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Commitments and Contingent Liabilities (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Unadvanced Commitment on Impaired Loan    
Schedule of Commitments [Line Items]    
Estimated losses attributable to unadvanced commitments on impaired loans $ 6,300 $ 6,100
Commitments to extend credit    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts 2,919,534 3,001,565
Commitments to extend credit | Fixed Rate Loan Commitment    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts 127,200 156,500
Letters of credit    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts $ 107,535 $ 137,926
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