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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Fair Value Assets Transfers between Level 1 and Level 2) (Details) - Available-for-sale Securities [Member] - Corporate Debt Securities [Member]
$ in Thousands
Mar. 31, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount $ 38,675