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Derivatives (Details 3) - Interest Expense - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Certificates of deposits        
Derivative [Line Items]        
Recognized on certificates of deposit $ (116) $ 674 $ 1,236 $ (2,688)
Interest rate swaps        
Derivative [Line Items]        
Recognized on interest rate swaps $ 37 $ (1,327) $ (1,486) $ 3,044