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Financial Instruments Risks - Concentration of Deposits (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
10 largest customers [member]    
Concentration of deposits [line items]    
Debt balance $ 10,875,308 $ 23,525,681
Percent of over total portfolio 3.70% 5.89%
50 following largest customers [member]    
Concentration of deposits [line items]    
Debt balance $ 17,030,642 $ 23,926,818
Percent of over total portfolio 5.79% 5.99%
100 following largest customers [member]    
Concentration of deposits [line items]    
Debt balance $ 13,414,450 $ 16,221,565
Percent of over total portfolio 4.56% 4.06%
Rest of customers [member]    
Concentration of deposits [line items]    
Debt balance $ 252,667,647 $ 335,534,953
Percent of over total portfolio 85.95% 84.06%
Total [member]    
Concentration of deposits [line items]    
Debt balance $ 293,988,047 $ 399,209,017
Percent of over total portfolio 100.00% 100.00%