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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings per basic and diluted weighted average common share outstanding        
Net income $ 3,604 $ 4,977 $ 8,338 $ 7,909
Basic weighted-average common shares outstanding 9,374,000 9,327,000 9,372,000 9,316,000
Effect of potentially dilutive common shares 58,871 28,508 50,868 32,757
Diluted weighted-average common shares outstanding 9,433,000 9,355,000 9,423,000 9,348,000
Earnings per basic common share $ 0.38 $ 0.53 $ 0.89 $ 0.85
Earnings per diluted common share $ 0.38 $ 0.53 $ 0.88 $ 0.85
Antidilutive shares not included in diluted common share calculation 59,541 34,000 44,770 45,801