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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, 2021 | Dec. 31, 2020
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Commercial Mortgage Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | $ 128,981 | $ 543,991
Average LTV, year one, originated in current fiscal year | 67.00% | 65.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 537,879 | $ 755,584
Average LTV, year two, originated in fiscal year before current fiscal year | 63.00% | 67.00%
Amortized cost, year three, originated two years before current fiscal year | $ 751,659 | $ 527,670
Average LTV, year three, originated two years before current fiscal year | 64.00% | 64.00%
Amortized cost, year four, originated three years before current fiscal year | $ 462,393 | $ 459,055
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 | $ 409,611 | $ 411,834
Average LTV, year five, originated four years before current fiscal year | 59.00% | 55.00%
Amortized cost, originated more than five years before current fiscal year | $ 1,033,461 | $ 880,754
Average LTV, originated more than five years before current fiscal year | 48.00% | 49.00%
Mortgage loans, amortized cost | $ 3,323,984 | $ 3,578,888
Total - Average LTV | 58.00% | 59.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | $ 115,988 | $ 364,574
Average LTV, year one, originated in current fiscal year | 67.00% | 63.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 457,059 | $ 442,370
Average LTV, year two, originated in fiscal year before current fiscal year | 61.00% | 66.00%
Amortized cost, year three, originated two years before current fiscal year | $ 529,625 | $ 399,193
Average LTV, year three, originated two years before current fiscal year | 62.00% | 62.00%
Amortized cost, year four, originated three years before current fiscal year | $ 342,347 | $ 316,738
Average LTV, year four, originated three years before current fiscal year | 59.00% | 57.00%
Amortized cost, year five, originated four years before current fiscal year | $ 252,749 | $ 359,321
Average LTV, year five, originated four years before current fiscal year | 53.00% | 54.00%
Amortized cost, originated more than five years before current fiscal year | $ 804,604 | $ 715,706
Average LTV, originated more than five years before current fiscal year | 45.00% | 47.00%
Mortgage loans, amortized cost | $ 2,502,372 | $ 2,597,902
Total - Average LTV | 55.00% | 57.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.2 and Less Than 1.5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | $ 12,993 | $ 161,779
Average LTV, year one, originated in current fiscal year | 68.00% | 66.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 59,575 | $ 226,166
Average LTV, year two, originated in fiscal year before current fiscal year | 66.00% | 70.00%
Amortized cost, year three, originated two years before current fiscal year | $ 129,356 | $ 124,267
Average LTV, year three, originated two years before current fiscal year | 68.00% | 72.00%
Amortized cost, year four, originated three years before current fiscal year | $ 89,987 | $ 124,564
Average LTV, year four, originated three years before current fiscal year | 67.00% | 67.00%
Amortized cost, year five, originated four years before current fiscal year | $ 136,948 | $ 52,513
Average LTV, year five, originated four years before current fiscal year | 68.00% | 62.00%
Amortized cost, originated more than five years before current fiscal year | $ 155,276 | $ 111,690
Average LTV, originated more than five years before current fiscal year | 56.00% | 55.00%
Mortgage loans, amortized cost | $ 584,135 | $ 800,979
Total - Average LTV | 64.00% | 66.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.0 and Less Than 1.2 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | $ 0 | $ 17,638
Average LTV, year one, originated in current fiscal year | 0.00% | 82.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 21,245 | $ 22,917
Average LTV, year two, originated in fiscal year before current fiscal year | 79.00% | 67.00%
Amortized cost, year three, originated two years before current fiscal year | $ 70,141 | $ 2,769
Average LTV, year three, originated two years before current fiscal year | 74.00% | 71.00%
Amortized cost, year four, originated three years before current fiscal year | $ 12,014 | $ 7,597
Average LTV, year four, originated three years before current fiscal year | 70.00% | 66.00%
Amortized cost, year five, originated four years before current fiscal year | $ 6,425 | $ 0
Average LTV, year five, originated four years before current fiscal year | 61.00% | 0.00%
Amortized cost, originated more than five years before current fiscal year | $ 51,806 | $ 32,327
Average LTV, originated more than five years before current fiscal year | 59.00% | 65.00%
Mortgage loans, amortized cost | $ 161,631 | $ 83,248
