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Valuation Qualtitative Information (Details) - Level 3 [Member] - USD ($)

Mar. 31, 2018

Dec. 31, 2017

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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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