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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, 2020
Dec. 31, 2019
Dec. 31, 2018
STOCK-BASED COMPENSATION      
Shares of common stock available for grant under stock incentive plans 753,187    
Restricted Stock      
STOCK-BASED COMPENSATION      
Weighted average grant date fair value (in dollars per share) $ 33.51 $ 41.95 $ 35.89
Service period over which value of the shares is amortized to compensation expense 3 years    
Number of Non-vested Restricted Shares      
Outstanding at beginning of period (in shares) 186,702 155,742 221,968
Awarded (in shares) 160,437 109,530 64,656
Forfeited (in shares) (2,446) (3,166) (18,867)
Vested (in shares) (106,465) (75,404) (112,015)
Outstanding at end of period (in shares) 238,228 186,702 155,742
Additional disclosures      
Stock based compensation expense, net of forfeitures $ 3,550 $ 3,203 $ 2,643
Unrecognized compensation expense 4,100    
Unrecognized compensation expense, expected to be recognized in next fiscal year $ 2,236    
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 Non-vested Restricted Shares      
Outstanding at beginning of period (in shares) 25,476   37,782
Awarded (in shares) 100,403 76,877 30,603
Performance criteria met (in shares) (64,384) (50,852) (66,525)
Forfeited (in shares) (2,155) (549) (1,860)
Outstanding at end of period (in shares) 59,340 25,476