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Financial Assets at Amortised Cost (Details) $ in Thousands | Dec. 31, 2018 ARS ($)
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Fair Value of Financial Assets Accepted as Collateral [Abstract] |
Fair value of finacial assets accepted as collateral | $ 40,227,389

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- Definition The fair value of financial assets accepted as collateral that the Group is permitted to sell or repledge in the absence of default. + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair Value of Financial Assets Accepted as Collateral Abstract. + References No definition available. + Details
Name: | bbar_FairValueOfFinancialAssetsAcceptedAsCollateralAbstract
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration