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Loans and Allowance for Loan Losses - Impaired loans by loan class (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment $ 221,928   $ 395,192
Individually evaluated impaired loans with no recorded allowance, unpaid principle balance 239,393   416,471
Individually evaluated impaired loans with a recorded allowance, recorded investment 572,159   557,914
Individually evaluated impaired loans with a recorded allowance, unpaid principle balance 614,550   587,043
Individually evaluated impaired loans with a recorded allowance, allowance 137,351   138,208
Individually evaluated impaired loans, average recorded investment 831,383 $ 593,071  
Individually evaluated impaired loans, interest income recognized 1,918 2,035  
Commercial, Financial and Agricultural      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment 200,288   375,957
Individually evaluated impaired loans with no recorded allowance, unpaid principle balance 216,689   396,294
Individually evaluated impaired loans with a recorded allowance, recorded investment 353,688   343,511
Individually evaluated impaired loans with a recorded allowance, unpaid principle balance 394,842   371,085
Individually evaluated impaired loans with a recorded allowance, allowance 96,429   99,932
Individually evaluated impaired loans, average recorded investment 598,126 343,028  
Individually evaluated impaired loans, interest income recognized 404 320  
Commercial Real Estate | Real estate – construction      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment 0   0
Individually evaluated impaired loans with no recorded allowance, unpaid principle balance 0   0
Individually evaluated impaired loans with a recorded allowance, recorded investment 328   344
Individually evaluated impaired loans with a recorded allowance, unpaid principle balance 371   459
Individually evaluated impaired loans with a recorded allowance, allowance 234   344
Individually evaluated impaired loans, average recorded investment 334 3,999  
Individually evaluated impaired loans, interest income recognized 2 2  
Commercial Real Estate | Commercial real estate – mortgage      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment 21,640   19,235
Individually evaluated impaired loans with no recorded allowance, unpaid principle balance 22,704   20,177
Individually evaluated impaired loans with a recorded allowance, recorded investment 39,204   24,679
Individually evaluated impaired loans with a recorded allowance, unpaid principle balance 39,504   24,865
Individually evaluated impaired loans with a recorded allowance, allowance 6,991   3,693
Individually evaluated impaired loans, average recorded investment 49,265 60,504  
Individually evaluated impaired loans, interest income recognized 284 413  
Residential Real Estate | Residential real estate – mortgage      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment 0   0
Individually evaluated impaired loans with no recorded allowance, unpaid principle balance 0   0
Individually evaluated impaired loans with a recorded allowance, recorded investment 113,680   119,986
Individually evaluated impaired loans with a recorded allowance, unpaid principle balance 113,680   119,986
Individually evaluated impaired loans with a recorded allowance, allowance 9,759   7,529
Individually evaluated impaired loans, average recorded investment 116,979 108,918  
Individually evaluated impaired loans, interest income recognized 646 636  
Residential Real Estate | Equity lines of credit      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment 0   0
Individually evaluated impaired loans with no recorded allowance, unpaid principle balance 0   0
Individually evaluated impaired loans with a recorded allowance, recorded investment 22,912   24,591
Individually evaluated impaired loans with a recorded allowance, unpaid principle balance 23,037   25,045
Individually evaluated impaired loans with a recorded allowance, allowance 16,945   19,083
Individually evaluated impaired loans, average recorded investment 23,338 27,912  
Individually evaluated impaired loans, interest income recognized 229 281  
Residential Real Estate | Equity loans      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment 0   0
Individually evaluated impaired loans with no recorded allowance, unpaid principle balance 0   0
Individually evaluated impaired loans with a recorded allowance, recorded investment 39,677   41,761
Individually evaluated impaired loans with a recorded allowance, unpaid principle balance 40,446   42,561
Individually evaluated impaired loans with a recorded allowance, allowance 5,042   5,404
Individually evaluated impaired loans, average recorded investment 40,570 45,947  
Individually evaluated impaired loans, interest income recognized 344 373  
Consumer | Credit card      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment 0   0
Individually evaluated impaired loans with no recorded allowance, unpaid principle balance 0   0
Individually evaluated impaired loans with a recorded allowance, recorded investment 0   0
Individually evaluated impaired loans with a recorded allowance, unpaid principle balance 0   0
Individually evaluated impaired loans with a recorded allowance, allowance 0   0
Individually evaluated impaired loans, average recorded investment 0 0  
Individually evaluated impaired loans, interest income recognized 0 0  
Consumer | Consumer direct      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment 0   0
Individually evaluated impaired loans with no recorded allowance, unpaid principle balance 0   0
Individually evaluated impaired loans with a recorded allowance, recorded investment 691   745
Individually evaluated impaired loans with a recorded allowance, unpaid principle balance 691   745
Individually evaluated impaired loans with a recorded allowance, allowance 49   59
Individually evaluated impaired loans, average recorded investment 707 904  
Individually evaluated impaired loans, interest income recognized 6 8  
Consumer | Consumer indirect      
Financing Receivable, Impaired [Line Items]      
Individually evaluated impaired loans with no recorded allowance, recorded investment 0   0
Individually evaluated impaired loans with no recorded allowance, unpaid principle balance 0   0
Individually evaluated impaired loans with a recorded allowance, recorded investment 1,979   2,297
Individually evaluated impaired loans with a recorded allowance, unpaid principle balance 1,979   2,297
Individually evaluated impaired loans with a recorded allowance, allowance 1,902   $ 2,164
Individually evaluated impaired loans, average recorded investment 2,064 1,859  
Individually evaluated impaired loans, interest income recognized $ 3 $ 2