	$ 7,500,000
Collateralized mortgage obligations
Number  of Securities
Less than 12 months | security	32		32		22
12 months or longer | security	0		0		0
Total | security	32		32		22
Fair  Value
Less than 12 months	$ 690,334,000		$ 690,334,000		$ 312,757,000
12 months or longer	0		0		0
Total	690,334,000		690,334,000		312,757,000
Gross Unrealized Losses
Less than 12 months	(6,278,000)		(6,278,000)		(844,000)
12 months or longer	0		0		0
Total	(6,278,000)		(6,278,000)		$ (844,000)
Allowance for credit losses for available for sale securities	0		0
Mortgage-backed securities
Gross Unrealized Losses
Allowance for credit losses for available for sale securities	$ 0		$ 0
Mortgage-backed securities: Residential
Number  of Securities
Less than 12 months | security	60		60		8
12 months or longer | security	0		0		0
Total | security	60		60		8
Fair  Value
Less than 12 months	$ 667,345,000		$ 667,345,000		$ 46,094,000
12 months or longer	0		0		0
Total	667,345,000		667,345,000		46,094,000
Gross Unrealized Losses
Less than 12 months	(10,966,000)		(10,966,000)		(114,000)
12 months or longer	0		0		0
Total	(10,966,000)		(10,966,000)		(114,000)
Allowance for credit losses for available for sale securities	$ 0		$ 0		$ 0
Mortgage-backed securities: Commercial
Number  of Securities
Less than 12 months | security	21		21		1
12 months or longer | security	0		0		0
Total | security	21		21		1
Fair  Value
Less than 12 months	$ 207,216,000		$ 207,216,000		$ 10,275,000
12 months or longer	0		0		0
Total	207,216,000		207,216,000		10,275,000
Gross Unrealized Losses
Less than 12 months	(3,067,000)		(3,067,000)		(21,000)
12 months or longer	0		0		0
Total	(3,067,000)		(3,067,000)		(21,000)
Allowance for credit losses for available for sale securities	$ 0		$ 0		$ 0
Corporate securities
Number  of Securities
Less than 12 months | security	4		4		0
12 months or longer | security	1		1		1
Total | security	5		5		1
Fair  Value
Less than 12 months	$ 14,115,000		$ 14,115,000		$ 0
12 months or longer	4,393,000		4,393,000		4,119,000
Total	18,508,000		18,508,000		4,119,000
Gross Unrealized Losses
Less than 12 months	(295,000)		(295,000)		0
12 months or longer	(608,000)		(608,000)		(881,000)
Total	(903,000)		(903,000)		(881,000)
Allowance for credit losses for available for sale securities	$ 0		$ 0		$ 0
Municipal securities
Number  of Securities
Less than 12 months | security	12		12		1
12 months or longer | security	0		0		0
Total | security	12		12		1
Fair  Value
Less than 12 months	$ 17,832,000		$ 17,832,000		$ 997,000
12 months or longer	0		0		0
Total	17,832,000		17,832,000		997,000
Gross Unrealized Losses
Less than 12 months	(312,000)		(312,000)		(3,000)
12 months or longer	0		0		0
Total	(312,000)		(312,000)		(3,000)
Allowance for credit losses for available for sale securities	$ 0		$ 0		$ 0
U.S. Government Agency and U.S. Government Sponsored Enterprises
Gross Unrealized Losses
Percentage of portfolio	91.00%		91.00%
Asset-backed Securities
Number  of Securities
Less than 12 months | security	5		5
12 months or longer | security	0		0
Total | security	5		5
Fair  Value
Less than 12 months	$ 44,487,000		$ 44,487,000
12 months or longer	0		0
Total	44,487,000		44,487,000
Gross Unrealized Losses
Less than 12 months	(61,000)		(61,000)
12 months or longer	0		0
Total	(61,000)		(61,000)
Allowance for credit losses for available for sale securities	$ 0		$ 0

Loans Receivable and Allowanc_3

Loans Receivable and Allowance for Credit Losses - Schedule of Loans Receivable By Major Category (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)segment	Jun. 30, 2021USD ($)	Dec. 31, 2020USD ($)	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2019USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 13,418,691		$ 13,563,213
Allowance for credit losses	(136,774)	$ (189,452)	(206,741)	$ (179,849)	$ (161,771)	$ (94,144)
Loans receivable, net of allowance for credit losses	13,281,917		13,356,472
Net deferred fees/costs	$ 8,500		3,600
Number of portfolio segments | segment	4
Increase (Decrease) in Finance Receivables	$ (144,500)
SBA, Paycheck Protection Program Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred fees/costs	11,200		6,400
Increase (Decrease) in Finance Receivables	324,500
Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	8,908,657		8,772,134
Allowance for credit losses	(105,569)	(155,253)	(162,196)	(129,624)	(119,030)	(53,593)
Real estate loans | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	60,051		54,795
Allowance for credit losses	(371)		(391)
Real estate loans | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	8,602,519		8,425,959
Allowance for credit losses	(103,561)		(159,527)
Real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	246,087		291,380
Allowance for credit losses	(1,637)		(2,278)
Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	3,857,879		4,157,787
Allowance for credit losses	(27,372)	(29,500)	(39,155)	(44,209)	(35,493)	(33,032)
Increase (Decrease) in Finance Receivables	(344,400)
Commercial business | SBA, Paycheck Protection Program Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	336,600		452,700
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	599,781		582,232
Allowance for credit losses	(2,689)	(3,612)	(4,227)	(4,699)	(5,868)	(5,925)
Financing Receivable, Purchase	215,000
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	52,374		51,060
Allowance for credit losses	$ (1,144)	$ (1,087)	$ (1,163)	$ (1,317)	$ (1,380)	$ (1,594)

Loans Receivable and Allowanc_4

Loans Receivable and Allowance for Credit Losses - Allowance for Credit Losses on Financing Receivables (Details) - USD ($)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Allowance for Loan Losses and the Loans Receivables by Impairment Methodology
Accrued interest receivable on loans	$ 41,800,000			$ 41,800,000		$ 54,600,000
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	189,452,000	$ 206,741,000	$ 161,771,000	206,741,000	$ 94,144,000	94,144,000
Provision (credit) for credit/loan losses	(10,000,000)		22,000,000	(13,700,000)	67,500,000
Loans charged off	(44,583,000)		(6,350,000)	(60,896,000)	(13,211,000)
Recoveries of charge offs	1,905,000		2,428,000	4,629,000	5,216,000
Balance, end of period	136,774,000		179,849,000	136,774,000	179,849,000	206,741,000
Allowance for credit losses:
Individually evaluated	6,437,000			6,437,000		7,325,000
Collectively evaluated	130,337,000			130,337,000		199,416,000
Total	136,774,000			136,774,000		206,741,000
Loans outstanding:
Individually evaluated	94,296,000			94,296,000		123,203,000
Collectively evaluated	13,324,395,000			13,324,395,000		13,440,010,000
Total	13,418,691,000			13,418,691,000		13,563,213,000
Reserve for unfunded loan commitments recorded in other liabilities	1,400,000			1,400,000		$ 1,300,000
Additions to reserves for unfunded loan commitments recorded in credit related expenses	0		0	105,000	$ 660,000
CECL impact					Accounting Standards Update 2016-13 [Member]	Accounting Standards Update 2020-06
Provision for accrued interest receivables on loans				770,000	$ 0
ACL for the TDRs that had payment defaults	51,000		4,000	84,000	67,000
Total charge-offs of TDR loans modified	0		0	0	0
COVID-19 Payment Deferral Modifications
Loans outstanding:
Provision for accrued interest receivables on loans		1,000,000		320,000
Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan Losses by Portfolio Segment
Balance, end of period			26,200,000		26,200,000
Real estate
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	155,253,000	162,196,000	119,030,000	162,196,000	53,593,000	$ 53,593,000
Provision (credit) for credit/loan losses	(9,142,000)		15,748,000	(2,570,000)	55,773,000
Loans charged off	(41,655,000)		(5,313,000)	(56,645,000)	(7,884,000)
Recoveries of charge offs	1,113,000		159,000	2,588,000	351,000
Balance, end of period	105,569,000		129,624,000	105,569,000	129,624,000	162,196,000
Allowance for credit losses:
Individually evaluated	3,025,000			3,025,000		3,683,000
Collectively evaluated	102,544,000			102,544,000		158,513,000
Total	105,569,000			105,569,000		162,196,000
Loans outstanding:
Individually evaluated	72,776,000			72,776,000		93,476,000
Collectively evaluated	8,835,881,000			8,835,881,000		8,678,658,000
Total	8,908,657,000			8,908,657,000		8,772,134,000
Real estate | Hotel & motel
Allowance for Loan Losses by Portfolio Segment
Loans charged off	(2,900,000)			(14,700,000)
Real estate | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan Losses by Portfolio Segment
Balance, end of period			27,791,000		27,791,000
Commercial business
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	29,500,000	39,155,000	35,493,000	39,155,000	33,032,000	33,032,000
Provision (credit) for credit/loan losses	(1,011,000)		7,265,000	(10,565,000)	11,663,000
Loans charged off	(1,895,000)		(800,000)	(3,077,000)	(4,294,000)
Recoveries of charge offs	778,000		2,251,000	1,859,000	4,830,000
Balance, end of period	27,372,000		44,209,000	27,372,000	44,209,000	39,155,000
Allowance for credit losses:
Individually evaluated	3,376,000			3,376,000		3,575,000
Collectively evaluated	23,996,000			23,996,000		35,580,000
Total	27,372,000			27,372,000		39,155,000
Loans outstanding:
Individually evaluated	19,660,000			19,660,000		25,706,000
Collectively evaluated	3,838,219,000			3,838,219,000		4,132,081,000
Total	3,857,879,000			3,857,879,000		4,157,787,000
Commercial business | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan Losses by Portfolio Segment
Balance, end of period			(1,022,000)		(1,022,000)
Residential mortgage
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	3,612,000	4,227,000	5,868,000	4,227,000	5,925,000	5,925,000
Provision (credit) for credit/loan losses	0		(1,169,000)	(615,000)	(683,000)
Loans charged off	(923,000)		0	(923,000)	0
Recoveries of charge offs	0		0	0	0
Balance, end of period	2,689,000		4,699,000	2,689,000	4,699,000	4,227,000
Allowance for credit losses:
Individually evaluated	9,000			9,000		25,000
Collectively evaluated	2,680,000			2,680,000		4,202,000
Total	2,689,000			2,689,000		4,227,000
Loans outstanding:
Individually evaluated	1,599,000			1,599,000		3,416,000
Collectively evaluated	598,182,000			598,182,000		578,816,000
Total	599,781,000			599,781,000		582,232,000
Residential mortgage | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan Losses by Portfolio Segment
Balance, end of period			(543,000)		(543,000)
Consumer and other
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	1,087,000	$ 1,163,000	1,380,000	1,163,000	1,594,000	1,594,000
Provision (credit) for credit/loan losses	153,000		156,000	50,000	747,000
Loans charged off	(110,000)		(237,000)	(251,000)	(1,033,000)
Recoveries of charge offs	14,000		18,000	182,000	35,000
Balance, end of period	1,144,000		1,317,000	1,144,000	1,317,000	1,163,000
Allowance for credit losses:
Individually evaluated	27,000			27,000		42,000
Collectively evaluated	1,117,000			1,117,000		1,121,000
Total	1,144,000			1,144,000		1,163,000
Loans outstanding:
Individually evaluated	261,000			261,000		605,000
Collectively evaluated	52,113,000			52,113,000		50,455,000
Total	$ 52,374,000			$ 52,374,000		$ 51,060,000
Consumer and other | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan Losses by Portfolio Segment
Balance, end of period			$ (26,000)		$ (26,000)

