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STOCK-BASED COMPENSATION PLANS - Summary of Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Number of Stock Options Outstanding
Beginning balance (in shares)	169,921	236,763
Granted (in shares)	0	0
Exercised (in shares)	(47,534)	(55,725)
Forfeited (in shares)	(750)	(11,117)
Ending balance (in shares)	121,637	169,921
Ending vested and expected to vest (in shares)	121,637	169,921
Exercisable, outstanding (in shares)	101,554	100,317
Weighted Average Exercise Price
Beginning balance (usd per share)	$ 18.95	$ 17.99
Granted (usd per share)	0.00	0.00
Exercised (usd per share)	16.32	15.19
Forfeited (usd per share)	22.16	17.38
Ending balance (usd per share)	19.96	18.95
Ending vested and expected to vest (usd per share)	19.96	18.95
Exercisable (usd per share)	$ 20.66	$ 18.66
Aggregate Intrinsic Value
Value of ending outstanding balance	$ 313	$ 1,370
Ending vested and expected to vest	313	1,370
Exercisable, aggregate intrinsic value	$ 192	$ 838

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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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