Mortgage Loans (Schedule of Mortgage Loans at Fair Value) (Details) (Mortgage Receivable [Member], USD $)	Sep. 30, 2013		Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	$ 334,793,412
Unpaid Principal Balance	406,167,821
Difference	(71,374,409)
Fixed [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	177,653,853
Unpaid Principal Balance	219,759,258
Difference	(42,105,405)
ARM [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	148,217,087
Unpaid Principal Balance	173,301,235
Difference	(25,084,148)
Performing Loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	325,870,940
Unpaid Principal Balance	393,060,493
Difference	(67,189,553)
Nonperforming Loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	8,922,472	[1]
Unpaid Principal Balance	13,107,328	[1]
Difference	$ (4,184,856)

[1] Loans that are delinquent for 60 days or more are considered non-performing.