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Loans, Allowance for Loan and Lease Losses, and Reserve for Off-Balance Sheet Credit Commitments (Details 8) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans $ 13,724,651,000 $ 12,164,209,000 $ 13,724,651,000 $ 12,164,209,000 $ 12,309,385,000
Covered Loans Allowance          
Balance, beginning of period 43,147,000 67,629,000 64,565,000 67,389,000  
Provision for losses 18,089,000 5,147,000 38,848,000 25,979,000  
Charge-offs   (325,000)   (325,000)  
Reduction in allowance due to loan removals (16,258,000) (10,698,000) (58,435,000) (31,290,000)  
Balance, end of period 44,978,000 61,753,000 44,978,000 61,753,000  
Acquired covered loans on nonaccrual status         400,000
Covered loans 30 to 89 days delinquent 15,600,000   15,600,000   49,100,000
Covered loans 90 days or more past due on accrual status 140,000,000   140,000,000   330,200,000
Commercial
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 5,554,521,000   5,554,521,000   4,846,594,000
Commercial real estate mortgages
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 2,463,664,000 2,059,114,000 2,463,664,000 2,059,114,000 2,110,749,000
Residential mortgage
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 3,897,690,000 3,742,768,000 3,897,690,000 3,742,768,000 3,763,218,000
Fixed
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 1,488,793,000   1,488,793,000   1,581,796,000
Variable
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 2,408,897,000   2,408,897,000   2,181,422,000
Real estate construction
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 242,137,000 335,712,000 242,137,000 335,712,000 315,609,000
Construction
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 166,237,000   166,237,000   217,861,000
Land
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 75,900,000   75,900,000   97,748,000
Equity lines of credit
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 718,966,000 728,890,000 718,966,000 728,890,000 741,081,000
Installment loan
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 137,632,000 130,923,000 137,632,000 130,923,000 132,647,000
Commercial Installment loan
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 452,000   452,000   605,000
Consumer Installment loan
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 137,180,000   137,180,000   132,042,000
Lease financing
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 710,041,000   710,041,000   399,487,000
Nonclassified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 13,302,610,000   13,302,610,000   11,834,998,000
Nonclassified | Commercial
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 5,413,587,000   5,413,587,000   4,732,663,000
Nonclassified | Commercial real estate mortgages
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 2,330,210,000   2,330,210,000   1,930,001,000
Nonclassified | Residential mortgage
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 3,863,728,000   3,863,728,000   3,728,878,000
Nonclassified | Fixed
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 1,472,865,000   1,472,865,000   1,565,420,000
Nonclassified | Variable
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 2,390,863,000   2,390,863,000   2,163,458,000
Nonclassified | Real estate construction
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 155,126,000   155,126,000   191,633,000
Nonclassified | Construction
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 110,208,000   110,208,000   147,916,000
Nonclassified | Land
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 44,918,000   44,918,000   43,717,000
Nonclassified | Equity lines of credit
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 698,997,000   698,997,000   724,045,000
Nonclassified | Installment loan
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 136,922,000   136,922,000   131,522,000
Nonclassified | Commercial Installment loan
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 452,000   452,000   601,000
Nonclassified | Consumer Installment loan
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 136,470,000   136,470,000   130,921,000
Nonclassified | Lease financing
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 704,040,000   704,040,000   396,256,000
Classified
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 422,041,000   422,041,000   474,387,000
Classified | Commercial
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 140,934,000   140,934,000   113,931,000
Classified | Commercial real estate mortgages
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 133,454,000   133,454,000   180,748,000
Classified | Residential mortgage
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 33,962,000   33,962,000   34,340,000
Classified | Fixed
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 15,928,000   15,928,000   16,376,000
Classified | Variable
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 18,034,000   18,034,000   17,964,000
Classified | Real estate construction
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 87,011,000   87,011,000   123,976,000
Classified | Construction
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 56,029,000   56,029,000   69,945,000
Classified | Land
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 30,982,000   30,982,000   54,031,000
Classified | Equity lines of credit
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 19,969,000   19,969,000   17,036,000
Classified | Installment loan
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 710,000   710,000   1,125,000
Classified | Commercial Installment loan
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans         4,000
Classified | Consumer Installment loan
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans 710,000   710,000   1,121,000
Classified | Lease financing
          
Financing Receivable, Recorded Investment          
Loans and leases, excluding covered loans $ 6,001,000   $ 6,001,000   $ 3,231,000