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Mortgage Loans on Real Estate (Summary By Debt Service Coverage and Loan to Value Ratios) (Details) - Commercial Real Estate Portfolio Segment - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 - Amortized cost | $ 321,403 |
2020 - Average LTV | 65.00% |
2019 - Amortized cost | $ 800,009 |
2019 - Average LTV | 68.00% |
2018 - Amortized cost | $ 576,980 |
2018 - Average LTV | 64.00% |
2017 - Amortized cost | $ 483,594 |
2017 - Average LTV | 61.00% |
2016 - Amortized cost | $ 436,381 |
2016 - Average LTV | 56.00% |
Prior - Amortized cost | $ 1,070,034 |
Prior - Average LTV | 48.00% |
Amortized cost | $ 3,688,401 | $ 3,457,972
Total - Average LTV | 59.00% |
Debt Service Coverage Ratio, Greater Than or Equal to 1.5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
2020 - Amortized cost | $ 209,636 |
2020 - Average LTV | 63.00% |
2019 - Amortized cost | $ 463,287 |
2019 - Average LTV | 67.00% |
2018 - Amortized cost | $ 411,362 |
2018 - Average LTV | 61.00% |
2017 - Amortized cost | $ 308,703 |
2017 - Average LTV | 58.00% |
2016 - Amortized cost | $ 394,953 |
2016 - Average LTV | 56.00% |
Prior - Amortized cost | $ 863,496 |
Prior - Average LTV | 47.00% |
Amortized cost | $ 2,651,437 |
Total - Average LTV | 56.00% |
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 | $ 108,167 |
2020 - Average LTV | 68.00% |
2019 - Amortized cost | $ 299,053 |
2019 - Average LTV | 69.00% |
2018 - Amortized cost | $ 145,090 |
2018 - Average LTV | 71.00% |
2017 - Amortized cost | $ 159,166 |
2017 - Average LTV | 66.00% |
2016 - Amortized cost | $ 37,411 |
2016 - Average LTV | 60.00% |
Prior - Amortized cost | $ 138,857 |
Prior - Average LTV | 54.00% |
Amortized cost | $ 887,744 |
Total - Average LTV | 66.00% |
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 | $ 3,600 |
2020 - Average LTV | 68.00% |
2019 - Amortized cost | $ 36,219 |
2019 - Average LTV | 61.00% |
2018 - Amortized cost | $ 11,056 |
2018 - Average LTV | 73.00% |
2017 - Amortized cost | $ 15,725 |
2017 - Average LTV | 65.00% |
2016 - Amortized cost | $ 4,017 |
2016 - Average LTV | 47.00% |
Prior - Amortized cost | $ 45,125 |
Prior - Average LTV | 60.00% |
Amortized cost | $ 115,742 |
Total - Average LTV | 62.00% |
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 | $ 1,450 |
2019 - Average LTV | 43.00% |
2018 - Amortized cost | $ 9,472 |
2018 - Average LTV | 70.00% |
2017 - Amortized cost | $ 0 |
2017 - Average LTV | 0.00% |
2016 - Amortized cost | $ 0 |
2016 - Average LTV | 0.00% |
Prior - Amortized cost | $ 22,556 |
Prior - Average LTV | 52.00% |
Amortized cost | $ 33,478 |
Total - Average LTV | 57.00% |

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