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Change in business model and significant accounting policies - Additional Information (Detail) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Significant Accounting Policies [line items]      
Significant Influence About Associates between 20 and 50 percent    
Useful Lives of Buildings as informed in the technical appraisal as of January 1, 2017    
Useful Lives of Furniture and facilities 10 years    
Useful Lives of Equipment 3-5 years    
Useful Lives of Automobiles 5 years    
Useful Lives of Information Systems 5 years    
CPI 50.94% 36.14% 53.83%
Financial assets at fair value through profit or loss $ 10,616,675 $ 19,043,485  
Financial Assets At Amortised Cost 564,673,086 $ 526,958,019  
Change in Business Model [Member]      
Disclosure Of Significant Accounting Policies [line items]      
Reclassifaion from from measured at fair value through OCI to measured at to amortized cost 22,565,485    
Financial assets at fair value through profit or loss 22,084,903    
Financial Assets At Amortised Cost 480,582    
Default Amendment Change In Accounting Estimate [Member]      
Disclosure Of Significant Accounting Policies [line items]      
Increase (decrease) in accounting estimate $ 803,000    
Defaulted Exposure [Member]      
Disclosure Of Significant Accounting Policies [line items]      
Total Risk   40.00%  
Watch List Exposure [Member]      
Disclosure Of Significant Accounting Policies [line items]      
Total Risk 20.00%    
Investment funds [member]      
Disclosure Of Significant Accounting Policies [line items]      
Economic Interest Rate 37.00%