Hope Bancorp (HOPE) 10-Q 7 May 24 2024 Q1 Quarterly report Financial data

Cover

Cover - shares	3 Months Ended
	Mar. 31, 2024	May 01, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
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)		120,614,770
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001128361
Current Fiscal Year End Date	--12-31

Consolidated Statements Of Fina

Consolidated Statements Of Financial Condition - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Cash and cash equivalents:
Cash and due from banks	$ 160,027	$ 172,813
Interest earning cash in other banks	1,025,269	1,756,154
Total cash and cash equivalents	1,185,296	1,928,967
Investment securities available for sale (“AFS”), at fair value	2,016,389	2,145,059
Amortized Cost	261,601	263,912
Equity investments	43,925	43,750
Loans held for sale, at lower of cost or fair value	2,763	3,408
Loans receivable, net of allowance for credit losses of $158,758 and $158,694 at March 31, 2024 and December 31, 2023, respectively	13,560,420	13,694,925
Other real estate owned (“OREO”), net	0	63
Federal Home Loan Bank (“FHLB”) stock, at cost	17,250	17,250
Premises and equipment, net	50,541	50,611
Accrued interest receivable	60,316	61,720
Deferred tax assets, net	138,350	135,215
Customers’ liabilities on acceptances	780	471
Bank owned life insurance (“BOLI”)	89,484	89,061
Investments in affordable housing partnerships	52,341	54,474
Operating lease right-of-use assets (“ROU”), net	43,849	46,611
Goodwill	464,450	464,450
Core deposit intangible assets, net	3,534	3,935
Servicing assets, net	8,869	9,631
Other assets	88,056	118,009
Total assets	18,088,214	19,131,522
Deposits:
Noninterest bearing	3,652,592	3,914,967
Interest bearing:
Money market and NOW accounts	4,393,971	4,169,543
Savings deposits	919,093	702,486
Time deposits	5,787,761	5,966,757
Total deposits	14,753,417	14,753,753
FHLB and FRB borrowings	795,634	1,795,726
Convertible notes, net	444	444
Subordinated debentures, net	108,148	107,825
Accrued interest payable	122,467	168,174
Acceptances outstanding	780	471
Operating lease liabilities	49,749	52,670
Commitments to fund investments in affordable housing partnerships	20,675	21,017
Other liabilities	124,630	110,199
Total liabilities	15,975,944	17,010,279
STOCKHOLDERS’ EQUITY:
Common stock, $0.001 par value; 150,000,000 authorized shares: issued and outstanding 137,992,864 and 120,610,029 shares, respectively, at March 31, 2024, and issued and outstanding 137,509,621 and 120,126,786 shares, respectively, at December 31, 2023	138	138
Additional paid-in capital	1,439,484	1,439,963
Retained earnings	1,159,593	1,150,547
Treasury stock, at cost; 17,382,835 and 17,382,835 shares at March 31, 2024 and December 31, 2023, respectively	(264,667)	(264,667)
Accumulated other comprehensive loss, net	(222,278)	(204,738)
Total stockholders’ equity	2,112,270	2,121,243
Total liabilities and stockholders’ equity	$ 18,088,214	$ 19,131,522

Consolidated Statements Of Fi_2

Consolidated Statements Of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Fair Value	$ 242,717	$ 250,518
Total	$ 158,758	$ 158,694
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)	137,992,864	137,509,621
Common stock, shares outstanding (in shares)	120,610,029	120,126,786
Treasury stock, at cost, shares repurchased (in shares)	17,382,835	17,382,835

Consolidated Statements Of Inco

Consolidated Statements Of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
INTEREST INCOME:
Interest and fees on loans	$ 213,626	$ 215,935
Interest on investment securities	18,049	15,125
Interest income from cash and deposits at other banks	27,183	4,922
Interest on other investments	816	695
Total interest income	259,674	236,677
INTEREST EXPENSE:
Interest on deposits	124,033	92,348
Interest Expense, FHLB and FRB borrowings	17,853	6,698
Interest on other borrowings and debt	2,741	3,753
Total interest expense	144,627	102,799
NET INTEREST INCOME BEFORE PROVISION FOR CREDIT LOSSES	115,047	133,878
Provision for Loan, Lease, and Other Losses	2,600	3,320
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	112,447	130,558
NONINTEREST INCOME:
Service fees on deposit accounts	2,587	2,221
International service fees	1,035	1,088
Wire transfer fees	812	773
Swap fees	143	42
Net gains on sales of SBA loans	0	2,225
Net gains on sales of residential mortgage loans	73	64
Other income and fees	3,636	4,565
Total noninterest income	8,286	10,978
NONINTEREST EXPENSE:
Salaries and employee benefits	47,836	57,169
Occupancy	6,786	7,521
Furniture and equipment	5,340	5,058
Data processing and communications	2,990	2,822
Professional fees	2,518	1,543
Amortization of investments in affordable housing partnerships	2,134	1,716
FDIC assessments	2,926	1,781
FDIC special assessment	1,000	0
Earned interest credit	5,834	4,427
Restructuring Costs	143	0
Merger-related expenses	1,044	0
Other noninterest expense	6,288	6,697
Total noninterest expense	84,839	88,734
INCOME BEFORE INCOME TAXES	35,894	52,802
INCOME TAX PROVISION	10,030	13,681
NET INCOME	$ 25,864	$ 39,121
EARNINGS PER COMMON SHARE
Basic (in dollars per share)	$ 0.22	$ 0.33
Diluted (in dollars per share)	$ 0.21	$ 0.33

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 25,864	$ 39,121
Other comprehensive (loss) income:
Change in unrealized net holding (losses) gains on securities AFS	(13,734)	31,215
Change in unrealized net holding losses on interest rate contracts used in cash flow hedges	(8,186)	(5,938)
Reclassification adjustments for net gains realized in net income	(2,931)	(1,738)
Tax effect	7,311	(6,939)
Other comprehensive (loss) income, net of tax	(17,540)	16,600
Total comprehensive income	$ 8,324	$ 55,721

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Treasury stock	Accumulated other comprehensive loss, net
Balance at beginning of period (in shares) at Dec. 31, 2022		119,495,209
Balance at beginning of period at Dec. 31, 2022	$ 2,019,328	$ 137	$ 1,431,003	$ 1,083,712	$ (264,667)	$ (230,857)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU 2022-02 | ASU 2022-02	407			407
Adoption of ASU 2022-02 | ASU 2022-02, tax impact	(120)			(120)
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations (in shares)		370,523
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations	0	$ 0
Stock-based compensation	(26)		(26)
Cash dividends declared on common stock	(16,730)			(16,730)
Comprehensive income:
Net income	39,121			39,121
Other comprehensive income (loss)	16,600					16,600
Balance at end of period (in shares) at Mar. 31, 2023		119,865,732
Balance at end of period at Mar. 31, 2023	2,058,580	$ 137	1,430,977	1,106,390	(264,667)	(214,257)
Balance at beginning of period (in shares) at Dec. 31, 2023		120,126,786
Balance at beginning of period at Dec. 31, 2023	2,121,243	$ 138	1,439,963	1,150,547	(264,667)	(204,738)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations (in shares)		483,243
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations	0	$ 0
Stock-based compensation	(479)		(479)
Cash dividends declared on common stock	(16,818)			(16,818)
Comprehensive income:
Net income	25,864			25,864
Other comprehensive income (loss)	(17,540)					(17,540)
Balance at end of period (in shares) at Mar. 31, 2024		120,610,029
Balance at end of period at Mar. 31, 2024	$ 2,112,270	$ 138	$ 1,439,484	$ 1,159,593	$ (264,667)	$ (222,278)

Consolidated Statements Of Ch_2

Consolidated Statements Of Changes In Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Cash dividends declared on common stock (in dollars per share)	$ 0.14	$ 0.14
ASU 2022-02
Adoption of ASU		Accounting Standards Update 2016-13 [Member]
ASU 2022-02, tax impact
Adoption of ASU		ASU 2022-02, tax impact

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 25,864	$ 39,121
Adjustments to reconcile net income to net cash from operating activities:
Discount accretion, net of depreciation and amortization	5,424	3,850
Stock-based compensation expense	2,689	2,351
Provision for credit loss on loans	3,600	1,700
(Credit) provision for unfunded loan commitments	(1,000)	1,620
Net gains on sales of loans	(73)	(2,244)
Net change in fair value of derivatives	4,010	2,763
Amortization of investments in affordable housing partnerships	54	1,640
Net change in deferred income taxes	4,175	4,088
Proceeds from sales of loans held for sale	6,226	12,883
Originations of loans held for sale	(5,508)	(23,385)
Originations of servicing assets	(7)	(965)
Net change in accrued interest receivable	1,404	(2,544)
Net change in other assets	24,690	18,176
Net change in accrued interest payable	(45,707)	27,150
Net change in other liabilities	11,798	(4,534)
Net cash provided by operating activities	29,619	76,144
CASH FLOWS FROM INVESTING ACTIVITIES
Redemption of interest earning deposits in other financial institutions	0	735
Purchase of securities	(37,154)	(2,775)
Proceeds from matured, called, or paid-down securities	151,551	45,038
Purchase of securities	0	(5,545)
Proceeds from matured, called, or paid-down securities	3,327	5,357
Purchase of equity investments	(388)	(247)
Proceeds from sales of other loans held for sale previously classified as held for investment	0	99,180
Net change in loans receivable	132,181	176,163
Proceeds from sales of OREO	63	1,209
Purchase of FHLB stock	0	(4,650)
Redemption of FHLB stock	0	6,030
Purchase of premises and equipment	(2,114)	(2,992)
Purchase of BOLI policy	0	(11,000)
Proceeds from BOLI death benefits	0	587
Investments in affordable housing partnerships	(342)	(2,184)
Net cash provided by investing activities	247,124	304,906
CASH FLOWS FROM FINANCING ACTIVITIES
Net change in deposits	(336)	89,408
Proceeds from FHLB advances	100,000	4,200,000
Repayment of FHLB advances	(100,000)	(4,700,000)
Proceeds from FRB borrowings	110,000	17,132,000
Repayment of FRB borrowings	(1,110,092)	(15,367,000)
Repurchase of convertible notes	0	(10,490)
Cash dividends paid on common stock	(16,818)	(16,730)
Taxes paid in net settlement of restricted stock	(3,168)	(2,377)
Net cash (used in) provided by financing activities	(1,020,414)	1,324,811
NET CHANGE IN CASH AND CASH EQUIVALENTS	(743,671)	1,705,861
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1,928,967	506,776
CASH AND CASH EQUIVALENTS, END OF PERIOD	1,185,296	2,212,637
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest paid	190,011	76,822
Income taxes paid	2,091	1,665
SUPPLEMENTAL DISCLOSURES OF NON-CASH ACTIVITIES
Transfer from loans receivable to loans held for sale	0	162,483
Lease liabilities arising from obtaining ROU assets	$ 712	$ 2,031

Hope Bancorp, Inc.

Hope Bancorp, Inc.	3 Months Ended
	Mar. 31, 2024
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”). At March 31, 2024, the Bank has 48 branches and nine loan production offices in California, New York, Texas, Washington, Illinois, New Jersey, Virginia, Georgia, Alabama, Colorado and Oregon as well 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. On March 28, 2024, the Bank entered into a Purchase and Assumption Agreement with PromiseOne Bank, a Georgia state bank, to sell the deposits, other liabilities and certain physical assets of the Bank’s two branches located in Virginia (Annandale and Centreville). The transaction is expected to be completed in the second half of 2024, subject to regulatory approvals and other customary closing conditions.

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2024
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 at December 31, 2023, which was from the audited financial statements included in the Company’s 2023 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 the Bank. 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 March 31, 2024 and December 31, 2023, and the results of operations for the three months ended March 31, 2024 and 2023. 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. These unaudited consolidated financial statements should be read along with the audited consolidated financial statements and accompanying notes included in the Company’s 2023 Annual Report on Form 10-K. Significant Accounting Policies The Company’s accounting policies are described in Note 1—“Summary of Significant Accounting Policies”, of its audited consolidated financial statements included in its 2023 Annual Report Form 10-K. Significant changes to accounting policies from those disclosed in the Company’s audited consolidated financial statements included in its 2023 Annual Report Form 10-K are presented below. The allowance for unfunded commitments is recognized as a liability (other liabilities in the Consolidated Statements of Financial Condition), with adjustments to the allowance for unfunded commitments recognized through provision for credit losses in the Consolidated Statements of Income. Accounting Pronouncements Adopted In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures” which expands segment disclosure requirements for public entities. ASU 2023-07 requires disclosure of significant segment expenses and other segment items on annual and interim periods about a reportable segment’s profit or loss and assets that are currently required annually. This guidance is effective for public entities for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The Company is currently evaluating the impact of adopting ASU 2023-07. Recently Issued Accounting Pronouncements Not Yet Adopted There were no recently issued accounting pronouncements not yet adopted that are expected to have a material impact on the Company’s consolidated financial statements. SEC Final Rules On March 6, 2024, the SEC adopted final rules that require companies to disclose certain climate-related information such as material climate-related risks; activities to mitigate or adapt to such risks; information about the registrant's board of directors' oversight of climate-related risks and management’s role in managing material climate-related risks; and information on any climate-related targets or goals that are material to the registrant's business, results of operations, or financial condition. In April 2024, the SEC voluntarily stayed the rule pending judicial review. Subject to the results of judicial review, the final rules would be effective for the fiscal year beginning on December 31, 2025. The Company is still assessing the impact of the final rules.
Significant Accounting Policies	Significant Accounting Policies The Company’s accounting policies are described in Note 1—“Summary of Significant Accounting Policies”, of its audited consolidated financial statements included in its 2023 Annual Report Form 10-K. Significant changes to accounting policies from those disclosed in the Company’s audited consolidated financial statements included in its 2023 Annual Report Form 10-K are presented below.

Earnings Per Share ("EPS")

Earnings Per Share ("EPS")	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Earnings Per Share ("EPS")	Earnings Per Share (“EPS”) Earnings per share are computed by dividing net income by the weighted average number of common shares outstanding for the period. 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. 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 March 31, 2024 and 2023, stock options and restricted share awards of 642,245 and 705,659 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, of which $444 thousand remained outstanding at March 31, 2024. 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 Note 10—“Convertible Notes and Subordinated Debentures” for additional information regarding convertible notes issued). Under the required if-converted method for calculating dilutive EPS for convertible instruments, 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 months ended March 31, 2024 and 2023, 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 months ended March 31, 2024 and 2023, as the conversion price exceeded the market price of the Company’s stock. The following table presents computations of basic and diluted EPS for the three months ended March 31, 2024 and 2023. Three Months Ended March 31, 2024 2023 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 $ 25,864 120,187,300 $ 0.22 $ 39,121 119,551,247 $ 0.33 Effect of dilutive securities: Stock options and restricted stock 832,992 691,048 Diluted EPS - common stock $ 25,864 121,020,292 $ 0.21 $ 39,121 120,242,295 $ 0.33

Equity Investments

Equity Investments	3 Months Ended
	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Equity Investments	Equity Investments Equity investments with readily determinable fair values at March 31, 2024 and December 31, 2023, consisted of mutual funds in the amounts of $4.3 million and $4.4 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 months ended March 31, 2024 and 2023, were recorded in other noninterest income and fees as summarized in the table below: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Net change in fair value recorded during the period on equity investments with readily determinable fair value $ (46) $ 69 Less: 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 held at the end of the period $ (46) $ 69 At March 31, 2024 and December 31, 2023, 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 March 31, 2024, the total balance of equity investments without readily determinable fair values included in “Equity investments” on the Consolidated Statements of Financial Condition was $39.6 million, consisting of $370 thousand in correspondent bank stock, $1.0 million in Community Development Financial Institutions (“CDFI”) investments, and $38.2 million in Community Reinvestment Act (“CRA”) investments. At December 31, 2023, the total balance of equity investments without readily determinable fair values was $39.4 million, consisting of $370 thousand in correspondent bank stock, $1.0 million in CDFI investments, and $38.0 million in CRA investments.

Securities Available for Sale

Securities Available for Sale	3 Months Ended
	Mar. 31, 2024
Debt Securities, Available-for-Sale [Abstract]
Securities Available for Sale	Investment Securities The following is a summary of investment securities as of the dates indicated: March 31, 2024 December 31, 2023 Amortized Gross Gross Fair Amortized Gross Gross Fair (Dollars in thousands) Debt securities AFS: U.S. Treasury securities $ 3,999 $ — $ (9) $ 3,990 $ 103,691 $ 21 $ (35) $ 103,677 U.S. Government agency and U.S. Government sponsored enterprises: Agency securities 4,000 — (107) 3,893 4,000 — (100) 3,900 Collateralized mortgage obligations (“CMO”) 876,038 403 (145,248) 731,193 888,631 367 (141,279) 747,719 Mortgage-backed securities (“MBS”): Residential 490,009 — (85,656) 404,353 499,431 — (79,133) 420,298 Commercial 458,834 21 (55,763) 403,092 445,207 113 (53,432) 391,888 Asset-backed securities 139,300 270 (58) 139,512 150,992 — (1,322) 149,670 Corporate securities 23,290 — (3,883) 19,407 23,302 — (3,868) 19,434 Municipal securities 319,402 4,134 (12,587) 310,949 314,554 5,698 (11,779) 308,473 Total investment securities AFS $ 2,314,872 $ 4,828 $ (303,311) $ 2,016,389 $ 2,429,808 $ 6,199 $ (290,948) $ 2,145,059 Debt securities HTM: U.S. Government agency and U.S. Government sponsored enterprises: MBS: Residential $ 148,784 $ — $ (10,646) $ 138,138 $ 150,369 $ — $ (6,663) $ 143,706 Commercial 112,817 — (8,238) 104,579 113,543 — (6,731) 106,812 Total investment securities HTM $ 261,601 $ — $ (18,884) $ 242,717 $ 263,912 $ — $ (13,394) $ 250,518 The Company has elected to exclude accrued interest from the amortized cost of its investment debt securities. Accrued interest receivable for investment debt securities at March 31, 2024 and December 31, 2023, totaled $9.1 million and $11.0 million, respectively. At March 31, 2024 and December 31, 2023, 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. At March 31, 2024 and December 31, 2023, $209.9 million and $200.2 million in unrealized losses on investment securities AFS, net of taxes, respectively, were included in accumulated other comprehensive loss. For the three months ended March 31, 2024 and 2023, there were no reclassifications out of accumulated other comprehensive loss into earnings resulting from the sale of investments securities AFS. The following table presents a breakdown of interest income recorded for investment securities that are taxable and nontaxable. Three Months Ended March 31, 2024 2023 (Dollars in thousands) Interest income on investment securities Taxable $ 16,982 $ 14,046 Nontaxable 1,067 1,079 Total $ 18,049 $ 15,125 The amortized cost and estimated fair value of investment securities at March 31, 2024, by contractual maturity, are presented in the table below. Collateralized mortgage obligations, mortgage-backed securities, and asset-backed securities are presented by final maturity. 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. Available for Sale Held to Maturity Amortized Estimated Amortized Estimated (Dollars in thousands) Debt securities: Due within one year $ 3,999 $ 3,990 $ — $ — Due after one year through five years 155,732 146,039 25,116 24,232 Due after five years through ten years 95,794 85,941 8,679 8,256 Due after ten years 2,059,347 1,780,419 227,806 210,229 Total $ 2,314,872 $ 2,016,389 $ 261,601 $ 242,717 Securities with carrying values of approximately $815.3 million and $1.70 billion at March 31, 2024 and December 31, 2023, 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. The length of time that the individual securities have been in a continuous unrealized loss position is not a factor in determining credit impairment with the adoption of current expected credit losses (“CECL”). March 31, 2024 Less than 12 months 12 months or longer Total Description of Number Fair Gross Number Fair Gross Number Fair Gross (Dollars in thousands) U.S. Treasury securities — $ — $ — 1 $ 3,990 $ (9) 1 $ 3,990 $ (9) U.S. Government agency and U.S. Government sponsored enterprises: Agency securities — — — 1 3,893 (107) 1 3,893 (107) CMOs 1 5,510 (229) 115 700,005 (145,019) 116 705,515 (145,248) MBS: Residential 1 2,591 (164) 64 401,762 (85,492) 65 404,353 (85,656) Commercial 12 77,736 (2,308) 53 323,928 (53,455) 65 401,664 (55,763) Asset-backed securities 2 14,750 — 3 27,492 (58) 5 42,242 (58) Corporate securities — — — 6 19,407 (3,883) 6 19,407 (3,883) Municipal securities 16 63,375 (516) 42 90,383 (12,071) 58 153,758 (12,587) Total 32 $ 163,962 $ (3,217) 285 $ 1,570,860 $ (300,094) 317 $ 1,734,822 $ (303,311) December 31, 2023 Less than 12 months 12 months or longer Total Description of Number Fair Gross Number Fair Gross Number Fair Gross (Dollars in thousands) U.S. Treasury securities — $ — $ — 1 $ 3,963 $ (35) 1 $ 3,963 $ (35) U.S. Government agency and U.S. Government sponsored enterprises: Agency securities — — — 1 3,900 (100) 1 3,900 (100) CMOs 3 19,800 (378) 115 717,662 (140,901) 118 737,462 (141,279) MBS: Residential — — — 65 420,298 (79,133) 65 420,298 (79,133) Commercial 6 53,255 (2,129) 53 331,450 (51,303) 59 384,705 (53,432) Asset-backed securities — — — 18 149,670 (1,322) 18 149,670 (1,322) Corporate securities — — — 6 19,434 (3,868) 6 19,434 (3,868) Municipal securities 11 42,760 (263) 42 91,707 (11,516) 53 134,467 (11,779) Total 20 $ 115,815 $ (2,770) 301 $ 1,738,084 $ (288,178) 321 $ 1,853,899 $ (290,948) The Company had U.S. Treasury securities, agency securities, collateralized mortgage obligations, mortgage-backed, asset-backed, corporate, and municipal securities classified as AFS that were in a continuous loss position for twelve months or longer at March 31, 2024. The collateralized mortgage obligations and mortgage-backed securities were investments in U.S. Government agency and U.S. Government sponsored enterprises and have high credit ratings (“AA” grade or better). The interest on asset-backed, corporate, and municipal securities that were in an unrealized loss position has been paid as agreed, and the Company believes this will continue in the future and that the securities will be paid in full as scheduled. The market value declines for these securities were primarily due to movements in interest rates and are not reflective of management’s expectations of the Company’s ability to fully recover any unrealized losses, which may be at maturity. With the adoption of CECL, the length of time that the fair value of investment securities has been less than amortized cost is not considered when assessing for credit impairment. 79.4% of the Company’s investment portfolio at March 31, 2024, consisted of securities that were issued by U.S. Government agency and U.S. Government sponsored enterprises. Although a government guarantee exists on securities issued by U.S. Government sponsored agencies, these entities are not legally backed by the full faith and credit of the federal government, and the current support is subject to a cap as part of the Housing and Economic Recovery Act of 2008. Nonetheless, at this time the Company does 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, the Company concluded that a zero allowance approach for these investments was appropriate. The Company also had five asset-backed securities, six corporate securities, and 58 municipal bonds in unrealized loss positions at March 31, 2024. The Company performed an assessment of investments in unrealized loss positions for credit impairment and concluded that no allowance for credit losses was required at March 31, 2024. Allowance for Credit Losses on Securities Available for Sale— The Company evaluates investment securities AFS in unrealized loss positions for impairment related to credit losses on at least a quarterly basis. Investment securities AFS in unrealized loss positions are first assessed as to whether the Company intends to sell, or if it is more likely than not that the Company 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 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 quantitative filter for impairment triggers. Once the quantitative filter has been triggered, a security is 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, the Company compares 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 are recognized in other comprehensive income, net of applicable taxes. The Company did not have an allowance for credit losses on investment securities AFS at March 31, 2024 and December 31, 2023. Allowance for Credit Losses on Securities Held to Maturity—