Total - Average LTV | 69.00% | 69.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Less Than 1.0 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
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 | $ 64,131
Average LTV, year two, originated in fiscal year before current fiscal year | 0.00% | 58.00%
Amortized cost, year three, originated two years before current fiscal year | $ 22,537 | $ 1,441
Average LTV, year three, originated two years before current fiscal year | 65.00% | 89.00%
Amortized cost, year four, originated three years before current fiscal year | $ 18,045 | $ 10,156
Average LTV, year four, originated three years before current fiscal year | 62.00% | 80.00%
Amortized cost, year five, originated four years before current fiscal year | $ 13,489 | $ 0
Average LTV, year five, originated four years before current fiscal year | 68.00% | 0.00%
Amortized cost, originated more than five years before current fiscal year | $ 21,775 | $ 21,031
Average LTV, originated more than five years before current fiscal year | 58.00% | 60.00%
Mortgage loans, amortized cost | $ 75,846 | $ 96,759
Total - Average LTV | 63.00% | 61.00%
Agricultural |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | $ 109,091 | $ 196,190
Average LTV, year one, originated in current fiscal year | 54.00% | 47.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 199,792 | $ 23,983
Average LTV, year two, originated in fiscal year before current fiscal year | 49.00% | 42.00%
Amortized cost, year three, originated two years before current fiscal year | $ 19,858 | $ 25,000
Average LTV, year three, originated two years before current fiscal year | 44.00% | 11.00%
Amortized cost, year four, originated three years before current fiscal year | $ 25,000 | $ 0
Average LTV, year four, originated three years before current fiscal year | 11.00% | 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 | $ 353,741 | $ 245,173
Total - Average LTV | 48.00% | 43.00%
Agricultural | Debt Service Coverage Ratio: Greater Than or Equal to 1.5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | $ 38,445 | $ 78,631
Average LTV, year one, originated in current fiscal year | 49.00% | 52.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 83,859 | $ 13,985
Average LTV, year two, originated in fiscal year before current fiscal year | 57.00% | 47.00%
Amortized cost, year three, originated two years before current fiscal year | $ 11,749 | $ 25,000
Average LTV, year three, originated two years before current fiscal year | 49.00% | 11.00%
Amortized cost, year four, originated three years before current fiscal year | $ 25,000 | $ 0
Average LTV, year four, originated three years before current fiscal year | 11.00% | 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 | $ 159,053 | $ 117,616
Total - Average LTV | 47.00% | 43.00%
Agricultural | Debt Service Coverage Ratio: Greater Than or Equal to 1.2 and Less Than 1.5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | $ 63,169 | $ 101,879
Average LTV, year one, originated in current fiscal year | 58.00% | 44.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 103,185 | $ 3,425
Average LTV, year two, originated in fiscal year before current fiscal year | 43.00% | 23.00%
Amortized cost, year three, originated two years before current fiscal year | $ 3,352 | $ 0
Average LTV, year three, originated two years before current fiscal year | 22.00% | 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 | $ 169,706 | $ 105,304
Total - Average LTV | 48.00% | 44.00%
Agricultural | Debt Service Coverage Ratio: Greater Than or Equal to 1.0 and Less Than 1.2 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | $ 7,477 | $ 4,213
Average LTV, year one, originated in current fiscal year | 44.00% | 37.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 4,125 | $ 6,573
Average LTV, year two, originated in fiscal year before current fiscal year | 36.00% | 43.00%
Amortized cost, year three, originated two years before current fiscal year | $ 4,757 | $ 0
Average LTV, year three, originated two years before current fiscal year | 50.00% | 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 | $ 16,359 | $ 10,786
Total - Average LTV | 44.00% | 41.00%
Agricultural | Debt Service Coverage Ratio: Less Than 1.0 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | $ 0 | $ 11,467
Average LTV, year one, originated in current fiscal year | 0.00% | 48.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 8,623 | $ 0
Average LTV, year two, originated in fiscal year before current fiscal year | 59.00% | 0.00%
Amortized cost, year three, originated two years before current fiscal year | $ 0 | $ 0
Average LTV, year three, originated two years before current fiscal year | 0.00% | 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 | $ 8,623 | $ 11,467
Total - Average LTV | 59.00% | 48.00%

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