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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands | Sep. 30, 2023 USD ($) Investments | Dec. 31, 2022 USD ($) Investments
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Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 170 | 179
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 97,531 | $ 818,115
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 2,770 | 29,153
Available-for-sale Securities, 12 Months or Longer, Fair Value | 1,408,140 | 698,341
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 98,447 | 64,771
Available-for-sale Securities, Fair Value, Total | 1,505,671 | 1,516,456
Available-for-sale Securities, Unrealized Losses, Total | $ 101,217 | $ 93,924
U.S. Treasuries [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 71 | 74
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 93,372 | $ 787,925
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 2,708 | 27,078
Available-for-sale Securities, 12 Months or Longer, Fair Value | 1,374,832 | 689,939
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 94,022 | 63,621
Available-for-sale Securities, Fair Value, Total | 1,468,204 | 1,477,864
Available-for-sale Securities, Unrealized Losses, Total | $ 96,730 | $ 90,699
U.S. Federal Agencies [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 3 | 1
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 1,260 |
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 3 |
Available-for-sale Securities, 12 Months or Longer, Fair Value |  | $ 349
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses |  | 1
Available-for-sale Securities, Fair Value, Total | 1,260 | 349
Available-for-sale Securities, Unrealized Losses, Total | $ 3 | $ 1
Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 83 | 92
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 1,242 | $ 10,001
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 38 | 1,239
Available-for-sale Securities, 12 Months or Longer, Fair Value | 12,887 | 5,055
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 2,434 | 645
Available-for-sale Securities, Fair Value, Total | 14,129 | 15,056
Available-for-sale Securities, Unrealized Losses, Total | $ 2,472 | $ 1,884
States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 9 | 8
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 1,657 | $ 2,308
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 21 | 184
Available-for-sale Securities, 12 Months or Longer, Fair Value | 1,292 | 464
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 168 | 37
Available-for-sale Securities, Fair Value, Total | 2,949 | 2,772
Available-for-sale Securities, Unrealized Losses, Total | $ 189 | $ 221
Asset backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 1 | 1
Available-for-sale Securities, Less than 12 Months, Fair Value |  | $ 13,010
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | 361
Available-for-sale Securities, 12 Months or Longer, Fair Value | $ 12,411 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 378 |
Available-for-sale Securities, Fair Value, Total | 12,411 | 13,010
Available-for-sale Securities, Unrealized Losses, Total | $ 378 | $ 361
Other Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 3 | 3
Available-for-sale Securities, Less than 12 Months, Fair Value |  | $ 4,871
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | 291
Available-for-sale Securities, 12 Months or Longer, Fair Value | $ 6,718 | 2,534
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 1,445 | 467
Available-for-sale Securities, Fair Value, Total | 6,718 | 7,405
Available-for-sale Securities, Unrealized Losses, Total | $ 1,445 | $ 758

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