PREMISES AND EQUIPMENT - Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Premises and equipment
Gross premises and equipment	$ 40,392	$ 35,014
Accumulated depreciation	(14,189)	(13,040)
Premises and equipment, net	26,203	21,974
Land
Premises and equipment
Gross premises and equipment	3,936	3,105
Buildings and improvements
Premises and equipment
Gross premises and equipment	14,350	13,352
Furniture, fixtures and equipment
Premises and equipment
Gross premises and equipment	18,701	15,553
Construction in progress
Premises and equipment
Gross premises and equipment	326	1,019
Leasehold improvements
Premises and equipment
Gross premises and equipment	$ 3,079	$ 1,985