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Schedule II. Condensed Financial Information of Registrant - Condensed Balance Sheets (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Fixed maturity securities, amortized cost | $ 338,593 | $ 324,597
Equity securities, cost | 50,185 | 44,175
Net of Treasury stock | 34,758 | 22,370
Parent Company [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Fixed maturity securities, amortized cost | 19,824 | 19,650
Equity securities, cost | 10,007 | 10,007
Net of Treasury stock | $ 34,758 | $ 22,370

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