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STOCK PLANS (Non-Vested Stock Option Activity) (Details) - Stock options - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock Plans      
Balance of Nonvested Options (in shares) 409,559 458,382  
Options granted 182,615    
Vested (in shares) (205,066)    
Forfeited (in shares) (26,372)    
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) $ 14.32    
Granted, weighted average fair value at grant date (in dollars per share) 17.50 $ 12.55 $ 16.35
Vested, weighted average fair value at grant date (in dollars per share) 14.82    
Forfeited, weighted average fair value at grant date (in dollars per share) 14.58    
Balance at end of year, weighted average fair value at grant date (in dollars per share) $ 15.47 $ 14.32