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Mortgage Loans on Real Estate (Summary By Debt Service Coverage and Loan to Value Ratios) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Commercial Mortgage Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 - Amortized cost | $ 543,991 |
2020 - Average LTV | 65.00% |
2019 - Amortized cost | $ 755,584 |
2019 - Average LTV | 67.00% |
2018 - Amortized cost | $ 527,670 |
2018 - Average LTV | 64.00% |
2017 - Amortized cost | $ 459,055 |
2017 - Average LTV | 60.00% |
2016 - Amortized cost | $ 411,834 |
2016 - Average LTV | 55.00% |
Prior - Amortized cost | $ 880,754 |
Prior - Average LTV | 49.00% |
Amortized cost | $ 3,578,888 | $ 3,406,712
Total - Average LTV | 59.00% |
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 - Amortized cost | $ 364,574 |
2020 - Average LTV | 63.00% |
2019 - Amortized cost | $ 442,370 |
2019 - Average LTV | 66.00% |
2018 - Amortized cost | $ 399,193 |
2018 - Average LTV | 62.00% |
2017 - Amortized cost | $ 316,738 |
2017 - Average LTV | 57.00% |
2016 - Amortized cost | $ 359,321 |
2016 - Average LTV | 54.00% |
Prior - Amortized cost | $ 715,706 |
Prior - Average LTV | 47.00% |
Amortized cost | $ 2,597,902 |
Total - Average LTV | 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] |  |
2020 - Amortized cost | $ 161,779 |
2020 - Average LTV | 66.00% |
2019 - Amortized cost | $ 226,166 |
2019 - Average LTV | 70.00% |
2018 - Amortized cost | $ 124,267 |
2018 - Average LTV | 72.00% |
2017 - Amortized cost | $ 124,564 |
2017 - Average LTV | 67.00% |
2016 - Amortized cost | $ 52,513 |
2016 - Average LTV | 62.00% |
Prior - Amortized cost | $ 111,690 |
Prior - Average LTV | 55.00% |
Amortized cost | $ 800,979 |
Total - Average LTV | 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] |  |
2020 - Amortized cost | $ 17,638 |
2020 - Average LTV | 82.00% |
2019 - Amortized cost | $ 22,917 |
2019 - Average LTV | 67.00% |
2018 - Amortized cost | $ 2,769 |
2018 - Average LTV | 71.00% |
2017 - Amortized cost | $ 7,597 |
2017 - Average LTV | 66.00% |
2016 - Amortized cost | $ 0 |
2016 - Average LTV | 0.00% |
Prior - Amortized cost | $ 32,327 |
Prior - Average LTV | 65.00% |
Amortized cost | $ 83,248 |
Total - Average LTV | 69.00% |
Commercial Mortgage Loans | Debt Service Coverage Ratio: Less Than 1.0 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 - Amortized cost | $ 0 |
2020 - Average LTV | 0.00% |
2019 - Amortized cost | $ 64,131 |
2019 - Average LTV | 58.00% |
2018 - Amortized cost | $ 1,441 |
2018 - Average LTV | 89.00% |
2017 - Amortized cost | $ 10,156 |
2017 - Average LTV | 80.00% |
2016 - Amortized cost | $ 0 |
2016 - Average LTV | 0.00% |
Prior - Amortized cost | $ 21,031 |
Prior - Average LTV | 60.00% |
Amortized cost | $ 96,759 |
Total - Average LTV | 61.00% |
Agricultural Mortgage Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 - Amortized cost | $ 196,190 |
2020 - Average LTV | 47.00% |
2019 - Amortized cost | $ 23,983 |
2019 - Average LTV | 42.00% |
2018 - Amortized cost | $ 25,000 |
2018 - Average LTV | 11.00% |
2017 - Amortized cost | $ 0 |
2017 - Average LTV | 0.00% |
2016 - Amortized cost | $ 0 |
2016 - Average LTV | 0.00% |
Prior - Amortized cost | $ 0 |
Prior - Average LTV | 0.00% |
Amortized cost | $ 245,173 | $ 51,260
Total - Average LTV | 43.00% |
Agricultural Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 - Amortized cost | $ 78,631 |
2020 - Average LTV | 52.00% |
2019 - Amortized cost | $ 13,985 |
2019 - Average LTV | 47.00% |
2018 - Amortized cost | $ 25,000 |
2018 - Average LTV | 11.00% |
2017 - Amortized cost | $ 0 |
2017 - Average LTV | 0.00% |
2016 - Amortized cost | $ 0 |
2016 - Average LTV | 0.00% |
Prior - Amortized cost | $ 0 |
Prior - Average LTV | 0.00% |
Amortized cost | $ 117,616 |
Total - Average LTV | 43.00% |
Agricultural 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] |  |
2020 - Amortized cost | $ 101,879 |
2020 - Average LTV | 44.00% |
2019 - Amortized cost | $ 3,425 |
2019 - Average LTV | 23.00% |
2018 - Amortized cost | $ 0 |
2018 - Average LTV | 0.00% |
2017 - Amortized cost | $ 0 |
2017 - Average LTV | 0.00% |
2016 - Amortized cost | $ 0 |
2016 - Average LTV | 0.00% |
Prior - Amortized cost | $ 0 |
Prior - Average LTV | 0.00% |
Amortized cost | $ 105,304 |
Total - Average LTV | 44.00% |
Agricultural 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] |  |
2020 - Amortized cost | $ 4,213 |
2020 - Average LTV | 37.00% |
2019 - Amortized cost | $ 6,573 |
2019 - Average LTV | 43.00% |
2018 - Amortized cost | $ 0 |
2018 - Average LTV | 0.00% |
2017 - Amortized cost | $ 0 |
2017 - Average LTV | 0.00% |
2016 - Amortized cost | $ 0 |
2016 - Average LTV | 0.00% |
Prior - Amortized cost | $ 0 |
Prior - Average LTV | 0.00% |
Amortized cost | $ 10,786 |
Total - Average LTV | 41.00% |
Agricultural Mortgage Loans | Debt Service Coverage Ratio: Less Than 1.0 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 - Amortized cost | $ 11,467 |
2020 - Average LTV | 48.00% |
2019 - Amortized cost | $ 0 |
2019 - Average LTV | 0.00% |
2018 - Amortized cost | $ 0 |
2018 - Average LTV | 0.00% |
2017 - Amortized cost | $ 0 |
2017 - Average LTV | 0.00% |
2016 - Amortized cost | $ 0 |
2016 - Average LTV | 0.00% |
Prior - Amortized cost | $ 0 |
Prior - Average LTV | 0.00% |
Amortized cost | $ 11,467 |
Total - Average LTV | 48.00% |

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