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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