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Loans and Allowance for Credit Losses Allowance for Loan Losses by Portfolio Segment (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Mar. 31, 2011
Loans and Leases Receivable, Allowance, Beginning Balance $ 274,271,000 $ 256,698,000    
Loans charged off (161,333,000) (151,425,000) (119,074,000)  
Loans Charged Off, Net Of Recoveries (152,321,000) (142,055,000) (112,604,000)  
Loans and Leases Receivable, Allowance, Ending Balance 256,471,000 274,271,000 256,698,000  
Percentage of Unallocated Allowance 10.00% 15.00%    
Change in provision allocated to commitments to lend to borrowers 479,000      
Provision for Loan and Lease Losses 135,000,000 160,000,000 190,020,000  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment       164,200,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment       106,000,000
Loans, net of unearned income 11,968,970,000 11,933,307,000    
Real-estate commercial mortage
        
Loans and Leases Receivable, Allowance, Beginning Balance 40,831,000      
Loans charged off (26,032,000)      
Recoveries of loans previously charged off 1,967,000      
Loans Charged Off, Net Of Recoveries (24,065,000)      
Provision for loan losses 45,463,000 [1]      
Impact of change in allowance methodology 22,883,000      
Provision for loan losses, including impact of change in allowance methodology 68,346,000 [1]      
Loans and Leases Receivable, Allowance, Ending Balance 85,112,000      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 4,476,262,000 4,217,660,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 126,334,000 158,320,000    
Loans, net of unearned income 4,602,596,000 4,375,980,000    
Real-estate commercial mortage | Allowance for Loan and Lease Losses [Member]
        
Loans and Leases Receivable, Allowance, Ending Balance 85,112,000 40,831,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 49,052,000 22,836,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 36,060,000 17,995,000    
Commercial - industrial, financial, and agricultural
        
Loans and Leases Receivable, Allowance, Beginning Balance 101,436,000      
Loans charged off (52,301,000)      
Recoveries of loans previously charged off 2,521,000      
Loans Charged Off, Net Of Recoveries (49,780,000)      
Provision for loan losses 36,628,000 [1]      
Impact of change in allowance methodology (13,388,000)      
Provision for loan losses, including impact of change in allowance methodology 23,240,000 [1]      
Loans and Leases Receivable, Allowance, Ending Balance 74,896,000      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 3,560,487,000 3,469,775,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 78,881,000 234,609,000    
Loans, net of unearned income 3,639,368,000 3,704,384,000    
Commercial - industrial, financial, and agricultural | Allowance for Loan and Lease Losses [Member]
        
Loans and Leases Receivable, Allowance, Ending Balance 74,896,000 101,436,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 46,471,000 32,323,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 28,425,000 69,113,000    
Real-estate - home equity
        
Loans and Leases Receivable, Allowance, Beginning Balance 6,454,000      
Loans charged off (6,397,000)      
Recoveries of loans previously charged off 63,000      
Loans Charged Off, Net Of Recoveries (6,334,000)      
Provision for loan losses 9,031,000 [1]      
Impact of change in allowance methodology 3,690,000      
Provision for loan losses, including impact of change in allowance methodology 12,721,000 [1]      
Loans and Leases Receivable, Allowance, Ending Balance 12,841,000      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 1,619,069,000 1,641,777,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 5,493,000 0    
Loans, net of unearned income 1,624,562,000 1,641,777,000    
Real-estate - home equity | Allowance for Loan and Lease Losses [Member]
        
Loans and Leases Receivable, Allowance, Ending Balance 12,841,000 6,454,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 9,765,000 6,454,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 3,076,000 0    
Real-estate - residential mortgage
        
Loans and Leases Receivable, Allowance, Beginning Balance 17,425,000      
Loans charged off (32,533,000)      
Recoveries of loans previously charged off 325,000      
Loans Charged Off, Net Of Recoveries (32,208,000)      
Provision for loan losses 29,873,000 [1]      
Impact of change in allowance methodology 7,896,000      
Provision for loan losses, including impact of change in allowance methodology 37,769,000 [1]      
Loans and Leases Receivable, Allowance, Ending Balance 22,986,000      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 1,057,274,000 956,260,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 39,918,000 39,730,000    
Loans, net of unearned income 1,097,192,000 995,990,000    
Real-estate - residential mortgage | Allowance for Loan and Lease Losses [Member]
        
Loans and Leases Receivable, Allowance, Ending Balance 22,986,000 17,425,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 6,691,000 11,475,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 16,295,000 5,950,000    
Real-estate - construction
        
