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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Sep. 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 | $ 95,873 | $ 40,293
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 4,693 | 207
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 60,983 | 184,313
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 3,031 | 11,588
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 156,856 | 224,606
Available-for Sale, Gross Unrealized Losses, Total | 7,724 | 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 | 61,392 | 14,115
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 3,595 | 111
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 21,334 | 72,358
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 1,558 | 6,608
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 82,726 | 86,473
Available-for Sale, Gross Unrealized Losses, Total | 5,153 | 6,719
Corporate Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 30,359 | 26,178
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 786 | 96
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 25,343 | 93,538
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 653 | 3,390
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 55,702 | 119,716
Available-for Sale, Gross Unrealized Losses, Total | 1,439 | 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 | 4,122 | 0
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 312 | 0
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 239 | 4,745
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 29 | 445
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 4,361 | 4,745
Available-for Sale, Gross Unrealized Losses, Total | 341 | 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 | 14,067 | 13,672
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 791 | 1,145
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 14,067 | 13,672
Available-for Sale, Gross Unrealized Losses, Total | $ 791 | $ 1,145

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