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Earnings Per Common Share - Additional Information (Details) (Options to purchase common stock [Member], USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Options to purchase common stock [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Options excluded from computation of earnings per share (in shares) 18,118 19,518
Weighted average price (in dollars per share) $ 18.19 $ 18.15