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Servicing Rights and Residual Interests Economic Assumptions (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 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) 6 years 10 months 24 days 6 years 7 months 6 days
Prepayment Speed (annual) 11.00% 11.30%
Discount Rate (annual)   10.00%
OAS spread (bps) 534  
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 4 months 24 days 3 years 8 months 12 days
Prepayment Speed (annual) 25.20% 22.30%
Discount Rate (annual)   11.70%
OAS spread (bps) 303