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Valuation Qualtitative Information (Details) - Level 3 [Member] - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
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Non-Agency RMBS [Member] | Market Quotes [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | $ 1,042,000 | $ 1,558,000
Non-Agency RMBS [Member] | Market Quotes [Member] | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Non-Binding Third-Party Valuation | 77.00 | 64.56
Non-Agency RMBS [Member] | Market Quotes [Member] | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Non-Binding Third-Party Valuation | 81.57 | 89.04
Non-Agency RMBS [Member] | Market Quotes [Member] | Weighted Average [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Non-Binding Third-Party Valuation | 79.74 | 81.56
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | $ 1,959,000 | $ 1,715,000
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Yield | 2.50% | 1.30%
Projected Collateral Prepayments | 48.40% | 50.50%
Projected Collateral Losses | 3.10% | 2.20%
Projected Collateral Recoveries | 8.10% | 6.60%
Projected Collateral Scheduled Amortization | 18.10% | 21.60%
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Yield | 9.80% | 9.90%
Projected Collateral Prepayments | 61.10% | 61.80%
Projected Collateral Losses | 8.70% | 2.20%
Projected Collateral Recoveries | 13.10% | 14.50%
Projected Collateral Scheduled Amortization | 40.40% | 40.70%
Non-Agency RMBS [Member] | Discounted Cash Flows [Member] | Weighted Average [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Yield | 7.30% | 4.40%
Projected Collateral Prepayments | 55.60% | 57.70%
Projected Collateral Losses | 7.10% | 2.20%
Projected Collateral Recoveries | 11.10% | 11.60%
Projected Collateral Scheduled Amortization | 26.20% | 28.50%
Projected Total | 100.00% | 100.00%
Interest-Only [Member] | Agency RMBS [Member] | Market Quotes [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | $ 4,641,000 | $ 2,615,000
Interest-Only [Member] | Agency RMBS [Member] | Market Quotes [Member] | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Non-Binding Third-Party Valuation | 5.71 | 6.67
Interest-Only [Member] | Agency RMBS [Member] | Market Quotes [Member] | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Non-Binding Third-Party Valuation | 19.18 | 17.14
Interest-Only [Member] | Agency RMBS [Member] | Market Quotes [Member] | Weighted Average [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Non-Binding Third-Party Valuation | 11.05 | 11.96
Interest-Only [Member] | Agency RMBS [Member] | Valuation, Income Approach [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value | $ 500,000 |
Assets, Fair Value Disclosure | $ 2,325,000 | $ 5,024,000
Interest-Only [Member] | Agency RMBS [Member] | Valuation, Income Approach [Member] | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Projected Collateral Prepayments | 55.50% | 41.70%
Projected Collateral Scheduled Amortization | 10.70% | 19.70%
LIBOR OAS | 1.64% | 0.77%
Interest-Only [Member] | Agency RMBS [Member] | Valuation, Income Approach [Member] | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Projected Collateral Prepayments | 89.30% | 80.30%
Projected Collateral Scheduled Amortization | 44.50% | 58.30%
LIBOR OAS | 9.43% | 255.53%
Interest-Only [Member] | Agency RMBS [Member] | Valuation, Income Approach [Member] | Weighted Average [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Inputs LIBOR OAS Including Negative | 0.55% |
Projected Collateral Prepayments | 81.70% | 73.40%
Projected Collateral Scheduled Amortization | 18.30% | 26.60%
Projected Total | 100.00% | 100.00%
LIBOR OAS | 3.05% | 8.24%

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