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Loans commitments and financial guarantees contracts (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financial assets [1] $ 488,003 $ 403,035
1-4 [member]    
Financial assets [1] 151,934 145,255
5-6 [member]    
Financial assets [1] 336,069 193,368
7 [member]    
Financial assets [1] 0 64,412
8 [member]    
Financial assets [1] 0 0
9 [member]    
Financial assets [1] 0 0
10 [member]    
Financial assets [1] $ 0 $ 0
[1] Current ratings as of December 31, 2017 and 2016, respectively.