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EARNINGS PER SHARE (Computation of Basic and Diluted 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	$ 12,217	$ 10,234	$ 25,037	$ 20,310
Dividends and undistributed earnings allocated to participating securities	(30)	(43)	(70)	(88)
Net income available to common shareholders	$ 12,187	$ 10,191	$ 24,967	$ 20,222
Weighted-average common shares outstanding for basic EPS	15,572,848	15,512,761	15,557,500	15,500,862
Dilutive effect of stock-based awards (shares)	56,931	73,810	57,538	75,849
Weighted-average common and potential common shares for diluted EPS (shares)	15,629,779	15,586,571	15,615,038	15,576,711
Basic EPS (in dollars per share)	$ 0.78	$ 0.66	$ 1.60	$ 1.31
Diluted EPS (in dollars per share)	$ 0.78	$ 0.66	$ 1.60	$ 1.30
Antidilutive Stock options (shares)	0	585	0	585

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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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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