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Financial assets at fair value through profit or loss - Summary of Debt Securities (Details) - ARS ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Financial assets at fair value through profit or loss [abstract] |  |
Government securities | $ 91,797,177 | $ 487,641,727
Private securities - Corporate bonds | 0 | 4,682,554
TOTAL | $ 91,797,177 | $ 492,324,281

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- Definition The amount of debt securities held by the entity. + References No definition available. + Details
Name: | bbar_DebtSecuritiesHeld
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of government securities held by the entity. + References No definition available. + Details
Name: | bbar_GovernmentSecurities
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of private securities corporate bonds held by the entity. + References No definition available. + Details
Name: | bbar_PrivateSecuritiesCorporateBonds
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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