EARNINGS PER SHARE (Computation of Basic and Diluted Earnings Per Share) (Details) $ / shares in Units, $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2017 USD ($) $ / shares shares		Jun. 30, 2016 USD ($) $ / shares shares	[1]	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income | $		$ 10,234		$ 9,616		$ 20,310	$ 18,262
Dividends and undistributed earnings allocated to participating securities | $	[2]	(43)		(49)		(88)	(81)
Net income available to common shareholders | $		$ 10,191		$ 9,567		$ 20,222	$ 18,181
Weighted-average common shares outstanding for basic EPS		15,512,761		15,415,308		15,500,862	15,402,629
Dilutive effect of stock-based awards (shares)	[3]	73,810		75,702		75,849	70,169
Weighted-average common and potential common shares for diluted EPS (shares)		15,586,571		15,491,010		15,576,711	15,472,798
Basic EPS (in dollars per share) | $ / shares		$ 0.66	[2]	$ 0.62	[2]	$ 1.31	$ 1.18
Diluted EPS (in dollars per share) | $ / shares		$ 0.66	[2]	$ 0.62	[2]	$ 1.30	$ 1.18
Stock split conversion ratio						1.5
Employee Stock Option
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Stock options (shares)	[4]	585		18,375		585	18,375

[1] Share and per share amounts for the three and six months ended June 30, 2016 have been adjusted to reflect the three-for-two stock split effective September 30, 2016.

[2] Represents dividends paid and undistributed earnings allocated to nonvested stock-based awards that contain non-forfeitable rights to dividends.

[3] Represents the effect of the assumed exercise of stock options, vesting of restricted shares and vesting of restricted stock units utilizing the treasury stock method. Not included are the unvested LTIP awards as they have not met the performance criteria for the periods presented.

[4] Represents stock-based awards not included in the computation of potential common shares for purposes of calculating diluted EPS as the exercise prices were greater than the average market price of the Company's common stock and are considered anti-dilutive.