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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 5,015	$ 8,970	$ 13,398	$ 16,347	$ 18,413	$ 25,317
Average number of basic common shares outstanding (in shares)	15,547,276	15,503,488			15,536,414	15,478,207
Plus: dilutive effect of stock options and awards outstanding (in shares)	34,027	76,575			45,282	85,559
Average number of diluted common shares outstanding (in shares)	15,581,303	15,580,063			15,581,696	15,563,766
Anti-dilutive options excluded from earnings calculation (in shares)	0	0			0	14,394
Earnings per share:
Basic (in dollars per share)	$ 0.32	$ 0.58			$ 1.19	$ 1.64
Diluted (in dollars per share)	$ 0.32	$ 0.58			$ 1.18	$ 1.63

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