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Mortgage Loans on Real Estate (Summary By Debt Service Coverage and Loan to Value Ratios) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Commercial Mortgage Loans |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Amortized cost, year one, originated in current fiscal year | $ 391,127 | $ 592,095
Average LTV, year one, originated in current fiscal year | 60.00% | 54.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 593,951 | $ 534,839
Average LTV, year two, originated in fiscal year before current fiscal year | 53.00% | 61.00%
Amortized cost, year three, originated two years before current fiscal year | $ 488,719 | $ 688,191
Average LTV, year three, originated two years before current fiscal year | 58.00% | 64.00%
Amortized cost, year four, originated three years before current fiscal year | $ 601,991 | $ 459,451
Average LTV, year four, originated three years before current fiscal year | 61.00% | 60.00%
Amortized cost, year five, originated four years before current fiscal year | $ 431,078 | $ 402,400
Average LTV, year five, originated four years before current fiscal year | 58.00% | 58.00%
Amortized cost, originated more than five years before current fiscal year | $ 1,076,726 | $ 951,526
Average LTV, originated more than five years before current fiscal year | 47.00% | 47.00%
Mortgage loans, amortized cost | $ 3,583,592 | $ 3,628,502
Total - Average LTV | 55.00% | 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, year one, originated in current fiscal year | $ 231,027 | $ 260,623
Average LTV, year one, originated in current fiscal year | 64.00% | 64.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 258,232 | $ 454,828
Average LTV, year two, originated in fiscal year before current fiscal year | 61.00% | 60.00%
Amortized cost, year three, originated two years before current fiscal year | $ 441,541 | $ 464,059
Average LTV, year three, originated two years before current fiscal year | 57.00% | 61.00%
Amortized cost, year four, originated three years before current fiscal year | $ 439,473 | $ 344,170
Average LTV, year four, originated three years before current fiscal year | 59.00% | 58.00%
Amortized cost, year five, originated four years before current fiscal year | $ 333,748 | $ 246,854
Average LTV, year five, originated four years before current fiscal year | 54.00% | 52.00%
Amortized cost, originated more than five years before current fiscal year | $ 840,846 | $ 758,494
Average LTV, originated more than five years before current fiscal year | 45.00% | 45.00%
Mortgage loans, amortized cost | $ 2,544,867 | $ 2,529,028
Total - Average LTV | 54.00% | 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, year one, originated in current fiscal year | $ 6,486 | $ 12,836
Average LTV, year one, originated in current fiscal year | 70.00% | 67.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 124,082 | $ 58,960
Average LTV, year two, originated in fiscal year before current fiscal year | 56.00% | 66.00%
Amortized cost, year three, originated two years before current fiscal year | $ 28,910 | $ 128,301
Average LTV, year three, originated two years before current fiscal year | 61.00% | 70.00%
Amortized cost, year four, originated three years before current fiscal year | $ 116,762 | $ 89,293
Average LTV, year four, originated three years before current fiscal year | 67.00% | 66.00%
Amortized cost, year five, originated four years before current fiscal year | $ 73,807 | $ 135,818
Average LTV, year five, originated four years before current fiscal year | 69.00% | 66.00%
Amortized cost, originated more than five years before current fiscal year | $ 147,784 | $ 129,833
Average LTV, originated more than five years before current fiscal year | 60.00% | 57.00%
Mortgage loans, amortized cost | $ 497,831 | $ 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, year one, originated in current fiscal year | $ 100,177 | $ 318,636
Average LTV, year one, originated in current fiscal year | 52.00% | 45.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 211,637 | $ 17,762
Average LTV, year two, originated in fiscal year before current fiscal year | 43.00% | 82.00%
Amortized cost, year three, originated two years before current fiscal year | $ 18,268 | $ 69,684
Average LTV, year three, originated two years before current fiscal year | 80.00% | 72.00%
Amortized cost, year four, originated three years before current fiscal year | $ 39,603 | $ 11,937
Average LTV, year four, originated three years before current fiscal year | 74.00% | 75.00%
Amortized cost, year five, originated four years before current fiscal year | $ 10,404 | $ 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 | $ 60,019 | $ 42,125
Average LTV, originated more than five years before current fiscal year | 47.00% | 58.00%
Mortgage loans, amortized cost | $ 440,108 | $ 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, year one, originated in current fiscal year | $ 53,437 | $ 0
Average LTV, year one, originated in current fiscal year | 54.00% | 0.00%
