Carrying Amounts and Fair Value of Financial Instruments (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013 investment	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Number of equity investments	2
Investor funding period	30 days
Review period to request a new third party appraisal	24 months
Impaired financing receivable, recorded investment	$ 37,993,710	$ 39,946,538
Fair value disclosure, off-balance sheet risks, amount, liability	$ 32,300,000