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Offsetting Arrangements (Assets Offsetting) (Details) - Derivative - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Offsetting Assets [Line Items]    
Gross Amount of Recognized Assets $ 1,265 $ 771
Gross amounts Offset in the Statement of Financial Condition 0 0
Net Amount of Assets in Statement of Financial Condition 1,265 771
Financial Instruments 1,986 2,010
Cash Collateral Received 0 0
Net Amount $ (721) $ (1,239)