Concentration of Credit Risk and Off-Balance Sheet Risk - Additional Information (Details) (Lister)	3 Months Ended		6 Months Ended
	Jun. 30, 2014 Customer	Jun. 30, 2013 Customer	Jun. 30, 2014 Customer	Jun. 30, 2013 Institution Customer
Lister
Risks And Uncertainties [Abstract]
Number of institution the Company places its cash with				2
Number of energy consumption more than 10%	0	0	0	0