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Note Transfers of financial assets and servicing assets (Fair value of purchased and originated MSRs, their related valuation assumptions and sensitivity) (Detail) - Residential Mortgage - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
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]      
Weighted average life 9 years 11 months 9 years 1 month  
Prepayment speed 6.30% 5.60%  
Originated MSRs      
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 $ 67,727   $ 69,400
Weighted average life 7 years 1 month   7 years 1 month
Prepayment speed 5.20%   5.10%
Impact on fair value of 10% adverse change $ (1,381)   $ (1,430)
Impact on fair value of 20% adverse change $ (2,720)   $ (2,817)
Discount rate 11.50%   11.50%
Impact on fair value of 10% adverse change $ (2,957)   $ (3,125)
Impact on fair value of 20% adverse change (5,698)   (6,019)
Purchased MSRs      
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 $ 100,086   $ 100,377
Weighted average life 6 years 7 months   6 years 7 months
Prepayment speed 5.60%   5.50%
Impact on fair value of 10% adverse change $ (2,169)   $ (2,200)
Impact on fair value of 20% adverse change $ (4,266)   $ (4,328)
Discount rate 11.00%   11.00%
Impact on fair value of 10% adverse change $ (4,232)   $ (4,354)
Impact on fair value of 20% adverse change $ (8,158)   $ (8,394)