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Loans - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2021
USD ($)
loan
loan_modification_request
Sep. 30, 2020
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net deferred loan costs included in loan balances $ 6,597 $ 5,323 $ 6,597 $ 5,323 $ 6,931
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston 356,517 379,387 356,517 379,387 378,183
Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston 291,188 271,905 $ 291,188 $ 271,905 $ 259,599
Number of loans | loan     64 78 74
Loans $ 1,617,212 $ 1,436,646 $ 1,617,212 $ 1,436,646 $ 1,476,761
Percentage of loans receivable, by type 100.00% 100.00% 100.00% 100.00% 100.00%
TDR recorded investment $ 10,051 $ 13,390 $ 10,051 $ 13,390 $ 11,534
Number of loans | loan 12 15 12 15  
TDR recorded investment more than 30 days past due $ 1,095 $ 2,814 $ 1,095 $ 2,814  
Number of loans placed on TDR status in previous 12 months | loan     2 2  
Number of loans | loan 0 1 3 3  
Number of TDR loans involved in bankruptcy (loan) | loan 8   8    
Loans classified as TDRs that are involved in bankruptcy $ 961   $ 961    
Number of loans classified as TDRs that were on non-accrual status | loan 19   19    
Loans classified as TDRs that were on non-accrual status $ 1,648   $ 1,648    
Number of loans classified as TDRs that are involved in foreclosure | loan 0   0    
Number of mortgage loans in the process of foreclosure | loan 10 17 10 17  
Mortgage loans in the process of foreclosure $ 839 $ 2,083 $ 839 $ 2,083  
Small Business Administration (SBA), CARES Act, Excluding Paycheck Protection Program          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of loans | loan_modification_request     1,051    
Loans $ 287,922   $ 287,922    
Percentage of loans receivable, by type 18.30%   18.30%    
Unallocated          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 0 $ 0 $ 0 $ 0 $ 0
Number of days past due     30 days 30 days  
Exemption from Troubled Debt Restructure Designation, CARES Act | Original or Subsequent Modification          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 6,609   $ 6,609    
Percentage of loans receivable, by type 0.41%   0.41%