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Credit risk exposure and allowances - (Parenthetical) (Detail) - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of impairment loss and reversal of impairment loss [abstract] |  |
Credits recovered | $ 7,038,853 | $ 8,688,884

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- Definition The amount of credits recovered that is not include in tables about impairment of financial assets. + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfImpairmentLossAndReversalOfImpairmentLossAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration