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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, 2021 | Dec. 31, 2020
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Commercial Mortgage Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost, originated in current fiscal year | $ 54,134 | $ 543,991
Average LTV, originated in current fiscal year | 67.00% | 65.00%
Amortized cost, originated in fiscal year before latest fiscal year | $ 541,611 | $ 755,584
Average LTV, originated in fiscal year before latest fiscal year | 64.00% | 67.00%
Amortized cost, originated two years before latest fiscal year | $ 754,416 | $ 527,670
Average LTV, originated two years before latest fiscal year | 66.00% | 64.00%
Amortized cost, originated three years before latest fiscal year | $ 511,189 | $ 459,055
Average LTV, originated three years before latest fiscal year | 65.00% | 60.00%
Amortized cost, originated four years before latest fiscal year | $ 455,370 | $ 411,834
Average LTV, originated four years before latest fiscal year | 60.00% | 55.00%
Amortized cost, originated five or more years before latest fiscal year | $ 1,229,207 | $ 880,754
Average LTV, originated five or more years before latest fiscal year | 50.00% | 49.00%
Amortized cost | $ 3,545,927 | $ 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, originated in current fiscal year | $ 40,908 | $ 364,574
Average LTV, originated in current fiscal year | 66.00% | 63.00%
Amortized cost, originated in fiscal year before latest fiscal year | $ 393,845 | $ 442,370
Average LTV, originated in fiscal year before latest fiscal year | 63.00% | 66.00%
Amortized cost, originated two years before latest fiscal year | $ 496,170 | $ 399,193
Average LTV, originated two years before latest fiscal year | 65.00% | 62.00%
Amortized cost, originated three years before latest fiscal year | $ 412,055 | $ 316,738
Average LTV, originated three years before latest fiscal year | 64.00% | 57.00%
Amortized cost, originated four years before latest fiscal year | $ 314,347 | $ 359,321
Average LTV, originated four years before latest fiscal year | 57.00% | 54.00%
Amortized cost, originated five or more years before latest fiscal year | $ 1,017,700 | $ 715,706
Average LTV, originated five or more years before latest fiscal year | 48.00% | 47.00%
Amortized cost | $ 2,675,025 | $ 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, originated in current fiscal year | $ 13,226 | $ 161,779
Average LTV, originated in current fiscal year | 69.00% | 66.00%
Amortized cost, originated in fiscal year before latest fiscal year | $ 130,276 | $ 226,166
Average LTV, originated in fiscal year before latest fiscal year | 67.00% | 70.00%
Amortized cost, originated two years before latest fiscal year | $ 212,153 | $ 124,267
Average LTV, originated two years before latest fiscal year | 70.00% | 72.00%
Amortized cost, originated three years before latest fiscal year | $ 94,962 | $ 124,564
Average LTV, originated three years before latest fiscal year | 73.00% | 67.00%
Amortized cost, originated four years before latest fiscal year | $ 123,465 | $ 52,513
Average LTV, originated four years before latest fiscal year | 67.00% | 62.00%
Amortized cost, originated five or more years before latest fiscal year | $ 162,707 | $ 111,690
Average LTV, originated five or more years before latest fiscal year | 57.00% | 55.00%
Amortized cost | $ 736,789 | $ 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, originated in current fiscal year | $ 0 | $ 17,638
Average LTV, originated in current fiscal year | 0.00% | 82.00%
Amortized cost, originated in fiscal year before latest fiscal year | $ 17,490 | $ 22,917
Average LTV, originated in fiscal year before latest fiscal year | 81.00% | 67.00%
Amortized cost, originated two years before latest fiscal year | $ 8,958 | $ 2,769
Average LTV, originated two years before latest fiscal year | 68.00% | 71.00%
Amortized cost, originated three years before latest fiscal year | $ 2,744 | $ 7,597
Average LTV, originated three years before latest fiscal year | 70.00% | 66.00%
Amortized cost, originated four years before latest fiscal year | $ 7,495 | $ 0
Average LTV, originated four years before latest fiscal year | 65.00% | 0.00%
Amortized cost, originated five or more years before latest fiscal year | $ 28,608 | $ 32,327
Average LTV, originated five or more years before latest fiscal year | 63.00% | 65.00%
Amortized cost | $ 65,295 | $ 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, originated in current fiscal year | $ 0 | $ 0
Average LTV, originated in current fiscal year | 0.00% | 0.00%
Amortized cost, originated in fiscal year before latest fiscal year | $ 0 | $ 64,131
Average LTV, originated in fiscal year before latest fiscal year | 0.00% | 58.00%
Amortized cost, originated two years before latest fiscal year | $ 37,135 | $ 1,441
Average LTV, originated two years before latest fiscal year | 65.00% | 89.00%
Amortized cost, originated three years before latest fiscal year | $ 1,428 | $ 10,156
Average LTV, originated three years before latest fiscal year | 88.00% | 80.00%
Amortized cost, originated four years before latest fiscal year | $ 10,063 | $ 0
Average LTV, originated four years before latest fiscal year | 80.00% | 0.00%
Amortized cost, originated five or more years before latest fiscal year | $ 20,192 | $ 21,031
Average LTV, originated five or more years before latest fiscal year | 61.00% | 60.00%