Loans Receivable and Allowance

Loans Receivable and Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2024
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 segment: March 31, 2024 December 31, 2023 (Dollars in thousands) Loan portfolio composition Commercial real estate (“CRE”) loans $ 8,707,673 $ 8,797,884 Commercial and industrial (“C&I”) loans 4,041,063 4,135,044 Residential mortgage loans 936,035 883,687 Consumer and other loans 34,407 37,004 Total loans receivable, net of deferred costs and fees 13,719,178 13,853,619 Allowance for credit losses (158,758) (158,694) Loans receivable, net of allowance for credit losses $ 13,560,420 $ 13,694,925 Loans receivable is stated at the amount of unpaid principal, adjusted for net deferred fees and costs, premiums and discounts, and purchase accounting fair value adjustments. The Company had net deferred fees of $4.9 million and $6.1 million at March 31, 2024 and December 31, 2023, respectively. The loan portfolio consists of four segments: CRE loans, C&I loans, residential mortgage loans, and consumer and other loans. CRE loans are extended for the purchase and refinance of commercial real estate and are generally secured by first deeds of trust and collateralized by residential or commercial properties. C&I loans are loans provided to businesses for various purposes such as working capital, purchasing inventory, debt refinancing, business acquisitions, international trade finance activities, and other business-related financing needs. This segment includes warehouse lines of credit for residential mortgages and Small Business Administration (“SBA”) 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. The Company had loans receivable of $13.72 billion at March 31, 2024, a decrease of $134.4 million, or 1.0%, from December 31, 2023. The decrease in loans receivable during the three months ended March 31, 2024, was due to the decline in C&I and CRE loans, offset partially by the growth in residential mortgage loans. During the three months ended March 31, 2024, loan payoffs and paydowns exceeded new origination volume, reflecting, in part, the Company’s prudent approach to loan growth and lower customer demand in a high interest rate environment. The Company had $2.8 million in loans held for sale at March 31, 2024, compared with $3.4 million at December 31, 2023. Loans held for sale at March 31, 2024, consisted of $2.3 million in CRE loans and $476 thousand in residential mortgage loans. Loans held for sale are not included in the loans receivable table presented above. The tables below detail the activity in the allowance for credit losses (“ACL”) by portfolio segment for the three months ended March 31, 2024 and 2023. CRE Loans C&I Loans Residential Mortgage Loans Consumer and Other Loans Total (Dollars in thousands) Three Months Ended March 31, 2024 Balance, beginning of period $ 93,940 $ 51,291 $ 12,838 $ 625 $ 158,694 Provision (credit) for credit loss on loans (3,614) 8,246 (896) (136) 3,600 Loans charged off (38) (4,619) — (63) (4,720) Recoveries of charge offs 535 547 — 102 1,184 Balance, end of period $ 90,823 $ 55,465 $ 11,942 $ 528 $ 158,758 CRE Loans C&I Loans Residential Mortgage Loans Consumer and Other Loans Total (Dollars in thousands) Three Months Ended March 31, 2023 Balance, beginning of period $ 95,884 $ 56,872 $ 8,920 $ 683 $ 162,359 ASU 2022-02 day 1 adoption adjustment 19 (426) — — $ (407) Provision (credit) for credit loss on loans 12,863 (13,500) 2,333 4 1,700 Loans charged off — (440) — (55) (495) Recoveries of charge offs 69 284 — 34 387 Balance, end of period $ 108,835 $ 42,790 $ 11,253 $ 666 $ 163,544 The following tables break out the allowance for credit losses and loan balance by measurement methodology at March 31, 2024 and December 31, 2023: March 31, 2024 CRE Loans C&I Loans Residential Mortgage Loans Consumer and Other Loans Total (Dollars in thousands) Allowance for credit losses: Individually evaluated $ 1,142 $ 4,466 $ 26 $ 3 $ 5,637 Collectively evaluated 89,681 50,999 11,916 525 153,121 Total $ 90,823 $ 55,465 $ 11,942 $ 528 $ 158,758 Loans outstanding: Individually evaluated $ 84,885 $ 15,071 $ 6,343 $ 276 $ 106,575 Collectively evaluated 8,622,788 4,025,992 929,692 34,131 13,612,603 Total $ 8,707,673 $ 4,041,063 $ 936,035 $ 34,407 $ 13,719,178 December 31, 2023 CRE Loans C&I Loans Residential Mortgage Loans Consumer and Other Loans Total (Dollars in thousands) Allowance for credit losses: Individually evaluated $ 886 $ 1,721 $ 39 $ 14 $ 2,660 Collectively evaluated 93,054 49,570 12,799 611 156,034 Total $ 93,940 $ 51,291 $ 12,838 $ 625 $ 158,694 Loans outstanding: Individually evaluated $ 33,932 $ 5,013 $ 5,916 $ 343 $ 45,204 Collectively evaluated 8,763,952 4,130,031 877,771 36,661 13,808,415 Total $ 8,797,884 $ 4,135,044 $ 883,687 $ 37,004 $ 13,853,619 At March 31, 2024 and December 31, 2023, reserves for unfunded loan commitments recorded in other liabilities were $2.8 million and $3.8 million, respectively. For the three months ended March 31, 2024 and 2023, the Company recorded a reduction to reserves for unfunded commitments of $1.0 million and an addition to reserves for unfunded commitments of $1.6 million, 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 amortized cost of nonaccrual loans, as well as loans past due 90 or more days and still on accrual status, by loan segment and broken out by loans with a recorded ACL and those without a recorded ACL, at March 31, 2024 and December 31, 2023. March 31, 2024 Nonaccrual with No ACL Nonaccrual with an ACL Total Nonaccrual (1) Accruing Loans Past Due 90 Days or More (Dollars in thousands) CRE loans $ 27,273 $ 10,563 $ 37,836 $ 47,049 C&I loans 194 14,876 15,070 185 Residential mortgage loans 2,990 3,354 6,344 — Consumer and other loans — 276 276 56 Total $ 30,457 $ 29,069 $ 59,526 $ 47,290 December 31, 2023 Nonaccrual with No ACL Nonaccrual with an ACL Total Nonaccrual (1) Accruing Loans Past Due 90 Days or More (Dollars in thousands) CRE loans $ 26,724 $ 7,208 $ 33,932 $ — C&I loans 2,447 2,566 5,013 184 Residential mortgage loans 3,002 2,914 5,916 — Consumer and other loans — 343 343 77 Total $ 32,173 $ 13,031 $ 45,204 $ 261 __________________________________ (1) Total nonaccrual loans exclude the guaranteed portion of SBA loans that are in liquidation totaling $10.9 million and $11.4 million, at March 31, 2024 and December 31, 2023, respectively. The following table presents the amortized cost of collateral-dependent loans at March 31, 2024 and December 31, 2023: March 31, 2024 December 31, 2023 Real Estate Collateral Other Collateral Total Real Estate Collateral Other Collateral Total (Dollars in thousands) CRE loans $ 31,795 $ — $ 31,795 $ 29,803 $ — $ 29,803 C&I loans 194 3,694 3,888 2,447 1,708 4,155 Residential mortgage loans 2,990 — 2,990 3,002 — 3,002 Consumer and other loans — — — — — — Total $ 34,979 $ 3,694 $ 38,673 $ 35,252 $ 1,708 $ 36,960 Collateral on loans is a significant portion of what secures collateral-dependent loans and significant changes to the fair value of the collateral can potentially impact ACL. During the three months ended March 31, 2024, the Company did not have any significant changes to the extent to which collateral secured its collateral-dependent loans, due to general deterioration or from other factors. Real estate collateral securing CRE and C&I loans consisted of commercial real estate properties including hotel/motel, building, office, gas station/carwash, warehouse, and residential mortgage properties. Accrued interest receivable on loans totaled $48.7 million at March 31, 2024, and $49.3 million at December 31, 2023. The Company has elected to exclude accrued interest receivable in its estimates of expected credit losses because the Company writes off uncollectible accrued interest receivable in a timely manner. The Company considers writing off accrued interest amounts once the amounts become 90 days past due to be considered within a timely manner. The Company has elected to write off accrued interest receivable by reversing interest income. The following table presents interest income reversals, due to loans being placed on nonaccrual status, by loan segment for the three months ended March 31, 2024 and 2023: Three Months Ended March 31, 2024 2023 (Dollars in thousands) CRE loans $ 191 $ 451 C&I loans 588 518 Residential mortgage loans 6 14 Total $ 785 $ 983 The following table presents the amortized cost of past due loans, including nonaccrual loans past due 30 or more days, by the number of days past due at March 31, 2024 and December 31, 2023, by loan segment: March 31, 2024 December 31, 2023 30-59 Days 60-89 Days 90 Days or More Total 30-59 Days 60-89 Days 90 Days or More Total (Dollars in thousands) CRE loans $ 2,814 $ 1,764 $ 61,642 $ 66,220 $ 1,999 $ 2,976 $ 10,197 $ 15,172 C&I loans 483 349 626 1,458 934 533 1,717 3,184 Residential mortgage loans — 540 1,946 2,486 1,534 — 2,339 3,873 Consumer and other loans 332 74 56 462 214 48 77 339 Total Past Due $ 3,629 $ 2,727 $ 64,270 $ 70,626 $ 4,681 $ 3,557 $ 14,330 $ 22,568 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. The following table presents the amortized cost basis of loans receivable by segment, risk rating, and year of origination, renewal, or major modification at March 31, 2024 and December 31, 2023. March 31, 2024 Term Loan by Year Revolving Loans Total 2024 2023 2022 2021 2020 Prior (Dollars in thousands) CRE loans Pass $ 171,109 $ 598,990 $ 2,398,974 $ 1,998,868 $ 1,188,980 $ 2,115,568 $ 76,726 $ 8,549,215 Special mention — 14,991 — 18,984 3,319 13,774 — 51,068 Substandard — — 940 26,099 32,521 47,830 — 107,390 Subtotal $ 171,109 $ 613,981 $ 2,399,914 $ 2,043,951 $ 1,224,820 $ 2,177,172 $ 76,726 $ 8,707,673 Year-to-date gross charge offs $ — $ — $ — $ — $ — $ 38 $ — $ 38 C&I loans Pass $ 454,730 $ 813,203 $ 1,087,252 $ 601,332 $ 187,564 $ 156,808 $ 483,974 $ 3,784,863 Special mention 8,760 23,833 30,931 28,699 — 14,594 57,298 164,115 Substandard 10,140 7,479 55,470 8,324 8,484 1,596 592 92,085 Subtotal $ 473,630 $ 844,515 $ 1,173,653 $ 638,355 $ 196,048 $ 172,998 $ 541,864 $ 4,041,063 Year-to-date gross charge offs $ — $ — $ 4,569 $ 29 $ — $ 21 $ — $ 4,619 Residential mortgage loans Pass $ 69,478 $ 92,651 $ 360,664 $ 259,765 $ 1,347 $ 145,531 $ — $ 929,436 Special mention — — — — — — — — Substandard — — — 853 1,836 3,910 — 6,599 Subtotal $ 69,478 $ 92,651 $ 360,664 $ 260,618 $ 3,183 $ 149,441 $ — $ 936,035 Year-to-date gross charge offs $ — $ — $ — $ — $ — $ — $ — $ — Consumer and other loans Pass $ 3,782 $ 741 $ 539 $ 249 $ 1,788 $ 8,768 $ 18,264 $ 34,131 Special mention — — — — — — — — Substandard — — — — — 276 — 276 Subtotal $ 3,782 $ 741 $ 539 $ 249 $ 1,788 $ 9,044 $ 18,264 $ 34,407 Year-to-date gross charge offs $ — $ — $ — $ — $ — $ — $ 63 $ 63 Total loans Pass $ 699,099 $ 1,505,585 $ 3,847,429 $ 2,860,214 $ 1,379,679 $ 2,426,675 $ 578,964 $ 13,297,645 Special mention 8,760 38,824 30,931 47,683 3,319 28,368 57,298 215,183 Substandard 10,140 7,479 56,410 35,276 42,841 53,612 592 206,350 Total $ 717,999 $ 1,551,888 $ 3,934,770 $ 2,943,173 $ 1,425,839 $ 2,508,655 $ 636,854 $ 13,719,178 Total year-to-date gross charge offs $ — $ — $ 4,569 $ 29 $ — $ 59 $ 63 $ 4,720 December 31, 2023 Term Loan by Year Revolving Loans Total 2023 2022 2021 2020 2019 Prior (Dollars in thousands) CRE loans Pass $ 623,058 $ 2,429,146 $ 2,045,863 $ 1,239,654 $ 996,483 $ 1,297,295 $ 79,426 $ 8,710,925 Special mention — 2,001 15,452 2,518 5,963 5,196 — 31,130 Substandard — 1,549 7,300 2,711 2,083 42,186 — 55,829 Subtotal $ 623,058 $ 2,432,696 $ 2,068,615 $ 1,244,883 $ 1,004,529 $ 1,344,677 $ 79,426 $ 8,797,884 Year-to-date gross charge offs $ 103 $ 315 $ — $ 233 $ 355 $ 1,941 $ — $ 2,947 C&I loans Pass $ 1,107,219 $ 1,208,795 $ 683,821 $ 203,142 $ 162,815 $ 61,019 $ 479,266 $ 3,906,077 Special mention 9,743 23,413 31,388 8,597 14,614 — 60,107 147,862 Substandard 7,158 53,213 8,480 8,637 290 2,358 969 81,105 Subtotal $ 1,124,120 $ 1,285,421 $ 723,689 $ 220,376 $ 177,719 $ 63,377 $ 540,342 $ 4,135,044 Year-to-date gross charge offs $ 5,011 $ 12,323 $ 16,020 $ 128 $ 182 $ 539 $ — $ 34,203 Residential mortgage loans Pass $ 93,982 $ 365,252 $ 263,977 $ 1,356 $ 29,063 $ 123,885 $ — $ 877,515 Special mention — — — — — — — — Substandard — — 314 1,836 957 3,065 — 6,172 Subtotal $ 93,982 $ 365,252 $ 264,291 $ 3,192 $ 30,020 $ 126,950 $ — $ 883,687 Year-to-date gross charge offs $ — $ — $ — $ — $ — $ — $ — $ — Consumer and other loans Pass $ 3,985 $ 944 $ 278 $ 2,068 $ 371 $ 8,221 $ 20,794 $ 36,661 Special mention — — — — — — — — Substandard — — — — — 343 — 343 Subtotal $ 3,985 $ 944 $ 278 $ 2,068 $ 371 $ 8,564 $ 20,794 $ 37,004 Year-to-date gross charge offs $ — $ — $ — $ — $ — $ — $ 370 $ 370 Total loans Pass $ 1,828,244 $ 4,004,137 $ 2,993,939 $ 1,446,220 $ 1,188,732 $ 1,490,420 $ 579,486 $ 13,531,178 Special mention 9,743 25,414 46,840 11,115 20,577 5,196 60,107 178,992 Substandard 7,158 54,762 16,094 13,184 3,330 47,952 969 143,449 Total $ 1,845,145 $ 4,084,313 $ 3,056,873 $ 1,470,519 $ 1,212,639 $ 1,543,568 $ 640,562 $ 13,853,619 Total year-to-date gross charge offs $ 5,114 $ 12,638 $ 16,020 $ 361 $ 537 $ 2,480 $ 370 $ 37,520 For the three months ended March 31, 2024 and the twelve months ended December 31, 2023, 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 segment that were reclassified from held for investment to held for sale for the three months ended March 31, 2024 and 2023, is presented in the following table: Three Months Ended March 31, 2024 2023 Transfer of loans held for investment to held for sale (Dollars in thousands) CRE loans $ — $ 53,608 C&I loans — 108,875 Total $ — $ 162,483 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 differentiates its loan segments based on shared risk characteristics for which allowance for credit losses is measured on a collective basis. Risk Characteristics CRE loans Property type, location, owner-occupied status C&I loans Delinquency status, risk rating, industry type Residential mortgage loans FICO score, LTV, delinquency status, maturity date, collateral value, location Consumer and other loans Historical losses 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 the calculation of the allowance for credit losses for collectively assessed loans. The Company uses a reasonable and supportable period of two years, at which point loss assumptions revert back to historical loss information by means of one-year reversion period. Included in the quantitative portion of the ACL analysis are inputs such as borrowers’ net operating income, debt coverage ratios, real estate collateral values, as well as factors that are more subjective or require management’s judgment, including key macroeconomic variables from Moody’s forecast scenarios such as GDP, unemployment rates, interest rates, and CRE prices. These key inputs are utilized in the Company’s models to develop PD and LGD assumptions used in the calculation of estimated quantitative losses. The ACL for the Company’s construction, credit card, and certain consumer loans is calculated based on a non-modeled approach that utilizes 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 the aggregate, non-modeled loans represented less than 2% of the Company’s total loan portfolio at March 31, 2024. 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. At March 31, 2024, the Company utilized the March 2024 consensus economic forecast scenario from Moody’s, as it best aligned with management’s expectations of future conditions. The forecast projected GDP growth of 1.4% in 2024, 2.0% for 2025, and 1.9% for 2026, with unemployment projected to be 4.1% for 2024, 4.1% for 2025, and 3.9% in 2026. CRE prices in the consensus scenario were expected to decrease initially, with the CRE price index declining -6.7% for 2024, before rebounding +6.0% for 2025 and +8.0% in 2026. The Company also utilized Moody’s December 2023 consensus economic forecast for the calculation of the December 31, 2023 ACL. In order to 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 Interagency Policy Statement on the Allowance for Credit 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, and other loan modifications; • Changes in the quality of the loan review system and the degree of oversight by the management and the Board of 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 that do not share similar risk characteristics such as nonaccrual loans above $1.0 million, the Company evaluates these loans on an individual basis in accordance with ASC 326. Such nonaccrual loans are considered to have different risk profiles than performing loans and are therefore evaluated individually. The Company elected to collectively assess nonaccrual loans with balances below $1.0 million along with the performing and accrual loans, in order to reduce the operational burden of individually assessing small 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 loss on loans. The Company maintains a separate ACL for its off-balance-sheet unfunded loan commitments. The Company uses an estimated funding rate to allocate an 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 look-back period of eight quarters. Credit loss is not estimated for off-balance-sheet credit exposures that are unconditionally cancellable by the Company. Loan Modifications to Borrowers Experiencing Financial Difficulty In January 2023, the Company adopted ASU 2022-02, Financial Instruments - Credit Losses (Topic 326): TDR and Vintage Disclosures (“ASU 2022-02”), which eliminated the accounting guidance for TDR while enhancing disclosure requirements for certain loan refinancing and restructurings by creditors when a borrower is experiencing financial difficulty. The Company applied this guidance on a modified retrospective transition method, which resulted in a positive cumulative effect adjustment to retained earnings of $287 thousand, net of tax. Subsequent to the adoption of ASU 2022-02, the new guidance is applied uniformly to the Company’s entire loan portfolio when estimating expected credit losses. A summary of loans modified to borrowers experiencing financial difficulty for the period presented, disaggregated by loan class and type of modification, is shown in the tables below. Three Months Ended March 31, 2024 CRE Loans C&I Loans Residential Mortgage Loans Consumer and Other Loans Total (Dollars in thousands) Principal forgiveness $ — $ 10,140 $ — $ — $ 10,140 Interest rate reduction — — — — — Payment delay — — — — — Term extension — — — — — Total Loan Modifications $ — $ 10,140 $ — $ — $ 10,140 % of Loan Class — % 0.25 % — % — % 0.07 % There were no loans modified to borrowers experiencing financial difficulty during the three months ended March 31, 2023. The following table describes the financial effect of the loan modifications made to borrowers experiencing financial difficulty for the periods presented: Three Months Ended March 31, 2024 Modification & Loan Types Financial Effect Principal forgiveness: C&I loans Forgiveness of principal totaling $4.4 million The Company closely monitors the performance of the loans that are modified to borrowers experiencing financial difficulty to understand the effectiveness of its modification efforts. All loans that have been modified within the previous 12 months to borrowers experiencing financial difficulty were current at March 31, 2024 and 2023. There were no loan modifications to borrowers experiencing financial difficulty that had payment defaults during the three months ended March 31, 2024 and 2023, and were modified in the 12 months prior to default.

Leases

Leases	3 Months Ended
	Mar. 31, 2024
Leases [Abstract]
Leases	Leases The Company’s operating leases are real estate leases of bank branch locations, loan production offices, and office spaces with remaining lease terms ranging from 1 to 9 years at March 31, 2024. 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. The table below summarizes supplemental balance sheet information related to operating leases: March 31, 2024 December 31, 2023 (Dollars in thousands) Operating lease ROU assets $ 43,849 $ 46,611 Current portion of long-term lease liabilities 14,128 14,287 Long-term lease liabilities 35,621 38,383 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. During the three months ended March 31, 2024, the Company extended two leases and did not enter into any new lease contracts. Lease extension terms ranged from three The Company wrote off $93 thousand in operating ROU assets resulting from the branch consolidation of one location during the three months ended March 31, 2023. There was no impairment on operating ROU assets during the same period of 2024. The table below summarizes the Company’s net operating lease cost: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Operating lease cost $ 3,606 $ 3,841 Variable lease cost 808 783 Sublease income (39) (42) Net lease cost $ 4,375 $ 4,582 Rent expense for the three months ended March 31, 2024 and 2023, was $4.2 million and $4.8 million, respectively. The table below summarizes other information related to the Company’s operating leases: At or for the Three Months Ended 2024 2023 (Dollars in thousands) Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows for operating leases $ 3,981 $ 3,961 ROU assets obtained in exchange for lease liabilities, net 712 2,031 Weighted-average remaining lease term - operating leases 3.9 years 4.5 years Weighted-average discount rate - operating leases 2.84 % 2.52 % The table below summarizes the maturity of remaining lease liabilities: March 31, 2024 (Dollars in thousands) 2024 $ 11,620 2025 14,144 2026 13,451 2027 7,932 2028 3,043 2029 and thereafter 2,575 Total lease payments 52,765 Less: imputed interest 3,016 Total lease obligations $ 49,749 At March 31, 2024, the Company had no operating lease commitments that had not yet commenced. The Company did not have any finance leases at March 31, 2024 and December 31, 2023.

