EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic earnings per share
Net income	$ 44,718	$ 41,334	$ 31,897
Weighted average common shares outstanding (in shares)	24,533,180	24,184,790	23,858,696
Basic earnings per common share (in dollars per share)	$ 1.82	$ 1.71	$ 1.34
Diluted earnings per share
Net income	$ 44,718	$ 41,334	$ 31,897
Weighted average common shares outstanding for basic earnings per common share (in shares)	24,533,180	24,184,790	23,858,696
Add: Dilutive effects of restricted stock and options (in shares)	196,355	290,908	280,310
Average shares and dilutive potential common shares (in shares)	24,729,535	24,475,698	24,139,006
Diluted earnings per common share (in dollars per share)	$ 1.81	$ 1.69	$ 1.32
Securities excluded from the computation of diluted earnings per common share	0	0	0