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Fair Values of Financial Instruments - Summary of Carrying Amounts and Corresponding Fair Values for Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities, fair value	$ 371,355	$ 399,721
Fixed maturity securities-available-for-sale	306,715	307,750
Equity securities	52,451	58,629
Short-term investments	14,900	9,338
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities, fair value	384,822	413,061
Fixed maturity securities-available-for-sale	306,715	307,750
Equity securities	52,451	58,629
Short-term investments	14,900	9,338
Cash and cash equivalents	48,465	44,045
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities, fair value	371,355	399,721
Fixed maturity securities-available-for-sale	306,715	307,750
Equity securities	52,451	58,629
Short-term investments	14,900	9,338
Cash and cash equivalents	$ 48,465	$ 44,045

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