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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands | Sep. 30, 2024 USD ($) Investments | Dec. 31, 2023 USD ($) Investments
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Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 115 | 155
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 699 | $ 6,324
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 3 | 97
Available-for-sale Securities, 12 Months or Longer, Fair Value | 1,259,896 | 1,436,062
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 33,647 | 66,004
Available-for-sale Securities, Fair Value, Total | 1,260,595 | 1,442,386
Available-for-sale Securities, Unrealized Losses, Total | $ 33,650 | $ 66,101
U.S. Treasuries [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 54 | 68
Available-for-sale Securities, Less than 12 Months, Fair Value |  | $ 4,838
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | 90
Available-for-sale Securities, 12 Months or Longer, Fair Value | $ 1,238,833 | 1,401,669
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 31,363 | 62,545
Available-for-sale Securities, Fair Value, Total | 1,238,833 | 1,406,507
Available-for-sale Securities, Unrealized Losses, Total | $ 31,363 | $ 62,635
U.S. Federal Agencies [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 3 | 3
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 699 | $ 1,100
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 3 | 3
Available-for-sale Securities, 12 Months or Longer, Fair Value | 653 |
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 1 |
Available-for-sale Securities, Fair Value, Total | 1,352 | 1,100
Available-for-sale Securities, Unrealized Losses, Total | $ 4 | $ 3
Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 53 | 74
Available-for-sale Securities, Less than 12 Months, Fair Value |  | $ 80
Available-for-sale Securities, 12 Months or Longer, Fair Value | $ 12,407 | 13,261
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 1,230 | 1,677
Available-for-sale Securities, Fair Value, Total | 12,407 | 13,341
Available-for-sale Securities, Unrealized Losses, Total | $ 1,230 | $ 1,677
States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 2 | 6
Available-for-sale Securities, Less than 12 Months, Fair Value |  | $ 306
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | 4
Available-for-sale Securities, 12 Months or Longer, Fair Value | $ 796 | 1,847
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 97 | 110
Available-for-sale Securities, Fair Value, Total | 796 | 2,153
Available-for-sale Securities, Unrealized Losses, Total | $ 97 | $ 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 | $ 7,207 | $ 6,773
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 956 | 1,390
Available-for-sale Securities, Fair Value, Total | 7,207 | 6,773
Available-for-sale Securities, Unrealized Losses, Total | $ 956 | $ 1,390

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