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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - Key Economic Assumptions Used in Determining Fair Value at Time of Sale of Loans (Detail)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Maximum [Member] | Conventional Loan [Member]    
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items]    
Constant prepayment rate 18.40% 17.40%
Discount rate 10.00% 10.00%
Maximum [Member] | Conventional Non Conforming Mortgage Loans [Member]    
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items]    
Constant prepayment rate 21.90% 0.00%
Discount rate 14.50% 0.00%
Maximum [Member] | Government-guaranteed mortgage loans [Member]    
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items]    
Constant prepayment rate 18.30% 14.00%
Discount rate 12.00% 12.00%
Minimum [Member] | Conventional Loan [Member]    
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items]    
Constant prepayment rate 3.40% 3.60%
Discount rate 10.00% 10.00%
Minimum [Member] | Conventional Non Conforming Mortgage Loans [Member]    
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items]    
Constant prepayment rate 4.90% 0.00%
Discount rate 12.00% 0.00%
Minimum [Member] | Government-guaranteed mortgage loans [Member]    
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items]    
Constant prepayment rate 4.80% 4.50%
Discount rate 12.00% 12.00%
Weighted Average [Member] | Conventional Loan [Member]    
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items]    
Constant prepayment rate 6.60% 6.10%
Discount rate 10.00% 10.00%
Weighted Average [Member] | Conventional Non Conforming Mortgage Loans [Member]    
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items]    
Constant prepayment rate 6.60% 0.00%
Discount rate 12.30% 0.00%
Weighted Average [Member] | Government-guaranteed mortgage loans [Member]    
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items]    
Constant prepayment rate 6.70% 6.00%
Discount rate 12.00% 12.00%