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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | $ 150,460 | $ 67,825
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 5,150 | 657
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 150,460 | 67,825
Available-for Sale, Gross Unrealized Losses, Total | 5,150 | 657
States and Political Subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 62,574 | 23,465
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 2,618 | 240
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 62,574 | 23,465
Available-for Sale, Gross Unrealized Losses, Total | 2,618 | 240
Corporate Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 66,857 | 36,443
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 1,723 | 272
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 66,857 | 36,443
Available-for Sale, Gross Unrealized Losses, Total | 1,723 | 272
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 6,962 | 1,146
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 155 | 13
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 6,962 | 1,146
Available-for Sale, Gross Unrealized Losses, Total | 155 | 13
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 14,067 | 6,771
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 654 | 132
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 14,067 | 6,771
Available-for Sale, Gross Unrealized Losses, Total | $ 654 | $ 132

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 + Details
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