Loans Receivable and Allowanc_5

Loans Receivable and Allowance for Credit Losses - Nonaccrual Loans and Loans Past Due 90 or More Days and Still on Accrual Status (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Threshold period for loans to be placed on nonaccrual status	90 days
Guaranteed portion of SBA loans excluded from Nonaccrual loans	$ 20,600	$ 26,500
Nonaccrual with No ACL	17,210	40,039
Nonaccrual with an ACL	37,170	45,199
Financing Receivable, Nonaccrual	54,380	85,238
Accruing Loans Past Due 90 or More Days	4,567	614
Commercial business
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No ACL	4,951	5,319
Nonaccrual with an ACL	6,040	8,592
Financing Receivable, Nonaccrual	10,991	13,911
Accruing Loans Past Due 90 or More Days	500	0
Residential Portfolio Segment
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No ACL	0	1,440
Nonaccrual with an ACL	1,599	1,976
Financing Receivable, Nonaccrual	1,599	3,416
Accruing Loans Past Due 90 or More Days	392	0
Consumer
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No ACL	0	0
Nonaccrual with an ACL	117	461
Financing Receivable, Nonaccrual	117	461
Accruing Loans Past Due 90 or More Days	82	136
Residential Mortgage [Member] | Real estate loans
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No ACL	0	0
Nonaccrual with an ACL	0	0
Financing Receivable, Nonaccrual	0	0
Accruing Loans Past Due 90 or More Days	0	0
Commercial | Real estate loans | Retail
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No ACL	4,542	3,262
Nonaccrual with an ACL	2,831	8,530
Financing Receivable, Nonaccrual	7,373	11,792
Accruing Loans Past Due 90 or More Days	0	478
Commercial | Real estate loans | Hotel & motel
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No ACL	4,241	15,311
Nonaccrual with an ACL	9,576	2,195
Financing Receivable, Nonaccrual	13,817	17,506
Accruing Loans Past Due 90 or More Days	0	0
Commercial | Real estate loans | Real Estate Commercial Gas Station & Car Wash [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No ACL	575	151
Nonaccrual with an ACL	1,433	1,493
Financing Receivable, Nonaccrual	2,008	1,644
Accruing Loans Past Due 90 or More Days	0	0
Commercial | Real estate loans | Mixed use
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No ACL	0	1,883
Nonaccrual with an ACL	6,954	788
Financing Receivable, Nonaccrual	6,954	2,671
Accruing Loans Past Due 90 or More Days	1,704	0
Commercial | Real estate loans | Industrial & warehouse
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No ACL	2,013	5,443
Nonaccrual with an ACL	2,314	1,022
Financing Receivable, Nonaccrual	4,327	6,465
Accruing Loans Past Due 90 or More Days	0	0
Commercial | Real estate loans | Other
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No ACL	888	7,230
Nonaccrual with an ACL	6,306	1,419
Financing Receivable, Nonaccrual	7,194	8,649
Accruing Loans Past Due 90 or More Days	1,889	0
Construction | Real estate loans
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No ACL	0	0
Nonaccrual with an ACL	0	18,723
Financing Receivable, Nonaccrual	0	18,723
Accruing Loans Past Due 90 or More Days	$ 0	$ 0

Loans Receivable and Allowanc_6

Loans Receivable and Allowance for Credit Losses - Collateral-Dependent Loans (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 136,774,000	$ 179,849,000	$ 136,774,000	$ 179,849,000	$ 189,452,000	$ 206,741,000	$ 161,771,000	$ 94,144,000
Interest income reversals due to loans being placed on nonaccrual status	1,100,000	76,000	2,800,000	611,000
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	52,516,000		52,516,000			79,652,000
Real Estate Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	46,053,000		46,053,000			73,340,000
Other Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,463,000		6,463,000			6,312,000
Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	105,569,000	129,624,000	105,569,000	129,624,000	155,253,000	162,196,000	119,030,000	53,593,000
Real estate | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	371,000		371,000			391,000
Real estate | Residential | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0		0			0
Real estate | Residential | Real Estate Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0		0			0
Real estate | Residential | Other Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0		0			0
Real estate | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	103,561,000		103,561,000			159,527,000
Real estate | Commercial | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	44,061,000		44,061,000			55,945,000
Real estate | Commercial | Real Estate Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	44,061,000		44,061,000			55,945,000
Real estate | Commercial | Other Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0		0			0
Real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,637,000		1,637,000			2,278,000
Real estate | Construction | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0		0			8,122,000
Real estate | Construction | Real Estate Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0		0			8,122,000
Real estate | Construction | Other Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0		0			0
Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	27,372,000	44,209,000	27,372,000	44,209,000	29,500,000	39,155,000	35,493,000	33,032,000
Commercial business | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	8,455,000		8,455,000			14,130,000
Commercial business | Real Estate Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,992,000		1,992,000			7,818,000
Commercial business | Other Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,463,000		6,463,000			6,312,000
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,689,000	4,699,000	2,689,000	4,699,000	3,612,000	4,227,000	5,868,000	5,925,000
Residential mortgage | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0		0			1,440,000
Residential mortgage | Real Estate Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0		0			1,440,000
Residential mortgage | Other Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0		0			0
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,144,000	$ 1,317,000	1,144,000	$ 1,317,000	$ 1,087,000	1,163,000	$ 1,380,000	$ 1,594,000
Consumer and other | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0		0			15,000
Consumer and other | Real Estate Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0		0			15,000
Consumer and other | Other Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 0		$ 0			$ 0

Loans Receivable and Allowanc_7

Loans Receivable and Allowance for Credit Losses - Past Due Financing Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total loans	$ 13,418,691	$ 13,563,213
Total Past Due
Financing Receivable, Past Due [Line Items]
Total loans	62,134	76,799
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	15,469	19,100
60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans	13,776	16,459
90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	32,889	41,240
Real estate
Financing Receivable, Past Due [Line Items]
Total loans	8,908,657	8,772,134
Real estate | Residential
Financing Receivable, Past Due [Line Items]
Total loans	60,051	54,795
Real estate | Residential | Total Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Real estate | Residential | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Real estate | Residential | 60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Real estate | Residential | 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Real estate | Commercial
Financing Receivable, Past Due [Line Items]
Total loans	8,602,519	8,425,959
Real estate | Commercial | Retail | Total Past Due
Financing Receivable, Past Due [Line Items]
Total loans	10,054	19,269
Real estate | Commercial | Retail | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	2,364	852
Real estate | Commercial | Retail | 60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans	3,354	8,141
Real estate | Commercial | Retail | 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	4,336	10,276
Real estate | Commercial | Hotel & motel | Total Past Due
Financing Receivable, Past Due [Line Items]
Total loans	11,562	16,207
Real estate | Commercial | Hotel & motel | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	425	62
Real estate | Commercial | Hotel & motel | 60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans	1,522	1,401
Real estate | Commercial | Hotel & motel | 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	9,615	14,744
Real estate | Commercial | Gas station & car wash | Total Past Due
Financing Receivable, Past Due [Line Items]
Total loans	607	3,850
Real estate | Commercial | Gas station & car wash | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	619
Real estate | Commercial | Gas station & car wash | 60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	2,668
Real estate | Commercial | Gas station & car wash | 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	607	563
Real estate | Commercial | Mixed use | Total Past Due
Financing Receivable, Past Due [Line Items]
Total loans	8,569	1,385
Real estate | Commercial | Mixed use | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	1,037	116
Real estate | Commercial | Mixed use | 60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans	5,307	0
Real estate | Commercial | Mixed use | 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	2,225	1,269
Real estate | Commercial | Industrial & warehouse | Total Past Due
Financing Receivable, Past Due [Line Items]
Total loans	4,708	3,967
Real estate | Commercial | Industrial & warehouse | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	145	137
Real estate | Commercial | Industrial & warehouse | 60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans	2,110	0
Real estate | Commercial | Industrial & warehouse | 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	2,453	3,830
Real estate | Commercial | Other | Total Past Due
Financing Receivable, Past Due [Line Items]
Total loans	7,107	6,283
Real estate | Commercial | Other | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	2,034	2,738
Real estate | Commercial | Other | 60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans	1,235	545
Real estate | Commercial | Other | 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	3,838	3,000
Real estate | Construction
Financing Receivable, Past Due [Line Items]
Total loans	246,087	291,380
Real estate | Construction | Total Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	8,122
Real estate | Construction | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	8,122
Real estate | Construction | 60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Real estate | Construction | 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Commercial business
Financing Receivable, Past Due [Line Items]
Total loans	3,857,879	4,157,787
Commercial business | Total Past Due
Financing Receivable, Past Due [Line Items]
Total loans	17,885	9,199
Commercial business | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	9,241	816
Commercial business | 60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans	233	3,683
Commercial business | 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	8,411	4,700
Residential mortgage
Financing Receivable, Past Due [Line Items]
Total loans	599,781	582,232
Residential mortgage | Total Past Due
Financing Receivable, Past Due [Line Items]
Total loans	1,517	7,104
Residential mortgage | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	195	4,841
Residential mortgage | 60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans	0	0
Residential mortgage | 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	1,322	2,263
Consumer and other
Financing Receivable, Past Due [Line Items]
Total loans	52,374	51,060
Consumer and other | Total Past Due
Financing Receivable, Past Due [Line Items]
Total loans	125	1,413
Consumer and other | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	28	797
Consumer and other | 60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Total loans	15	21
Consumer and other | 90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total loans	$ 82	$ 595

