SHARE-BASED COMPENSATION PLANS - Company's restricted stock award activities (Details) - Incentive Plan 2017 - Restricted stock - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Share-Based Compensation Plans
Shares of Restricted Stock, Non-vested beginning of period	71,808	78,470
Shares of Restricted Stock, Issued	27,700	27,620
Shares of Restricted Stock, Vested	(28,243)	(34,282)
Shares of Restricted Stock, Forfeited	(2,175)
Shares of Restricted Stock, Non-vested end of period	69,090	71,808
Weighted Average Grant Date Fair Value, Non-vested beginning of period (in dollars per share)	$ 24.67	$ 23.11
Weighted Average Grant Date Fair Value, Issued (in dollars per share)	25.79	28.83
Weighted Average Grant Date Fair Value, Vested (in dollars per share)	23.60	24.46
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share)	25.13
Weighted Average Grant Date Fair Value, Non-vested end of period (in dollars per share)	$ 25.54	$ 24.67
Aggregate intrinsic value	$ 2.2