EARNINGS PER SHARE - Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
EARNINGS PER SHARE
Average common shares outstanding (in shares)	11,642	12,032	11,704	12,116
Net income	$ 16,988	$ 18,320	$ 30,395	$ 38,776
Per common share amount	$ 1.46	$ 1.52	$ 2.60	$ 3.20
Average common shares outstanding (in shares)	11,642	12,032	11,704	12,116
Net effect of dilutive stock options - based on the treasury stock method using average market price (in shares)	59	37	59	53
Diluted common shares (in shares)	11,701	12,069	11,763	12,169
Net income	$ 16,988	$ 18,320	$ 30,395	$ 38,776
Per common share amount	$ 1.45	$ 1.52	$ 2.58	$ 3.19