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EARNINGS PER COMMON SHARE - Additional Information (Details) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted Stock Units      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Stock excluded from computation of earnings per share 145,349 0 0
Stock Option      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Stock excluded from computation of earnings per share 59,178 272,878 498,196