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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current expense:      
Federal $ 21,027 $ 22,479 $ 18,076
State 12,144 8,910 9,807
Deferred expense:      
Federal (3,657) (380) 5,068
State (1,652) 476 2,048
Total income tax expense $ 27,862 $ 31,485 $ 34,999
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) (1.60%) (1.70%) (1.30%)
Stock incentive (as a percent) 0.20% (0.10%) (0.30%)
State income taxes, net (as a percent) 6.50% 5.50% 7.30%
Income on bank owned life insurance (as a percent) (0.90%) (0.90%) (0.60%)
Tax credit investments (3.20%) (1.30%)  
Other, net (as a percent) (0.30%) 0.90%  
Total (as a percent) 21.70% 23.40% 26.10%
Deferred tax assets:      
Unrealized loss on cash flow hedge $ 871 $ 80  
Allowance for credit losses 30,332 15,416  
Stock-based compensation 2,975 2,069  
Deferred compensation 66 166  
Affordable housing partnerships and other investments   697  
Purchase accounting adjustments 4,470 11,301  
Accrued vacation 610 827  
Lease liability 2,142 2,650  
Employee costs 1,598 1,048  
Other 431 809  
Total deferred tax assets 43,495 35,063  
Deferred tax liabilities:      
Unrealized gains on securities available for sale and cash flow hedges (14,151) (6,032)  
Basis in premises and equipment (348) (4,222)  
Affordable housing partnerships and other investments (1,995) (1,411)  
Purchase accounting adjustments (1,835) (1,023)  
Mortgage servicing assets (3,418) (3,717)  
Basis in core deposit, customer intangible assets, and asset purchase goodwill (12,714) (17,120)  
Deferred loan origination costs (2,654) (1,730)  
Lease right of use asset (2,130) (2,633)  
Unrealized gain on equity securities (276) (593)  
Other (405) (508)  
Total deferred tax liabilities (39,926) (38,989)  
Net deferred tax (liability) asset   (3,926)  
Net deferred tax (liability) asset 3,569    
Operating loss carryforwards 0    
Valuation allowance, deferred tax assets $ 0 $ 0