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Offsetting of Financial Assets and Liabilities (Assets Offsetting) (Details) - Derivative [Member] - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Offsetting Assets [Line Items]    
Gross Amount of Recognized Assets $ 6,000 $ 347,000
Gross amounts Offset in the Statement of Financial Condition 0 0
Net Amount of Assets in Statement of Financial Condition 6,000 347,000
Financial Instruments 0 2,037,000
Cash Collateral Received 0 0
Net Amount $ 6,000 $ (1,690,000)