Valuation Qualtitative Information (Details) - Level 3 [Member] - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Non-Agency RMBS [Member] | Market Quotes [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value   $ 7,819,000
Non-Agency RMBS [Member] | Market Quotes [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Non-Binding Third-Party Valuation   21.38
Non-Agency RMBS [Member] | Market Quotes [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Non-Binding Third-Party Valuation   84.91
Non-Agency RMBS [Member] | Market Quotes [Member] | Weighted Average [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Non-Binding Third-Party Valuation [1]   54.11
Non-Agency RMBS [Member] | Discounted Cash Flows [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 4,020,000 $ 2,263,000
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 8.80% 6.30%
Projected Collateral Prepayments 32.50% 35.90%
Projected Collateral Losses 1.30% 7.50%
Projected Collateral Recoveries 3.40% 11.00%
Projected Collateral Scheduled Amortization 13.10% 45.60%
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 25.70% 6.30%
Projected Collateral Prepayments 68.70% 35.90%
Projected Collateral Losses 9.00% 7.50%
Projected Collateral Recoveries 9.20% 11.00%
Projected Collateral Scheduled Amortization 60.10% 45.60%
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] | Weighted Average [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield [1] 13.40% 6.30%
Projected Collateral Prepayments [1] 60.50% 35.90%
Projected Collateral Losses [1] 5.30% 7.50%
Projected Collateral Recoveries [1] 6.40% 11.00%
Projected Collateral Scheduled Amortization [1] 27.80% 45.60%
Projected Total [1] 100.00% 100.00%
Interest-Only [Member] | Agency RMBS [Member] | Market Quotes [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 5,645,000 $ 7,006,000
Interest-Only [Member] | Agency RMBS [Member] | Market Quotes [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Non-Binding Third-Party Valuation 4.39 4.74
Interest-Only [Member] | Agency RMBS [Member] | Market Quotes [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Non-Binding Third-Party Valuation 21.63 20.38
Interest-Only [Member] | Agency RMBS [Member] | Market Quotes [Member] | Weighted Average [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Non-Binding Third-Party Valuation [1] 11.88 13.35
Interest-Only [Member] | Agency RMBS [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 2,113,000 $ 4,238,000
Interest-Only [Member] | Agency RMBS [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Projected Collateral Prepayments 52.70% 63.30%
Projected Collateral Scheduled Amortization 12.00% 7.70%
LIBOR OAS [2] 2.21% 0.83%
Interest-Only [Member] | Agency RMBS [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Projected Collateral Prepayments 88.00% 92.30%
Projected Collateral Scheduled Amortization 47.30% 36.70%
LIBOR OAS [2] 9.84% 19.52%
Interest-Only [Member] | Agency RMBS [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Projected Collateral Prepayments [1] 74.10% 75.20%
Projected Collateral Scheduled Amortization [1] 25.90% 24.80%
Projected Total [1] 100.00% 100.00%
LIBOR OAS [1],[2] 5.76% 4.90%
[1] Averages are weighted based on the fair value of the related instrument.
[2] Shown in basis points.