Summary of Stock Activity (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) Years $ / shares shares	Dec. 31, 2016 USD ($) Years $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options outstanding | shares	161,310	236,385
Options granted | shares	4,555
Options exercised | shares	(79,630)
Options outstanding weighted average exercise price | $ / shares	$ 25.63	$ 25.35
Options outstanding weighted average exercise price - Granted | $ / shares	37.55
Options outstanding weighted average exercise price - modification | $ / shares	30.21
Options outstanding weighted average exercise price - Exercised | $ / shares	$ 25.48
Options outstanding weighted average remaining term | Years	5.7	6.1
Options outstanding weighted average grant date fair value	$ 1,622	$ 2,440
Options granted weighted average grant date fair value	75
Options modified weighted average grant date fair value	(137)
Options exercised weighted average grant date fair value	$ (756)
Options exercisable at June 30, 2017 | shares	119,020
Options exerciseable weighted average exercise price | $ / shares	$ 23.66
Options exerciseable weighted average remaining term | Years	4.9
Options exerciseable weighted average grant date fair value	$ 1,038
Options vested during six months ended June 30, 2017 | shares	26,839
Options vested weighted average grant date fair value	$ 223