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Significant Accounting Policies (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Significant Accounting Policies [Line Items]      
Fair value of Agency RMBS transactions $ 8,412,295,000 $ 3,671,582,000  
Fair value of repurchase agreements 8,284,400,000 3,657,200,000  
Accumulated net realized loss on investments reclassified to retained earnings   (138,681,783)  
Net unrealized appreciation on investments reclassified to retained earnings   14,203,977  
Undistributed net investment income reclassified to retained earnings   75,216,001  
Net loss on paydowns reclassified to amortization of premiums on investment securities   8,025,593 2,434,091
Compensation and benefits   1,459,445 985,053
Amortization of related party benefits   1,459,445 985,053
Percentage of REIT taxable income that must be distributed to stockholders 90.00%    
Agency RMBS [Member]
     
Significant Accounting Policies [Line Items]      
Fair value of Agency RMBS transactions   $ 10,100,000  
Minimum [Member]
     
Significant Accounting Policies [Line Items]      
Repurchase agreement period (in days) 30    
Maximum [Member]
     
Significant Accounting Policies [Line Items]      
Repurchase agreement period (in days) 90