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Fair Values of Financial Instruments - Summary of Carrying or Reported Values and Corresponding Fair Values for Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities--held-to-maturity	$ 399,721	$ 473,092
Fixed maturity securities-available-for-sale, at fair value (amortized cost $318,975, allowance for credit losses of $0 in 2024 and amortized cost $326,171, allowance for credit losses of $0 in 2023)	307,750	317,064
Equity securities, at fair value (cost $36,020 and $44,046 in 2024 and 2023, respectively)	58,629	57,147
Short-term investments	9,338
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities--held-to-maturity	413,061	483,575
Fixed maturity securities-available-for-sale, at fair value (amortized cost $318,975, allowance for credit losses of $0 in 2024 and amortized cost $326,171, allowance for credit losses of $0 in 2023)	307,750	317,064
Equity securities, at fair value (cost $36,020 and $44,046 in 2024 and 2023, respectively)	58,629	57,147
Short-term investments	9,338
Cash and cash equivalents	44,045	38,682
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities--held-to-maturity	399,721	473,092
Fixed maturity securities-available-for-sale, at fair value (amortized cost $318,975, allowance for credit losses of $0 in 2024 and amortized cost $326,171, allowance for credit losses of $0 in 2023)	307,750	317,064
Equity securities, at fair value (cost $36,020 and $44,046 in 2024 and 2023, respectively)	58,629	57,147
Short-term investments	9,338
Cash and cash equivalents	$ 44,045	$ 38,682

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