Deposits

Deposits	3 Months Ended
	Mar. 31, 2024
Deposits [Abstract]
Deposits	Deposits Total deposits of $14.75 billion at March 31, 2024, were largely unchanged from $14.75 billion at December 31, 2023. The aggregate amount of time deposits in denominations of more than $250 thousand at March 31, 2024 and December 31, 2023, was $2.29 billion and $2.24 billion, respectively. Included in time deposits of more than $250 thousand was $300.0 million in California State Treasurer’s deposits at March 31, 2024 and December 31, 2023. 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 March 31, 2024 and December 31, 2023, securities with fair values of approximately $211.6 million and $218.7 million, respectively, and a $150.0 million letter of credit issued by the FHLB, were pledged as collateral for the California State Treasurer’s deposits. Brokered deposits at March 31, 2024 and December 31, 2023, totaled $1.42 billion and $1.54 billion, respectively. Brokered deposits at March 31, 2024, consisted of $227.8 million in money market and NOW accounts and $1.19 billion in time deposit accounts. Brokered deposits at December 31, 2023, consisted of $164.1 million in money market and NOW accounts and $1.37 billion in time deposit accounts. The aggregate amount of unplanned overdrafts of demand deposits that were reclassified as loans was $1.4 million and $2.0 million at March 31, 2024 and December 31, 2023, respectively. The following is a breakdown of the Company’s deposits at March 31, 2024 and December 31, 2023: March 31, 2024 December 31, 2023 Balance Percentage (%) Balance Percentage (%) (Dollars in thousands) Noninterest bearing demand deposits $ 3,652,592 25 % $ 3,914,967 27 % Money market and NOW accounts 4,393,971 30 % 4,169,543 28 % Savings deposits 919,093 6 % 702,486 5 % Time deposits 5,787,761 39 % 5,966,757 40 % Total deposits $ 14,753,417 100 % $ 14,753,753 100 %

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Borrowings	Borrowings At March 31, 2024, borrowings totaled $795.6 million, compared with $1.80 billion at December 31, 2023. All of the Company’s borrowings at March 31, 2024 and December 31, 2023, had maturities of less than 12 months. The tables below summarize the Company’s borrowing lines at March 31, 2024 and December 31, 2023: March 31, 2024 Total Borrowings Outstanding Available Borrowing Capacity Amount Weighted Average Rate (Dollars in thousands) FHLB $ 4,209,620 $ 100,000 5.59 % $ 4,109,620 FRB Discount Window 653,520 — — % 653,520 FRB Bank Term Funding Program (“BTFP”) 695,634 695,634 4.61 % — Unsecured Federal Funds lines 311,815 — — % 311,815 Total $ 5,870,589 $ 795,634 4.73 % $ 5,074,955 December 31, 2023 Total Borrowings Outstanding Available Borrowing Capacity Amount Weighted Average Rate (Dollars in thousands) FHLB $ 4,167,168 $ 100,000 5.73 % $ 4,067,168 FRB Discount Window 630,369 — — % 630,369 BTFP 1,707,909 1,695,726 4.47 % 12,183 Unsecured Federal Funds lines 312,315 — — % 312,315 Total $ 6,817,761 $ 1,795,726 4.54 % $ 5,022,035 The Company maintains a line of credit with the FHLB of San Francisco as a secondary source of funds. The borrowing capacity with the FHLB is limited to the lower of either 25% of the Bank’s total assets or the Bank’s collateral capacity. The terms of this credit facility require the Company to pledge eligible collateral with the FHLB equal to at least 100% of outstanding advances. At March 31, 2024 and December 31, 2023, loans with a carrying amount of $7.57 billion and $7.60 billion were pledged at the FHLB for outstanding advances and remaining borrowing capacity, respectively. At March 31, 2024 and December 31, 2023, 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 total asset size and outstanding borrowings. As a member of the FRB system, the Bank may also borrow from the FRB discount window. 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 March 31, 2024, the outstanding principal balance of the qualifying loans pledged at the FRB discount window was $757.1 million. There were no investment securities pledged at the discount window at March 31, 2024. The Company availed itself of the BTFP, which was created in March 2023 to enhance banking system liquidity by allowing institutions to pledge certain securities at par value and borrow at a rate of ten basis points over the one-year overnight index swap rate. The BTFP is available to federally insured depository institutions in the U.S., with advances having a term of up to one year with no prepayment penalties. In 2023, the BTFP was available to federally insured depository institutions in the U.S. at a fixed rate of ten basis points over the one-year overnight index swap rate, but in 2024, the interest rate is no lower than the interest rate on reserve balances in effect on the day the loan is made. The Company’s outstanding borrowings at March 31, 2024 and December 31, 2023, were not subject to the new rate. The BTFP ceased extending new advances in March 2024. At March 31, 2024, the Company had a total par value of $718.7 million in investment securities that were pledged under the BTFP. The Company also maintains unsecured federal funds borrowing lines with other banks. There were no borrowings outstanding from other banks at March 31, 2024 and December 31, 2023.

Subordinated Debentures and Con

Subordinated Debentures and Convertible Notes	3 Months Ended
	Mar. 31, 2024
Subordinated Borrowings [Abstract]
Subordinated Debentures and Convertible Notes	Convertible Notes and Subordinated Debentures 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 are not capital instruments but 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 represented 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. 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 have the option to put the notes back to the Company on 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. On May 15, 2023, most holders of the Company’s convertible notes elected to exercise their optional put right and the Company paid off $197.1 million principal amount of notes in cash. During 2023, the Company also repurchased its notes in the aggregate principal amount of $19.9 million and recorded a gain on debt extinguishment of $405 thousand. The repurchased notes were immediately cancelled subsequent to the repurchase. These repurchases are separate from the optional put and were made through a third-party broker. No notes were repurchased or paid off in the three months ended March 31, 2024. The carrying value of the convertible notes at March 31, 2024 and December 31, 2023, was $444 thousand. The capitalized issuance costs were fully amortized at both March 31, 2024 and December 31, 2023. Interest expense on the convertible notes for the three months ended March 31, 2024 and 2023, totaled $2 thousand and $1.3 million, respectively.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments As part of the Company’s overall interest rate risk management, the Company enters into derivative instruments, including interest rate swaps, collars, caps, floors, foreign exchange contracts, risk participation agreements and mortgage banking derivatives. The notional amount does not represent amounts exchanged by the parties. The amount exchanged is determined by reference to the notional amount and the other terms of the individual agreements. Derivative instruments are recognized on the balance sheet at their fair value and are not reported on a net basis. The tables below present the fair value of the Company’s derivative financial instruments at March 31, 2024 and December 31, 2023. The Company’s derivative assets and derivative liabilities are located within “Other assets” and “Other liabilities,” respectively, on the Company’s Consolidated Statements of Financial Condition. March 31, 2024 Notional Fair Value (1) Other Assets Other Liabilities (Dollars in thousands) Derivatives designated as cash flow hedges Interest rate swaps $ 725,000 $ — $ — Interest rate collars 500,000 — 3,860 Forward interest rate swaps 1,000,000 281 7,430 Total $ 2,225,000 $ 281 $ 11,290 Derivatives not designated as hedges Interest rate contracts with correspondent banks $ 1,092,318 $ 62,141 $ 210 Interest rate contracts with customers 1,092,318 210 63,693 Foreign exchange contracts with correspondent banks 7,932 111 7 Foreign exchange contracts with customers 620 17 — Risk participation agreement 149,707 — 13 Mortgage banking derivatives 2,500 7 6 Total $ 2,345,395 $ 62,486 $ 63,929 __________________________________ (1) The fair values of centrally-cleared derivative contracts are presented net of settled-to-market margin. December 31, 2023 Notional Fair Value (1) Other Assets Other Liabilities (Dollars in thousands) Derivatives designated as cash flow hedges Interest rate swaps $ 725,000 $ — $ — Interest rate collars 250,000 — 1,149 Forward interest rate swaps 1,000,000 10,812 — Forward interest rate collars 250,000 148 — Total $ 2,225,000 $ 10,960 $ 1,149 Derivatives not designated as hedges Interest rate contracts with correspondent banks $ 1,096,292 $ 53,185 $ 1,117 Interest rate contracts with customers 1,096,292 1,117 54,505 Foreign exchange contracts with correspondent banks 10,739 4 202 Foreign exchange contracts with customers 1,744 57 — Risk participation agreement 130,365 — 28 Mortgage banking derivatives 1,377 7 17 Total $ 2,336,809 $ 54,370 $ 55,869 __________________________________ (1) The fair values of centrally-cleared derivative contracts are presented net of settled-to-market margin. Derivatives designated as cash flow hedges The Company’s interest rate contracts designated as cash flow hedges were determined to be fully effective during the periods presented and were hedged to financial instruments tied to term SOFR and Federal Funds Rate. The aggregate fair value of the cash flow hedges are recorded in assets or liabilities on the Consolidated Statements of Financial Condition, with changes in fair value recorded in other comprehensive income on the Consolidated Statements of Comprehensive Income. The gain or loss on derivatives is recorded in accumulated other comprehensive income (“AOCI”) and is subsequently reclassified into interest income and interest expense in the period, during which the hedged forecasted transaction affects earnings. Amounts reported in AOCI related to interest rate agreements 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 hedges to remain fully effective throughout the remaining terms. The Company expects to reclassify, during the next 12 months, approximately $5.2 million, net of taxes, from AOCI as an increase to net interest income. The table below presents the gains (losses) on derivative instruments designated as cash flow hedges, that were reclassified from AOCI into earnings for the periods indicated: Derivative Instruments Designated as Cash Flow Hedges Location of Gain (Loss) Three Months Ended March 31, 2024 2023 (Dollars in thousands) Interest rate contracts Interest income and fees on loans $ (1,000) $ — Interest rate contracts Interest expense on deposits 3,483 1,719 Interest rate contracts Interest expense on FHLB and FRB borrowings 1,295 1,053 Total $ 3,778 $ 2,772 Total cash held as collateral for interest rate contracts designated as cash flow hedges was $0 at March 31, 2024, and $22.9 million at December 31, 2023. Derivatives not designated as hedges The Company’s derivatives not designated as hedges are not speculative and result from a service the Company provides to certain customers. 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. Simultaneously, 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 interest rate contracts are not designated as hedging instruments and are recorded at fair value in other assets and other liabilities. The change in fair value is recognized in the Consolidated Statements of Income as other income and fees. The Company offers foreign exchange contracts to customers to purchase and/or sell foreign currencies at set rates in the future. The foreign exchange contracts allow customers to hedge the foreign exchange rate risk of their deposits and loans denominated in foreign currencies. In conjunction with this, the Company also enters into offsetting back-to-back contracts with institutional counterparties to hedge the Company’s foreign exchange rate risk. The Company also enters into certain foreign exchange contracts with institutional counterparties, including non-deliverable forward contracts, to manage its foreign exchange rate risk. These foreign exchange contracts are not designated as hedging instruments and are recorded at fair value in other assets and other liabilities. During the three months ended March 31, 2024 and 2023, the changes in fair value on foreign exchange contracts were gains of $263 thousand and $6 thousand, respectively, and were recognized in the Consolidated Statements of Income as other income and fees. At March 31, 2024, the Company had risk participation agreements with an outside counterparty for interest rate swaps related to loans in which it is a participant. The risk participation agreements provide credit protection to the financial institution should the borrowers fail to perform on their interest rate derivative contracts. 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 of credit derivatives are recognized directly in earnings. The fee received, less the estimate of the loss for credit exposure, is recognized in earnings at the time of the transaction. 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 March 31, 2024, the Company had approximately $2.5 million in interest rate lock commitments and total forward sales commitments for the future delivery of residential mortgage loans. At December 31, 2023, the Company had approximately $1.4 million in interest rate lock commitments and total forward sales commitments for the future delivery of residential mortgage loans.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The following table presents a summary of commitments described below at the dates indicated below: March 31, 2024 December 31, 2023 (Dollars in thousands) Commitments to extend credit $ 2,105,176 $ 2,274,239 Standby letters of credit 132,811 132,132 Other letters of credit 30,645 51,983 Commitments to fund investments in affordable housing partnerships 20,675 21,017 The Company is a party to financial instruments with off-balance-sheet risk in the normal course of business to meet the financing needs of its 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. The estimated exposure to loss from these commitments is included in the reserve for unfunded loan commitments, which amounted to $2.8 million at March 31, 2024, and $3.8 million at December 31, 2023. 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 $450 thousand at March 31, 2024, and $535 thousand at December 31, 2023. 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. Management believes that none of these legal claims, individually or in the aggregate, will have a material adverse effect on the results of operations or financial condition of the Company.

Goodwill, Intangible Assets, an

Goodwill, Intangible Assets, and Servicing Assets	3 Months Ended
	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Intangible Assets, and Servicing Assets	Goodwill, Intangible Assets, and Servicing Assets Goodwill The carrying amount of the Company’s goodwill at March 31, 2024, and December 31, 2023, was $464.5 million. There was no impairment of goodwill recorded during the three months ended March 31, 2024. Goodwill and other intangible assets generated from business combinations and deemed to have indefinite lives are not subject to amortization and instead are tested for impairment annually at the reporting unit level unless a triggering event occurs thereby requiring an updated assessment. 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. Impairment exists when the carrying value of the goodwill exceeds the fair value of the reporting unit. At December 31, 2023, the Company performed a qualitative assessment to test for impairment and management has concluded that there was no impairment. As the Company operates as single business unit, goodwill impairment was assessed based on the Company as a whole. Intangible Assets Amortization expense related to core deposit intangible assets totaled $401 thousand and $448 thousand for the three months ended March 31, 2024 and 2023, respectively. The following table provides information regarding the core deposit intangibles at March 31, 2024 and December 31, 2023: March 31, 2024 December 31, 2023 Core Deposit Intangibles Related To: Amortization Period Gross Accumulated Carrying Amount Accumulated Carrying Amount (Dollars in thousands) Foster Bankshares acquisition 10 years $ 2,763 $ (2,763) $ — $ (2,763) $ — Wilshire Bancorp acquisition 10 years 18,138 (14,604) 3,534 (14,203) 3,935 Total $ 20,901 $ (17,367) $ 3,534 $ (16,966) $ 3,935 Servicing Assets Total servicing assets at March 31, 2024, totaled $8.9 million and were comprised of $7.0 million in SBA servicing assets and $1.9 million in mortgage related servicing assets. At December 31, 2023, servicing assets totaled $9.6 million and were comprised of $7.6 million in SBA servicing assets and $2.1 million in mortgage related servicing assets. 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. At March 31, 2024 and December 31, 2023, the Company did not have a valuation allowance on its servicing assets. The changes in servicing assets for the three months ended March 31, 2024 and 2023, were as follows: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Balance at beginning of period $ 9,631 $ 11,628 Additions through originations of servicing assets 7 965 Amortization (769) (965) Balance at end of period $ 8,869 $ 11,628 Loans serviced for others are not reported as assets. The principal balances of loans serviced for other institutions were $953.5 million at March 31, 2024, and $987.4 million at December 31, 2023. 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 March 31, 2024 and December 31, 2023, are presented below. March 31, 2024 December 31, 2023 SBA Servicing Assets: Weighted-average discount rate 9.82% 11.12% Constant prepayment rate 12.22% 12.17% Mortgage Servicing Assets: Weighted-average discount rate 11.13% 11.00% Constant prepayment rate 4.99% 9.52%

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three months ended March 31, 2024, the Company recorded an income tax provision totaling $10.0 million on pretax income of $35.9 million, representing an effective tax rate of 27.94%, compared with an income tax provision of $13.7 million on pretax income of $52.8 million, representing an effective tax rate of 25.91% for the three months ended March 31, 2023. 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 $807 thousand at March 31, 2024, and $469 thousand at December 31, 2023, that relate to uncertainties associated with federal and state income tax matters. Management believes it is reasonably possible that the unrecognized tax benefits may decrease by $269 thousand in the next twelve months due to the expiration of statute of limitations. 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	3 Months Ended
	Mar. 31, 2024
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: Investment Securities The fair values of investment securities available for sale and held to maturity 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 value of the Company’s Level 3 security available for sale was 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 Contracts The Company offers interest rate contracts 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 contract with the customer. The Company also enters into an offsetting interest rate contract 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. The fair value assets and liabilities of centrally cleared interest rate contracts are net of variation margin settled-to-market. Due to the observable nature of the inputs used in deriving the fair value of these derivative contracts, the valuation of interest rate contracts 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 contracts designated as cash flow hedges, foreign exchange contracts 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, foreign exchange rates and, when appropriate, the current credit worthiness of the counterparties. Fair value assets and liabilities of centrally cleared derivatives are net of variation margin settled-to-market. Interest rate contracts designated as cash flow hedges and foreign exchange contracts, which includes non-deliverable forward contracts, are classified within Level 2 due to the observable nature of the inputs used in deriving the fair value of these contracts. 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 C&I 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. If Level 2 inputs are not available, carrying values 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 March 31, 2024 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Investment securities AFS: U.S. Treasury securities $ 3,990 $ 3,990 $ — $ — U.S. Government agency and U.S. Government sponsored enterprises: Agency securities 3,893 — 3,893 — Collateralized mortgage obligations 731,193 — 731,193 — Mortgage-backed securities: Residential 404,353 — 404,353 — Commercial 403,092 — 403,092 — Asset-backed securities 139,512 — 139,512 — Corporate securities 19,407 — 19,407 — Municipal securities 310,949 — 310,130 819 Equity investments with readily determinable fair value 4,317 4,317 — — Interest rate contracts 62,351 — 62,351 — Mortgage banking derivatives 7 — 7 — Other derivatives 409 — 409 — Liabilities: Interest rate contracts 63,903 — 63,903 — Mortgage banking derivatives 6 — 6 — Other derivatives 11,310 — 11,297 13 Fair Value Measurements at the End of December 31, 2023 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Investment securities AFS: U.S. Treasury securities $ 103,677 $ 103,677 $ — $ — U.S. Government agency and U.S. Government sponsored enterprises: Agency securities 3,900 — 3,900 — Collateralized mortgage obligations 747,719 — 747,719 — Mortgage-backed securities: Residential 420,298 — 420,298 — Commercial 391,888 — 391,888 — Asset-backed securities 149,670 — 149,670 — Corporate securities 19,434 — 19,434 — Municipal securities 308,473 — 307,615 858 Equity investments with readily determinable fair value 4,363 4,363 — — Interest rate contracts 54,302 — 54,302 — Mortgage banking derivatives 7 — 7 — Other derivatives 11,021 — 11,021 — Liabilities: Interest rate contracts 55,622 — 55,622 — Mortgage banking derivatives 17 — 17 — Other derivatives 1,379 — 1,351 28 There were no transfers between Levels 1, 2, and 3 during the three months ended March 31, 2024 and 2023. The table below presents a reconciliation and income statement classification of gains (losses) for the municipal security and risk participation agreements measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended March 31, 2024 and 2023: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Municipal securities: Beginning Balance $ 858 $ 943 Change in fair value included in other comprehensive income (39) 39 Ending Balance $ 819 $ 982 Risk participation agreements: Beginning Balance $ 28 $ 32 Change in fair value included in income (15) 3 Ending Balance $ 13 $ 35 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 March 31, 2024 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Collateral-dependent loans receivable at fair value: CRE loans $ 5,095 $ — $ — $ 5,095 C&I loans 13,924 — — 13,924 Fair Value Measurements at the End of December 31, 2023 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Collateral-dependent loans receivable at fair value: CRE loans $ 3,475 $ — $ — $ 3,475 C&I loans 2,701 — — 2,701 Loans held for sale, net 2,287 — 2,287 — OREO 63 — — 63 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: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Assets: Collateral-dependent loans receivable at fair value: CRE loans $ (477) $ (166) C&I loans (4,341) (2,794) OREO — (271) Fair Value of Financial Instruments Carrying amounts and estimated fair values of financial instruments, not previously presented, at March 31, 2024 and December 31, 2023, were as follows: March 31, 2024 Carrying Amount Estimated Fair Value Fair Value Measurement (Dollars in thousands) Financial Assets: Cash and cash equivalents $ 1,185,296 $ 1,185,296 Level 1 Investment securities HTM 261,601 242,717 Level 2 Equity investments without readily determinable fair values 39,608 39,608 Level 2 Loans held for sale 2,763 2,768 Level 2 Loans receivable, net 13,560,420 13,162,050 Level 3 Accrued interest receivable 60,316 60,316 Level 2/3 Servicing assets, net 8,869 15,288 Level 3 Customers’ liabilities on acceptances 780 780 Level 2 Financial Liabilities: Noninterest bearing deposits $ 3,652,592 $ 3,652,592 Level 2 Money market, interest bearing demand and savings deposits 5,313,064 5,313,064 Level 2 Time deposits 5,787,761 5,793,249 Level 2 FHLB and FRB borrowings 795,634 797,206 Level 2 Convertible notes 444 434 Level 1 Subordinated debentures 108,148 97,376 Level 3 Accrued interest payable 122,467 122,467 Level 2 Acceptances outstanding 780 780 Level 2 December 31, 2023 Carrying Amount Estimated Fair Value Fair Value Measurement (Dollars in thousands) Financial Assets: Cash and cash equivalents $ 1,928,967 $ 1,928,967 Level 1 Investment securities HTM 263,912 250,518 Level 2 Equity investments without readily determinable fair values 39,387 39,387 Level 2 Loans held for sale 3,408 3,419 Level 2 Loans receivable, net 13,694,925 13,270,444 Level 3 Accrued interest receivable 61,720 61,720 Level 2/3 Servicing assets, net 9,631 14,853 Level 3 Customers’ liabilities on acceptances 471 471 Level 2 Financial Liabilities: Noninterest bearing deposits $ 3,914,967 $ 3,914,967 Level 2 Money market, interest bearing demand and savings deposits 4,872,029 4,872,029 Level 2 Time deposits 5,966,757 5,974,125 Level 2 FHLB and FRB borrowings 1,795,726 1,795,820 Level 2 Convertible notes, net 444 451 Level 1 Subordinated debentures 107,825 99,358 Level 3 Accrued interest payable 168,174 168,174 Level 2 Acceptances outstanding 471 471 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 was the estimated fair value for cash and cash equivalents, savings and other interest bearing demand deposits, equity investments without readily determinable fair values, customers’ 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 was determined through a discounted cash flow analysis, which incorporates probability of default and loss given default rates on an individual loan basis. For fixed rate loans, the discount rate used in a discounted cash flow analysis was based on the SOFR Swap Rate. For variable loans, the discount rate started with the underlying 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. Fair values of residential real estate loans included Fannie Mae and Freddie Mac prepayment speed assumptions or a third-party index based on historical prepayment speeds. Fair value of time deposits was based on discounted cash flow analyses 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 incorporated brokered time deposit offering rates. The fair value of the Company’s debt was based on current rates for similar financing with a liquidity premium added to assumed market spreads to reflect exit pricing and the marketability/liquidity costs contained with consummating an orderly transaction. Fair value for the Company’s convertible notes was 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 was not presented herein, as the fair value of these financial instruments was not material to the consolidated financial statements.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2024
Equity [Abstract]
Stockholders’ Equity	Stockholders’ Equity Total stockholders’ equity at March 31, 2024, was $2.11 billion, compared with $2.12 billion at December 31, 2023. In January 2022, the Company’s Board of Directors approved a share repurchase program that authorized the Company to repurchase up to $50.0 million of its common stock, of which an estimated $35.3 million remained available at March 31, 2024. During the three months ended March 31, 2024, the Company did not repurchase any shares of common stock as part of this program (see Part II, Item 2—“Unregistered Sales of Equity Securities and Use of Proceeds” for additional information). For the three months ended March 31, 2024 and 2023, the Company paid total dividends of $0.14 per common share. The following table presents the changes to accumulated other comprehensive loss for the three months ended March 31, 2024 and 2023: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Balance at beginning of period $ (204,738) $ (230,857) Unrealized net (losses) gains on securities available for sale (13,734) 31,215 Unrealized net losses on interest rate contracts used for cash flow hedges (8,186) (5,938) Reclassification adjustments for net gains realized in net income (2,931) (1,738) Tax effect 7,311 (6,939) Other comprehensive (loss) income, net of tax (17,540) 16,600 Balance at end of period $ (222,278) $ (214,257) Reclassifications for net gains and losses realized in net income for the three months ended March 31, 2024 and 2023, related to net gains on interest rate contracts designated as cash flow hedges and amortization on unrealized losses from transferred investment securities to HTM. Gains and losses on interest rate contracts are recorded in interest expense in the Consolidated Statements of Income. The unrealized holding losses at the date of transfer on securities HTM will continue to be reported, net of taxes, in AOCI as a component of stockholders’ equity and be amortized over the remaining life of the securities as an adjustment of yield, offsetting the impact on yield of the corresponding discount amortization. For the three months ended March 31, 2024 and 2023, the Company reclassified net gains of $3.8 million and $2.8 million on interest rate contracts designated as cash flow hedges, respectively, from other comprehensive loss to interest income and interest expense. For the three months ended March 31, 2024, the Company recorded a reclassification adjustment of $847 thousand from other comprehensive loss to a reduction of interest income, to amortize transferred unrealized losses to investment securities HTM, compared with $1.0 million for the three months ended March 31, 2023.

