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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Summary of average number of shares used in the computation of basic and diluted earnings per share
  Three Months Ended  Nine Months Ended 
(shares in thousands) Sep. 30,  Sep. 30,  Sep. 30  Sep. 30 
  2015  2014  2015  2014 
Basic earnings per share  4,884   4,875   4,882   4,873 
Diluted earnings per share  6,390   4,900   6,422   4,896