EARNINGS PER SHARE - Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
EARNINGS PER SHARE
Average common shares outstanding	12,201	12,971
Net income	$ 20,456	$ 16,987
Earnings per common share - basic	$ 1.68	$ 1.31
Average common shares outstanding	12,201	12,971
Net effect of dilutive stock options - based on the treasury stock method using average market price	70	117
Diluted common shares	12,271	13,088
Net income	$ 20,456	$ 16,987
Earnings per common share - diluted	$ 1.67	$ 1.30