Earnings Per Common 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		Sep. 28, 2017
Earnings Per Share [Abstract]
Stock dividend, percent										3.00%
Net Income		$ 7,416		$ 6,738		$ 21,255		$ 19,934
Basic, in shares		13,889	[1]	13,810	[2]	13,889	[1]	13,775	[2]
Basic Earnings, in dollars per share		$ 0.53	[1]	$ 0.49	[2]	$ 1.53	[1]	$ 1.45	[2]
Dilutive Average Shares Attributable to Stock Options	[1]	77		91		92		67
Diluted, in shares	[2]	13,966	[1]	13,901		13,981	[1]	13,842
Diluted Earnings, in dollars per share		$ 0.53	[1]	$ 0.48	[2]	$ 1.52	[1]	$ 1.44	[2]

[1] Cash dividends paid per share have been adjusted for the September 28, 2017 3% stock dividend.

[2] Share and Per Share Amounts have been restated for the September 28, 2017 3% stock dividend.