Premises and Equipment (Major Classifications) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 1,474,118	$ 1,432,662
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	597,596	549,894
Property, Plant and Equipment, Net	876,522	882,768
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	204,259	202,168
Premises and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	875,511	840,149
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 394,348	$ 390,345