Earnings Per Common Share - Additional Information (Details)					3 Months Ended		9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2014 Stock options [Member]	Sep. 30, 2013 Stock options [Member]	Sep. 30, 2014 Stock options [Member]	Sep. 30, 2013 Stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options for aggregate common shares	451,530	337,696	369,363	232,000
Securities not included in the computation of diluted earnings per share because the effect would be antidilutive					288,834	331,863	316,668	224,000