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2024
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, stock appreciation rights (“SAR”), restricted stock, performance shares, and performance units to non-employee directors and employees 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 provides the Company flexibility to (i) attract and retain qualified non-employee directors, executives, and other key employees with appropriate equity-based awards; (ii) motivate high levels of performance; (iii) recognize employees’ 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. In 2023, an additional 150,000 shares of common stock were made available to be issued in connection with grants of restricted stock to be granted as inducement awards for potential new employment with the Company under the 2019 Plan as Exempt Awards and pursuant to Nasdaq Listing Rule 5635(c)(4); this pool was not previously approved by stockholders. These additional shares are not available to persons who previously served as an employee or director of the Company, other than following a bona fide period of non-employment. The Company has not issued, and does not expect to issue, any shares under this 150,000 inducement award pool. At March 31, 2024, there were 96,233 remaining shares available for future grants under the 2019 plan, excluding the 150,000 shares for inducement awards. The pool of available shares can be partially replenished for future grants to the extent there are forfeitures, expirations or otherwise terminations of existing equity awards without issuance of the shares underlying such awards. 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 With the exception of the shares that are 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 three months ended March 31, 2024: Number of Shares Weighted-Average Exercise Price Per Share Weighted-Average Aggregate Intrinsic Value (Dollars in thousands) Outstanding - January 1, 2024 629,367 $ 16.61 Granted — — Exercised — — Expired (28,136) 15.23 Forfeited — — Outstanding - March 31, 2024 601,231 $ 16.68 1.74 $ — Options exercisable - March 31, 2024 601,231 $ 16.68 1.74 $ — The following is a summary of the Company’s restricted stock and performance unit activity for the three months ended March 31, 2024: Number of Shares Weighted-Average Grant Date Fair Value Outstanding (unvested) - January 1, 2024 2,043,621 $ 12.09 Granted 34,634 15.49 Vested (771,422) 12.82 Forfeited (70,622) 15.04 Outstanding (unvested) - March 31, 2024 1,236,211 $ 11.56 The total fair value of restricted stock and performance units vested during the three months ended March 31, 2024 and 2023, was $8.5 million and $6.2 million, respectively. The total amounts charged against income related to stock-based payment arrangements were $2.7 million and $2.4 million for the three months ended March 31, 2024 and 2023, respectively. The income tax benefit recognized was approximately $751 thousand and $609 thousand for the three months ended March 31, 2024 and 2023, respectively. Since all stock option grants were vested at March 31, 2024, there was no unrecognized compensation expense related to non-vested stock option grants for the three months ended March 31, 2024. Unrecognized compensation expense related to non-vested restricted stock and performance units for the three months ended March 31, 2024 was $8.5 million, and is expected to be recognized over a weighted average vesting period of 1.45 years.

Regulatory Matters

Regulatory Matters	3 Months Ended
	Mar. 31, 2024
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. At March 31, 2024, 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 purchased credit deteriorated (“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. At March 31, 2024 and December 31, 2023, 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 a minimum total capital ratio, Tier 1 capital ratio, common equity Tier 1 capital ratio, and leverage ratio 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 Ratio Required for Capital Adequacy Purposes Ratio Required To Be Well-Capitalized Ratio Required for Minimum Capital Adequacy With Capital Conservation Buffer March 31, 2024 Amount Ratio (Dollars in thousands) Common equity Tier 1 capital Company $ 1,872,360 12.47 % 4.50 % N/A 7.00 % Bank $ 1,948,503 12.99 % 4.50 % 6.50 % 7.00 % Tier 1 capital Company $ 1,976,607 13.17 % 6.00 % N/A 8.50 % Bank $ 1,948,503 12.99 % 6.00 % 8.00 % 8.50 % Total capital Company $ 2,130,033 14.19 % 8.00 % N/A 10.50 % Bank $ 2,101,929 14.01 % 8.00 % 10.00 % 10.50 % Leverage capital Company $ 1,976,607 10.42 % 4.00 % N/A N/A Bank $ 1,948,503 10.27 % 4.00 % 5.00 % N/A Actual Ratio Required for Capital Adequacy Purposes Ratio Required To Be Well-Capitalized Ratio Required for Minimum Capital Adequacy With Capital Conservation Buffer December 31, 2023 Amount Ratio (Dollars in thousands) Common equity Tier 1 capital Company $ 1,869,774 12.28 % 4.50 % N/A 7.00 % Bank $ 1,940,303 12.75 % 4.50 % 6.50 % 7.00 % Tier 1 capital Company $ 1,973,698 12.96 % 6.00 % N/A 8.50 % Bank $ 1,940,303 12.75 % 6.00 % 8.00 % 8.50 % Total capital Company $ 2,120,157 13.92 % 8.00 % N/A 10.50 % Bank $ 2,086,762 13.71 % 8.00 % 10.00 % 10.50 % Leverage capital Company $ 1,973,698 10.11 % 4.00 % N/A N/A Bank $ 1,940,303 9.94 % 4.00 % 5.00 % N/A

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition The Company recognizes revenue when obligations under the terms of a contract with customers are satisfied. ASU 2014-09 (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 March 31, 2024 2023 (Dollars in thousands) Noninterest bearing deposit account income: Monthly service charges $ 244 $ 245 Customer analysis charges 1,423 1,126 NSF charges 814 735 Other service charges 79 91 Total noninterest bearing deposit account income 2,560 2,197 Interest bearing deposit account income: Monthly service charges 27 24 Total service fees on deposit accounts $ 2,587 $ 2,221 Wire transfer fee income: Wire transfer fees $ 263 $ 406 Foreign exchange fees 549 367 Total wire transfer fees $ 812 $ 773

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2024
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On April 26, 2024, the Company entered into a merger agreement with Territorial Bancorp Inc. (“Territorial”), headquartered in Honolulu, Hawai‘i. Under the terms of the merger agreement, Territorial will merge with and into the Company, immediately followed by the merger of Territorial’s subsidiary bank, Territorial Savings Bank, with and into the Company’s subsidiary bank, Bank of Hope. Upon completion of the transaction, Territorial shareholders will receive a fixed exchange ratio of 0.8048 shares of the Company’s common stock in exchange for each share of Territorial common stock they own. Based on the closing price of the Company’s common stock on April 26, 2024, this represents a value of $8.82 per share of Territorial common stock, although the actual value will be determined upon the completion of the merger. The transaction is expected to close by year-end 2024, subject to regulatory approvals, the approval of Territorial shareholders, and the satisfaction of other customary closing conditions. Following the completion of the transaction, the legacy Territorial franchise in Hawai‘i will continue to do business under the Territorial Savings Bank brand, as a trade name of Bank of Hope.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Basic EPS - common stock	$ 25,864	$ 39,121

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2024
Basis Of Presentation [Abstract]
Consolidation	The consolidated financial statements include the accounts of Hope Bancorp and its wholly owned subsidiaries, principally the Bank. 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 March 31, 2024 and December 31, 2023, and the results of operations for the three months ended March 31, 2024 and 2023. 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	Recently Issued Accounting Pronouncements Not Yet Adopted There were no recently issued accounting pronouncements not yet adopted that are expected to have a material impact on the Company’s consolidated financial statements. SEC Final Rules On March 6, 2024, the SEC adopted final rules that require companies to disclose certain climate-related information such as material climate-related risks; activities to mitigate or adapt to such risks; information about the registrant's board of directors' oversight of climate-related risks and management’s role in managing material climate-related risks; and information on any climate-related targets or goals that are material to the registrant's business, results of operations, or financial condition. In April 2024, the SEC voluntarily stayed the rule pending judicial review. Subject to the results of judicial review, the final rules would be effective for the fiscal year beginning on December 31, 2025. The Company is still assessing the impact of the final rules.
Financing Receivables	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 differentiates its loan segments based on shared risk characteristics for which allowance for credit losses is measured on a collective basis. Risk Characteristics CRE loans Property type, location, owner-occupied status C&I loans Delinquency status, risk rating, industry type Residential mortgage loans FICO score, LTV, delinquency status, maturity date, collateral value, location Consumer and other loans Historical losses 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 the calculation of the allowance for credit losses for collectively assessed loans. The Company uses a reasonable and supportable period of two years, at which point loss assumptions revert back to historical loss information by means of one-year reversion period. Included in the quantitative portion of the ACL analysis are inputs such as borrowers’ net operating income, debt coverage ratios, real estate collateral values, as well as factors that are more subjective or require management’s judgment, including key macroeconomic variables from Moody’s forecast scenarios such as GDP, unemployment rates, interest rates, and CRE prices. These key inputs are utilized in the Company’s models to develop PD and LGD assumptions used in the calculation of estimated quantitative losses. The ACL for the Company’s construction, credit card, and certain consumer loans is calculated based on a non-modeled approach that utilizes 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 the aggregate, non-modeled loans represented less than 2% of the Company’s total loan portfolio at March 31, 2024. 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. At March 31, 2024, the Company utilized the March 2024 consensus economic forecast scenario from Moody’s, as it best aligned with management’s expectations of future conditions. The forecast projected GDP growth of 1.4% in 2024, 2.0% for 2025, and 1.9% for 2026, with unemployment projected to be 4.1% for 2024, 4.1% for 2025, and 3.9% in 2026. CRE prices in the consensus scenario were expected to decrease initially, with the CRE price index declining -6.7% for 2024, before rebounding +6.0% for 2025 and +8.0% in 2026. The Company also utilized Moody’s December 2023 consensus economic forecast for the calculation of the December 31, 2023 ACL. In order to 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 Interagency Policy Statement on the Allowance for Credit 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, and other loan modifications; • Changes in the quality of the loan review system and the degree of oversight by the management and the Board of 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 that do not share similar risk characteristics such as nonaccrual loans above $1.0 million, the Company evaluates these loans on an individual basis in accordance with ASC 326. Such nonaccrual loans are considered to have different risk profiles than performing loans and are therefore evaluated individually. The Company elected to collectively assess nonaccrual loans with balances below $1.0 million along with the performing and accrual loans, in order to reduce the operational burden of individually assessing small 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 loss on loans. The Company maintains a separate ACL for its off-balance-sheet unfunded loan commitments. The Company uses an estimated funding rate to allocate an 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 look-back period of eight quarters. Credit loss is not estimated for off-balance-sheet credit exposures that are unconditionally cancellable by the Company.

Accounting Policies (Tables)

Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Accounting Standards Update and Change in Accounting Principle	Accounting Pronouncements Adopted In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures” which expands segment disclosure requirements for public entities. ASU 2023-07 requires disclosure of significant segment expenses and other segment items on annual and interim periods about a reportable segment’s profit or loss and assets that are currently required annually. This guidance is effective for public entities for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The Company is currently evaluating the impact of adopting ASU 2023-07.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2024
Earnings Per Share [Abstract]
Computation of basic and diluted EPS	The following table presents computations of basic and diluted EPS for the three months ended March 31, 2024 and 2023. Three Months Ended March 31, 2024 2023 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 $ 25,864 120,187,300 $ 0.22 $ 39,121 119,551,247 $ 0.33 Effect of dilutive securities: Stock options and restricted stock 832,992 691,048 Diluted EPS - common stock $ 25,864 121,020,292 $ 0.21 $ 39,121 120,242,295 $ 0.33

Equity Investments (Tables)

Equity Investments (Tables)	3 Months Ended
	Mar. 31, 2024
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 months ended March 31, 2024 and 2023, were recorded in other noninterest income and fees as summarized in the table below: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Net change in fair value recorded during the period on equity investments with readily determinable fair value $ (46) $ 69 Less: 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 held at the end of the period $ (46) $ 69

Securities Available for Sale (

Securities Available for Sale (Tables)	3 Months Ended
	Mar. 31, 2024
Debt Securities, Available-for-Sale [Abstract]
Summary of Securities Available for Sale	The following is a summary of investment securities as of the dates indicated: March 31, 2024 December 31, 2023 Amortized Gross Gross Fair Amortized Gross Gross Fair (Dollars in thousands) Debt securities AFS: U.S. Treasury securities $ 3,999 $ — $ (9) $ 3,990 $ 103,691 $ 21 $ (35) $ 103,677 U.S. Government agency and U.S. Government sponsored enterprises: Agency securities 4,000 — (107) 3,893 4,000 — (100) 3,900 Collateralized mortgage obligations (“CMO”) 876,038 403 (145,248) 731,193 888,631 367 (141,279) 747,719 Mortgage-backed securities (“MBS”): Residential 490,009 — (85,656) 404,353 499,431 — (79,133) 420,298 Commercial 458,834 21 (55,763) 403,092 445,207 113 (53,432) 391,888 Asset-backed securities 139,300 270 (58) 139,512 150,992 — (1,322) 149,670 Corporate securities 23,290 — (3,883) 19,407 23,302 — (3,868) 19,434 Municipal securities 319,402 4,134 (12,587) 310,949 314,554 5,698 (11,779) 308,473 Total investment securities AFS $ 2,314,872 $ 4,828 $ (303,311) $ 2,016,389 $ 2,429,808 $ 6,199 $ (290,948) $ 2,145,059 Debt securities HTM: U.S. Government agency and U.S. Government sponsored enterprises: MBS: Residential $ 148,784 $ — $ (10,646) $ 138,138 $ 150,369 $ — $ (6,663) $ 143,706 Commercial 112,817 — (8,238) 104,579 113,543 — (6,731) 106,812 Total investment securities HTM $ 261,601 $ — $ (18,884) $ 242,717 $ 263,912 $ — $ (13,394) $ 250,518
Interest Income	The following table presents a breakdown of interest income recorded for investment securities that are taxable and nontaxable. Three Months Ended March 31, 2024 2023 (Dollars in thousands) Interest income on investment securities Taxable $ 16,982 $ 14,046 Nontaxable 1,067 1,079 Total $ 18,049 $ 15,125
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair value of investment securities at March 31, 2024, by contractual maturity, are presented in the table below. Collateralized mortgage obligations, mortgage-backed securities, and asset-backed securities are presented by final maturity. 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. Available for Sale Held to Maturity Amortized Estimated Amortized Estimated (Dollars in thousands) Debt securities: Due within one year $ 3,999 $ 3,990 $ — $ — Due after one year through five years 155,732 146,039 25,116 24,232 Due after five years through ten years 95,794 85,941 8,679 8,256 Due after ten years 2,059,347 1,780,419 227,806 210,229 Total $ 2,314,872 $ 2,016,389 $ 261,601 $ 242,717
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. The length of time that the individual securities have been in a continuous unrealized loss position is not a factor in determining credit impairment with the adoption of current expected credit losses (“CECL”). March 31, 2024 Less than 12 months 12 months or longer Total Description of Number Fair Gross Number Fair Gross Number Fair Gross (Dollars in thousands) U.S. Treasury securities — $ — $ — 1 $ 3,990 $ (9) 1 $ 3,990 $ (9) U.S. Government agency and U.S. Government sponsored enterprises: Agency securities — — — 1 3,893 (107) 1 3,893 (107) CMOs 1 5,510 (229) 115 700,005 (145,019) 116 705,515 (145,248) MBS: Residential 1 2,591 (164) 64 401,762 (85,492) 65 404,353 (85,656) Commercial 12 77,736 (2,308) 53 323,928 (53,455) 65 401,664 (55,763) Asset-backed securities 2 14,750 — 3 27,492 (58) 5 42,242 (58) Corporate securities — — — 6 19,407 (3,883) 6 19,407 (3,883) Municipal securities 16 63,375 (516) 42 90,383 (12,071) 58 153,758 (12,587) Total 32 $ 163,962 $ (3,217) 285 $ 1,570,860 $ (300,094) 317 $ 1,734,822 $ (303,311) December 31, 2023 Less than 12 months 12 months or longer Total Description of Number Fair Gross Number Fair Gross Number Fair Gross (Dollars in thousands) U.S. Treasury securities — $ — $ — 1 $ 3,963 $ (35) 1 $ 3,963 $ (35) U.S. Government agency and U.S. Government sponsored enterprises: Agency securities — — — 1 3,900 (100) 1 3,900 (100) CMOs 3 19,800 (378) 115 717,662 (140,901) 118 737,462 (141,279) MBS: Residential — — — 65 420,298 (79,133) 65 420,298 (79,133) Commercial 6 53,255 (2,129) 53 331,450 (51,303) 59 384,705 (53,432) Asset-backed securities — — — 18 149,670 (1,322) 18 149,670 (1,322) Corporate securities — — — 6 19,434 (3,868) 6 19,434 (3,868) Municipal securities 11 42,760 (263) 42 91,707 (11,516) 53 134,467 (11,779) Total 20 $ 115,815 $ (2,770) 301 $ 1,738,084 $ (288,178) 321 $ 1,853,899 $ (290,948)

