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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of associates [line items]        
Total assets $ 999,299,463 $ 1,169,086,869    
Total liabilities 759,662,018 940,341,140    
Shareholders' equity 239,637,445 228,745,729 $ 217,948,890 $ 192,542,610
Associates [member]        
Disclosure of associates [line items]        
Total assets 88,898 88,980    
Total liabilities 12,608 18,332    
Shareholders' equity $ 76,290 $ 70,648    
Proportional Bank's interest 5.00% 5.00%    
Investment carrying amount $ 3,815 $ 3,532    
Play Digital SA [Member]        
Disclosure of associates [line items]        
Total assets 1,863,801 996,013    
Total liabilities 157,398 132,254    
Shareholders' equity $ 1,706,403 $ 863,759    
Proportional Bank's interest 10.0197% 9.9545%    
Investment carrying amount $ 170,976 $ 85,983