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STOCK PLANS (Non-Vested Stock Option Activity) (Details) - Stock options - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock Plans |  |  |
Balance of Nonvested Options (in shares) | 374,575 | 360,444 |
Options granted | 201,881 |  |
Vested (in shares) | (187,750) |  |
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) | $ 17.21 |  |
Granted, weighted average fair value at grant date (in dollars per share) | 17.46 | $ 18.97 | $ 17.50
Vested, weighted average fair value at grant date (in dollars per share) | 16.04 |  |
Balance at end of year, weighted average fair value at grant date (in dollars per share) | $ 17.93 | $ 17.21 |

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