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Loans - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
loan
Sep. 30, 2022
USD ($)
loan
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2022
USD ($)
loan
Sep. 30, 2021
USD ($)
loan
Dec. 31, 2021
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net deferred loan costs $ 9,978,000 $ 9,978,000 $ 6,597,000 $ 9,978,000 $ 6,597,000 $ 7,890,000
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston 464,069,000 464,069,000 356,517,000 464,069,000 356,517,000 364,968,000
Loans $ 1,857,975,000 1,857,975,000 1,617,212,000 1,857,975,000 $ 1,617,212,000 $ 1,647,649,000
Number of loans sold | loan 41          
Financing receivable, past-due, non-accrual, and troubled debt restructure loans sold $ 5,200,000 5,200,000   $ 5,200,000    
Number of loans | loan       31 64 60
TDR recorded investment $ 4,926,000 $ 4,926,000 $ 10,051,000 $ 4,926,000 $ 10,051,000 $ 8,341,000
Number of loans | loan 1 1 12 1 12  
TDR recorded investment more than 30 days past due $ 83,000 $ 83,000 $ 1,095,000 $ 83,000 $ 1,095,000  
Number of days past due       30 days 30 days  
Number of loans placed on TDR status in previous 12 months | loan         2  
Number of loans | loan   1 0 1 3  
Number of TDR loans involved in bankruptcy (loan) | loan 4 4   4    
Loans classified as TDRs that are involved in bankruptcy $ 558,000 $ 558,000   $ 558,000    
Number of loans classified as TDRs that were on non-accrual status | loan 6 6   6    
Loans classified as TDRs that were on non-accrual status $ 430,000 $ 430,000   $ 430,000    
Loans classified as TDRs that are involved in foreclosure $ 0 $ 0   $ 0    
Number of mortgage loans in the process of foreclosure | loan 2 2 10 2 10  
Mortgage loans in the process of foreclosure $ 166,000 $ 166,000 $ 839,000 $ 166,000 $ 839,000  
Asset Pledged as Collateral            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans $ 327,551,000 $ 327,551,000 $ 291,188,000 $ 327,551,000 $ 291,188,000 $ 295,090,000