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STOCK-BASED COMPENSATION PLANS (Details 2) - Non Vested Stock Options [Member] - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Outstanding at beginning of year	724,125	756,920	751,582
Number of Options, Granted	211,200	277,800	299,700
Number of Options, Vested	(296,638)	(293,720)	(275,187)
Number of Options, Forfeited	(13,325)	(16,875)	(19,175)
Number of Options, Outstanding at end of year	625,362	724,125	756,920
Weighted Average Exercise Price, Outstanding at beginning of year (in dollars per share)	$ 26.2	$ 26.53	$ 26.74
Weighted Average Exercise Price, Granted (in dollars per share)	27.94	25.51	25.64
Weighted Average Exercise Price, Vested (in dollars per share)	26.71	26.39	26.14
Weighted Average Exercise Price, Forfeited (in dollars per share)	26.16	26.37	26.59
Weighted Average Exercise Price, Outstanding at end of year (in dollars per share)	26.55	26.2	26.53
Weighted Average Fair Value, Outstanding at beginning of year (in dollars per share)	3.07	3.1	3.12
Weighted Average Fair Value, Granted (in dollars per share)	4.05	3.05	3.3
Weighted Average Fair Value, Vested (in dollars per share)	3.01	3.13	3.36
Weighted Average Fair Value, Forfeited (in dollars per share)	3.12	3.1	3.14
Weighted Average Fair Value, Outstanding at end of the year (in dollars per share)	$ 3.43	$ 3.07	$ 3.1

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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=96867065&loc=d3e5070-113901

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the non-vested stock option plan.

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