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Loans - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net deferred loan costs $ 6,307 $ 5,469 $ 6,307 $ 5,469 $ 5,748
Qualifying first mortgage loans 317,053 249,329 317,053 249,329 239,805
Loans pledged as collateral 227,084 294,315 $ 227,084 $ 294,315 $ 290,247
Loans classified as TDR (loan) | loan     72 68 62
Value of loans classified as TDR $ 25,606 $ 20,301 $ 25,606 $ 20,301 $ 17,801
Number of Loans | loan 8 10 8 10  
Value of TDR loans more than 30 days past due $ 893 $ 1,336 $ 893 $ 1,336  
Number of TDR loans more than 30 days past due (loan) | loan   0   0  
Number of loans placed on TDR status (loan) | loan 3 0 10 0  
Number of TDR loans involved in bankruptcy (loan) | loan 4   4    
Value of TDR loans involved in bankruptcy $ 681   $ 681    
Number of TDR loans on non-accrual status (loan) | loan 12   12    
Value of TDR loans on non-accrual status $ 7,795   $ 7,795    
Number of TDR loans in the process of foreclosure (loan) | loan 4   4    
Loans classified as TDRs in process of foreclosure $ 504   $ 504    
Number of mortgage loans in the process of foreclosure (loan) | loan 14 12 14 12  
Value of mortgage loans in the process of foreclosure $ 1,524 $ 1,919 $ 1,524 $ 1,919  
Unallocated          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of days past due     30 days 30 days