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Derivative Financial Instruments (Details 3) - Interest rate swap contracts - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Offsetting Assets    
Gross Amounts of Recognized Assets $ 5,194 $ 6,681
Gross Amounts Offset in the Statement of Financial Condition 27 60
Net Amounts of Assets Presented in the Statement of Financial Condition 5,167 6,621
Net Amount $ 5,167 $ 6,621