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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)

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