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SHARE-BASED COMPENSATION PLANS - Schedule of Restricted Shares Compensation Expense (Details) - 2011 Incentive Stock Plan - Restricted stock awards - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share award expense $ 1,369 $ 941 $ 732
Restricted share award tax benefit 465 320 256
Fair value of shares vested $ 303 $ 237 $ 43