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Repo Transactions - Additional Information (Detail) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of repo transactions [line items]      
Profit generated by the bank through repurchase transactions $ 7,067,389 $ 4,472,211 $ 942,142
Losses generated by the bank through reverse repurchase transactions 195,747 458,103 $ 457,876
Financial assets delivered as guarantee 695,748 1,466,345  
Financial assets off balance sheet transaction 44,338,930 1,648,337  
Government and Private securities [member]      
Disclosure of repo transactions [line items]      
Repurchase transactions 618,572 1,364,825  
Reverse repurchase transactions $ 39,421,705 $ 1,481,096