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STOCK BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) 3,200,000    
Share-based compensation expense $ 3,400 $ 3,100 $ 1,700
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) 1,800,000    
Option, cumulative options granted since inception (in shares) 1,309,231    
Stock options granted 0 0  
Expiration period 10 years    
Award vesting period 4 years    
Unrecognized compensation cost $ 110    
Weighted average period over which unrecognized compensation 6 months 10 days    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 4,300    
Weighted average period over which unrecognized compensation 2 years 3 months 10 days    
Share awards granted (in shares) 64,000 88,000  
Share awards granted (in dollars per share) $ 22.59 $ 34.97  
Restricted Stock | Share Award Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option, cumulative options granted since inception (in shares) 378,091    
Award vesting period 4 years    
Share awards granted (in shares) 63,596 87,950  
Share awards granted (in dollars per share) $ 22.59 $ 34.97  
Award vested in period, fair value $ 2,000 $ 1,600 $ 621
Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 2 years    
Weighted average period over which unrecognized compensation 1 year 10 months 17 days    
Share awards granted (in shares) 46,243 34,628  
Service period 1 year    
Unrecognized compensation expense $ 1,200