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Offsetting Financial Assets and Liabilities (Assets Offsetting) (Details) - Derivative [Member] - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Offsetting Assets [Line Items]    
Gross Amount of Recognized Assets $ 110 $ 347
Gross amounts Offset in the Statement of Financial Condition 0 0
Net Amount of Assets in Statement of Financial Condition 110 347
Financial Instruments 2,076 2,037
Cash Collateral Received 0 0
Net Amount $ (1,966) $ (1,690)