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SHARE-BASED COMPENSATION PLANS - Schedule of Employee Stock Purchase Plan Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]    
Shares purchased 0 53,367
Employee Stock Purchase Plan    
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]    
Shares purchased 2,956 3,114
Weighted average price of shares purchased (in usd per share) $ 23.47 $ 19.71
Compensation expense recognized $ 4 $ 7
Tax benefits $ 1 $ 2