Per Share Data (Computations of Basic Earnings Per Share and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Basic Earnings per Share:
Net Income	$ 7,325	$ 6,687	$ 14,631	$ 12,992
Weighted Average Shares Outstanding	13,256,026	13,210,150	13,238,836	13,194,754
Basic Earnings per Share (USD per share)	$ 0.55	$ 0.51	$ 1.11	$ 0.98
Diluted Earnings per Share:
Net Income	$ 7,325	$ 6,687	$ 14,631	$ 12,992
Weighted Average Shares Outstanding	13,256,026	13,210,150	13,238,836	13,194,754
Potentially Dilutive Shares, Net	7,578	20,662	7,523	21,330
Diluted Weighted Average Shares Outstanding	13,263,604	13,230,812	13,246,359	13,216,084
Diluted Earnings per Share (USD per share)	$ 0.55	$ 0.51	$ 1.10	$ 0.98