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Key economic assumptions used to estimate the fair value of MSRs derived from sales and securitizations of mortgage loans performed by the banking subsidiaries (Detail) - Residential Mortgage - Originated Mortgage Servicing Rights M S R [Member] - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
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 $ 104,082 $ 110,534
Weighted average life (in years) 2519 days 4271 days
Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed 7.00% 8.60%
Impact on fair value of 10% adverse change $ (676) $ (4,089)
Impact on fair value of 20% adverse change $ (3,951) $ (7,995)
Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate 11.50% 11.50%
Impact on fair value of 10% adverse change $ (1,801) $ (4,492)
Impact on fair value of 20% adverse change $ (6,021) $ (8,701)