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Loans - Narrative (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2016
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable Modifications Number Of Contracts Greater Than30 Days Past Due | loan 10 9  
Net deferred loan costs $ 5,469 $ 4,478 $ 4,921
Qualifying first mortgage loans 313,709 270,293 257,122
Loans pledged as collateral $ 294,315 $ 263,707 $ 261,463
Loans classified as TDR (loan) | loan 68 78 71
Value of loans classified as TDR $ 20,301 $ 22,595 $ 21,526
Number of TDR loans more than 30 days past due (loan) | loan 10 1  
Value of TDR loans more than 30 days past due $ 1,336 $ 979  
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 $ 830    
Number of TDR loans on non-accrual status (loan) | loan 8    
Value of TDR loans on non-accrual status $ 1,090    
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 12 13  
Value of mortgage loans in the process of foreclosure $ 1,919 $ 1,514  
Unallocated      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of days past due 30 days 30 days