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Derivative Financial Instruments (Details 3) - Interest rate swaps - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Offsetting of financial assets and derivative assets    
Gross Amounts of Recognized Assets $ 5,360 $ 5,194
Gross Amounts Offset in the Statement of Financial Position 18 27
Net Amounts of Assets Presented in the Statement of Financial Position 5,342 5,167
Net Amount $ 5,342 $ 5,167