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Commitments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Commitments to extend credit    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts $ 2,481,173 $ 1,946,068
Letters of credit    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts $ 77,314 50,971
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 $ 18,118 24,473
SBIC Capital Commitments [Domain]    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts 21,553 23,400
Unadvanced Commitment on Impaired Loan    
Schedule of Commitments [Line Items]    
Estimated losses attributable to unadvanced commitments on impaired loans 7,600  
Fixed Rate Loan Commitment | Commitments to extend credit    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts $ 238,700 $ 160,600