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Earnings per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings per basic and diluted weighted average common share outstanding        
Net income $ 5,561 $ 3,604 $ 15,067 $ 8,338
Basic weighted-average common shares outstanding 9,443 9,374 9,440 9,372
Effect of potentially dilutive common shares 38 59 34 51
Diluted weighted-average common shares outstanding 9,481 9,433 9,474 9,423
Earnings per common share:        
Earnings per basic common share $ 0.59 $ 0.38 $ 1.60 $ 0.89
Earnings per diluted common share $ 0.59 $ 0.38 $ 1.59 $ 0.88
Antidilutive shares not included in diluted common share calculation 95 60 124 45