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Securities - Summary of Debt Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) $ in Thousands | Sep. 30, 2025 USD ($) Investments | Dec. 31, 2024 USD ($) Investments
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Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 98 | 126
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 1,235 | $ 92,564
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 5 | 1,051
Available-for-sale Securities, 12 Months or Longer, Fair Value | 911,809 | 1,106,088
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 17,660 | 42,083
Available-for-sale Securities, Fair Value, Total | 913,044 | 1,198,652
Available-for-sale Securities, Unrealized Losses, Total | $ 17,665 | $ 43,134
U.S. Treasuries [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 36 | 51
Available-for-sale Securities, Less than 12 Months, Fair Value |  | $ 89,867
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | 1,030
Available-for-sale Securities, 12 Months or Longer, Fair Value | $ 892,559 | 1,086,142
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 15,489 | 39,219
Available-for-sale Securities, Fair Value, Total | 892,559 | 1,176,009
Available-for-sale Securities, Unrealized Losses, Total | $ 15,489 | $ 40,249
U.S. Federal Agencies [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 6 | 5
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 724 | $ 681
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 5 | 4
Available-for-sale Securities, 12 Months or Longer, Fair Value | 409 | 500
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 2 | 2
Available-for-sale Securities, Fair Value, Total | 1,133 | 1,181
Available-for-sale Securities, Unrealized Losses, Total | $ 7 | $ 6
Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 51 | 63
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 11 | $ 1,214
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | 15
Available-for-sale Securities, 12 Months or Longer, Fair Value | 10,917 | 11,498
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 1,212 | 1,757
Available-for-sale Securities, Fair Value, Total | 10,928 | 12,712
Available-for-sale Securities, Unrealized Losses, Total | $ 1,212 | $ 1,772
States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 3 | 4
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 500 | $ 802
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | 2
Available-for-sale Securities, 12 Months or Longer, Fair Value | 766 | 752
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 114 | 138
Available-for-sale Securities, Fair Value, Total | 1,266 | 1,554
Available-for-sale Securities, Unrealized Losses, Total | $ 114 | $ 140
Other Securities [Member] |  |
Debt Securities, Available-for-Sale [Abstract] |  |
Number of investments | Investments | 2 | 3
Available-for-sale Securities, 12 Months or Longer, Fair Value | $ 7,158 | $ 7,196
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 843 | 967
Available-for-sale Securities, Fair Value, Total | 7,158 | 7,196
Available-for-sale Securities, Unrealized Losses, Total | $ 843 | $ 967

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