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STOCK BASED COMPENSATION PLANS - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Intrinsic value of options exercised $ 98 $ 760 $ 708
Unrecognized compensation cost $ 549    
Unrecognized compensation cost, expense recognition period 1 year 7 months 24 days    
ISOP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized for issuance 1,012,500    
Term of plan 10 years    
ISOP | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
ISOP | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 7 years    
2015 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized for issuance 420,000    
Stock award granted to one individual, maximum 30,000    
2019 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized for issuance 500,000    
Term of plan 10 years    
Shares available for grant under this plan 467,616    
Long Term Incentive Program      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Term of plan 3 years    
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 14    
Unrecognized compensation cost, expense recognition period 6 months 22 days    
Stock options | Weighted Average      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost, expense recognition period 6 years    
Stock options and restricted stock awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Tax benefit recognized from compensation expense $ 78 81 308
Restricted stock units and performance stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Tax benefit recognized from compensation expense $ 244 $ 221 423
Performance stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair market value on granted shares (usd per share) $ 23.24 $ 26.30  
Performance period required 3 years 3 years  
Intrinsic value of stock units vested and exercised $ 376 $ 337 285
Performance stock units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized for issuance 0 0  
Performance stock units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized for issuance 26,952 19,973  
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Fair market value on granted shares (usd per share) $ 22.45 $ 28.66  
Intrinsic value of stock units vested and exercised $ 493 $ 594 $ 272
Restricted stock units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair market value on granted shares (usd per share) $ 22.07 $ 24.85  
Restricted stock units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair market value on granted shares (usd per share) $ 24.67 $ 30.19