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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | $ 108,725 | $ 196,433
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 5,471 | 10,625
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 177,138 | 63,424
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 20,516 | 7,849
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 285,863 | 259,857
Available-for Sale, Gross Unrealized Losses, Total | 25,987 | 18,474
States and Political Subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 55,911 | 87,522
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 3,207 | 5,319
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 68,237 | 24,980
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 11,271 | 4,507
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 124,148 | 112,502
Available-for Sale, Gross Unrealized Losses, Total | 14,478 | 9,826
Corporate Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 51,905 | 98,590
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 2,247 | 4,549
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 90,991 | 30,011
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 6,977 | 2,108
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 142,896 | 128,601
Available-for Sale, Gross Unrealized Losses, Total | 9,224 | 6,657
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 |  | 4,732
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months |  | 444
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 4,664 | 714
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 712 | 94
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 4,664 | 5,446
Available-for Sale, Gross Unrealized Losses, Total | 712 | 538
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 | 909 | 5,589
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 17 | 313
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 13,246 | 7,719
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 1,556 | 1,140
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 14,155 | 13,308
Available-for Sale, Gross Unrealized Losses, Total | $ 1,573 | $ 1,453

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