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Investments in Associates and Joint Arrangements - Summarized Financial Information on the Bank's Investment in Associate (Detail) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of associates [line items]        
Total assets $ 774,529,063 $ 606,152,201    
Total Liabilities 622,983,252 461,759,370    
Shareholders' equity 151,545,811 144,392,831 $ 127,560,957 $ 149,654,925
Associates [member]        
Disclosure of associates [line items]        
Total assets 58,950 42,826    
Total Liabilities 12,145 10,714    
Shareholders' equity $ 46,805 $ 32,112    
Proportional Bank's interest 5.00% 5.00%    
Investment carrying amount $ 2,340 $ 1,606    
Play Digital SA [Member]        
Disclosure of associates [line items]        
Total assets 659,866      
Total Liabilities 87,619      
Shareholders' equity $ 572,247      
Proportional Bank's interest 9.9545%      
Investment carrying amount $ 56,964