Summary of Stock Activity (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) Years $ / shares shares	Dec. 31, 2018 USD ($) Years $ / shares shares
Share-based Payment Arrangement [Abstract]
Options outstanding | shares	142,734	147,538
Options granted | shares	0
Options exercised | shares	(4,804)
Options outstanding weighted average exercise price | $ / shares	$ 33.59	$ 33.48
Options outstanding weighted average exercise price - Granted | $ / shares	0
Options outstanding weighted average exercise price - Exercised | $ / shares	$ 30.04
Options outstanding weighted average remaining term | Years	6.2	6.7
Options outstanding weighted average grant date fair value | $	$ 1,729	$ 1,782
Options granted weighted average grant date fair value | $	0
Options exercised weighted average grant date fair value | $	$ (53)
Options exercisable at June 30, 2019 | shares	114,910
Options exerciseable weighted average exercise price | $ / shares	$ 31.65
Options exerciseable weighted average remaining term | Years	5.7
Options vested weighted average grant date fair value | $	$ 0
Options vested during six months ended June 30, 2019 | shares	0
Options exercisable weighted average grant date fair value | $	$ 1,293