Real Estate Securities (Parenthetical Information Regarding Real Estate Securities) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Investment Holdings [Line Items]
Change in unrealized gain or loss on real estate securities	$ 4,785,568	$ 6,269,964	$ (9,953,797)	$ 15,662,891
Interest-Only Securities [Member]
Investment Holdings [Line Items]
Principal or Notional Balance	$ 69,600,000		$ 69,600,000