STOCK-BASED COMPENSATION (Analysis of Restricted Stock Award Activity) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($)
Weighted-Average Grant Date Fair Value
Allocated share-based compensation expense | $	$ 4,808	$ 3,696	$ 2,510
Restricted Stock Awards
Shares
Non-vested at beginning of period (in shares) | shares	182,086
Granted (in shares) | shares	111,509
Vested (in shares) | shares	(23,914)
Forfeited (in shares) | shares	(1,882)
Non-vested at end of period (in shares) | shares	267,799	182,086
Weighted-Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share) | $ / shares	$ 34.08
Granted (in dollars per share) | $ / shares	41.94
Vested (in dollars per share) | $ / shares	36.77
Forfeited (in dollars per share) | $ / shares	40.27
Non-vested at end of period (in dollars per share) | $ / shares	$ 37.07	$ 34.08
Allocated share-based compensation expense | $	$ 2,987	$ 1,766	924
Total compensation expense that has yet to be recognized | $	5,107
Intrinsic value of the unvested restricted stock awards outstanding | $	$ 2,279	$ 2,747	$ 1,520