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Minimum cash and minimum capital - Summary of Minimum Capital (Details) - ARS ($) $ in Thousands | 1 Months Ended | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Minimum Cash And Minimum Capital [Abstract] |  |  |
Credit risk |  | $ (724,705,937) | $ (483,634,440)
Operational risk |  | (253,936,068) | (197,092,938)
Market risk |  | (2,505,620) | (14,236,921)
Non-compliance |  | 0 | (38,120,704)
Total Capital under Central Bank rules |  | 2,298,928,651 | 2,483,906,175
Excess capital |  | $ 1,317,781,026 | $ 1,750,821,172
Period of non compliance for lending to non-financial sectors | 15 days |  |
Percentage on the excess relationship due to non-compliance |  | 100.00% |

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- Definition Minimum capital integration. + References No definition available. + Details
Name: | bbar_CapitalPaid
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Excess in paid capital. + References No definition available. + Details
Name: | bbar_ExcessInTheCapitalPaid
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Minimum capital required for credit risk. + References No definition available. + Details
Name: | bbar_MinimumCapitalForCreditRisk
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Minimum capital required by market risk. + References No definition available. + Details
Name: | bbar_MinimumCapitalForMarketRisk
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Minimum capital for non-compliance. + References No definition available. + Details
Name: | bbar_MinimumCapitalForNonCompliance
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Minimum capital required for operational risk. + References No definition available. + Details
Name: | bbar_MinimumCapitalForOperationalRisk
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Minimum cash and minimum capital. + References No definition available. + Details
Name: | bbar_MinimumCashAndMinimumCapitalAbstract
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage on the excess relationship due to non compliance. + References No definition available. + Details
Name: | bbar_PercentageOnTheExcessRelationshipDueToNonCompliance
Namespace Prefix: | bbar_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Period of non compliance for lending to non financial sectors. + References No definition available. + Details
Name: | bbar_PeriodOfNonComplianceForLendingToNonFinancialSectors
Namespace Prefix: | bbar_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration