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Loans and Allowance for Credit Losses Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 16,192,439 $ 15,795,918
Commercial – industrial, financial and agricultural    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 4,404,548 4,300,297
Real estate – commercial mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 6,434,285 6,364,804
Commercial - secured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 4,224,980 4,132,440
Commercial - unsecured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 179,568 167,857
Construction - commercial residential    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 117,872 163,102
Construction - commercial    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 726,726 765,816
Total construction (excluding construction - other)    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 844,598 928,918
Commercial Loans, Commerical Mortgages, Constructions Loans    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 11,683,431 $ 11,594,019
% of Total 100.00% 100.00%
Pass | Commercial – industrial, financial and agricultural    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 4,074,073 $ 3,991,105
Pass | Real estate – commercial mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 6,129,463 6,066,396
Pass | Commercial - secured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 3,902,484 3,831,485
Pass | Commercial - unsecured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 171,589 159,620
Pass | Construction - commercial residential    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 104,079 143,759
Pass | Construction - commercial    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 723,030 761,218
Pass | Total construction (excluding construction - other)    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 827,109 904,977
Pass | Commercial Loans, Commerical Mortgages, Constructions Loans    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 11,030,645 $ 10,962,478
% of Total 94.40% 94.60%
Special Mention | Commercial – industrial, financial and agricultural    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 197,486 $ 127,320
Special Mention | Real estate – commercial mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 170,827 147,604
Special Mention | Commercial - secured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 193,470 121,842
Special Mention | Commercial - unsecured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 4,016 5,478
Special Mention | Construction - commercial residential    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 6,912 5,259
Special Mention | Construction - commercial    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 1,163 846
Special Mention | Total construction (excluding construction - other)    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 8,075 6,105
Special Mention | Commercial Loans, Commerical Mortgages, Constructions Loans    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 376,388 $ 281,029
% of Total 3.20% 2.40%
Substandard or Lower | Commercial – industrial, financial and agricultural    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 132,989 $ 181,872
Substandard or Lower | Real estate – commercial mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 133,995 150,804
Substandard or Lower | Commercial - secured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 129,026 179,113
Substandard or Lower | Commercial - unsecured    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 3,963 2,759
Substandard or Lower | Construction - commercial residential    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 6,881 14,084
Substandard or Lower | Construction - commercial    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 2,533 3,752
Substandard or Lower | Total construction (excluding construction - other)    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount 9,414 17,836
Substandard or Lower | Commercial Loans, Commerical Mortgages, Constructions Loans    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Amount $ 276,398 $ 350,512
% of Total 2.40% 3.00%