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Employee Benefit Plans - Net Periodic Pension Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,293	$ 1,387	$ 1,440
Interest cost	$ 7,427	6,967	7,134
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest Expense, Deposits
Expected return on plan assets	$ (11,046)	(10,659)	(11,762)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest and Dividend Income, Operating
Amortization of net actuarial loss	$ 69	2,315	3,347
Net periodic pension cost (income)	$ (2,257)	$ 10	$ 159
Weighted-Average Assumptions:
Discount rate	5.76%	5.07%	5.26%
Expected return on assets	6.15%	6.25%	7.25%
Prior to Age 40 [Member]
Weighted-Average Assumptions:
Rate of Compensation increase	6.00%	5.00%	5.00%
Ages 40-49 [Member]
Weighted-Average Assumptions:
Rate of Compensation increase	5.50%
Ages 40-54 [Member]
Weighted-Average Assumptions:
Rate of Compensation increase		4.00%	4.00%
Ages 50-54 [Member]
Weighted-Average Assumptions:
Rate of Compensation increase	5.00%
Ages 55-64 [Member]
Weighted-Average Assumptions:
Rate of Compensation increase	4.00%
Otherwise [Member]
Weighted-Average Assumptions:
Rate of Compensation increase	3.00%	3.50%	3.50%

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