EMPLOYEE BENEFITS - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Employee Benefits
Total unrecognized compensation expense related to nonvested share-based arrangements	$ 1,500	$ 1,600
Weighted average period	2 years 6 months 9 days
Total fair value of shares vested	$ 336	82
Total stock-based compensation expense	4,900	1,600	$ 707
Total income tax benefit recognized for share-based arrangements	1,700	555	247
Stock-based compensation expense	4,880	1,587	707
Restricted Stock
Employee Benefits
Stock-based compensation expense	$ 757	$ 787	$ 800
2014 Plan | Restricted Stock
Employee Benefits
Number of units granted (in shares)	275,000
Units outstanding (in shares)	322,875	288,500