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Mortgage Loans on Real Estate (Rollforward of Valuation Allowance on Mortgage Loan Portfolios) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning allowance balance (1) $ (9,179)
Charge-offs 1,485
Recoveries 712
Change in provision for credit losses (15,447)
Ending allowance balance (31,029)
Commercial Mortgage Loans  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning allowance balance (1) (8,979)
Charge-offs 1,485
Recoveries 712
Change in provision for credit losses (10,147)
Ending allowance balance (25,529)
Agricultural Mortgage Loans  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning allowance balance (1) (200)
Charge-offs 0
Recoveries 0
Change in provision for credit losses (1,930)
Ending allowance balance (2,130)
Residential Mortgage Loans  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning allowance balance (1) 0
Charge-offs 0
Recoveries 0
Change in provision for credit losses (3,370)
Ending allowance balance $ (3,370)