Offsetting Assets and Liabilities (Schedule of Offsetting of Liabilities) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Repurchase agreements
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	$ 134,062,326	$ 116,080,467
Total
Gross Amounts of Recognized Liabilities	375,730,565	117,225,211
Gross Amounts Offset in the Consolidated Balance Sheet	(593,450)
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	375,137,115	117,225,211
Gross Amounts Not Offset in the Consolidated Balance Sheet
Financial Instruments Pledged	(372,738,804)	(114,745,162)
Cash Collateral Pledged	(2,209,549)	(2,480,049)
Net Amount	188,762
Mortgage Loans [Member]
Repurchase agreements
Gross Amounts of Recognized Liabilities	240,477,801
Gross Amounts Offset in the Consolidated Balance Sheet
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	240,477,801
Gross Amounts Not Offset in the Consolidated Balance Sheet
Financial Instruments Pledged	(240,477,801)
Cash Collateral Pledged
Net Amount
Agency and Non-Agency Securities [Member]
Repurchase agreements
Gross Amounts of Recognized Liabilities	134,062,326	116,080,467
Gross Amounts Offset in the Consolidated Balance Sheet
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	134,062,326	116,080,467
Gross Amounts Not Offset in the Consolidated Balance Sheet
Financial Instruments Pledged	(132,261,003)	(114,745,162)
Cash Collateral Pledged	(1,801,323)	(1,335,305)
Net Amount
Interest Rate Swap [Member]
Derivatives
Gross Amounts of Recognized Liabilities	270,438	1,144,744
Gross Amounts Offset in the Consolidated Balance Sheet	(217,981)
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	52,457	1,144,744
Gross Amounts Not Offset in the Consolidated Balance Sheet
Financial Instruments Pledged
Cash Collateral Pledged	(52,457)	(1,144,744)
Net Amount
TBAs [Member]
Derivatives
Gross Amounts of Recognized Liabilities	920,000
Gross Amounts Offset in the Consolidated Balance Sheet	(375,469)
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	544,531
Gross Amounts Not Offset in the Consolidated Balance Sheet
Financial Instruments Pledged
Cash Collateral Pledged	(355,769)
Net Amount	$ 188,762