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Loans - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
Schedule of Financing Receivables [Line Items]      
Net deferred loan costs included in loan balances $ 6,931 $ 7,419  
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston 378,183 296,871  
Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston $ 259,599 $ 240,133  
Number of loans | loan 74 81  
Loans $ 1,476,761 $ 1,297,075 $ 1,238,283
Forgiveness payments received 1,661 1,120 $ 1,273
Nonaccrual loans 6,721 16,649  
Interest income which would have been recognized on these loans, if interest had been accrued 558 906  
Loans more than 90 days past due accruing interest 1,505 1,560  
Loans to directors, officers and employees 36,880 35,071  
Amounts past due 9,722 15,017  
TDR recorded investment $ 11,534 $ 21,424  
Number of loans | loan 14 13  
TDR recorded investment more than 30 days past due $ 1,577 $ 1,510  
Number of loans placed on TDR status in previous 12 months | loan 1 2  
Number of loans | loan 3 11  
Loans classified as TDRs that are involved in bankruptcy $ 810    
Number of loans classified as TDRs that were on non-accrual status | loan 22    
Loans classified as TDRs that were on non-accrual status $ 2,216    
Number of loans classified as TDRs that are involved in foreclosure | loan 2    
Loans classified as TDRs that are involved in foreclosure $ 254    
Number of mortgage loans in the process of foreclosure | loan 11 14  
Mortgage loans in the process of foreclosure $ 1,109 $ 1,502  
Original or Subsequent Modification | Exemption from Troubled Debt Restructure Designation, CARES Act      
Schedule of Financing Receivables [Line Items]      
Loans $ 62,208    
Percentage of loans receivable, by type 0.042    
Out of Modification | Exemption from Troubled Debt Restructure Designation, CARES Act      
Schedule of Financing Receivables [Line Items]      
Loans $ 213,819    
Amounts past due $ 972    
Past due rate 0.45%    
Small Business Administration (SBA), CARES Act, Paycheck Protection Program      
Schedule of Financing Receivables [Line Items]      
Number of loans | loan 1,718    
Loans $ 97,566    
Forgiveness payments received $ 37,000    
Small Business Administration (SBA), CARES Act, Excluding Paycheck Protection Program      
Schedule of Financing Receivables [Line Items]      
Number of loans | loan 1,031    
Loans $ 291,100    
Percentage of loans receivable, by type 0.196    
Loans Receivable in Bankruptcy      
Schedule of Financing Receivables [Line Items]      
Number of loans | loan 7