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Valuation Qualtitative Information (Details) - Level 3 [Member] - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
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Non-Agency RMBS [Member] | Market Quotes [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value |  | $ 1,461,000 | $ 2,258,000
Non-Agency RMBS [Member] | Market Quotes [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Non-Binding Third-Party Valuation |  | 87.47 | 57.84
Non-Agency RMBS [Member] | Market Quotes [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Non-Binding Third-Party Valuation |  | 90.07 | 87.45
Non-Agency RMBS [Member] | Market Quotes [Member] | Weighted Average [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Non-Binding Third-Party Valuation | [1] | 88.77 | 78.02
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value |  | $ 3,894,000 | $ 6,574,000
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Yield |  | 4.40% | 4.60%
Projected Collateral Prepayments |  | 19.40% | 19.20%
Projected Collateral Losses |  | 4.80% | 0.90%
Projected Collateral Recoveries |  | 6.40% | 8.80%
Projected Collateral Scheduled Amortization |  | 31.10% | 33.10%
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Yield |  | 12.30% | 5.10%
Projected Collateral Prepayments |  | 47.00% | 44.90%
Projected Collateral Losses |  | 20.10% | 20.10%
Projected Collateral Recoveries |  | 13.30% | 31.50%
Projected Collateral Scheduled Amortization |  | 47.80% | 47.50%
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] | Weighted Average [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Yield | [1] | 6.30% | 4.80%
Projected Collateral Prepayments | [1] | 27.90% | 26.50%
Projected Collateral Losses | [1] | 15.70% | 9.20%
Projected Collateral Recoveries | [1] | 11.50% | 22.50%
Projected Collateral Scheduled Amortization | [1] | 44.90% | 41.80%
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 |  | $ 2,152,000 |
Interest-Only [Member] | Agency RMBS [Member] | Market Quotes [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Non-Binding Third-Party Valuation |  | 12.19 |
Interest-Only [Member] | Agency RMBS [Member] | Market Quotes [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Non-Binding Third-Party Valuation |  | 19.13 |
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] | 16.83 |
Interest-Only [Member] | Agency RMBS [Member] | Income Approach Valuation Technique [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Fair Value |  | $ 2,986,000 | $ 2,254,000
Interest-Only [Member] | Agency RMBS [Member] | Income Approach Valuation Technique [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Projected Collateral Prepayments |  | 35.70% | 43.80%
Projected Collateral Scheduled Amortization |  | 21.60% | 11.90%
LIBOR OAS | [2] | 4.35% | 6.27%
Interest-Only [Member] | Agency RMBS [Member] | Income Approach Valuation Technique [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Projected Collateral Prepayments |  | 78.40% | 88.10%
Projected Collateral Scheduled Amortization |  | 64.30% | 56.20%
LIBOR OAS | [2] | 12.82% | 14.08%
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] | 68.00% | 71.20%
Projected Collateral Scheduled Amortization | [1] | 32.00% | 28.80%
Projected Total | [1] | 100.00% | 100.00%
LIBOR OAS | [1],[2] | 6.78% | 7.81%
[1] | Averages are weighted based on the fair value of the related instrument.
[2] | Shown in basis points.

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