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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 7,281	$ 7,812
Average number of basic common shares outstanding (in shares)	15,523,423	15,448,338
Plus: dilutive effect of stock options and awards outstanding (in shares)	63,226	104,631
Average number of diluted common shares outstanding (in shares)	15,586,649	15,552,969
Anti-dilutive options excluded from earnings calculation (in shares)	0	1,230
Earnings per share:
Basic (in dollars per share)	$ 0.47	$ 0.51
Diluted (in dollars per share)	$ 0.47	$ 0.50

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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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