Fair Value (Schedule of Fair Value Option) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Financial Instruments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	$ 466,768,282	$ 170,671,683
Amount Due Upon Maturity	510,321,975	173,315,857
Difference	(43,553,693)	(2,644,174)
30-Year Adjustable Rate Mortgage [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	3,078,408	3,240,330
Amount Due Upon Maturity	2,939,138	3,083,892
Difference	139,270	156,438
30-Year Fixed Rate Mortgage [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	179,210,281	66,519,702
Amount Due Upon Maturity	170,322,090	61,034,333
Difference	8,888,191	5,485,369
Non-Agency RMBS [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	273,639,784	100,911,651
Amount Due Upon Maturity	319,366,757	109,197,632
Difference	(45,726,973)	(8,285,981)
Residential Mortgage Backed Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	455,928,473	170,671,683
Amount Due Upon Maturity	492,627,985	173,315,857
Difference	(36,699,512)	(2,644,174)
Mortgage loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value	10,839,809
Amount Due Upon Maturity	17,693,990
Difference	$ (6,854,181)