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Interest Rate Swap Derivatives (Details 2) - Interest Income (Expense) [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Gain or (loss) on cash flow hedging relationships in Subtopic 815-20 |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income | $ 560 | $ (1,594)
Cash Flow Hedge [Member] |  |
Gain or (loss) on cash flow hedging relationships in Subtopic 815-20 |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income | $ 560 | $ (1,594)

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