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STOCK BASED COMPENSATION PLANS - Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	$ 1,930	$ 1,352	$ 1,298
Stock options and restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	287	328	350
Tax benefit recognized from compensation expense	67	78	81
Restricted stock units and performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit recognized from compensation expense	383	244	221
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	385	170	237
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense	$ 1,258	$ 854	$ 711

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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-Publisher FASB
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