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Stock Based Compensation (Schedule Of Share-based Compensation, Stock Options, Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for fututre grants 293,090    
ESPP [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Balance Outstanding 19,111 18,378  
Granted 32,209 19,644  
Exercised (753) (2,270)  
Expired (20,882) (16,641)  
Balance Outstanding 29,685 19,111  
Weighted Average Price Per Share: Balance Outstanding $ 36.21 $ 32.73  
Weighted Average Price Per Share: Granted 24.19 36.21  
Weighted Average Price Per Share: Exercised 25.32 32.75  
Weighted Average Price Per Share: Expired 35.15 32.84  
Weighted Average Price Per Share: Balance Outstanding $ 24.19 $ 36.21  
Aggregate Intrinsic Value $ 84 $ 47  
Number of shares available for fututre grants 181,954    
ISOP [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Balance Outstanding 92,979 104,011  
Granted  
Exercised (625) (8,482)  
Forfeited (2,550)  
Balance Outstanding 92,354 92,979  
Weighted Average Price Per Share: Balance Outstanding $ 28.55 $ 28.22  
Weighted Average Price Per Share: Granted  
Weighted Average Price Per Share: Exercised   22.82  
Weighted Average Price Per Share: Expired 27.62    
Weighted Average Price Per Share: Forfeited 34.10  
Weighted Average Price Per Share: Balance Outstanding $ 28.55 $ 28.55  
Aggregate Intrinsic Value   $ 943 $ 341
Restricted Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Balance Outstanding    
Granted 14,921    
Vested (398)    
Forfeited (990)    
Balance Outstanding 13,533  
Weighted Average Price Per Share: Balance Outstanding    
Weighted Average Price Per Share: Granted 31.02    
Weighted Average Price Per Share: Vested 31.02    
Weighted Average Price Per Share: Forfeited 31.02    
Weighted Average Price Per Share: Balance Outstanding $ 31.02