Quarterly report pursuant to Section 13 or 15(d)

Fair Value, Quantitative Information about Level 3 Fair Value Measurements (Details)

v3.8.0.1
Fair Value, Quantitative Information about Level 3 Fair Value Measurements (Details)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Constant prepayment speed 8.10% 9.80%
Delinquency 1.80% 1.70%
Discount rate 10.40% 9.90%
Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Constant prepayment speed 7.10% 8.20%
Delinquency 1.50% 1.30%
Discount rate 9.00% 8.30%
Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Constant prepayment speed 9.20% 11.20%
Delinquency 2.20% 2.00%
Discount rate 11.90% 11.20%