EARNINGS PER SHARE - Earnings Per Share Computations (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
EARNINGS PER SHARE
Weighted average shares outstanding for basic earnings per common share	25,418,712	25,622,338	25,484,329	25,576,740
Dilutive effect of stock options, awards and warrants	68,590	174,358	134,072	168,289
Weighted average shares outstanding for diluted earnings per common share	25,487,302	25,796,696	25,618,401	25,745,029
Basic earnings per common share	$ 0.89	$ 0.84	$ 2.34	$ 2.54
Diluted earnings per common share	$ 0.89	$ 0.83	$ 2.33	$ 2.52