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Financial Instruments Risks - Sensitivity of the Economic Value SEV (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Sensitivity Of The Economic Value Given A Variation Of 100 Basis Points [Abstract] |  |
Closing | 0.38% | 0.32%
Minimum | 0.17% | 0.04%
Maximum | 0.47% | 1.64%
Average | 0.34% | 0.77%

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- Definition Average SEV given a variation of 100 basis points with respect to Core Capital. + References No definition available. + Details
Name: | bbar_AverageSev
Namespace Prefix: | bbar_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Closing SEV given a variation of 100 basis points with respect to Core Capital. + References No definition available. + Details
Name: | bbar_ClosingSev
Namespace Prefix: | bbar_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum SEV given a variation of 100 basis points with respect to Core Capital. + References No definition available. + Details
Name: | bbar_MaximumSev
Namespace Prefix: | bbar_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum SEV given a variation of 100 basis points with respect to Core Capital. + References No definition available. + Details
Name: | bbar_MinimumSev
Namespace Prefix: | bbar_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Sensitivity of the economic value given a variation of 100 basis points. + References No definition available. + Details
Name: | bbar_SensitivityOfTheEconomicValueGivenAVariationOf100BasisPointsAbstract
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration