Annual report pursuant to Section 13 and 15(d)

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

v3.19.1
Fair Value, Quantitative Information about Level 3 Fair Value Measurements (Details)
Dec. 31, 2018
Dec. 31, 2017
Measurement Input, Constant Prepayment Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value measurement input 0.086 0.098
Measurement Input, Constant Prepayment Rate [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value measurement input 0.076 0.082
Measurement Input, Constant Prepayment Rate [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value measurement input 0.096 0.112
Measurement Input, Default Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value measurement input 0.013 0.017
Measurement Input, Default Rate [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value measurement input 0.010 0.013
Measurement Input, Default Rate [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value measurement input 0.015 0.020
Measurement Input, Discount Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value measurement input 0.094 0.099
Measurement Input, Discount Rate [Member] | Minimum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value measurement input 0.082 0.083
Measurement Input, Discount Rate [Member] | Maximum [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value measurement input 0.107 0.112