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v3.24.1.u1

Minimum cash and minimum capital - Minimum capital (Parenthetical) (Details) | 1 Months Ended
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Dec. 31, 2023
Minimum Capital [Abstract] |
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 + References No definition available. + Details
Name: | bbar_MinimumCapitalAbstract
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-types: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