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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 6,117	$ 7,281	$ 8,535	$ 7,812	$ 13,398	$ 16,347
Average number of basic common shares outstanding (in shares)	15,538,282		15,482,188		15,530,893	15,465,357
Plus: dilutive effect of stock options and awards outstanding (in shares)	47,299		89,263		51,340	94,614
Average number of diluted common shares outstanding (in shares)	15,585,581		15,571,451		15,582,233	15,559,971
Anti-dilutive options excluded from earnings calculation (in shares)	0		3,173		0	19,488
Earnings per share:
Basic (in dollars per share)	$ 0.39		$ 0.55		$ 0.86	$ 1.06
Diluted (in dollars per share)	$ 0.39		$ 0.55		$ 0.86	$ 1.05

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