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Investment Securities - Summary of Debt Securities in Unrealized Loss position for Which Allowance for Credit Losses Not Recorded (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 46,327 | $ 61,022
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (702) | (1,215)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 65,244 | 64,629
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (6,332) | (6,464)
Available-for-sale Securities, Fair Value, Total | 111,571 | 125,651
Available-for-sale Securities, Unrealized Losses, Total | (7,034) | (7,679)
US Government Agency securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 3,982 | 3,960
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (18) | (40)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 0 | 0
Available-for-sale Securities, Fair Value, Total | 3,982 | 3,960
Available-for-sale Securities, Unrealized Losses, Total | (18) | (40)
Obligations of state and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 10,961 | 11,433
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (309) | (273)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 33,554 | 34,345
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (4,146) | (3,790)
Available-for-sale Securities, Fair Value, Total | 44,515 | 45,778
Available-for-sale Securities, Unrealized Losses, Total | (4,455) | (4,063)
Mortgage-backed securities in government-sponsored entities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 31,384 | 45,629
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | (375) | (902)
Available-for-sale Securities, 12 Months or Longer, Fair Value | 31,339 | 29,877
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (2,179) | (2,665)
Available-for-sale Securities, Fair Value, Total | 62,723 | 75,506
Available-for-sale Securities, Unrealized Losses, Total | (2,554) | (3,567)
Other securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 0 | 0
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 0 | 0
Available-for-sale Securities, 12 Months or Longer, Fair Value | 351 | 407
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | (7) | (9)
Available-for-sale Securities, Fair Value, Total | 351 | 407
Available-for-sale Securities, Unrealized Losses, Total | $ (7) | $ (9)

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