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Fair Value Measurements Fair Value Measurements (Details 2) (Fair Value, Inputs, Level 3 [Member], Collateralized Mortgage Obligations [Member], Fair Value, Measurements, Recurring [Member])
6 Months Ended
Jun. 30, 2014
Minimum [Member]
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value Inputs, Prepayment Rate 0.00%
Fair Value Inputs, Probability of Default 0.00%
Fair Value Inputs, Loss Severity 0.00%
Fair Value Inputs, Discount Rate 0.00%
Maximum [Member]
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value Inputs, Prepayment Rate 0.00%
Fair Value Inputs, Probability of Default 0.00%
Fair Value Inputs, Loss Severity 0.00%
Fair Value Inputs, Discount Rate 0.00%
Weighted Average [Member]
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value Inputs, Prepayment Rate 0.00%
Fair Value Inputs, Probability of Default 0.00%
Fair Value Inputs, Loss Severity 0.00%
Fair Value Inputs, Discount Rate 0.00%