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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands | Dec. 31, 2023 USD ($) Investments | Dec. 31, 2022 USD ($) Investments
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Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 155 | 179
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 6,324 | $ 818,115
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 97 | 29,153
Available-for-sale Securities, 12 Months or Longer, Fair Value | 1,436,062 | 698,341
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 66,004 | 64,771
Available-for-sale Securities, Fair Value, Total | 1,442,386 | 1,516,456
Available-for-sale Securities, Unrealized Losses, Total | $ 66,101 | $ 93,924
U.S. Treasuries [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 68 | 74
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 4,838 | $ 787,925
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 90 | 27,078
Available-for-sale Securities, 12 Months or Longer, Fair Value | 1,401,669 | 689,939
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 62,545 | 63,621
Available-for-sale Securities, Fair Value, Total | 1,406,507 | 1,477,864
Available-for-sale Securities, Unrealized Losses, Total | $ 62,635 | $ 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 | $ 1,100 |
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 | 1,100 | 349
Available-for-sale Securities, Unrealized Losses, Total | $ 3 | $ 1
Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 74 | 92
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 80 | $ 10,001
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | 1,239
Available-for-sale Securities, 12 Months or Longer, Fair Value | 13,261 | 5,055
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 1,677 | 645
Available-for-sale Securities, Fair Value, Total | 13,341 | 15,056
Available-for-sale Securities, Unrealized Losses, Total | $ 1,677 | $ 1,884
States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 6 | 8
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 306 | $ 2,308
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 4 | 184
Available-for-sale Securities, 12 Months or Longer, Fair Value | 1,847 | 464
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 110 | 37
Available-for-sale Securities, Fair Value, Total | 2,153 | 2,772
Available-for-sale Securities, Unrealized Losses, Total | $ 114 | $ 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 | $ 12,512 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 282 |
Available-for-sale Securities, Fair Value, Total | 12,512 | 13,010
Available-for-sale Securities, Unrealized Losses, Total | $ 282 | $ 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 | $ 6,773 | 2,534
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 1,390 | 467
Available-for-sale Securities, Fair Value, Total | 6,773 | 7,405
Available-for-sale Securities, Unrealized Losses, Total | $ 1,390 | $ 758

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