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Fair Value Measurements (Details 1) - Level 3 - Fair Value, Measurements, Recurring
3 Months Ended
Mar. 31, 2018
Minimum | Private label collateralized mortgage obligations  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 3.80%
Annual default rates 0.10%
Loss severity rates 3.20%
Discount rates 2.00%
Maximum | Private label collateralized mortgage obligations  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 52.70%
Annual default rates 16.50%
Loss severity rates 105.70%
Discount rates 10.30%
Weighted Average | Private Label CMOs  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 8.30%
Annual default rates 2.50%
Loss severity rates 46.30%
Discount rates 5.30%
Weighted Average | Private label collateralized mortgage obligations  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 8.30%
Annual default rates 2.50%
Loss severity rates 46.30%
Discount rates 5.30%
Weighted Average | SBA securities  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 14.00%
Annual default rates 1.90%
Loss severity rates 55.20%
Discount rates 3.60%