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STOCK PLANS (Non-Vested Stock Option Activity) (Details) - Stock options - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock Plans      
Balance of Nonvested Options (in shares) 335,834 374,575  
Options granted (in shares) 222,589    
Vested (in shares) (199,026)    
Canceled (in shares) (1,360)    
Forfeited (in shares) (60,944)    
Nonvested stock options, Weighted Average Fair Value at Grant Date      
Balance at beginning of year, weighted average fair value at grant date (in dollars per share) $ 17.93    
Granted, weighted average fair value at grant date (in dollars per share) 15.97 $ 17.46 $ 18.97
Vested, weighted average fair value at grant date (in dollars per share) $ 17.91    
Canceled, weighted average fair value at grant date (in dollars per share) 15.77    
Forfeited, weighted average fair value at grant date (in dollars per share) $ 16.69    
Balance at end of year, weighted average fair value at grant date (in dollars per share) $ 16.88 $ 17.93