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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Basic
Net income per consolidated statements of income	$ 13,336	$ 10,811	$ 25,453	$ 16,908
Less: Earnings allocated to participating securities	(84)	(95)	(106)	(164)
Net income available to common stockholder	$ 13,252	$ 10,716	$ 25,347	$ 16,744
Weighted average common shares outstanding including participating securities	8,343,946	8,294,801	8,329,003	8,299,503
Less: Weighted average participating securities	(31,712)	(73,053)	(34,599)	(80,650)
Weighted average common shares outstanding	8,312,234	8,221,748	8,294,404	8,218,853
Basic earnings per common share (in dollars per share)	$ 1.59	$ 1.30	$ 3.06	$ 2.04
Diluted
Net income available to common shareholders	$ 13,252	$ 10,716	$ 25,347	$ 16,744
Weighted average common shares outstanding for basic earnings per common share	8,312,234	8,221,748	8,294,404	8,218,853
Average shares and dilutive potential common shares	8,543,474	8,359,450	8,496,945	8,391,514
Diluted earnings per common share (in dollars per share)	$ 1.55	$ 1.28	$ 2.98	$ 2.00
Stock Option
Diluted
Add: Dilutive effects of assumed exercise of stock options	162,674	74,597	153,545	108,905
Performance-Based Restricted Stock Units (PRSUs)
Diluted
Dilutive effects of assumed vesting units	38,495	63,105	31,613	63,756
Restricted stock
Calculations of basic and diluted earnings per share
Number of antidilutive shares not considered in computing diluted earnings per share	105,424		105,424
Diluted
Dilutive effects of assumed vesting units	30,071		17,383