STOCK-BASED COMPENSATION - Recognized Compensation Expense (Details) - Stock Options - 2008 Plan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total gross compensation expense	$ 138	$ 57	$ 765	$ 200
Total tax benefit associated with compensation expense	7	9	43	37
Total net compensation expense	131	$ 48	722	$ 163
Total gross unrecognized compensation expense
Six months ending December 31, 2018	1		1
2019	481		481
2020	138		138
2021	0		0
Tax benefit associated with unrecognized compensation expense
Six months ending December 31, 2018	0		0
2019	19		19
2020	7		7
2021	0		0
Total net unrecognized compensation expense
Six months ending December 31, 2018	1		1
2019	462		462
2020	131		131
2021	$ 0		$ 0