EARNINGS PER SHARE - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net earnings (basic)	$ 10,738	$ 10,962
Net earnings (diluted)	$ 10,738	$ 10,962
Denominator:
Weighted-average shares outstanding (basic) (in shares)	12,109,074	12,038,638
Effect of dilutive securities:
Common stock equivalent shares from stock options (in shares)	151,871	139,138
Weighted-average shares outstanding (diluted) (in shares)	12,260,945	12,177,776
Net earnings per share
Basic (in USD per share)	$ 0.89	$ 0.91
Diluted (in USD per share)	$ 0.88	$ 0.90