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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Shares purchased     56,885 15,334
Employee Stock Purchase Plan        
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Shares purchased 3,518 3,873 6,632 6,334
Weighted average price of shares purchased (in usd per share) $ 21.33 $ 16.68 $ 20.57 $ 16.64
Compensation expense recognized $ 11 $ 14 $ 17 $ 17