Premises and Equipment (Schedule of Premises and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 1,027,041	$ 981,777
Less accumulated depreciation and amortization	608,132	593,039
Net premises and equipment	418,909	388,738
Land [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	89,342	91,003
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	673,802	622,642
Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	237,867	242,455
Right of use leased assets [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 26,030	$ 25,677