Amortized cost, year two, 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, year three, 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, year four, originated three years before current fiscal year | $ 6,153 | $ 14,051
Average LTV, year four, originated three years before current fiscal year | 61.00% | 76.00%
Amortized cost, year five, originated four years before current fiscal year | $ 13,119 | $ 13,385
Average LTV, year five, originated four years before current fiscal year | 73.00% | 73.00%
Amortized cost, originated more than five years before current fiscal year | $ 28,077 | $ 21,074
Average LTV, originated more than five years before current fiscal year | 67.00% | 54.00%
Mortgage loans, amortized cost | $ 100,786 | $ 77,946
Total - Average LTV | 61.00% | 65.00%
Agricultural Mortgage Loans |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Amortized cost, year one, originated in current fiscal year | $ 188,916 | $ 165,764
Average LTV, year one, originated in current fiscal year | 52.00% | 54.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 158,513 | $ 196,521
Average LTV, year two, originated in fiscal year before current fiscal year | 53.00% | 49.00%
Amortized cost, year three, originated two years before current fiscal year | $ 193,598 | $ 19,714
Average LTV, year three, originated two years before current fiscal year | 53.00% | 45.00%
Amortized cost, year four, originated three years before current fiscal year | $ 5,768 | $ 25,000
Average LTV, year four, originated three years before current fiscal year | 24.00% | 11.00%
Amortized cost, year five, originated four years before current fiscal year | $ 34,000 | $ 0
Average LTV, year five, originated four years before current fiscal year | 42.00% | 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 | $ 580,795 | $ 406,999
Total - Average LTV | 52.00% | 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, year one, originated in current fiscal year | $ 85,660 | $ 62,548
Average LTV, year one, originated in current fiscal year | 48.00% | 54.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 54,509 | $ 80,919
Average LTV, year two, originated in fiscal year before current fiscal year | 51.00% | 56.00%
Amortized cost, year three, originated two years before current fiscal year | $ 83,847 | $ 11,645
Average LTV, year three, originated two years before current fiscal year | 67.00% | 49.00%
Amortized cost, year four, originated three years before current fiscal year | $ 1,421 | $ 25,000
Average LTV, year four, originated three years before current fiscal year | 42.00% | 11.00%
Amortized cost, year five, originated four years before current fiscal year | $ 34,000 | $ 0
Average LTV, year five, originated four years before current fiscal year | 42.00% | 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 | $ 259,437 | $ 180,112
Total - Average LTV | 54.00% | 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, year one, originated in current fiscal year | $ 96,443 | $ 95,738
Average LTV, year one, originated in current fiscal year | 54.00% | 55.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 96,648 | $ 102,958
Average LTV, year two, originated in fiscal year before current fiscal year | 54.00% | 43.00%
Amortized cost, year three, originated two years before current fiscal year | $ 99,008 | $ 3,335
Average LTV, year three, originated two years before current fiscal year | 42.00% | 22.00%
Amortized cost, year four, originated three years before current fiscal year | $ 4,347 | $ 0
Average LTV, year four, originated three years before current fiscal year | 18.00% | 0.00%
Amortized cost, year five, 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 | $ 296,446 | $ 202,031
Total - Average LTV | 50.00% | 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, year one, originated in current fiscal year | $ 6,813 | $ 7,478
Average LTV, year one, originated in current fiscal year | 74.00% | 44.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 7,356 | $ 4,092
Average LTV, year two, originated in fiscal year before current fiscal year | 43.00% | 36.00%
Amortized cost, year three, originated two years before current fiscal year | $ 4,042 | $ 4,734
Average LTV, year three, originated two years before current fiscal year | 36.00% | 50.00%
Amortized cost, year four, 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, year five, 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 | $ 18,211 | $ 16,304
Total - Average LTV | 53.00% | 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, year one, originated in current fiscal year | $ 0 | $ 0
Average LTV, year one, originated in current fiscal year | 0.00% | 0.00%
Amortized cost, year two, 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, year three, originated two years before current fiscal year | $ 6,701 | $ 0
Average LTV, year three, originated two years before current fiscal year | 46.00% | 0.00%
Amortized cost, year four, 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, year five, 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 | $ 6,701 | $ 8,552
Total - Average LTV | 46.00% | 59.00%

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