Premises and Equipment (Summary of Premises and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Land	$ 12,899	$ 12,987
Buildings and improvements	94,686	95,843
Leasehold improvements	79,917	78,029
Fixtures and equipment	73,686	73,180
Data processing and software	195,308	175,887
Total premises and equipment	456,496	435,926
Less: Accumulated depreciation and amortization	(327,070)	(313,993)
Premises and equipment, net	129,426	121,933
Depreciation and amortization	$ 28,400	$ 27,900	$ 31,100