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Mortgage Loans on Real Estate (Summary By Debt Service Coverage and Loan to Value Ratios) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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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 | $ 0 | $ 44,171
Average LTV, year one, originated in current fiscal year | 0.00% | 39.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 30,600 | $ 520,651
Average LTV, year two, originated in fiscal year before current fiscal year | 35.00% | 53.00%
Amortized cost, year three, originated two years before current fiscal year | $ 506,879 | $ 632,843
Average LTV, year three, originated two years before current fiscal year | 53.00% | 51.00%
Amortized cost, year four, originated three years before current fiscal year | $ 631,863 | $ 435,768
Average LTV, year four, originated three years before current fiscal year | 51.00% | 52.00%
Amortized cost, year five, originated four years before current fiscal year | $ 423,814 | $ 560,750
Average LTV, year five, originated four years before current fiscal year | 51.00% | 57.00%
Amortized cost, originated more than five years before current fiscal year | $ 1,882,453 | $ 1,350,816
Average LTV, originated more than five years before current fiscal year | 50.00% | 47.00%
Mortgage loans, amortized cost | $ 3,475,609 | $ 3,544,999
Total - Average LTV | 51.00% | 51.00%
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 | $ 0 | $ 3,444
Average LTV, year one, originated in current fiscal year | 0.00% | 46.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 3,456 | $ 285,481
Average LTV, year two, originated in fiscal year before current fiscal year | 46.00% | 62.00%
Amortized cost, year three, originated two years before current fiscal year | $ 285,438 | $ 272,661
Average LTV, year three, originated two years before current fiscal year | 62.00% | 57.00%
Amortized cost, year four, originated three years before current fiscal year | $ 271,985 | $ 370,299
Average LTV, year four, originated three years before current fiscal year | 57.00% | 51.00%
Amortized cost, year five, originated four years before current fiscal year | $ 348,016 | $ 449,973
Average LTV, year five, originated four years before current fiscal year | 50.00% | 55.00%
Amortized cost, originated more than five years before current fiscal year | $ 1,479,369 | $ 1,056,159
Average LTV, originated more than five years before current fiscal year | 47.00% | 44.00%
Mortgage loans, amortized cost | $ 2,388,264 | $ 2,438,017
Total - Average LTV | 50.00% | 50.00%
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 | $ 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 | $ 76,122
Average LTV, year two, originated in fiscal year before current fiscal year | 0.00% | 49.00%
Amortized cost, year three, originated two years before current fiscal year | $ 81,084 | $ 4,500
Average LTV, year three, originated two years before current fiscal year | 48.00% | 55.00%
Amortized cost, year four, originated three years before current fiscal year | $ 4,453 | $ 36,534
Average LTV, year four, originated three years before current fiscal year | 54.00% | 57.00%
Amortized cost, year five, originated four years before current fiscal year | $ 27,150 | $ 108,232
Average LTV, year five, originated four years before current fiscal year | 52.00% | 64.00%
Amortized cost, originated more than five years before current fiscal year | $ 282,786 | $ 177,489
Average LTV, originated more than five years before current fiscal year | 60.00% | 57.00%
Mortgage loans, amortized cost | $ 395,473 | $ 402,877
Total - Average LTV | 57.00% | 58.00%
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 | $ 0 | $ 40,727
Average LTV, year one, originated in current fiscal year | 0.00% | 38.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 27,144 | $ 105,578
Average LTV, year two, originated in fiscal year before current fiscal year | 33.00% | 32.00%
Amortized cost, year three, originated two years before current fiscal year | $ 86,871 | $ 328,722
Average LTV, year three, originated two years before current fiscal year | 29.00% | 45.00%
Amortized cost, year four, originated three years before current fiscal year | $ 328,457 | $ 28,935
Average LTV, year four, originated three years before current fiscal year | 45.00% | 54.00%
Amortized cost, year five, originated four years before current fiscal year | $ 30,270 | $ 0
Average LTV, year five, originated four years before current fiscal year | 56.00% | 0.00%
Amortized cost, originated more than five years before current fiscal year | $ 63,302 | $ 63,972
Average LTV, originated more than five years before current fiscal year | 71.00% | 71.00%
Mortgage loans, amortized cost | $ 536,044 | $ 567,934
Total - Average LTV | 46.00% | 46.00%
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 | $ 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 | $ 53,470
Average LTV, year two, originated in fiscal year before current fiscal year | 0.00% | 54.00%
Amortized cost, year three, originated two years before current fiscal year | $ 53,486 | $ 26,960
Average LTV, year three, originated two years before current fiscal year | 54.00% | 52.00%
Amortized cost, year four, originated three years before current fiscal year | $ 26,968 | $ 0
Average LTV, year four, originated three years before current fiscal year | 52.00% | 0.00%
Amortized cost, year five, originated four years before current fiscal year | $ 18,378 | $ 2,545
Average LTV, year five, originated four years before current fiscal year | 54.00% | 80.00%
Amortized cost, originated more than five years before current fiscal year | $ 56,996 | $ 53,196
Average LTV, originated more than five years before current fiscal year | 63.00% | 52.00%
Mortgage loans, amortized cost | $ 155,828 | $ 136,171
Total - Average LTV | 57.00% | 53.00%
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 | $ 897 | $ 48,676
Average LTV, year one, originated in current fiscal year | 36.00% | 58.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 48,608 | $ 192,677
Average LTV, year two, originated in fiscal year before current fiscal year | 58.00% | 51.00%
Amortized cost, year three, originated two years before current fiscal year | $ 190,478 | $ 133,639
Average LTV, year three, originated two years before current fiscal year | 50.00% | 54.00%
Amortized cost, year four, originated three years before current fiscal year | $ 132,286 | $ 168,500
Average LTV, year four, originated three years before current fiscal year | 53.00% | 44.00%
Amortized cost, year five, originated four years before current fiscal year | $ 166,189 | $ 2,141
Average LTV, year five, originated four years before current fiscal year | 44.00% | 33.00%
Amortized cost, originated more than five years before current fiscal year | $ 36,127 | $ 34,000
Average LTV, originated more than five years before current fiscal year | 41.00% | 42.00%
Mortgage loans, amortized cost | $ 574,585 | $ 579,633
Total - Average LTV | 49.00% | 49.00%
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 | $ 0 | $ 26,890
Average LTV, year one, originated in current fiscal year | 0.00% | 59.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 26,865 | $ 61,374
Average LTV, year two, originated in fiscal year before current fiscal year | 59.00% | 54.00%
Amortized cost, year three, originated two years before current fiscal year | $ 61,331 | $ 46,060
Average LTV, year three, originated two years before current fiscal year | 53.00% | 57.00%
Amortized cost, year four, originated three years before current fiscal year | $ 45,598 | $ 91,060
Average LTV, year four, originated three years before current fiscal year | 56.00% | 46.00%
Amortized cost, year five, originated four years before current fiscal year | $ 90,066 | $ 0
Average LTV, year five, originated four years before current fiscal year | 45.00% | 0.00%
Amortized cost, originated more than five years before current fiscal year | $ 34,000 | $ 34,000
Average LTV, originated more than five years before current fiscal year | 42.00% | 42.00%
Mortgage loans, amortized cost | $ 257,860 | $ 259,384
Total - Average LTV | 50.00% | 50.00%
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 | $ 0 | $ 17,798
Average LTV, year one, originated in current fiscal year | 0.00% | 59.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 17,755 | $ 89,548
Average LTV, year two, originated in fiscal year before current fiscal year | 59.00% | 54.00%
Amortized cost, year three, originated two years before current fiscal year | $ 88,146 | $ 51,819
Average LTV, year three, originated two years before current fiscal year | 53.00% | 52.00%
Amortized cost, year four, originated three years before current fiscal year | $ 51,510 | $ 27,433
Average LTV, year four, originated three years before current fiscal year | 51.00% | 32.00%
Amortized cost, year five, originated four years before current fiscal year | $ 26,352 | $ 0
Average LTV, year five, originated four years before current fiscal year | 34.00% | 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 | $ 183,763 | $ 186,598
Total - Average LTV | 50.00% | 51.00%
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 | $ 897 | $ 3,988
Average LTV, year one, originated in current fiscal year | 36.00% | 43.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 3,988 | $ 3,080
Average LTV, year two, originated in fiscal year before current fiscal year | 43.00% | 55.00%
Amortized cost, year three, originated two years before current fiscal year | $ 3,058 | $ 9,246
Average LTV, year three, originated two years before current fiscal year | 55.00% | 57.00%
Amortized cost, year four, originated three years before current fiscal year | $ 9,224 | $ 902
Average LTV, year four, originated three years before current fiscal year | 57.00% | 59.00%
Amortized cost, year five, originated four years before current fiscal year | $ 894 | $ 0
Average LTV, year five, originated four years before current fiscal year | 58.00% | 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 | $ 18,061 | $ 17,216
Total - Average LTV | 52.00% | 53.00%
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 | $ 38,675
Average LTV, year two, originated in fiscal year before current fiscal year | 0.00% | 37.00%
Amortized cost, year three, originated two years before current fiscal year | $ 37,943 | $ 26,514
Average LTV, year three, originated two years before current fiscal year | 36.00% | 51.00%
Amortized cost, year four, originated three years before current fiscal year | $ 25,954 | $ 49,105
Average LTV, year four, originated three years before current fiscal year | 50.00% | 48.00%
Amortized cost, year five, originated four years before current fiscal year | $ 48,877 | $ 2,141
Average LTV, year five, originated four years before current fiscal year | 48.00% | 33.00%
Amortized cost, originated more than five years before current fiscal year | $ 2,127 | $ 0
Average LTV, originated more than five years before current fiscal year | 33.00% | 0.00%
Mortgage loans, amortized cost | $ 114,901 | $ 116,435
Total - Average LTV | 44.00% | 45.00%

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