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Servicing Assets and Residual Interests Economic Assumptions (Detail)
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Fixed Rate Residential Mortgage    
Assumption For Fair Value As Of Balance Sheet Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items]    
Weighted- Average Life (in years) 7 years 1 month 6 days 6 years 3 months 18 days
Prepayment Speed (annual) 10.70% 11.80%
Discount Rate (annual)   10.00%
OAS spread (bps) 566  
Adjustable Rate Residential Mortgage    
Assumption For Fair Value As Of Balance Sheet Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items]    
Weighted- Average Life (in years) 3 years 1 month 6 days 3 years 8 months 12 days
Prepayment Speed (annual) 28.40% 22.30%
Discount Rate (annual)   11.80%
OAS spread (bps)  929