CORE DEPOSIT INTANGIBLES - Schedule of Finite-Lived 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 of year	$ 4,706	$ 2,724
Effect of acquisitions	0	2,700
Amortization	(853)	(718)	$ (584)
End of year	$ 3,853	$ 4,706	$ 2,724