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Parent Company Only Financial Statements Parent Company Only Financial Statements, Condensed Balance Sheet Statement (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Assets [Abstract]        
Cash and cash equivalents $ 2,537,497 $ 2,643,599 $ 2,475,842 $ 1,087,213
Available for sale securities 8,676,829 9,042,733    
Other assets 353,017 249,112    
Total assets 32,772,281 31,476,128    
Liabilities [Abstract]        
Other liabilities 182,784 124,284    
Subordinated debentures 144,640 226,350    
Total liabilities 29,465,924 28,208,489    
Shareholders' equity: [Abstract]        
Common stock 4 4    
Capital surplus 1,006,535 982,009    
Retained earnings 2,823,334 2,704,121    
Treasury stock (544,052) (477,165)    
Accumulated other comprehensive income (loss) (10,967) 21,587 56,673 (25,623)
Total shareholders’ equity 3,274,854 3,230,556    
Total liabilities and shareholders’ equity 32,772,281 31,476,128    
Parent Company [Member]        
Assets [Abstract]        
Cash and cash equivalents 163,418 282,169 $ 510,668 $ 561,297
Available for sale securities 19,234 20,150    
Investment in bank subsidiaries 3,067,595 2,746,810    
Investment in non-bank subsidiaries 177,068 186,271    
Other assets 4,865 1,534    
Total assets 3,432,180 3,236,934    
Liabilities [Abstract]        
Other liabilities 5,469 6,378    
Other borrowings – Trust preferred debt 7,217 0    
Subordinated debentures 144,640 0    
Total liabilities 157,326 6,378    
Shareholders' equity: [Abstract]        
Common stock 4 4    
Capital surplus 1,006,535 982,009    
Retained earnings 2,823,334 2,704,121    
Treasury stock (544,052) (477,165)    
Accumulated other comprehensive income (loss) (10,967) 21,587    
Total shareholders’ equity 3,274,854 3,230,556    
Total liabilities and shareholders’ equity $ 3,432,180 $ 3,236,934