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Loans - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
loan
Mar. 31, 2017
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net deferred loan costs $ 5,990 $ 5,167 $ 5,748
Qualifying first mortgage loans 237,239 254,512 239,805
Loans pledged as collateral $ 255,020 $ 285,464 $ 290,247
Loans classified as TDR (loan) | loan 69 70 62
Value of loans classified as TDR $ 18,709 $ 21,121 $ 17,801
Number of Loans | loan 7 9  
Value of TDR loans more than 30 days past due $ 810 $ 1,651  
Number of TDR loans more than 30 days past due (loan) | loan   0  
Number of loans placed on TDR status (loan) | loan 7 0  
Number of TDR loans involved in bankruptcy (loan) | loan 4    
Value of TDR loans involved in bankruptcy $ 684    
Number of TDR loans on non-accrual status (loan) | loan 11    
Value of TDR loans on non-accrual status $ 1,276    
Number of TDR loans in the process of foreclosure (loan) | loan 3    
Loans classified as TDRs in process of foreclosure $ 456    
Number of mortgage loans in the process of foreclosure (loan) | loan 13 12  
Value of mortgage loans in the process of foreclosure $ 1,388 $ 1,773  
Unallocated      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of days past due 30 days 30 days