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STOCK-BASED COMPENSATION PLANS - Summary (Details) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Restricted Stock Units |  |
Stock-based compensation plans |  |
Outstanding (in units) | 109,244 | 71,000
Granted (in units) | 46,312 | 46,347
Exercised (in units) | (34,925) | (20,225)
Outstanding (in units) | 120,631 | 97,122
Weighted Average Grant Date Assigned Value |  |
Outstanding (in dollars per unit) | $ 17.27 | $ 18.98
Granted (in dollars per unit) | 19.11 | 15.53
Exercised (in dollars per unit) | 17.26 | 18.86
Outstanding (in dollars per unit) | $ 17.98 | $ 17.36
Performance Shares |  |
Stock-based compensation plans |  |
Outstanding (in units) | 38,344 |
Granted (in units) | 23,723 | 28,697
Outstanding (in units) | 62,067 | 28,697
Weighted Average Grant Date Assigned Value |  |
Outstanding (in dollars per unit) | $ 15.72 |
Granted (in dollars per unit) | 19.14 | $ 15.53
Outstanding (in dollars per unit) | $ 17.02 | $ 15.53
Stock Appreciation Rights |  |
Stock-based compensation plans |  |
Outstanding (in units) | 97,920 | 105,570
Granted (in units) |  |
Exercised (in units) | (6,120) |
Expired (in units) |  | (1,530)
Outstanding (in units) | 91,800 | 104,040
Exercisable (in shares) | 79,560 |
Weighted Average Grant Date Assigned Value |  |
Outstanding (in dollars per unit) | $ 16.32 | $ 16.32
Exercised (in dollars per unit) | 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 |

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