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Financial assets at amortized cost (Details) - ARS ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value of Financial Assets Accepted as Collateral [Abstract]
Fair value of finacial assets accepted as collateral	$ 58,592,720	$ 299,260,885

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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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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