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Loans and Leases (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]      
Noncovered loans pledged to secure debt obligations $ 8,510,000   $ 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 $ 6,080,000   6,080,000
Advances from Federal Home Loan Banks 585,300   510,300
Federal Home Loan Bank Advances, Current Borrowing Capacity 5,500,000   5,570,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums 13,200   16,600
Loans and Leases Receivable, Gross, Carrying Amount, Covered 258,200   272,600
Non-PCI Loans      
Financing Receivable, Recorded Investment [Line Items]      
Nonaccruing 90,455   95,854
Accretion Income 3,200 $ 5,600  
PCI Loans      
Financing Receivable, Recorded Investment [Line Items]      
Nonaccruing 7,300   7,600
Bancorporation      
Financing Receivable, Recorded Investment [Line Items]      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining 37,900   $ 41,100
United Western Bank [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross, Carrying Amount, Covered 113,700    
Atlantic Bank & Trust [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross, Carrying Amount, Covered 9,000    
Williamsburg First National Bank      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable, Gross, Carrying Amount, Covered $ 2,700