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Mortgage Loans on Real Estate (Rollforward of Valuation Allowance on Mortgage Loan Portfolios) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning allowance balance $ (31,029) $ (17,779) [1]
Charge-offs 0 1,485
Recoveries 0 712
Change in provision for credit losses 7,005 (15,447)
Ending allowance balance (24,024) (31,029)
Commercial Mortgage Loans    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning allowance balance (25,529) (17,579) [1]
Charge-offs 0 1,485
Recoveries 0 712
Change in provision for credit losses 7,603 (10,147)
Ending allowance balance (17,926) (25,529)
Agricultural Mortgage Loans    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning allowance balance (2,130) (200) [1]
Charge-offs 0 0
Recoveries 0 0
Change in provision for credit losses 1,611 (1,930)
Ending allowance balance (519) (2,130)
Residential Mortgage Loans    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning allowance balance (3,370) 0 [1]
Charge-offs 0 0
Recoveries 0 0
Change in provision for credit losses (2,209) (3,370)
Ending allowance balance $ (5,579) $ (3,370)
[1] Upon adoption of authoritative guidance effective January 1, 2020, we updated our accounting policies and methodology for calculating the general loan loss allowance, resulting in an adjustment to our mortgage loan valuation allowance. See Note 1 - Significant Accounting Policies for further details.