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STOCK-BASED COMPENSATION PLANS - Summary of equity award activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock-based compensation plans
Expirations (in shares)	0	0	(1,530)
Weighted Average Grant Date Assigned Value
Expired (in dollars per share)	$ 0	$ 0	$ 16.32
Restricted stock units
Stock-based compensation plans
Outstanding (in shares)	139,986	109,244	71,000
Granted (in shares)	41,847	66,995	59,994
Exercised (in shares)	(51,693)	(34,925)	(20,225)
Forfeited (in shares)	(1,981)	(1,328)	(1,525)
Outstanding (in shares)	128,159	139,986	109,244
Weighted Average Grant Date Assigned Value
Outstanding (in dollars per share)	$ 18.01	$ 17.27	$ 18.98
Granted (in dollars per share)	22.72	18.81	15.81
Exercised (in dollars per share)	17.91	17.26	18.86
Forfeited (in dollars per share)	19.55	18.35	18.11
Outstanding (in dollars per share)	$ 19.56	$ 18.01	$ 17.27
Performance restricted stock units
Stock-based compensation plans
Outstanding (in shares)	62,067	38,344	0
Granted (in shares)	17,030	23,723	38,344
Vested (in shares)	0	0	0
Forfeited (in shares)	0	0	0
Outstanding (in shares)	79,097	62,067	38,344
Weighted Average Grant Date Assigned Value
Outstanding (in dollars per share)	$ 17.02	$ 15.72	$ 0
Granted (in dollars per share)	22.72	19.14	15.72
Vested (in dollars per share)	0	0	0
Forfeited (in dollars per share)	0	0	0
Outstanding (in dollars per share)	$ 18.25	$ 17.02	$ 15.72
Stock appreciation rights
Stock-based compensation plans
Outstanding (in shares)	73,440	97,920	105,570
Granted (in shares)	0	0	0
Exercised (in shares)	0	(24,480)	(6,120)
Forfeited (in shares)	0	0	0
Outstanding (in shares)	73,440	73,440	97,920
Weighted Average Grant Date Assigned Value
Outstanding (in dollars per share)	$ 16.32	$ 16.32	$ 16.32
Granted (in dollars per share)	0	0	0
Exercised (in dollars per share)	0	16.32	16.32
Forfeited (in dollars per share)	0	0	0
Outstanding (in dollars per share)	$ 16.32	$ 16.32	$ 16.32
Weighted average remaining contractual term	5 years 8 months 12 days

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- Definition

Per share or unit weighted-average fair value of award under share-based payment arrangement.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were exercised during the period.

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The weighted average fair value at grant date for equity-based awards issued during the period on other than stock (or unit) option plans.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Number of non-option equity instruments exercised by participants.

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Number of shares under non-option equity instrument agreements for which rights to exercise lapsed.

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Net number of non-option equity instruments granted to participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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