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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current expense:      
Federal $ 20,261 $ 21,027 $ 22,479
State 8,448 12,144 8,910
Deferred expense:      
Federal 3,644 (3,657) (380)
State 1,021 (1,652) 476
Total income tax expense $ 33,374 $ 27,862 $ 31,485
Reconciliation of federal and state income taxes at statutory rates to the income taxes included in the statements of operations      
Income tax at statutory rate (as a percent) 21.00% 21.00% 21.00%
Tax-exempt interest, net (as a percent) (1.10%) (1.60%) (1.70%)
Stock incentive (as a percent)   0.20% (0.10%)
State income taxes, net (as a percent) 4.50% 6.50% 5.50%
Income on bank owned life insurance (as a percent) (0.70%) (0.90%) (0.90%)
Tax credit investments (3.60%) (3.20%) (1.30%)
Other, net (as a percent) 1.20% (0.30%) 0.90%
Total (as a percent) 21.30% 21.70% 23.40%
Deferred tax assets:      
Unrealized losses on debt securities available for sale $ 9,199    
ACL 25,884 $ 30,332  
Unrealized loss on cash flow hedge 273 871  
Stock-based compensation 4,204 2,975  
Deferred compensation 55 66  
Purchase accounting adjustments 1,213 4,470  
Accrued vacation 398 610  
Lease liability 2,893 2,142  
Employee costs 2,847 1,598  
Other 390 431  
Total deferred tax assets 47,356 43,495  
Deferred tax liabilities:      
Unrealized gains on securities available for sale and cash flow hedges   (14,151)  
Basis in premises and equipment (1,347) (348)  
Affordable housing partnerships and other investments (3,696) (1,995)  
Purchase accounting adjustments (1,362) (1,835)  
Mortgage servicing assets (2,853) (3,418)  
Basis in core deposit, customer intangible assets, and asset purchase goodwill (9,485) (12,714)  
Deferred loan origination costs (2,454) (2,654)  
Lease right of use asset (2,877) (2,130)  
Unrealized gain on equity securities (1,099) (276)  
Other (560) (405)  
Total deferred tax liabilities (25,733) (39,926)  
Net deferred tax (liability) asset 21,623 3,569  
Valuation allowance, deferred tax assets $ 0 $ 0