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Investments - Gross Unrealized Gains and Losses and Cost or Amortized Cost, Allowance for Credit Losses and Fair Value of Investments Classified as Available-for-Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale, Amortized Cost	$ 318,495	$ 326,171
Available-for-sale, Gross Unrealized Gains	4,343	2,688
Available-for-sale, Gross Unrealized Losses	(7,724)	(11,795)
Fixed maturity securities-available-for-sale	315,114	317,064
Debt Securities Available For Sale Allowance For Credit Loss	0	0
States and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale, Amortized Cost	147,821	138,031
Available-for-sale, Gross Unrealized Gains	939	583
Available-for-sale, Gross Unrealized Losses	(5,153)	(6,719)
Fixed maturity securities-available-for-sale	143,607	131,895
Corporate Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale, Amortized Cost	151,114	168,134
Available-for-sale, Gross Unrealized Gains	3,404	2,105
Available-for-sale, Gross Unrealized Losses	(1,439)	(3,486)
Fixed maturity securities-available-for-sale	153,079	166,753
U.S. Agency-Based Mortgage-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale, Amortized Cost	4,702	5,190
Available-for-sale, Gross Unrealized Losses	(341)	(445)
Fixed maturity securities-available-for-sale	4,361	4,745
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale, Amortized Cost	14,858	14,816
Available-for-sale, Gross Unrealized Gains		0
Available-for-sale, Gross Unrealized Losses	(791)	(1,145)
Fixed maturity securities-available-for-sale	$ 14,067	$ 13,671

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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