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Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities (Tables)
 6 Months Ended
Jun. 30, 2011
Commitments, off-balance Sheet Arrangements, and Contingent Liabilities [Abstract]  
Summary of lending-related and other commitments
                 
    June 30, 2011     December 31, 2010  
    ($ in Thousands)  
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (1) (2)
  $ 4,019,334     $ 3,862,208  
Commercial letters of credit (1)
    44,582       37,872  
Standby letters of credit (3)
    326,408       362,275