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Mortgage Loans on Real Estate (Summary By Debt Service Coverage and Loan to Value Ratios) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Commercial Mortgage Loans    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 425,875 $ 592,095
Average LTV, year one, originated in current fiscal year 59.00% 54.00%
Amortized cost, originated in fiscal year before current fiscal year $ 592,468 $ 534,839
Average LTV, year two, originated in fiscal year before current fiscal year 53.00% 61.00%
Amortized cost, originated two years before current fiscal year $ 486,339 $ 688,191
Average LTV, year three, originated two years before current fiscal year 58.00% 64.00%
Amortized cost, originated three years before current fiscal year $ 591,076 $ 459,451
Average LTV, year four, originated three years before current fiscal year 61.00% 60.00%
Amortized cost, originated four years before current fiscal year $ 416,132 $ 402,400
Average LTV, year five, originated four years before current fiscal year 57.00% 58.00%
Amortized cost, originated more than five years before current fiscal year $ 1,042,668 $ 951,526
Average LTV, originated more than five years before current fiscal year 47.00% 47.00%
Mortgage loans, amortized cost $ 3,554,558 $ 3,628,502
Total - Average LTV 54.00% 56.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.5    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 249,328 $ 260,623
Average LTV, year one, originated in current fiscal year 63.00% 64.00%
Amortized cost, originated in fiscal year before current fiscal year $ 257,746 $ 454,828
Average LTV, year two, originated in fiscal year before current fiscal year 61.00% 60.00%
Amortized cost, originated two years before current fiscal year $ 421,391 $ 464,059
Average LTV, year three, originated two years before current fiscal year 57.00% 61.00%
Amortized cost, originated three years before current fiscal year $ 429,596 $ 344,170
Average LTV, year four, originated three years before current fiscal year 58.00% 58.00%
Amortized cost, originated four years before current fiscal year $ 325,117 $ 246,854
Average LTV, year five, originated four years before current fiscal year 53.00% 52.00%
Amortized cost, originated more than five years before current fiscal year $ 813,319 $ 758,494
Average LTV, originated more than five years before current fiscal year 44.00% 45.00%
Mortgage loans, amortized cost $ 2,496,497 $ 2,529,028
Total - Average LTV 53.00% 55.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.2 and Less Than 1.5    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 6,488 $ 12,836
Average LTV, year one, originated in current fiscal year 70.00% 67.00%
Amortized cost, originated in fiscal year before current fiscal year $ 123,038 $ 58,960
Average LTV, year two, originated in fiscal year before current fiscal year 55.00% 66.00%
Amortized cost, originated two years before current fiscal year $ 46,804 $ 128,301
Average LTV, year three, originated two years before current fiscal year 58.00% 70.00%
Amortized cost, originated three years before current fiscal year $ 115,977 $ 89,293
Average LTV, year four, originated three years before current fiscal year 66.00% 66.00%
Amortized cost, originated four years before current fiscal year $ 67,642 $ 135,818
Average LTV, year five, originated four years before current fiscal year 67.00% 66.00%
Amortized cost, originated more than five years before current fiscal year $ 145,703 $ 129,833
Average LTV, originated more than five years before current fiscal year 60.00% 57.00%
Mortgage loans, amortized cost $ 505,652 $ 555,041
Total - Average LTV 62.00% 65.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.0 and Less Than 1.2    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 170,059 $ 318,636
Average LTV, year one, originated in current fiscal year 52.00% 45.00%
Amortized cost, originated in fiscal year before current fiscal year $ 211,684 $ 17,762
Average LTV, year two, originated in fiscal year before current fiscal year 43.00% 82.00%
Amortized cost, originated two years before current fiscal year $ 18,144 $ 69,684
Average LTV, year three, originated two years before current fiscal year 79.00% 72.00%
Amortized cost, originated three years before current fiscal year $ 39,396 $ 11,937
Average LTV, year four, originated three years before current fiscal year 73.00% 75.00%
Amortized cost, originated four years before current fiscal year $ 10,348 $ 6,343
Average LTV, year five, originated four years before current fiscal year 76.00% 60.00%
Amortized cost, originated more than five years before current fiscal year $ 58,021 $ 42,125
Average LTV, originated more than five years before current fiscal year 47.00% 58.00%
Mortgage loans, amortized cost $ 507,652 $ 466,487
Total - Average LTV 51.00% 53.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Less Than 1.0    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 0 $ 0
Average LTV, year one, originated in current fiscal year 0.00% 0.00%
Amortized cost, originated in fiscal year before current fiscal year $ 0 $ 3,289
Average LTV, year two, originated in fiscal year before current fiscal year 0.00% 61.00%
Amortized cost, originated two years before current fiscal year $ 0 $ 26,147
Average LTV, year three, originated two years before current fiscal year 0.00% 63.00%
Amortized cost, originated three years before current fiscal year $ 6,107 $ 14,051
Average LTV, year four, originated three years before current fiscal year 64.00% 76.00%
Amortized cost, originated four years before current fiscal year $ 13,025 $ 13,385
Average LTV, year five, originated four years before current fiscal year 70.00% 73.00%
Amortized cost, originated more than five years before current fiscal year $ 25,625 $ 21,074
