Employee Benefit Plans (Net Periodic Benefit Cost (Benefit)) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Retirement Benefits [Abstract]
Expected return on plan assets, net of expenses	$ (9,366)	$ (9,645)	$ (10,959)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Total non-interest expense	Total non-interest expense	Total non-interest expense
Interest cost on projected benefit obligation	$ 6,619	$ 6,647	$ 6,983
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Total non-interest expense	Total non-interest expense	Total non-interest expense
Net amortization and deferral	$ 1,239	$ 1,673	$ 3,479
Net periodic expense (benefit)	$ (1,508)	$ (1,325)	$ (497)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Total non-interest expense	Total non-interest expense	Total non-interest expense