Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Land	$ 229,398	$ 229,693
Investment Building and Building Improvements	683,450	598,643
Fixtures and Equipment, Gross	457,745	459,975
Leasehold Improvements, Gross	139,568	138,765
Capitalized Computer Software, Gross	354,763	295,428
Property, Plant and Equipment, Gross	1,864,924	1,722,504
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	845,416	817,042
Premises and equipment, net	$ 1,019,508	$ 905,462