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Mortgage Loans on Real Estate (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
loans
portfolio_segment
Dec. 31, 2018
USD ($)
loans
Dec. 31, 2017
USD ($)
Receivables [Abstract]      
Number of portfolio segments that make up financing receivables | portfolio_segment 1    
Real estate owned $ 0 $ 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    
Number of days past due, non-accrual status 90 days    
Non-accrual loans $ 0 $ 0  
Financing receivable, modifications, period of time of delaying principal and/or interest, months 3 months    
Number of TDRs | loans 0 0  
Minimum      
Loans and Leases Receivable Disclosure [Line Items]      
Number of days past due, delinquent status 60 days    
Commercial Real Estate Portfolio Segment      
Loans and Leases Receivable Disclosure [Line Items]      
Commitments outstanding $ 244,300