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Offsetting Arrangements (Assets Offsetting) (Details) - Derivative - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Offsetting Assets [Line Items]    
Gross Amount of Recognized Assets $ 1,330 $ 3,025
Gross amounts Offset in the Statement of Financial Condition 0 0
Net Amount of Assets in Statement of Financial Condition 1,330 3,025
Financial Instruments 2,003 2,000
Cash Collateral Received 0 0
Net Amount $ (673) $ 1,025