Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2018		Mar. 31, 2017		Sep. 28, 2017
Earnings Per Share [Abstract]
Stock dividend, percent						3.00%
Net Income		$ 8,531		$ 6,631
Basic, in shares		13,936	[1]	13,889	[2]
Basic Earnings, in dollars per share		$ 0.61		$ 0.48
Dilutive Average Shares Attributable to Stock Options	[1]	80		112
Diluted, in shares	[2]	14,016	[1]	14,001
Diluted Earnings, in dollars per share		$ 0.61		$ 0.47

[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.