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Mortgage Loans on Real Estate (Summary By Debt Service Coverage and Loan to Value Ratios) (Details) - USD ($) $ in Thousands | Jun. 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 | $ 94,924 | $ 543,991
Average LTV, year one, originated in current fiscal year | 68.00% | 65.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 539,326 | $ 755,584
Average LTV, year two, originated in fiscal year before current fiscal year | 64.00% | 67.00%
Amortized cost, year three, originated two years before current fiscal year | $ 753,362 | $ 527,670
Average LTV, year three, originated two years before current fiscal year | 66.00% | 64.00%
Amortized cost, year four, originated three years before current fiscal year | $ 506,817 | $ 459,055
Average LTV, year four, originated three years before current fiscal year | 65.00% | 60.00%
Amortized cost, year five, originated four years before current fiscal year | $ 448,100 | $ 411,834
Average LTV, year five, originated four years before current fiscal year | 60.00% | 55.00%
Amortized cost, originated more than five years before current fiscal year | $ 1,115,941 | $ 880,754
Average LTV, originated more than five years before current fiscal year | 49.00% | 49.00%
Mortgage loans, amortized cost | $ 3,458,470 | $ 3,578,888
Total - Average LTV | 59.00% | 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 | $ 81,799 | $ 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 | $ 429,215 | $ 442,370
Average LTV, year two, originated in fiscal year before current fiscal year | 63.00% | 66.00%
Amortized cost, year three, originated two years before current fiscal year | $ 491,471 | $ 399,193
Average LTV, year three, originated two years before current fiscal year | 64.00% | 62.00%
Amortized cost, year four, originated three years before current fiscal year | $ 420,279 | $ 316,738
Average LTV, year four, originated three years before current fiscal year | 63.00% | 57.00%
Amortized cost, year five, originated four years before current fiscal year | $ 312,331 | $ 359,321
Average LTV, year five, originated four years before current fiscal year | 56.00% | 54.00%
Amortized cost, originated more than five years before current fiscal year | $ 913,649 | $ 715,706
Average LTV, originated more than five years before current fiscal year | 48.00% | 47.00%
Mortgage loans, amortized cost | $ 2,648,744 | $ 2,597,902
Total - Average LTV | 57.00% | 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 | $ 13,125 | $ 161,779
Average LTV, year one, originated in current fiscal year | 69.00% | 66.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 86,440 | $ 226,166
Average LTV, year two, originated in fiscal year before current fiscal year | 64.00% | 70.00%
Amortized cost, year three, originated two years before current fiscal year | $ 204,354 | $ 124,267
Average LTV, year three, originated two years before current fiscal year | 69.00% | 72.00%
Amortized cost, year four, originated three years before current fiscal year | $ 85,124 | $ 124,564
Average LTV, year four, originated three years before current fiscal year | 73.00% | 67.00%
Amortized cost, year five, originated four years before current fiscal year | $ 122,666 | $ 52,513
Average LTV, year five, originated four years before current fiscal year | 67.00% | 62.00%
Amortized cost, originated more than five years before current fiscal year | $ 145,080 | $ 111,690
Average LTV, originated more than five years before current fiscal year | 59.00% | 55.00%
Mortgage loans, amortized cost | $ 656,789 | $ 800,979
Total - Average LTV | 66.00% | 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 | $ 23,671 | $ 22,917
Average LTV, year two, originated in fiscal year before current fiscal year | 78.00% | 67.00%
Amortized cost, year three, originated two years before current fiscal year | $ 19,409 | $ 2,769
Average LTV, year three, originated two years before current fiscal year | 80.00% | 71.00%
Amortized cost, year four, originated three years before current fiscal year | $ 0 | $ 7,597
Average LTV, year four, originated three years before current fiscal year | 0.00% | 66.00%
Amortized cost, year five, originated four years before current fiscal year | $ 2,250 | $ 0
Average LTV, year five, originated four years before current fiscal year | 72.00% | 0.00%
Amortized cost, originated more than five years before current fiscal year | $ 44,910 | $ 32,327
Average LTV, originated more than five years before current fiscal year | 58.00% | 65.00%
Mortgage loans, amortized cost | $ 90,240 | $ 83,248
Total - Average LTV | 68.00% | 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 | $ 38,128 | $ 1,441
Average LTV, year three, originated two years before current fiscal year | 66.00% | 89.00%
Amortized cost, year four, originated three years before current fiscal year | $ 1,414 | $ 10,156
Average LTV, year four, originated three years before current fiscal year | 87.00% | 80.00%
Amortized cost, year five, originated four years before current fiscal year | $ 10,853 | $ 0
Average LTV, year five, originated four years before current fiscal year | 78.00% | 0.00%
Amortized cost, originated more than five years before current fiscal year | $ 12,302 | $ 21,031
Average LTV, originated more than five years before current fiscal year | 49.00% | 60.00%
Mortgage loans, amortized cost | $ 62,697 | $ 96,759
Total - Average LTV | 66.00% | 61.00%
Agricultural |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | $ 30,416 | $ 196,190
Average LTV, year one, originated in current fiscal year | 45.00% | 47.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 201,319 | $ 23,983
Average LTV, year two, originated in fiscal year before current fiscal year | 50.00% | 42.00%
Amortized cost, year three, originated two years before current fiscal year | $ 19,984 | $ 25,000
Average LTV, year three, originated two years before current fiscal year | 45.00% | 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 | $ 276,719 | $ 245,173
Total - Average LTV | 45.00% | 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 | $ 12,108 | $ 78,631
Average LTV, year one, originated in current fiscal year | 39.00% | 52.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 84,764 | $ 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 | $ 11,841 | $ 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 | $ 133,713 | $ 117,616
Total - Average LTV | 46.00% | 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 | $ 10,829 | $ 101,879
Average LTV, year one, originated in current fiscal year | 54.00% | 44.00%
Amortized cost, year two, originated in fiscal year before current fiscal year | $ 103,764 | $ 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 | $ 3,385 | $ 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 | $ 117,978 | $ 105,304
Total - Average LTV | 44.00% | 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 | $ 7,479 | $ 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 | $ 4,166 | $ 6,573
Average LTV, year two, originated in fiscal year before current fiscal year | 29.00% | 43.00%
Amortized cost, year three, originated two years before current fiscal year | $ 4,758 | $ 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 | $ 16,403 | $ 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 | $ 8,625 | $ 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 | $ 8,625 | $ 11,467
Total - Average LTV | 59.00% | 48.00%

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