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5. Financial risk management (Details 3)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
ARS ($)
SummaryOfFinancialRiskManagementLineItems [Line Items]      
Total loans $ 9,856,665 $ 12,716,656 $ 9,678,949
Decrease in the profit (loss) due to a 1% increase in floating interest rates (3,202) (6,521)  
Increase in the profit (loss) due to a 1% decrease in floating interest rates 3,202 6,521  
US dollar      
SummaryOfFinancialRiskManagementLineItems [Line Items]      
Total loans 9,856,665 12,716,656  
Fixed rate      
SummaryOfFinancialRiskManagementLineItems [Line Items]      
Total loans 8,340,891 9,779,750  
Fixed rate | US dollar      
SummaryOfFinancialRiskManagementLineItems [Line Items]      
Total loans 8,340,891 9,779,750  
Floating rate      
SummaryOfFinancialRiskManagementLineItems [Line Items]      
Total loans 1,515,774 2,936,906  
Floating rate | US dollar      
SummaryOfFinancialRiskManagementLineItems [Line Items]      
Total loans 1,515,774 2,936,906  
Decrease in the profit (loss) due to a 1% increase in floating interest rates (3,202) (6,521)  
Increase in the profit (loss) due to a 1% decrease in floating interest rates $ 3,202 $ 6,521