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Fair Value Measurements (Details 1) - Level 3 - Fair Value, Measurements, Recurring
3 Months Ended
Mar. 31, 2019
Minimum | Private label collateralized mortgage obligations  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 3.90%
Annual default rates (1) 0.30%
Loss severity rates (1) 5.60%
Discount rates 2.50%
Minimum | Asset-backed Securities  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 12.00%
Annual default rates (1) 2.00%
Loss severity rates (1) 60.00%
Discount rates 3.20%
Maximum | Private label collateralized mortgage obligations  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 22.40%
Annual default rates (1) 82.00%
Loss severity rates (1) 159.50%
Discount rates 9.60%
Maximum | Asset-backed Securities  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 15.00%
Annual default rates (1) 2.00%
Loss severity rates (1) 60.00%
Discount rates 5.20%
Weighted Average | Covered Private Label Collateralized Mortgage Obligations Member [Domain]  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 10.80%
Annual default rates (1) 1.80%
Loss severity rates (1) 51.80%
Discount rates 6.40%
Weighted Average | Private label collateralized mortgage obligations  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 10.80%
Annual default rates (1) 1.80%
Loss severity rates (1) 51.80%
Discount rates 6.40%
Weighted Average | Asset-backed Securities  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 13.80%
Annual default rates (1) 2.00%
Loss severity rates (1) 60.00%
Discount rates 4.20%