Premises and Equipment (Schedule of Premises and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 1,148,188	$ 1,108,220
Less accumulated depreciation and amortization	662,488	632,945
Net premises and equipment	485,700	475,275
Land [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	86,278	86,378
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	778,615	750,464
Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	251,769	240,046
Right of use leased assets [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 31,526	$ 31,332