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5. Financial risk management (Details 3)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
ARS ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
ARS ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
ARS ($)
Dec. 31, 2015
ARS ($)
SummaryOfFinancialRiskManagementLineItems [Line Items]                
Total loans $ 8,269,920   $ 6,294,433       $ 5,202,452 $ 6,224,330
Decrease in the profit (loss) due to a 1% increase in floating interest rates (4,241)   (2,098)          
Increase in the profit (loss) due to a 1% decrease in floating interest rates 4,241   2,098          
US dollar                
SummaryOfFinancialRiskManagementLineItems [Line Items]                
Total loans         $ 8,269,920 $ 6,294,433    
Fixed Rate                
SummaryOfFinancialRiskManagementLineItems [Line Items]                
Total loans 6,359,798   4,904,361          
Fixed Rate | US dollar                
SummaryOfFinancialRiskManagementLineItems [Line Items]                
Total loans         6,359,798 4,904,361    
Floating Rate                
SummaryOfFinancialRiskManagementLineItems [Line Items]                
Total loans $ 1,910,122   $ 1,390,072          
Floating Rate | US dollar                
SummaryOfFinancialRiskManagementLineItems [Line Items]                
Total loans         $ 1,910,122 $ 1,390,072    
Decrease in the profit (loss) due to a 1% increase in floating interest rates   $ (4,241)   $ (2,098)        
Increase in the profit (loss) due to a 1% decrease in floating interest rates   $ 4,241   $ 2,098