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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
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 $ 126,544     $ 120,264    
Evaluated for impairment under FASB ASC Section 310-10-35 45,701     42,262    
Allowance for loan losses 172,245 $ 172,342 $ 168,679 162,526 $ 162,546 $ 169,054
Measured for impairment under FASB ASC Subtopic 450-20 15,300,419     14,208,244    
Evaluated for impairment under FASB ASC Section 310-10-35 186,480     182,994    
Loans, net of unearned income 15,486,899   14,699,272 14,391,238    
Real-estate - commercial mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 47,261     36,151    
Evaluated for impairment under FASB ASC Section 310-10-35 7,726     9,706    
Allowance for loan losses 54,987 57,372 46,842 45,857 43,740 47,866
Measured for impairment under FASB ASC Subtopic 450-20 6,228,935     5,763,863    
Evaluated for impairment under FASB ASC Section 310-10-35 46,205     55,052    
Loans, net of unearned income 6,275,140   6,018,582 5,818,915    
Commercial - industrial, financial and agricultural            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 55,486     38,858    
Evaluated for impairment under FASB ASC Section 310-10-35 15,499     9,421    
Allowance for loan losses 70,985 67,642 54,353 48,279 51,755 57,098
Measured for impairment under FASB ASC Subtopic 450-20 4,162,857     3,972,461    
Evaluated for impairment under FASB ASC Section 310-10-35 60,218     51,658    
Loans, net of unearned income 4,223,075   4,087,486 4,024,119    
Real-estate - home equity            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 7,632     17,828    
Evaluated for impairment under FASB ASC Section 310-10-35 10,826     9,293    
Allowance for loan losses 18,458 17,456 26,801 27,121 26,170 22,405
Measured for impairment under FASB ASC Subtopic 450-20 1,543,551     1,621,731    
Evaluated for impairment under FASB ASC Section 310-10-35 23,922     18,690    
Loans, net of unearned income 1,567,473   1,625,115 1,640,421    
Real estate - residential mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 6,488     10,410    
Evaluated for impairment under FASB ASC Section 310-10-35 10,195     11,694    
Allowance for loan losses 16,683 16,439 22,929 22,104 21,226 21,375
Measured for impairment under FASB ASC Subtopic 450-20 1,845,329     1,496,461    
Evaluated for impairment under FASB ASC Section 310-10-35 42,578     46,235    
Loans, net of unearned income 1,887,907   1,601,994 1,542,696    
Real-estate - construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 5,702     4,422    
Evaluated for impairment under FASB ASC Section 310-10-35 1,434     2,121    
Allowance for loan losses 7,136 9,534 6,455 6,543 5,772 6,529
Measured for impairment under FASB ASC Subtopic 450-20 959,584     850,315    
Evaluated for impairment under FASB ASC Section 310-10-35 13,524     11,319    
Loans, net of unearned income 973,108   843,649 861,634    
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 1,976     3,346    
Evaluated for impairment under FASB ASC Section 310-10-35 21     27    
Allowance for loan losses 1,997 1,794 3,574 3,373 2,984 2,585
Measured for impairment under FASB ASC Subtopic 450-20 302,415     283,633    
Evaluated for impairment under FASB ASC Section 310-10-35 33     40    
Loans, net of unearned income 302,448   291,470 283,673    
Leasing, other and overdrafts            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 1,999     2,929    
Evaluated for impairment under FASB ASC Section 310-10-35 0     0    
Allowance for loan losses 1,999 2,105 3,192 2,929 2,518 2,468
Measured for impairment under FASB ASC Subtopic 450-20 257,748     219,780    
Evaluated for impairment under FASB ASC Section 310-10-35 0     0    
Loans, net of unearned income 257,748   230,976 219,780    
Unallocated            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measured for impairment under FASB ASC Subtopic 450-20 0     6,320    
Allowance for loan losses $ 0 $ 0 $ 4,533 $ 6,320 $ 8,381 $ 8,728