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SHARE-BASED COMPENSATION PLANS - Company's stock option exercise activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
SHARE-BASED COMPENSATION PLANS
Total intrinsic value of stock options exercised		$ 87
Net proceeds from stock option exercises	$ 0	161
Income tax benefit from the exercise of stock options		23
Total fair value of stock options vested	$ 661	$ 750

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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