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Loans and Allowance for Loan Losses - Allowance for loan losses by portfolio (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Ending Balance of Allowance Attributable to Loans [Abstract]        
Individually evaluated for impairment $ 71,217 $ 63,433    
Collectively evaluated for impairment 689,847 617,259    
Purchased nonimpaired, covered 100 742    
Purchased nonimpaired, total loans 269 2,283    
Total allowance for loan losses, covered 1,440 2,808 $ 2,954 $ 17,803
Total allowance for loan losses, total loans 762,673 685,041 $ 700,719 $ 802,853
Ending Balance of Loans [Abstract]        
Individually evaluated for impairment 429,586 351,070    
Collectively evaluated for impairment 60,374,619 56,453,902    
Purchased nonimpaired, covered 117,869 133,618    
Purchased nonimpaired, total loans 196,787 205,240    
Total loans, covered 440,961 495,190    
Total loans 61,324,084 57,371,784    
Receivables acquired with deteriorated credit quality        
Ending Balance of Allowance Attributable to Loans [Abstract]        
Purchased impaired 1,340 2,066    
Ending Balance of Loans [Abstract]        
Purchased impaired 323,092 361,572    
Commercial, Financial and Agricultural        
Ending Balance of Allowance Attributable to Loans [Abstract]        
Individually evaluated for impairment 27,486 11,158    
Collectively evaluated for impairment 374,458 287,105    
Purchased nonimpaired 169 1,219    
Total allowance for loan losses 402,113 299,482    
Ending Balance of Loans [Abstract]        
Individually evaluated for impairment 163,201 48,173    
Collectively evaluated for impairment 25,828,286 23,745,149    
Purchased nonimpaired 30,887 35,215    
Total loans, excluding covered loans 26,022,374 23,828,537    
Commercial real estate        
Ending Balance of Allowance Attributable to Loans [Abstract]        
Individually evaluated for impairment [1] 3,725 8,466    
Collectively evaluated for impairment [1] 118,343 129,767    
Total allowance for loan losses [1] 122,068 138,233    
Ending Balance of Loans [Abstract]        
Individually evaluated for impairment [1] 80,123 105,608    
Collectively evaluated for impairment [1] 12,685,320 11,896,943    
Purchased nonimpaired [1] 42,090 29,307    
Total loans, excluding covered loans [1] 12,807,533 12,031,858    
Residential real estate        
Ending Balance of Allowance Attributable to Loans [Abstract]        
Individually evaluated for impairment [2] 38,126 42,277    
Collectively evaluated for impairment [2] 93,978 112,350    
Total allowance for loan losses [2] 132,104 154,627    
Ending Balance of Loans [Abstract]        
Individually evaluated for impairment [2] 183,473 195,462    
Collectively evaluated for impairment [2] 16,809,525 16,665,930    
Purchased nonimpaired [2] 906 1,016    
Total loans, excluding covered loans [2] 16,993,904 16,862,408    
Consumer loans        
Ending Balance of Allowance Attributable to Loans [Abstract]        
Individually evaluated for impairment [3] 1,880 1,532    
Collectively evaluated for impairment [3] 103,068 88,037    
Purchased nonimpaired [3] 0 322    
Total allowance for loan losses [3] 104,948 89,891    
Ending Balance of Loans [Abstract]        
Individually evaluated for impairment [3] 2,789 1,827    
Collectively evaluated for impairment [3] 5,051,488 4,145,880    
Purchased nonimpaired [3] 5,035 6,084    
Total loans, excluding covered loans [3] $ 5,059,312 $ 4,153,791    
[1] Includes commercial real estate – mortgage and real estate – construction loans.
[2] Includes residential real estate – mortgage, equity lines of credit and equity loans.
[3] Includes credit card, consumer direct and consumer indirect loans.