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Securitizations and Variable Interest Entities ("VIEs") (Schedule of Certain Cash Flows Received from or Conveyed to VIEs Associated with Securitizations) (Detail) (Home Equity Loans [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Home Equity Loans [Member]
   
Securitizations And Variable Interest Entities [Line Items]    
Additional draws conveyed $ 5,133 $ 6,013
Servicing fees received 184 210
Other cash flows received $ 1,092 $ 1,263