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Investments - Investment Securities Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Marketable Securities [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 7,984 | $ 207
Held-to-Maturity, Gross Unrealized Losses, Total | 12,621 | 11,795
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 175,099 | 40,293
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 7,984 | 207
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 60,615 | 184,313
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 4,637 | 11,588
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 235,714 | 224,606
Corporate Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,790 | 96
Held-to-Maturity, Gross Unrealized Losses, Total | 2,783 | 3,486
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 71,069 | 26,178
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 1,790 | 96
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 19,000 | 93,538
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 993 | 3,390
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 90,069 | 119,716
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 | 446 |
Held-to-Maturity, Gross Unrealized Losses, Total | 486 | 445
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 3,840 |
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 446 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 219 | 4,745
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 40 | 445
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 4,059 | 4,745
States and Political Subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5,748 | 111
Held-to-Maturity, Gross Unrealized Losses, Total | 8,430 | 6,719
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 100,190 | 14,115
Available-for Sale, Gross Unrealized Losses, Less Than 12 Months | 5,748 | 111
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 27,446 | 72,358
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 2,682 | 6,608
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | 127,636 | 86,473
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 | 0 |
Held-to-Maturity, Gross Unrealized Losses, Total | 922 | 1,145
Available-for Sale, Fair value of Investments with Unrealized Losses, Less Than 12 Months | 0 |
Available-for Sale, Fair Value of Investments with Unrealized Losses, 12 Months or Greater | 13,950 | 13,672
Available-for Sale, Gross Unrealized Losses, 12 Months or Greater | 922 | 1,145
Available-for Sale, Fair Value of Investments with Unrealized Losses, Total | $ 13,950 | $ 13,672

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