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Schedule II. Condensed Financial Information of Registrant - Condensed Balance Sheets (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Condensed Balance Sheet Statements, Captions [Line Items] |  |
Fixed maturity securities, amortized cost | $ 318,975 | $ 326,171
Equity securities, cost | 36,020 | 44,046
Net of Treasury stock | 42,052 | 36,929
Parent Company [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Fixed maturity securities, amortized cost | 4,988 | 24,309
Equity securities, cost | 5,110 | 7,108
Net of Treasury stock | $ 42,052 | $ 36,929

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