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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, 2016
Dec. 31, 2015
Dec. 31, 2014
STOCK-BASED COMPENSATION PLANS      
Shares of common stock available for grant under stock incentive plans 727,107    
Restricted Stock      
STOCK-BASED COMPENSATION PLANS      
Weighted average grant date fair value (in dollars per share) $ 19.99 $ 27.37 $ 11.26
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) 367,199 487,678 520,195
Awarded (in shares) 105,662 76,714 168,334
Forfeited (in shares) (5,912) (7,066) (42,141)
Vested (in shares) (158,407) (190,127) (158,710)
Outstanding at end of period (in shares) 308,542 367,199 487,678
Additional disclosures      
Compensation expense, net of forfeitures $ 1,893 $ 1,744 $ 1,541
Unrecognized compensation expense 2,573    
Unrecognized compensation expense, expected to be recognized in next fiscal year $ 1,326    
Restricted Stock | Minimum      
STOCK-BASED COMPENSATION PLANS      
Service period of earned grants 3 years    
Restricted Stock | Maximum      
STOCK-BASED COMPENSATION PLANS      
Service period of earned grants 5 years    
Restricted Stock | Performance based vesting      
Number of Nonvested Restricted Shares      
Outstanding at beginning of period (in shares) 29,188 5,892 15,190
Awarded (in shares) 60,153 41,792 88,566
Performance criteria met (in shares) (38,167) (14,200) (92,583)
Forfeited (in shares) (6,302) (4,296) (5,281)
Outstanding at end of period (in shares) 44,872 29,188 5,892