STOCK BASED COMPENSATION - Activity in Stock Options (Details) - Stock options $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares
Shares
Outstanding, beginning of year (in shares) | shares	193,114
Exercised (in shares) | shares	(91,556)
Forfeited or expired (in shares) | shares	(400)
Outstanding at end of period (in shares) | shares	101,158
Exercisable end of period (in shares) | shares	101,158
Fully vested and expected to vest (in shares) | shares	101,158
Weighted Average Exercise Price
Outstanding, beginning of year (in dollars per share) | $ / shares	$ 12.09
Exercised (in dollars per share) | $ / shares	12.49
Forfeited or expired (in dollars per share) | $ / shares	13.67
Outstanding, period end (in dollars per share) | $ / shares	11.72
Exercisable at end of period (in dollars per share) | $ / shares	11.72
Fully vested and expected to vest (in dollars per share) | $ / shares	$ 11.72
Stock options vested and currently exercisable
Outstanding at end of period, Weighted average remaining contractual term (years)	4 years 2 months 12 days
Outstanding at end of period, Aggregate intrinsic value | $	$ 2,488
Exercisable at end of period, Weighted average remaining contractual term (years)	4 years 2 months 12 days
Exercisable at end of period, Aggregate intrinsic value | $	$ 2,488
Fully vested and expected to vest, Weighted average remaining contractual term (years)	4 years 2 months 12 days
Fully vested and expected to vest, Aggregate intrinsic value | $	$ 2,488