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Commitments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Commitments to extend credit    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts $ 1,946,068 $ 1,469,413
Letters of credit    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts $ 50,971 47,969
Letters of credit | Minimum    
Schedule of Commitments [Line Items]    
Remaining term 1 month  
Letters of credit | Maximum    
Schedule of Commitments [Line Items]    
Remaining term 4 years  
State tax credits, held for sale    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts $ 24,473 28,035
Low Income Housing Tax Credits [Domain]    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts 0 704
SBIC Capital Commitments [Domain]    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts 23,400 20,829
Unadvanced Commitment on Impaired Loan    
Schedule of Commitments [Line Items]    
Estimated losses attributable to unadvanced commitments on impaired loans 5,700  
Fixed Rate Loan Commitment | Commitments to extend credit    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts $ 160,600 $ 144,800