SUBSEQUENT EVENTS - Schedule of Securitization Transaction of Notes (Details) - USD ($)	Oct. 01, 2021	Jul. 22, 2021	Apr. 26, 2021
Class A-2
Subsequent Event [Line Items]
Seniority		Senior	Senior
Principal Balance		$ 209,000,000	$ 97,104,000
Coupon		6.00%	4.75%
Weighted Average Life (Years)		2 years 3 days	2 years 3 months
Non-Call Period (Months)		6 months	6 months
Anticipated Call Date		Jul. 25, 2023	Jul. 25, 2023
Final Legal Maturity Date		Jul. 25, 2051	Apr. 25, 2051
Class B-2
Subsequent Event [Line Items]
Seniority		Senior Subordinated	Senior Subordinated
Principal Balance		$ 84,000,000	$ 32,368,000
Coupon		7.00%	8.00%
Weighted Average Life (Years)		2 years 3 days	2 years 3 months
Non-Call Period (Months)		6 months	6 months
Anticipated Call Date		Jul. 25, 2023	Jul. 25, 2023
Final Legal Maturity Date		Jul. 25, 2051	Apr. 25, 2051
Class M-2
Subsequent Event [Line Items]
Seniority		Subordinated	Subordinated
Principal Balance		$ 57,000,000	$ 15,000,000
Coupon		9.50%	9.00%
Weighted Average Life (Years)		2 years 3 days	2 years 3 months
Non-Call Period (Months)		6 months	6 months
Anticipated Call Date		Jul. 25, 2023	Jul. 25, 2023
Final Legal Maturity Date		Jul. 25, 2051	Apr. 25, 2051
Subsequent Event | Class A-2
Subsequent Event [Line Items]
Seniority	Senior
Principal Balance	$ 150,000,000
Coupon	7.00%
Weighted Average Life (Years)	1 year 9 months 25 days
Non-Call Period (Months)	6 months
Anticipated Call Date	Jul. 25, 2023
Final Legal Maturity Date	Jul. 25, 2051
Subsequent Event | Class B-2
Subsequent Event [Line Items]
Seniority	Senior Subordinated
Principal Balance	$ 50,000,000
Coupon	9.00%
Weighted Average Life (Years)	1 year 9 months 25 days
Non-Call Period (Months)	6 months
Anticipated Call Date	Jul. 25, 2023
Final Legal Maturity Date	Jul. 25, 2051
Subsequent Event | Class M-2
Subsequent Event [Line Items]
Seniority	Subordinated
Principal Balance	$ 50,000,000
Coupon	10.00%
Weighted Average Life (Years)	1 year 9 months 25 days
Non-Call Period (Months)	6 months
Anticipated Call Date	Jul. 25, 2023
Final Legal Maturity Date	Jul. 25, 2051