Share-Based Compensation (Schedule of Transactions under Stock Plans) (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) $ / shares shares
Number of Shares
Number of shares outstanding, beginning of period (in shares) | shares	142,005
Number of shares granted (in shares) | shares	10,450
Number of shares exercised (in shares) | shares	(9,307)
Number of shares outstanding, end of period (in shares) | shares	143,148
Number of shares exercisable, end of period (in shares) | shares	124,132
Weighted Average Exercise Price (in dollars per share)
Weighted average exercise price outstanding, beginning of period (in dollars per share) | $ / shares	$ 7.86
Weighted average exercise price granted (in dollars per share) | $ / shares	18.30
Weighted average exercise price exercised (in dollars per share) | $ / shares	7.01
Weighted average exercise price outstanding, end of period (in dollars per share) | $ / shares	8.68
Weighted average exercise price exercisable, end of period (in dollars per share) | $ / shares	$ 7.48
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual term outstanding (in years), end of period	4 years 7 months 6 days
Weighted average remaining contractual term exercisable (in years), end of period	3 years 9 months 18 days
Aggregate intrinsic value outstanding, end of period | $	$ 2,015
Aggregate intrinsic value exercisable, end of period | $	$ 1,895