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RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS - Shareholders' equity under the rules of the Argentine Central Bank (Details) - ARS ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS        
Total shareholders' equity under the rules of the Argentine Central Bank $ 23,435,395 $ 26,102,395 $ 31,215,315 $ 18,538,127
Capital stock [member]        
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS        
Total shareholders' equity under the rules of the Argentine Central Bank 456,722 456,722 456,722 363,777
Paid-in capital [member]        
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS        
Total shareholders' equity under the rules of the Argentine Central Bank 24,360,438 24,359,953 24,360,624 10,481,557
Legal reserve [member]        
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS        
Total shareholders' equity under the rules of the Argentine Central Bank 140,517 140,517 111,921 76,599
Other reserves [member]        
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS        
Total shareholders' equity under the rules of the Argentine Central Bank 10,320,324 8,239,030 4,893,538 $ 3,012,409
Other comprehensive income [member]        
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS        
Total shareholders' equity under the rules of the Argentine Central Bank 395,630 $ 443,331 $ 72,100  
Argentine Central Bank [member]        
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS        
Total shareholders' equity under the rules of the Argentine Central Bank 21,680,037      
Argentine Central Bank [member] | Capital stock [member]        
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS        
Total shareholders' equity under the rules of the Argentine Central Bank 456,722      
Argentine Central Bank [member] | Paid-in capital [member]        
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS        
Total shareholders' equity under the rules of the Argentine Central Bank 8,997,297      
Argentine Central Bank [member] | Legal reserve [member]        
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS        
Total shareholders' equity under the rules of the Argentine Central Bank 91,344      
Argentine Central Bank [member] | Other reserves [member]        
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS        
Total shareholders' equity under the rules of the Argentine Central Bank 6,708,810      
Argentine Central Bank [member] | Other comprehensive income [member]        
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS        
Total shareholders' equity under the rules of the Argentine Central Bank 1,167,932      
Argentine Central Bank [member] | Net Income [Member]        
RESTRICTIONS IMPOSED ON THE DISTRIBUTION OF DIVIDENDS        
Total shareholders' equity under the rules of the Argentine Central Bank $ 4,257,932