STOCK PLANS (Summary Non-Vested Restricted Stock Activity) (Details) - Restricted stock awards	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Shares
Balance at beginning of year (in shares) | shares	47,856
Shares granted | shares	1,662
Shares vested (in shares) | shares	(32,922)
Shares forfeited | shares	(4,158)
Balance at end of year (in shares) | shares	12,438
Weighted Average Grant Date Fair Value
Balance at beginning of year, weighted average grant date fair value (in dollars per share) | $ / shares	$ 71.54
Shares granted, weighted average grant date fair value (in dollars per share) | $ / shares	91.02
Shares vested, weighted average grant date fair value (in dollars per share) | $ / shares	82.48
Shares forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	78.65
Balance at end of year, weighted average grant date fair value (in dollars per share) | $ / shares	$ 80.98