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Commissions Income - Summary of Commissions Income (Detail) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fee and commission income [line items]      
Fee and commission income $ 24,742,767 $ 26,467,679 $ 29,951,869
Performance obligations satisfied at point in time [member] | Commissions related to obligations [member]      
Disclosure of fee and commission income [line items]      
Fee and commission income 12,993,348 15,155,762 17,940,508
Performance obligations satisfied at point in time [member] | Commissions related to credit cards [member]      
Disclosure of fee and commission income [line items]      
Fee and commission income 8,410,516 8,075,227 8,885,346
Performance obligations satisfied at point in time [member] | Commissions related to insurance [member]      
Disclosure of fee and commission income [line items]      
Fee and commission income 1,601,339 1,591,978 1,766,846
Performance obligations satisfied at point in time [member] | Commissions related to trading and foreign exchange transactions [member]      
Disclosure of fee and commission income [line items]      
Fee and commission income 536,763 620,678 567,002
Performance obligations satisfied at point in time [member] | Commissions related to securities value[member]      
Disclosure of fee and commission income [line items]      
Fee and commission income 544,485 371,863 218,240
Performance obligations satisfied at point in time [member] | Commissions related to loans and other financing [member]      
Disclosure of fee and commission income [line items]      
Fee and commission income 183,726 217,173 185,144
Performance obligations satisfied at point in time [member] | Commissions related to financial guarantees granted [member]      
Disclosure of fee and commission income [line items]      
Fee and commission income 1,159 5,408 857
Performance obligations satisfied over time [member] | Commissions related to obligations [member]      
Disclosure of fee and commission income [line items]      
Fee and commission income 843 3,873 11,491
Performance obligations satisfied over time [member] | Commissions related to credit cards [member]      
Disclosure of fee and commission income [line items]      
Fee and commission income 427,955 361,896 320,505
Performance obligations satisfied over time [member] | Commissions related to trading and foreign exchange transactions [member]      
Disclosure of fee and commission income [line items]      
Fee and commission income 41,900 46,232 41,922
Performance obligations satisfied over time [member] | Commissions related to loans and other financing [member]      
Disclosure of fee and commission income [line items]      
Fee and commission income 732 14,562 11,986
Performance obligations satisfied over time [member] | Commissions related to financial guarantees granted [member]      
Disclosure of fee and commission income [line items]      
Fee and commission income $ 1 $ 3,027 $ 2,022