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Financial instruments (Details 14) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Loans and receivables [1] $ 5,419,379 $ 5,907,494
Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 5,505,658 [2] 6,020,731
Banking and financial institutions [Member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 2,657,444 2,283,876
Industrial [Member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 772,238 1,242,441
Oil and petroleum derived products [Member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 735,413 788,186
Agricultural [Member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 501,241 1,007,139
Services [Member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 430,717 419,440
Mining [Member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 231,687 54,000
Others [Member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables $ 176,918 $ 225,649
[1] The carrying value of loans at amortized cost is net of the allowance for expected credit losses of $81.3 million and unearned interest and deferred fees of $5.0 million for December 31, 2017; allowance for expected credit losses of $106.0 million and unearned interest and deferred fees of $7.2 million for December 31, 2016.
[2] Current ratings as of December 31, 2017 and 2016, respectively.