v3.26.1
Other Commitments and Contingencies - Off-Balance-Sheet Financial Instruments Related to Credit Risk (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]    
Off-balance-sheet financial instruments related to credit risk $ 395,609 $ 347,187
Unadvanced Lines of Credit    
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]    
Off-balance-sheet financial instruments related to credit risk 297,880 258,739
Unadvanced Construction Loans    
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]    
Off-balance-sheet financial instruments related to credit risk 40,106 27,799
Residential Mortgage Loan Commitments    
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]    
Off-balance-sheet financial instruments related to credit risk 4,092 3,976
Commercial and Mortgage Loan Commitments    
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]    
Off-balance-sheet financial instruments related to credit risk 49,560 51,947
Standby Letters of Credit    
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]    
Off-balance-sheet financial instruments related to credit risk $ 3,971 $ 4,726