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Equity Incentive Plans (Summary of Stock Option Activity) (Details) - $ / shares
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Equity Incentive Plans [Abstract]          
Outstanding, Beginning Balance - Number of Options   1,192,348 1,200,975 1,200,975  
Options Granted - Number of Options   72,800    
Options Exercised - Number of Options (31,000) (67,623) (500)    
Options Forfeited - Number of Options     (8,127)    
Options Expired - Number of Options        
Outstanding, Ending Balance - Number of Options 1,197,525 1,197,525 1,192,348 1,192,348 1,200,975
Outstanding, Range of Exercise Price, Lower Range Limit (per share)   $ 9.03 $ 8.93 $ 8.93 $ 8.93
Outstanding, Range of Exercise Price, Upper Range Limit (per share)   13.68 13.32 13.32 13.32
Options Shares Forfeited - Range of Exercise Prices, Lower Range Limit     11.26    
Options Shares Forfeited - Range of Exercise Prices, Upper Range Limit     12.46    
Options Exercised - Exercise Price     10.55    
Options Shares Granted, Range of Exercise Prices, Lower Range Limit   12.89      
Options Shares Granted, Range of Exercise Prices, Upper Range Limit   13.68      
Option Shares Exercised - Range of Exercise Prices, Lower Range Limit   8.93      
Option Shares Exercised - Range of Exercise Prices, Upper Range Limit   12.46      
Outstanding Number of Options, Beginning Balance - Weighted Average Exercise Price   11.45 11.45 11.45  
Number of Options Granted - Weighted Average Exercise Price   12.96      
Number of Options, Exercised - Weighted Average Exercise Price   9.83 10.55    
Number of Options Forfeited - Weighted Average Exercise Price     11.68    
Outstanding Number of Options, Ending Balance - Weighted Average Exercise Price $ 11.64 $ 11.64 $ 11.45 $ 11.45 $ 11.45