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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 8,535	$ 6,556	$ 16,347	$ 10,767
Average number of basic common shares outstanding (in shares)	15,482,188	15,393,458	15,465,357	14,934,850
Plus: dilutive effect of stock options and awards outstanding (in shares)	89,263	112,800	94,614	114,467
Average number of diluted common shares outstanding (in shares)	15,571,451	15,506,258	15,559,971	15,049,317
Anti-dilutive options excluded from earnings calculation (in shares)	3,173	8,347	19,488	9,045
Earnings per share:
Basic (in dollars per share)	$ 0.55	$ 0.43	$ 1.06	$ 0.72
Diluted (in dollars per share)	$ 0.55	$ 0.42	$ 1.05	$ 0.72

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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