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Commissions Income - Summary of Commissions Income (Detail) - ARS ($) $ in Thousands | 12 Months Ended
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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

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- Definition The amount of income relating to fees and commissions. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard -URIDate 2020-01-01 + Details
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