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Valuation Qualtitative Information (Details) (Non-Agency RMBS [Member], Level 3 [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Market Quotes [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 10,129  
Discounted Cash Flows [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 2,231 $ 13,596
Minimum [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Non Binding Indicative Price $ 25.55  
Yield 7.90% 6.20%
Projected Collateral Prepayments 18.90% 12.60%
Projected Collateral Losses 34.70% 11.30%
Projected Collateral Recoveries 26.00% 6.80%
Projected Collateral Scheduled Amortization 20.40% 3.00%
Maximum [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Non Binding Indicative Price $ 82.13  
Yield 7.90% 20.40%
Projected Collateral Prepayments 18.90% 52.20%
Projected Collateral Losses 34.70% 41.40%
Projected Collateral Recoveries 26.00% 33.20%
Projected Collateral Scheduled Amortization 20.40% 52.70%
Weighted Average [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Non Binding Indicative Price $ 69.63 [1]  
Yield 7.90% [1] 8.50% [1]
Projected Collateral Prepayments 18.90% [1] 29.40% [1]
Projected Collateral Losses 34.70% [1] 26.90% [1]
Projected Collateral Recoveries 26.00% [1] 23.80% [1]
Projected Collateral Scheduled Amortization 20.40% [1] 19.90% [1]
Projected Total 100.00% [1] 100.00% [1]
[1] Averages are weighted based on the fair value of the related instrument.