LOANS RECEIVABLE AND REVENUE - Revenue by Product (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue from External Customer [Line Items]
Revenue	$ 187,693	$ 182,509	$ 384,244	$ 463,315
Credit Services Organization Programs
Revenue from External Customer [Line Items]
Revenue	34,900	37,800	76,400	105,800
Consumer Portfolio Segment | Revolving LOC
Revenue from External Customer [Line Items]
Revenue	68,036	56,736	130,771	127,718
Consumer Portfolio Segment | Total Installment
Revenue from External Customer [Line Items]
Revenue	101,367	112,562	217,755	306,414
Consumer Portfolio Segment | Unsecured Installment
Revenue from External Customer [Line Items]
Revenue	64,783	70,429	141,177	192,838
Consumer Portfolio Segment | Secured Installment
Revenue from External Customer [Line Items]
Revenue	12,821	19,401	27,848	45,687
Consumer Portfolio Segment | Single-Pay
Revenue from External Customer [Line Items]
Revenue	23,763	22,732	48,730	67,889
Ancillary
Revenue from External Customer [Line Items]
Revenue	$ 18,290	$ 13,211	$ 35,718	$ 29,183