EARNINGS PER COMMON SHARE (Computation of Basic and Diluted Earnings per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Basic
Net income per consolidated statements of income	$ 7,863	$ 7,683	$ 6,057	$ 8,531	$ 6,285	$ 7,113	$ 5,865	$ 6,291	$ 30,134	$ 25,554
Less: Earnings allocated to participating securities									(448)	(168)
Net income available to common stockholder									$ 29,686	$ 25,386
Weighted average common shares outstanding including participating securities									8,297,478	8,200,705
Less: Weighted average participating securities									(123,336)	(67,152)
Weighted average common shares outstanding									8,174,142	8,133,553
Basic earnings per common share (in dollars per share)	$ 0.95	$ 0.92	$ 0.73	$ 1.03	$ 0.77	$ 0.87	$ 0.72	$ 0.77	$ 3.63	$ 3.12
Diluted
Net income allocated to common shareholders									$ 29,686	$ 25,386
Weighted average common shares outstanding for basic earnings per common share									8,174,142	8,133,553
Average shares and dilutive potential common shares									8,339,141	8,288,524
Diluted earnings per common share (in dollars per share)	$ 0.93	$ 0.90	$ 0.71	$ 1.01	$ 0.75	$ 0.85	$ 0.70	$ 0.75	$ 3.56	$ 3.06
Stock Option
Diluted
Dilutive effects of assumed exercise of stock options/vesting of performance based restricted stock									125,085	137,089
Restricted stock
Diluted
Dilutive effects of assumed exercise of stock options/vesting of performance based restricted stock									39,914	17,882