Fair Value (Schedule of Fair Value Option) (Details) (USD $)	Jun. 30, 2013		Dec. 31, 2012
Financial Instruments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	$ 565,320,121		$ 170,671,683
Principal and/or Notional Balance	725,010,411	[1]	173,315,857
Difference	(159,690,290)		(2,644,174)
30-Year Adjustable Rate Mortgage [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	2,591,883		3,240,330
Principal and/or Notional Balance	2,531,514	[1]	3,083,892
Difference	60,369		156,438
30-Year Fixed Rate Mortgage [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	171,910,223		66,519,702
Principal and/or Notional Balance	170,265,662	[1]	61,034,333
Difference	1,644,561		5,485,369
Non-Agency RMBS [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	270,034,590		100,911,651
Principal and/or Notional Balance	401,105,036	[1]	109,197,632
Difference	(131,070,446)		(8,285,981)
Residential Mortgage Backed Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	444,536,696		170,671,683
Principal and/or Notional Balance	573,902,212	[1]	173,315,857
Difference	(129,365,516)		(2,644,174)
Mortgage Loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	120,783,425
Principal and/or Notional Balance	151,108,199	[1]
Difference	(30,324,774)
Interest-Only Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Principal and/or Notional Balance	$ 80,000,000

[1] Non-Agency RMBS includes an IO with a notional balance of $80.0 million.