LOANS RECEIVABLE - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 21, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans originated under the Paycheck Protection Program	$ 11,820	$ 2,961
Loans receivable	$ 84,768			$ 83,136
Loans, percent current	98.70%			98.80%
Loans receivable, net	$ 84,441			$ 83,135
Accounts Receivable | Customer Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percent	99.30%			99.10%
Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net	$ 1,300			$ 1,400
SBA 7(a) loans receivable, paycheck protection program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans originated under the Paycheck Protection Program			$ 26,200
Loans receivable	$ 17,286			$ 14,484