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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 ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | $ 342,784 | $ 324,597
Available-for-sale, Gross Unrealized Gains | 5,338 | 17,829
Available-for-sale, Gross Unrealized Losses | (5,150) | (657)
Available-for-sale, Fair Value | 342,972 | 341,769
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 | 200,313 | 202,008
Available-for-sale, Gross Unrealized Gains | 4,541 | 14,538
Available-for-sale, Gross Unrealized Losses | (2,618) | (240)
Available-for-sale, Fair Value | 202,236 | 216,306
Corporate Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | 114,642 | 93,947
Available-for-sale, Gross Unrealized Gains | 780 | 2,751
Available-for-sale, Gross Unrealized Losses | (1,723) | (272)
Available-for-sale, Fair Value | 113,699 | 96,426
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | 7,117 | 7,944
Available-for-sale, Gross Unrealized Gains |  | 158
Available-for-sale, Gross Unrealized Losses | (155) | (13)
Available-for-sale, Fair Value | 6,962 | 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 | 20,712 | 20,698
Available-for-sale, Gross Unrealized Gains | 17 | 382
Available-for-sale, Gross Unrealized Losses | (654) | (132)
Available-for-sale, Fair Value | $ 20,075 | $ 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 http://asc.fasb.org/extlink&oid=123581744&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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amortized cost of 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 -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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