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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
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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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- 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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