Earnings Per Common Share - Additional Information (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options for aggregate common shares	414,894	337,696	452,530	337,696
Stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities not included in the computation of diluted earnings per share because the effect would be antidilutive	30,000	172,000