Loans Receivable and Allowanc_2

Loans Receivable and Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2024
Receivables [Abstract]
Summary of Loans Receivable by Major Category	The following is a summary of loans receivable by segment: March 31, 2024 December 31, 2023 (Dollars in thousands) Loan portfolio composition Commercial real estate (“CRE”) loans $ 8,707,673 $ 8,797,884 Commercial and industrial (“C&I”) loans 4,041,063 4,135,044 Residential mortgage loans 936,035 883,687 Consumer and other loans 34,407 37,004 Total loans receivable, net of deferred costs and fees 13,719,178 13,853,619 Allowance for credit losses (158,758) (158,694) Loans receivable, net of allowance for credit losses $ 13,560,420 $ 13,694,925
Allowance for Credit Losses by Portfolio Segment	The tables below detail the activity in the allowance for credit losses (“ACL”) by portfolio segment for the three months ended March 31, 2024 and 2023. CRE Loans C&I Loans Residential Mortgage Loans Consumer and Other Loans Total (Dollars in thousands) Three Months Ended March 31, 2024 Balance, beginning of period $ 93,940 $ 51,291 $ 12,838 $ 625 $ 158,694 Provision (credit) for credit loss on loans (3,614) 8,246 (896) (136) 3,600 Loans charged off (38) (4,619) — (63) (4,720) Recoveries of charge offs 535 547 — 102 1,184 Balance, end of period $ 90,823 $ 55,465 $ 11,942 $ 528 $ 158,758 CRE Loans C&I Loans Residential Mortgage Loans Consumer and Other Loans Total (Dollars in thousands) Three Months Ended March 31, 2023 Balance, beginning of period $ 95,884 $ 56,872 $ 8,920 $ 683 $ 162,359 ASU 2022-02 day 1 adoption adjustment 19 (426) — — $ (407) Provision (credit) for credit loss on loans 12,863 (13,500) 2,333 4 1,700 Loans charged off — (440) — (55) (495) Recoveries of charge offs 69 284 — 34 387 Balance, end of period $ 108,835 $ 42,790 $ 11,253 $ 666 $ 163,544 The following tables break out the allowance for credit losses and loan balance by measurement methodology at March 31, 2024 and December 31, 2023: March 31, 2024 CRE Loans C&I Loans Residential Mortgage Loans Consumer and Other Loans Total (Dollars in thousands) Allowance for credit losses: Individually evaluated $ 1,142 $ 4,466 $ 26 $ 3 $ 5,637 Collectively evaluated 89,681 50,999 11,916 525 153,121 Total $ 90,823 $ 55,465 $ 11,942 $ 528 $ 158,758 Loans outstanding: Individually evaluated $ 84,885 $ 15,071 $ 6,343 $ 276 $ 106,575 Collectively evaluated 8,622,788 4,025,992 929,692 34,131 13,612,603 Total $ 8,707,673 $ 4,041,063 $ 936,035 $ 34,407 $ 13,719,178 December 31, 2023 CRE Loans C&I Loans Residential Mortgage Loans Consumer and Other Loans Total (Dollars in thousands) Allowance for credit losses: Individually evaluated $ 886 $ 1,721 $ 39 $ 14 $ 2,660 Collectively evaluated 93,054 49,570 12,799 611 156,034 Total $ 93,940 $ 51,291 $ 12,838 $ 625 $ 158,694 Loans outstanding: Individually evaluated $ 33,932 $ 5,013 $ 5,916 $ 343 $ 45,204 Collectively evaluated 8,763,952 4,130,031 877,771 36,661 13,808,415 Total $ 8,797,884 $ 4,135,044 $ 883,687 $ 37,004 $ 13,853,619
Schedule of Nonaccrual Loans and Loans Past Due 90 or More Days And Still on Accrual Status	The tables below represent the amortized cost of nonaccrual loans, as well as loans past due 90 or more days and still on accrual status, by loan segment and broken out by loans with a recorded ACL and those without a recorded ACL, at March 31, 2024 and December 31, 2023. March 31, 2024 Nonaccrual with No ACL Nonaccrual with an ACL Total Nonaccrual (1) Accruing Loans Past Due 90 Days or More (Dollars in thousands) CRE loans $ 27,273 $ 10,563 $ 37,836 $ 47,049 C&I loans 194 14,876 15,070 185 Residential mortgage loans 2,990 3,354 6,344 — Consumer and other loans — 276 276 56 Total $ 30,457 $ 29,069 $ 59,526 $ 47,290 December 31, 2023 Nonaccrual with No ACL Nonaccrual with an ACL Total Nonaccrual (1) Accruing Loans Past Due 90 Days or More (Dollars in thousands) CRE loans $ 26,724 $ 7,208 $ 33,932 $ — C&I loans 2,447 2,566 5,013 184 Residential mortgage loans 3,002 2,914 5,916 — Consumer and other loans — 343 343 77 Total $ 32,173 $ 13,031 $ 45,204 $ 261 __________________________________ (1)
Amortized Cost Basis of Collateral-Dependent Loans	The following table presents the amortized cost of collateral-dependent loans at March 31, 2024 and December 31, 2023: March 31, 2024 December 31, 2023 Real Estate Collateral Other Collateral Total Real Estate Collateral Other Collateral Total (Dollars in thousands) CRE loans $ 31,795 $ — $ 31,795 $ 29,803 $ — $ 29,803 C&I loans 194 3,694 3,888 2,447 1,708 4,155 Residential mortgage loans 2,990 — 2,990 3,002 — 3,002 Consumer and other loans — — — — — — Total $ 34,979 $ 3,694 $ 38,673 $ 35,252 $ 1,708 $ 36,960
Interest income reversal, nonaccrual, by loan segment	The following table presents interest income reversals, due to loans being placed on nonaccrual status, by loan segment for the three months ended March 31, 2024 and 2023: Three Months Ended March 31, 2024 2023 (Dollars in thousands) CRE loans $ 191 $ 451 C&I loans 588 518 Residential mortgage loans 6 14 Total $ 785 $ 983
Aging of Past Due Loans	The following table presents the amortized cost of past due loans, including nonaccrual loans past due 30 or more days, by the number of days past due at March 31, 2024 and December 31, 2023, by loan segment: March 31, 2024 December 31, 2023 30-59 Days 60-89 Days 90 Days or More Total 30-59 Days 60-89 Days 90 Days or More Total (Dollars in thousands) CRE loans $ 2,814 $ 1,764 $ 61,642 $ 66,220 $ 1,999 $ 2,976 $ 10,197 $ 15,172 C&I loans 483 349 626 1,458 934 533 1,717 3,184 Residential mortgage loans — 540 1,946 2,486 1,534 — 2,339 3,873 Consumer and other loans 332 74 56 462 214 48 77 339 Total Past Due $ 3,629 $ 2,727 $ 64,270 $ 70,626 $ 4,681 $ 3,557 $ 14,330 $ 22,568
Financing Receivable Credit Quality Indicators	The following table presents the amortized cost basis of loans receivable by segment, risk rating, and year of origination, renewal, or major modification at March 31, 2024 and December 31, 2023. March 31, 2024 Term Loan by Year Revolving Loans Total 2024 2023 2022 2021 2020 Prior (Dollars in thousands) CRE loans Pass $ 171,109 $ 598,990 $ 2,398,974 $ 1,998,868 $ 1,188,980 $ 2,115,568 $ 76,726 $ 8,549,215 Special mention — 14,991 — 18,984 3,319 13,774 — 51,068 Substandard — — 940 26,099 32,521 47,830 — 107,390 Subtotal $ 171,109 $ 613,981 $ 2,399,914 $ 2,043,951 $ 1,224,820 $ 2,177,172 $ 76,726 $ 8,707,673 Year-to-date gross charge offs $ — $ — $ — $ — $ — $ 38 $ — $ 38 C&I loans Pass $ 454,730 $ 813,203 $ 1,087,252 $ 601,332 $ 187,564 $ 156,808 $ 483,974 $ 3,784,863 Special mention 8,760 23,833 30,931 28,699 — 14,594 57,298 164,115 Substandard 10,140 7,479 55,470 8,324 8,484 1,596 592 92,085 Subtotal $ 473,630 $ 844,515 $ 1,173,653 $ 638,355 $ 196,048 $ 172,998 $ 541,864 $ 4,041,063 Year-to-date gross charge offs $ — $ — $ 4,569 $ 29 $ — $ 21 $ — $ 4,619 Residential mortgage loans Pass $ 69,478 $ 92,651 $ 360,664 $ 259,765 $ 1,347 $ 145,531 $ — $ 929,436 Special mention — — — — — — — — Substandard — — — 853 1,836 3,910 — 6,599 Subtotal $ 69,478 $ 92,651 $ 360,664 $ 260,618 $ 3,183 $ 149,441 $ — $ 936,035 Year-to-date gross charge offs $ — $ — $ — $ — $ — $ — $ — $ — Consumer and other loans Pass $ 3,782 $ 741 $ 539 $ 249 $ 1,788 $ 8,768 $ 18,264 $ 34,131 Special mention — — — — — — — — Substandard — — — — — 276 — 276 Subtotal $ 3,782 $ 741 $ 539 $ 249 $ 1,788 $ 9,044 $ 18,264 $ 34,407 Year-to-date gross charge offs $ — $ — $ — $ — $ — $ — $ 63 $ 63 Total loans Pass $ 699,099 $ 1,505,585 $ 3,847,429 $ 2,860,214 $ 1,379,679 $ 2,426,675 $ 578,964 $ 13,297,645 Special mention 8,760 38,824 30,931 47,683 3,319 28,368 57,298 215,183 Substandard 10,140 7,479 56,410 35,276 42,841 53,612 592 206,350 Total $ 717,999 $ 1,551,888 $ 3,934,770 $ 2,943,173 $ 1,425,839 $ 2,508,655 $ 636,854 $ 13,719,178 Total year-to-date gross charge offs $ — $ — $ 4,569 $ 29 $ — $ 59 $ 63 $ 4,720 December 31, 2023 Term Loan by Year Revolving Loans Total 2023 2022 2021 2020 2019 Prior (Dollars in thousands) CRE loans Pass $ 623,058 $ 2,429,146 $ 2,045,863 $ 1,239,654 $ 996,483 $ 1,297,295 $ 79,426 $ 8,710,925 Special mention — 2,001 15,452 2,518 5,963 5,196 — 31,130 Substandard — 1,549 7,300 2,711 2,083 42,186 — 55,829 Subtotal $ 623,058 $ 2,432,696 $ 2,068,615 $ 1,244,883 $ 1,004,529 $ 1,344,677 $ 79,426 $ 8,797,884 Year-to-date gross charge offs $ 103 $ 315 $ — $ 233 $ 355 $ 1,941 $ — $ 2,947 C&I loans Pass $ 1,107,219 $ 1,208,795 $ 683,821 $ 203,142 $ 162,815 $ 61,019 $ 479,266 $ 3,906,077 Special mention 9,743 23,413 31,388 8,597 14,614 — 60,107 147,862 Substandard 7,158 53,213 8,480 8,637 290 2,358 969 81,105 Subtotal $ 1,124,120 $ 1,285,421 $ 723,689 $ 220,376 $ 177,719 $ 63,377 $ 540,342 $ 4,135,044 Year-to-date gross charge offs $ 5,011 $ 12,323 $ 16,020 $ 128 $ 182 $ 539 $ — $ 34,203 Residential mortgage loans Pass $ 93,982 $ 365,252 $ 263,977 $ 1,356 $ 29,063 $ 123,885 $ — $ 877,515 Special mention — — — — — — — — Substandard — — 314 1,836 957 3,065 — 6,172 Subtotal $ 93,982 $ 365,252 $ 264,291 $ 3,192 $ 30,020 $ 126,950 $ — $ 883,687 Year-to-date gross charge offs $ — $ — $ — $ — $ — $ — $ — $ — Consumer and other loans Pass $ 3,985 $ 944 $ 278 $ 2,068 $ 371 $ 8,221 $ 20,794 $ 36,661 Special mention — — — — — — — — Substandard — — — — — 343 — 343 Subtotal $ 3,985 $ 944 $ 278 $ 2,068 $ 371 $ 8,564 $ 20,794 $ 37,004 Year-to-date gross charge offs $ — $ — $ — $ — $ — $ — $ 370 $ 370 Total loans Pass $ 1,828,244 $ 4,004,137 $ 2,993,939 $ 1,446,220 $ 1,188,732 $ 1,490,420 $ 579,486 $ 13,531,178 Special mention 9,743 25,414 46,840 11,115 20,577 5,196 60,107 178,992 Substandard 7,158 54,762 16,094 13,184 3,330 47,952 969 143,449 Total $ 1,845,145 $ 4,084,313 $ 3,056,873 $ 1,470,519 $ 1,212,639 $ 1,543,568 $ 640,562 $ 13,853,619 Total year-to-date gross charge offs $ 5,114 $ 12,638 $ 16,020 $ 361 $ 537 $ 2,480 $ 370 $ 37,520 For the three months ended March 31, 2024 and the twelve months ended December 31, 2023, there were no revolving loans converted to term loans.
Loans Sold From Loans Held For Investment	The breakdown of loans by segment that were reclassified from held for investment to held for sale for the three months ended March 31, 2024 and 2023, is presented in the following table: Three Months Ended March 31, 2024 2023 Transfer of loans held for investment to held for sale (Dollars in thousands) CRE loans $ — $ 53,608 C&I loans — 108,875 Total $ — $ 162,483
Summary of Loans Modified	A summary of loans modified to borrowers experiencing financial difficulty for the period presented, disaggregated by loan class and type of modification, is shown in the tables below. Three Months Ended March 31, 2024 CRE Loans C&I Loans Residential Mortgage Loans Consumer and Other Loans Total (Dollars in thousands) Principal forgiveness $ — $ 10,140 $ — $ — $ 10,140 Interest rate reduction — — — — — Payment delay — — — — — Term extension — — — — — Total Loan Modifications $ — $ 10,140 $ — $ — $ 10,140 % of Loan Class — % 0.25 % — % — % 0.07 % There were no loans modified to borrowers experiencing financial difficulty during the three months ended March 31, 2023. The following table describes the financial effect of the loan modifications made to borrowers experiencing financial difficulty for the periods presented: Three Months Ended March 31, 2024 Modification & Loan Types Financial Effect Principal forgiveness: C&I loans Forgiveness of principal totaling $4.4 million

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2024
Leases [Abstract]
Summary of Net Lease Cost and Other Information	The table below summarizes the Company’s net operating lease cost: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Operating lease cost $ 3,606 $ 3,841 Variable lease cost 808 783 Sublease income (39) (42) Net lease cost $ 4,375 $ 4,582 The table below summarizes other information related to the Company’s operating leases: At or for the Three Months Ended 2024 2023 (Dollars in thousands) Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows for operating leases $ 3,981 $ 3,961 ROU assets obtained in exchange for lease liabilities, net 712 2,031 Weighted-average remaining lease term - operating leases 3.9 years 4.5 years Weighted-average discount rate - operating leases 2.84 % 2.52 %
Summary of Maturity of Remaining Lease Liabilities	The table below summarizes the maturity of remaining lease liabilities: March 31, 2024 (Dollars in thousands) 2024 $ 11,620 2025 14,144 2026 13,451 2027 7,932 2028 3,043 2029 and thereafter 2,575 Total lease payments 52,765 Less: imputed interest 3,016 Total lease obligations $ 49,749

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2024
Deposits [Abstract]
Schedule of Deposits	The following is a breakdown of the Company’s deposits at March 31, 2024 and December 31, 2023: March 31, 2024 December 31, 2023 Balance Percentage (%) Balance Percentage (%) (Dollars in thousands) Noninterest bearing demand deposits $ 3,652,592 25 % $ 3,914,967 27 % Money market and NOW accounts 4,393,971 30 % 4,169,543 28 % Savings deposits 919,093 6 % 702,486 5 % Time deposits 5,787,761 39 % 5,966,757 40 % Total deposits $ 14,753,417 100 % $ 14,753,753 100 %

Borrowings (Tables)

Borrowings (Tables)	3 Months Ended
	Mar. 31, 2024
Debt Disclosure [Abstract]
Schedule of Borrowing Lines	The tables below summarize the Company’s borrowing lines at March 31, 2024 and December 31, 2023: March 31, 2024 Total Borrowings Outstanding Available Borrowing Capacity Amount Weighted Average Rate (Dollars in thousands) FHLB $ 4,209,620 $ 100,000 5.59 % $ 4,109,620 FRB Discount Window 653,520 — — % 653,520 FRB Bank Term Funding Program (“BTFP”) 695,634 695,634 4.61 % — Unsecured Federal Funds lines 311,815 — — % 311,815 Total $ 5,870,589 $ 795,634 4.73 % $ 5,074,955 December 31, 2023 Total Borrowings Outstanding Available Borrowing Capacity Amount Weighted Average Rate (Dollars in thousands) FHLB $ 4,167,168 $ 100,000 5.73 % $ 4,067,168 FRB Discount Window 630,369 — — % 630,369 BTFP 1,707,909 1,695,726 4.47 % 12,183 Unsecured Federal Funds lines 312,315 — — % 312,315 Total $ 6,817,761 $ 1,795,726 4.54 % $ 5,022,035

Subordinated Debentures and C_2

Subordinated Debentures and Convertible Notes (Tables)	3 Months Ended
	Mar. 31, 2024
Subordinated Borrowings [Abstract]
Convertible Debt	The carrying value of the convertible notes at March 31, 2024 and December 31, 2023, was $444 thousand. The capitalized issuance costs were fully amortized at both March 31, 2024 and December 31, 2023. Interest expense on the convertible notes for the three months ended March 31, 2024 and 2023, totaled $2 thousand and $1.3 million, respectively.

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments, Fair Value	The tables below present the fair value of the Company’s derivative financial instruments at March 31, 2024 and December 31, 2023. The Company’s derivative assets and derivative liabilities are located within “Other assets” and “Other liabilities,” respectively, on the Company’s Consolidated Statements of Financial Condition. March 31, 2024 Notional Fair Value (1) Other Assets Other Liabilities (Dollars in thousands) Derivatives designated as cash flow hedges Interest rate swaps $ 725,000 $ — $ — Interest rate collars 500,000 — 3,860 Forward interest rate swaps 1,000,000 281 7,430 Total $ 2,225,000 $ 281 $ 11,290 Derivatives not designated as hedges Interest rate contracts with correspondent banks $ 1,092,318 $ 62,141 $ 210 Interest rate contracts with customers 1,092,318 210 63,693 Foreign exchange contracts with correspondent banks 7,932 111 7 Foreign exchange contracts with customers 620 17 — Risk participation agreement 149,707 — 13 Mortgage banking derivatives 2,500 7 6 Total $ 2,345,395 $ 62,486 $ 63,929 __________________________________ (1) The fair values of centrally-cleared derivative contracts are presented net of settled-to-market margin. December 31, 2023 Notional Fair Value (1) Other Assets Other Liabilities (Dollars in thousands) Derivatives designated as cash flow hedges Interest rate swaps $ 725,000 $ — $ — Interest rate collars 250,000 — 1,149 Forward interest rate swaps 1,000,000 10,812 — Forward interest rate collars 250,000 148 — Total $ 2,225,000 $ 10,960 $ 1,149 Derivatives not designated as hedges Interest rate contracts with correspondent banks $ 1,096,292 $ 53,185 $ 1,117 Interest rate contracts with customers 1,096,292 1,117 54,505 Foreign exchange contracts with correspondent banks 10,739 4 202 Foreign exchange contracts with customers 1,744 57 — Risk participation agreement 130,365 — 28 Mortgage banking derivatives 1,377 7 17 Total $ 2,336,809 $ 54,370 $ 55,869 __________________________________ (1) The fair values of centrally-cleared derivative contracts are presented net of settled-to-market margin.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments	commitments described below at the dates indicated below: March 31, 2024 December 31, 2023 (Dollars in thousands) Commitments to extend credit $ 2,105,176 $ 2,274,239 Standby letters of credit 132,811 132,132 Other letters of credit 30,645 51,983 Commitments to fund investments in affordable housing partnerships 20,675 21,017 The Company is a party to financial instruments with off-balance-sheet risk in the normal course of business to meet the financing needs of its 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.

Goodwill, Intangible Assets, _2

Goodwill, Intangible Assets, and Servicing Assets (Tables)	3 Months Ended
	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	The following table provides information regarding the core deposit intangibles at March 31, 2024 and December 31, 2023: March 31, 2024 December 31, 2023 Core Deposit Intangibles Related To: Amortization Period Gross Accumulated Carrying Amount Accumulated Carrying Amount (Dollars in thousands) Foster Bankshares acquisition 10 years $ 2,763 $ (2,763) $ — $ (2,763) $ — Wilshire Bancorp acquisition 10 years 18,138 (14,604) 3,534 (14,203) 3,935 Total $ 20,901 $ (17,367) $ 3,534 $ (16,966) $ 3,935
Schedule of Servicing Assets	The changes in servicing assets for the three months ended March 31, 2024 and 2023, were as follows: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Balance at beginning of period $ 9,631 $ 11,628 Additions through originations of servicing assets 7 965 Amortization (769) (965) Balance at end of period $ 8,869 $ 11,628
Summary of Fair Value Inputs	The inputs used in evaluating servicing assets for impairment at March 31, 2024 and December 31, 2023, are presented below. March 31, 2024 December 31, 2023 SBA Servicing Assets: Weighted-average discount rate 9.82% 11.12% Constant prepayment rate 12.22% 12.17% Mortgage Servicing Assets: Weighted-average discount rate 11.13% 11.00% Constant prepayment rate 4.99% 9.52%

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2024
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 March 31, 2024 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Investment securities AFS: U.S. Treasury securities $ 3,990 $ 3,990 $ — $ — U.S. Government agency and U.S. Government sponsored enterprises: Agency securities 3,893 — 3,893 — Collateralized mortgage obligations 731,193 — 731,193 — Mortgage-backed securities: Residential 404,353 — 404,353 — Commercial 403,092 — 403,092 — Asset-backed securities 139,512 — 139,512 — Corporate securities 19,407 — 19,407 — Municipal securities 310,949 — 310,130 819 Equity investments with readily determinable fair value 4,317 4,317 — — Interest rate contracts 62,351 — 62,351 — Mortgage banking derivatives 7 — 7 — Other derivatives 409 — 409 — Liabilities: Interest rate contracts 63,903 — 63,903 — Mortgage banking derivatives 6 — 6 — Other derivatives 11,310 — 11,297 13 Fair Value Measurements at the End of December 31, 2023 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Investment securities AFS: U.S. Treasury securities $ 103,677 $ 103,677 $ — $ — U.S. Government agency and U.S. Government sponsored enterprises: Agency securities 3,900 — 3,900 — Collateralized mortgage obligations 747,719 — 747,719 — Mortgage-backed securities: Residential 420,298 — 420,298 — Commercial 391,888 — 391,888 — Asset-backed securities 149,670 — 149,670 — Corporate securities 19,434 — 19,434 — Municipal securities 308,473 — 307,615 858 Equity investments with readily determinable fair value 4,363 4,363 — — Interest rate contracts 54,302 — 54,302 — Mortgage banking derivatives 7 — 7 — Other derivatives 11,021 — 11,021 — Liabilities: Interest rate contracts 55,622 — 55,622 — Mortgage banking derivatives 17 — 17 — Other derivatives 1,379 — 1,351 28
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The table below presents a reconciliation and income statement classification of gains (losses) for the municipal security and risk participation agreements measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended March 31, 2024 and 2023: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Municipal securities: Beginning Balance $ 858 $ 943 Change in fair value included in other comprehensive income (39) 39 Ending Balance $ 819 $ 982 Risk participation agreements: Beginning Balance $ 28 $ 32 Change in fair value included in income (15) 3 Ending Balance $ 13 $ 35
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 March 31, 2024 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Collateral-dependent loans receivable at fair value: CRE loans $ 5,095 $ — $ — $ 5,095 C&I loans 13,924 — — 13,924 Fair Value Measurements at the End of December 31, 2023 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (Dollars in thousands) Assets: Collateral-dependent loans receivable at fair value: CRE loans $ 3,475 $ — $ — $ 3,475 C&I loans 2,701 — — 2,701 Loans held for sale, net 2,287 — 2,287 — OREO 63 — — 63 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: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Assets: Collateral-dependent loans receivable at fair value: CRE loans $ (477) $ (166) C&I loans (4,341) (2,794) OREO — (271)
Carrying Amounts and Estimated Fair Values of Financial Instruments	Carrying amounts and estimated fair values of financial instruments, not previously presented, at March 31, 2024 and December 31, 2023, were as follows: March 31, 2024 Carrying Amount Estimated Fair Value Fair Value Measurement (Dollars in thousands) Financial Assets: Cash and cash equivalents $ 1,185,296 $ 1,185,296 Level 1 Investment securities HTM 261,601 242,717 Level 2 Equity investments without readily determinable fair values 39,608 39,608 Level 2 Loans held for sale 2,763 2,768 Level 2 Loans receivable, net 13,560,420 13,162,050 Level 3 Accrued interest receivable 60,316 60,316 Level 2/3 Servicing assets, net 8,869 15,288 Level 3 Customers’ liabilities on acceptances 780 780 Level 2 Financial Liabilities: Noninterest bearing deposits $ 3,652,592 $ 3,652,592 Level 2 Money market, interest bearing demand and savings deposits 5,313,064 5,313,064 Level 2 Time deposits 5,787,761 5,793,249 Level 2 FHLB and FRB borrowings 795,634 797,206 Level 2 Convertible notes 444 434 Level 1 Subordinated debentures 108,148 97,376 Level 3 Accrued interest payable 122,467 122,467 Level 2 Acceptances outstanding 780 780 Level 2 December 31, 2023 Carrying Amount Estimated Fair Value Fair Value Measurement (Dollars in thousands) Financial Assets: Cash and cash equivalents $ 1,928,967 $ 1,928,967 Level 1 Investment securities HTM 263,912 250,518 Level 2 Equity investments without readily determinable fair values 39,387 39,387 Level 2 Loans held for sale 3,408 3,419 Level 2 Loans receivable, net 13,694,925 13,270,444 Level 3 Accrued interest receivable 61,720 61,720 Level 2/3 Servicing assets, net 9,631 14,853 Level 3 Customers’ liabilities on acceptances 471 471 Level 2 Financial Liabilities: Noninterest bearing deposits $ 3,914,967 $ 3,914,967 Level 2 Money market, interest bearing demand and savings deposits 4,872,029 4,872,029 Level 2 Time deposits 5,966,757 5,974,125 Level 2 FHLB and FRB borrowings 1,795,726 1,795,820 Level 2 Convertible notes, net 444 451 Level 1 Subordinated debentures 107,825 99,358 Level 3 Accrued interest payable 168,174 168,174 Level 2 Acceptances outstanding 471 471 Level 2

