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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Jun. 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 | $ 146,022 | $ 196,433
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 3,198 | 10,625
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 131,884 | 63,424
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 13,176 | 7,849
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 277,906 | 259,857
Available-for Sale, Gross Unrealized Losses, Total | 16,374 | 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 | 46,548 | 87,522
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 441 | 5,319
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 62,315 | 24,980
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 7,899 | 4,507
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 108,863 | 112,502
Available-for Sale, Gross Unrealized Losses, Total | 8,340 | 9,826
Corporate Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 98,553 | 98,590
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 2,755 | 4,549
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 51,149 | 30,011
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 3,311 | 2,108
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 149,702 | 128,601
Available-for Sale, Gross Unrealized Losses, Total | 6,066 | 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 | 5,062 | 714
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 536 | 94
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 5,062 | 5,446
Available-for Sale, Gross Unrealized Losses, Total | 536 | 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 | 921 | 5,589
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 2 | 313
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 13,358 | 7,719
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 1,430 | 1,140
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 14,279 | 13,308
Available-for Sale, Gross Unrealized Losses, Total | $ 1,432 | $ 1,453

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