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Loans - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
loan
Mar. 31, 2020
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net deferred loan costs $ 5,328 $ 7,551 $ 6,931
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston 362,271 401,555 378,183
Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston $ 275,993 $ 260,703 $ 259,599
Number of loans | loan 73 81 74
Loans $ 1,516,772 $ 1,344,208 $ 1,476,761
Percentage of loans receivable, by type 100.00% 100.00% 100.00%
TDR recorded investment $ 11,306 $ 14,968 $ 11,534
Number of loans | loan 11 22  
TDR recorded investment more than 30 days past due $ 1,017 $ 3,622  
Number of loans placed on TDR status in previous 12 months | loan 0 1  
Number of loans | loan 1 2  
Number of TDR loans involved in bankruptcy (loan) | loan 6    
Loans classified as TDRs that are involved in bankruptcy $ 708    
Number of loans classified as TDRs that were on non-accrual status | loan 21    
Loans classified as TDRs that were on non-accrual status $ 1,908    
Number of loans classified as TDRs that are involved in foreclosure | loan 1    
Loans classified as TDRs that are involved in foreclosure $ 92    
Number of mortgage loans in the process of foreclosure | loan 14 15  
Mortgage loans in the process of foreclosure $ 1,067 $ 2,284  
Unallocated      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 0 $ 0 $ 0
Number of days past due 30 days 30 days  
Original or Subsequent Modification | Exemption from Troubled Debt Restructure Designation, CARES Act      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 50,600    
Percentage of loans receivable, by type 3.30%    
Small Business Administration (SBA), CARES Act, Paycheck Protection Program      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans | loan 1,037    
Loans $ 292,003    
Percentage of loans receivable, by type 20.00%