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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Sep. 30, 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 | $ 288,084 | $ 67,825
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 20,141 | 657
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 34,574 |
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 5,210 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 322,658 | 67,825
Available-for Sale, Gross Unrealized Losses, Total | 25,351 | 657
States and Political Subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 150,390 | 23,465
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 11,587 | 240
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 13,456 |
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 2,614 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 163,846 | 23,465
Available-for Sale, Gross Unrealized Losses, Total | 14,201 | 240
Corporate Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 124,596 | 36,443
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 7,146 | 272
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 15,452 |
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 1,814 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 140,048 | 36,443
Available-for Sale, Gross Unrealized Losses, Total | 8,960 | 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 | 5,120 | 1,146
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 558 | 13
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 458 |
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 71 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 5,578 | 1,146
Available-for Sale, Gross Unrealized Losses, Total | 629 | 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 | 7,978 | 6,771
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 850 | 132
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 5,208 |
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 711 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 13,186 | 6,771
Available-for Sale, Gross Unrealized Losses, Total | $ 1,561 | $ 132

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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 12 months or longer, 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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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