Net Income Per Common Share (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Net Income Per Common Share
Number of options outstanding (in shares)	518,670	398,612
Weighted average exercise price of options outstanding (in dollars per share)	$ 9.22	$ 8.05
Dilutive effect of stock options (in shares)	214,075	232,024