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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
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 $ 129,264     $ 117,813    
Evaluated for impairment under FASB ASC Section 310-10-35 43,078     44,733    
Allowance for loan losses 172,342 $ 170,076 $ 168,679 162,546 $ 163,841 $ 169,054
Measured for impairment under FASB ASC Subtopic 450-20 15,159,282     13,982,252    
Evaluated for impairment under FASB ASC Section 310-10-35 187,335     172,907    
Loans, net of unearned income 15,346,617   14,699,272 14,155,159    
Real-estate - commercial mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 49,055     32,861    
Evaluated for impairment under FASB ASC Section 310-10-35 8,317     10,879    
Allowance for loan losses 57,372 47,373 46,842 43,740 48,311 47,866
Measured for impairment under FASB ASC Subtopic 450-20 6,212,998     5,582,027    
Evaluated for impairment under FASB ASC Section 310-10-35 49,010     53,320    
Loans, net of unearned income 6,262,008   6,018,582 5,635,347    
Commercial - industrial, financial and agricultural            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 57,341     40,945    
Evaluated for impairment under FASB ASC Section 310-10-35 10,301     10,810    
Allowance for loan losses 67,642 55,309 54,353 51,755 54,333 57,098
Measured for impairment under FASB ASC Subtopic 450-20 4,189,676     4,057,883    
Evaluated for impairment under FASB ASC Section 310-10-35 56,173     41,294    
Loans, net of unearned income 4,245,849   4,087,486 4,099,177    
Real-estate - home equity            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 7,607     17,089    
Evaluated for impairment under FASB ASC Section 310-10-35 9,849     9,081    
Allowance for loan losses 17,456 23,821 26,801 26,170 22,524 22,405
Measured for impairment under FASB ASC Subtopic 450-20 1,557,989     1,629,443    
Evaluated for impairment under FASB ASC Section 310-10-35 21,750     17,876    
Loans, net of unearned income 1,579,739   1,625,115 1,647,319    
Real estate - residential mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 6,013     9,044    
Evaluated for impairment under FASB ASC Section 310-10-35 10,426     12,182    
Allowance for loan losses 16,439 22,018 22,929 21,226 19,928 21,375
Measured for impairment under FASB ASC Subtopic 450-20 1,741,404     1,399,399    
Evaluated for impairment under FASB ASC Section 310-10-35 43,308     47,893    
Loans, net of unearned income 1,784,712   1,601,994 1,447,292    
Real-estate - construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 5,370     4,004    
Evaluated for impairment under FASB ASC Section 310-10-35 4,164     1,768    
Allowance for loan losses 9,534 7,501 6,455 5,772 6,282 6,529
Measured for impairment under FASB ASC Subtopic 450-20 921,839     841,193    
Evaluated for impairment under FASB ASC Section 310-10-35 17,061     12,506    
Loans, net of unearned income 938,900   843,649 853,699    
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 1,773     2,971    
Evaluated for impairment under FASB ASC Section 310-10-35 21     13    
Allowance for loan losses 1,794 3,031 3,574 2,984 2,324 2,585
Measured for impairment under FASB ASC Subtopic 450-20 283,123     278,053    
Evaluated for impairment under FASB ASC Section 310-10-35 33     18    
Loans, net of unearned income 283,156   291,470 278,071    
Leasing, other and overdrafts            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 2,105     2,518    
Evaluated for impairment under FASB ASC Section 310-10-35 0     0    
Allowance for loan losses 2,105 3,268 3,192 2,518 2,974 2,468
Measured for impairment under FASB ASC Subtopic 450-20 252,253     194,254    
Evaluated for impairment under FASB ASC Section 310-10-35 0     0    
Loans, net of unearned income 252,253   230,976 194,254    
Unallocated            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 0     8,381    
Allowance for loan losses $ 0 $ 7,755 $ 4,533 $ 8,381 $ 7,165 $ 8,728