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Commercial Mortgage Residual Interests (Schedule of Key Assumptions Used in Determining the Value of the Residuals) (Details) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
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
Minimum |  |
Mortgage Loans On Real Estate [Line Items] |  |
Average Life Equivalent CPR Speeds Range | 0.87% | 0.87%
Foreclosures Frequency Curve Default Model | 0.72% | 0.70%
Maximum |  |
Mortgage Loans On Real Estate [Line Items] |  |
Average Life Equivalent CPR Speeds Range | 21.73% | 26.30%
Foreclosures Frequency Curve Default Model | 1.57% | 2.45%

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- Definition Average Life Equivalent CPR Speeds Range Assumption + References No definition available. + Details
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- Definition Discount Rate Valuation Adjustment Assumption + References No definition available. + Details
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- Definition Foreclosures Frequency Curve Default Model Assumption + References No definition available. + Details
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- Definition Libor Yield Assumption + References No definition available. + Details
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- Definition Loss Severity of Loans in Foreclosure Assumption + References No definition available. + Details
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- Definition Yield Prime Assumption + References No definition available. + 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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