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Financial Instruments Risks - Sensitivity of the Financial Margin SFM (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Sensitivity Of The Financial Margin Given A Variation Of 100 Basis Points In Projected Margin [Abstract] |  |
Closing | 0.92% | 0.82%
Minimum | 0.56% | 0.58%
Maximum | 0.92% | 2.20%
Average | 0.81% | 1.48%

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- Definition Average SFM given a variation of 100 basis points in relation to the 12 month projected margin. + References No definition available. + Details
Name: | bbar_AverageSfm
Namespace Prefix: | bbar_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Closing SFM given a variation of 100 basis points in relation to the 12 month projected margin. + References No definition available. + Details
Name: | bbar_ClosingSfm
Namespace Prefix: | bbar_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum SFM given a variation of 100 basis points in relation to the 12 month projected margin. + References No definition available. + Details
Name: | bbar_MaximumSfm
Namespace Prefix: | bbar_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum SFM given a variation of 100 basis points in relation to the 12 month projected margin. + References No definition available. + Details
Name: | bbar_MinimumSfm
Namespace Prefix: | bbar_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Sensitivity of the financial margin given a variation of 100 basis points in projected margin. + References No definition available. + Details
Name: | bbar_SensitivityOfTheFinancialMarginGivenAVariationOf100BasisPointsInProjectedMarginAbstract
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
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