Premises and Equipment (Premises and Equipment) (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Land	$ 245,184	$ 224,290
Buildings	701,415	644,240
Technology, furniture and equipment	255,640	281,697
Leasehold improvements	265,700	250,572
Construction and projects in progress	$ 44,256	$ 24,135
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Premises and Equipment [Member]	Premises and Equipment [Member]
Operating lease, right-of-use asset	$ 259,177	$ 270,282
Premises and equipment, Gross	1,771,372	1,695,216
Less accumulated depreciation and amortization	(458,147)	(449,839)
Total premises and equipment, net	$ 1,313,225	$ 1,245,377