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Loans - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Dec. 31, 2018
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net deferred loan costs $ 7,181 $ 6,428 $ 7,181 $ 6,428 $ 6,615
Qualifying first mortgage loans 308,163 311,152 308,163 311,152 290,138
Loans pledged as collateral 254,076 229,769 $ 254,076 $ 229,769 $ 237,152
Loans classified as TDR (loan) | loan     82 71 76
Value of loans classified as TDR $ 24,281 $ 25,661 $ 24,281 $ 25,661 $ 25,222
Number of loans | loan 9 10 9 10  
Value of TDR loans more than 30 days past due $ 1,084 $ 1,271 $ 1,084 $ 1,271  
Number of TDR loans more than 30 days past due (loan) | loan 4 1 4 1  
Number of loans placed on TDR status (loan) | loan 2 1 10 11  
Number of TDR loans involved in bankruptcy (loan) | loan 9   9    
Value of TDR loans involved in bankruptcy $ 1,004   $ 1,004    
Number of TDR loans on non-accrual status (loan) | loan 26   26    
Value of TDR loans on non-accrual status $ 8,932   $ 8,932    
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 15 14 15 14  
Value of mortgage loans in the process of foreclosure $ 1,649 $ 1,337 $ 1,649 $ 1,337  
Unallocated          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of days past due     30 days 30 days