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STOCK BASED COMPENSATION PLANS - Stock Units Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Weighted Average Grant Date Fair Value |  |  |
Unrecognized compensation cost | $ 0 |  |
Performance stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period required | 3 years | 3 years |
Number of Units Outstanding |  |  |
Beginning balance (in shares) | 43,058 | 37,865 |
Awarded (in shares) | 25,041 | 17,968 |
Vested (in shares) | (10,369) | (11,801) |
Forfeited (in shares) | (1,402) | (974) |
Ending balance (in shares) | 56,328 | 43,058 | 37,865
Weighted Average Grant Date Fair Value |  |  |
Beginning balance (usd per share) | $ 26.01 | $ 26.77 |
Granted (usd per share) | 25.07 | 23.24 |
Vested (usd per share) | 18.51 | 23.92 |
Forfeited (usd per share) | 29.13 | 28.78 |
Ending balance (usd per share) | $ 24.98 | $ 26.01 | $ 26.77
Intrinsic value of stock units vested and exercised | $ 174 | $ 376 | $ 337
Performance stock units | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for grant under this plan | 0 | 0 |
Performance stock units | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for grant under this plan | 37,562 | 26,956 |
Restricted stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Number of Units Outstanding |  |  |
Beginning balance (in shares) | 106,552 | 80,740 |
Awarded (in shares) | 63,667 | 50,352 |
Vested (in shares) | (31,565) | (19,411) |
Forfeited (in shares) | (7,256) | (5,129) |
Ending balance (in shares) | 131,398 | 106,552 | 80,740
Weighted Average Grant Date Fair Value |  |  |
Beginning balance (usd per share) | $ 25.82 | $ 28.24 |
Granted (usd per share) | 21.98 | 22.45 |
Vested (usd per share) | 27.38 | 26.11 |
Forfeited (usd per share) | 25.60 | 29.28 |
Ending balance (usd per share) | $ 23.57 | $ 25.82 | $ 28.24
Intrinsic value of stock units vested and exercised | $ 600 | $ 493 | $ 594
Unrecognized compensation cost | $ 2,200 |  |
Unrecognized compensation cost, expense recognition period | 1 year 7 months 13 days |  |
Restricted stock units | Minimum |  |  |
Weighted Average Grant Date Fair Value |  |  |
Granted (usd per share) | $ 20.44 | $ 22.07 |
Restricted stock units | Maximum |  |  |
Weighted Average Grant Date Fair Value |  |  |
Granted (usd per share) | $ 25.07 | $ 24.67 |

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