PREMISES AND EQUIPMENT - Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Amortization of right-of-use assets, finance leases	$ 65	$ 77
Interest on lease liabilities, finance leases	4	6
Operating lease cost	2,072	2,120
Short-term lease cost	27	72
Variable lease cost	38	38
Total lease cost	$ 2,206	$ 2,313