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Loans - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
loan
Dec. 31, 2015
USD ($)
loan
Dec. 31, 2014
USD ($)
Schedule of Financing Receivables [Line Items]      
Net deferred loan costs included in loan balances $ 4,921 $ 3,686  
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston 257,122 279,463  
Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston 261,463 243,578  
Nonaccrual loans 7,774 7,372  
Interest income which would have been recognized on these loans, if interest had been accrued 288 369 $ 551
90 Plus Days And Accruing 777 136  
Loans to directors, officers and employees $ 34,889 $ 31,285  
Number of loans | loan 71 84  
TDR recorded investment $ 21,526 $ 23,923  
Number of loans | loan 12 8  
TDR recorded investment more than 30 days past due $ 2,303 $ 1,053  
Number of loans placed on TDR status in previous 12 months | loan 0 0  
Number of loans | loan 0 2  
Pre-modification recorded investment   $ 218  
Loans classified as TDRs that are involved in bankruptcy $ 1,693    
Number of loans classified as TDRs that were on non-accrual status | loan 9    
Loans classified as TDRs that were on non-accrual status $ 1,715    
Number of loans classified as TDRs that are involved in foreclosure | loan 1    
Loans classified as TDRs that are involved in foreclosure $ 46    
Number of mortgage loans in the process of foreclosure | loan 15 16  
Mortgage loans in the process of foreclosure $ 2,058 $ 1,513  
Loans Receivable in Bankruptcy      
Schedule of Financing Receivables [Line Items]      
Number of loans | loan 6