CONSUMER LOANS - Consumer Loan Investments made through Equity Method Investees (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Weighted Average Expected Life (Years)	1 year
Consumer Portfolio Segment
Schedule of Equity Method Investments [Line Items]
Unpaid Principal Balance	$ 1,475,494	$ 330,428
Carrying Value	$ 1,436,080	$ 363,756
Weighted Average Coupon	12.40%	17.80%
Weighted Average Expected Life (Years)	1 year 8 months 12 days	3 years 4 months 24 days
Consumer Portfolio Segment | SpringCastle
Schedule of Equity Method Investments [Line Items]
Unpaid Principal Balance	$ 275,053	$ 330,428
Carrying Value	$ 303,881	$ 363,756
Weighted Average Coupon	18.20%	17.80%
Weighted Average Expected Life (Years)	3 years 7 months 6 days	3 years 4 months 24 days
Consumer Portfolio Segment | Marcus
Schedule of Equity Method Investments [Line Items]
Unpaid Principal Balance	$ 1,200,441	$ 0
Carrying Value	$ 1,132,199	$ 0
Weighted Average Coupon	11.10%	0.00%
Weighted Average Expected Life (Years)	1 year 3 months 18 days