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Loans commitments and financial guarantees contracts (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financial assets [1] $ 488,003 $ 403,035
Up to 1 year [member]    
Financial assets 457,168 399,257
From 1 to 2 years [member]    
Financial assets 257 0
From 2 to 5 years [member]    
Financial assets 30,000 3,200
More than 5 years    
Financial assets $ 578 $ 578
[1] Current ratings as of December 31, 2017 and 2016, respectively.