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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands | Jun. 30, 2024 USD ($) Investments | Dec. 31, 2023 USD ($) Investments
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Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 144 | 155
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 92,344 | $ 6,324
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 940 | 97
Available-for-sale Securities, 12 Months or Longer, Fair Value | 1,322,533 | 1,436,062
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 62,418 | 66,004
Available-for-sale Securities, Fair Value, Total | 1,414,877 | 1,442,386
Available-for-sale Securities, Unrealized Losses, Total | $ 63,358 | $ 66,101
U.S. Treasuries [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 62 | 68
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 90,084 | $ 4,838
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 926 | 90
Available-for-sale Securities, 12 Months or Longer, Fair Value | 1,300,697 | 1,401,669
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 59,207 | 62,545
Available-for-sale Securities, Fair Value, Total | 1,390,781 | 1,406,507
Available-for-sale Securities, Unrealized Losses, Total | $ 60,133 | $ 62,635
U.S. Federal Agencies [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 2 | 3
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 205 | $ 1,100
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 2 | 3
Available-for-sale Securities, 12 Months or Longer, Fair Value | 688 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 1 |
Available-for-sale Securities, Fair Value, Total | 893 | 1,100
Available-for-sale Securities, Unrealized Losses, Total | $ 3 | $ 3
Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 69 | 74
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 1,188 | $ 80
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 9 |
Available-for-sale Securities, 12 Months or Longer, Fair Value | 12,455 | 13,261
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 1,737 | 1,677
Available-for-sale Securities, Fair Value, Total | 13,643 | 13,341
Available-for-sale Securities, Unrealized Losses, Total | $ 1,746 | $ 1,677
States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 8 | 6
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 867 | $ 306
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 3 | 4
Available-for-sale Securities, 12 Months or Longer, Fair Value | 1,871 | 1,847
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 132 | 110
Available-for-sale Securities, Fair Value, Total | 2,738 | 2,153
Available-for-sale Securities, Unrealized Losses, Total | $ 135 | $ 114
Asset backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments |  | 1
Available-for-sale Securities, 12 Months or Longer, Fair Value |  | $ 12,512
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses |  | 282
Available-for-sale Securities, Fair Value, Total |  | 12,512
Available-for-sale Securities, Unrealized Losses, Total |  | $ 282
Other Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 3 | 3
Available-for-sale Securities, 12 Months or Longer, Fair Value | $ 6,822 | $ 6,773
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 1,341 | 1,390
Available-for-sale Securities, Fair Value, Total | 6,822 | 6,773
Available-for-sale Securities, Unrealized Losses, Total | $ 1,341 | $ 1,390

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