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STOCK PLANS (Non-Vested Stock Option Activity) (Details) - Stock options - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Plans      
Balance of Nonvested Options (in shares) 458,382 387,222  
Options granted 247,310    
Vested (in shares) (168,050)    
Forfeited (in shares) (8,100)    
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) $ 16.66    
Granted, weighted average fair value at grant date (in dollars per share) 12.55 $ 16.35 $ 17.52
Vested, weighted average fair value at grant date (in dollars per share) 17.05    
Forfeited, weighted average fair value at grant date (in dollars per share) 15.43    
Balance at end of year, weighted average fair value at grant date (in dollars per share) $ 14.32 $ 16.66