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Stock-Based Compensation (Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity) (Details) - Restricted Stock [Member]
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning period, nonvested number of shares | shares 32,809 47,881
Number of shares, granted | shares 10,662 6,752
Number of shares, vested | shares (17,607) (21,738)
Number of shares, cancelled | shares (391) (86)
Ending period, nonvested number of shares | shares 25,473 32,809
Beginning period, weighted average grant date fair value, nonvested number of shares | $ / shares $ 22.61 $ 20.41
Weighted average grant date fair value, granted | $ / shares 36.43 30.20
Weighted average grant date fair value, vested | $ / shares $ 21.85 $ 20.13
Weighted average grant date fair value, cancelled | $ / shares 27.69 20.75
Ending period, weighted average grant date fair value, nonvested number of shares | $ / shares $ 28.76 $ 22.61