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Mortgage Loans on Real Estate (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
portfolio_segment
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
portfolio_segment
loans
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
loans
Loans and Leases Receivable Disclosure [Line Items]          
Number of portfolio segments that make up financing receivables | portfolio_segment 2   2    
Commitments outstanding $ 106,100   $ 106,100    
Allowance for credit loss, economic factors forecast period, years     2 years    
Real estate owned 0 $ 0 $ 0 $ 0  
Non-accrual loans 0   0   $ 0
Interest income recognized on non-accrual loans 0 $ 0 $ 0 $ 0  
Financing receivable, modifications, period of time of delaying principal and/or interest     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    
Number of days past due, non-accrual status     90 days    
Commercial Mortgage Loans          
Loans and Leases Receivable Disclosure [Line Items]          
Accrued interest receivable written off 0   $ 0    
Collateral dependent loans 0   0   $ 0
Residential Mortgage Loans          
Loans and Leases Receivable Disclosure [Line Items]          
Accrued interest receivable written off 0   0    
Collateral dependent loans $ 0   $ 0   $ 0