Stock Based Compensation Roll Forward Schedule of Stock Option Plan by Shares and Weighted Average Exercise Prices (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Roll Forward of Shares Outstanding [Roll Forward]
Outstanding, Beginning Balance, in shares	409,471
Granted, in shares	55,590	75,518	10,404
Exercised, in shares	(43,589)
Forfeited, in shares	(11,990)
Outstanding, Ending Balance, in shares	409,482	409,471
Exercisable at December 31, 2014, in shares	275,401
Vested and Expected to Vest, in shares	134,081
Roll Forward of Shares Outstanding - Weighted Average Exercise Price: [Roll Forward]
Outstanding, Beginning Balance, in Weighted Average Exercise Price,	$ 22.04
Granted, in Weighted Average Exercise Price	25.35
Exercised, in Weighted Average Exercise Price	21.04
Forfeited, in Weighted Average Exercise Price	23.23
Outstanding, Ending Balance, in Weighted Average Exercise Price,	22.59	$ 22.04
Exercisable at December 31, 2014, in Weighted Average Exercise Price	21.68
Vested and Expected to Vest, in Weighted Average Exercise Price	$ 24.47
Outstanding at December 31, 2014, Weighted Average Remaining Contractual Life, in years	5 years 8 months 20 days
Exercisable at December 31, 2014, Weighted Average Remaining Contractual Life, in years	4 years 6 months 8 days
Vested and Expected to Vest, Weighted Average Remaining Contractual Life, in years	8 years 2 months 8 days
Outstanding at December 31, 2014, Aggregate Intrinsic Value	$ 1,875
Exercisable at December 31, 2014, Aggregate Intrinsic Value	1,512
Vested and Expected to Vest, Aggregate Intrinsic Value	$ 363
Shares Available for Grant at Period End, in shares	401,000