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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details) $ in Thousands | Mar. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 61 | 107
Less than 12 months, Fair value | $ 61,159 | $ 82,130
Less than 12 months, Unrealized losses | $ (1,564) | $ (6,045)
12 months or longer, Number of issues | security | 440 | 401
12 months or longer, Fair value | $ 564,993 | $ 560,745
12 months or longer, Unrealized losses | $ (76,412) | $ (85,470)
Fixed Maturities | U.S. government obligations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 2 | 2
Less than 12 months, Fair value | $ 523 | $ 2,721
Less than 12 months, Unrealized losses | $ (1) | $ (110)
12 months or longer, Number of issues | security | 6 | 5
12 months or longer, Fair value | $ 11,816 | $ 8,943
12 months or longer, Unrealized losses | $ (762) | $ (828)
Fixed Maturities | Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 22 | 40
Less than 12 months, Fair value | $ 20,332 | $ 26,563
Less than 12 months, Unrealized losses | $ (421) | $ (2,910)
12 months or longer, Number of issues | security | 258 | 247
12 months or longer, Fair value | $ 319,002 | $ 325,992
12 months or longer, Unrealized losses | $ (39,830) | $ (46,451)
Fixed Maturities | Mortgage-backed and asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 36 | 64
Less than 12 months, Fair value | $ 39,815 | $ 52,751
Less than 12 months, Unrealized losses | $ (1,073) | $ (2,974)
12 months or longer, Number of issues | security | 172 | 146
12 months or longer, Fair value | $ 227,174 | $ 219,189
12 months or longer, Unrealized losses | $ (34,596) | $ (36,733)
Fixed Maturities | Municipal bonds |  |
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 | 3 | 3
12 months or longer, Fair value | $ 6,900 | $ 6,621
12 months or longer, Unrealized losses | $ (1,179) | $ (1,458)
Fixed Maturities | Redeemable preferred stock |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 1 | 1
Less than 12 months, Fair value | $ 489 | $ 95
Less than 12 months, Unrealized losses | $ (69) | $ (51)
12 months or longer, Number of issues | security | 1 | 0
12 months or longer, Fair value | $ 101 | $ 0
12 months or longer, Unrealized losses | $ (45) | $ 0

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