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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES (VIEs) AND SERVICING ASSETS - Key Economic Assumptions Used in Determining Fair Value at Time of Sale of Loans (Details)
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
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 7.00% 6.90%
Discount rate 9.50% 9.50%
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 6.10% 6.00%
Discount rate 11.70% 11.50%
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 6.60% 6.80%
Discount rate 11.50% 11.50%
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 15.90% 20.60%
Discount rate 9.50% 9.50%
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 9.00% 7.60%
Discount rate 12.50% 12.50%
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 16.60% 17.10%
Discount rate 11.50% 11.50%
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 2.40% 2.10%
Discount rate 9.50% 9.50%
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 2.40% 3.00%
Discount rate 11.00% 11.00%
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 3.60% 3.20%
Discount rate 11.50% 11.50%