Loans Receivable and Allowanc_8

Loans Receivable and Allowance for Credit Losses - Financing Receivable Credit Quality Indicators (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	$ 3,237,207,000	$ 2,916,458,000
Term loan originated in year two	2,088,841,000	2,338,244,000
Term loan originated in year three	1,902,371,000	2,179,365,000
Term loan originated in year four	1,743,811,000	1,673,297,000
Term loan originated in year five	1,271,954,000	995,558,000
Term loan originated prior to year five	1,710,303,000	1,591,756,000
Revolving Loans	1,464,204,000	1,868,535,000
Total loans	13,418,691,000	13,563,213,000
Revolving loans converted to term loans	0	0
Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	8,908,657,000	8,772,134,000
Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	1,196,789,000	1,302,794,000
Term loan originated in year two	546,667,000	613,469,000
Term loan originated in year three	467,847,000	260,839,000
Term loan originated in year four	142,159,000	136,731,000
Term loan originated in year five	83,911,000	89,755,000
Term loan originated prior to year five	98,827,000	52,276,000
Revolving Loans	1,321,679,000	1,701,923,000
Total loans	3,857,879,000	4,157,787,000
Residential Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	253,561,000	5,733,000
Term loan originated in year two	3,824,000	91,080,000
Term loan originated in year three	45,379,000	217,879,000
Term loan originated in year four	140,877,000	169,388,000
Term loan originated in year five	96,198,000	56,961,000
Term loan originated prior to year five	59,942,000	41,191,000
Revolving Loans	0	0
Total loans	599,781,000	582,232,000
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	12,153,000	8,309,000
Term loan originated in year two	5,671,000	2,463,000
Term loan originated in year three	1,868,000	1,818,000
Term loan originated in year four	1,670,000	2,424,000
Term loan originated in year five	1,901,000	4,811,000
Term loan originated prior to year five	7,753,000	3,343,000
Revolving Loans	21,358,000	27,892,000
Total loans	52,374,000	51,060,000
Pass / not rated
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	3,221,572,000	2,907,906,000
Term loan originated in year two	2,078,150,000	2,292,068,000
Term loan originated in year three	1,821,060,000	2,088,791,000
Term loan originated in year four	1,645,464,000	1,595,141,000
Term loan originated in year five	1,168,125,000	917,069,000
Term loan originated prior to year five	1,488,107,000	1,362,723,000
Revolving Loans	1,445,763,000	1,848,017,000
Total loans	12,868,241,000	13,011,715,000
Pass / not rated | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	1,193,990,000	1,294,368,000
Term loan originated in year two	545,116,000	584,453,000
Term loan originated in year three	452,416,000	224,447,000
Term loan originated in year four	138,691,000	117,708,000
Term loan originated in year five	75,851,000	77,209,000
Term loan originated prior to year five	82,834,000	43,674,000
Revolving Loans	1,309,437,000	1,686,428,000
Total loans	3,798,335,000	4,028,287,000
Pass / not rated | Residential Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	253,561,000	5,733,000
Term loan originated in year two	3,824,000	90,958,000
Term loan originated in year three	45,251,000	217,343,000
Term loan originated in year four	140,682,000	168,827,000
Term loan originated in year five	95,657,000	55,246,000
Term loan originated prior to year five	59,206,000	40,554,000
Revolving Loans	0	0
Total loans	598,181,000	578,661,000
Pass / not rated | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	12,153,000	8,309,000
Term loan originated in year two	5,671,000	2,463,000
Term loan originated in year three	1,868,000	1,818,000
Term loan originated in year four	1,670,000	2,321,000
Term loan originated in year five	1,901,000	4,756,000
Term loan originated prior to year five	7,512,000	2,811,000
Revolving Loans	21,358,000	27,890,000
Total loans	52,133,000	50,368,000
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	7,491,000	5,996,000
Term loan originated in year two	8,664,000	30,498,000
Term loan originated in year three	63,567,000	55,421,000
Term loan originated in year four	66,557,000	25,426,000
Term loan originated in year five	54,665,000	20,190,000
Term loan originated prior to year five	96,252,000	40,411,000
Revolving Loans	9,570,000	6,999,000
Total loans	306,766,000	184,941,000
Special mention | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	1,134,000	5,996,000
Term loan originated in year two	401,000	27,693,000
Term loan originated in year three	13,667,000	30,852,000
Term loan originated in year four	1,469,000	14,629,000
Term loan originated in year five	3,242,000	6,388,000
Term loan originated prior to year five	10,343,000	3,139,000
Revolving Loans	3,371,000	5,172,000
Total loans	33,627,000	93,869,000
Special mention | Residential Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0	0
Term loan originated in year two	0	0
Term loan originated in year three	0	0
Term loan originated in year four	0	0
Term loan originated in year five	0	0
Term loan originated prior to year five	0	0
Revolving Loans	0	0
Total loans	0	0
Special mention | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0	0
Term loan originated in year two	0	0
Term loan originated in year three	0	0
Term loan originated in year four	0	103,000
Term loan originated in year five	0	0
Term loan originated prior to year five	0	0
Revolving Loans	0	0
Total loans	0	103,000
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	8,144,000	2,556,000
Term loan originated in year two	2,027,000	15,678,000
Term loan originated in year three	17,744,000	35,152,000
Term loan originated in year four	31,790,000	52,730,000
Term loan originated in year five	49,164,000	58,299,000
Term loan originated prior to year five	125,944,000	188,622,000
Revolving Loans	8,871,000	13,519,000
Total loans	243,684,000	366,556,000
Substandard | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	1,665,000	2,430,000
Term loan originated in year two	1,150,000	1,323,000
Term loan originated in year three	1,764,000	5,539,000
Term loan originated in year four	1,999,000	4,394,000
Term loan originated in year five	4,818,000	6,158,000
Term loan originated prior to year five	5,650,000	5,463,000
Revolving Loans	8,871,000	10,323,000
Total loans	25,917,000	35,630,000
Substandard | Residential Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0	0
Term loan originated in year two	0	122,000
Term loan originated in year three	128,000	536,000
Term loan originated in year four	195,000	561,000
Term loan originated in year five	541,000	1,715,000
Term loan originated prior to year five	736,000	637,000
Revolving Loans	0	0
Total loans	1,600,000	3,571,000
Substandard | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0	0
Term loan originated in year two	0	0
Term loan originated in year three	0	0
Term loan originated in year four	0	0
Term loan originated in year five	0	55,000
Term loan originated prior to year five	241,000	532,000
Revolving Loans	0	2,000
Total loans	241,000	589,000
Doubtful / loss
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0	0
Term loan originated in year two	0	0
Term loan originated in year three	0	1,000
Term loan originated in year four	0	0
Term loan originated in year five	0	0
Term loan originated prior to year five	0	0
Revolving Loans	0	0
Total loans	0	1,000
Doubtful / loss | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0	0
Term loan originated in year two	0	0
Term loan originated in year three	0	1,000
Term loan originated in year four	0	0
Term loan originated in year five	0	0
Term loan originated prior to year five	0	0
Revolving Loans	0	0
Total loans	0	1,000
Doubtful / loss | Residential Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0	0
Term loan originated in year two	0	0
Term loan originated in year three	0	0
Term loan originated in year four	0	0
Term loan originated in year five	0	0
Term loan originated prior to year five	0	0
Revolving Loans	0	0
Total loans	0	0
Doubtful / loss | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0	0
Term loan originated in year two	0	0
Term loan originated in year three	0	0
Term loan originated in year four	0	0
Term loan originated in year five	0	0
Term loan originated prior to year five	0	0
Revolving Loans	0	0
Total loans	0	0
Residential Mortgage [Member] | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	16,184,000	15,158,000
Term loan originated in year two	11,789,000	13,924,000
Term loan originated in year three	11,747,000	7,726,000
Term loan originated in year four	5,648,000	4,316,000
Term loan originated in year five	3,796,000	6,800,000
Term loan originated prior to year five	8,378,000	3,540,000
Revolving Loans	2,509,000	3,331,000
Total loans	60,051,000	54,795,000
Residential Mortgage [Member] | Pass / not rated | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	16,184,000	15,158,000
Term loan originated in year two	11,789,000	13,924,000
Term loan originated in year three	11,747,000	7,587,000
Term loan originated in year four	5,514,000	4,316,000
Term loan originated in year five	3,796,000	6,800,000
Term loan originated prior to year five	8,017,000	3,460,000
Revolving Loans	2,281,000	3,104,000
Total loans	59,328,000	54,349,000
Residential Mortgage [Member] | Special mention | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0	0
Term loan originated in year two	0	0
Term loan originated in year three	0	0
Term loan originated in year four	0	0
Term loan originated in year five	0	0
Term loan originated prior to year five	361,000	0
Revolving Loans	228,000	227,000
Total loans	589,000	227,000
Residential Mortgage [Member] | Substandard | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0	0
Term loan originated in year two	0	0
Term loan originated in year three	0	139,000
Term loan originated in year four	134,000	0
Term loan originated in year five	0	0
Term loan originated prior to year five	0	80,000
Revolving Loans	0	0
Total loans	134,000	219,000
Residential Mortgage [Member] | Doubtful / loss | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0	0
Term loan originated in year two	0	0
Term loan originated in year three	0	0
Term loan originated in year four	0	0
Term loan originated in year five	0	0
Term loan originated prior to year five	0	0
Revolving Loans	0	0
Total loans	0	0
Commercial | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	1,751,472,000	1,548,721,000
Term loan originated in year two	1,461,387,000	1,572,018,000
Term loan originated in year three	1,346,116,000	1,587,309,000
Term loan originated in year four	1,366,719,000	1,288,841,000
Term loan originated in year five	1,055,528,000	825,720,000
Term loan originated prior to year five	1,513,433,000	1,467,961,000
Revolving Loans	107,864,000	135,389,000
Total loans	8,602,519,000	8,425,959,000
Commercial | Pass / not rated | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	1,738,636,000	1,548,595,000
Term loan originated in year two	1,452,247,000	1,554,980,000
Term loan originated in year three	1,280,364,000	1,533,802,000
Term loan originated in year four	1,318,119,000	1,240,973,000
Term loan originated in year five	965,008,000	767,318,000
Term loan originated prior to year five	1,314,555,000	1,262,125,000
Revolving Loans	101,893,000	130,595,000
Total loans	8,170,822,000	8,038,388,000
Commercial | Special mention | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	6,357,000	0
Term loan originated in year two	8,263,000	2,805,000
Term loan originated in year three	49,900,000	24,569,000
Term loan originated in year four	19,138,000	10,694,000
Term loan originated in year five	46,715,000	8,031,000
Term loan originated prior to year five	79,561,000	32,048,000
Revolving Loans	5,971,000	1,600,000
Total loans	215,905,000	79,747,000
Commercial | Substandard | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	6,479,000	126,000
Term loan originated in year two	877,000	14,233,000
Term loan originated in year three	15,852,000	28,938,000
Term loan originated in year four	29,462,000	37,174,000
Term loan originated in year five	43,805,000	50,371,000
Term loan originated prior to year five	119,317,000	173,788,000
Revolving Loans	0	3,194,000
Total loans	215,792,000	307,824,000
Commercial | Doubtful / loss | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0	0
Term loan originated in year two	0	0
Term loan originated in year three	0	0
Term loan originated in year four	0	0
Term loan originated in year five	0	0
Term loan originated prior to year five	0	0
Revolving Loans	0	0
Total loans	0	0
Construction | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	7,048,000	35,743,000
Term loan originated in year two	59,503,000	45,290,000
Term loan originated in year three	29,414,000	103,794,000
Term loan originated in year four	86,738,000	71,597,000
Term loan originated in year five	30,620,000	11,511,000
Term loan originated prior to year five	21,970,000	23,445,000
Revolving Loans	10,794,000	0
Total loans	246,087,000	291,380,000
Construction | Pass / not rated | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	7,048,000	35,743,000
Term loan originated in year two	59,503,000	45,290,000
Term loan originated in year three	29,414,000	103,794,000
Term loan originated in year four	40,788,000	60,996,000
Term loan originated in year five	25,912,000	5,740,000
Term loan originated prior to year five	15,983,000	10,099,000
Revolving Loans	10,794,000	0
Total loans	189,442,000	261,662,000
Construction | Special mention | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0	0
Term loan originated in year two	0	0
Term loan originated in year three	0	0
Term loan originated in year four	45,950,000	0
Term loan originated in year five	4,708,000	5,771,000
Term loan originated prior to year five	5,987,000	5,224,000
Revolving Loans	0	0
Total loans	56,645,000	10,995,000
Construction | Substandard | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0	0
Term loan originated in year two	0	0
Term loan originated in year three	0	0
Term loan originated in year four	0	10,601,000
Term loan originated in year five	0	0
Term loan originated prior to year five	0	8,122,000
Revolving Loans	0	0
Total loans	0	18,723,000
Construction | Doubtful / loss | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0	0
Term loan originated in year two	0	0
Term loan originated in year three	0	0
Term loan originated in year four	0	0
Term loan originated in year five	0	0
Term loan originated prior to year five	0	0
Revolving Loans	0	0
Total loans	$ 0	$ 0

Loans Receivable and Allowanc_9

Loans Receivable and Allowance for Credit Losses - Loans Held For Investment - Reclassification to Held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfer of loans held for investment to held for sale	$ 193,199	$ 0	$ 374,034	$ 1,002
Total loans	13,418,691		13,418,691		$ 13,563,213
Pass / not rated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	12,868,241		12,868,241		13,011,715
Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	306,766		306,766		184,941
Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	243,684		243,684		366,556
Doubtful / loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0		0		1
Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,908,657		8,908,657		8,772,134
Real estate loans | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	60,051		60,051		54,795
Real estate loans | Residential | Pass / not rated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	59,328		59,328		54,349
Real estate loans | Residential | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	589		589		227
Real estate loans | Residential | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	134		134		219
Real estate loans | Residential | Doubtful / loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0		0		0
Real estate loans | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfer of loans held for investment to held for sale	107,191	0	278,366	0
Total loans	8,602,519		8,602,519		8,425,959
Real estate loans | Commercial | Pass / not rated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,170,822		8,170,822		8,038,388
Real estate loans | Commercial | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	215,905		215,905		79,747
Real estate loans | Commercial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	215,792		215,792		307,824
Real estate loans | Commercial | Doubtful / loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0		0		0
Real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	246,087		246,087		291,380
Real estate loans | Construction | Pass / not rated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	189,442		189,442		261,662
Real estate loans | Construction | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	56,645		56,645		10,995
Real estate loans | Construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0		0		18,723
Real estate loans | Construction | Doubtful / loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0		0		0
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfer of loans held for investment to held for sale	7,018	0	7,018	1,002
Total loans	599,781		599,781		582,232
Residential mortgage | Pass / not rated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	598,181		598,181		578,661
Residential mortgage | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0		0		0
Residential mortgage | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,600		1,600		3,571
Residential mortgage | Doubtful / loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0		0		0
Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfer of loans held for investment to held for sale	78,990	$ 0	88,650	$ 0
Total loans	3,857,879		3,857,879		4,157,787
Commercial business | Pass / not rated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,798,335		3,798,335		4,028,287
Commercial business | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	33,627		33,627		93,869
Commercial business | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	25,917		25,917		35,630
Commercial business | Doubtful / loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0		0		1
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	52,374		52,374		51,060
Consumer | Pass / not rated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	52,133		52,133		50,368
Consumer | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0		0		103
Consumer | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	241		241		589
Consumer | Doubtful / loss
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 0		$ 0		$ 0