Stockholders_ Equity (Tables)

Stockholders’ Equity (Tables)	3 Months Ended
	Mar. 31, 2024
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table presents the changes to accumulated other comprehensive loss for the three months ended March 31, 2024 and 2023: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Balance at beginning of period $ (204,738) $ (230,857) Unrealized net (losses) gains on securities available for sale (13,734) 31,215 Unrealized net losses on interest rate contracts used for cash flow hedges (8,186) (5,938) Reclassification adjustments for net gains realized in net income (2,931) (1,738) Tax effect 7,311 (6,939) Other comprehensive (loss) income, net of tax (17,540) 16,600 Balance at end of period $ (222,278) $ (214,257)

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2024
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 three months ended March 31, 2024: Number of Shares Weighted-Average Exercise Price Per Share Weighted-Average Aggregate Intrinsic Value (Dollars in thousands) Outstanding - January 1, 2024 629,367 $ 16.61 Granted — — Exercised — — Expired (28,136) 15.23 Forfeited — — Outstanding - March 31, 2024 601,231 $ 16.68 1.74 $ — Options exercisable - March 31, 2024 601,231 $ 16.68 1.74 $ —
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 three months ended March 31, 2024: Number of Shares Weighted-Average Grant Date Fair Value Outstanding (unvested) - January 1, 2024 2,043,621 $ 12.09 Granted 34,634 15.49 Vested (771,422) 12.82 Forfeited (70,622) 15.04 Outstanding (unvested) - March 31, 2024 1,236,211 $ 11.56

Regulatory Matters (Tables)

Regulatory Matters (Tables)	3 Months Ended
	Mar. 31, 2024
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 Ratio Required for Capital Adequacy Purposes Ratio Required To Be Well-Capitalized Ratio Required for Minimum Capital Adequacy With Capital Conservation Buffer March 31, 2024 Amount Ratio (Dollars in thousands) Common equity Tier 1 capital Company $ 1,872,360 12.47 % 4.50 % N/A 7.00 % Bank $ 1,948,503 12.99 % 4.50 % 6.50 % 7.00 % Tier 1 capital Company $ 1,976,607 13.17 % 6.00 % N/A 8.50 % Bank $ 1,948,503 12.99 % 6.00 % 8.00 % 8.50 % Total capital Company $ 2,130,033 14.19 % 8.00 % N/A 10.50 % Bank $ 2,101,929 14.01 % 8.00 % 10.00 % 10.50 % Leverage capital Company $ 1,976,607 10.42 % 4.00 % N/A N/A Bank $ 1,948,503 10.27 % 4.00 % 5.00 % N/A Actual Ratio Required for Capital Adequacy Purposes Ratio Required To Be Well-Capitalized Ratio Required for Minimum Capital Adequacy With Capital Conservation Buffer December 31, 2023 Amount Ratio (Dollars in thousands) Common equity Tier 1 capital Company $ 1,869,774 12.28 % 4.50 % N/A 7.00 % Bank $ 1,940,303 12.75 % 4.50 % 6.50 % 7.00 % Tier 1 capital Company $ 1,973,698 12.96 % 6.00 % N/A 8.50 % Bank $ 1,940,303 12.75 % 6.00 % 8.00 % 8.50 % Total capital Company $ 2,120,157 13.92 % 8.00 % N/A 10.50 % Bank $ 2,086,762 13.71 % 8.00 % 10.00 % 10.50 % Leverage capital Company $ 1,973,698 10.11 % 4.00 % N/A N/A Bank $ 1,940,303 9.94 % 4.00 % 5.00 % N/A

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	Service charges on deposit accounts and wire transfers are summarized below: Three Months Ended March 31, 2024 2023 (Dollars in thousands) Noninterest bearing deposit account income: Monthly service charges $ 244 $ 245 Customer analysis charges 1,423 1,126 NSF charges 814 735 Other service charges 79 91 Total noninterest bearing deposit account income 2,560 2,197 Interest bearing deposit account income: Monthly service charges 27 24 Total service fees on deposit accounts $ 2,587 $ 2,221 Wire transfer fee income: Wire transfer fees $ 263 $ 406 Foreign exchange fees 549 367 Total wire transfer fees $ 812 $ 773

Hope Bancorp, Inc. (Details)

Hope Bancorp, Inc. (Details)	Mar. 31, 2024 branch office	Mar. 28, 2024 branch
Business Acquisition [Line Items]
Entity number of Branches	48
Number of loan production offices | office	9
PromiseOne Bank
Business Acquisition [Line Items]
Entity number of Branches		2

Basis of Presentation (Details)

Basis of Presentation (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Jan. 01, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 1,159,593	$ 1,150,547
ASU 2022-02 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings			$ 287

Earnings Per Share (Details)

Earnings Per Share (Details)		3 Months Ended
	Jun. 07, 2018	Mar. 31, 2024 USD ($) $ / shares shares	Mar. 31, 2023 USD ($) $ / shares shares	Jun. 06, 2018 USD ($)
Net Income (Numerator)
Basic EPS - common stock | $		$ 25,864,000	$ 39,121,000
Diluted EPS - common stock | $		$ 25,864,000	$ 39,121,000
Weighted-Average Shares (Denominator)
Basic EPS - common stock (in shares)		120,187,300	119,551,247
Effect of dilutive securities:
Stock options, restricted stock, and ESPP shares (in shares)		832,992	691,048
Diluted EPS - common stock (shares)		121,020,292	120,242,295
Earnings Per Share
Basic EPS - common stock (in dollars per share) | $ / shares		$ 0.22	$ 0.33
Diluted EPS - common stock (in dollars per share) | $ / shares		$ 0.21	$ 0.33
Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Aggregate principal amount issued | $		$ 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		642,245	705,659

Equity Investments - Narrative

Equity Investments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Net Investment Income [Line Items]
Equity investments with readily determinable fair value	$ 43,925		$ 43,750
Realized gain (loss) recorded on equity investments sold	0	$ 0
Equity investments without readily determinable fair values	39,600		39,387
Equity investments without readily determinable fair values, impairment	0	$ 0
Mutual funds
Net Investment Income [Line Items]
Equity investments with readily determinable fair value	4,300		4,400
Correspondent bank stock
Net Investment Income [Line Items]
Equity investments without readily determinable fair values	370		370
CDFI investments
Net Investment Income [Line Items]
Equity investments without readily determinable fair values	1,000		1,000
CRA investments
Net Investment Income [Line Items]
Equity investments without readily determinable fair values	$ 38,200		$ 38,000

Equity Investments - Change in

Equity Investments - Change in Fair Value of Equity Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Net change in fair value recorded during the period on equity investments with readily determinable fair value	$ (46)	$ 69
Less: Net change in fair value recorded on equity investments sold during the period	0	0
Net change in fair value on equity investments with readily determinable fair values held at the end of the period	$ (46)	$ 69

Securities Available for Sale -

Securities Available for Sale - Summary of Securities Available for Sale (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Jun. 30, 2023	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,314,872,000			$ 2,429,808,000
Gross Unrealized Gains	4,828,000			6,199,000
Gross Unrealized Losses	(303,311,000)			(290,948,000)
Fair Value	2,016,389,000			2,145,059,000
Amortized Cost	261,601,000			263,912,000
Gross Unrealized Gains	0			0
Gross Unrealized Losses	18,884,000			13,394,000
Fair Value	242,717,000			250,518,000
Accrued interest receivable for investment securities available for sale	9,100,000			11,000,000
Unrealized gains on securities available for sale net of taxes	(222,278,000)			(204,738,000)
Net gains on sales of securities available for sale	0	$ 0
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Unrealized gains on securities available for sale net of taxes	(209,900,000)			(200,200,000)
US Treasury Notes Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,999,000			103,691,000
Gross Unrealized Gains	0			21,000
Gross Unrealized Losses	(9,000)			(35,000)
Fair Value	3,990,000			103,677,000
Agency Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,000,000			4,000,000
Gross Unrealized Gains	0			0
Gross Unrealized Losses	(107,000)			(100,000)
Fair Value	3,893,000			3,900,000
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	876,038,000			888,631,000
Gross Unrealized Gains	403,000			367,000
Gross Unrealized Losses	(145,248,000)			(141,279,000)
Fair Value	731,193,000			747,719,000
Mortgage-backed securities: Residential
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	490,009,000			499,431,000
Gross Unrealized Gains	0			0
Gross Unrealized Losses	(85,656,000)			(79,133,000)
Fair Value	404,353,000			420,298,000
Amortized Cost	148,784,000			150,369,000
Gross Unrealized Gains	0			0
Gross Unrealized Losses	10,646,000			6,663,000
Fair Value	138,138,000			143,706,000
Mortgage-backed securities: Commercial
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	458,834,000			445,207,000
Gross Unrealized Gains	21,000			113,000
Gross Unrealized Losses	(55,763,000)			(53,432,000)
Fair Value	403,092,000			391,888,000
Amortized Cost	112,817,000			113,543,000
Gross Unrealized Gains	0			0
Gross Unrealized Losses	8,238,000			6,731,000
Fair Value	104,579,000			106,812,000
Asset-backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	139,300,000			150,992,000
Gross Unrealized Gains	270,000			0
Gross Unrealized Losses	(58,000)			(1,322,000)
Fair Value	139,512,000			149,670,000
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,290,000			23,302,000
Gross Unrealized Gains	0			0
Gross Unrealized Losses	(3,883,000)			(3,868,000)
Fair Value	19,407,000			19,434,000
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	319,402,000			314,554,000
Gross Unrealized Gains	4,134,000			5,698,000
Gross Unrealized Losses	(12,587,000)			(11,779,000)
Fair Value	$ 310,949,000			$ 308,473,000
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%		10%

Securities Available for Sale_2

Securities Available for Sale - Interest Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Debt Securities, Available-for-Sale [Abstract]
Taxable	$ 16,982	$ 14,046
Nontaxable	1,067	1,079
Total	$ 18,049	$ 15,125

Securities Available for Sale_3

Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Due within one year	$ 3,999
Due after one year through five years	155,732
Due after five years through ten years	95,794
Due after ten years	2,059,347
Amortized Cost	2,314,872	$ 2,429,808
Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract]
Due within one year	3,990
Due after one year through five years	146,039
Due after five years through ten years	85,941
Due after ten years	1,780,419
Total	2,016,389	2,145,059
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity [Abstract]
Due within one year	0
Due after one year through five years	25,116
Due after five years through ten years	8,679
Due after ten years	227,806
Total	261,601
Debt Securities, Held-to-Maturity, Fair Value, Maturity [Abstract]
Due within one year	0
Due after one year through five years	24,232
Due after five years through ten years	8,256
Due after ten years	210,229
Total	242,717
Securities, carrying value	$ 815,300	$ 1,700,000

Securities Available for Sale_4

Securities Available for Sale - Aggregate Unrealized Losses and Fair Value (Details) $ in Thousands	Mar. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Number  of Securities
Less than 12 months | security	32	20
12 months or longer | security	285	301
Total | security	317	321
Fair  Value
Less than 12 months	$ 163,962	$ 115,815
12 months or longer	1,570,860	1,738,084
Total	1,734,822	1,853,899
Gross Unrealized Losses
Less than 12 months	(3,217)	(2,770)
12 months or longer	(300,094)	(288,178)
Total	$ (303,311)	$ (290,948)
Collateralized mortgage obligations
Number  of Securities
Less than 12 months | security	1	3
12 months or longer | security	115	115
Total | security	116	118
Fair  Value
Less than 12 months	$ 5,510	$ 19,800
12 months or longer	700,005	717,662
Total	705,515	737,462
Gross Unrealized Losses
Less than 12 months	(229)	(378)
12 months or longer	(145,019)	(140,901)
Total	$ (145,248)	$ (141,279)
Mortgage-backed securities: Residential
Number  of Securities
Less than 12 months | security	1	0
12 months or longer | security	64	65
Total | security	65	65
Fair  Value
Less than 12 months	$ 2,591	$ 0
12 months or longer	401,762	420,298
Total	404,353	420,298
Gross Unrealized Losses
Less than 12 months	(164)	0
12 months or longer	(85,492)	(79,133)
Total	$ (85,656)	$ (79,133)
Mortgage-backed securities: Commercial
Number  of Securities
Less than 12 months | security	12	6
12 months or longer | security	53	53
Total | security	65	59
Fair  Value
Less than 12 months	$ 77,736	$ 53,255
12 months or longer	323,928	331,450
Total	401,664	384,705
Gross Unrealized Losses
Less than 12 months	(2,308)	(2,129)
12 months or longer	(53,455)	(51,303)
Total	$ (55,763)	$ (53,432)
Corporate securities
Number  of Securities
Less than 12 months | security	0	0
12 months or longer | security	6	6
Total | security	6	6
Fair  Value
Less than 12 months	$ 0	$ 0
12 months or longer	19,407	19,434
Total	19,407	19,434
Gross Unrealized Losses
Less than 12 months	0	0
12 months or longer	(3,883)	(3,868)
Total	$ (3,883)	$ (3,868)
Municipal securities
Number  of Securities
Less than 12 months | security	16	11
12 months or longer | security	42	42
Total | security	58	53
Fair  Value
Less than 12 months	$ 63,375	$ 42,760
12 months or longer	90,383	91,707
Total	153,758	134,467
Gross Unrealized Losses
Less than 12 months	(516)	(263)
12 months or longer	(12,071)	(11,516)
Total	$ (12,587)	$ (11,779)
U.S. Government Agency and U.S. Government Sponsored Enterprises
Gross Unrealized Losses
Percentage of portfolio	79.40%
Asset-backed Securities
Number  of Securities
Less than 12 months | security	2	0
12 months or longer | security	3	18
Total | security	5	18
Fair  Value
Less than 12 months	$ 14,750	$ 0
12 months or longer	27,492	149,670
Total	42,242	149,670
Gross Unrealized Losses
Less than 12 months	0	0
12 months or longer	(58)	(1,322)
Total	$ (58)	$ (1,322)
US Treasury Notes Securities
Number  of Securities
Less than 12 months | security	0	0
12 months or longer | security	1	1
Total | security	1	1
Fair  Value
Less than 12 months	$ 0	$ 0
12 months or longer	3,990	3,963
Total	3,990	3,963
Gross Unrealized Losses
Less than 12 months	0	0
12 months or longer	(9)	(35)
Total	$ (9)	$ (35)
Agency Securities
Number  of Securities
Less than 12 months | security	0	0
12 months or longer | security	1	1
Total | security	1	1
Fair  Value
Less than 12 months	$ 0	$ 0
12 months or longer	3,893	3,900
Total	3,893	3,900
Gross Unrealized Losses
Less than 12 months	0	0
12 months or longer	(107)	(100)
Total	$ (107)	$ (100)

Held to Maturity (Details)

Held to Maturity (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	$ 0	$ 0

Loans Receivable and Allowanc_3

Loans Receivable and Allowance for Credit Losses - Schedule of Loans Receivable By Major Category (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) segment	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, net of deferred costs and fees	$ 13,719,178	$ 13,853,619
Total	(158,758)	(158,694)	$ (163,544)	$ (162,359)
Loans receivable, net of allowance for credit losses	13,560,420	13,694,925
Net deferred fees/costs	$ 4,900	6,100
Number of portfolio segments | segment	4
Increase (Decrease) in Finance Receivables	$ (134,400)
Increase (decrease) in financing receivable, percentage	(1.00%)
Threshold period for loans to be placed on nonaccrual status	90 days
CRE loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, net of deferred costs and fees	$ 8,707,673	8,797,884
Total	(90,823)	(93,940)	(108,835)	(95,884)
C&I loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, net of deferred costs and fees	4,041,063	4,135,044
Total	(55,465)	(51,291)	(42,790)	(56,872)
Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, net of deferred costs and fees	936,035	883,687
Total	(11,942)	(12,838)	(11,253)	(8,920)
Consumer and other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable, net of deferred costs and fees	34,407	37,004
Total	$ (528)	$ (625)	$ (666)	$ (683)

Loans Receivable and Allowanc_4

Loans Receivable and Allowance for Credit Losses - Allowance for Credit Losses on Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	$ 158,694	$ 162,359	$ 162,359
Provision (credit) for credit/loan losses	3,600	1,700
Loans charged off	(4,720)	(495)	(37,520)
Recoveries of charge offs	1,184	387
Balance, end of period	158,758	163,544	158,694
Allowance for credit losses:
Individually evaluated	5,637		2,660
Collectively evaluated	153,121		156,034
Total	158,758	163,544	158,694
Loans outstanding:
Individually evaluated	106,575		45,204
Collectively evaluated	13,612,603		13,808,415
Total	13,719,178		13,853,619
Reserve for unfunded loan commitments recorded in other liabilities	2,800		3,800
Additions to reserves for unfunded loan commitments recorded in credit related expenses	$ (1,000)	1,620
Threshold period for loans to be placed on nonaccrual status	90 days
Non-modeled loans as percentage of total loan portfolio (less than)	2%
Reasonable and supportable period at which point loss assumptions revert back to historical loss information	2 years
ASU 2022-02
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	$ (407)
Balance, end of period			(407)
Allowance for credit losses:
Total			(407)
Real estate
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	93,940	95,884	95,884
Provision (credit) for credit/loan losses	(3,614)	12,863
Loans charged off	(38)	0	(2,947)
Recoveries of charge offs	535	69
Balance, end of period	90,823	108,835	93,940
Allowance for credit losses:
Individually evaluated	1,142		886
Collectively evaluated	89,681		93,054
Total	90,823	108,835	93,940
Loans outstanding:
Individually evaluated	84,885		33,932
Collectively evaluated	8,622,788		8,763,952
Total	8,707,673		8,797,884
Real estate | ASU 2022-02
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	19
Balance, end of period			19
Allowance for credit losses:
Total			19
C&I loans
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	51,291	56,872	56,872
Provision (credit) for credit/loan losses	8,246	(13,500)
Loans charged off	(4,619)	(440)	(34,203)
Recoveries of charge offs	547	284
Balance, end of period	55,465	42,790	51,291
Allowance for credit losses:
Individually evaluated	4,466		1,721
Collectively evaluated	50,999		49,570
Total	55,465	42,790	51,291
Loans outstanding:
Individually evaluated	15,071		5,013
Collectively evaluated	4,025,992		4,130,031
Total	4,041,063		4,135,044
C&I loans | ASU 2022-02
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	(426)
Balance, end of period			(426)
Allowance for credit losses:
Total			(426)
Residential mortgage loans
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	12,838	8,920	8,920
Provision (credit) for credit/loan losses	(896)	2,333
Loans charged off	0	0	0
Recoveries of charge offs	0	0
Balance, end of period	11,942	11,253	12,838
Allowance for credit losses:
Individually evaluated	26		39
Collectively evaluated	11,916		12,799
Total	11,942	11,253	12,838
Loans outstanding:
Individually evaluated	6,343		5,916
Collectively evaluated	929,692		877,771
Total	936,035		883,687
Residential mortgage loans | ASU 2022-02
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	0
Balance, end of period			0
Allowance for credit losses:
Total			0
Consumer and other loans
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	625	683	683
Provision (credit) for credit/loan losses	(136)	4
Loans charged off	(63)	(55)	(370)
Recoveries of charge offs	102	34
Balance, end of period	528	666	625
Allowance for credit losses:
Individually evaluated	3		14
Collectively evaluated	525		611
Total	528	$ 666	625
Loans outstanding:
Individually evaluated	276		343
Collectively evaluated	34,131		36,661
Total	34,407		37,004
Consumer and other loans | ASU 2022-02
Allowance for Loan Losses by Portfolio Segment
Balance, beginning of period	$ 0
Balance, end of period			0
Allowance for credit losses:
Total			$ 0

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	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
Threshold period for loans to be placed on nonaccrual status	90 days
Nonaccrual with No ACL	$ 30,457	$ 32,173
Nonaccrual with an ACL	29,069	13,031
Financing Receivable, Nonaccrual	59,526	45,204
Accruing Loans Past Due 90 Days or More	47,290	261
Guaranteed portion of SBA loans excluded from Nonaccrual loans	10,900	11,400
CRE loans
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No ACL	27,273		$ 26,724
Nonaccrual with an ACL	10,563		7,208
Financing Receivable, Nonaccrual	37,836	33,932
Accruing Loans Past Due 90 Days or More	47,049		$ 0
C&I loans
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No ACL	194	2,447
Nonaccrual with an ACL	14,876	2,566
Financing Receivable, Nonaccrual	15,070	5,013
Accruing Loans Past Due 90 Days or More	185	184
Residential mortgage loans
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No ACL	2,990	3,002
Nonaccrual with an ACL	3,354	2,914
Financing Receivable, Nonaccrual	6,344	5,916
Accruing Loans Past Due 90 Days or More	0	0
Consumer
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No ACL	0	0
Nonaccrual with an ACL	276	343
Financing Receivable, Nonaccrual	276	343
Accruing Loans Past Due 90 Days or More	$ 56	$ 77

Loans Receivable and Allowanc_6

Loans Receivable and Allowance for Credit Losses - Collateral-Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 158,758	$ 158,694	$ 163,544	$ 162,359
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	38,673	36,960
Real Estate Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	34,979	35,252
Other Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,694	1,708
Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	90,823	93,940	108,835	95,884
Real estate | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	31,795	29,803
Real estate | Real Estate Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	31,795	29,803
Real estate | Other Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
C&I loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	55,465	51,291	42,790	56,872
C&I loans | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,888	4,155
C&I loans | Real Estate Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	194	2,447
C&I loans | Other Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,694	1,708
Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	11,942	12,838	11,253	8,920
Residential mortgage loans | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,990	3,002
Residential mortgage loans | Real Estate Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,990	3,002
Residential mortgage loans | Other Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Consumer and other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	528	625	$ 666	$ 683
Consumer and other loans | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Consumer and other loans | Real Estate Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Consumer and other loans | Other Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 0	$ 0

Loans Receivable and Allowanc_7

Loans Receivable and Allowance for Credit Losses - Interest Income Reversals (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income reversals	$ 785	$ 983
Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income reversals	191	451
C&I loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income reversals	588	518
Residential mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income reversals	$ 6	$ 14

Loans Receivable and Allowanc_8

Loans Receivable and Allowance for Credit Losses - Past Due Financing Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	$ 13,719,178	$ 13,853,619
Total Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	70,626	22,568
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	3,629	4,681
60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	2,727	3,557
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	64,270	14,330
Real estate
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	8,707,673	8,797,884
Real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	66,220	15,172
Real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	2,814	1,999
Real estate | 60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	1,764	2,976
Real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	61,642	10,197
C&I loans
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	4,041,063	4,135,044
C&I loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	1,458	3,184
C&I loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	483	934
C&I loans | 60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	349	533
C&I loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	626	1,717
Residential mortgage loans
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	936,035	883,687
Residential mortgage loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	2,486	3,873
Residential mortgage loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	0	1,534
Residential mortgage loans | 60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	540	0
Residential mortgage loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	1,946	2,339
Consumer and other loans
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	34,407	37,004
Consumer and other loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	462	339
Consumer and other loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	332	214
Consumer and other loans | 60-89 Days  Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	74	48
Consumer and other loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, past due loans	$ 56	$ 77

