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Shareholders' Equity (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class Of Stock [Line Items]        
Stock Repurchased During Period, Shares 98,603      
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 380,551      
Share-based Compensation Arrangement by Share-based Payment Award, Options outstanding 458,000 453,000 455,000 467,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 1 month 6 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5 years 1 month 6 days      
Stock Issued During Period Shares Stock Option Exercised 83,000 77,000 70,000  
Stock Issued During Period, Value, Stock Options Exercised $ 1,088 $ 1,131 $ 764  
Pre-tax charge 491 373 476  
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 81 $ 67 $ 141  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 314      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 3 years 3 months 18 days      
Stock Options [Member]        
Class Of Stock [Line Items]        
Shares of common stock were not considered in computing diluted earnings per common share 243,657 157,532 90,000  
2007 Stock Option Plan [Member]        
Class Of Stock [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options outstanding 376,220      
Percentage of Share Based Compensation Arrangement by Share Based Payment Award Options Exercise Price to Fair Market Value 100.00%      
2017 Plan [Member]        
Class Of Stock [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 850,000      
Number of shares remained available for grant   672,600    
Percentage of Share Based Compensation Arrangement by Share Based Payment Award Options Exercise Price to Fair Market Value 100.00%      
Stock Issued During Period Shares Stock Option Exercised 83,261      
Stock Issued During Period, Value, Stock Options Exercised $ 1,088      
Deferred Tax Expense from Stock Options Exercised $ 278