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Loans - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
loan
Mar. 31, 2019
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net deferred loan costs $ 7,551 $ 6,878 $ 7,419
Qualifying first mortgage loans 401,555 321,290 296,871
Loans pledged as collateral $ 260,703 $ 251,591 $ 240,133
Loans classified as TDR (loan) | loan 81 80 81
Value of loans classified as TDR $ 14,968 $ 25,386 $ 21,424
Number of loans | loan 22 10  
Value of TDR loans more than 30 days past due $ 3,622 $ 1,129  
Number of TDR loans more than 30 days past due (loan) | loan 1 3  
Number of loans placed on TDR status (loan) | loan 2 5  
Number of TDR loans involved in bankruptcy (loan) | loan 9    
Value of TDR loans involved in bankruptcy $ 978    
Number of TDR loans on non-accrual status (loan) | loan 24    
Value of TDR loans on non-accrual status $ 2,525    
Number of TDR loans in the process of foreclosure (loan) | loan 2    
Loans classified as TDRs in process of foreclosure $ 350    
Number of mortgage loans in the process of foreclosure (loan) | loan 15 10  
Value of mortgage loans in the process of foreclosure $ 2,284 $ 1,101  
Unallocated      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of days past due 30 days 30 days