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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, 2023 | Dec. 31, 2022
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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 | $ 7,788 | $ 425,875
Average LTV, year one, originated in current fiscal year | 16.00% | 59.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 461,509 | $ 592,468
Average LTV, year two, originated in fiscal year before current fiscal year | 55.00% | 53.00%
Amortized cost, year three, originated two years before current fiscal year | $ 600,590 | $ 486,339
Average LTV, year three, originated two years before current fiscal year | 53.00% | 58.00%
Amortized cost, year four, originated three years before current fiscal year | $ 479,951 | $ 591,076
Average LTV, year four, originated three years before current fiscal year | 56.00% | 61.00%
Amortized cost, year five, originated four years before current fiscal year | $ 581,416 | $ 416,132
Average LTV, year five, originated four years before current fiscal year | 60.00% | 57.00%
Amortized cost, originated more than five years before current fiscal year | $ 1,432,653 | $ 1,042,668
Average LTV, originated more than five years before current fiscal year | 49.00% | 47.00%
Mortgage loans, amortized cost | $ 3,563,907 | $ 3,554,558
Total - Average LTV | 53.00% | 54.00%
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 | $ 249,328
Average LTV, year one, originated in current fiscal year | 0.00% | 63.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 279,353 | $ 257,746
Average LTV, year two, originated in fiscal year before current fiscal year | 62.00% | 61.00%
Amortized cost, year three, originated two years before current fiscal year | $ 239,049 | $ 421,391
Average LTV, year three, originated two years before current fiscal year | 60.00% | 57.00%
Amortized cost, year four, originated three years before current fiscal year | $ 394,892 | $ 429,596
Average LTV, year four, originated three years before current fiscal year | 56.00% | 58.00%
Amortized cost, year five, originated four years before current fiscal year | $ 434,390 | $ 325,117
Average LTV, year five, originated four years before current fiscal year | 58.00% | 53.00%
Amortized cost, originated more than five years before current fiscal year | $ 1,126,465 | $ 813,319
Average LTV, originated more than five years before current fiscal year | 46.00% | 44.00%
Mortgage loans, amortized cost | $ 2,474,149 | $ 2,496,497
Total - Average LTV | 52.00% | 53.00%
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 | $ 6,488
Average LTV, year one, originated in current fiscal year | 0.00% | 70.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 6,487 | $ 123,038
Average LTV, year two, originated in fiscal year before current fiscal year | 70.00% | 55.00%
Amortized cost, year three, originated two years before current fiscal year | $ 122,944 | $ 46,804
Average LTV, year three, originated two years before current fiscal year | 55.00% | 58.00%
Amortized cost, year four, originated three years before current fiscal year | $ 46,669 | $ 115,977
Average LTV, year four, originated three years before current fiscal year | 55.00% | 66.00%
Amortized cost, year five, originated four years before current fiscal year | $ 109,230 | $ 67,642
Average LTV, year five, originated four years before current fiscal year | 66.00% | 67.00%
Amortized cost, originated more than five years before current fiscal year | $ 204,897 | $ 145,703
Average LTV, originated more than five years before current fiscal year | 62.00% | 60.00%
Mortgage loans, amortized cost | $ 490,227 | $ 505,652
Total - Average LTV | 61.00% | 62.00%
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 | $ 7,788 | $ 170,059
Average LTV, year one, originated in current fiscal year | 16.00% | 52.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 175,669 | $ 211,684
Average LTV, year two, originated in fiscal year before current fiscal year | 43.00% | 43.00%
Amortized cost, year three, originated two years before current fiscal year | $ 211,652 | $ 18,144
Average LTV, year three, originated two years before current fiscal year | 43.00% | 79.00%
Amortized cost, year four, originated three years before current fiscal year | $ 38,390 | $ 39,396
Average LTV, year four, originated three years before current fiscal year | 60.00% | 73.00%
Amortized cost, year five, originated four years before current fiscal year | $ 31,739 | $ 10,348
Average LTV, year five, originated four years before current fiscal year | 52.00% | 76.00%
Amortized cost, originated more than five years before current fiscal year | $ 63,234 | $ 58,021
Average LTV, originated more than five years before current fiscal year | 50.00% | 47.00%
Mortgage loans, amortized cost | $ 528,472 | $ 507,652
Total - Average LTV | 47.00% | 51.00%
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 | $ 0
Average LTV, year two, originated in fiscal year before current fiscal year | 0.00% | 0.00%
Amortized cost, year three, originated two years before current fiscal year | $ 26,945 | $ 0
Average LTV, year three, originated two years before current fiscal year | 52.00% | 0.00%
