Earnings Per Share (Details) (USD $) In Thousands, except 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	$ 3,674	$ 4,005	$ 11,308	$ 11,354
Weighted average common shares outstanding	6,309,000	6,269,000	6,298,000	6,252,000
Dilutive effect of common stock equivalents	15,000	11,000	13,000	12,000
Weighted average common and common equivalent shares outstanding	6,324,000	6,280,000	6,311,000	6,264,000
Basic earnings per common share	$ 0.58	$ 0.64	$ 1.80	$ 1.82
Diluted earnings per common share	$ 0.58	$ 0.64	$ 1.79	$ 1.81
Average stock options outstanding which were not included in the calculation of diluted earnings per share	0	0	0	0