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Loans - Narrative (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2016
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net deferred loan costs $ 5,560 $ 4,648 $ 4,921
Qualifying first mortgage loans 245,000 262,001 257,122
Loans pledged as collateral $ 297,712 $ 261,416 $ 261,463
Loans classified as TDR (loan) | loan 67 75 71
Value of loans classified as TDR $ 19,760 $ 22,025 $ 21,526
Number of Loans | loan 14 8  
Value of TDR loans more than 30 days past due $ 1,849 $ 1,060  
Number of TDR loans more than 30 days past due (loan) | loan   0  
Number of loans placed on TDR status (loan) | loan 0 0  
Number of TDR loans involved in bankruptcy (loan) | loan 4    
Value of TDR loans involved in bankruptcy $ 826    
Number of TDR loans on non-accrual status (loan) | loan 8    
Value of TDR loans on non-accrual status $ 1,075    
Number of TDR loans in the process of foreclosure (loan) | loan 1    
Loans classified as TDRs in process of foreclosure $ 108    
Number of mortgage loans in the process of foreclosure (loan) | loan 14 13  
Value of mortgage loans in the process of foreclosure $ 1,861 $ 1,508  
Unallocated      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of days past due 30 days 30 days