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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, 2022
Dec. 31, 2021
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 7.27%  
Impact on fair value of 10% adverse change $ 8,471  
Impact on fair value of 20% adverse change $ (16,417)  
Weighted-average OAS 8.81%  
Impact on fair value of 10% adverse change $ 10,226  
Impact on fair value of 20% adverse change $ (19,830)  
Weighted-average discount rate 12.29% 9.80%
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%
Impact on fair value of 10% adverse change $ (6,467)  
Impact on fair value of 20% adverse change $ (12,498)