Retirement Plans - Components of Net Periodic Pension Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Interest cost	$ 360	$ 454	$ 392
Expected return on plan assets	$ (767)	$ (605)	$ (732)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Noninterest Expense	Other Noninterest Expense	Other Noninterest Expense
Net periodic pension cost (benefit)	$ (407)	$ (151)	$ (340)
Total pension cost (benefit)	(407)	(151)	(340)
Net loss (gain) recognized in other comprehensive income	0	(972)	(736)
Total recognized in net periodic benefit cost and other comprehensive loss (before tax)	$ (407)	$ (1,123)	$ (1,076)