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WAREHOUSE AND OTHER LINES OF CREDIT - Additional Information (Details) | 1 Months Ended | 9 Months Ended
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Apr. 30, 2021 USD ($) | Feb. 28, 2021 USD ($) | Dec. 31, 2020 USD ($) | Oct. 31, 2020 USD ($) | Oct. 31, 2019 USD ($) | May 31, 2019 USD ($) | Sep. 30, 2021 USD ($) lineOfCredit
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Number of lines of credit held | lineOfCredit |  |  |  |  |  |  | 15
Restricted cash |  |  | $ 204,465,000 |  |  |  | $ 97,805,000
Warehouse Agreement Borrowings |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Restricted cash |  |  | 6,700,000 |  |  |  | $ 7,000,000
Warehouse Agreement Borrowings | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  | 1 year
Warehouse Agreement Borrowings | Maximum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  | 2 years
Warehouse and Revolving Credit Facilities |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 11,050,000,000
Weighted average interest rate |  |  |  |  |  |  | 2.06%
Securitization Facilities | 2019-1 Securitization Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 300,000,000 |
Debt instrument, term |  |  |  |  |  | 2 years |
Securitization Facilities | 2019-2 Securitization Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 300,000,000 |  |
Debt instrument, term |  |  |  |  | 2 years |  |
Securitization Facilities | 2020-1 Securitization Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 600,000,000 |  |  |
Debt instrument, term |  |  |  | 2 years |  |  |
Securitization Facilities | 2020-2 Securitization Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 500,000,000 |  |  |  |
Debt instrument, term |  |  | 3 years |  |  |  |
Securitization Facilities | 2021-1 Securitization Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 500,000,000 |  |  |  |  |
Debt instrument, term |  | 3 years |  |  |  |  |
Securitization Facilities | 2021-2 Securitization Facility |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 500,000,000 |  |  |  |  |  |
Debt instrument, term | 3 years |  |  |  |  |  |
Securitization Facilities | Minimum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  | 2 years
Securitization Facilities | Maximum |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  | 3 years

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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