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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) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
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     14.50%
Impact on fair value of 10% adverse change $ (15,279)   $ (15,279)
Impact on fair value of 20% adverse change $ (29,189)   $ (29,189)
Weighted-average OAS 9.18%   9.18%
Impact on fair value of 10% adverse change $ (7,230)   $ (7,230)
Impact on fair value of 20% adverse change $ (14,020)   $ (14,020)
Weighted-average discount rate 9.40% 10.60%  
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% 18.00% 18.00%
Impact on fair value of 10% adverse change $ (7,024)   $ (7,024)
Impact on fair value of 20% adverse change $ (13,556)   $ (13,556)