Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2019		Jun. 30, 2018		Jun. 30, 2019		Jun. 30, 2018		Sep. 27, 2018
Earnings Per Share [Abstract]
Stock dividend, percent										3.00%
Net Income		$ 8,934		$ 9,730		$ 17,668		$ 18,261
Weighted Average Shares - Basic (in shares)		14,487	[1]	14,394	[2]	14,478	[1]	14,374	[2]
Earnings Per Share - Basic (in dollars per share)		$ 0.62	[1]	$ 0.68	[1]	$ 1.22	[1]	$ 1.27	[2]
Dilutive Average Shares Attributable to Stock Options (in shares)		40		86		45		85
Weighted Average Shares - Diluted (in shares)	[2]	14,527		14,480		14,523		14,459
Earnings Per Share - Diluted (in dollars per share)		$ 0.62	[1]	$ 0.67	[1]	$ 1.22	[1]	$ 1.26	[2]

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

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