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Fixed-Maturity Securities Available-For-Sale - Schedule of Estimated Fair Value of Investments in Fixed-Maturity Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | $ 465,454 | $ 464,585
Gross Unrealized Gains | 9,332 | 2,553
Gross Unrealized Losses | (183) | (2,172)
Estimated Fair Value | 474,603 | 464,966
U.S. government and agencies |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 145,066 | 166,641
Gross Unrealized Gains | 1,941 | 418
Gross Unrealized Losses | (14) | (776)
Estimated Fair Value | 146,993 | 166,283
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 166,703 |
Gross Unrealized Gains | 3,423 |
Gross Unrealized Losses | (144) |
Estimated Fair Value | 169,982 |
Corporate Bonds |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 129,982 |
Gross Unrealized Gains | 3,823 |
Gross Unrealized Losses | (7) |
Estimated Fair Value | 133,798 |
Asset-Backed Securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost | 23,703 |
Gross Unrealized Gains | 145 |
Gross Unrealized Losses | (18) |
Estimated Fair Value | $ 23,830 |
U.S. states, territories and possessions |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost |  | 17,344
Gross Unrealized Gains |  | 71
Gross Unrealized Losses |  | (193)
Estimated Fair Value |  | 17,222
Industrial and miscellaneous |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost |  | 149,104
Gross Unrealized Gains |  | 1,350
Gross Unrealized Losses |  | (429)
Estimated Fair Value |  | 150,025
Special Revenue |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost |  | 106,681
Gross Unrealized Gains |  | 527
Gross Unrealized Losses |  | (622)
Estimated Fair Value |  | 106,586
Political subdivisions |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost |  | 23,061
Gross Unrealized Gains |  | 187
Gross Unrealized Losses |  | (151)
Estimated Fair Value |  | 23,097
Hybrid securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Amortized Cost |  | 1,754
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1)
Estimated Fair Value |  | $ 1,753

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