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Loans and Allowance for Credit Losses Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 15,795,918 $ 14,718,662
Commercial – industrial, financial and agricultural    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 4,300,297 4,087,486
Real estate – commercial mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 6,364,804 6,018,582
Commercial - secured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 4,132,440 3,933,552
Commercial - unsecured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 167,857 153,934
Construction - commercial residential    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 163,102 142,189
Construction - commercial    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 765,816 644,490
Total real estate - construction (excluding construction - other)    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 928,918 786,679
Commercial Loans, Commerical Mortgages, Constructions Loans    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 11,594,019 $ 10,892,747
% of Total 100.00% 100.00%
Pass | Commercial – industrial, financial and agricultural    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 3,991,105 $ 3,832,074
Pass | Real estate – commercial mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 6,066,396 5,763,122
Pass | Commercial - secured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 3,831,485 3,686,152
Pass | Commercial - unsecured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 159,620 145,922
Pass | Construction - commercial residential    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 143,759 113,570
Pass | Construction - commercial    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 761,218 635,963
Pass | Total real estate - construction (excluding construction - other)    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 904,977 749,533
Pass | Commercial Loans, Commerical Mortgages, Constructions Loans    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 10,962,478 $ 10,344,729
% of Total 94.60% 95.00%
Special Mention | Commercial – industrial, financial and agricultural    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 127,320 $ 133,354
Special Mention | Real estate – commercial mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 147,604 132,484
Special Mention | Commercial - secured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 121,842 128,873
Special Mention | Commercial - unsecured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 5,478 4,481
Special Mention | Construction - commercial residential    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 5,259 15,447
Special Mention | Construction - commercial    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 846 3,412
Special Mention | Total real estate - construction (excluding construction - other)    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 6,105 18,859
Special Mention | Commercial Loans, Commerical Mortgages, Constructions Loans    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 281,029 $ 284,697
% of Total 2.40% 2.60%
Substandard or Lower | Commercial – industrial, financial and agricultural    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 181,872 $ 122,058
Substandard or Lower | Real estate – commercial mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 150,804 122,976
Substandard or Lower | Commercial - secured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 179,113 118,527
Substandard or Lower | Commercial - unsecured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 2,759 3,531
Substandard or Lower | Construction - commercial residential    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 14,084 13,172
Substandard or Lower | Construction - commercial    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 3,752 5,115
Substandard or Lower | Total real estate - construction (excluding construction - other)    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 17,836 18,287
Substandard or Lower | Commercial Loans, Commerical Mortgages, Constructions Loans    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 350,512 $ 263,321
% of Total 3.00% 2.40%