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Offsetting Arrangements (Assets Offsetting) (Details) - Derivative - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Offsetting Assets [Line Items]    
Gross Amount of Recognized Assets $ 3,025 $ 8,107
Gross amounts Offset in the Statement of Financial Condition 0 0
Net Amount of Assets in Statement of Financial Condition 3,025 8,107
Financial Instruments 2,000 2,006
Cash Collateral Received 0 0
Net Amount $ 1,025 $ 6,101