Condensed Financial Information - Parent Company Only Income statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Total Non-Interest Income	$ 190,178	$ 181,839	$ 167,379
Income Before Income Taxes	208,249	199,423	210,500
Income tax benefit	46,624	49,921	52,606
Net Income	161,625	149,502	157,894
Parent
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiaries	115,000	114,000	139,150
Other (1)	148,577	141,241	120,543
Total Non-Interest Income	263,577	255,241	259,693
Expenses	177,835	176,457	152,243
Income Before Income Taxes	85,742	78,784	107,450
Income tax benefit	(10,543)	(11,834)	(10,549)
Income before equity in undistributed income of subsidiaries	96,285	90,618	117,999
Net Income	161,625	149,502	157,894
Parent | Bank subsidiaries
Condensed Financial Statements, Captions [Line Items]
Non-bank subsidiaries	58,477	60,806	33,134
Parent | Non-bank subsidiaries
Condensed Financial Statements, Captions [Line Items]
Non-bank subsidiaries	$ 6,863	$ (1,922)	$ 6,761