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SHARE-BASED COMPENSATION PLANS - Schedule of Employee Stock Purchase Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Shares purchased (in shares)     0 53,367
Employee Stock Purchase Plan        
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Shares purchased (in shares) 0 0 2,956 3,114
Weighted average price of shares purchased (in usd per share) $ 0.00 $ 0.00 $ 23.47 $ 19.71
Compensation expense recognized $ 0 $ 0 $ 4 $ 7
Tax benefits $ 0 $ 0 $ 1 $ 2