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Capitalized Servicing Assets - Economic Assumptions Used to Determine Fair Value of Capitalized Servicing Rights and Sensitivity of Value to Changes in Assumptions (Detail)
12 Months Ended
Dec. 31, 2015
USD ($)
Residential Mortgage Loans [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]  
Weighted-average prepayment speeds 11.92%
Impact on fair value of 10% adverse change $ (9,208,000)
Impact on fair value of 20% adverse change $ (17,696,000)
Weighted-average OAS 11.19%
Impact on fair value of 10% adverse change $ (7,758,000)
Impact on fair value of 20% adverse change $ (15,011,000)
Commercial Mortgage Loans [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]  
Weighted-average discount rate 18.00%
Impact on fair value of 10% adverse change $ (4,302,000)
Impact on fair value of 20% adverse change $ (8,300,000)