Loans Receivable and Allowan_10

Loans Receivable and Allowance for Credit Losses - Additional Information (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2021USD ($)loan	Mar. 31, 2021loan	Sep. 30, 2020USD ($)loan	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan	Dec. 31, 2020USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss, writeoff	$ 44,583,000		$ 6,350,000	$ 60,896,000	$ 13,211,000
Reasonable and supportable period at which point loss assumptions revert back to historical loss information				2 years
Reversion period				1 year
Non-modeled loans as percentage of total loan portfolio (less than)	3.00%			3.00%
Positive or negative qualitative adjustment of the Loss Migration Ratio	0.25%			0.25%
Financing receivable, balance threshold to determine individual evaluation for impairment	$ 500,000			$ 500,000
Total TDR loans	$ 54,447,000			$ 54,447,000		$ 51,609,000
Number of loans | loan	0		4	14	15
Allowance for TDRs	$ 2,900,000			$ 2,900,000		4,800,000
ACL for TDRs modified during period			$ 342,000	89,000	$ 661,000
Total charge-offs of TDR loans modified	0		0	0	0
ACL for the TDRs that had payment defaults	51,000		4,000	84,000	67,000
Total charge offs for TDR loans that had payment defaults	0		0	0	0
Accrued interest receivable on loans	41,800,000			41,800,000		54,600,000
Net deferred fees/costs	8,500,000			8,500,000		3,600,000
Total loans	13,418,691,000			13,418,691,000		13,563,213,000
Increase (Decrease) in Finance Receivables				(144,500,000)
Transfer from loans receivable to loans held for sale				374,034,000	1,002,000
Loans held for sale, at the lower of cost or fair value	179,117,000			179,117,000		17,743,000
Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Transfer from loans receivable to loans held for sale				131,200,000
COVID-19 Pandemic
Financing Receivable, Allowance for Credit Loss [Line Items]
Amount of loans modified				122,000,000
SBA, Paycheck Protection Program Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Net deferred fees/costs	11,200,000			11,200,000		6,400,000
Increase (Decrease) in Finance Receivables				324,500,000
Real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Proceeds from sale of loans				148,900,000
Allowance for credit loss, writeoff	41,655,000		$ 5,313,000	56,645,000	$ 7,884,000
Total loans	8,908,657,000			8,908,657,000		8,772,134,000
Real estate | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss, writeoff				10,700,000
Real estate | Hotel & motel
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss, writeoff	2,900,000			$ 14,700,000
Real estate | COVID-19 Pandemic
Financing Receivable, Allowance for Credit Loss [Line Items]
Percent of loans modified (more than)				95.00%
Real estate | TDR Loans on Accrual Status
Financing Receivable, Allowance for Credit Loss [Line Items]
Total TDR loans	30,855,000			$ 30,855,000		25,771,000
Real estate | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	8,602,519,000			$ 8,602,519,000		8,425,959,000
Real estate | Commercial | Special mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Proceeds from sale of loans	68,400,000
Real estate | Commercial | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Proceeds from sale of loans	$ 56,200,000
Real estate | Commercial | Hotel & motel
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of loans | loan	0		0	0	0
Real estate | Commercial | TDR Loans on Accrual Status
Financing Receivable, Allowance for Credit Loss [Line Items]
Total TDR loans	$ 30,900,000			$ 30,900,000		25,800,000
Number of loans | loan		33		30
Commercial business
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss, writeoff	$ 1,895,000		$ 800,000	$ 3,077,000	$ 4,294,000
Number of loans | loan	0		0	3	2
Total loans	$ 3,857,879,000			$ 3,857,879,000		4,157,787,000
Increase (Decrease) in Finance Receivables				(344,400,000)
Commercial business | SBA, Paycheck Protection Program Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	336,600,000			336,600,000		452,700,000
Commercial business | TDR Loans on Accrual Status
Financing Receivable, Allowance for Credit Loss [Line Items]
Total TDR loans	8,441,000			$ 8,441,000		11,411,000
Number of loans | loan		25		20
Consumer and other
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss, writeoff	$ 110,000		$ 237,000	$ 251,000	$ 1,033,000
Number of loans | loan	0		2	5	6
Total loans	$ 52,374,000			$ 52,374,000		51,060,000
Consumer and other | TDR Loans on Accrual Status
Financing Receivable, Allowance for Credit Loss [Line Items]
Total TDR loans	213,000			$ 213,000		172,000
Number of loans | loan		16		13
Residential Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss, writeoff	$ 923,000		$ 0	$ 923,000	$ 0
Number of loans | loan	0		0	0	0
Total loans	$ 599,781,000			$ 599,781,000		582,232,000
Financing Receivable, Purchase				215,000,000
Residential Portfolio Segment | TDR Loans on Accrual Status
Financing Receivable, Allowance for Credit Loss [Line Items]
Total TDR loans	$ 0			0		$ 0
Multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Increase (Decrease) in Finance Receivables				$ 172,700,000
Minimum
Financing Receivable, Allowance for Credit Loss [Line Items]
Temporary modifications, period of interest only payments				3 months
Maximum
Financing Receivable, Allowance for Credit Loss [Line Items]
Temporary modifications, period of interest only payments				6 months

Loans Receivable and Allowan_11

Loans Receivable and Allowance for Credit Losses - Allowance for Loans, by Portfolio Segment and Evaluation Method (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Loans by Portfolio Segment and Impairment Method [Abstract]
Individually evaluated loans	$ 94,296		$ 123,203
ACL on individually evaluated loans	$ 6,437		$ 7,325
Individually evaluated loans ACL coverage	6.83%		5.95%
Collectively evaluated loans	$ 13,324,395		$ 13,440,010
ACL on collectively evaluated loans	$ 130,337		$ 199,416
Collectively evaluated loans ACL coverage	0.98%		1.48%
Total loans	$ 13,418,691		$ 13,563,213
Allowance for credit loss	$ 136,774	$ 189,452	$ 206,741	$ 179,849	$ 161,771	$ 94,144
Total ACL to total loans	1.02%		1.52%
Real estate loans
Loans by Portfolio Segment and Impairment Method [Abstract]
Individually evaluated loans	$ 72,776		$ 93,476
ACL on individually evaluated loans	3,025		3,683
Collectively evaluated loans	8,835,881		8,678,658
ACL on collectively evaluated loans	102,544		158,513
Total loans	8,908,657		8,772,134
Allowance for credit loss	105,569	155,253	162,196	129,624	119,030	53,593
Commercial business
Loans by Portfolio Segment and Impairment Method [Abstract]
Individually evaluated loans	19,660		25,706
ACL on individually evaluated loans	$ 3,376		$ 3,575
Individually evaluated loans ACL coverage	17.17%		13.91%
Collectively evaluated loans	$ 3,838,219		$ 4,132,081
ACL on collectively evaluated loans	$ 23,996		$ 35,580
Collectively evaluated loans ACL coverage	0.63%		0.86%
Total loans	$ 3,857,879		$ 4,157,787
Allowance for credit loss	$ 27,372	29,500	$ 39,155	44,209	35,493	33,032
Total ACL to total loans	0.71%		0.94%
Residential Portfolio Segment
Loans by Portfolio Segment and Impairment Method [Abstract]
Individually evaluated loans	$ 1,599		$ 3,416
ACL on individually evaluated loans	$ 9		$ 25
Individually evaluated loans ACL coverage	0.56%		0.73%
Collectively evaluated loans	$ 598,182		$ 578,816
ACL on collectively evaluated loans	$ 2,680		$ 4,202
Collectively evaluated loans ACL coverage	0.45%		0.73%
Total loans	$ 599,781		$ 582,232
Allowance for credit loss	$ 2,689	3,612	$ 4,227	4,699	5,868	5,925
Total ACL to total loans	0.45%		0.73%
Consumer
Loans by Portfolio Segment and Impairment Method [Abstract]
Individually evaluated loans	$ 261		$ 605
ACL on individually evaluated loans	$ 27		$ 42
Individually evaluated loans ACL coverage	10.34%		6.94%
Collectively evaluated loans	$ 52,113		$ 50,455
ACL on collectively evaluated loans	$ 1,117		$ 1,121
Collectively evaluated loans ACL coverage	2.14%		2.22%
Total loans	$ 52,374		$ 51,060
Allowance for credit loss	$ 1,144	$ 1,087	$ 1,163	$ 1,317	$ 1,380	$ 1,594
Total ACL to total loans	2.18%		2.28%
Residential Mortgage [Member] | Real estate loans
Loans by Portfolio Segment and Impairment Method [Abstract]
Individually evaluated loans	$ 0		$ 0
ACL on individually evaluated loans	0		0
Collectively evaluated loans	60,051		54,795
ACL on collectively evaluated loans	$ 371		$ 391
Collectively evaluated loans ACL coverage	0.62%		0.71%
Total loans	$ 60,051		$ 54,795
Allowance for credit loss	$ 371		$ 391
Total ACL to total loans	0.62%		0.71%
Commercial | Real estate loans
Loans by Portfolio Segment and Impairment Method [Abstract]
Individually evaluated loans	$ 72,776		$ 74,753
ACL on individually evaluated loans	$ 3,025		$ 2,862
Individually evaluated loans ACL coverage	4.16%		3.83%
Collectively evaluated loans	$ 8,529,743		$ 8,351,206
ACL on collectively evaluated loans	$ 100,536		$ 156,665
Collectively evaluated loans ACL coverage	1.18%		1.88%
Total loans	$ 8,602,519		$ 8,425,959
Allowance for credit loss	$ 103,561		$ 159,527
Total ACL to total loans	1.20%		1.89%
Construction | Real estate loans
Loans by Portfolio Segment and Impairment Method [Abstract]
Individually evaluated loans	$ 0		$ 18,723
ACL on individually evaluated loans	0		$ 821
Individually evaluated loans ACL coverage			4.38%
Collectively evaluated loans	246,087		$ 272,657
ACL on collectively evaluated loans	$ 1,637		$ 1,457
Collectively evaluated loans ACL coverage	0.67%		0.53%
Total loans	$ 246,087		$ 291,380
Allowance for credit loss	$ 1,637		$ 2,278
Total ACL to total loans	0.67%		0.78%

