STOCK PLANS (Non-Vested Stock Option Activity) (Details) - Stock options - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock Plans
Balance of Nonvested Options (in shares)	360,444	409,559
Options granted	171,843
Vested (in shares)	(220,958)
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)	$ 15.47
Granted, weighted average fair value at grant date (in dollars per share)	18.97	$ 17.50	$ 12.55
Vested, weighted average fair value at grant date (in dollars per share)	15.75
Balance at end of year, weighted average fair value at grant date (in dollars per share)	$ 17.21	$ 15.47