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STOCK-BASED COMPENSATION PLANS - Stock Incentive Plans and Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
STOCK-BASED COMPENSATION      
Shares of common stock available for grant under stock incentive plans 1,081,911    
Restricted Stock      
STOCK-BASED COMPENSATION      
Weighted average grant date fair value (in dollars per share) $ 22.56 $ 19.99 $ 27.37
Service period over which value of the shares is amortized to compensation expense 3 years    
Number of Nonvested Restricted Shares      
Outstanding at beginning of period (in shares) 308,542 367,199 487,678
Awarded (in shares) 105,785 105,662 76,714
Forfeited (in shares) (17,676) (5,912) (7,066)
Vested (in shares) (174,683) (158,407) (190,127)
Outstanding at end of period (in shares) 221,968 308,542 367,199
Additional disclosures      
Compensation expense, net of forfeitures $ 2,026 $ 1,893 $ 1,744
Unrecognized compensation expense 2,704    
Unrecognized compensation expense, expected to be recognized in next fiscal year $ 1,692    
Restricted Stock | Minimum      
STOCK-BASED COMPENSATION      
Service period of earned grants 3 years    
Restricted Stock | Maximum      
STOCK-BASED COMPENSATION      
Service period of earned grants 5 years    
Restricted Stock | Performance based vesting      
Number of Nonvested Restricted Shares      
Outstanding at beginning of period (in shares) 44,872 29,188 5,892
Awarded (in shares) 28,025 60,153 41,792
Performance criteria met (in shares) (7,670) (38,167) (14,200)
Forfeited (in shares) (27,445) (6,302) (4,296)
Outstanding at end of period (in shares) 37,782 44,872 29,188