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Deposits guarantee regime - Additional Information (Detail) - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Deposits Guarantee Regime [Abstract] |  |
Contributions to the Deposits Guarantee Fund | $ 605,859 | $ 606,763
Percentage of Shares in SEDESA | 10.038% |

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- Definition The amount of other operating expenses for contributions to the deposits guarantee fund. + References No definition available. + Details
Name: | bbar_ContributionsToTheDepositsGuaranteeFund
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deposits guarantee regime. + References No definition available. + Details
Name: | bbar_DepositsGuaranteeRegimeAbstract
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The percent of shares in SEDESA. + References No definition available. + Details
Name: | bbar_PercentageOfSharesInSedesa
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration