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Capital Management, Corporate Governance Transparency Policy and Risk Management - Summary of Banks's Shareholders (Detail)
 12 Months Ended
Oct. 01, 2021
Dec. 31, 2021
Disclosure of ownership structure of shareholders [line items]    
Participating Interest 24.99%  
Carballo Delfin Jorge Ezequiel [member]    
Disclosure of ownership structure of shareholders [line items]    
Participating Interest   17.47%
Voting Interest   19.19%
ANSES FGS Law No. 26425 [member]    
Disclosure of ownership structure of shareholders [line items]    
Participating Interest   28.80%
Voting Interest   26.91%
Grouped shareholders (Local Stock Exchanges) [member]    
Disclosure of ownership structure of shareholders [line items]    
Participating Interest   10.36%
Voting Interest   9.87%
Grouped shareholders (Foreign stock exchanges) [member]    
Disclosure of ownership structure of shareholders [line items]    
Participating Interest   26.09%
Voting Interest   24.38%
Fideicomiso de Garantía JHB BMA    
Disclosure of ownership structure of shareholders [line items]    
Participating Interest   17.28%
Voting Interest   19.65%