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Investments - Gross Unrealized Losses of Fixed Maturities and Equity Securities in Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
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Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 562,450 | $ 478,866
Fixed maturity securities, Fair Value, More than 12 Months | 422,797 | 472,720
Fixed maturity securities, Fair Value, Total | 985,247 | 951,586
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 22,533 | 5,734
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 5,849 | 7,880
Fixed maturity securities, Gross Unrealized Losses, Total | $ 28,382 | $ 13,614
Number of positions with a gross unrealized loss, 12 Months or Less | security | 308 | 330
Number of position with a gross unrealized loss, more than 12 months | security | 123 | 137
Number of position with a gross unrealized loss, Total | security | 431 | 467
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less | 8.90% | 8.30%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months | 6.70% | 8.20%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total | 15.60% | 16.50%
Mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 4,842 | $ 72,422
Fixed maturity securities, Fair Value, More than 12 Months | 2,644 | 2,620
Fixed maturity securities, Fair Value, Total | 7,486 | 75,042
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 75 | 1,282
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 156 | 205
Fixed maturity securities, Gross Unrealized Losses, Total | 231 | 1,487
Other |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 95,919 | 38,341
Fixed maturity securities, Fair Value, More than 12 Months | 0 | 1,527
Fixed maturity securities, Fair Value, Total | 95,919 | 39,868
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 1,033 | 619
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0 | 2
Fixed maturity securities, Gross Unrealized Losses, Total | 1,033 | 621
Municipal bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 18,097 | 91,195
Fixed maturity securities, Fair Value, More than 12 Months | 0 | 9,160
Fixed maturity securities, Fair Value, Total | 18,097 | 100,355
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 504 | 977
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0 | 603
Fixed maturity securities, Gross Unrealized Losses, Total | 504 | 1,580
Foreign government bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 0 | 0
Fixed maturity securities, Fair Value, More than 12 Months | 0 | 0
Fixed maturity securities, Fair Value, Total | 0 | 0
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 0 | 0
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0 | 0
Fixed maturity securities, Gross Unrealized Losses, Total | 0 | 0
Corporate bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 126,619 | 58,198
Fixed maturity securities, Fair Value, More than 12 Months | 10,879 | 16,622
Fixed maturity securities, Fair Value, Total | 137,498 | 74,820
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 3,768 | 886
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 174 | 909
Fixed maturity securities, Gross Unrealized Losses, Total | 3,942 | 1,795
Other asset-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 316,973 | 218,710
Fixed maturity securities, Fair Value, More than 12 Months | 409,274 | 442,791
Fixed maturity securities, Fair Value, Total | 726,247 | 661,501
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 17,153 | 1,970
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 5,519 | 6,161
Fixed maturity securities, Gross Unrealized Losses, Total | $ 22,672 | $ 8,131

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