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Summary of Significant Accounting Policies (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
Numerator:        
Net income available to common stockholders $ 4,296 $ 4,328 $ 12,049 $ 12,165
Denominator:        
Denominator for basic earnings per share — weighted average shares 5,686 5,661 5,679 5,658
Effect of dilutive securities:        
Common stock equivalents 68 9 65 9
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed conversions 5,754 5,670 5,744 5,667
Basic earnings per share: $ 0.76 $ 0.76 $ 2.12 $ 2.15
Diluted earnings per share: $ 0.75 $ 0.76 $ 2.10 $ 2.15