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Mortgage Loans on Real Estate (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
portfolio_segment
loans
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
loans
Loans and Leases Receivable Disclosure [Line Items]      
Number of portfolio segments that make up financing receivables | portfolio_segment 1    
Allowance for credit loss, economic factors forecast period, years 2 years    
Real estate owned $ 0 $ 0  
Impaired mortgage loans, workout terms, interest only payments, six month terms 6 months    
Impaired mortgage loans, workout terms, interest only payments, twelve month terms 12 months    
Impaired mortgage loans, workout terms, cash flow sweep, number of months 12 months    
Interest income recognized on non-accrual loans $ 0 $ 0  
Financing receivable, modifications, period of time of delaying principal and/or interest, months 3 months    
Minimum      
Loans and Leases Receivable Disclosure [Line Items]      
Number of days past due, delinquent status 60 days    
Number of days past due, non-accrual status 90 days    
Commercial Real Estate Portfolio Segment      
Loans and Leases Receivable Disclosure [Line Items]      
Commitments outstanding $ 247,500    
Non-accrual loans $ 0   $ 0
Number of TDRs | loans 0   0