Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2018		Jun. 30, 2017		Sep. 28, 2017
Earnings Per Share [Abstract]
Stock dividend, percent										3.00%
Net Income		$ 9,730		$ 7,208		$ 18,261		$ 13,839
Weighted Average Shares- Basic, in shares		13,975	[1]	13,890	[2]	13,955	[1]	13,889	[2]
Earnings Per Share- Basic, in dollars per share		$ 0.70		$ 0.52		$ 1.31	[1]	$ 1.00	[2]
Dilutive Average Shares Attributable to Stock Options		83		85		83		100
Weighted Average Shares- Diluted, in shares	[2]	14,058		13,975		14,038		13,989
Earnings Per Share- Diluted, in dollars per share		$ 0.69		$ 0.52		$ 1.30	[1]	$ 0.99	[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.