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Commitments (Details 3) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivatives Fair Value [Line Items]    
Assets, Fair Value $ 629 $ 185
Liabilities, Fair Value 629 185
Other assets    
Derivatives Fair Value [Line Items]    
Assets, Fair Value 629 185
Other liabilities    
Derivatives Fair Value [Line Items]    
Liabilities, Fair Value $ 629 $ 185