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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Marketable Securities [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 207 | $ 10,625
Held-to-Maturity, Gross Unrealized Losses, Total | 11,795 | 18,474
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 40,293 | 196,433
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 207 | 10,625
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 184,313 | 63,424
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 11,588 | 7,849
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 224,606 | 259,857
Corporate Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 96 | 4,549
Held-to-Maturity, Gross Unrealized Losses, Total | 3,486 | 6,657
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 26,178 | 98,590
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 96 | 4,549
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 93,538 | 30,011
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 3,390 | 2,108
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 119,716 | 128,601
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Marketable Securities [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 444
Held-to-Maturity, Gross Unrealized Losses, Total | 445 | 538
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 | 4,745 | 714
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 445 | 94
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 4,745 | 5,446
States and Political Subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 111 | 5,319
Held-to-Maturity, Gross Unrealized Losses, Total | 6,719 | 9,826
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 14,115 | 87,522
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 111 | 5,319
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 72,358 | 24,980
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 6,608 | 4,507
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 86,473 | 112,502
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Marketable Securities [Line Items] |  |
Held-to-Maturity, Gross Unrealized Losses, Less Than 12 Months |  | 313
Held-to-Maturity, Gross Unrealized Losses, Total | 1,145 | 1,453
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months |  | 5,589
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 13,672 | 7,719
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 1,145 | 1,140
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | $ 13,672 | $ 13,308

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