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EARNINGS PER SHARE - Calculation of Basic and Diluted 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
Earnings Per Share [Abstract]
Net income	$ 4,016	$ 2,774	$ 11,653	$ 8,084
Weighted average shares outstanding - basic (in shares)	8,099	8,075	8,092	8,068
Dilutive effect of share-based compensation (in shares)	172	164	182	147
Weighted average shares outstanding - diluted (in shares)	8,271	8,239	8,274	8,215
Per share information:
Basic earnings per share (in usd per share)	$ 0.50	$ 0.34	$ 1.44	$ 1.00
Diluted earnings per share (in usd per share)	$ 0.49	$ 0.34	$ 1.41	$ 0.98

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