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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]
9 Months Ended
Sep. 30, 2015
[1]
CMBS [Member]  
Fair Value Inputs, Quantitative Information [Abstract]  
Fair Value Inputs, Prepayment Rate 20.00%
Fair Value Inputs, Probability of Default 2.00%
Fair Value Inputs, Loss Severity 35.00%
Fair Value Inputs, Discount Rate 10.90%
RMBS [Member]  
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 6.50%
[1] Data presented are weighted averages.