Loans Receivable and Allowan_12

Loans Receivable and Allowance for Credit Losses - Troubled Debt Restructurings on Financing Receivables (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021USD ($)loan	Mar. 31, 2021loan	Sep. 30, 2020USD ($)loan	Sep. 30, 2021USD ($)loan	Sep. 30, 2020USD ($)loan	Dec. 31, 2020USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	$ 54,447			$ 54,447		$ 51,609
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0		4	14	15
Balance	$ 0		$ 1,785	$ 12,495	$ 4,135
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	8		7	10	12
Balance	$ 11,644		$ 3,085	$ 11,775	$ 4,300
ACL for TDRs modified during period			342	89	661
Total charge-offs of TDR loans modified	0		0	0	0
ACL for the TDRs that had payment defaults	51		4	84	67
Total charge offs for TDR loans that had payment defaults	0		$ 0	0	$ 0
Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	18,515			18,515		16,745
Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	28,659			28,659		26,520
Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	$ 7,273			$ 7,273		8,344
Real estate | Residential
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0		0	0	0
Balance	$ 0		$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0		0	0	0
Balance	$ 0		$ 0	$ 0	$ 0
Real estate | Commercial | Retail
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0		1	4	2
Balance	$ 0		$ 1,007	$ 6,922	$ 1,613
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	4		1	4	1
Balance	$ 6,988		$ 606	$ 6,988	$ 606
Real estate | Commercial | Hotel & motel
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0		0	0	0
Balance	$ 0		$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0		0	0	0
Balance	$ 0		$ 0	$ 0	$ 0
Real estate | Commercial | Gas station & car wash
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0		0	1	2
Balance	$ 0		$ 0	$ 575	$ 515
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0		0	0	1
Balance	$ 0		$ 0	$ 0	$ 471
Real estate | Commercial | Mixed use
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0		1	1	2
Balance	$ 0		$ 767	$ 4,626	$ 1,233
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	1		0	1	1
Balance	$ 4,626		$ 0	$ 4,626	$ 466
Real estate | Commercial | Industrial & warehouse
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0		0	0	1
Balance	$ 0		$ 0	$ 0	$ 259
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0		1	0	2
Balance	$ 0		$ 2,326	$ 0	$ 2,586
Real estate | Commercial | Other
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0		0	0	0
Balance	$ 0		$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0		1	0	1
Balance	$ 0		$ 133	$ 0	$ 133
Real estate | Construction
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0		0	0	0
Balance	$ 0		$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0		0	0	0
Balance	$ 0		$ 0	$ 0	$ 0
Real estate | TDR Loans on Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	30,855			30,855		25,771
Real estate | TDR Loans on Accrual Status | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	30,900			$ 30,900		25,800
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan		33		30
Real estate | TDR Loans on Accrual Status | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	8,034			$ 8,034		8,328
Real estate | TDR Loans on Accrual Status | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	17,567			17,567		11,331
Real estate | TDR Loans on Accrual Status | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	5,254			5,254		6,112
Real estate | TDR Loans on Nonaccrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	9,674			9,674		8,423
Real estate | TDR Loans on Nonaccrual Status | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	9,145			9,145		7,074
Real estate | TDR Loans on Nonaccrual Status | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	285			285		925
Real estate | TDR Loans on Nonaccrual Status | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	$ 244			$ 244		424
Commercial business
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0		0	3	2
Balance	$ 0		$ 0	$ 319	$ 481
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0		0	1	1
Balance	$ 0		$ 0	$ 120	$ 14
Commercial business | TDR Loans on Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	8,441			$ 8,441		11,411
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan		25		20
Commercial business | TDR Loans on Accrual Status | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	808			$ 808		814
Commercial business | TDR Loans on Accrual Status | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	7,275			7,275		10,219
Commercial business | TDR Loans on Accrual Status | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	358			358		378
Commercial business | TDR Loans on Nonaccrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	5,147			5,147		5,715
Commercial business | TDR Loans on Nonaccrual Status | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	473			473		471
Commercial business | TDR Loans on Nonaccrual Status | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	3,257			3,257		3,814
Commercial business | TDR Loans on Nonaccrual Status | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	$ 1,417			$ 1,417		1,430
Residential mortgage
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0		0	0	0
Balance	$ 0		$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0		0	0	0
Balance	$ 0		$ 0	$ 0	$ 0
Residential mortgage | TDR Loans on Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	0			0		0
Residential mortgage | TDR Loans on Accrual Status | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	0			0		0
Residential mortgage | TDR Loans on Accrual Status | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	0			0		0
Residential mortgage | TDR Loans on Accrual Status | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	0			0		0
Residential mortgage | TDR Loans on Nonaccrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	0			0		0
Residential mortgage | TDR Loans on Nonaccrual Status | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	0			0		0
Residential mortgage | TDR Loans on Nonaccrual Status | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	0			0		0
Residential mortgage | TDR Loans on Nonaccrual Status | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	$ 0			$ 0		0
Consumer and other
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0		2	5	6
Balance	$ 0		$ 11	$ 53	$ 34
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	3		4	4	5
Balance	$ 30		$ 20	$ 41	$ 24
Consumer and other | TDR Loans on Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	213			$ 213		172
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan		16		13
Consumer and other | TDR Loans on Accrual Status | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	55			$ 55		58
Consumer and other | TDR Loans on Accrual Status | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	158			158		114
Consumer and other | TDR Loans on Accrual Status | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	0			0		0
Consumer and other | TDR Loans on Nonaccrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	117			117		117
Consumer and other | TDR Loans on Nonaccrual Status | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	0			0		0
Consumer and other | TDR Loans on Nonaccrual Status | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	117			117		117
Consumer and other | TDR Loans on Nonaccrual Status | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total TDRs	$ 0			$ 0		$ 0

Leases - Additional Information

Leases - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)lease	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Lessee, Lease, Description [Line Items]
Accounting Standards Update [Extensible List]				Accounting Standards Update 2016-13 [Member]	Accounting Standards Update 2020-06 [Member]
Operating lease right-of-use assets	$ 50,603,000		$ 50,603,000		$ 47,653,000
Extension options, term of extension			5 years
Operating lease liabilities	55,095,000		$ 55,095,000		$ 52,030,000
Short-term operating lease liability	12,200,000		12,200,000
Long-term operating lease liability	42,900,000		$ 42,900,000
Number of leases extended | lease			12
Number of new leases | lease			1
Rent expense	$ 4,600,000	$ 4,600,000	$ 13,600,000	$ 13,700,000
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term for operating leases	1 year		1 year
Extension options, term of extension			3 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term for operating leases	11 years		11 years
Extension options, term of extension			5 years

Leases - Net Lease Cost (Detail

Leases - Net Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating lease cost	$ 3,778	$ 3,928	$ 11,498	$ 11,752
Short term lease cost	0	0	0	0
Variable lease cost	892	864	2,393	2,403
Sublease income	(102)	(169)	(354)	(595)
Net lease cost	$ 4,568	$ 4,623	$ 13,537	$ 13,560

Leases - Other Information (Det

Leases - Other Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows for operating leases	$ 10,991	$ 11,320
Right-of-use assets obtained in exchange for lease liabilities, net	$ 965	$ 0
Weighted-average remaining lease term - operating leases	5 years 4 months 24 days	5 years 3 months 18 days
Weighted-average discount rate - operating leases	2.56%	2.99%

Leases - Maturities of Remainin

Leases - Maturities of Remaining Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
2021	$ 3,694
2022	12,704
2023	10,942
2024	9,335
2025	7,634
2026 and thereafter	14,853
Total lease payments	59,162
Less: imputed interest	4,067
Total lease obligations	$ 55,095	$ 52,030

Deposits (Details)

Deposits (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Deposits Disclosure [Line Items]
Time Deposits, $250,000 or More	$ 1,540,000,000	$ 1,850,000,000
Securities pledged as collateral	393,700,000	376,100,000
Brokered deposits	375,300,000	1,140,000,000
Noninterest bearing	6,007,586,000	4,814,254,000
Money market and NOW accounts	5,871,567,000	5,232,413,000
Savings deposits	314,603,000	300,770,000
Time deposits	2,868,771,000	3,986,475,000
Total deposits	$ 15,062,527,000	$ 14,333,912,000
Percent of total deposit balance, by type	100.00%	100.00%
Money market and NOW accounts
Deposits Disclosure [Line Items]
Brokered deposits	$ 375,100,000	$ 735,000,000
Percent of total deposit balance, by type	39.00%	36.00%
Time deposit accounts
Deposits Disclosure [Line Items]
Brokered deposits	$ 192,000	$ 400,600,000
Noninterest Bearing Demand Deposits
Deposits Disclosure [Line Items]
Percent of total deposit balance, by type	40.00%	34.00%
Savings Deposits
Deposits Disclosure [Line Items]
Percent of total deposit balance, by type	2.00%	2.00%
Bank Time Deposits
Deposits Disclosure [Line Items]
Percent of total deposit balance, by type	19.00%	28.00%
California State Treasurer
Deposits Disclosure [Line Items]
Time Deposits, $250,000 or More	$ 300,000,000	$ 300,000,000
Required eligible collateral pledge on outstanding deposits, minimum percentage	110.00%
Securities pledged as collateral	$ 390,600,000	$ 368,200,000

Borrowings - Narrative (Details

Borrowings - Narrative (Details)	9 Months Ended
	Sep. 30, 2021USD ($)security	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Debt Instrument [Line Items]
Percent of assets	25.00%
Maximum borrowing capacity	$ 4,370,000,000		$ 4,180,000,000
Percent outstanding advances	100.00%
Pledged as collateral	$ 0		0
FHLB advances	200,000,000		250,000,000
Proceeds from FHLB advances	1,540,000,000	$ 1,010,000,000
Remaining borrowing capacity	4,150,000,000
Federal funds purchased	$ 0		0
Percent of qualifying assets (up to)	99.00%
Securities pledged as collateral	$ 393,700,000		$ 376,100,000
Weighted Average
Debt Instrument [Line Items]
FHLB advances, interest rate	1.27%		1.07%
Minimum
Debt Instrument [Line Items]
FHLB advances, interest rate	0.15%
Maximum
Debt Instrument [Line Items]
FHLB advances, interest rate	2.39%
Qualifying Loans
Debt Instrument [Line Items]
Asset balance used to determine maximum borrowing capacity from federal reserve bank	$ 725,000,000
FRB Discount Window
Debt Instrument [Line Items]
Number of securities pledged as collateral | security	1
Securities pledged as collateral	$ 1,800,000
Total available borrowing capacity	517,000,000		$ 616,000,000
Amount outstanding	0		0
Unsecured Credit Facility with FHLB
Debt Instrument [Line Items]
Unsecured credit facility, maximum borrowing capacity	81,200,000		81,200,000
Mortgage Loans on Real Estate
Debt Instrument [Line Items]
Pledged as collateral, FHLB	$ 6,720,000,000		$ 6,950,000,000

Borrowings - Maturities of FHLB

Borrowings - Maturities of FHLB Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
2021	$ 100,000
2022	100,000
FHLB advances	$ 200,000	$ 250,000

Subordinated Debentures and C_3

Subordinated Debentures and Convertible Notes - Narrative (Details)	Jun. 07, 2018$ / shares	Sep. 30, 2021USD ($)grantorTrust	Sep. 30, 2020USD ($)	Jun. 30, 2021	Sep. 30, 2021USD ($)grantorTrust	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)	Jun. 06, 2018USD ($)
Subordinated Borrowing [Line Items]
Number of wholly owned subsidiary grantor trusts | grantorTrust		9			9
Amount of pooled trust preferred securities issued		$ 126,000,000			$ 126,000,000
Right to defer consecutive payments of interest, maximum term					5 years
Carrying value of Debentures		105,057,000			$ 105,057,000		$ 104,178,000
Interest on other borrowings and convertible notes		2,290,000	$ 3,389,000		6,892,000	$ 10,764,000
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Additional paid-in capital
Subordinated Borrowing [Line Items]
Adjustments to additional paid in capital, equity component of convertible debt, net of tax		18,300,000
Other assets
Subordinated Borrowing [Line Items]
Investment in common trust securities		3,900,000			3,900,000		3,900,000
Carrying Value of Debentures
Subordinated Borrowing [Line Items]
Carrying value of Debentures		105,057,000			105,057,000		104,200,000
Remaining discounts on acquired Debentures		24,800,000			24,800,000		$ 25,700,000
Trust Preferred Securities Subject to Mandatory Redemption
Subordinated Borrowing [Line Items]
Amount of pooled trust preferred securities issued		$ 126,000,000			$ 126,000,000
Percent included in tier one capital, maximum		25.00%			25.00%
Excess of percent threshold included in tier two capital		25.00%			25.00%
Convertible Notes
Subordinated Borrowing [Line Items]
Aggregate principal amount issued		$ 217,500,000			$ 217,500,000			$ 217,500,000
Interest rate								2.00%
Initial conversion rate	0.0450760				0.0450760
Initial conversion price (in dollars per share) | $ / shares	$ 22.18
Premium percentage to closing stock price on date of pricing of the notes	22.50%
Call option, percentage of principal amount in cash	100.00%
Repurchase or put option, percentage of principal amount in cash	100.00%
Interest expense on convertible notes		1,300,000	$ 2,400,000		$ 4,000,000	$ 7,100,000
Number of outstanding years for which non-cash interest expense and issuance cost capitalization expense will be recorded	5 years			5 years	5 years
Convertible Notes | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06
Subordinated Borrowing [Line Items]
Interest on other borrowings and convertible notes		$ 1,000,000			$ 3,100,000
Convertible Notes | Discount Rate
Subordinated Borrowing [Line Items]
Discount rate	0.0425

