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Commercial Mortgage Residual Interests (Schedule of Key Assumptions Used in Determining the Value of the Residuals) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Mortgage Loans On Real Estate [Line Items] |  |  |
Discount rate |  | 20.00% | 20.00%
Loss severity of loans in foreclosure |  | 20.00% | 20.00%
LIBOR |  | Forward 3-month curve | Forward 3-month curve
Prime |  | Forward curve | Forward curve
Fair value at December 31 |  | $ 36 | $ 11,115
Minimum |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |
Average life equivalent CPR speeds range (percent) | [1] | 0.87% | 0.87%
Foreclosures frequency curve default model (percent) |  | 0.00% | 0.72%
Maximum |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |
Average life equivalent CPR speeds range (percent) | [1] | 21.56% | 21.73%
Foreclosures frequency curve default model (percent) |  | 1.33% | 1.57%
[1] | Conditional prepayment rate

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- Definition The carrying amount (fair value) as of the balance sheet date of the transferor's interests in transferred financial assets (typically securitized receivables, generally not involved in the collection of principal) following transfer of significant portions of such financial instruments to other parties. Such interests could be ancillary cash flows and interest-only strips. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107314-111719 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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