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Valuation Qualtitative Information (Details) - Level 3 [Member] - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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Non-Agency RMBS [Member] | Market Quotes [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value |  | $ 6,387,000 | $ 2,258,000
Non-Agency RMBS [Member] | Market Quotes [Member] | Minimum [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Non-Binding Third-Party Valuation |  | 53.49 | 57.84
Non-Agency RMBS [Member] | Market Quotes [Member] | Maximum [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Non-Binding Third-Party Valuation |  | 90.37 | 87.45
Non-Agency RMBS [Member] | Market Quotes [Member] | Weighted Average [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Non-Binding Third-Party Valuation | [1] | 76.94 | 78.02
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value |  | $ 1,246,000 | $ 6,574,000
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] | Minimum [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Yield |  | 3.70% | 4.60%
Projected Collateral Prepayments |  | 51.70% | 19.20%
Projected Collateral Losses |  | 4.40% | 0.90%
Projected Collateral Recoveries |  | 10.30% | 8.80%
Projected Collateral Scheduled Amortization |  | 18.00% | 33.10%
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] | Maximum [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Yield |  | 4.90% | 5.10%
Projected Collateral Prepayments |  | 66.50% | 44.90%
Projected Collateral Losses |  | 9.30% | 20.10%
Projected Collateral Recoveries |  | 11.90% | 31.50%
Projected Collateral Scheduled Amortization |  | 28.00% | 47.50%
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] | Weighted Average [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Yield | [1] | 4.10% | 4.80%
Projected Collateral Prepayments | [1] | 60.40% | 26.50%
Projected Collateral Losses | [1] | 6.40% | 9.20%
Projected Collateral Recoveries | [1] | 10.80% | 22.50%
Projected Collateral Scheduled Amortization | [1] | 22.40% | 41.80%
Projected Total | [1] | 100.00% | 100.00%
Interest-Only [Member] | Agency RMBS [Member] | Valuation, Income Approach [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair Value |  | $ 4,108,000 | $ 2,254,000
Interest-Only [Member] | Agency RMBS [Member] | Valuation, Income Approach [Member] | Minimum [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Projected Collateral Prepayments |  | 31.70% | 43.80%
Projected Collateral Scheduled Amortization |  | 30.60% | 11.90%
LIBOR OAS | [2] | 5.48% | 6.27%
Interest-Only [Member] | Agency RMBS [Member] | Valuation, Income Approach [Member] | Maximum [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Projected Collateral Prepayments |  | 69.40% | 88.10%
Projected Collateral Scheduled Amortization |  | 68.30% | 56.20%
LIBOR OAS | [2] | 14.26% | 14.08%
Interest-Only [Member] | Agency RMBS [Member] | Valuation, Income Approach [Member] | Weighted Average [Member] |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Projected Collateral Prepayments | [1] | 58.40% | 71.20%
Projected Collateral Scheduled Amortization | [1] | 41.60% | 28.80%
Projected Total | [1] | 100.00% | 100.00%
LIBOR OAS | [1],[2] | 6.34% | 7.81%
[1] | Averages are weighted based on the fair value of the related instrument.
[2] | Shown in basis points.

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