Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Earnings Per Share [Abstract]
Net Income	$ 23,360	$ 21,795		$ 22,179
Basic Shares, in Shares	12,604	12,542	[1]	12,492	[1]
Basic Earnings, in Earnings Per Share	$ 1.85	$ 1.74	[1]	$ 1.78	[1]
Dilutive Average Shares Attributable to Stock Options, in Shares	29	31		10
Weighted Average Shares - Diluted, in Shares	12,633	12,573	[1]	12,502	[1]
Diluted Earnings, In Earnings Per Share	$ 1.85	$ 1.73	[1]	$ 1.77	[1]
Antidilutive Shares Excluded from the Calculation of Earnings Per Share, in Shares	0	47		203

[1] Share and Per Share Amounts have been restated for the September 2014 2% stock dividend.