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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Shares purchased     53,367 2,461
Employee Stock Purchase Plan        
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Shares purchased 0 0 3,114 2,461
Weighted average price of shares purchased (in usd per share) $ 0.00 $ 0.00 $ 19.71 $ 16.57
Compensation expense recognized $ 0 $ 0 $ 7 $ 3