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STOCK COMPENSATION - Summary of Stock Option (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Options  
Beginning balance (in shares) | shares 1,286,900
Grants (in shares) | shares 48,000
Exercises (in shares) | shares (166,400)
Expirations (in shares) | shares (2,400)
Ending balance (in shares) | shares 1,166,100
Options exercisable, end of period (in shares) | shares 867,807
Weighted- average exercise price  
Beginning balance (usd per share) | $ / shares $ 13.28
Grants (usd per share) | $ / shares 14.18
Exercises (usd per share) | $ / shares 11.68
Expirations (usd per share) | $ / shares 19.10
Ending balance (usd per share) | $ / shares 13.54
Weighted-average exercise price, Options exercisable, end of period (usd per share) | $ / shares $ 14.72
Weighted- average remaining contractual life (years)  
Options outstanding, end of period 5 years 4 months 24 days
Options exercisable, end of period 4 years 3 months 18 days
Aggregate intrinsic value (in thousands)  
Options outstanding, aggregate intrinsic Value | $ $ 2,666
Options exercisable, aggregate intrinsic Value | $ 1,269
Total unrecognized stock option expense remaining (in thousands) | $ $ 762
Weighted-average years expected to be recognized over (in years) 1 year 8 months 12 days