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Stock-Based Compensation (Summary of Stock Option Activity) (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Stock-Based Compensation [Abstract]    
Options, beginning of year | shares 215,970  
Options, Granted | shares 2,000  
Options, Exercised | shares (9,620)  
Options, Forfeited | shares (8,250)  
Options, end of year | shares 200,100 215,970
Options, Exercisable, end of period | shares 164,350  
Weighted Average Exercise Price Per Share, Outstanding, beginning of period | $ / shares $ 25.73  
Weighted Average Exercise Price Per Share, Granted | $ / shares 25.87  
Weighted Average Exercise Price Per Share, Exercised | $ / shares 18.85  
Weighted Average Exercise Price Per Share, Forfeited | $ / shares 33.72  
Weighted Average Exercise Price Per Share, Outstanding, end of period | $ / shares 25.73 $ 25.73
Weighted Average Exercise Price Per Share, Exercisable, end of period | $ / shares $ 25.48  
Weighted Average Remaining Contractual Term, Outstanding 5 years 4 months 24 days 6 years
Weighted Average Remaining Contractual Term, Granted in Period 9 years 4 months 24 days  
Weighted Average Remaining Contractual Term, Exercised During Period 2 years 4 months 24 days  
Weighted Average Remaining Contractual Term, Forfeited During Period 7 years 3 months 18 days  
Weighted Average Remaining Contractual Term, Exercisable at End of Period 4 years 7 months 6 days  
Aggregate Intrinsic Value, Outstanding, beginning of period | $ $ 743  
Aggregate Intrinsic Value, Outstanding, end of period | $ 612 $ 743
Aggregate Intrinsic Value, Exercisable at end of period | $ $ 612