Annual report pursuant to Section 13 and 15(d)

Loans and Leases and Allowance For Credit Losses (Textuals) (Details)

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Loans and Leases and Allowance For Credit Losses (Textuals) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Loans and Leases (Textuals)      
Amount of security for borrowing and advances $ 18,800,000,000    
Percentage interest in Merger Sub 100.00%    
Amount guaranteed by U.S. Government 96,703,000 98,288,000  
Amount of NAL foregone interest 38,400,000 59,700,000 92,700,000
Amount of interest recorded to interest income on NALs 5,100,000 5,500,000 7,200,000
Aggregate amount of net unamortized deferred loan origination fees and net unearned income 122,500,000 158,200,000  
Lease Financing Receivables Textuals [Abstract]      
Capital Leases, Future Minimum Payments Receivable 1,000,000,000    
Capital Leases, Future Minimum Payments Receivable, Current 400,000,000    
Capital Leases, Future Minimum Payments, Receivable in Two Years 200,000,000    
Capital Leases, Future Minimum Payments, Receivable in Three Years 200,000,000    
Capital Leases, Future Minimum Payments, Receivable in Four Years 100,000,000    
Capital Leases, Future Minimum Payments, Receivable Due Thereafter $ 100,000,000    
Automobile and other consumer loans [Member]
      
Loans and Leases (Textuals)      
Loans charged off or written down past due 120    
Redefault status number of days 120    
Commercial and Industrial and Commercial Real Estate [Member]
      
Loans and Leases (Textuals)      
Nonaccrual status number of days past due 90    
Loans charged off or written down past due 90    
Redefault status number of days 90    
Residential Mortgage [Member]
      
Loans and Leases (Textuals)      
Nonaccrual status number of days past due 150    
Loans charged off or written down past due 150    
Redefault status number of days 150    
Home equity secured by first-lien other [Member]
      
Loans and Leases (Textuals)      
Nonaccrual status number of days past due 150    
Loans charged off or written down past due 150    
Redefault status number of days 150    
Home equity Secured by second-lien [Member]
      
Loans and Leases (Textuals)      
Nonaccrual status number of days past due 120    
Loans charged off or written down past due 120    
Redefault status number of days 120