Offsetting Assets and Liabilities (Schedule of Offsetting of Liabilities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Repurchase agreements
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	$ 103,014,105	$ 138,591,678
Total
Gross Amounts of Recognized Liabilities	493,384,515	374,650,654
Gross Amounts Offset in the Consolidated Balance Sheets
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	493,384,515	374,650,654
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(492,700,259)	(373,290,126)
Cash Collateral Pledged	(684,256)	(1,360,528)
Net Amount
Mortgage Loans [Member]
Repurchase agreements
Gross Amounts of Recognized Liabilities	300,092,293	236,058,976
Gross Amounts Offset in the Consolidated Balance Sheets
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	300,092,293	236,058,976
Gross Amounts Not Offset in the Consolidated Balance Sheet
Financial Instruments	(300,092,293)	(236,058,976)
Cash Collateral Pledged
Net Amount
Agency and Non-Agency Securities [Member]
Repurchase agreements
Gross Amounts of Recognized Liabilities	103,014,105	138,591,678
Gross Amounts Offset in the Consolidated Balance Sheets
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	103,014,105	138,591,678
Gross Amounts Not Offset in the Consolidated Balance Sheet
Financial Instruments	(102,329,849)	(137,231,150)
Cash Collateral Pledged	(684,256)	(1,360,528)
Net Amount
Newly Originated Mortgage Loans [Member]
Repurchase agreements
Gross Amounts of Recognized Liabilities	89,417,564
Gross Amounts Offset in the Consolidated Balance Sheets
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	89,417,564
Gross Amounts Not Offset in the Consolidated Balance Sheet
Financial Instruments	(89,417,564)
Cash Collateral Pledged
Net Amount
Interest Rate Swap [Member]
Derivatives
Gross Amounts of Recognized Liabilities	860,553
Gross Amounts Offset in the Consolidated Balance Sheet
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	860,553
Gross Amounts Not Offset in the Consolidated Balance Sheet
Financial Instruments	860,553
Cash Collateral Pledged
Net Amount