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Fair Value of Financial Instruments Significant Unobservable Inputs Level 3 (Details) - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 3 [Member]
6 Months Ended
Jun. 30, 2015
CMBS [Member]  
Fair Value Inputs, Quantitative Information [Abstract]  
Fair Value Inputs, Prepayment Rate [1] 20.00%
Fair Value Inputs, Probability of Default [1] 2.00%
Fair Value Inputs, Loss Severity [1] 35.00%
Fair Value Inputs, Discount Rate [1] 9.10%
RMBS [Member]  
Fair Value Inputs, Quantitative Information [Abstract]  
Fair Value Inputs, Prepayment Rate [1] 10.00%
Fair Value Inputs, Probability of Default [1] 1.00%
Fair Value Inputs, Loss Severity [1] 20.00%
Fair Value Inputs, Discount Rate [1] 6.50%
[1] Data presented are weighted averages.