XML 63 R52.htm IDEA: XBRL DOCUMENT v3.21.2
Commitments (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Unadvanced Commitment on Impaired Loan    
Schedule of Commitments [Line Items]    
Estimated losses attributable to unadvanced commitments on impaired loans $ 7,028 $ 5,720
Commitments to extend credit    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts 2,422,097 1,946,068
Commitments to extend credit | Fixed Rate Loan Commitment    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts 269,700 160,600
Letters of credit    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts $ 67,071 $ 50,971
Letters of credit | Maximum    
Schedule of Commitments [Line Items]    
Remaining term 4 years 9 months  
Letters of credit | Minimum    
Schedule of Commitments [Line Items]    
Remaining term 1 month