STOCK-BASED COMPENSATION - Stock Option Activity (Details) - $ / shares	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options, Outstanding at January 1, 2016	16,500
Options, Granted	0	0	0
Options, Exercised	(12,750)
Options, Forfeited/ Expired	(250)
Options, Cancelled	0
Options, Outstanding at December 31, 2016	3,500	16,500
Options, Vested and expected to vest	3,500
Options, Exercisable at December 31, 2016	3,500
Weighted Average Exercise Price, Outstanding at January 1, 2016	$ 14.83
Weighted Average Exercise Price, Granted	0
Weighted Average Exercise Price, Exercised	14.51
Weighted Average Exercise Price, Forfeited/ Expired	0
Weighted Average Exercise Price, Cancelled	0
Weighted Average Exercise Price, Outstanding at December 31, 2016	15.99	$ 14.83
Weighted Average Exercise Price, Vested and expected to vest	15.99
Weighted Average Exercise Price, Exercisable at December 31, 2016	$ 15.99

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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-Publisher FASB
-Name Accounting Standards Codification
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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Number of share options (or share units) exercised during the current period.

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