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SHARE-BASED COMPENSATION PLANS - Schedule of Employee Stock Purchase Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Shares purchased (in shares)     0 56,885
Employee Stock Purchase Plan        
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Shares purchased (in shares) 2,951 3,518 5,907 6,632
Weighted average price of shares purchased (in usd per share) $ 22.61 $ 21.33 $ 23.04 $ 20.57
Compensation expense recognized $ 10 $ 11 $ 14 $ 17
Tax benefits $ 2 $ 4 $ 3 $ 6