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Stock-Based Compensation - Stock Options Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Options      
Outstanding, beginning balance (in shares) 159,372    
Granted (in shares) 24,208 23,218 14,755
Exercised (in shares) 1,166    
Forfeited/Expired, (in shares) 1,112    
Outstanding, ending balance (in shares) 181,302 159,372  
Vested and Exercisable, ending balance (in shares) 122,058    
Weighted Average Exercise Price Per Share      
Outstanding, beginning balance (in usd per share) $ 23.45    
Granted (in usd per share) 28.22    
Exercised (in usd per share) 20.19    
Forfeited/Expired (in usd per share) 29.51    
Outstanding, ending balance (in usd per share) 24.07 $ 23.45  
Vested and Exercisable, ending balance (in shares) $ 21.30    
Weighted Average Remaining Life in Years      
Outstanding Options (in years) 5 years 3 months 18 days 5 years 9 months 18 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 3 months 18 days 5 years 9 months 18 days  
Vested and Exercisable, ending balance (in years) 3 years 10 months 24 days    
Aggregate Intrinsic Value      
Outstanding, beginning balance $ 1,667    
Outstanding, ending balance 627 $ 1,667  
Vested and Exercisable, ending balance (in shares) $ 627