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Interest Rate Swap Derivatives (Details 2) - Interest contracts [Member] - Interest Income Expense [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Effects cash flow hedges on income statement $ 104 $ (436) $ 16 $ (1,014)
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 $ 104 $ (436) $ 16 $ (1,014)