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Stock-Based Compensation (Summary of Stock Option Activity) (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Stock Based Compensation [Abstract]    
Options, beginning of year | shares 208,700  
Options, Granted | shares 0  
Options, Exercised | shares (9,300)  
Options, Forfeited | shares 0  
Options, end of year | shares 199,400 208,700
Options, Exercisable, end of period | shares 170,500  
Weighted Average Exercise Price Per Share, Outstanding, beginning of period | $ / shares $ 22.54  
Weighted Average Exercise Price Per Share, Granted | $ / shares  
Weighted Average Exercise Price Per Share, Exercised | $ / shares 18.31  
Weighted Average Exercise Price Per Share, Forfeited | $ / shares 0.00  
Weighted Average Exercise Price Per Share, Outstanding, end of period | $ / shares 22.74 $ 22.54
Weighted Average Exercise Price Per Share, Exercisable, end of period | $ / shares $ 21.11  
Weighted Average Remaining Contractual Term, Outstanding 5 years 6 months 5 years 10 months 24 days
Weighted Average Remaining Contractual Term, Exercised During Period 4 years 1 month 6 days  
Weighted Average Remaining Contractual Term, Exercisable at End of Period 4 years 9 months 18 days  
Aggregate Intrinsic Value, Outstanding, beginning of period | $ $ 2,183  
Aggregate Intrinsic Value, Granted in Period | $ 0  
Aggregate Intrinsic Value, Exercised in Period | $ 119  
Aggregate Intrinsic Value, Forfeited in Period | $ 0  
Aggregate Intrinsic Value, Outstanding, end of period | $ 2,407 $ 2,183
Aggregate Intrinsic Value, Exercisable at end of period | $ $ 2,335