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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 |

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