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Loans - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net deferred loan costs $ 6,428 $ 5,560 $ 6,428 $ 5,560 $ 5,748
Qualifying first mortgage loans 311,152 245,000 311,152 245,000 239,805
Loans pledged as collateral 229,769 297,712 $ 229,769 $ 297,712 $ 290,247
Loans classified as TDR (loan) | loan     71 67 62
Value of loans classified as TDR $ 25,661 $ 19,760 $ 25,661 $ 19,760 $ 17,801
Number of Loans | loan 10 14 10 14  
Value of TDR loans more than 30 days past due $ 1,271 $ 1,849 $ 1,271 $ 1,849  
Number of TDR loans more than 30 days past due (loan) | loan   0   0  
Number of loans placed on TDR status (loan) | loan 1 0 11 0  
Number of TDR loans involved in bankruptcy (loan) | loan 4   4    
Value of TDR loans involved in bankruptcy $ 676   $ 676    
Number of TDR loans on non-accrual status (loan) | loan 12   12    
Value of TDR loans on non-accrual status $ 7,735   $ 7,735    
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 14 14 14  
Value of mortgage loans in the process of foreclosure $ 1,337 $ 1,861 $ 1,337 $ 1,861  
Unallocated          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of days past due     30 days 30 days