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Note Transfers of financial assets and servicing rights (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 MSRs - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
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]    
Fair value of servicing rights $ 95,043 $ 98,648
Weighted average life 7 years 4 months 7 years 4 months
Weighted average prepayment speed (annual rate) 6.00% 6.00%
Impact on fair value of 10% adverse change $ (2,376) $ (2,488)
Impact on fair value of 20% adverse change $ (4,982) $ (5,241)
Weighted average discount rate (annual rate) 11.50% 11.50%
Impact on fair value of 10% adverse change $ (3,853) $ (4,083)
Impact on fair value of 20% adverse change $ (7,723) $ (8,206)