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Fair value of purchased MSRs, their related valuation assumptions and sensitivity to immediate changes in those assumptions (Detail) (Residential Mortgage, Purchased Mortgage Servicing Rights M S R [Member], USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Residential Mortgage | Purchased Mortgage Servicing Rights M S R [Member]
   
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Interests Continued To Be Held By Transferor Fair Value $ 39,718 $ 45,346
Weighted average life (in years) 0 years 0 months 4344 days 0 years 0 months 3979 days
Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed 8.40% 9.20%
Impact on fair value of 10% adverse change (882) (1,969)
Impact on fair value of 20% adverse change (2,174) (3,478)
Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate 10.70% 10.80%
Impact on fair value of 10% adverse change (1,019) (2,073)
Impact on fair value of 20% adverse change $ (2,417) $ (3,655)