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Mortgage Loans on Real Estate (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
portfolio_segment
loans
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
loans
Loans and Leases Receivable Disclosure [Line Items]      
Number of portfolio segments that make up financing receivables | portfolio_segment 3    
Commitments outstanding $ 110,900    
Real estate owned $ 0 $ 0  
Non-accrual status, number of loans | loans 3   1
Interest income recognized on non-accrual loans $ 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    
Collateral dependent loans 0   $ 0
Residential Mortgage Loans      
Loans and Leases Receivable Disclosure [Line Items]      
Accrued interest receivable written off 0    
Collateral dependent loans 0   0
Agricultural      
Loans and Leases Receivable Disclosure [Line Items]      
Accrued interest receivable written off 0    
Collateral dependent loans $ 0   $ 0