Subordinated Debentures and C_4

Subordinated Debentures and Convertible Notes - Summary of Trust Preferred Securities and Debentures (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 126,000,000
Carrying Value of Debentures	105,057,000	$ 104,178,000
Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	126,000,000
Carrying Value of Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Debentures	$ 105,057,000	$ 104,200,000
Nara Capital Trust III
Subordinated Borrowing [Line Items]
Current Rate	3.266%
Nara Capital Trust III | Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 5,000,000
Nara Capital Trust III | Carrying Value of Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Debentures	$ 5,155,000
Nara Statutory Trust IV
Subordinated Borrowing [Line Items]
Current Rate	2.976%
Nara Statutory Trust IV | Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 5,000,000
Nara Statutory Trust IV | Carrying Value of Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Debentures	$ 5,155,000
Nara Statutory Trust V
Subordinated Borrowing [Line Items]
Current Rate	3.07%
Nara Statutory Trust V | Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 10,000,000
Nara Statutory Trust V | Carrying Value of Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Debentures	$ 10,310,000
Nara Statutory Trust VI
Subordinated Borrowing [Line Items]
Current Rate	1.766%
Nara Statutory Trust VI | Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 8,000,000
Nara Statutory Trust VI | Carrying Value of Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Debentures	$ 8,248,000
Center Capital Trust I
Subordinated Borrowing [Line Items]
Current Rate	2.976%
Center Capital Trust I | Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 18,000,000
Center Capital Trust I | Carrying Value of Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Debentures	$ 14,631,000
Wilshire Trust II
Subordinated Borrowing [Line Items]
Current Rate	1.91%
Wilshire Trust II | Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 20,000,000
Wilshire Trust II | Carrying Value of Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Debentures	$ 16,140,000
Wilshire Trust III
Subordinated Borrowing [Line Items]
Current Rate	1.516%
Wilshire Trust III | Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 15,000,000
Wilshire Trust III | Carrying Value of Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Debentures	$ 11,471,000
Wilshire Trust IV
Subordinated Borrowing [Line Items]
Current Rate	1.496%
Wilshire Trust IV | Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 25,000,000
Wilshire Trust IV | Carrying Value of Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Debentures	$ 18,555,000
Saehan Capital Trust I
Subordinated Borrowing [Line Items]
Current Rate	1.752%
Saehan Capital Trust I | Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 20,000,000
Saehan Capital Trust I | Carrying Value of Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Debentures	$ 15,392,000

Subordinated Debentures and C_5

Subordinated Debentures and Convertible Notes - Schedule of Convertible Debt (Details) - USD ($) $ in Thousands	Jun. 07, 2018	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Carrying Amount
Interest on other borrowings and convertible notes		$ 2,290	$ 3,389		$ 6,892	$ 10,764
Convertible Notes
Debt Instrument [Line Items]
Amortization/ Capitalization Period	5 years			5 years	5 years
Gross Carrying Amount
Convertible notes principal balance		217,500			$ 217,500		$ 217,500
Discount							(21,880)
Issuance costs to be capitalized		(4,119)			(4,119)		(4,119)
Carrying balance of convertible notes		213,381			213,381		191,501
Accumulated Amortization / Capitalization
Discount							10,951
Issuance costs to be capitalized		2,593			2,593		2,113
Carrying balance of convertible notes		2,593			2,593		13,064
Carrying Amount
Convertible notes principal balance		217,500			217,500		217,500
Discount							(10,929)
Issuance costs to be capitalized		(1,526)			(1,526)		(2,006)
Carrying balance of convertible notes		$ 215,974			$ 215,974		$ 204,565

Derivative Financial Instrume_3

Derivative Financial Instruments (Details)	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2021USD ($)derivative	Sep. 30, 2020USD ($)	Jun. 30, 2021	Sep. 30, 2021USD ($)derivative	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest Expense	$ 12,570,000	$ 27,583,000		$ 41,911,000	$ 110,407,000
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	(88,000)
Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest Expense		$ (21,000)		(227,000)	$ (21,000)
Not Designated as Hedging Instrument | Interest rate swaps | Correspondent Banks | Other liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 453,289,000			$ 453,289,000		$ 503,929,000
Weighted average remaining term (years)			6 years 9 months 18 days	5 years 9 months 18 days
Received/Pay variable rate (weighted average)	2.18%			2.18%		2.26%
Pay/Received fixed rate (weighted average)	3.97%			3.97%		3.86%
Estimated fair value	$ (18,802,000)			$ (18,802,000)		$ (34,606,000)
Not Designated as Hedging Instrument | Interest rate swaps | Correspondent Banks | Other assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 98,916,000			$ 98,916,000		$ 0
Weighted average remaining term (years)			0 years	8 years 7 months 6 days
Received/Pay variable rate (weighted average)	2.10%			2.10%		0.00%
Pay/Received fixed rate (weighted average)	2.90%			2.90%		0.00%
Estimated fair value	$ 2,395,000			$ 2,395,000		$ 0
Not Designated as Hedging Instrument | Interest rate swaps | Customers | Other liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 98,916,000			$ 98,916,000		$ 0
Weighted average remaining term (years)			0 years	8 years 7 months 6 days
Received/Pay variable rate (weighted average)	2.10%			2.10%		0.00%
Pay/Received fixed rate (weighted average)	2.90%			2.90%		0.00%
Estimated fair value	$ (2,395,000)			$ (2,395,000)		$ 0
Not Designated as Hedging Instrument | Interest rate swaps | Customers | Other assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 453,289,000			$ 453,289,000		$ 503,929,000
Weighted average remaining term (years)			6 years 9 months 18 days	5 years 9 months 18 days
Received/Pay variable rate (weighted average)	2.18%			2.18%		2.26%
Pay/Received fixed rate (weighted average)	3.97%			3.97%		3.86%
Estimated fair value	$ 18,802,000			$ 18,802,000		$ 34,606,000
Not Designated as Hedging Instrument | Risk participation agreement
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	111,400,000			111,400,000		112,800,000
Credit valuation adjustment	52,000			52,000		398,000
Designated as Hedging Instrument | Interest rate swaps | Other liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 0			$ 0		$ 100,000,000
Weighted average remaining term (years)			4 years 3 months 18 days	0 years
Received/Pay variable rate (weighted average)	0.00%			0.00%		0.22%
Pay/Received fixed rate (weighted average)	0.00%			0.00%		0.49%
Estimated fair value	$ 0			$ 0		$ (602,000)
Designated as Hedging Instrument | Interest rate swaps | Other assets
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 100,000,000			$ 100,000,000		$ 0
Weighted average remaining term (years)			0 years	3 years 6 months
Received/Pay variable rate (weighted average)	0.14%			0.14%		0.00%
Pay/Received fixed rate (weighted average)	0.49%			0.49%		0.00%
Estimated fair value	$ 1,041,000			$ 1,041,000		$ 0
Designated as Hedging Instrument | Cash Flow Hedge | Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 100,000,000			$ 100,000,000		$ 100,000,000
Number of derivative instruments held | derivative	1			1		1

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of Derivative Notional Amounts and Fair Values (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Interest rate lock commitments
Derivative [Line Items]
Notional amount, derivative asset	$ 22,479,000	$ 37,507,000
Fair value, derivative asset	256,000	679,000
Notional amount, derivative liability	450,000	6,267,000
Fair value, derivative liability	(1,000)	(31,000)
Notional amount	21,300,000	43,800,000
Forward sale contracts related to mortgage banking | Short
Derivative [Line Items]
Notional amount, derivative asset	21,394,000	8,641,000
Fair value, derivative asset	98,000	45,000
Notional amount, derivative liability	5,693,000	35,133,000
Fair value, derivative liability	(23,000)	(79,000)
Risk participation agreement | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount	$ 111,400,000	$ 112,800,000

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Supply Commitment [Line Items]
Loss contingencies for all legal claims	$ 144,000	$ 1,300,000
Loss contingencies for all legal claims	144,000	1,300,000
Commitments to extend credit
Supply Commitment [Line Items]
Commitments and letters of credit	2,373,741,000	2,137,178,000
Standby letters of credit
Supply Commitment [Line Items]
Commitments and letters of credit	117,132,000	108,834,000
Other letters of credit
Supply Commitment [Line Items]
Commitments and letters of credit	55,897,000	40,508,000
Commitments to fund investments in affordable housing partnerships
Supply Commitment [Line Items]
Commitments and letters of credit	$ 10,286,000	$ 15,148,000

Goodwill, Intangible Assets, _3

Goodwill, Intangible Assets, and Servicing Assets - Intangible Assets (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment	$ 0		$ 0
Goodwill	464,450,000		464,450,000		$ 464,450,000
Core Deposits
Finite-Lived Intangible Assets [Line Items]
Amortization expense related to core deposit intangible assets	509,000	$ 531,000	1,500,000	$ 1,600,000
Gross Amount	20,901,000		20,901,000		20,901,000
Accumulated Amortization	(12,721,000)		(12,721,000)		(11,193,000)
Carrying Amount	8,180,000		$ 8,180,000		9,708,000
Foster Bankshares acquisition | Core Deposits
Finite-Lived Intangible Assets [Line Items]
Amortization Period			10 years
Gross Amount	2,763,000		$ 2,763,000		2,763,000
Accumulated Amortization	(2,459,000)		(2,459,000)		(2,322,000)
Carrying Amount	304,000		$ 304,000		441,000
Wilshire Bancorp acquisition | Core Deposits
Finite-Lived Intangible Assets [Line Items]
Amortization Period			10 years
Gross Amount	18,138,000		$ 18,138,000		18,138,000
Accumulated Amortization	(10,262,000)		(10,262,000)		(8,871,000)
Carrying Amount	$ 7,876,000		$ 7,876,000		$ 9,267,000
Maximum | Core Deposits
Finite-Lived Intangible Assets [Line Items]
Amortization Period			10 years

Goodwill, Intangible Assets, _4

Goodwill, Intangible Assets, and Servicing Assets - Servicing Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance at beginning of period	$ 11,566	$ 14,164	$ 12,692	$ 12,692	$ 16,417
Additions through originations of servicing assets	710	1,190		2,039	2,326
Amortization	(1,489)	(1,636)		(3,944)	(5,025)
Balance at end of period	10,787	$ 13,718	$ 11,566	10,787	$ 13,718
Principal balances of loans serviced for other institutions	$ 1,120,000			$ 1,120,000		$ 1,230,000
SBA Servicing Assets: Weighted-average discount rate			9.93%	12.48%
SBA Servicing Assets: Constant prepayment rate			14.40%	14.37%
Mortgage Servicing Assets: Weighted-average discount rate			8.26%	8.63%
Mortgage Servicing Assets: Constant prepayment rate			8.63%	9.19%

