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Loans - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
loan
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2019
USD ($)
loan
Jun. 30, 2018
USD ($)
loan
Dec. 31, 2018
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net deferred loan costs $ 7,124 $ 6,307 $ 7,124 $ 6,307 $ 6,615
Qualifying first mortgage loans 312,568 317,053 312,568 317,053 290,138
Loans pledged as collateral 239,481 227,084 $ 239,481 $ 227,084 $ 237,152
Loans classified as TDR (loan) | loan     83 72 76
Value of loans classified as TDR $ 24,454 $ 25,606 $ 24,454 $ 25,606 $ 25,222
Number of Loans | loan 15 8 15 8  
Value of TDR loans more than 30 days past due $ 1,681 $ 893 $ 1,681 $ 893  
Number of TDR loans more than 30 days past due (loan) | loan 3 0 3 0  
Number of loans placed on TDR status (loan) | loan 4 3 9 10  
Number of TDR loans involved in bankruptcy (loan) | loan 9   9    
Value of TDR loans involved in bankruptcy $ 1,025   $ 1,025    
Number of TDR loans on non-accrual status (loan) | loan 23   23    
Value of TDR loans on non-accrual status $ 8,666   $ 8,666    
Number of TDR loans in the process of foreclosure (loan) | loan 3   3    
Loans classified as TDRs in process of foreclosure $ 398   $ 398    
Number of mortgage loans in the process of foreclosure (loan) | loan 11 14 11 14  
Value of mortgage loans in the process of foreclosure $ 1,231 $ 1,524 $ 1,231 $ 1,524  
Unallocated          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of days past due     30 days 30 days