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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)
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
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 6.80% 6.30%
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 9.30% 9.60%
Discount rate 14.30% 14.30%
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 6.30% 5.70%
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 6.70% 6.20%
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 9.00% 9.10%
Discount rate 14.30% 14.30%
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 6.20% 5.60%
Discount rate 12.00% 12.00%