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Valuation Qualtitative Information (Details) - Level 3 [Member] - USD ($)	Mar. 31, 2020	Dec. 31, 2019
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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- Definition

The interest rate spread between LIBOR and OAS used as an input to measure fair value, net. Includes positive and negative OAS inputs.

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The interest rate spread between LIBOR and OAS used as an input to measure fair value.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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