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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 8,970	$ 8,617	$ 25,317	$ 19,386
Average number of basic common shares outstanding (in shares)	15,503,488	15,420,499	15,478,207	15,098,377
Plus: dilutive effect of stock options and awards outstanding (in shares)	76,575	90,026	85,559	105,661
Average number of diluted common shares outstanding (in shares)	15,580,063	15,510,525	15,563,766	15,204,038
Anti-dilutive options excluded from earnings calculation (in shares)	0	0	14,394	8,247
Earnings per share:
Basic (in dollars per share)	$ 0.58	$ 0.56	$ 1.64	$ 1.27
Diluted (in dollars per share)	$ 0.58	$ 0.56	$ 1.63	$ 1.27

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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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