GOODWILL AND INTANGIBLE ASSETS - Schedule of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-lived Intangible Assets [Roll Forward]
Beginning Balance	$ 3,910	$ 356
Amortization expense	(1,570)	(286)	$ (102)
Ending Balance	7,180	3,910	$ 356
Core Deposit Intangibles
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets acquired	4,550	3,840
Non-compete agreement
Finite-lived Intangible Assets [Roll Forward]
Finite-lived intangible assets acquired	$ 290	$ 0