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Income Tax - Deferred income tax assets and liabilities (Detail) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of deferred taxes [Line Items]      
Deferred Taxes   $ 4,116,423 $ (3,929,038)
Changes Recognized In [Abstract]      
Consolidated statement of profit or loss $ 3,804,028 6,167,131  
Other comprehensive income (2,068,506) 1,967,761  
Gain of control over subsidiaries   (89,431)  
Consolidation with subsidiaries 28,626    
Deferred tax assets 16,085,389 15,010,431  
Offsetting (10,165,479) (10,894,008)  
Net deferred tax assets 5,919,910 4,116,423  
Deferred tax liabilities (10,204,818) (10,894,008)  
Offsetting 10,165,479 10,894,008  
Net deferred tax liabilities (39,339)    
Allowance for loans losses [member]      
Disclosure of deferred taxes [Line Items]      
Deferred Taxes   6,077,813 2,524,230
Changes Recognized In [Abstract]      
Consolidated statement of profit or loss (1,498,157) 3,553,583  
Consolidation with subsidiaries 2,109    
Deferred tax assets 4,581,765 6,077,813  
Provisions [member]      
Disclosure of deferred taxes [Line Items]      
Deferred Taxes   2,762,677 1,034,295
Changes Recognized In [Abstract]      
Consolidated statement of profit or loss (251,920) 1,728,383  
Deferred tax assets 2,510,757 2,762,678  
Loan Commissions [member]      
Disclosure of deferred taxes [Line Items]      
Deferred Taxes   174,283 392,873
Changes Recognized In [Abstract]      
Consolidated statement of profit or loss 100,877 (218,590)  
Deferred tax assets 275,160 174,283  
Expenses capitalized for tax purpose [member]      
Disclosure of deferred taxes [Line Items]      
Deferred Taxes   (279,890) (835,040)
Changes Recognized In [Abstract]      
Consolidated statement of profit or loss (564,566) 555,150  
Deferred tax liabilities (844,456) (279,890)  
Property and equipment [member]      
Disclosure of deferred taxes [Line Items]      
Deferred Taxes   (7,826,316) (7,291,169)
Changes Recognized In [Abstract]      
Consolidated statement of profit or loss 1,129,736 (535,147)  
Deferred tax liabilities (6,696,580) (7,826,316)  
Investments in debt securities and equity instruments [member]      
Disclosure of deferred taxes [Line Items]      
Deferred Taxes   (2,787,312) 220,681
Changes Recognized In [Abstract]      
Consolidated statement of profit or loss 2,168,490 (4,975,754)  
Other comprehensive income (2,068,506) 1,967,761  
Consolidation with subsidiaries 23,546    
Deferred tax liabilities (2,663,782) (2,787,312)  
Derivatives [member]      
Disclosure of deferred taxes [Line Items]      
Deferred Taxes   15,249 23,458
Changes Recognized In [Abstract]      
Consolidated statement of profit or loss (4,048) (8,209)  
Deferred tax assets 11,201 15,249  
Inflation adjustment [member]      
Disclosure of deferred taxes [Line Items]      
Deferred Taxes   5,980,408  
Changes Recognized In [Abstract]      
Consolidated statement of profit or loss 2,725,485 5,980,408  
Deferred tax assets 8,705,893 5,980,408  
Others [Member]      
Disclosure of deferred taxes [Line Items]      
Deferred Taxes   (489) $ 1,634
Changes Recognized In [Abstract]      
Consolidated statement of profit or loss (1,869) 87,307  
Gain of control over subsidiaries   (89,431)  
Consolidation with subsidiaries 2,971    
Deferred tax assets $ 613    
Deferred tax liabilities   $ (490)