Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016		Sep. 29, 2016
Earnings Per Share [Abstract]
Stock dividend, percent										3.00%
Net Income		$ 7,208		$ 6,647		$ 13,839		$ 13,196
Basic, in shares		13,485	[1]	13,372	[2]	13,485	[1]	13,357	[2]
Basic Earnings, in dollars per share		$ 0.53	[1]	$ 0.50	[2]	$ 1.03	[1]	$ 0.99	[2]
Dilutive Average Shares Attributable to Stock Options	[1]	83		57		96		48
Diluted, in shares	[2]	13,568	[1]	13,429		13,581	[1]	13,405
Diluted Earnings, in dollars per share		$ 0.53	[1]	$ 0.49	[2]	$ 1.02	[1]	$ 0.98	[2]

[1] Cash dividends paid per share have been adjusted for the September 29, 2016 3.0% stock dividend.

[2] Share and Per Share Amounts have been restated for the September 29, 2016 3% stock dividend.