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income tax provision	$ 19,912,000	$ 9,254,000	$ 51,644,000	$ 25,487,000
Pretax income	$ 75,411,000	$ 39,744,000	$ 204,593,000	$ 108,683,000
Effective income tax rate	26.40%	23.28%	25.24%	23.45%
Unrecognized tax benefits	$ 2,800,000		$ 2,800,000		$ 2,800,000
Interest accrued	347,000		347,000		276,000
Penalties accrued	0		0		$ 0
Decrease in unrecognized tax benefits is reasonably possible	$ 902,000		$ 902,000

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value, Recurring (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Costs to sell percentage	8.50%
Assets:
Equity investments with readily determinable fair value	$ 58,512	$ 59,699
Recurring basis
Assets:
Equity investments with readily determinable fair value	27,077	27,611
Recurring basis | Interest rate swaps
Assets:
Derivative assets	21,197	34,606
Liabilities:
Derivative liabilities	21,197	34,606
Recurring basis | Mortgage banking derivatives
Assets:
Derivative assets	354	724
Liabilities:
Derivative liabilities	24	110
Recurring basis | Other derivatives
Assets:
Derivative assets	1,041
Liabilities:
Derivative liabilities	52	1,000
Recurring basis | Collateralized mortgage obligations
Assets:
Securities available for sale, at fair value	1,071,188	1,001,317
Recurring basis | Mortgage-backed securities: Residential
Assets:
Securities available for sale, at fair value	763,395	681,013
Recurring basis | Mortgage-backed securities: Commercial
Assets:
Securities available for sale, at fair value	591,661	507,879
Recurring basis | Corporate securities
Assets:
Securities available for sale, at fair value	22,578	6,134
Recurring basis | Municipal securities
Assets:
Securities available for sale, at fair value	102,064	89,268
Recurring basis | Asset-backed Securities
Assets:
Securities available for sale, at fair value	118,603
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Equity investments with readily determinable fair value	27,077	27,611
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swaps
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage banking derivatives
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other derivatives
Assets:
Derivative assets	0
Liabilities:
Derivative liabilities	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized mortgage obligations
Assets:
Securities available for sale, at fair value	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities: Residential
Assets:
Securities available for sale, at fair value	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities: Commercial
Assets:
Securities available for sale, at fair value	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate securities
Assets:
Securities available for sale, at fair value	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal securities
Assets:
Securities available for sale, at fair value	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed Securities
Assets:
Securities available for sale, at fair value	0
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Equity investments with readily determinable fair value	0	0
Recurring basis | Significant Other Observable Inputs (Level 2) | Interest rate swaps
Assets:
Derivative assets	21,197	34,606
Liabilities:
Derivative liabilities	21,197	34,606
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage banking derivatives
Assets:
Derivative assets	354	724
Liabilities:
Derivative liabilities	24	110
Recurring basis | Significant Other Observable Inputs (Level 2) | Other derivatives
Assets:
Derivative assets	1,041
Liabilities:
Derivative liabilities	0	602
Recurring basis | Significant Other Observable Inputs (Level 2) | Collateralized mortgage obligations
Assets:
Securities available for sale, at fair value	1,071,188	1,001,317
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities: Residential
Assets:
Securities available for sale, at fair value	763,395	681,013
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities: Commercial
Assets:
Securities available for sale, at fair value	591,661	507,879
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities
Assets:
Securities available for sale, at fair value	22,578	6,134
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal securities
Assets:
Securities available for sale, at fair value	101,009	88,246
Recurring basis | Significant Other Observable Inputs (Level 2) | Asset-backed Securities
Assets:
Securities available for sale, at fair value	118,603
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Equity investments with readily determinable fair value	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Interest rate swaps
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Mortgage banking derivatives
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Other derivatives
Assets:
Derivative assets	0
Liabilities:
Derivative liabilities	52	398
Recurring basis | Significant Unobservable Inputs (Level 3) | Collateralized mortgage obligations
Assets:
Securities available for sale, at fair value	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities: Residential
Assets:
Securities available for sale, at fair value	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities: Commercial
Assets:
Securities available for sale, at fair value	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate securities
Assets:
Securities available for sale, at fair value	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Municipal securities
Assets:
Securities available for sale, at fair value	1,055	$ 1,022
Recurring basis | Significant Unobservable Inputs (Level 3) | Asset-backed Securities
Assets:
Securities available for sale, at fair value	$ 0
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Costs to sell percentage	8.50%
Discount Rate | Accounts Receivable | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.20
Discount Rate | Accounts Receivable | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.60
Discount Rate | Inventory | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.50
Discount Rate | Inventory | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.70

Fair Value Measurements - Rollf

Fair Value Measurements - Rollforward of Level 3 Assets (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 1,058	$ 1,066
Change in fair value included in other comprehensive income (loss)	(3)	(18)
Ending Balance	1,055	1,048	$ 1,055	$ 1,048
Other derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	64	223	398	0
Change in fair value included in other comprehensive income (loss)	(12)	(24)	(346)	199
Ending Balance	52	199	52	199
Municipal Bonds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance			1,022	1,076
Change in fair value included in other comprehensive income (loss)			33	(28)
Ending Balance	$ 1,055	$ 1,048	$ 1,055	$ 1,048

Fair Value Measurements - Ass_2

Fair Value Measurements - Assets Measured at Fair Value, Non-Recurring (Details) - Non-recurring basis - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Real estate loans
Assets:
Assets	$ 12,882	$ 21,688
Commercial business
Assets:
Assets	3,504	7,694
OREO
Assets:
Assets	14,783	19,260
Loans held for sale, net
Assets:
Assets	131,176	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Real estate loans
Assets:
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial business
Assets:
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | OREO
Assets:
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale, net
Assets:
Assets	0	0
Significant Other Observable Inputs (Level 2) | Real estate loans
Assets:
Assets	0	0
Significant Other Observable Inputs (Level 2) | Commercial business
Assets:
Assets	0	0
Significant Other Observable Inputs (Level 2) | OREO
Assets:
Assets	0	0
Significant Other Observable Inputs (Level 2) | Loans held for sale, net
Assets:
Assets	131,176	0
Significant Unobservable Inputs (Level 3) | Real estate loans
Assets:
Assets	12,882	21,688
Significant Unobservable Inputs (Level 3) | Commercial business
Assets:
Assets	3,504	7,694
Significant Unobservable Inputs (Level 3) | OREO
Assets:
Assets	14,783	19,260
Significant Unobservable Inputs (Level 3) | Loans held for sale, net
Assets:
Assets	$ 0	$ 0

Fair Value Measurements - Total

Fair Value Measurements - Total Net Gains Losses on Assets Measured at Fair Value on a Non-Recurring Basis (Details) - Change during period - Non-recurring basis - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Loans Receivable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gains (losses), fair value	$ (6,121)	$ 0	$ (17,900)	$ 0
Loans Receivable | Real estate loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gains (losses), fair value	(1,083)	(5,951)	(1,496)	(8,108)
Loans Receivable | Commercial business
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gains (losses), fair value	(2,025)	(2,902)	(2,025)	(5,470)
OREO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gains (losses), fair value	$ (259)	$ (1,682)	$ (582)	$ (4,118)

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial Assets:
Equity investments without readily determinable fair values	$ 31,400	$ 32,100
Level 1 | Carrying Amount
Financial Assets:
Cash and cash equivalents	627,352	350,579
Financial Liabilities:
Convertible notes, net	215,974	204,565
Level 1 | Estimated Fair Value
Financial Assets:
Cash and cash equivalents	627,352	350,579
Financial Liabilities:
Convertible notes, net	215,325	201,731
Level 2/3 | Carrying Amount
Financial Assets:
Accrued interest receivable	47,102	59,430
Level 2/3 | Estimated Fair Value
Financial Assets:
Accrued interest receivable	47,102	59,430
Level 2 | Carrying Amount
Financial Assets:
Interest bearing deposits in other financial institutions	12,340	28,642
Equity investments without readily determinable fair values	31,435	32,088
Loans held for sale	179,117	17,743
Customers’ liabilities on acceptances	1,808	1,184
Financial Liabilities:
Noninterest bearing deposits	6,007,586	4,814,254
Saving and other interest bearing demand deposits	6,186,170	5,533,183
Time deposits	2,868,771	3,986,475
FHLB advances	200,000	250,000
Subordinated debentures	105,057	104,178
Accrued interest payable	5,367	14,706
Acceptances outstanding	1,808	1,184
Level 2 | Estimated Fair Value
Financial Assets:
Interest bearing deposits in other financial institutions	12,348	28,669
Equity investments without readily determinable fair values	31,435	32,088
Loans held for sale	181,836	18,288
Customers’ liabilities on acceptances	1,808	1,184
Financial Liabilities:
Noninterest bearing deposits	6,007,586	4,814,254
Saving and other interest bearing demand deposits	6,186,170	5,533,183
Time deposits	2,871,600	3,992,973
FHLB advances	202,719	254,456
Subordinated debentures	114,854	98,948
Accrued interest payable	5,367	14,706
Acceptances outstanding	1,808	1,184
Level 3 | Carrying Amount
Financial Assets:
Loans receivable—net	13,281,917	13,356,472
Servicing assets, net	10,787	12,692
Level 3 | Estimated Fair Value
Financial Assets:
Loans receivable—net	13,155,789	13,428,706
Servicing assets, net	$ 13,494	$ 15,785

Stockholders' Equity - Discussi

Stockholders' Equity - Discussion of Equity (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jul. 22, 2021	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Equity [Abstract]
Total stockholders’ equity		$ 2,074,398,000	$ 2,040,561,000	$ 2,074,398,000	$ 2,040,561,000		$ 2,092,870,000	$ 2,053,745,000	$ 2,030,776,000	$ 2,036,011,000
Share repurchase program, authorized amount			$ 50,000,000		50,000,000	$ 50,000,000
Common stock repurchased and recorded as treasury stock (in shares)	2,716,034	3,487,426
Repurchase of treasury stock	$ 36,200,000	$ 47,198,000		$ 47,198,000	$ 36,180,000
Dividends paid (in dollars per share)		$ 0.14	$ 0.14	$ 0.42	$ 0.42
Allocated share-based compensation expense		$ 2,200,000	$ 2,200,000	$ 6,800,000	$ 6,000,000
Gains (Losses) on Sales of Other Real Estate		$ 12,000	$ 27,000	$ (1,000)	$ 108,000

Stockholders' Equity - Changes

Stockholders' Equity - Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 2,092,870,000	$ 2,030,776,000	$ 2,053,745,000	$ 2,036,011,000
Unrealized net gains (losses) on securities available for sale	(16,433,000)	(303,000)	(43,050,000)	41,820,000
Unrealized net gains (losses) on interest rate swaps used for cash flow hedge	120,000	54,000	1,643,000	(796,000)
Reclassification adjustments for net losses (gains) realized in net income	88,000	(7,510,000)	227,000	(7,649,000)
Tax effect	4,717,000	2,292,000	11,970,000	(9,842,000)
Other comprehensive (loss) income, net of tax	(11,508,000)	(5,467,000)	(29,210,000)	23,533,000
Balance at end of period	2,074,398,000	2,040,561,000	2,074,398,000	2,040,561,000
Accumulated other comprehensive income, net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	15,051,000	38,149,000	32,753,000	9,149,000
Other comprehensive (loss) income, net of tax	(11,508,000)	(5,467,000)	(29,210,000)	23,533,000
Balance at end of period	$ 3,543,000	$ 32,682,000	$ 3,543,000	$ 32,682,000

Stock-Based Compensation - Plan

Stock-Based Compensation - Plan Description (Details) - shares	9 Months Ended
	Sep. 30, 2021	May 23, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future grant (in shares)	2,338,326
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	16,703
ISOs, SARs, and NQSOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term	10 years
ISOs, SARs, and NQSOs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
ISOs, SARs, and NQSOs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Restricted stock, performance shares and performance units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock, restriction period	1 year
Time-based vesting of grants | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock, restriction period	3 years
2019 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares initially available for grant to participants (in shares)		4,400,000
2019 Stock Incentive Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price of common stock, percent	100.00%
2019 Stock Incentive Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term	10 years

