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WAREHOUSE AND OTHER LINES OF CREDIT - Additional Information (Details)	1 Months Ended						9 Months Ended
	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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Number Of Lines Of Credit Held

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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.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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