Financial assets at amortized cost - Narrative (Details)	Dec. 31, 2023 ARS ($)
Financial Assets at Amortized Cost [Abstract]
Fair value of finacial assets accepted as collateral	$ 2,886,702,153

The fair value of financial assets accepted as collateral that the Group is permitted to sell or repledge in the absence of default.

No definition available.

Name:	bbar_FairValueOfFinancialAssetsAcceptedAsCollateral
Namespace Prefix:	bbar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant