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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, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 $ 153,968     $ 170,492    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 81,769     96,191    
Allowance for loan losses 235,737 256,496 256,471 266,683 270,272 274,271
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 11,697,429     11,522,121    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 285,404     330,370    
Loans, net of unearned income 11,982,833   11,968,970 11,852,491    
Real-estate commercial mortage [Member]
           
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 47,532     44,600    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 22,337     28,998    
Allowance for loan losses 69,869 81,652 85,112 73,598 48,558 40,831
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 4,541,364     4,329,750    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 111,733     113,275    
Loans, net of unearned income 4,653,097     4,443,025    
Commercial - industrial, financial, and agricultural
           
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 46,650     53,373    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 25,281     29,240    
Allowance for loan losses 71,931 79,756 74,896 82,613 100,180 101,436
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 3,471,260     3,587,702    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 66,928     91,156    
Loans, net of unearned income 3,538,188     3,678,858    
Real-estate - home equity [Member]
           
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 9,619     9,560    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 4,825     0    
Allowance for loan losses 14,444 13,083 12,841 9,560 5,656 6,454
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 1,591,117     1,626,545    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 8,351     0    
Loans, net of unearned income 1,599,468     1,626,545    
Real-estate - residential mortgage [Member]
           
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 7,781     5,953    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 18,930     25,959    
Allowance for loan losses 26,711 24,851 22,986 31,912 19,575 17,425
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 1,138,420     955,863    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 45,193     67,783    
Loans, net of unearned income 1,183,613     1,023,646    
Real-estate - construction
           
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 15,359     18,794    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 10,200     11,776    
Allowance for loan losses 25,559 31,186 30,066 30,570 55,491 58,117
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 566,163     623,734    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 52,897     57,854    
Loans, net of unearned income 619,060     681,588    
Consumer
           
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 1,811     1,597    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 5     158    
Allowance for loan losses 1,816 1,643 2,083 1,755 4,736 4,669
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 308,462     330,754    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 7     211    
Loans, net of unearned income 308,469     330,965    
Leasing and other and overdrafts [Member]
           
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 3,052     1,727    
Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 191     60    
Allowance for loan losses 3,243 3,274 2,397 1,787 2,576 3,840
Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 80,643     67,773    
Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 295     91    
Loans, net of unearned income 80,938     67,864    
Unallocated
           
Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 22,164 [1]     34,888 [1]    
Allowance for loan losses $ 22,164 [1] $ 21,051 $ 26,090 $ 34,888 [1] $ 33,500 $ 41,499
[1] The Corporation’s unallocated allowance, which was approximately 9% and 13% as of June 30, 2012 and June 30, 2011, respectively, was reasonable and appropriate as the estimates used in the allocation process are inherently imprecise.