Offsetting Assets and Liabilities (Schedule of Offsetting of Liabilities) (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Repurchase agreements
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	$ 308,497,415	$ 116,080,467
Total
Gross Amounts of Recognized Liabilities	405,748,411	117,225,211
Gross Amounts Offset in the Consolidated Balance Sheet	(3,069,199)
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	402,679,212	117,225,211
Gross Amounts Not Offset in the Consolidated Balance Sheet
Financial Instruments Pledged	(391,209,289)	(114,745,162)
Cash Collateral Pledged	(11,469,923)	(2,480,049)
Net Amount
Agency and Non-Agency Securities [Member]
Repurchase agreements
Gross Amounts of Recognized Liabilities	308,497,415	116,080,467
Gross Amounts Offset in the Consolidated Balance Sheet
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	308,497,415	116,080,467
Gross Amounts Not Offset in the Consolidated Balance Sheet
Financial Instruments Pledged	(302,096,964)	(114,745,162)
Cash Collateral Pledged	(6,400,451)	(1,335,305)
Net Amount
Mortgage Loans [Member]
Repurchase agreements
Gross Amounts of Recognized Liabilities	89,112,325
Gross Amounts Offset in the Consolidated Balance Sheet
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	89,112,325
Gross Amounts Not Offset in the Consolidated Balance Sheet
Financial Instruments Pledged	(89,112,325)
Cash Collateral Pledged
Net Amount
Interest Rate Swap [Member]
Derivatives
Gross Amounts of Recognized Liabilities		1,144,744
Gross Amounts Offset in the Consolidated Balance Sheet
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet		1,144,744
Gross Amounts Not Offset in the Consolidated Balance Sheet
Financial Instruments Pledged
Cash Collateral Pledged		(1,144,744)
Net Amount
TBAs [Member]
Derivatives
Gross Amounts of Recognized Liabilities	8,138,671
Gross Amounts Offset in the Consolidated Balance Sheet	(3,069,199)
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	5,069,472
Gross Amounts Not Offset in the Consolidated Balance Sheet
Financial Instruments Pledged
Cash Collateral Pledged	(5,069,472)
Net Amount