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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
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)