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Fair Value Measurements (Details 1) - Level 3 - Fair Value, Measurements, Recurring
9 Months Ended
Sep. 30, 2017
Minimum | Private label collateralized mortgage obligations  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 3.20%
Annual default rates 0.10%
Loss severity rates 4.00%
Discount rates 1.60%
Maximum | Private label collateralized mortgage obligations  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 25.50%
Annual default rates 13.60%
Loss severity rates 95.90%
Discount rates 9.90%
Weighted Average | Private Label CMOs  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 9.60%
Annual default rates 2.20%
Loss severity rates 46.90%
Discount rates 4.60%
Weighted Average | Private label collateralized mortgage obligations  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 9.60%
Annual default rates 2.20%
Loss severity rates 46.90%
Discount rates 4.60%
Weighted Average | SBA securities  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 13.50%
Annual default rates 1.80%
Loss severity rates 52.40%
Discount rates 3.60%