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Fair Value (Schedule of Quantitative Information about Level 3 Fair Value Measurements) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Non-Agency RMBS [Member] | Level 3 [Member]
 
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value 273,639,784 [1]
Alternative - A [Member] | Level 3 [Member]
 
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value 97,364,228 [1]
Alternative - A [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
 
Unobservable Input  
Constant voluntary prepayment 1.50% [1]
Constant default rate 1.40% [1]
Loss severity 2.50% [1]
Delinquency 4.00% [1]
Alternative - A [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
 
Unobservable Input  
Constant voluntary prepayment 12.00% [1]
Constant default rate 10.60% [1]
Loss severity 70.80% [1]
Delinquency 30.10% [1]
Alternative - A [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
 
Unobservable Input  
Constant voluntary prepayment 7.00% [1]
Constant default rate 6.70% [1]
Loss severity 45.50% [1]
Delinquency 16.80% [1]
Pay Option Adjustable Rate [Member] | Level 3 [Member]
 
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value 31,608,908 [1]
Pay Option Adjustable Rate [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
 
Unobservable Input  
Constant voluntary prepayment 1.00% [1]
Constant default rate 3.30% [1]
Loss severity 3.40% [1]
Delinquency 4.10% [1]
Pay Option Adjustable Rate [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
 
Unobservable Input  
Constant voluntary prepayment 20.30% [1]
Constant default rate 14.00% [1]
Loss severity 72.70% [1]
Delinquency 32.50% [1]
Pay Option Adjustable Rate [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
 
Unobservable Input  
Constant voluntary prepayment 7.80% [1]
Constant default rate 6.30% [1]
Loss severity 55.50% [1]
Delinquency 14.60% [1]
Prime [Member] | Level 3 [Member]
 
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value 110,237,355 [1]
Prime [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
 
Unobservable Input  
Constant voluntary prepayment 1.20% [1]
Constant default rate 2.40% [1]
Loss severity 5.50% [1]
Delinquency 2.80% [1]
Prime [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
 
Unobservable Input  
Constant voluntary prepayment 20.00% [1]
Constant default rate 10.30% [1]
Loss severity 63.00% [1]
Delinquency 27.80% [1]
Prime [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
 
Unobservable Input  
Constant voluntary prepayment 9.70% [1]
Constant default rate 6.40% [1]
Loss severity 43.70% [1]
Delinquency 15.00% [1]
Subprime [Member] | Level 3 [Member]
 
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Fair Value 34,429,293 [1]
Subprime [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]
 
Unobservable Input  
Constant voluntary prepayment 0.90% [1]
Constant default rate 3.40% [1]
Loss severity 10.90% [1]
Delinquency 4.40% [1]
Subprime [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]
 
Unobservable Input  
Constant voluntary prepayment 10.20% [1]
Constant default rate 14.70% [1]
Loss severity 81.00% [1]
Delinquency 29.10% [1]
Subprime [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]
 
Unobservable Input  
Constant voluntary prepayment 3.60% [1]
Constant default rate 6.30% [1]
Loss severity 56.80% [1]
Delinquency 13.90% [1]
[1] The Company uses third-party vendor prices and dealer quotes to estimate fair value of some of its financial assets. The Company verifies selected prices by using a variety of methods, including comparing prices to internally estimated prices and corroborating the prices by reference to other independent market data, such as relevant benchmark indices and prices of similar instruments. Where the Company has disclosed unobservable inputs for broker quotes or comparable trades, those inputs are based on the Company's validations performed at the security level.