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Derivative Instruments and Hedging Activity (Details 1) - Interest Rate Swap [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Derivatives designated as cash flow hedges |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | $ 4,516 | $ 1,592
Interest Rate Cash Flow Hedge Liability at Fair Value | $ 0 | $ 242

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