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STOCK-BASED COMPENSATION PLANS - Summary (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restricted Stock Units        
Stock-based compensation plans        
Outstanding (in units) 99,597 73,700 71,000  
Granted (in units) 50,347 73,700
Exercised (in units)     (20,225)  
Forfeited (in units)     (1,525)  
Outstanding (in units) 99,597 73,700 99,597 73,700
Weighted Average Grant Date Assigned Value        
Outstanding (in dollars per unit) $ 17.37 $ 18.98 $ 18.98  
Granted (in dollars per unit) 15.72 $ 18.98
Exercised (in dollars per unit)     18.86  
Forfeited (in dollars per unit)     18.11  
Outstanding (in dollars per unit) $ 17.37 $ 18.98 $ 17.37 $ 18.98
Performance Shares        
Stock-based compensation plans        
Outstanding (in units) 43,046      
Granted (in units)     43,046  
Outstanding (in units) 43,046   43,046  
Weighted Average Grant Date Assigned Value        
Outstanding (in dollars per unit) $ 15.53      
Granted (in dollars per unit)     $ 15.53  
Outstanding (in dollars per unit) $ 15.53   $ 15.53  
Stock Appreciation Rights        
Stock-based compensation plans        
Outstanding (in units) 97,920 110,160 105,570 110,160
Granted (in units)    
Exercised (in units)     (6,120)  
Expired (in units)     (1,530)  
Outstanding (in units) 97,920 110,160 97,920 110,160
Exercisable (in shares) 85,680   85,680  
Weighted Average Grant Date Assigned Value        
Outstanding (in dollars per unit) $ 16.32 $ 16.32 $ 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 $ 16.32 $ 16.32
Weighted average remaining contractual term     7 years 6 months