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STOCK PLANS (Summary Non-Vested Restricted Stock Activity) (Details) - Restricted stock awards
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Shares  
Balance at beginning of year (in shares) | shares 44,629
Shares granted | shares 13,470
Shares vested (in shares) | shares (11,940)
Shares forfeited | shares 0
Balance at end of year (in shares) | shares 46,159
Weighted Average Grant Date Fair Value  
Balance at beginning of year, weighted average grant date fair value (in dollars per share) | $ / shares $ 61.84
Shares granted, weighted average grant date fair value (in dollars per share) | $ / shares 79.43
Shares vested, weighted average grant date fair value (in dollars per share) | $ / shares 70.80
Shares forfeited, weighted average grant date fair value (in dollars per share) | $ / shares 0.00
Balance at end of year, weighted average grant date fair value (in dollars per share) | $ / shares $ 64.65