Real Estate Securities (Narrative) (Details) (USD $)	3 Months Ended			12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Minimum [Member]	Dec. 31, 2012 Minimum [Member]	Mar. 31, 2013 Maximum [Member]	Dec. 31, 2012 Maximum [Member]	Mar. 31, 2013 Weighted Average [Member]	Dec. 31, 2012 Weighted Average [Member]
Investment Holdings [Line Items]
Contractual maturities			8 years 4 months 24 days	8 years 7 months 6 days	33 years 9 months 18 days	33 years 8 months 12 days	26 years 6 months	26 years 1 month 6 days
Proceeds from the sale of real estate securities	$ 6,801,398	$ 25,502,294
Realized loss on the sale of real estate securities		(1,932,758)
Realized loss on other-than-temporary impairments		$ (128,287)