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Fair Value Quantitative and Qualitative Disclosures - Summary of Financial Assets and Liabilities Recognized at Fair Value using the Valuation Technique (Detail) - Level 3 [member] - Banks own assumptions [member] - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Fair Value Measurement Of Financial Assets And Liabilities Disaggregated By Valuation Technique [line items]    
Amount at the beginning $ 3,549,583 $ 95,095
Profit and loss 2,609,737 328,662
Recognition and derecognition 17,111 4,372,702
Monetary effects (967,987) (1,246,876)
Amount at end of the fiscal year 5,208,444 3,549,583
Debt securities [member]    
Disclosure Of Fair Value Measurement Of Financial Assets And Liabilities Disaggregated By Valuation Technique [line items]    
Amount at the beginning 1,109,626 2,703,786
Profit and loss 207,791 885,411
Amount at end of the fiscal year 378,444 1,109,626
Recognition and derecognition (791,555) (1,706,169)
Monetary effects (147,418) (773,402)
Other Financial Assets1 [member]    
Disclosure Of Fair Value Measurement Of Financial Assets And Liabilities Disaggregated By Valuation Technique [line items]    
Amount at the beginning 31,314 190,929
Profit and loss 9,472 18,737
Amount at end of the fiscal year 26,179 31,314
Recognition and derecognition (6,506) (143,266)
Monetary effects (8,101) (35,086)
Derivatives [member]    
Disclosure Of Fair Value Measurement Of Financial Assets And Liabilities Disaggregated By Valuation Technique [line items]    
Amount at the beginning 769,490  
Profit and loss 417,029  
Recognition and derecognition   769,490
Monetary effects (204,273)  
Amount at end of the fiscal year $ 982,246 $ 769,490