Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2018		Sep. 30, 2017		Sep. 27, 2018	Sep. 28, 2017
Earnings Per Share [Abstract]
Stock dividend, percent										3.00%	3.00%
Net Income		$ 9,260		$ 7,416		$ 27,521		$ 21,255
Weighted Average Shares- Basic, in shares		14,431	[1]	14,305	[2]	14,393	[1]	14,306	[2]
Earnings Per Share- Basic, in dollars per share		$ 0.64	[1]	$ 0.52	[1]	$ 1.91	[1]	$ 1.49	[2]
Dilutive Average Shares Attributable to Stock Options		89		80		86		95
Weighted Average Shares- Diluted, in shares	[2]	14,520		14,385		14,479		14,401
Earnings Per Share- Diluted, in dollars per share		$ 0.64	[1]	$ 0.52	[1]	$ 1.90	[1]	$ 1.48	[2]

[1] Cash dividends paid per share have been adjusted for the September 27, 2018 3% stock dividend.

[2] Share and Per Share Amounts have been restated for the September 27, 2018 3% stock dividend.