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DESCRIPTION OF BUSINESS, PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Risk (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Loan Originations Benchmark | Geographic Concentration Risk | California    
Concentration of Risk [Line Items]    
Concentration risk, percentage 29.00% 33.00%
Mortgage Loans Benchmark | Investor Concentration Risk | Investor 1    
Concentration of Risk [Line Items]    
Concentration risk, percentage   41.00%
Mortgage Loans Benchmark | Investor Concentration Risk | Investor 2    
Concentration of Risk [Line Items]    
Concentration risk, percentage   33.00%
Mortgage Loans Benchmark | Investor Concentration Risk | Investor 3    
Concentration of Risk [Line Items]    
Concentration risk, percentage   14.00%
Warehouse Lines of Credit Benchmark | Lender Concentration Risk | Lender 1    
Concentration of Risk [Line Items]    
Concentration risk, percentage   19.00%
Warehouse Lines of Credit Benchmark | Lender Concentration Risk | Lender 2    
Concentration of Risk [Line Items]    
Concentration risk, percentage   16.00%