EMPLOYEE STOCK PLANS - Summary of Activity (Details) - Employee stock option - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Options
Outstanding, beginning of period (in shares)	298,995	339,376	358,073
Granted (in shares)	0	5,000	5,000
Exercised (in shares)	(20,499)	0	(7,655)
Forfeited or expired (in shares)	(90,221)	(45,381)	(16,042)
Outstanding, end of period (in shares)	188,275	298,995	339,376
Exercisable (in shares)	176,024	203,578	162,679
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 13.90	$ 14.13	$ 14.28
Granted (in dollars per share)	0.00	9.30	13.17
Exercised (in dollars per share)	12.97	0.00	12.97
Forfeited or expired (in dollars per share)	13.62	15.17	17.73
Outstanding, end of period (in dollars per share)	14.14	13.90	14.13
Exercisable (in dollars per share)	$ 13.92	$ 13.74	$ 13.81
Weighted Average Remaining Contractual Term
Outstanding	5 years 15 days
Exercisable	4 years 10 months 3 days
Aggregate Intrinsic Value
Outstanding	$ 0
Exercisable	$ 0