Loans and Leases Receivable, Allowance, Beginning Balance 58,117,000      
Loans charged off (38,613,000)      
Recoveries of loans previously charged off 1,746,000      
Loans Charged Off, Net Of Recoveries (36,867,000)      
Provision for loan losses 33,587,000 [1]      
Impact of change in allowance methodology (24,771,000)      
Provision for loan losses, including impact of change in allowance methodology 8,816,000 [1]      
Loans and Leases Receivable, Allowance, Ending Balance 30,066,000      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 553,106,000 660,238,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 62,339,000 140,947,000    
Loans, net of unearned income 615,445,000 801,185,000    
Real-estate - construction | Allowance for Loan and Lease Losses [Member]
        
Loans and Leases Receivable, Allowance, Ending Balance 30,066,000 58,117,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 17,610,000 35,247,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 12,456,000 22,870,000    
Consumer
        
Loans and Leases Receivable, Allowance, Beginning Balance 4,669,000      
Loans charged off (3,289,000)      
Recoveries of loans previously charged off 1,368,000      
Loans Charged Off, Net Of Recoveries (1,921,000)      
Provision for loan losses 2,411,000 [1]      
Impact of change in allowance methodology (3,076,000)      
Provision for loan losses, including impact of change in allowance methodology (665,000) [1]      
Loans and Leases Receivable, Allowance, Ending Balance 2,083,000      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 317,733,000 350,161,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 368,000 0    
Loans, net of unearned income 318,101,000 350,161,000    
Consumer | Allowance for Loan and Lease Losses [Member]
        
Loans and Leases Receivable, Allowance, Ending Balance 2,083,000 4,669,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 1,855,000 4,669,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 228,000 0    
Leasing and Other and Overdrafts [Member]
        
Loans and Leases Receivable, Allowance, Beginning Balance 3,840,000      
Loans charged off (2,168,000)      
Recoveries of loans previously charged off 1,022,000      
Loans Charged Off, Net Of Recoveries (1,146,000)      
Provision for loan losses 647,000 [1]      
Impact of change in allowance methodology (944,000)      
Provision for loan losses, including impact of change in allowance methodology (297,000) [1]      
Loans and Leases Receivable, Allowance, Ending Balance 2,397,000      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 71,650,000 63,830,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 56,000 0    
Loans, net of unearned income 71,706,000 63,830,000    
Leasing and Other and Overdrafts [Member] | Allowance for Loan and Lease Losses [Member]
        
Loans and Leases Receivable, Allowance, Ending Balance 2,397,000 3,840,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 2,360,000 3,840,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 37,000 0    
Unallocated
        
Loans and Leases Receivable, Allowance, Beginning Balance 41,499,000 [2]      
Loans charged off 0 [2]      
Recoveries of loans previously charged off 0 [2]      
Loans Charged Off, Net Of Recoveries 0 [2]      
Provision for loan losses (23,119,000) [1],[2]      
Impact of change in allowance methodology 7,710,000 [2]      
Provision for loan losses, including impact of change in allowance methodology (15,409,000) [1],[2]      
Loans and Leases Receivable, Allowance, Ending Balance 26,090,000 [2]      
Unallocated | Allowance for Loan and Lease Losses [Member]
        
Loans and Leases Receivable, Allowance, Ending Balance 26,090,000 [2] 41,499,000 [2]    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 26,090,000 [2] 41,499,000 [2]    
Subtotal [Member]
        
Loans and Leases Receivable, Allowance, Beginning Balance 274,271,000      
Loans charged off (161,333,000)      
Recoveries of loans previously charged off 9,012,000      
Loans Charged Off, Net Of Recoveries (152,321,000)      
Provision for loan losses 134,521,000 [1]      
Impact of change in allowance methodology 0      
Provision for loan losses, including impact of change in allowance methodology 134,521,000 [1]      
Loans and Leases Receivable, Allowance, Ending Balance 256,471,000      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 11,655,581,000 11,359,701,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 313,389,000 573,606,000    
Loans, net of unearned income 11,968,970,000 11,933,307,000    
Subtotal [Member] | Allowance for Loan and Lease Losses [Member]
        
Loans and Leases Receivable, Allowance, Ending Balance 256,471,000 274,271,000    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 159,894,000 158,343,000    
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment $ 96,577,000 $ 115,928,000    
[1] Provision for loan losses is net of a $479,000 decrease in provision applied to unfunded commitments for the year ended December 31, 2011. The total provision for credit losses, comprised of allocations for both funded and unfunded loans, was $135.0 million for the year ended December 31, 2011.
[2] The Corporation’s unallocated allowance, which was approximately 10% and 15% as of December 31, 2011 and December 31, 2010, respectively, was reasonable and appropriate as the estimates used in the allocation process are inherently imprecise.