Condensed Financial Information - Parent Company Only Income statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Total Non-Interest Income	$ 181,839	$ 167,379	$ 187,664
Income Before Income Taxes	199,423	210,500	212,925
Income tax benefit	49,921	52,606	51,085
Net Income	149,502	157,894	161,840
Parent
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiaries	114,000	139,150	114,438
Other (1)	141,241	120,543	106,297
Total Non-Interest Income	255,241	259,693	220,735
Expenses	176,457	152,243	138,164
Income Before Income Taxes	78,784	107,450	82,571
Income tax benefit	(11,834)	(10,549)	(10,744)
Income before equity in undistributed income of subsidiaries	90,618	117,999	93,315
Net Income	149,502	157,894	161,840
Parent | Bank subsidiaries
Condensed Financial Statements, Captions [Line Items]
Non-bank subsidiaries	60,806	33,134	56,552
Parent | Non-bank subsidiaries
Condensed Financial Statements, Captions [Line Items]
Non-bank subsidiaries	$ (1,922)	$ 6,761	$ 11,973