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Number of Loans and Leases Modified in Troubled Debt Restructurings During the Previous 12 months which Became Nonperforming as well as the Recorded Investment and Unpaid Principal Balance of Those TDRs (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Contract
Sep. 30, 2011
Contract
Number of Loans and Lease33133
Recorded Investment$ 23.1$ 70.0
Unpaid Principal Balance27.884.0
Commercial
  
Number of Loans and Lease819
Recorded Investment16.048.0
Unpaid Principal Balance18.756.1
Commercial | Commercial Real Estates
  
Number of Loans and Lease614
Recorded Investment10.639.4
Unpaid Principal Balance12.346.0
Commercial | Commercial and Institutional
  
Number of Loans and Lease25
Recorded Investment5.48.6
Unpaid Principal Balance6.410.1
Personal
  
Number of Loans and Lease25114
Recorded Investment7.122.0
Unpaid Principal Balance9.127.9
Personal | Residential Real Estate
  
Number of Loans and Lease25113
Recorded Investment7.122.0
Unpaid Principal Balance$ 9.1$ 27.9
Personal | Private Client
  
Number of Loans and Lease 1