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Income Taxes - Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]                      
Statutory U.S. federal income tax rate                 $ 16,228    
U.S. state and local income taxes, net of U.S. federal income tax effect (1) (2)                 10,628    
Energy tax credit                 (38,182)    
Low income housing tax credit                 (8,587)    
Energy tax credit investment amortization expense, net of benefit from tax losses                 35,371    
BOLI                 (683)    
Excess tax expense on executive compensation limitation                 1,161    
FDIC premium                 461    
Tax exempt municipal bonds and loans                 (82)    
Other                 838    
Changes in uncertain tax positions                 (15)    
Adjustments on deferred taxes                 (1,692)    
Other                 243    
Effective income tax rate $ 4,662 $ 5,595 $ (1,316) $ 6,748 $ 6,089 $ 7,941 $ 9,274 $ 10,030 $ 15,689 $ 33,334 $ 44,214
Effective Income Tax Rate Reconciliation, Percent [Abstract]                      
Statutory U.S. federal income tax rate                 21.00% 21.00% 21.00%
U.S. state and local income taxes, net of U.S. federal income tax effect (1) (2)                 13.75% 8.74% 8.79%
Energy tax credit                 (49.41%)    
Low income housing tax credit                 (11.11%)    
Energy tax credit investment amortization expense, net of benefit from tax losses                 45.77%    
BOLI                 (0.88%)    
Excess tax expense on executive compensation limitation                 1.50%    
FDIC premium                 0.60%    
Tax exempt municipal bonds and loans                 (0.11%)    
Other                 1.08%    
Changes in uncertain tax positions                 (0.02%) 0.21% (0.59%)
Adjustments on deferred taxes                 (2.19%)    
Other                 0.32% 1.20% 1.37%
Nondeductible transaction costs                   0.60% 0.00%
Tax credits and benefits, net of amortization expenses                   (7.25%) (4.67%)
BOLI                   (0.28%) (0.24%)
Tax exempt municipal bonds and loans                   (0.08%) (0.82%)
State tax rate change                   0.93% 0.02%
Effective income tax rate                 20.30% 25.07% 24.86%
State and Local Jurisdiction                      
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]                      
Adjustments on deferred taxes                 $ (710)    
California                      
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]                      
U.S. state and local income taxes, net of U.S. federal income tax effect (1) (2)                 $ 4,800