Amortized cost | $ 68,818 | $ 96,759
Total - Average LTV | 66.00% | 61.00%
Agricultural |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost, originated in current fiscal year | $ 23,355 | $ 196,190
Average LTV, originated in current fiscal year | 43.00% | 47.00%
Amortized cost, originated in fiscal year before latest fiscal year | $ 197,147 | $ 23,983
Average LTV, originated in fiscal year before latest fiscal year | 48.00% | 42.00%
Amortized cost, originated two years before latest fiscal year | $ 20,083 | $ 25,000
Average LTV, originated two years before latest fiscal year | 45.00% | 11.00%
Amortized cost, originated three years before latest fiscal year | $ 25,000 | $ 0
Average LTV, originated three years before latest fiscal year | 11.00% | 0.00%
Amortized cost, originated four years before latest fiscal year | $ 0 | $ 0
Average LTV, originated four years before latest fiscal year | 0.00% | 0.00%
Amortized cost, originated five or more years before latest fiscal year | $ 0 | $ 0
Average LTV, originated five or more years before latest fiscal year | 0.00% | 0.00%
Amortized cost | $ 265,585 | $ 245,173
Total - Average LTV | 44.00% | 43.00%
Agricultural | Debt Service Coverage Ratio: Greater Than or Equal to 1.5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized cost, originated in current fiscal year | $ 12,128 | $ 78,631
Average LTV, originated in current fiscal year | 39.00% | 52.00%
Amortized cost, originated in fiscal year before latest fiscal year | $ 80,175 | $ 13,985
Average LTV, originated in fiscal year before latest fiscal year | 53.00% | 47.00%
Amortized cost, originated two years before latest fiscal year | $ 11,901 | $ 25,000
Average LTV, originated two years before latest fiscal year | 49.00% | 11.00%
Amortized cost, originated three years before latest fiscal year | $ 25,000 | $ 0
Average LTV, originated three years before latest fiscal year | 11.00% | 0.00%
Amortized cost, originated four years before latest fiscal year | $ 0 | $ 0
Average LTV, originated four years before latest fiscal year | 0.00% | 0.00%
Amortized cost, originated five or more years before latest fiscal year | $ 0 | $ 0
Average LTV, originated five or more years before latest fiscal year | 0.00% | 0.00%
Amortized cost | $ 129,204 | $ 117,616
Total - Average LTV | 43.00% | 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, originated in current fiscal year | $ 3,748 | $ 101,879
Average LTV, originated in current fiscal year | 57.00% | 44.00%
Amortized cost, originated in fiscal year before latest fiscal year | $ 104,090 | $ 3,425
Average LTV, originated in fiscal year before latest fiscal year | 43.00% | 23.00%
Amortized cost, originated two years before latest fiscal year | $ 3,401 | $ 0
Average LTV, originated two years before latest fiscal year | 23.00% | 0.00%
Amortized cost, originated three years before latest fiscal year | $ 0 | $ 0
Average LTV, originated three years before latest fiscal year | 0.00% | 0.00%
Amortized cost, originated four years before latest fiscal year | $ 0 | $ 0
Average LTV, originated four years before latest fiscal year | 0.00% | 0.00%
Amortized cost, originated five or more years before latest fiscal year | $ 0 | $ 0
Average LTV, originated five or more years before latest fiscal year | 0.00% | 0.00%
Amortized cost | $ 111,239 | $ 105,304
Total - Average LTV | 43.00% | 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, originated in current fiscal year | $ 7,479 | $ 4,213
Average LTV, originated in current fiscal year | 44.00% | 37.00%
Amortized cost, originated in fiscal year before latest fiscal year | $ 4,186 | $ 6,573
Average LTV, originated in fiscal year before latest fiscal year | 37.00% | 43.00%
Amortized cost, originated two years before latest fiscal year | $ 4,781 | $ 0
Average LTV, originated two years before latest fiscal year | 50.00% | 0.00%
Amortized cost, originated three years before latest fiscal year | $ 0 | $ 0
Average LTV, originated three years before latest fiscal year | 0.00% | 0.00%
Amortized cost, originated four years before latest fiscal year | $ 0 | $ 0
Average LTV, originated four years before latest fiscal year | 0.00% | 0.00%
Amortized cost, originated five or more years before latest fiscal year | $ 0 | $ 0
Average LTV, originated five or more years before latest fiscal year | 0.00% | 0.00%
Amortized cost | $ 16,446 | $ 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, originated in current fiscal year | $ 0 | $ 11,467
Average LTV, originated in current fiscal year | 0.00% | 48.00%
Amortized cost, originated in fiscal year before latest fiscal year | $ 8,696 | $ 0
Average LTV, originated in fiscal year before latest fiscal year | 60.00% | 0.00%
Amortized cost, originated two years before latest fiscal year | $ 0 | $ 0
Average LTV, originated two years before latest fiscal year | 0.00% | 0.00%
Amortized cost, originated three years before latest fiscal year | $ 0 | $ 0
Average LTV, originated three years before latest fiscal year | 0.00% | 0.00%
Amortized cost, originated four years before latest fiscal year | $ 0 | $ 0
Average LTV, originated four years before latest fiscal year | 0.00% | 0.00%
Amortized cost, originated five or more years before latest fiscal year | $ 0 | $ 0
Average LTV, originated five or more years before latest fiscal year | 0.00% | 0.00%
Amortized cost | $ 8,696 | $ 11,467
Total - Average LTV | 60.00% | 48.00%

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