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STOCK-BASED COMPENSATION PLANS - Summary (Details) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Restricted Stock Units |  |
Stock-based compensation plans |  |
Outstanding (in units) | 71,000 |
Granted (in units) | 46,347 | 73,150
Vested (in units) | (20,225) |
Outstanding (in units) | 97,122 | 73,150
Weighted Average Grant Date Assigned Value |  |
Outstanding (in dollars per unit) | $ 18.98 |
Granted (in dollars per unit) | 15.53 | $ 19.03
Vested (in dollars per unit) | 18.86 |
Outstanding (in dollars per unit) | $ 17.36 | $ 19.03
Restricted Stock Units | $ 15.53 |  |
Stock-based compensation plans |  |
Outstanding (in units) | 46,347 |
Weighted Average Grant Date Assigned Value |  |
Outstanding (in dollars per unit) | $ 15.53 |
Weighted average remaining contractual term | 2 years 9 months 18 days |
Restricted Stock Units | $19.03 |  |
Stock-based compensation plans |  |
Outstanding (in units) | 50,775 |
Weighted Average Grant Date Assigned Value |  |
Outstanding (in dollars per unit) | $ 19.03 |
Weighted average remaining contractual term | 2 years 9 months 18 days |
Performance restricted stock units |  |
Stock-based compensation plans |  |
Granted (in units) | 43,046 |
Outstanding (in units) | 43,046 |
Weighted Average Grant Date Assigned Value |  |
Granted (in dollars per unit) | $ 15.53 |
Outstanding (in dollars per unit) | $ 15.53 |
Performance restricted stock units | $ 15.53 |  |
Stock-based compensation plans |  |
Outstanding (in units) | 43,046 |
Weighted Average Grant Date Assigned Value |  |
Outstanding (in dollars per unit) | $ 15.53 |
Weighted average remaining contractual term | 2 years 10 months 24 days |
Stock Appreciation Rights |  |
Stock-based compensation plans |  |
Outstanding (in units) | 105,570 | 110,160
Granted (in units) |  |
Expired (in units) | (1,530) |
Outstanding (in units) | 104,040 | 110,160
Exercisable (in shares) | 85,680 |
Weighted Average Grant Date Assigned Value |  |
Outstanding (in dollars per unit) | $ 16.32 | $ 16.32
Expired (in dollars per unit) | (16.32) |
Outstanding (in dollars per unit) | $ 16.32 | $ 16.32
Weighted average remaining contractual term | 7 years 10 months 24 days |

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