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock Option Activity (Details) - Stock options $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding - beginning of period (in shares) | shares	851,580
Granted (in shares) | shares	0
Exercised (in shares) | shares	0
Expired (in shares) | shares	(16,703)
Forfeited (in shares) | shares	0
Outstanding - end of period (in shares) | shares	834,877
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding - beginning of period, weighted-average exercise price per share (usd per share) | $ / shares	$ 15.25
Granted - weighted average exercise price (usd per share) | $ / shares	0
Exercised - weighted average exercise price (usd per share) | $ / shares	0
Expired - weighted-average exercise price per share (usd per share) | $ / shares	17.12
Forfeited - weighted average exercise price (usd per share) | $ / shares	0
Outstanding - end of period, weighted-average exercise price per share (usd per share) | $ / shares	$ 15.22
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercisable - end of period (in shares) | shares	834,877
Options exercisable, weighted-average exercise price per share (usd per share) | $ / shares	$ 15.22
Outstanding, weighted-average remaining contractual life (years)	3 years 7 months 28 days
Options exercisable, weighted-average remaining contractual life (years)	3 years 7 months 28 days
Outstanding, aggregate intrinsic value | $	$ 1,011
Options exercisable, aggregate intrinsic value | $	$ 1,011

Stock-Based Compensation - Rest

Stock-Based Compensation - Restricted Stock and Performance Unit Activity (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Allocated share-based compensation expense	$ 2,200,000	$ 2,200,000	$ 6,800,000	$ 6,000,000
Tax benefit from compensation expense	579,000	507,000	1,700,000	1,400,000
Unrecognized compensation expense related to non-vested stock option grants	$ 0		$ 0
Restricted stock and performance units
Number of Shares
Outstanding - beginning of period (in shares)			1,718,838
Granted (in shares)			666,163
Vested (in shares)			(622,003)
Forfeited (in shares)			(164,530)
Outstanding - end of period (in shares)	1,598,468		1,598,468
Weighted-Average Grant Date Fair Value
Outstanding - beginning of period (in dollars per share)			$ 10.73
Granted (in dollars per share)			15.61
Vested (in dollars per share)			11.89
Forfeited (in dollars per share)			13.13
Outstanding - end of period (in dollars per share)	$ 12.07		$ 12.07
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Equity instruments other than options, vested in period			$ 9,400,000	3,300,000
Total compensation cost not yet recognized, period for recognition			1 year 11 months 8 days
Unrecognized compensation expense related to non-vested equity instruments other than options	$ 11,300,000		$ 11,300,000
Employee Stock Purchase Plan (ESPP)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Discount rate to the closing price, purchase date			10.00%
Maximum amount of common shares purchased under ESPP of employee's base salary, percent	20.00%		20.00%
Cap amount for shares purchased per employee			$ 25,000
Allocated share-based compensation expense	$ 135,000	$ 108,000	$ 394,000	$ 205,000

Regulatory Matters (Details)

Regulatory Matters (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2020USD ($)	Sep. 30, 2021USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-13 [Member]	Accounting Standards Update 2020-06 [Member]
Bank Subsidiary
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital, Actual Amount		$ 1,850,091	$ 1,911,158
Common equity Tier 1 capital, Actual Ratio		0.1290	0.1297
Total capital (to risk-weighted assets), Amount
Total capital, Actual		$ 2,027,534	$ 2,017,592
Tier I capital (to risk-weighted assets), Amount
Tier 1 capital, Actual		1,850,091	1,911,158
Tier I capital (to average assets), Amount
Tier 1 capital, Actual		$ 1,850,091	$ 1,911,158
Total capital and Tier I capital (to risk-weighted assets), Ratio
Total capital (to Risk Weighted Assets), Actual		0.1414	0.1370
Total capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes		0.0800	0.0800
Tier 1 capital (to Risk Weighted Assets), Actual		0.1290	0.1297
Tier 1 capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes		0.0600	0.0600
Tier 1 capital (to Risk Weighted Assets), Required To Be Well Capitalized Under Prompt Corrective Action Provisions		0.0800	0.0800
Tier I capital (to average assets), Ratio
Tier I Capital (to Average Assets), Actual (Leverage)		0.1133	0.1107
Tier I Capital (to Average Assets), Minimum For Capital Adequacy Purposes (Leverage)		0.0400	0.0400
Banking Regulation, Common Equity Tier One Risk-Based Capital, Capital Adequacy, Minimum		$ 645,277	$ 662,865
Total capital, Required For Capital Adequacy Purposes		1,147,159	1,178,427
Tier 1 capital, Required For Capital Adequacy Purposes		860,369	883,820
Tier 1 capital, Required For Capital Adequacy Purposes		653,241	690,723
Common equity Tier 1 capital, Required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount		932,066	957,472
Total capital, Required To Be Well Capitalized Under Prompt Corrective Action Provisions		$ 1,433,948	$ 1,473,034
Total capital (to Risk Weighted Assets), Required To Be Well Capitalized Under Prompt Corrective Action Provisions		0.1000	0.1000
Tier 1 capital, Required To Be Well Capitalized Under Prompt Corrective Action Provisions		$ 1,147,159	$ 1,178,427
Tier 1 capital, Required To Be Well Capitalized Under Prompt Corrective Action Provisions		$ 816,551	$ 863,404
Tier I Capital (to Average Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Leverage)		0.0500	0.0500
Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital, Actual Amount		$ 1,568,508	$ 1,623,011
Common equity Tier 1 capital, Actual Ratio		0.1094	0.1101
Total capital (to risk-weighted assets), Amount
Total capital, Actual		$ 1,846,229	$ 1,830,601
Total capital, Minimum Capital Adequacy With Capital Conservation Buffer		1,505,853	1,547,470
Tier I capital (to risk-weighted assets), Amount
Tier 1 capital, Actual		1,668,786	1,724,167
Tier 1 capital, Minimum Capital Adequacy With Capital Conservation Buffer		1,219,024	1,252,714
Tier I capital (to average assets), Amount
Tier 1 capital, Actual		$ 1,668,786	$ 1,724,167
Total capital and Tier I capital (to risk-weighted assets), Ratio
Total capital (to Risk Weighted Assets), Actual		0.1287	0.1242
Total capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes		0.0800	0.0800
Total capital (to Risk Weighted assets), Minimum Capital Adequacy With Capital Conservation Buffer		10.50%	10.50%
Tier 1 capital (to Risk Weighted Assets), Actual		0.1164	0.1170
Tier 1 capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes		0.0600	0.0600
Tier 1 capital (to Risk Weighted Assets), Minimum Capital Adequacy With Capital Conservation Buffer		8.50%	8.50%
Tier I capital (to average assets), Ratio
Tier I Capital (to Average Assets), Actual (Leverage)		0.1022	0.0998
Tier I Capital (to Average Assets), Minimum For Capital Adequacy Purposes (Leverage)		0.0400	0.0400
Banking Regulation, Common Equity Tier One Risk-Based Capital, Capital Adequacy, Minimum		$ 645,366
Total capital, Required For Capital Adequacy Purposes		1,147,317	$ 1,179,025
Tier 1 capital, Required For Capital Adequacy Purposes		860,487	884,269
Tier 1 capital, Required For Capital Adequacy Purposes		653,163	690,864
Bank
Total capital (to risk-weighted assets), Amount
Total capital, Minimum Capital Adequacy With Capital Conservation Buffer		1,505,646	1,546,686
Tier I capital (to risk-weighted assets), Amount
Tier 1 capital, Minimum Capital Adequacy With Capital Conservation Buffer		$ 1,218,856	$ 1,252,079
Total capital and Tier I capital (to risk-weighted assets), Ratio
Total capital (to Risk Weighted assets), Minimum Capital Adequacy With Capital Conservation Buffer		10.50%	10.50%
Tier 1 capital (to Risk Weighted Assets), Minimum Capital Adequacy With Capital Conservation Buffer		8.50%	8.50%
Common Equity Tier 1 | Company
Tier I capital (to risk-weighted assets), Amount
Tier 1 capital, Minimum Capital Adequacy With Capital Conservation Buffer		$ 1,003,902	$ 1,031,647
Total capital and Tier I capital (to risk-weighted assets), Ratio
Tier 1 capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes		0.0450	0.0450
Tier 1 capital (to Risk Weighted Assets), Minimum Capital Adequacy With Capital Conservation Buffer		7.00%	7.00%
Tier I capital (to average assets), Ratio
Tier 1 capital, Required For Capital Adequacy Purposes			$ 663,201
Common Equity Tier 1 | Bank
Tier I capital (to risk-weighted assets), Amount
Tier 1 capital, Minimum Capital Adequacy With Capital Conservation Buffer		$ 1,003,764	$ 1,031,124
Total capital and Tier I capital (to risk-weighted assets), Ratio
Tier 1 capital (to Risk Weighted Assets), Minimum Capital Adequacy With Capital Conservation Buffer		7.00%	7.00%
Common equity tier 1 capital | Bank Subsidiary
Total capital and Tier I capital (to risk-weighted assets), Ratio
Tier 1 capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes		0.0450	0.0450
Tier 1 capital (to Risk Weighted Assets), Required To Be Well Capitalized Under Prompt Corrective Action Provisions		0.0650	0.0650

Revenue Recognition - Service C

Revenue Recognition - Service Charged on Deposit Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Service fees on deposit accounts	$ 1,814	$ 2,736	$ 5,381	$ 9,452
Wire transfer fees	836	892	2,603	2,710
Wire transfer fees
Disaggregation of Revenue [Line Items]
Wire transfer fees	766	812	2,256	2,383
Foreign exchange fees
Disaggregation of Revenue [Line Items]
Wire transfer fees	70	80	347	327
Noninterest Bearing Deposits
Disaggregation of Revenue [Line Items]
Service fees on deposit accounts	1,793	2,714	5,313	9,383
Noninterest Bearing Deposits | Monthly service charges
Disaggregation of Revenue [Line Items]
Service fees on deposit accounts	259	303	808	1,001
Noninterest Bearing Deposits | Customer analysis charges
Disaggregation of Revenue [Line Items]
Service fees on deposit accounts	847	1,693	2,332	5,074
Noninterest Bearing Deposits | NSF charges
Disaggregation of Revenue [Line Items]
Service fees on deposit accounts	606	608	1,921	2,824
Noninterest Bearing Deposits | Other service charges
Disaggregation of Revenue [Line Items]
Service fees on deposit accounts	81	110	252	484
Interest-bearing Deposits | Monthly service charges
Disaggregation of Revenue [Line Items]
Service fees on deposit accounts	$ 21	$ 22	$ 68	$ 69

Revenue Recognition - OREO Inco

Revenue Recognition - OREO Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Net gains on sales of OREO	$ (12)	$ (27)	$ 1	$ (108)

Subsequent Events (Details)

Subsequent Events (Details) - USD ($)	1 Months Ended	9 Months Ended
	Nov. 05, 2021	Sep. 30, 2021	Sep. 30, 2020	Jul. 22, 2021
Subsequent Event [Line Items]
Share repurchase program, authorized amount			$ 50,000,000	$ 50,000,000
Transfer from loans receivable to loans held for sale		$ 374,034,000	$ 1,002,000
Substandard
Subsequent Event [Line Items]
Transfer from loans receivable to loans held for sale		131,200,000
Real estate loans
Subsequent Event [Line Items]
Proceeds from sale of loans		$ 148,900,000
Subsequent Event | Substandard
Subsequent Event [Line Items]
Transfer from loans receivable to loans held for sale	$ 56,600,000
Subsequent Event | Real estate loans | Substandard
Subsequent Event [Line Items]
Proceeds from sale of loans	$ 74,600,000