LOANS RECEIVABLE AND REVENUE - Revenue by Product (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue from External Customer [Line Items]
Revenue	$ 209,280	$ 182,003	$ 593,524	$ 645,318
Credit Services Organization Programs
Revenue from External Customer [Line Items]
Revenue	43,400	36,700	119,700	142,500
Consumer Portfolio Segment | Revolving LOC
Revenue from External Customer [Line Items]
Revenue	78,262	58,711	209,033	186,429
Consumer Portfolio Segment | Total Installment
Revenue from External Customer [Line Items]
Revenue	112,367	109,184	330,122	415,680
Consumer Portfolio Segment | Unsecured Installment
Revenue from External Customer [Line Items]
Revenue	72,056	67,408	213,233	260,328
Consumer Portfolio Segment | Secured Installment
Revenue from External Customer [Line Items]
Revenue	13,743	16,692	41,591	62,379
Consumer Portfolio Segment | Single-Pay
Revenue from External Customer [Line Items]
Revenue	26,568	25,084	75,298	92,973
Ancillary
Revenue from External Customer [Line Items]
Revenue	$ 18,651	$ 14,108	$ 54,369	$ 43,209