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STOCK PLANS (Non-Vested Stock Option Activity) (Details) - Stock options - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock Plans |  |  |
Balance of Nonvested Options (in shares) | 335,834 | 374,575 |
Options granted (in shares) | 222,589 |  |
Vested (in shares) | (199,026) |  |
Canceled (in shares) | (1,360) |  |
Forfeited (in shares) | (60,944) |  |
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) | $ 17.93 |  |
Granted, weighted average fair value at grant date (in dollars per share) | 15.97 | $ 17.46 | $ 18.97
Vested, weighted average fair value at grant date (in dollars per share) | $ 17.91 |  |
Canceled, weighted average fair value at grant date (in dollars per share) | 15.77 |  |
Forfeited, weighted average fair value at grant date (in dollars per share) | $ 16.69 |  |
Balance at end of year, weighted average fair value at grant date (in dollars per share) | $ 16.88 | $ 17.93 |

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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