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Income Taxes Table (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]                      
Current Federal Tax Expense (Benefit)                 $ 14,475 $ 22,076 $ 52,676
Current State and Local Tax Expense (Benefit)                 13,576 17,998 34,050
Current Income Tax Expense (Benefit)                 28,051 40,074 86,726
Deferred Federal Income Tax Expense (Benefit)                 3,760 3,158 (6,366)
Deferred State and Local Income Tax Expense (Benefit)                 1,523 982 (2,589)
Deferred Income Tax Expense (Benefit)                 5,283 4,140 (8,955)
Federal Income Tax Expense (Benefit), Continuing Operations                 18,235 25,234 46,310
State and Local Income Tax Expense (Benefit), Continuing Operations                 15,099 18,980 31,461
Income tax provision $ 6,089 $ 7,941 $ 9,274 $ 10,030 $ 7,124 $ 9,961 $ 13,448 $ 13,681 $ 33,334 $ 44,214 $ 77,771
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent                 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent                 8.74% 8.79% 8.58%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent                 0.60% 0.00% 0.00%
Effective Income Tax Rate Reconciliation, TaxCredits, Investment                 (7.25%) (4.67%) (2.99%)
Effective Income Tax Rate Reconciliation, Tax Credit, Bank owned, Percent life insurance                 (0.28%) (0.24%) (0.22%)
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent                 (0.08%) (0.82%) (0.26%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent                 0.93% 0.02% 0.15%
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent                 0.21% (0.59%) (0.23%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent                 1.20% 1.37% 0.24%
Effective income tax rate                 25.07% 24.86% 26.27%
Deferred Tax Assets, Depreciation 0       651       $ 0 $ 651  
Deferred Tax Asset, Tax Deferred Expense, Reserve and Accrual, Financing Receivable, Allowance for Credit Loss 47,626       50,402       47,626 50,402  
Deferred Tax Assets, Operating Loss Carryforwards 1,100       1,238       1,100 1,238  
Deferred Tax Assets, Investment Security Provision 468       607       468 607  
Deferred Tax Assets, State Taxes 1,960       2,962       1,960 2,962  
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation 21       28       21 28  
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other 119       113       119 113  
Deferred Tax Assets, Investments 4       4       4 4  
Deferred Tax Assets, Nonaccrual Loan Interest 4,753       4,246       4,753 4,246  
Deferred Tax Assets, Other Real Estate Owned 0       14       0 14  
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost 2,754       3,902       2,754 3,902  
Deferred Tax Assets, Lease Expense, Right-of-Use Asset 13,945       16,734       13,945 16,734  
Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss 95,025       85,386       95,025 85,386  
Deferred Tax Assets, Tax Deferred Expense, Other 7,290       7,132       7,290 7,132  
Deferred Tax Assets, Gross 175,065       173,419       175,065 173,419  
Deferred Tax Liabilities, Purchase Accounting Fair Value Adjustment (8,331)       (7,667)       (8,331) (7,667)  
Deferred Tax Liabilities, Depreciation (95)       0       (95) 0  
Deferred Tax Liabilities, Tax Deferred Income (77)       (79)       (77) (79)  
Deferred Tax Liabilities, Deferred Loan Costs (6,981)       (8,410)       (6,981) (8,410)  
Deferred Tax Liabilities, State Taxes Deferred and Other (3,376)       (3,660)       (3,376) (3,660)  
Deferred Tax Liabilities, Prepaid Expenses (2,834)       (2,228)       (2,834) (2,228)  
Deferred Tax Liabilities, Intangible Assets (846)       (1,351)       (846) (1,351)  
Deferred Tax Liabilities, Right-of-Use Asset (12,481)       (14,809)       (12,481) (14,809)  
Deferred Tax Liabilities, Gross (35,021)       (38,204)       (35,021) (38,204)  
Deferred Tax Assets, Net 140,044       135,215       140,044 135,215  
Operating Loss Carryforwards [Line Items]                      
Unrecognized tax benefits 696       469       696 469 $ 2,951
Additions based on tax positions related to prior years                 311 169  
Settlement of tax positions related to prior years                 0 (1,234)  
Expiration of statute of limitations                 (84) (1,417)  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 707       434       707 434  
Internal Revenue Service (IRS)                      
Operating Loss Carryforwards [Line Items]                      
Operating Loss Carryforwards 4,507       5,153       4,507 5,153  
Operating Loss Carryforwards Limitations On Use Annual Limitation Amount 646       646       646 646  
Internal Revenue Service (IRS) | Ownership Change | Saehan Bank                      
Operating Loss Carryforwards [Line Items]                      
Operating Loss Carryforwards 1,357       1,583       1,357 1,583  
Operating Loss Carryforwards Limitations On Use Annual Limitation Amount 226       226       226 226  
Internal Revenue Service (IRS) | Ownership Change | Pacific International Bancorp. Inc.                      
Operating Loss Carryforwards [Line Items]                      
Operating Loss Carryforwards 3,150       3,570       3,150 3,570  
Operating Loss Carryforwards Limitations On Use Annual Limitation Amount 420       420       420 420  
State and Local Jurisdiction                      
Operating Loss Carryforwards [Line Items]                      
Operating Loss Carryforwards 1,809       2,035       1,809 2,035  
Operating Loss Carryforwards Limitations On Use Annual Limitation Amount 226       226       226 226  
State and Local Jurisdiction | Ownership Change | Saehan Bank                      
Operating Loss Carryforwards [Line Items]                      
Operating Loss Carryforwards 1,809       2,035       1,809 2,035  
Operating Loss Carryforwards Limitations On Use Annual Limitation Amount 226       226       226 226  
State and Local Jurisdiction | Ownership Change | Pacific International Bancorp. Inc.                      
Operating Loss Carryforwards [Line Items]                      
Operating Loss Carryforwards 0       0       0 0  
Operating Loss Carryforwards Limitations On Use Annual Limitation Amount $ 0       $ 0       $ 0 $ 0