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Loans and Leases (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]          
Noncovered loans pledged to secure debt obligations $ 8,470,000   $ 8,470,000   $ 8,580,000
Threshold period past due for write-off of Business credit card loans (days) 120 days        
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 6,000,000   6,000,000   6,080,000
Advances from Federal Home Loan Banks 660,200   660,200   510,300
Federal Home Loan Bank Advances, Current Borrowing Capacity 5,340,000   5,340,000   5,570,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums 10,800   10,800   16,600
Loans and Leases Receivable, Gross, Carrying Amount, Covered 95,500   95,500   272,600
Non-PCI Loans          
Financing Receivable, Recorded Investment [Line Items]          
Nonaccruing 89,006   89,006   95,854
Accretion Income 2,900 $ 4,900 6,100 $ 10,600  
PCI Loans          
Financing Receivable, Recorded Investment [Line Items]          
Nonaccruing 3,800   3,800   7,600
Accretion Income (20,400) $ (34,100)      
Bancorporation          
Financing Receivable, Recorded Investment [Line Items]          
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining 35,000   35,000   $ 41,100
United Western Bank [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loans and Leases Receivable, Gross, Carrying Amount, Covered 107,000   107,000    
Atlantic Bank & Trust [Member]          
Financing Receivable, Recorded Investment [Line Items]          
Loans and Leases Receivable, Gross, Carrying Amount, Covered $ 43,500   $ 43,500