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Financial Instruments Risks - Sensitivity of the Economic Value SEV (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Sensitivity Of The Economic Value Given A Variation Of 100 Basis Points [Abstract] |  |
Closing | 0.32% | 1.43%
Minimum | 0.04% | 1.01%
Maximum | 1.64% | 2.05%
Average | 0.77% | 1.61%

X
- 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