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STOCK-BASED COMPENSATION PLANS - Summary (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock Units
Stock-based compensation plans
Granted (in units)	73,700
Forfeited (in units)	(2,700)
Outstanding (in units)	71,000
Weighted Average Grant Date Assigned Value
Granted (in dollars per unit)	$ 18.98
Forfeited (in dollars per unit)	19.03
Outstanding (in dollars per unit)	$ 18.98
Restricted Stock Units | $12.71
Stock-based compensation plans
Outstanding (in units)	550
Weighted Average Grant Date Assigned Value
Exercisable (in dollars per unit)	$ 12.71
Weighted average remaining contractual term	1 month 6 days
Restricted Stock Units | $19.03
Stock-based compensation plans
Outstanding (in units)	70,450
Weighted Average Grant Date Assigned Value
Exercisable (in dollars per unit)	$ 19.03
Weighted average remaining contractual term	3 years
Stock Appreciation Rights
Stock-based compensation plans
Outstanding (in units)	110,160	91,800	116,280
Granted (in units)		110,160
Vested (in units)		(91,800)	(24,480)
Forfeited (in units)	(4,590)
Outstanding (in units)	105,570	110,160	91,800
Exercisable (in shares)	87,210
Weighted Average Grant Date Assigned Value
Outstanding (in dollars per unit)	$ 16.32
Outstanding (in dollars per unit)	16.32	$ 5.73	$ 5.66
Granted (in dollars per unit)		16.32
Exercised (in dollars per unit)		5.73	5.43
Forfeited (in dollars per unit)	16.32
Outstanding (in dollars per unit)	$ 16.32	$ 16.32	$ 5.73
Weighted average remaining contractual term	8 years 6 months

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

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Per share or unit weighted-average strike price of award under share-based payment arrangement.

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

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Weighted average strike price as of the grant date of equity-based award plans other than stock (unit) option plans that were forfeited 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 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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