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Loans - Narrative (Details)
12 Months Ended
Dec. 31, 2022
USD ($)
loan
Sep. 30, 2023
USD ($)
loan
Sep. 30, 2022
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net deferred loan costs $ 10,132,000 $ 11,213,000 $ 9,978,000
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston 475,233,000 525,904,000 464,069,000
Loans $ 1,914,674,000 $ 2,079,860,000 $ 1,857,975,000
Loans sold by bank | loan     41
Ledger balances carried by loans     $ 5,200,000
Number of loans | loan 29    
TDR recorded investment $ 4,744,000    
Number of loans | loan 1    
TDR recorded investment more than 30 days past due $ 97,000    
Number of days past due 30 days    
Number of loans placed on TDR status | loan 1    
Number of TDR loans involved in bankruptcy (loan) | loan 4    
Loans classified as TDRs that are involved in bankruptcy $ 550,000    
Number of loans classified as TDRs that were on non-accrual status | loan 5    
Loans classified as TDRs that were on non-accrual status $ 339,000    
Loans classified as TDRs that are involved in foreclosure $ 0    
Number of mortgage loans in the process of foreclosure | loan 2 4 2
Mortgage loans in the process of foreclosure $ 166,000 $ 459,000 $ 166,000
Interest rate swap agreements | Designated as Hedging Instrument      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan adjustments 689,000 2,489,000 633,000
Interest rate swap agreements | Fair Value Hedging | Designated as Hedging Instrument      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan adjustments 0 705,000 0
Asset Pledged as Collateral      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 338,636,000 $ 332,657,000 $ 327,551,000