Loans Receivable and Allowanc_9

Loans Receivable and Allowance for Credit Losses - Financing Receivable Credit Quality Indicators (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	$ 717,999,000		$ 1,845,145,000
Term loan originated in year two	1,551,888,000		4,084,313,000
Term loan originated in year three	3,934,770,000		3,056,873,000
Term loan originated in year four	2,943,173,000		1,470,519,000
Term loan originated in year five	1,425,839,000		1,212,639,000
Term loan originated prior to year five	2,508,655,000		1,543,568,000
Revolving Loans	636,854,000		640,562,000
Total	13,719,178,000		13,853,619,000
Current period gross charge offs, Year One, Originated, Current Fiscal Year	0		5,114,000
Current period gross charge offs, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		12,638,000
Current period gross charge offs, Year Three, Originated, Two Years before Current Fiscal Year	4,569,000		16,020,000
Current period gross charge offs, Year Four, Originated, Three Years before Current Fiscal Year	29,000		361,000
Current period gross charge offs, Year Five, Originated, Four Years before Current Fiscal Year	0		537,000
Current period gross charge offs, Originated, More than Five Years before Current Fiscal Year	59,000		2,480,000
Current period gross charge offs, Revolving	63,000		370,000
Allowance for credit loss, writeoff	4,720,000	$ 495,000	37,520,000
Revolving loans converted to term loans	0		0
CRE loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	171,109,000		623,058,000
Term loan originated in year two	613,981,000		2,432,696,000
Term loan originated in year three	2,399,914,000		2,068,615,000
Term loan originated in year four	2,043,951,000		1,244,883,000
Term loan originated in year five	1,224,820,000		1,004,529,000
Term loan originated prior to year five	2,177,172,000		1,344,677,000
Revolving Loans	76,726,000		79,426,000
Total	8,707,673,000		8,797,884,000
Current period gross charge offs, Year One, Originated, Current Fiscal Year	0		103,000
Current period gross charge offs, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		315,000
Current period gross charge offs, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Current period gross charge offs, Year Four, Originated, Three Years before Current Fiscal Year	0		233,000
Current period gross charge offs, Year Five, Originated, Four Years before Current Fiscal Year	0		355,000
Current period gross charge offs, Originated, More than Five Years before Current Fiscal Year	38,000		1,941,000
Current period gross charge offs, Revolving	0		0
Allowance for credit loss, writeoff	38,000	0	2,947,000
C&I loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	473,630,000		1,124,120,000
Term loan originated in year two	844,515,000		1,285,421,000
Term loan originated in year three	1,173,653,000		723,689,000
Term loan originated in year four	638,355,000		220,376,000
Term loan originated in year five	196,048,000		177,719,000
Term loan originated prior to year five	172,998,000		63,377,000
Revolving Loans	541,864,000		540,342,000
Total	4,041,063,000		4,135,044,000
Current period gross charge offs, Year One, Originated, Current Fiscal Year	0		5,011,000
Current period gross charge offs, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		12,323,000
Current period gross charge offs, Year Three, Originated, Two Years before Current Fiscal Year	4,569,000		16,020,000
Current period gross charge offs, Year Four, Originated, Three Years before Current Fiscal Year	29,000		128,000
Current period gross charge offs, Year Five, Originated, Four Years before Current Fiscal Year	0		182,000
Current period gross charge offs, Originated, More than Five Years before Current Fiscal Year	21,000		539,000
Current period gross charge offs, Revolving	0		0
Allowance for credit loss, writeoff	4,619,000	440,000	34,203,000
Residential mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	69,478,000		93,982,000
Term loan originated in year two	92,651,000		365,252,000
Term loan originated in year three	360,664,000		264,291,000
Term loan originated in year four	260,618,000		3,192,000
Term loan originated in year five	3,183,000		30,020,000
Term loan originated prior to year five	149,441,000		126,950,000
Revolving Loans	0		0
Total	936,035,000		883,687,000
Current period gross charge offs, Year One, Originated, Current Fiscal Year	0		0
Current period gross charge offs, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Current period gross charge offs, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Current period gross charge offs, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Current period gross charge offs, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Current period gross charge offs, Originated, More than Five Years before Current Fiscal Year	0		0
Current period gross charge offs, Revolving	0		0
Allowance for credit loss, writeoff	0	0	0
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	3,782,000		3,985,000
Term loan originated in year two	741,000		944,000
Term loan originated in year three	539,000		278,000
Term loan originated in year four	249,000		2,068,000
Term loan originated in year five	1,788,000		371,000
Term loan originated prior to year five	9,044,000		8,564,000
Revolving Loans	18,264,000		20,794,000
Total	34,407,000		37,004,000
Current period gross charge offs, Year One, Originated, Current Fiscal Year	0		0
Current period gross charge offs, Year Two, Originated, Fiscal Year before Current Fiscal Year	0		0
Current period gross charge offs, Year Three, Originated, Two Years before Current Fiscal Year	0		0
Current period gross charge offs, Year Four, Originated, Three Years before Current Fiscal Year	0		0
Current period gross charge offs, Year Five, Originated, Four Years before Current Fiscal Year	0		0
Current period gross charge offs, Originated, More than Five Years before Current Fiscal Year	0		0
Current period gross charge offs, Revolving	63,000		370,000
Allowance for credit loss, writeoff	63,000	$ 55,000	370,000
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	699,099,000		1,828,244,000
Term loan originated in year two	1,505,585,000		4,004,137,000
Term loan originated in year three	3,847,429,000		2,993,939,000
Term loan originated in year four	2,860,214,000		1,446,220,000
Term loan originated in year five	1,379,679,000		1,188,732,000
Term loan originated prior to year five	2,426,675,000		1,490,420,000
Revolving Loans	578,964,000		579,486,000
Total	13,297,645,000		13,531,178,000
Pass | CRE loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	171,109,000		623,058,000
Term loan originated in year two	598,990,000		2,429,146,000
Term loan originated in year three	2,398,974,000		2,045,863,000
Term loan originated in year four	1,998,868,000		1,239,654,000
Term loan originated in year five	1,188,980,000		996,483,000
Term loan originated prior to year five	2,115,568,000		1,297,295,000
Revolving Loans	76,726,000		79,426,000
Total	8,549,215,000		8,710,925,000
Pass | C&I loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	454,730,000		1,107,219,000
Term loan originated in year two	813,203,000		1,208,795,000
Term loan originated in year three	1,087,252,000		683,821,000
Term loan originated in year four	601,332,000		203,142,000
Term loan originated in year five	187,564,000		162,815,000
Term loan originated prior to year five	156,808,000		61,019,000
Revolving Loans	483,974,000		479,266,000
Total	3,784,863,000		3,906,077,000
Pass | Residential mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	69,478,000		93,982,000
Term loan originated in year two	92,651,000		365,252,000
Term loan originated in year three	360,664,000		263,977,000
Term loan originated in year four	259,765,000		1,356,000
Term loan originated in year five	1,347,000		29,063,000
Term loan originated prior to year five	145,531,000		123,885,000
Revolving Loans	0		0
Total	929,436,000		877,515,000
Pass | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	3,782,000		3,985,000
Term loan originated in year two	741,000		944,000
Term loan originated in year three	539,000		278,000
Term loan originated in year four	249,000		2,068,000
Term loan originated in year five	1,788,000		371,000
Term loan originated prior to year five	8,768,000		8,221,000
Revolving Loans	18,264,000		20,794,000
Total	34,131,000		36,661,000
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	8,760,000		9,743,000
Term loan originated in year two	38,824,000		25,414,000
Term loan originated in year three	30,931,000		46,840,000
Term loan originated in year four	47,683,000		11,115,000
Term loan originated in year five	3,319,000		20,577,000
Term loan originated prior to year five	28,368,000		5,196,000
Revolving Loans	57,298,000		60,107,000
Total	215,183,000		178,992,000
Special mention | CRE loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0		0
Term loan originated in year two	14,991,000		2,001,000
Term loan originated in year three	0		15,452,000
Term loan originated in year four	18,984,000		2,518,000
Term loan originated in year five	3,319,000		5,963,000
Term loan originated prior to year five	13,774,000		5,196,000
Revolving Loans	0		0
Total	51,068,000		31,130,000
Special mention | C&I loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	8,760,000		9,743,000
Term loan originated in year two	23,833,000		23,413,000
Term loan originated in year three	30,931,000		31,388,000
Term loan originated in year four	28,699,000		8,597,000
Term loan originated in year five	0		14,614,000
Term loan originated prior to year five	14,594,000		0
Revolving Loans	57,298,000		60,107,000
Total	164,115,000		147,862,000
Special mention | Residential mortgage 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	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		0
Term loan originated in year five	0		0
Term loan originated prior to year five	0		0
Revolving Loans	0		0
Total	0		0
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	10,140,000		7,158,000
Term loan originated in year two	7,479,000		54,762,000
Term loan originated in year three	56,410,000		16,094,000
Term loan originated in year four	35,276,000		13,184,000
Term loan originated in year five	42,841,000		3,330,000
Term loan originated prior to year five	53,612,000		47,952,000
Revolving Loans	592,000		969,000
Total	206,350,000		143,449,000
Substandard | CRE loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	0		0
Term loan originated in year two	0		1,549,000
Term loan originated in year three	940,000		7,300,000
Term loan originated in year four	26,099,000		2,711,000
Term loan originated in year five	32,521,000		2,083,000
Term loan originated prior to year five	47,830,000		42,186,000
Revolving Loans	0		0
Total	107,390,000		55,829,000
Substandard | C&I loans
Financing Receivable, Credit Quality Indicator [Line Items]
Term loan originated in year one	10,140,000		7,158,000
Term loan originated in year two	7,479,000		53,213,000
Term loan originated in year three	55,470,000		8,480,000
Term loan originated in year four	8,324,000		8,637,000
Term loan originated in year five	8,484,000		290,000
Term loan originated prior to year five	1,596,000		2,358,000
Revolving Loans	592,000		969,000
Total	92,085,000		81,105,000
Substandard | Residential mortgage 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		314,000
Term loan originated in year four	853,000		1,836,000
Term loan originated in year five	1,836,000		957,000
Term loan originated prior to year five	3,910,000		3,065,000
Revolving Loans	0		0
Total	6,599,000		6,172,000
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		0
Term loan originated prior to year five	276,000		343,000
Revolving Loans	0		0
Total	$ 276,000		$ 343,000

Loans Receivable and Allowan_10

Loans Receivable and Allowance for Credit Losses - Loans Held For Investment - Reclassification to Held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfer of loans held for investment to held for sale	$ 0	$ 162,483
CRE loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfer of loans held for investment to held for sale	0	53,608
C&I loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfer of loans held for investment to held for sale	$ 0	$ 108,875

Loans Receivable and Allowan_11

Loans Receivable and Allowance for Credit Losses - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Jan. 01, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
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)	2%
Positive or negative qualitative adjustment of the Loss Migration Ratio	0.25%
Financing receivable, balance threshold to determine individual evaluation for impairment	$ 1,000
Retained earnings	1,159,593		$ 1,150,547
Accrued interest receivable on loans	48,700		49,300
Loans held for sale, at lower of cost or fair value	2,763		$ 3,408
Provision for Loan, Lease, and Other Losses	2,600	$ 3,320
Cumulative Effect, Period of Adoption, Adjustment | ASU 2022-02
Financing Receivable, Allowance for Credit Loss [Line Items]
Retained earnings				$ 287
Commercial Real Estate and Commercial Business Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for sale, at lower of cost or fair value	2,300
Residential mortgage loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for sale, at lower of cost or fair value	$ 476

Loans Receivable and Allowan_12

Loans Receivable and Allowance for Credit Losses - Loan Modifications (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	$ 10,140	$ 0
% of Loan Class	0.07%
Principal forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	$ 10,140
Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	0
Payment delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	0
Term extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	0
CRE loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	$ 0
% of Loan Class	0%
CRE loans | Principal forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	$ 0
CRE loans | Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	0
CRE loans | Payment delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	0
CRE loans | Term extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	0
C&I loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	$ 10,140
% of Loan Class	0.25%
C&I loans | Principal forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	$ 10,140
C&I loans | Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	0
C&I loans | Payment delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	0
C&I loans | Term extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	0
Residential mortgage loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	$ 0
% of Loan Class	0%
Residential mortgage loans | Principal forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	$ 0
Residential mortgage loans | Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	0
Residential mortgage loans | Payment delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	0
Residential mortgage loans | Term extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	0
Consumer and other loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	$ 0
% of Loan Class	0%
Consumer and other loans | Principal forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	$ 0
Consumer and other loans | Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	0
Consumer and other loans | Payment delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	0
Consumer and other loans | Term extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loan Modifications	$ 0

Loans Receivable and Allowan_13

Loans Receivable and Allowance for Credit Losses - Principal Forgiveness (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loan modifications with payment defaults, modified in 12 months prior to default	$ 0	$ 0
C&I loans | Principal forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Forgiveness of principal	$ 4.4

Leases - Additional Information

Leases - Additional Information (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) lease	Mar. 31, 2023 USD ($) branch	Dec. 31, 2023 USD ($)
Lessee, Lease, Description [Line Items]
Extension options, term of extension	5 years
Rent expense	$ 4,200,000	$ 4,800,000
Operating Lease, Impairment Loss	$ 0	$ (93,000)
Number of branches consolidated | branch		1
Number of operating lease commitments not yet commenced | lease	0
Short-term operating lease liability	$ 14,128,000		$ 14,287,000
Long-term operating lease liability	$ 35,621,000		$ 38,383,000
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term for operating leases	1 year
Extension options, term of extension	3 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term for operating leases	9 years
Extension options, term of extension	5 years

Leases - Net Lease Cost (Detail

Leases - Net Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Leases [Abstract]
Operating lease cost	$ 3,606	$ 3,841
Variable lease cost	808	783
Sublease income	(39)	(42)
Net lease cost	$ 4,375	$ 4,582

Leases - Other Information (Det

Leases - Other Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) lease	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows for operating leases	$ 3,981	$ 3,961
ROU assets obtained in exchange for lease liabilities, net	$ 712	$ 2,031
Weighted-average remaining lease term - operating leases	3 years 10 months 24 days	4 years 6 months
Weighted-average discount rate - operating leases	2.84%	2.52%
Number of operating lease commitments not yet commenced | lease	0
Number of leases extended | lease	2
Number of new leases | lease	0
Long-term operating lease liability	$ 35,621		$ 38,383
Operating Lease, Impairment Loss	$ 0	$ (93)

Leases - Maturities of Remainin

Leases - Maturities of Remaining Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Leases [Abstract]
2024	$ 11,620
2025	14,144
2026	13,451
2027	7,932
2028	3,043
2029 and thereafter	2,575
Total lease payments	52,765
Less: imputed interest	3,016
Total lease obligations	$ 49,749	$ 52,670

Deposits (Details)

Deposits (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Deposits Disclosure [Line Items]
Time Deposits, $250,000 or More	$ 2,290,000,000		$ 2,240,000,000
Brokered deposits	1,420,000,000		1,540,000,000
Noninterest bearing	3,652,592,000		3,914,967,000
Money market and NOW accounts	4,393,971,000		4,169,543,000
Savings deposits	919,093,000		702,486,000
Time deposits	5,787,761,000		5,966,757,000
Total deposits	$ 14,753,417,000		$ 14,753,753,000
Percent of total deposit balance, by type	100%		100%
Net change in deposits	$ (336,000)	$ 89,408,000
Deposit Liabilities Reclassified as Loans Receivable	1,400,000		$ 2,000,000
Money market and NOW accounts
Deposits Disclosure [Line Items]
Brokered deposits	$ 227,800,000		$ 164,100,000
Percent of total deposit balance, by type	30%		28%
Time deposit accounts
Deposits Disclosure [Line Items]
Brokered deposits	$ 1,190,000,000		$ 1,370,000,000
Noninterest Bearing Demand Deposits
Deposits Disclosure [Line Items]
Percent of total deposit balance, by type	25%		27%
Savings Deposits
Deposits Disclosure [Line Items]
Percent of total deposit balance, by type	6%		5%
Bank Time Deposits
Deposits Disclosure [Line Items]
Percent of total deposit balance, by type	39%		40%
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%
Securities pledged as collateral	$ 211,600,000		$ 218,700,000
California State Treasurer | Letter of credit
Deposits Disclosure [Line Items]
Letter of credit pledged as collateral	$ 150,000,000

Borrowings - Maturities of FHLB

Borrowings - Maturities of FHLB Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Short-Term Debt [Line Items]
Total Borrowing Capacity	$ 5,870,589	$ 6,817,761
Amount	$ 795,634	$ 1,795,726
Weighted Average Rate	4.73%	4.54%
Available Borrowing Capacity	$ 5,074,955	$ 5,022,035
FRB
Short-Term Debt [Line Items]
Total Borrowing Capacity		4,167,168
Amount		$ 100,000
Weighted Average Rate		5.73%
Available Borrowing Capacity		$ 4,067,168
FRB Discount Window
Short-Term Debt [Line Items]
Total Borrowing Capacity	653,520	630,369
Amount	$ 0	$ 0
Weighted Average Rate	0%	0%
Available Borrowing Capacity	$ 653,520	$ 630,369
FRB Bank Term Funding Program (“BTFP”)
Short-Term Debt [Line Items]
Total Borrowing Capacity	695,634	1,707,909
Amount	$ 695,634	$ 1,695,726
Weighted Average Rate	4.61%	4.47%
Available Borrowing Capacity	$ 0	$ 12,183
Unsecured Federal Funds lines
Short-Term Debt [Line Items]
Total Borrowing Capacity	311,815	312,315
Amount	$ 0	$ 0
Weighted Average Rate	0%	0%
Available Borrowing Capacity	$ 311,815	$ 312,315
Federal Home Loan Bank Certificates and Obligations (FHLB)
Short-Term Debt [Line Items]
Total Borrowing Capacity	4,209,620
Amount	$ 100,000
Weighted Average Rate	5.59%
Available Borrowing Capacity	$ 4,109,620

Borrowings - Narrative (Details

Borrowings - Narrative (Details) $ in Thousands	Mar. 31, 2024 USD ($) securities	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
FHLB and FRB borrowings	$ 795,634	$ 1,795,726
Percent of assets	25%
Percent outstanding advances	100%
Unsecured Federal Funds lines
Debt Instrument [Line Items]
FHLB and FRB borrowings	$ 0	0
Qualifying Loans
Debt Instrument [Line Items]
Asset balance used to determine maximum borrowing capacity from federal reserve bank	$ 757,100
FRB Discount Window
Debt Instrument [Line Items]
Percent of qualifying assets (up to)	99%
Investment securities, pledged	$ 718,700
Number of securities pledged as collateral | securities	0
Mortgage Loans on Real Estate
Debt Instrument [Line Items]
Pledged as collateral, FHLB	$ 7,570,000	$ 7,600,000

Subordinated Debentures and C_3

Subordinated Debentures and Convertible Notes - Narrative (Details)		3 Months Ended		12 Months Ended
	Jun. 07, 2018 $ / shares	Mar. 31, 2024 USD ($) grantorTrust	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Jun. 06, 2018 USD ($)
Subordinated Borrowing [Line Items]
Repayment of convertible notes				$ 197,100,000
Repayment of Convertible Debt, Principal				19,900,000
Gain on debt extinguishment				405,000
Number of wholly owned subsidiary grantor trusts | grantorTrust		9
Amount of pooled trust preferred securities issued		$ 126,000,000
Right to defer consecutive payments of interest, maximum term		5 years
Carrying value of Debentures		$ 108,148,000		107,825,000
Other assets
Subordinated Borrowing [Line Items]
Investment in common trust securities		3,900,000		3,900,000
Carrying Value of Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying value of Debentures		108,148,000		107,800,000
Remaining discounts on acquired Debentures		21,800,000		22,100,000
Trust Preferred Securities Subject to Mandatory Redemption
Subordinated Borrowing [Line Items]
Amount of pooled trust preferred securities issued		$ 126,000,000
Percent included in tier one capital, maximum		25%
Excess of percent threshold included in tier two capital		25%
Convertible Notes
Subordinated Borrowing [Line Items]
Aggregate principal amount issued		$ 217,500,000			$ 217,500,000
Interest rate					2%
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%
Repurchase or put option, percentage of principal amount in cash	100%
Long-term Debt		$ 444,000		$ 444,000
Interest expense on convertible notes		$ 2,000	$ 1,300,000

Subordinated Debentures and C_4

Subordinated Debentures and Convertible Notes - Summary of Trust Preferred Securities and Debentures (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 126,000,000
Carrying Value of Subordinated Debentures	108,148,000	$ 107,825,000
Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	126,000,000
Carrying Value of Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 108,148,000	$ 107,800,000
Nara Capital Trust III
Subordinated Borrowing [Line Items]
Current Rate	8.74%
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 Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 5,155,000
Nara Statutory Trust IV
Subordinated Borrowing [Line Items]
Current Rate	8.43%
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 Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 5,155,000
Nara Statutory Trust V
Subordinated Borrowing [Line Items]
Current Rate	8.54%
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 Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 10,310,000
Nara Statutory Trust VI
Subordinated Borrowing [Line Items]
Current Rate	7.24%
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 Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 8,248,000
Center Capital Trust I
Subordinated Borrowing [Line Items]
Current Rate	8.43%
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 Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 15,265,000
Wilshire Trust II
Subordinated Borrowing [Line Items]
Current Rate	7.38%
Wilshire Trust II | Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 20,000,000
Wilshire Trust II | Carrying Value of Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 16,744,000
Wilshire Trust III
Subordinated Borrowing [Line Items]
Current Rate	6.99%
Wilshire Trust III | Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 15,000,000
Wilshire Trust III | Carrying Value of Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 11,984,000
Wilshire Trust IV
Subordinated Borrowing [Line Items]
Current Rate	6.97%
Wilshire Trust IV | Trust Preferred Security Amount
Subordinated Borrowing [Line Items]
Trust Preferred Security Amount	$ 25,000,000
Wilshire Trust IV | Carrying Value of Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 19,325,000
Saehan Capital Trust I
Subordinated Borrowing [Line Items]
Current Rate	7.18%
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 Subordinated Debentures
Subordinated Borrowing [Line Items]
Carrying Value of Subordinated Debentures	$ 15,962,000

