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Bank Premises and Equipment - Bank Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, Gross $ 473,326 $ 422,268
Less allowance for depreciation and amortization (264,495) (236,137)
Bank premises and equipment 208,831 186,131
Land [Member]    
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, Gross 69,573 62,506
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, Gross 234,963 206,281
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, Gross 45,727 43,971
Furniture, Fixtures and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, Gross $ 123,063 $ 109,510