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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