EARNINGS PER SHARE - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
EARNINGS PER SHARE
Average common shares outstanding	12,971	13,716
Net income and net income available to common stockholders	$ 16,987	$ 18,868
Per common share amount	$ 1.31	$ 1.38
Average common shares outstanding	12,971	13,716
Net effect of dilutive stock options - based on the treasury stock method using average market price	117	112
Diluted common shares	13,088	13,828
Net income and net income available to common stockholders	$ 16,987	$ 18,868
Per common share amount	$ 1.30	$ 1.36