STOCK PLANS (Non-Vested Stock Option Activity) (Details) - Stock options - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock Plans
Balance of Nonvested Options (in shares)	341,253	335,835
Options granted (in shares)	179,184
Vested (in shares)	(170,494)
Canceled (in shares)	(2,642)
Forfeited (in shares)	(630)
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)	$ 16.88
Granted, weighted average fair value at grant date (in dollars per share)	21.70	$ 15.97	$ 17.46
Vested, weighted average fair value at grant date (in dollars per share)	$ 17.50
Canceled, weighted average fair value at grant date (in dollars per share)	16.12
Forfeited, weighted average fair value at grant date (in dollars per share)	$ 15.56
Balance at end of year, weighted average fair value at grant date (in dollars per share)	$ 19.11	$ 16.88