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Investments - Gross Unrealized Gains and Losses and Cost or Amortized Cost and Fair Value of Investments Classified as Available-for-Sale (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale, Amortized Cost	$ 324,597,000	$ 387,665,000
Available-for-sale, Gross Unrealized Gains	17,829,000	26,619,000
Available-for-sale, Gross Unrealized Losses	(657,000)	(5,000)
Available-for-sale, Fair Value	341,769,000	414,279,000
Available-for-sale, Allowance for Credit Losses	0	0
Fixed maturity securities, available-for-sale, allowance for credit losses	0	0
States and Political Subdivisions [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale, Amortized Cost	202,008,000	256,492,000
Available-for-sale, Gross Unrealized Gains	14,538,000	20,050,000
Available-for-sale, Gross Unrealized Losses	(240,000)
Available-for-sale, Fair Value	216,306,000	276,542,000
Corporate Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale, Amortized Cost	93,947,000	83,646,000
Available-for-sale, Gross Unrealized Gains	2,751,000	5,256,000
Available-for-sale, Gross Unrealized Losses	(272,000)	(3,000)
Available-for-sale, Fair Value	96,426,000	88,899,000
U.S. Agency-Based Mortgage-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale, Amortized Cost	7,944,000	18,654,000
Available-for-sale, Gross Unrealized Gains	158,000	400,000
Available-for-sale, Gross Unrealized Losses	(13,000)	(2,000)
Available-for-sale, Fair Value	8,089,000	19,052,000
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	20,698,000	28,873,000
Available-for-sale, Gross Unrealized Gains	382,000	913,000
Available-for-sale, Gross Unrealized Losses	(132,000)
Available-for-sale, Fair Value	$ 20,948,000	$ 29,786,000

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- Definition

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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