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Condensed Financial Information - Parent Company Only Income statement (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]      
Total Non-Interest Income $ 207,974 $ 190,178 $ 181,839
Income Before Income Taxes 234,454 208,249 199,423
Income tax benefit 62,701 46,624 49,921
Net Income 171,753 161,625 149,502
Parent      
Condensed Financial Statements, Captions [Line Items]      
Dividends from subsidiaries 66,500 115,000 114,000
Other (1) 171,490 148,577 141,241
Total Non-Interest Income 237,990 263,577 255,241
Expenses 199,981 177,835 176,457
Income Before Income Taxes 38,009 85,742 78,784
Income tax benefit (5,448) (10,543) (11,834)
Income before equity in undistributed income of subsidiaries 43,457 96,285 90,618
Net Income 171,753 161,625 149,502
Parent | Bank subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Non-bank subsidiaries 111,226 58,477 60,806
Parent | Non-bank subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Non-bank subsidiaries $ 17,070 $ 6,863 $ (1,922)