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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, 2017
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning period, nonvested number of shares | shares 47,881 37,048
Number of shares, granted | shares 6,752 27,403
Number of shares, vested | shares (21,738) (15,912)
Number of shares, cancelled | shares (86) (658)
Ending period, nonvested number of shares | shares 32,809 47,881
Beginning period, weighted average grant date fair value, nonvested number of shares | $ / shares $ 20.41 $ 19.83
Weighted average grant date fair value, granted | $ / shares 30.20 21.00
Weighted average grant date fair value, vested | $ / shares $ 20.13 $ 20.09
Weighted average grant date fair value, cancelled | $ / shares 20.75 20.31
Ending period, weighted average grant date fair value, nonvested number of shares | $ / shares $ 22.61 $ 20.41