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Fair Value Measurements (Details 1) - Level 3 - Fair Value, Measurements, Recurring
9 Months Ended
Sep. 30, 2018
Minimum | Private label collateralized mortgage obligations  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 4.80%
Annual default rates 0.00%
Loss severity rates 5.20%
Discount rates 2.20%
Minimum | SBA securities  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 5.00%
Annual default rates 1.00%
Loss severity rates 10.00%
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 30.50%
Annual default rates 25.30%
Loss severity rates 135.50%
Discount rates 10.50%
Maximum | SBA securities  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 15.00%
Annual default rates 2.00%
Loss severity rates 60.00%
Discount rates 4.30%
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 9.40%
Annual default rates 2.20%
Loss severity rates 47.30%
Discount rates 6.20%
Weighted Average | Private label collateralized mortgage obligations  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 9.40%
Annual default rates 2.20%
Loss severity rates 47.30%
Discount rates 6.20%
Weighted Average | SBA securities  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Voluntary annual prepayment speeds 14.20%
Annual default rates 1.90%
Loss severity rates 55.90%
Discount rates 3.60%