STOCK PLANS (Non-Vested Stock Option Activity) (Details) (Stock options, USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock options
Stock Plans
Balance of Nonvested Options (in shares)	268,975	615,634
Granted (in shares)	5,121	273,105	412,980
Vested (in shares)	(326,596)
Forfeited (in shares)	(25,184)
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)	$ 16.32
Granted, weighted average fair value at grant date (in dollars per share)	$ 17.52	$ 18.14	$ 15.87
Vested, weighted average fair value at grant date (in dollars per share)	$ 15.63
Forfeited, weighted average fair value at grant date (in dollars per share)	$ 13.17
Balance at end of year, weighted average fair value at grant date (in dollars per share)	$ 17.48	$ 16.32