EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income, Basic	$ 5,037	$ 4,720	$ 10,064	$ 8,553
Net income, Diluted	5,037	4,720	10,064	8,553
Net income allocated to common shares, Basic	4,986	4,685	9,963	8,489
Net income allocated to common shares, Diluted	$ 4,986	$ 4,685	$ 9,963	$ 8,489
Basic Weighted-Average Shares Outstanding, Basic and Diluted	11,706	11,553	11,659	11,542
Dilutive effect of stock options and ESPP, Diluted	98	124	108	124
Diluted Weighted-Average Shares Outstanding, Diluted	11,804	11,677	11,767	11,666
Earnings Per Share, Basic	$ 0.43	$ 0.41	$ 0.85	$ 0.74
Earnings Per Share, Diluted	$ 0.42	$ 0.40	$ 0.85	$ 0.73
Restricted Stock [Member]
Net income allocated to restricted stock, Basic	$ (51)	$ (35)	$ (101)	$ (64)
Net income allocated to restricted stock, Diluted	$ (51)	$ (35)	$ (101)	$ (64)