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Schedule II. Condensed Financial Information of Registrant - Condensed Balance Sheets (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Condensed Balance Sheet Statements, Captions [Line Items] |  |
Fixed maturity securities, amortized cost | $ 326,171 | $ 338,593
Equity securities, cost | 44,046 | 50,185
Net of Treasury stock | 36,929 | 34,758
Parent Company [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Fixed maturity securities, amortized cost | 24,309 | 19,824
Equity securities, cost | 7,108 | 10,007
Net of Treasury stock | $ 36,929 | $ 34,758

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