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Loans commitments and financial guarantees contracts (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of loans commitments and financial guarantees contracts [Line Items]    
Financial assets [1] $ 488,003 $ 403,035
Confirmed letters of credit [Member]    
Disclosure of loans commitments and financial guarantees contracts [Line Items]    
Financial assets 273,449 216,608
Stand-by letters of credit and guaranteed - Commercial risk [Member]    
Disclosure of loans commitments and financial guarantees contracts [Line Items]    
Financial assets 168,976 176,177
Credit commitments [Member]    
Disclosure of loans commitments and financial guarantees contracts [Line Items]    
Financial assets $ 45,578 $ 10,250
[1] Current ratings as of December 31, 2017 and 2016, respectively.