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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, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | $ 351,118 | $ 324,597
Available-for-sale, Gross Unrealized Gains | 124 | 17,829
Available-for-sale, Gross Unrealized Losses | (25,351) | (657)
Fixed maturity securities-available-for-sale | 325,891 | 341,769
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 | 180,244 | 202,008
Available-for-sale, Gross Unrealized Gains | 118 | 14,538
Available-for-sale, Gross Unrealized Losses | (14,201) | (240)
Fixed maturity securities-available-for-sale | 166,161 | 216,306
Corporate Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | 149,008 | 93,947
Available-for-sale, Gross Unrealized Gains |  | 2,751
Available-for-sale, Gross Unrealized Losses | (8,960) | (272)
Fixed maturity securities-available-for-sale | 140,048 | 96,426
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | 6,208 | 7,944
Available-for-sale, Gross Unrealized Gains |  | 158
Available-for-sale, Gross Unrealized Losses | (629) | (13)
Fixed maturity securities-available-for-sale | 5,579 | 8,089
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 | 15,658 | 20,698
Available-for-sale, Gross Unrealized Gains | 6 | 382
Available-for-sale, Gross Unrealized Losses | (1,561) | (132)
Fixed maturity securities-available-for-sale | $ 14,103 | $ 20,948

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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