Summary of Stock Activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Years $ / shares shares	Dec. 31, 2016 USD ($) Years $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options outstanding | shares	222,379	236,385
Options granted | shares	4,555
Options exercised | shares	(18,561)
Options outstanding weighted average exercise price | $ / shares	$ 26.00	$ 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	$ 20.48
Options outstanding weighted average remaining term | Years	6.2	6.1
Options outstanding weighted average grant date fair value	$ 2,215	$ 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	$ (163)
Options exercisable at March 31, 2017 | shares	180,089
Options exerciseable weighted average exercise price | $ / shares	$ 24.79
Options exerciseable weighted average remaining term | Years	5.7
Options exerciseable weighted average grant date fair value	$ 1,631
Options vested during three months ended March 31, 2017 | shares	26,839
Options vested weighted average grant date fair value	$ 223