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Minimum cash and minimum capital - Summary of Minimum Cash (Details) - ARS ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Minimum Cash [Line Items] |  |
BCRA – current account - not restricted | $ 757,637,118 | $ 781,551,804
BCRA – special guarantee accounts – restricted | 211,771,973 | 211,069,288
SUBTOTAL | 969,409,091 | 992,621,092
TOTAL | 3,132,205,265 | 2,819,292,633
Government securities in pesos - Measured at amortized cost |  |
Minimum Cash [Line Items] |  |
Minimum cash | 159,904,307 | 210,536,162
Government securities in pesos - Measured at fair value through OCI |  |
Minimum Cash [Line Items] |  |
Minimum cash | 2,002,891,867 | 1,013,677,345
Government securities in foreign currency – Measured at fair value through OCI |  |
Minimum Cash [Line Items] |  |
Minimum cash | 0 | 470,852,827
BCRA bills in pesos – Measured at fair value through OCI |  |
Minimum Cash [Line Items] |  |
Minimum cash | $ 0 | $ 131,605,207

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- Definition The minimum cash regulations establish the obligation to maintain liquidations in the unrestricted current account of the BCRA. + References No definition available. + Details
Name: | bbar_CurrentAccountNotRestrictedInTheBCRA
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Minimum Cash + References No definition available. + Details
Name: | bbar_MinimumCash
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Minimum cash [Line Item]. + References No definition available. + Details
Name: | bbar_MinimumCashLineItems
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The minimum cash regulations establish the obligation to maintain liquidation in the special guarantee accounts restricted in the BCRA. + References No definition available. + Details
Name: | bbar_SpecialGuaranteeAccountsRestrictedInTheBCRA
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The minimum cash amount that maintain in the argentine treasury bonds in pesos at fixed rate. + References No definition available. + Details
Name: | bbar_SubTotalBalancesAtTheBCRA
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Total minimum cash establish in the BCRA. + References No definition available. + Details
Name: | bbar_TotalMinimumCash
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | bbar_DebtInstrument1Axis=bbar_GovernmentSecuritiesAtAmortizedCostMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | bbar_DebtInstrument1Axis=bbar_GovernmentSecuritiesAtFairValueThroughOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | bbar_DebtInstrument1Axis=bbar_GovernmentSecuritiesInForeignCurrencyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bbar_DebtInstrument1Axis=bbar_CentralBankOfArgentinaBCRABillsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |