EARNINGS PER SHARE (Computation of Basic and Diluted Earnings per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic
Net income per consolidated statements of income	$ 7,683	$ 7,113	$ 22,271	$ 19,268
Less: Earnings allocated to participating securities	(133)	(56)	(326)	(152)
Net income available to common stockholder	$ 7,550	$ 7,057	$ 21,945	$ 19,116
Weighted average common shares outstanding including participating securities	8,319,725	8,202,841	8,294,019	8,195,363
Less: Weighted average participating securities	(144,561)	(67,443)	(121,381)	(69,143)
Weighted average common shares outstanding	8,175,164	8,135,398	8,172,638	8,126,220
Basic earnings per common share (in dollars per share)	$ 0.92	$ 0.87	$ 2.69	$ 2.35
Diluted
Net income allocated to common shareholders	$ 7,550	$ 7,057	$ 21,945	$ 19,116
Weighted average common shares outstanding for basic earnings per common share	8,175,164	8,135,398	8,172,638	8,126,220
Average shares and dilutive potential common shares	8,348,970	8,289,732	8,339,958	8,281,021
Diluted earnings per common share (in dollars per share)	$ 0.90	$ 0.85	$ 2.63	$ 2.31
Stock Option
Diluted
Add: Dilutive effects of assumed exercise of stock options	128,060	154,334	123,524	154,801
Restricted stock
Diluted
Dilutive effects of assumed exercise of stock options/vesting of performance based restricted stock	45,746		43,796