STOCK-BASED COMPENSATION PLANS - Activity of unvested Restricted Stock Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Restricted Shares
Unvested, beginning of period (in shares)	31,999	47,820
Awards (in shares)	52,588	35,815
Forfeitures (in shares)	(2,874)	(51,000)
Vestings (in shares)	(575)	(636)
Unvested, end of period (in shares)	81,138	31,999	47,820
Weighted-average grant date fair value
Unvested, beginning of period (in dollars per share)	$ 34.93	$ 29.71
Awards (in dollars per share)	25.36	34.93
Forfeitures (in dollars per share)	34.93	30.02
Vestings (in dollars per share)	34.93	35.89
Unvested, end of period (in dollars per share)	$ 27.15	$ 34.93	$ 29.71
Restricted Stock
STOCK-BASED COMPENSATION PLANS
Vesting period	5 years
Restricted Shares
Unvested, beginning of period (in shares)	133,520	129,448
Awards (in shares)	70,338	56,871
Forfeitures (in shares)	(2,648)	(2,940)
Vestings (in shares)	(51,647)	(49,859)
Unvested, end of period (in shares)	149,563	133,520	129,448
Weighted-average grant date fair value
Unvested, beginning of period (in dollars per share)	$ 67.89	$ 64.32
Awards (in dollars per share)	54.03	71.58
Forfeitures (in dollars per share)	60.56	67.44
Vestings (in dollars per share)	65.55	62.86
Unvested, end of period (in dollars per share)	$ 62.31	$ 67.89	$ 64.32
Unrecognized stock-based compensation expense	$ 5,900
Award vesting period	5 years
Weighted-average period for recognition of unrecognized compensation cost	1 year 8 months 12 days
Total fair value of restricted stock vested	$ 3,400	$ 3,100	$ 2,500
Performance Awards
STOCK-BASED COMPENSATION PLANS
Stock-based compensation expense	$ 4,500	3,800	2,800
Vesting period	3 years
Restricted Shares
Unvested, end of period (in shares)	81,138
Weighted-average grant date fair value
Unrecognized stock-based compensation expense	$ 1,900
Award vesting period	3 years
Weighted-average period for recognition of unrecognized compensation cost	1 year 9 months 18 days
Total fair value of restricted stock vested		$ 20	$ 10
Performance Awards | Granted prior to 2022
STOCK-BASED COMPENSATION PLANS
Vesting period	5 years
Weighted-average grant date fair value
Award vesting period	5 years
Performance Awards | Granted in 2022 and thereafter
STOCK-BASED COMPENSATION PLANS
Vesting period	3 years
Weighted-average grant date fair value
Award vesting period	3 years