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Fair Value Measurements (Assets Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) - Significant Unobservable Inputs (Level 3) [Member] - Obligations Of States And Political Subdivisions [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 543 $ 587 $ 543 $ 614
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (543) (8) (543) (35)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 0 $ 579 $ 0 $ 579