SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Net income	$ 14,024	$ 14,688
Weighted-average common shares outstanding, basic	5,974	5,908
Basic earnings per share	$ 2.35	$ 2.49
Diluted earnings per share	$ 2.35	$ 2.49