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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, 2019
Dec. 31, 2018
Dec. 31, 2017
STOCK-BASED COMPENSATION      
Shares of common stock available for grant under stock incentive plans 911,178    
Restricted Stock      
STOCK-BASED COMPENSATION      
Weighted average grant date fair value (in dollars per share) $ 41.95 $ 35.89 $ 22.56
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) 155,742 221,968 308,542
Awarded (in shares) 109,530 64,656 105,785
Forfeited (in shares) (3,166) (18,867) (17,676)
Vested (in shares) (75,404) (112,015) (174,683)
Outstanding at end of period (in shares) 186,702 155,742 221,968
Additional disclosures      
Compensation expense, net of forfeitures $ 3,203 $ 2,643 $ 2,026
Unrecognized compensation expense 4,151    
Unrecognized compensation expense, expected to be recognized in next fiscal year $ 2,302    
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)   37,782 44,872
Awarded (in shares) 76,877 30,603 28,025
Performance criteria met (in shares) (50,852) (66,525) (7,670)
Forfeited (in shares) (549) (1,860) (27,445)
Outstanding at end of period (in shares) 25,476   37,782