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Loans, Allowance for Loan and Lease Losses, and Reserve for Off-Balance Sheet Credit Commitments (Details 6) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans $ 11,663,123,000 $ 11,483,044,000 $ 11,663,123,000 $ 11,483,044,000 $ 11,386,628,000
Covered Loans Allowance          
Balance, beginning of period 82,016,000   67,389,000    
Provision for losses 1,716,000 46,516,000 20,832,000 46,516,000  
Reduction in allowance due to loan removals (16,103,000) (261,000) (20,592,000) (261,000)  
Balance, end of period 67,629,000 46,255,000 67,629,000 46,255,000  
Acquired covered loans nonaccrual status 1,400,000   1,400,000   2,600,000
Covered loans 30 to 89 days delinquent 47,300,000 56,300,000 47,300,000 56,300,000 99,500,000
Covered loans 90 days or more past due on accrual status 368,400,000 362,700,000 368,400,000 362,700,000 399,000,000
Commercial | Nonclassified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 4,308,312,000 3,731,182,000 4,308,312,000 3,731,182,000 4,009,923,000
Commercial real estate mortgages | Nonclassified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 1,716,331,000 1,856,382,000 1,716,331,000 1,856,382,000 1,727,353,000
Residential mortgage | Nonclassified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 3,671,840,000 3,500,888,000 3,671,840,000 3,500,888,000 3,496,540,000
Real estate construction | Nonclassified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 175,798,000 284,953,000 175,798,000 284,953,000 183,071,000
Equity lines of credit | Nonclassified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 717,536,000 725,133,000 717,536,000 725,133,000 716,276,000
Installment loan | Nonclassified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 128,217,000 163,580,000 128,217,000 163,580,000 148,254,000
Lease financing | Nonclassified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 374,784,000 342,609,000 374,784,000 342,609,000 371,684,000
Fixed | Nonclassified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 1,651,983,000 1,644,380,000 1,651,983,000 1,644,380,000 1,615,970,000
Variable | Nonclassified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 2,019,857,000 1,856,508,000 2,019,857,000 1,856,508,000 1,880,570,000
Construction | Nonclassified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 128,584,000 213,061,000 128,584,000 213,061,000 129,671,000
Land | Nonclassified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 47,214,000 71,892,000 47,214,000 71,892,000 53,400,000
Commercial Installment loan | Nonclassified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 656,000 38,057,000 656,000 38,057,000 21,349,000
Consumer Installment loan | Nonclassified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 127,561,000 125,523,000 127,561,000 125,523,000 126,905,000
Nonclassified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 11,092,818,000 10,604,727,000 11,092,818,000 10,604,727,000 10,653,101,000
Commercial | Classified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 112,587,000 204,362,000 112,587,000 204,362,000 126,951,000
Commercial real estate mortgages | Classified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 213,938,000 221,621,000 213,938,000 221,621,000 230,964,000
Residential mortgage | Classified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 38,925,000 77,006,000 38,925,000 77,006,000 55,772,000
Real estate construction | Classified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 179,216,000 344,949,000 179,216,000 344,949,000 284,714,000
Equity lines of credit | Classified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 18,363,000 16,938,000 18,363,000 16,938,000 17,465,000
Installment loan | Classified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 2,707,000 5,490,000 2,707,000 5,490,000 11,890,000
Lease financing | Classified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 4,569,000 7,951,000 4,569,000 7,951,000 5,771,000
Fixed | Classified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 24,086,000 29,247,000 24,086,000 29,247,000 27,076,000
Variable | Classified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 14,839,000 47,759,000 14,839,000 47,759,000 28,696,000
Construction | Classified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 108,696,000 242,749,000 108,696,000 242,749,000 196,847,000
Land | Classified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 70,520,000 102,200,000 70,520,000 102,200,000 87,867,000
Commercial Installment loan | Classified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 830,000 2,548,000 830,000 2,548,000 9,812,000
Consumer Installment loan | Classified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 1,877,000 2,942,000 1,877,000 2,942,000 2,078,000
Classified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 570,305,000 878,317,000 570,305,000 878,317,000 733,527,000
Commercial
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 4,420,899,000 3,935,544,000 4,420,899,000 3,935,544,000 4,136,874,000
Commercial real estate mortgages
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 1,930,269,000 2,078,003,000 1,930,269,000 2,078,003,000 1,958,317,000
Residential mortgage
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 3,710,765,000 3,577,894,000 3,710,765,000 3,577,894,000 3,552,312,000
Fixed
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 1,676,069,000 1,673,627,000 1,676,069,000 1,673,627,000 1,643,046,000
Variable
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 2,034,696,000 1,904,267,000 2,034,696,000 1,904,267,000 1,909,266,000
Real estate construction
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 355,014,000 629,902,000 355,014,000 629,902,000 467,785,000
Construction
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 237,280,000 455,810,000 237,280,000 455,810,000 326,518,000
Land
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 117,734,000 174,092,000 117,734,000 174,092,000 141,267,000
Equity lines of credit
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 735,899,000 742,071,000 735,899,000 742,071,000 733,741,000
Installment loan
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 130,924,000 169,070,000 130,924,000 169,070,000 160,144,000
Commercial Installment loan
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 1,486,000 40,605,000 1,486,000 40,605,000 31,161,000
Consumer Installment loan
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 129,438,000 128,465,000 129,438,000 128,465,000 128,983,000
Lease financing
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans $ 379,353,000 $ 350,560,000 $ 379,353,000 $ 350,560,000 $ 377,455,000