STOCK-BASED COMPENSATION - Stock option activity (Details) - Stock options - $ / shares	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021
Number of Shares Underlying Options
Outstanding at beginning of period	191,560	201,720
Exercised	(15,240)	(2,032)
Forfeited/expired	(10,160)
Outstanding at end of period	166,160	199,688
Weighted Average Exercise Price
Outstanding at beginning of period	$ 17.53	$ 17.22
Exercised	11.32	11.32
Forfeited/expired	11.32
Outstanding at end of period	$ 18.48	$ 17.28

Weighted average price of options that were either forfeited or expired.

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

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