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Loans and Allowance for Credit Losses Present Loans, Net of Unearned Income and Their Related Allowance for Loan Losses, by Portfolio Segment (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Measured for impairment under FASB ASC Subtopic 450-20 $ 124,882   $ 113,250  
Evaluated for impairment under FASB ASC Section 310-10-35 45,194   50,591  
Allowance for loan losses 170,076 $ 168,679 163,841 $ 169,054
Measured for impairment under FASB ASC Subtopic 450-20 14,786,290   13,688,235  
Evaluated for impairment under FASB ASC Section 310-10-35 176,887   182,466  
Loans, net of unearned income 14,963,177 14,699,272 13,870,701  
Real-estate - commercial mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Measured for impairment under FASB ASC Subtopic 450-20 37,457   35,914  
Evaluated for impairment under FASB ASC Section 310-10-35 9,916   12,397  
Allowance for loan losses 47,373 46,842 48,311 47,866
Measured for impairment under FASB ASC Subtopic 450-20 6,067,492   5,499,820  
Evaluated for impairment under FASB ASC Section 310-10-35 51,041   58,288  
Loans, net of unearned income 6,118,533 6,018,582 5,558,108  
Commercial - industrial, financial and agricultural        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Measured for impairment under FASB ASC Subtopic 450-20 43,155   40,969  
Evaluated for impairment under FASB ASC Section 310-10-35 12,154   13,364  
Allowance for loan losses 55,309 54,353 54,333 57,098
Measured for impairment under FASB ASC Subtopic 450-20 4,119,550   3,992,567  
Evaluated for impairment under FASB ASC Section 310-10-35 48,259   42,766  
Loans, net of unearned income 4,167,809 4,087,486 4,035,333  
Real-estate - home equity        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Measured for impairment under FASB ASC Subtopic 450-20 14,744   13,541  
Evaluated for impairment under FASB ASC Section 310-10-35 9,077   8,983  
Allowance for loan losses 23,821 26,801 22,524 22,405
Measured for impairment under FASB ASC Subtopic 450-20 1,576,949   1,641,457  
Evaluated for impairment under FASB ASC Section 310-10-35 18,952   18,024  
Loans, net of unearned income 1,595,901 1,625,115 1,659,481  
Real-estate - residential mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Measured for impairment under FASB ASC Subtopic 450-20 10,581   7,599  
Evaluated for impairment under FASB ASC Section 310-10-35 11,437   12,329  
Allowance for loan losses 22,018 22,929 19,928 21,375
Measured for impairment under FASB ASC Subtopic 450-20 1,620,302   1,329,114  
Evaluated for impairment under FASB ASC Section 310-10-35 44,840   48,345  
Loans, net of unearned income 1,665,142 1,601,994 1,377,459  
Real-estate - construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Measured for impairment under FASB ASC Subtopic 450-20 4,915   4,004  
Evaluated for impairment under FASB ASC Section 310-10-35 2,586   2,278  
Allowance for loan losses 7,501 6,455 6,282 6,529
Measured for impairment under FASB ASC Subtopic 450-20 869,225   797,282  
Evaluated for impairment under FASB ASC Section 310-10-35 13,758   13,590  
Loans, net of unearned income 882,983 843,649 810,872  
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Measured for impairment under FASB ASC Subtopic 450-20 3,007   2,302  
Evaluated for impairment under FASB ASC Section 310-10-35 24   22  
Allowance for loan losses 3,031 3,574 2,324 2,585
Measured for impairment under FASB ASC Subtopic 450-20 288,789   263,189  
Evaluated for impairment under FASB ASC Section 310-10-35 37   32  
Loans, net of unearned income 288,826 291,470 263,221  
Leasing, other and overdrafts        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Measured for impairment under FASB ASC Subtopic 450-20 3,268   1,756  
Evaluated for impairment under FASB ASC Section 310-10-35 0   1,218  
Allowance for loan losses 3,268 3,192 2,974 2,468
Measured for impairment under FASB ASC Subtopic 450-20 243,983   164,806  
Evaluated for impairment under FASB ASC Section 310-10-35 0   1,421  
Loans, net of unearned income 243,983 230,976 166,227  
Unallocated        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Measured for impairment under FASB ASC Subtopic 450-20 7,755   7,165  
Allowance for loan losses $ 7,755 $ 4,533 $ 7,165 $ 8,728