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Mortgage Loans on Real Estate (Rollforward of Valuation Allowance on Mortgage Loan Portfolios) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance balance $ (28,514) $ (19,776) $ (31,029) $ (17,779)
Charge-offs 0 1,485 0 1,485
Recoveries 0 712 0 712
Change in provision for credit losses 1,933 (2,510) 4,448 (4,507)
Ending allowance balance (26,581) (20,089) (26,581) (20,089)
Commercial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance balance (26,139) (19,604) (25,529) (17,579)
Charge-offs 0 1,485 0 1,485
Recoveries 0 712 0 712
Change in provision for credit losses 3,641 (712) 3,031 (2,737)
Ending allowance balance (22,498) (18,119) (22,498) (18,119)
Agricultural        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance balance (439) (172) (2,130) (200)
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Change in provision for credit losses (15) (148) 1,676 (120)
Ending allowance balance (454) (320) (454) (320)
Residential        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning allowance balance (1,936) 0 (3,370) 0
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Change in provision for credit losses (1,693) (1,650) (259) (1,650)
Ending allowance balance $ (3,629) $ (1,650) $ (3,629) $ (1,650)