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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, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 $ 120,264     $ 118,143    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 42,262     48,993    
Allowance for loan losses 162,526 $ 162,546 $ 169,054 167,136 $ 167,485 $ 184,144
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 14,208,244     13,341,850    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 182,994     194,511    
Loans, net of unearned income 14,391,238   13,838,602 13,536,361    
Real-estate commercial mortage [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 36,151     38,490    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 9,706     13,197    
Allowance for loan losses 45,857 43,740 47,866 51,687 50,680 53,493
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 5,763,863     5,273,819    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 55,052     66,109    
Loans, net of unearned income 5,818,915   5,462,330 5,339,928    
Commercial - industrial, financial, and agricultural [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 38,858     36,002    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 9,421     12,721    
Allowance for loan losses 48,279 51,755 57,098 48,723 49,170 51,378
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 3,972,461     3,885,956    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 51,658     43,952    
Loans, net of unearned income 4,024,119   4,088,962 3,929,908    
Home Equity [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 17,828     14,867    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 9,293     7,183    
Allowance for loan losses 27,121 26,170 22,405 22,050 22,506 28,271
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 1,621,731     1,679,471    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 18,690     14,178    
Loans, net of unearned income 1,640,421   1,684,439 1,693,649    
Real-estate - residential mortgage [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 10,410     7,921    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 11,694     13,423    
Allowance for loan losses 22,104 21,226 21,375 21,344 22,787 29,072
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 1,496,461     1,330,778    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 46,235     51,307    
Loans, net of unearned income 1,542,696   1,376,160 1,382,085    
Real-estate - construction [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 4,422     5,119    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 2,121     2,450    
Allowance for loan losses 6,543 5,772 6,529 7,569 7,749 9,756
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 850,315     750,629    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 11,319     18,936    
Loans, net of unearned income 861,634   799,988 769,565    
Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 3,346     2,535    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 27     19    
Allowance for loan losses 3,373 2,984 2,585 2,554 2,608 3,015
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 283,633     271,667    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 40     29    
Loans, net of unearned income 283,673   268,588 271,696    
Leasing and other and overdrafts [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 2,929     1,662    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 0     0    
Allowance for loan losses 2,929 2,518 2,468 1,662 1,615 1,799
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 219,780     149,530    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 0     0    
Loans, net of unearned income 219,780   158,135 149,530    
Unallocated [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 6,320     11,547    
Allowance for loan losses $ 6,320 $ 8,381 $ 8,728 $ 11,547 $ 10,370 $ 7,360