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STOCK-BASED COMPENSATION Restricted stock units (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted, number of share of restricted stock (units) 0 50,834
Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Non-vested restricted stock (units) at January 1, weighted average grant date fair value $ 15.12 $ 15.68
Granted, weighted average grant date fair value 9.49 14.92
Vested, weighted average grant date fair value 11.43 14.87
Forfeitures, Weighted Average Grant Date Fair Value 15.20 15.38
Non-vested restricted stock (units) at December 31, weighted average grant date fair value $ 15.45 $ 15.12
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Shares Earned Above Target [1] 0 723
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares Earned Above Target, Weighted Average Grant Date Fair Value [1] $ 0 $ 17.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Unvested restricted stock (units) at January 1, number of shares of restricted stock (unit) 63,436 57,773
Granted, number of share of restricted stock (units) 46,697 88,906
Vested, number of share of restricted stock (units) (73,073) (68,876)
Forfeited, number of share of restricted stock (units) (22,384) (15,090)
Unvested restricted stock (units) at December 31, number of shares of restricted stock (unit) 14,676 63,436
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 685 $ 1,016
[1] The number of shares earned above target are based on the performance target established by the Compensation Committee at the initial grant date.