Derivative Financial Instrume_3

Derivative Financial Instruments - Summary of Derivative Notional Amounts and Fair Values (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	$ 2,345,395,000	$ 2,336,809,000
Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	2,225,000,000	2,225,000,000
Interest rate contracts | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	725,000,000	725,000,000
Interest rate contracts | Correspondent Banks | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	1,092,318,000	1,096,292,000
Interest rate contracts | Customers | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	1,092,318,000	1,096,292,000
Interest rate swap, forward starting | Cash Flow Hedge | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	1,000,000,000	1,000,000,000
Interest rate swap, forward starting | Interest Rate Cap | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount		250,000,000
Foreign Exchange Contract | Correspondent Banks | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	7,932,000	10,739,000
Foreign Exchange Contract | Customers | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	620,000	1,744,000
Risk participation agreement | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	149,707,000	130,365,000
Interest Rate Lock Commitments and Forward Contracts | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	2,500,000	1,377,000
Interest Rate Cap | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	500,000,000	250,000,000
Other assets | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit valuation adjustment	62,486,000	54,370,000
Other assets | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate derivatives	281,000	10,960,000
Other assets | Interest rate contracts | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate derivatives	0	0
Other assets | Interest rate contracts | Correspondent Banks | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate derivatives	62,141,000	53,185,000
Other assets | Interest rate contracts | Customers | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate derivatives	210,000	1,117,000
Other assets | Interest rate swap, forward starting | Cash Flow Hedge | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate derivatives	281,000	10,812,000
Other assets | Interest rate swap, forward starting | Interest Rate Cap | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate derivatives		148,000
Other assets | Foreign Exchange Contract | Correspondent Banks | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign exchange contracts	111,000	4,000
Other assets | Foreign Exchange Contract | Customers | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign exchange contracts	17,000	57,000
Other assets | Risk participation agreement | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit valuation adjustment	0	0
Other assets | Interest Rate Lock Commitments and Forward Contracts | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit valuation adjustment	7,000	7,000
Other assets | Interest Rate Cap | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate derivatives	0	0
Other liabilities | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit valuation adjustment	63,929,000	55,869,000
Other liabilities | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate derivatives	11,290,000	1,149,000
Other liabilities | Interest rate contracts | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate derivatives	0	0
Other liabilities | Interest rate contracts | Correspondent Banks | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate derivatives	210,000	1,117,000
Other liabilities | Interest rate contracts | Customers | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate derivatives	63,693,000	54,505,000
Other liabilities | Interest rate swap, forward starting | Cash Flow Hedge | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate derivatives	7,430,000	0
Other liabilities | Interest rate swap, forward starting | Interest Rate Cap | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate derivatives		0
Other liabilities | Foreign Exchange Contract | Correspondent Banks | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign exchange contracts	7,000	202,000
Other liabilities | Foreign Exchange Contract | Customers | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign exchange contracts	0	0
Other liabilities | Risk participation agreement | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit valuation adjustment	13,000	28,000
Other liabilities | Interest Rate Lock Commitments and Forward Contracts | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit valuation adjustment	6,000	17,000
Other liabilities | Interest Rate Cap | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate derivatives	$ 3,860,000	$ 1,149,000

Derivative Financial Instrume_4

Derivative Financial Instruments - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	$ 2,345,395,000		$ 2,336,809,000
Not Designated as Hedging Instrument | Other liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit valuation adjustment	63,929,000		55,869,000
Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	2,225,000,000		2,225,000,000
Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified To Interest Income During Next 12 Months	5,200,000
Risk participation agreement | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	149,707,000		130,365,000
Risk participation agreement | Not Designated as Hedging Instrument | Other liabilities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit valuation adjustment	13,000		28,000
Interest rate contracts | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	725,000,000		725,000,000
Interest rate swap, forward starting | Designated as Hedging Instrument | Cash Flow Hedge
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	1,000,000,000		1,000,000,000
Interest rate swap, forward starting | Designated as Hedging Instrument | Interest Rate Cap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount			250,000,000
Interest Rate Lock Commitments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	2,500,000		1,400,000
Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on fair value of foreign exchange contracts	(263,000)	$ (6,000)
Cash Flow Hedge
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset	$ 0		$ 22,900,000

Derivative Financial Instrume_5

Derivative Financial Instruments - Summary of Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative [Line Items]
Interest rate cash flow hedge, gain (loss) reclassified to earnings, net	$ 3,778	$ 2,772
Interest income and fees on loans
Derivative [Line Items]
Interest rate cash flow hedge, gain (loss) reclassified to earnings, net	(1,000)	0
Interest expense on deposits
Derivative [Line Items]
Interest rate cash flow hedge, gain (loss) reclassified to earnings, net	3,483	1,719
Interest expense on FHLB and FRB borrowings
Derivative [Line Items]
Interest rate cash flow hedge, gain (loss) reclassified to earnings, net	$ 1,295	$ 1,053

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Supply Commitment [Line Items]
Loss contingencies for all legal claims	$ 450,000	$ 535,000
Loss contingencies for all legal claims	450,000	535,000
Commitments to extend credit
Supply Commitment [Line Items]
Commitments and letters of credit	2,105,176,000	2,274,239,000
Standby letters of credit
Supply Commitment [Line Items]
Commitments and letters of credit	132,811,000	132,132,000
Other letters of credit
Supply Commitment [Line Items]
Commitments and letters of credit	30,645,000	51,983,000
Commitments to fund investments in affordable housing partnerships
Supply Commitment [Line Items]
Commitments and letters of credit	$ 20,675,000	$ 21,017,000

Goodwill, Intangible Assets, _3

Goodwill, Intangible Assets, and Servicing Assets - Intangible Assets (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 464,450,000		$ 464,450,000
Goodwill impairment	0
Core Deposits
Finite-Lived Intangible Assets [Line Items]
Amortization expense related to core deposit intangible assets	401,000	$ 448,000
Gross Amount	20,901,000		20,901,000
Accumulated Amortization	(17,367,000)		(16,966,000)
Carrying Amount	$ 3,534,000		3,935,000
Foster Bankshares acquisition | Core Deposits
Finite-Lived Intangible Assets [Line Items]
Amortization Period	10 years
Gross Amount	$ 2,763,000		2,763,000
Accumulated Amortization	(2,763,000)		(2,763,000)
Carrying Amount	$ 0		0
Wilshire Bancorp acquisition | Core Deposits
Finite-Lived Intangible Assets [Line Items]
Amortization Period	10 years
Gross Amount	$ 18,138,000		18,138,000
Accumulated Amortization	(14,604,000)		(14,203,000)
Carrying Amount	$ 3,534,000		$ 3,935,000

Goodwill, Intangible Assets, _4

Goodwill, Intangible Assets, and Servicing Assets - Servicing Assets (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance at beginning of period	$ 9,631	$ 11,628	$ 11,628
Additions through originations of servicing assets	7	965
Amortization	(769)	(965)
Balance at end of period	8,869	$ 11,628	9,631
SBA servicing assets	7,000		7,600
Mortgage related servicing assets	1,900		2,100
Principal balances of loans serviced for other institutions	$ 953,500		$ 987,400
SBA Servicing Assets: Weighted-average discount rate	9.82%		11.12%
SBA Servicing Assets: Constant prepayment rate	12.22%		12.17%
Mortgage Servicing Assets: Weighted-average discount rate	11.13%		11%
Mortgage Servicing Assets: Constant prepayment rate	4.99%		9.52%

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income tax provision	$ 10,030	$ 13,681
Pretax income	$ 35,894	$ 52,802
Effective income tax rate	27.94%	25.91%
Unrecognized tax benefits	$ 807		$ 469
Decrease in unrecognized tax benefits is reasonably possible	$ 269

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value, Recurring (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
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	$ 43,925	$ 43,750
Recurring basis
Assets:
Equity investments with readily determinable fair value	4,317	4,363
Recurring basis | Designated as Hedging Instrument
Liabilities:
Derivative liabilities	11,310	1,379
Recurring basis | Interest rate contracts
Assets:
Derivative assets	62,351	54,302
Liabilities:
Derivative liabilities	63,903	55,622
Recurring basis | Mortgage banking derivatives
Assets:
Derivative assets	7	7
Liabilities:
Derivative liabilities	6	17
Recurring basis | Other derivatives
Assets:
Derivative assets	409	11,021
Liabilities:
Derivative liabilities	11,310	1,379
Recurring basis | Collateralized Mortgage Obligations [Member]
Assets:
Investment securities AFS:	731,193	747,719
Recurring basis | Mortgage-backed securities: Residential
Assets:
Investment securities AFS:	404,353	420,298
Recurring basis | Mortgage-backed securities: Commercial
Assets:
Investment securities AFS:	403,092	391,888
Recurring basis | Corporate securities
Assets:
Investment securities AFS:	19,407	19,434
Recurring basis | Municipal securities
Assets:
Investment securities AFS:	310,949	308,473
Recurring basis | Asset-backed Securities
Assets:
Investment securities AFS:	139,512	149,670
Recurring basis | US Treasury Notes Securities
Assets:
Investment securities AFS:	3,990	103,677
Recurring basis | Agency Securities
Assets:
Investment securities AFS:	3,893	3,900
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Equity investments with readily determinable fair value	4,317	4,363
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate contracts
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	0
Liabilities:
Derivative liabilities	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized Mortgage Obligations [Member]
Assets:
Investment securities AFS:	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities: Residential
Assets:
Investment securities AFS:	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities: Commercial
Assets:
Investment securities AFS:	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate securities
Assets:
Investment securities AFS:	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal securities
Assets:
Investment securities AFS:	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed Securities
Assets:
Investment securities AFS:	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury Notes Securities
Assets:
Investment securities AFS:	3,990	103,677
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency Securities
Assets:
Investment securities AFS:	0	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) | Designated as Hedging Instrument
Liabilities:
Derivative liabilities		1,351
Recurring basis | Significant Other Observable Inputs (Level 2) | Interest rate contracts
Assets:
Derivative assets	62,351	54,302
Liabilities:
Derivative liabilities	63,903	55,622
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage banking derivatives
Assets:
Derivative assets	7	7
Liabilities:
Derivative liabilities	6	17
Recurring basis | Significant Other Observable Inputs (Level 2) | Other derivatives
Assets:
Derivative assets	409	11,021
Liabilities:
Derivative liabilities	11,297	1,351
Recurring basis | Significant Other Observable Inputs (Level 2) | Collateralized Mortgage Obligations [Member]
Assets:
Investment securities AFS:	731,193	747,719
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities: Residential
Assets:
Investment securities AFS:	404,353	420,298
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities: Commercial
Assets:
Investment securities AFS:	403,092	391,888
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities
Assets:
Investment securities AFS:	19,407	19,434
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal securities
Assets:
Investment securities AFS:	310,130	307,615
Recurring basis | Significant Other Observable Inputs (Level 2) | Asset-backed Securities
Assets:
Investment securities AFS:	139,512	149,670
Recurring basis | Significant Other Observable Inputs (Level 2) | US Treasury Notes Securities
Assets:
Investment securities AFS:	0	0
Recurring basis | Significant Other Observable Inputs (Level 2) | Agency Securities
Assets:
Investment securities AFS:	3,893	3,900
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 contracts
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	0
Liabilities:
Derivative liabilities	13	28
Recurring basis | Significant Unobservable Inputs (Level 3) | Collateralized Mortgage Obligations [Member]
Assets:
Investment securities AFS:	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities: Residential
Assets:
Investment securities AFS:	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities: Commercial
Assets:
Investment securities AFS:	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate securities
Assets:
Investment securities AFS:	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Municipal securities
Assets:
Investment securities AFS:	819	858
Recurring basis | Significant Unobservable Inputs (Level 3) | Asset-backed Securities
Assets:
Investment securities AFS:	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | US Treasury Notes Securities
Assets:
Investment securities AFS:	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Agency Securities
Assets:
Investment securities AFS:	$ 0	$ 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
	Mar. 31, 2024	Mar. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 858	$ 943
Change in fair value included in other comprehensive income	(39)	39
Ending Balance	819	982
Other derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	28	32
Change in fair value included in other comprehensive income	(15)	3
Ending Balance	$ 13	$ 35

Fair Value Measurements - Ass_2

Fair Value Measurements - Assets Measured at Fair Value, Non-Recurring (Details) - Non-recurring basis - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
CRE loans
Assets:
Assets	$ 5,095	$ 3,475
C&I loans
Assets:
Assets	13,924	2,701
OREO
Assets:
Assets		63
Loans held for sale, net
Assets:
Assets		2,287
Quoted Prices in Active Markets for Identical Assets (Level 1) | CRE loans
Assets:
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | C&I loans
Assets:
Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | OREO
Assets:
Assets		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for sale, net
Assets:
Assets		0
Significant Other Observable Inputs (Level 2) | CRE loans
Assets:
Assets	0	0
Significant Other Observable Inputs (Level 2) | C&I loans
Assets:
Assets	0	0
Significant Other Observable Inputs (Level 2) | OREO
Assets:
Assets		0
Significant Other Observable Inputs (Level 2) | Loans held for sale, net
Assets:
Assets		2,287
Significant Unobservable Inputs (Level 3) | CRE loans
Assets:
Assets	5,095	3,475
Significant Unobservable Inputs (Level 3) | C&I loans
Assets:
Assets	$ 13,924	2,701
Significant Unobservable Inputs (Level 3) | OREO
Assets:
Assets		63
Significant Unobservable Inputs (Level 3) | Loans held for sale, net
Assets:
Assets		$ 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
	Mar. 31, 2024	Mar. 31, 2023
Loans Receivable | CRE loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gains (losses), fair value	$ (477)	$ (166)
Loans Receivable | C&I loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gains (losses), fair value	(4,341)	(2,794)
OREO
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gains (losses), fair value	$ 0	$ (271)

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial Assets:
Equity investments without readily determinable fair values	$ 39,600	$ 39,387
Financial Liabilities:
Amortized Cost	261,601	263,912
Fair Value	242,717	250,518
Level 1 | Carrying Amount
Financial Assets:
Cash and cash equivalents	1,185,296	1,928,967
Financial Liabilities:
Convertible notes	444	444
Level 1 | Estimated Fair Value
Financial Assets:
Cash and cash equivalents	1,185,296	1,928,967
Financial Liabilities:
Convertible notes	434	451
Level 2/3 | Carrying Amount
Financial Assets:
Accrued interest receivable	60,316	61,720
Level 2/3 | Estimated Fair Value
Financial Assets:
Accrued interest receivable	60,316	61,720
Level 2 | Carrying Amount
Financial Assets:
Equity investments without readily determinable fair values	39,608
Loans held for sale	2,763	3,408
Customers’ liabilities on acceptances	780	471
Financial Liabilities:
Noninterest bearing deposits	3,652,592	3,914,967
Money market, interest bearing demand and savings deposits	5,313,064	4,872,029
Time deposits	5,787,761	5,966,757
FHLB and FRB borrowings, Fair Value Disclosure	795,634
FHLB and FRB borrowings		1,795,726
Subordinated debentures	108,148	107,825
Accrued interest payable	122,467	168,174
Acceptances outstanding	780	471
Level 2 | Estimated Fair Value
Financial Assets:
Equity investments without readily determinable fair values	39,608	39,387
Loans held for sale	2,768	3,419
Customers’ liabilities on acceptances	780	471
Financial Liabilities:
Noninterest bearing deposits	3,652,592	3,914,967
Money market, interest bearing demand and savings deposits	5,313,064	4,872,029
Time deposits	5,793,249	5,974,125
FHLB and FRB borrowings, Fair Value Disclosure	797,206
FHLB and FRB borrowings		1,795,820
Subordinated debentures	97,376	99,358
Accrued interest payable	122,467	168,174
Acceptances outstanding	780	471
Level 3 | Carrying Amount
Financial Assets:
Loans receivable, net	13,560,420	13,694,925
Servicing assets, net	8,869	9,631
Level 3 | Estimated Fair Value
Financial Assets:
Loans receivable, net	13,162,050	13,270,444
Servicing assets, net	$ 15,288	$ 14,853

Stockholders' Equity - Discussi

Stockholders' Equity - Discussion of Equity (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Equity [Abstract]
Total stockholders’ equity	$ 2,112,270,000	$ 2,058,580,000	$ 2,121,243,000	$ 2,019,328,000
Share repurchase program, authorized amount	50,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	35,300,000
Repurchase of treasury stock	$ 0
Dividends paid (in dollars per share)	$ 0.14	$ 0.14
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	$ (3,800,000)	$ 2,800,000
Reclassification from AOCI, Debt Securities transferred from AFS to HTM amortization of unrealized losses, before tax	$ 847,000	$ 1,000,000

Stockholders' Equity - Changes

Stockholders' Equity - Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 2,121,243	$ 2,019,328
Unrealized net (losses) gains on securities available for sale	(13,734)	31,215
Unrealized net losses on interest rate contracts used for cash flow hedges	(8,186)	(5,938)
Reclassification adjustments for net gains realized in net income	(2,931)	(1,738)
Tax effect	7,311	(6,939)
Other comprehensive (loss) income, net of tax	(17,540)	16,600
Balance at end of period	2,112,270	2,058,580
Accumulated other comprehensive loss, net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(204,738)	(230,857)
Other comprehensive (loss) income, net of tax	(17,540)	16,600
Balance at end of period	$ (222,278)	$ (214,257)

Stock-Based Compensation - Plan

Stock-Based Compensation - Plan Description (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	May 23, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future grant (in shares)	96,233
Allocated share-based compensation expense	$ 2,700	$ 2,400
Tax benefit from compensation expense	$ 751	$ 609
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	28,136
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
Additional shares authorized for grant (in shares)	150,000
2019 Stock Incentive Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price of common stock, percent	100%
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	3 Months Ended
	Mar. 31, 2024 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding - beginning of period (in shares) | shares	629,367
Granted (in shares) | shares	0
Exercised (in shares) | shares	0
Expired (in shares) | shares	(28,136)
Forfeited (in shares) | shares	0
Outstanding - end of period (in shares) | shares	601,231
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	$ 16.61
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	15.23
Forfeited - weighted average exercise price (usd per share) | $ / shares	0
Outstanding - end of period, weighted-average exercise price per share (usd per share) | $ / shares	$ 16.68
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options exercisable - end of period (in shares) | shares	601,231
Options exercisable, weighted-average exercise price per share (usd per share) | $ / shares	$ 16.68
Outstanding, weighted-average remaining contractual life (years)	1 year 8 months 26 days
Options exercisable, weighted-average remaining contractual life (years)	1 year 8 months 26 days
Outstanding, aggregate intrinsic value | $	$ 0
Options exercisable, aggregate intrinsic value | $	$ 0

Stock-Based Compensation - Rest

Stock-Based Compensation - Restricted Stock and Performance Unit Activity (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Allocated share-based compensation expense	$ 2,700,000	$ 2,400,000
Tax benefit from compensation expense	751,000	609,000
Unrecognized compensation expense related to non-vested stock option grants	$ 0
Restricted stock and performance units
Number of Shares
Outstanding - beginning of period (in shares)	2,043,621
Granted (in shares)	34,634
Vested (in shares)	(771,422)
Forfeited (in shares)	(70,622)
Outstanding - end of period (in shares)	1,236,211
Weighted-Average Grant Date Fair Value
Outstanding - beginning of period (in dollars per share)	$ 12.09
Granted (in dollars per share)	15.49
Vested (in dollars per share)	12.82
Forfeited (in dollars per share)	15.04
Outstanding - end of period (in dollars per share)	$ 11.56
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	$ 8,500,000	$ 6,200,000
Total compensation cost not yet recognized, period for recognition	1 year 5 months 12 days
Unrecognized compensation expense related to non-vested equity instruments other than options	$ 8,500,000

Regulatory Matters (Details)

Regulatory Matters (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Bank Subsidiary
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital, Actual Amount	$ 1,948,503	$ 1,940,303
Common equity Tier 1 capital, Actual Ratio	0.1299	0.1275
Total capital (to risk-weighted assets), Amount
Total capital, Actual	$ 2,101,929	$ 2,086,762
Tier I capital (to risk-weighted assets), Amount
Tier 1 capital, Actual	1,948,503	1,940,303
Tier I capital (to average assets), Amount
Tier 1 capital, Actual	$ 1,948,503	$ 1,940,303
Total capital and Tier I capital (to risk-weighted assets), Ratio
Total capital (to Risk Weighted Assets), Actual	0.1401	0.1371
Total capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes	0.0800	0.0800
Tier 1 capital (to Risk Weighted Assets), Actual	0.1299	0.1275
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)	0.1027	0.0994
Tier I Capital (to Average Assets), Minimum For Capital Adequacy Purposes (Leverage)	0.0400	0.0400
Total capital (to Risk Weighted Assets), Required To Be Well Capitalized Under Prompt Corrective Action Provisions	0.1000	0.1000
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	$ 1,872,360	$ 1,869,774
Common equity Tier 1 capital, Actual Ratio	0.1247	0.1228
Total capital (to risk-weighted assets), Amount
Total capital, Actual	$ 2,130,033	$ 2,120,157
Tier I capital (to risk-weighted assets), Amount
Tier 1 capital, Actual	1,976,607	1,973,698
Tier I capital (to average assets), Amount
Tier 1 capital, Actual	$ 1,976,607	$ 1,973,698
Total capital and Tier I capital (to risk-weighted assets), Ratio
Total capital (to Risk Weighted Assets), Actual	0.1419	0.1392
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	0.1317	0.1296
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)	0.1042	0.1011
Tier I Capital (to Average Assets), Minimum For Capital Adequacy Purposes (Leverage)	0.0400	0.0400
Bank
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
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%	7%
Common Equity Tier 1 | Bank
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%	7%
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
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Service fees on deposit accounts	$ 2,587	$ 2,221
Wire transfer fees	812	773
Wire transfer fees
Disaggregation of Revenue [Line Items]
Wire transfer fees	263	406
Foreign exchange fees
Disaggregation of Revenue [Line Items]
Wire transfer fees	549	367
Noninterest Bearing Deposits
Disaggregation of Revenue [Line Items]
Service fees on deposit accounts	2,560	2,197
Noninterest Bearing Deposits | Monthly service charges
Disaggregation of Revenue [Line Items]
Service fees on deposit accounts	244	245
Noninterest Bearing Deposits | Customer analysis charges
Disaggregation of Revenue [Line Items]
Service fees on deposit accounts	1,423	1,126
Noninterest Bearing Deposits | NSF charges
Disaggregation of Revenue [Line Items]
Service fees on deposit accounts	814	735
Noninterest Bearing Deposits | Other service charges
Disaggregation of Revenue [Line Items]
Service fees on deposit accounts	79	91
Interest-bearing Deposits | Monthly service charges
Disaggregation of Revenue [Line Items]
Service fees on deposit accounts	$ 27	$ 24

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event - Territorial - $ / shares	Apr. 29, 2024	Apr. 26, 2024
Subsequent Event [Line Items]
Merger agreement, fixed exchange ratio of shares	0.8048
Merger agreement, share value		$ 8.82