Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 7,197	$ 7,337	$ 8,791	$ 7,956
Basic-weighted average shares outstanding (in shares)	27,924	27,818	27,915	27,785
Effect of dilutive potential securities (in shares)	259	133	209	161
Diluted- weighted average shares outstanding (in shares)	28,183	27,951	28,124	27,946
Basic (in dollars per share)	$ 0.26	$ 0.26	$ 0.31	$ 0.29
Diluted (in dollars per share)	$ 0.26	$ 0.26	$ 0.31	$ 0.28
Antidilutive securities excluded from computation of earnings per share (in shares)	1,300	1,600	1,200	1,400