Premises and Equipment (Narrative) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Depreciation	$ 67,300	$ 61,900	$ 60,600
Operating Lease, Rent Expense	51,900	49,700	50,500
Operating Lease, Right-of-Use Asset	259,177	270,282
Right-of-use lease asset related liability	296,400	308,100
Operating lease, payments	37,100	33,700
Partnership Interest [Member]
Property, Plant and Equipment [Line Items]
Operating Lease, Rent Expense	$ 375	$ 349	$ 337