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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details) $ in Thousands | Dec. 31, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 79 | 68
Less than 12 months, Fair value | $ 173,670 | $ 79,297
Less than 12 months, Unrealized losses | $ (844) | $ (468)
12 months or longer, Number of issues | security | 0 | 42
12 months or longer, Fair value | $ 0 | $ 65,802
12 months or longer, Unrealized losses | $ 0 | $ (557)
U.S. government obligations and agencies [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 8 | 2
Less than 12 months, Fair value | $ 31,729 | $ 3,836
Less than 12 months, Unrealized losses | $ (55) | $ (108)
12 months or longer, Number of issues | security | 0 | 4
12 months or longer, Fair value | $ 0 | $ 23,186
12 months or longer, Unrealized losses | $ 0 | $ (80)
Corporate bonds [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 27 | 18
Less than 12 months, Fair value | $ 28,791 | $ 16,808
Less than 12 months, Unrealized losses | $ (162) | $ (107)
12 months or longer, Number of issues | security | 0 | 7
12 months or longer, Fair value | $ 0 | $ 5,866
12 months or longer, Unrealized losses | $ 0 | $ (34)
Mortgage-backed and asset-backed securities [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 42 | 42
Less than 12 months, Fair value | $ 112,462 | $ 58,023
Less than 12 months, Unrealized losses | $ (615) | $ (245)
12 months or longer, Number of issues | security | 0 | 26
12 months or longer, Fair value | $ 0 | $ 34,985
12 months or longer, Unrealized losses | $ 0 | $ (361)
Municipal bonds [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 0 | 0
Less than 12 months, Fair value | $ 0 | $ 0
Less than 12 months, Unrealized losses | $ 0 | $ 0
12 months or longer, Number of issues | security | 0 | 1
12 months or longer, Fair value | $ 0 | $ 276
12 months or longer, Unrealized losses | $ 0 | $ (4)
Redeemable preferred stock [Member] | Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 2 | 6
Less than 12 months, Fair value | $ 688 | $ 630
Less than 12 months, Unrealized losses | $ (12) | $ (8)
12 months or longer, Number of issues | security | 0 | 4
12 months or longer, Fair value | $ 0 | $ 1,489
12 months or longer, Unrealized losses | $ 0 | $ (78)

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