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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 ($) | Jun. 30, 2020 | Dec. 31, 2019
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Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | $ 392,117,000 | $ 425,698,000
Available-for-sale, Gross Unrealized Gains | 24,170,000 | 15,613,000
Available-for-sale, Gross Unrealized Losses | (47,000) | (165,000)
Available-for-sale, Fair Value | 416,240,000 | 441,146,000
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 | 227,932,000 | 225,895,000
Available-for-sale, Gross Unrealized Gains | 16,750,000 | 11,906,000
Available-for-sale, Gross Unrealized Losses |  | (26,000)
Available-for-sale, Fair Value | 244,682,000 | 237,775,000
Corporate Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | 103,713,000 | 130,453,000
Available-for-sale, Gross Unrealized Gains | 5,711,000 | 3,326,000
Available-for-sale, Gross Unrealized Losses | (47,000) | (1,000)
Available-for-sale, Fair Value | 109,377,000 | 133,778,000
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale, Amortized Cost | 28,581,000 | 29,499,000
Available-for-sale, Gross Unrealized Gains | 575,000 | 64,000
Available-for-sale, Gross Unrealized Losses |  | (96,000)
Available-for-sale, Fair Value | 29,156,000 | 29,467,000
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 | 31,891,000 | 39,851,000
Available-for-sale, Gross Unrealized Gains | 1,134,000 | 317,000
Available-for-sale, Gross Unrealized Losses |  | (42,000)
Available-for-sale, Fair Value | $ 33,025,000 | $ 40,126,000

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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). + 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=118939692&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=118939692&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=118939692&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=118942338&loc=SL82898722-210454 + Details
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