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STOCK BASED COMPENSATION PLANS - Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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