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Mortgage Loans on Real Estate (Rollforward of Valuation Allowance on Mortgage Loan Portfolios) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Beginning allowance balance $ (32,388) $ (26,581) $ (24,024) $ (31,029)
Charge-offs 414 0 414 0
Recoveries 1,086 0 1,315 0
Change in provision for credit losses (4,716) 5,023 (13,309) 9,471
Ending allowance balance (35,604) (21,558) (35,604) (21,558)
Commercial        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Beginning allowance balance (24,244) (22,498) (17,926) (25,529)
Charge-offs 414 0 414 0
Recoveries 1,086 0 1,315 0
Change in provision for credit losses (869) 4,808 (7,416) 7,839
Ending allowance balance (23,613) (17,690) (23,613) (17,690)
Agricultural        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Beginning allowance balance (664) (454) (519) (2,130)
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Change in provision for credit losses (146) (174) (291) 1,502
Ending allowance balance (810) (628) (810) (628)
Residential        
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]        
Beginning allowance balance (7,480) (3,629) (5,579) (3,370)
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Change in provision for credit losses (3,701) 389 (5,602) 130
Ending allowance balance $ (11,181) $ (3,240) $ (11,181) $ (3,240)