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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | $ 157,759 | $ 40,293
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 8,646 | 207
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 74,761 | 184,313
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 4,838 | 11,588
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 232,520 | 224,606
Available-for Sale, Gross Unrealized Losses, Total | 13,484 | 11,795
States and Political Subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 77,323 | 14,115
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 5,454 | 111
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 22,698 | 72,358
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 2,132 | 6,608
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 100,021 | 86,473
Available-for Sale, Gross Unrealized Losses, Total | 7,586 | 6,719
Corporate Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 76,321 | 26,178
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 2,718 | 96
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 38,179 | 93,538
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 1,475 | 3,390
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 114,500 | 119,716
Available-for Sale, Gross Unrealized Losses, Total | 4,193 | 3,486
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 | 4,115 | 0
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 474 | 0
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 230 | 4,745
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 41 | 445
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 4,345 | 4,745
Available-for Sale, Gross Unrealized Losses, Total | 515 | 445
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 | 0 | 0
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 0 | 0
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 13,654 | 13,672
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 1,190 | 1,145
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 13,654 | 13,672
Available-for Sale, Gross Unrealized Losses, Total | $ 1,190 | $ 1,145

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