Premises and Equipment (Schedule of Premises and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 1,090,607	$ 1,027,041
Less accumulated depreciation and amortization	621,548	608,132
Net premises and equipment	469,059	418,909
Land [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	88,564	89,342
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	730,445	673,802
Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	244,636	237,867
Right of use leased assets [Member]
Property, Plant and Equipment [Line Items]
Gross land, buildings and equipment	$ 26,962	$ 26,030