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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, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale, Amortized Cost	$ 331,798	$ 338,593
Available-for-sale, Gross Unrealized Gains	229	1,002
Available-for-sale, Gross Unrealized Losses	(25,987)	(18,474)
Fixed maturity securities-available-for-sale	306,040	321,121
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	138,627	166,019
Available-for-sale, Gross Unrealized Gains		463
Available-for-sale, Gross Unrealized Losses	(14,478)	(9,826)
Fixed maturity securities-available-for-sale	124,149	156,656
Corporate Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale, Amortized Cost	172,066	150,915
Available-for-sale, Gross Unrealized Gains	229	530
Available-for-sale, Gross Unrealized Losses	(9,224)	(6,657)
Fixed maturity securities-available-for-sale	163,071	144,788
U.S. Agency-Based Mortgage-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale, Amortized Cost	5,376	5,984
Available-for-sale, Gross Unrealized Losses	(712)	(538)
Fixed maturity securities-available-for-sale	4,664	5,446
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	15,729	15,675
Available-for-sale, Gross Unrealized Gains		9
Available-for-sale, Gross Unrealized Losses	(1,573)	(1,453)
Fixed maturity securities-available-for-sale	$ 14,156	$ 14,231

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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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