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Stock-Based Compensation Plans Options Activity (Details) - Stock Options - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock Options      
Outstanding and exercisable as of December 31, 2019 500,260    
Exercised (89,725)    
Forfeited (1,047)    
Expired (11,181)    
Outstanding and exercisable as of December 31, 2020 398,307 500,260  
Weighted Average Exercise Price      
Outstanding as of December 31, 2019 (usd per share) $ 11.12    
Exercised (usd per share) 9.99    
Forfeited (usd per share) 12.25    
Expired (usd per share) 10.27    
Outstanding as of December 31, 2020 (usd per share) $ 11.39 $ 11.12  
Weighted Average Remaining Contractual Term, Outstanding 1 year 10 months 24 days    
Additional Disclosures [Abstract]      
Outstanding, Aggregate Intrinsic Value $ 500,000    
Number of options exercised 89,725 $ 150,296 $ 214,845
Total intrinsic value of options exercised 192,000 1,028,000 1,616,000
Cash received from options exercised 880,000 1,446,000 2,210,000
Tax benefit from options exercised $ 37,000 $ 188,000 $ 291,000