Average LTV, originated more than five years before current fiscal year 65.00% 54.00%
Mortgage loans, amortized cost $ 44,757 $ 77,946
Total - Average LTV 66.00% 65.00%
Agricultural Mortgage Loans    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 196,347 $ 165,764
Average LTV, year one, originated in current fiscal year 51.00% 54.00%
Amortized cost, originated in fiscal year before current fiscal year $ 160,641 $ 196,521
Average LTV, year two, originated in fiscal year before current fiscal year 48.00% 49.00%
Amortized cost, originated two years before current fiscal year $ 169,346 $ 19,714
Average LTV, year three, originated two years before current fiscal year 37.00% 45.00%
Amortized cost, originated three years before current fiscal year $ 5,629 $ 25,000
Average LTV, year four, originated three years before current fiscal year 41.00% 11.00%
Amortized cost, originated four years before current fiscal year $ 34,000 $ 0
Average LTV, year five, originated four years before current fiscal year 31.00% 0.00%
Amortized cost, originated more than five years before current fiscal year $ 0 $ 0
Average LTV, originated more than five years before current fiscal year 0.00% 0.00%
Mortgage loans, amortized cost $ 565,963 $ 406,999
Total - Average LTV 45.00% 48.00%
Agricultural Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.5    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 85,367 $ 62,548
Average LTV, year one, originated in current fiscal year 47.00% 54.00%
Amortized cost, originated in fiscal year before current fiscal year $ 84,186 $ 80,919
Average LTV, year two, originated in fiscal year before current fiscal year 46.00% 56.00%
Amortized cost, originated two years before current fiscal year $ 97,143 $ 11,645
Average LTV, year three, originated two years before current fiscal year 41.00% 49.00%
Amortized cost, originated three years before current fiscal year $ 0 $ 25,000
Average LTV, year four, originated three years before current fiscal year 0.00% 11.00%
Amortized cost, originated four years before current fiscal year $ 0 $ 0
Average LTV, year five, originated four years before current fiscal year 0.00% 0.00%
Amortized cost, originated more than five years before current fiscal year $ 0 $ 0
Average LTV, originated more than five years before current fiscal year 0.00% 0.00%
Mortgage loans, amortized cost $ 266,696 $ 180,112
Total - Average LTV 45.00% 49.00%
Agricultural Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.2 and Less Than 1.5    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 107,856 $ 95,738
Average LTV, year one, originated in current fiscal year 54.00% 55.00%
Amortized cost, originated in fiscal year before current fiscal year $ 67,630 $ 102,958
Average LTV, year two, originated in fiscal year before current fiscal year 52.00% 43.00%
Amortized cost, originated two years before current fiscal year $ 61,103 $ 3,335
Average LTV, year three, originated two years before current fiscal year 32.00% 22.00%
Amortized cost, originated three years before current fiscal year $ 0 $ 0
Average LTV, year four, originated three years before current fiscal year 0.00% 0.00%
Amortized cost, originated four years before current fiscal year $ 0 $ 0
Average LTV, year five, originated four years before current fiscal year 0.00% 0.00%
Amortized cost, originated more than five years before current fiscal year $ 0 $ 0
Average LTV, originated more than five years before current fiscal year 0.00% 0.00%
Mortgage loans, amortized cost $ 236,589 $ 202,031
Total - Average LTV 48.00% 48.00%
Agricultural Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.0 and Less Than 1.2    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 3,124 $ 7,478
Average LTV, year one, originated in current fiscal year 56.00% 44.00%
Amortized cost, originated in fiscal year before current fiscal year $ 8,825 $ 4,092
Average LTV, year two, originated in fiscal year before current fiscal year 38.00% 36.00%
Amortized cost, originated two years before current fiscal year $ 3,125 $ 4,734
Average LTV, year three, originated two years before current fiscal year 25.00% 50.00%
Amortized cost, originated three years before current fiscal year $ 0 $ 0
Average LTV, year four, originated three years before current fiscal year 0.00% 0.00%
Amortized cost, originated four years before current fiscal year $ 0 $ 0
Average LTV, year five, originated four years before current fiscal year 0.00% 0.00%
Amortized cost, originated more than five years before current fiscal year $ 0 $ 0
Average LTV, originated more than five years before current fiscal year 0.00% 0.00%
Mortgage loans, amortized cost $ 15,074 $ 16,304
Total - Average LTV 39.00% 44.00%
Agricultural Mortgage Loans | Debt Service Coverage Ratio: Less Than 1.0    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 0 $ 0
Average LTV, year one, originated in current fiscal year 0.00% 0.00%
Amortized cost, originated in fiscal year before current fiscal year $ 0 $ 8,552
Average LTV, year two, originated in fiscal year before current fiscal year 0.00% 59.00%
Amortized cost, originated two years before current fiscal year $ 7,975 $ 0
Average LTV, year three, originated two years before current fiscal year 35.00% 0.00%
Amortized cost, originated three years before current fiscal year $ 5,629 $ 0
Average LTV, year four, originated three years before current fiscal year 41.00% 0.00%
Amortized cost, originated four years before current fiscal year $ 34,000 $ 0
Average LTV, year five, originated four years before current fiscal year 31.00% 0.00%
Amortized cost, originated more than five years before current fiscal year $ 0 $ 0
Average LTV, originated more than five years before current fiscal year 0.00% 0.00%
Mortgage loans, amortized cost $ 47,604 $ 8,552
Total - Average LTV 33.00% 59.00%