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Stock-Based Compensation Plan - Options (Details) - Stock option - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Additional disclosures      
Compensation cost $ 166,000 $ 205,000  
Total income tax benefits related to stock options exercised $ 125,000 $ 76,000  
Amended and Restated 2008 Option Plan      
Shares      
Outstanding at the beginning of the year (in shares) 1,727,945    
Granted (in shares) 0 0  
Exercised (in shares) (128,608)    
Forfeited or expired (in shares) (760)    
Outstanding at the end of the year (in shares)     1,727,945
Exercisable at the end of the year (in shares) 1,598,577    
Weighted-Average Exercise Price      
Outstanding at the beginning of the year (in dollars per share) $ 8.14    
Exercised (in dollars per share) 6.40    
Forfeited or expired (in dollars per share) 10.76    
Outstanding at the end of the year (in dollars per share)     $ 8.14
Exercisable at the end of the year (in dollars per share) $ 8.28    
Additional disclosures      
Outstanding Weighted-Average Remaining Contractual Term (in years)     3 years 2 months 1 day
Exercisable Weighted-Average Remaining Contractual Term (in years) 3 years 1 month 28 days    
Exercisable Aggregate Intrinsic Value $ 13,125,999