Amortized cost, year four, originated three years before current fiscal year | $ 0 | $ 6,107
Average LTV, year four, originated three years before current fiscal year | 0.00% | 64.00%
Amortized cost, year five, originated four years before current fiscal year | $ 6,057 | $ 13,025
Average LTV, year five, originated four years before current fiscal year | 64.00% | 70.00%
Amortized cost, originated more than five years before current fiscal year | $ 38,057 | $ 25,625
Average LTV, originated more than five years before current fiscal year | 66.00% | 65.00%
Mortgage loans, amortized cost | $ 71,059 | $ 44,757
Total - Average LTV | 61.00% | 66.00%
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 | $ 41,988 | $ 196,347
Average LTV, year one, originated in current fiscal year | 59.00% | 51.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 195,288 | $ 160,641
Average LTV, year two, originated in fiscal year before current fiscal year | 51.00% | 48.00%
Amortized cost, year three, originated two years before current fiscal year | $ 158,366 | $ 169,346
Average LTV, year three, originated two years before current fiscal year | 52.00% | 37.00%
Amortized cost, year four, originated three years before current fiscal year | $ 172,036 | $ 5,629
Average LTV, year four, originated three years before current fiscal year | 44.00% | 41.00%
Amortized cost, year five, originated four years before current fiscal year | $ 5,589 | $ 34,000
Average LTV, year five, originated four years before current fiscal year | 24.00% | 31.00%
Amortized cost, originated more than five years before current fiscal year | $ 34,000 | $ 0
Average LTV, originated more than five years before current fiscal year | 42.00% | 0.00%
Mortgage loans, amortized cost | $ 607,267 | $ 565,963
Total - Average LTV | 49.00% | 45.00%
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 | $ 31,906 | $ 85,367
Average LTV, year one, originated in current fiscal year | 60.00% | 47.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 86,270 | $ 84,186
Average LTV, year two, originated in fiscal year before current fiscal year | 47.00% | 46.00%
Amortized cost, year three, originated two years before current fiscal year | $ 82,509 | $ 97,143
Average LTV, year three, originated two years before current fiscal year | 53.00% | 41.00%
Amortized cost, year four, originated three years before current fiscal year | $ 100,292 | $ 0
Average LTV, year four, originated three years before current fiscal year | 44.00% | 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 | $ 300,977 | $ 266,696
Total - Average LTV | 49.00% | 45.00%
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 | $ 10,082 | $ 107,856
Average LTV, year one, originated in current fiscal year | 58.00% | 54.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 105,916 | $ 67,630
Average LTV, year two, originated in fiscal year before current fiscal year | 54.00% | 52.00%
Amortized cost, year three, originated two years before current fiscal year | $ 67,170 | $ 61,103
Average LTV, year three, originated two years before current fiscal year | 53.00% | 32.00%
Amortized cost, year four, originated three years before current fiscal year | $ 60,643 | $ 0
Average LTV, year four, originated three years before current fiscal year | 45.00% | 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 | $ 243,811 | $ 236,589
Total - Average LTV | 52.00% | 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 | $ 0 | $ 3,124
Average LTV, year one, originated in current fiscal year | 0.00% | 56.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 3,102 | $ 8,825
Average LTV, year two, originated in fiscal year before current fiscal year | 56.00% | 38.00%
Amortized cost, year three, originated two years before current fiscal year | $ 8,687 | $ 3,125
Average LTV, year three, originated two years before current fiscal year | 39.00% | 25.00%
Amortized cost, year four, originated three years before current fiscal year | $ 3,125 | $ 0
Average LTV, year four, originated three years before current fiscal year | 29.00% | 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 | $ 14,914 | $ 15,074
Total - Average LTV | 41.00% | 39.00%
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 | $ 0
Average LTV, year two, originated in fiscal year before current fiscal year | 0.00% | 0.00%
Amortized cost, year three, originated two years before current fiscal year | $ 0 | $ 7,975
Average LTV, year three, originated two years before current fiscal year | 0.00% | 35.00%
Amortized cost, year four, originated three years before current fiscal year | $ 7,976 | $ 5,629
Average LTV, year four, originated three years before current fiscal year | 40.00% | 41.00%
Amortized cost, year five, originated four years before current fiscal year | $ 5,589 | $ 34,000
Average LTV, year five, originated four years before current fiscal year | 24.00% | 31.00%
Amortized cost, originated more than five years before current fiscal year | $ 34,000 | $ 0
Average LTV, originated more than five years before current fiscal year | 42.00% | 0.00%
Mortgage loans, amortized cost | $ 47,565 | $ 47,604
Total - Average LTV | 39.00% | 33.00%

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