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STOCK PLANS (Non-Vested Stock Option Activity) (Details) - Stock options - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stock Plans |  |  |
Balance of Nonvested Options (in shares) | 387,222 | 268,975 |
Options granted | 323,130 | 5,121 | 273,105
Vested (in shares) | (189,681) |  |
Forfeited (in shares) | (15,202) |  |
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) | $ 17.48 |  |
Granted, weighted average fair value at grant date (in dollars per share) | 16.35 | $ 17.52 | $ 18.14
Vested, weighted average fair value at grant date (in dollars per share) | 17.26 |  |
Forfeited, weighted average fair value at grant date (in dollars per share) | 17.15 |  |
Balance at end of year, weighted average fair value at grant date (in dollars per share) | $ 16.66 | $ 17.48 |

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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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