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Fixed-Maturity Securities Available-For-Sale - Schedule of Company's Investments Estimated Fair Value and Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value Less than 12 months | $ 28,395 | $ 222,037
Unrealized Losses Less than 12 months | (121) | (2,067)
Estimated Fair Value More than 12 months | 6,144 | 10,090
Unrealized Losses More than 12 months | (62) | (105)
Total Estimated Fair Value | 34,539 | 232,127
Total Unrealized Losses | (183) | (2,172)
U.S. government and agencies |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value Less than 12 months | 2,030 | 93,063
Unrealized Losses Less than 12 months | 0 | (729)
Estimated Fair Value More than 12 months | 1,724 | 2,975
Unrealized Losses More than 12 months | (14) | (47)
Total Estimated Fair Value | 3,754 | 96,038
Total Unrealized Losses | (14) | (776)
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value Less than 12 months | 10,011 |
Unrealized Losses Less than 12 months | (102) |
Estimated Fair Value More than 12 months | 2,436 |
Unrealized Losses More than 12 months | (42) |
Total Estimated Fair Value | 12,447 |
Total Unrealized Losses | (144) |
Corporate Bonds |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value Less than 12 months | 445 |
Unrealized Losses Less than 12 months | (1) |
Estimated Fair Value More than 12 months | 1,984 |
Unrealized Losses More than 12 months | (6) |
Total Estimated Fair Value | 2,429 |
Total Unrealized Losses | (7) |
Asset-Backed Securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value Less than 12 months | 15,909 |
Unrealized Losses Less than 12 months | (18) |
Estimated Fair Value More than 12 months | 0 |
Unrealized Losses More than 12 months | 0 |
Total Estimated Fair Value | 15,909 |
Total Unrealized Losses | $ (18) |
U.S. states, territories and possessions |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value Less than 12 months |  | 9,169
Unrealized Losses Less than 12 months |  | (193)
Estimated Fair Value More than 12 months |  | 502
Unrealized Losses More than 12 months |  | 0
Total Estimated Fair Value |  | 9,671
Total Unrealized Losses |  | (193)
Industrial and miscellaneous |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value Less than 12 months |  | 69,745
Unrealized Losses Less than 12 months |  | (389)
Estimated Fair Value More than 12 months |  | 3,417
Unrealized Losses More than 12 months |  | (40)
Total Estimated Fair Value |  | 73,162
Total Unrealized Losses |  | (429)
Special Revenue |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value Less than 12 months |  | 43,829
Unrealized Losses Less than 12 months |  | (604)
Estimated Fair Value More than 12 months |  | 2,693
Unrealized Losses More than 12 months |  | (17)
Total Estimated Fair Value |  | 46,522
Total Unrealized Losses |  | (621)
Political subdivisions |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value Less than 12 months |  | 4,477
Unrealized Losses Less than 12 months |  | (151)
Estimated Fair Value More than 12 months |  | 503
Unrealized Losses More than 12 months |  | (1)
Total Estimated Fair Value |  | 4,980
Total Unrealized Losses |  | (152)
Hybrid securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Estimated Fair Value Less than 12 months |  | 1,754
Unrealized Losses Less than 12 months |  | (1)
Estimated Fair Value More than 12 months |  | 0
Unrealized Losses More than 12 months |  | 0
Total Estimated Fair Value |  | 1,754
Total Unrealized Losses |  | $ (1)

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