Per Share Data (Computations of Basic Earnings Per Share and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic Earnings per Share:
NET INCOME	$ 7,721	$ 7,708	$ 22,352	$ 20,700
Weighted Average Shares Outstanding	13,265,893	13,210,395	13,247,954	13,200,025
Basic Earnings per Share (USD per share)	$ 0.58	$ 0.58	$ 1.69	$ 1.57
Diluted Earnings per Share:
NET INCOME	$ 7,721	$ 7,708	$ 22,352	$ 20,700
Weighted Average Shares Outstanding	13,265,893	13,210,395	13,247,954	13,200,025
Potentially Dilutive Shares, Net	7,617	20,280	7,556	20,975
Diluted Weighted Average Shares Outstanding	13,273,510	13,230,675	13,255,510	13,221,000
Diluted Earnings per Share (USD per share)	$ 0.58	$ 0.58	$ 1.69	$ 1.57