STOCK PLANS (Summary Non-Vested Restricted Stock Activity) (Details) (Restricted stock awards, USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restricted stock awards
Shares
Balance at beginning of year (in shares)	355,933
Shares granted (in shares)	20,099	22,779	112,864
Shares vested (in shares)	(57,944)
Shares forfeited (in shares)	0	(7,434)	0
Balance at end of year (in shares)	318,088	355,933
Weighted Average Grant Date Fair Value
Balance at beginning of year, weighted average grant date fair value (in dollars per share)	$ 28.18
Shares granted, weighted average grant date fair value (in dollars per share)	$ 47.81	$ 35.55	$ 31.05
Shares vested, weighted average grant date fair value (in dollars per share)	$ 31.93
Shares forfeited, weighted average grant date fair value (in dollars per share)	$ 0.00	$ 24.67	$ 0.00
Balance at end of year, weighted average grant date fair value (in dollars per share)	$ 28.74	$ 28.18