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Investments, Summary of Realized Investment Gains (Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Summary of realized investment gains (losses) [Abstract] |  |
Gains | $ 7,871 | $ 3,224
Losses | (451) | (1,650)
Realized investment gains, net | 7,420 | 1,574
Fixed Maturities [Member] |  |
Summary of realized investment gains (losses) [Abstract] |  |
Gains | 835 | 2,003
Losses | (450) | (1,650)
Realized investment gains, net | 385 | 353
Proceeds from sales of available-for-sale fixed maturities [Abstract] |  |
Sales proceeds | 18,504 | 117,530
Gross gains | 835 | 2,003
Gross losses | (450) | (1,650)
Equity Securities [Member] |  |
Summary of realized investment gains (losses) [Abstract] |  |
Gains | 88 | 1,221
Losses | (1) | 0
Realized investment gains, net | 87 | 1,221
Proceeds from sales of available-for-sale equity securities [Abstract] |  |
Sales proceeds | 5 | 2,568
Gross gains | 0 | 1,113
Gross losses | (1) | 0
Other Invested Assets [Member] |  |
Summary of realized investment gains (losses) [Abstract] |  |
Gains | 6,948 | 0
Losses | 0 | 0
Realized investment gains, net | 6,948 | $ 0
Proceeds from Sales of other invested assets [Abstract] |  |
Sales proceeds | 12,700 |
Gross gains | $ 6,900 |

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