BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Mar. 11, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unamortized retained loan discounts	$ 9,600	$ 7,800
Loan receivable, nonaccrual, past due period (more than)	60 days
Impairment (recovery) on loans receivable	$ 19	(16)
Loan loss reserves	943	885
PMC Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquisition discounts	$ 381	$ 492	$ 33,900