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Fair Value of Financial Instruments Significant Unobservable Inputs Level 3 (Details) - Fair Value, Measurements, Recurring - Level 3 | 12 Months Ended
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Dec. 31, 2016
CMBS |  |
Fair Value Inputs, Quantitative Information [Abstract] |  |
Fair Value Inputs, Prepayment Rate | 0.00% | [1]
Fair Value Inputs, Probability of Default | 0.00% | [1]
Fair Value Inputs, Loss Severity | 0.00% | [1]
Fair Value Inputs, Discount Rate | 9.80% |
RMBS |  |
Fair Value Inputs, Quantitative Information [Abstract] |  |
Fair Value Inputs, Prepayment Rate | 10.00% |
Fair Value Inputs, Probability of Default | 1.00% |
Fair Value Inputs, Loss Severity | 20.00% |
Fair Value Inputs, Discount Rate | 6.30% |
[1] | As of December 31, 2016, there are too few loans collateralizing our non-Agency CMBS to reasonably apply average prepayment speed, average default rate, or average severity. The loans were individually evaluated for prepayment and default in projecting the cash flows. Based on that review, the loans are expected to pay as scheduled.

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Loss, including interest and principal, incurred on a defaulted security, expressed as a percentage of the original principal balance, used as an input to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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