Earnings Per Comon Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Earnings Per Share [Abstract]
Net Income	$ 5,623		$ 5,748		$ 16,011		$ 16,630
Basic, in shares	12,308	[1],[2]	12,252	[1],[2]	12,282	[1],[2]	12,244	[1],[2]
Basic Earnings, in dollars per share	$ 0.46	[1],[2]	$ 0.47	[1],[2]	$ 1.30	[1],[2]	$ 1.36	[1],[2]
Dilutive Average Shares Attributable to Stock Options, in shares	36	[1]	21	[1]	20	[1]	18	[1]
Weighted Average Shares - Diluted, in shares	12,344	[1],[2]	12,273	[1],[2]	12,302	[1],[2]	12,262	[1],[2]
Diluted Earnings, in dollars per share	$ 0.46	[1],[2]	$ 0.47	[1],[2]	$ 1.30	[1],[2]	$ 1.36	[1],[2]
Antidilutive Securities Excluded from the Calculation of Earnings Per Share, in shares	47	[1]	129	[1]	47	[1]	203	[1]

[1] All share and per share amounts have been adjusted for the September 2013 2% stock dividend

[2] Share and Per Share Amounts have been restated for the September 2013 2% stock dividend.