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DESCRIPTION OF BUSINESS, PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Risk (Details) | 6 Months Ended
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Jun. 30, 2022
Loan Originations Benchmark | Geographic Concentration Risk | California |
Concentration of Risk [Line Items] |
Concentration risk, percentage | 23.00%
Mortgage Loans Benchmark | Investor Concentration Risk | Investor 1 |
Concentration of Risk [Line Items] |
Concentration risk, percentage | 32.00%
Mortgage Loans Benchmark | Investor Concentration Risk | Investor 2 |
Concentration of Risk [Line Items] |
Concentration risk, percentage | 27.00%
Mortgage Loans Benchmark | Investor Concentration Risk | Investor 3 |
Concentration of Risk [Line Items] |
Concentration risk, percentage | 19.00%
Warehouse Lines of Credit Benchmark | Lender Concentration Risk | Lender 1 |
Concentration of Risk [Line Items] |
Concentration risk, percentage | 14.00%
Warehouse Lines of Credit Benchmark | Lender Concentration Risk | Lender 2 |
Concentration of Risk [Line Items] |
Concentration risk, percentage | 15.00%

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