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v3.21.1

Deposits guarantee regime - Additional Information (Detail) - ARS ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
May 01, 2020 | Feb. 28, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Deposits Guarantee Regime [Line Items] |  |  |  |
Contributions to the Deposits Guarantee Fund |  |  | $ 696,691 | $ 824,817
Percentage of Shares in SEDESA |  |  | 10.038 |
Bottom of range [member] |  |  |  |
Deposits Guarantee Regime [Line Items] |  |  |  |
Refund of guarantee amount |  |  | $ 450 |
Argentine Central Bank [member] |  |  |  |
Deposits Guarantee Regime [Line Items] |  |  |  |
Increase in contribution of deposits guarantee fund | $ 1,500 |  |  |
BCRA [member] | Bottom of range [member] |  |  |  |
Deposits Guarantee Regime [Line Items] |  |  |  |
Increase in contribution of deposits guarantee fund |  | $ 450 |  |
BCRA [member] | Top of range [member] |  |  |  |
Deposits Guarantee Regime [Line Items] |  |  |  |
Increase in contribution of deposits guarantee fund |  | $ 1,000 |  |

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- Definition The amount of other operating expenses for contributions to the deposits guarantee fund. + References No definition available. + Details
Name: | bbar_ContributionsToTheDepositsGuaranteeFund
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deposits Guarantee Regime [LineItem]. + References No definition available. + Details
Name: | bbar_DepositsGuaranteeRegimeLineItems
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Increase in contribution of deposits guarantee fund. + References No definition available. + Details
Name: | bbar_IncreaseInContributionOfDepositsGuaranteeFund
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The percent of shares in SEDESA. + References No definition available. + Details
Name: | bbar_PercentageOfSharesInSedesa
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refund of guarantee amount. + References No definition available. + Details
Name: | bbar_RefundOfGuaranteeAmount
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | bbar_SignificantInvestmentsInAssociates1Axis=bbar_ArgentineCentralBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | bbar_SignificantInvestmentsInAssociates1Axis=bbar_BCRAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |