Provisions - Narrative (Details) $ in Thousands	Dec. 31, 2025 ARS ($) claim
Provisions [abstract]
Number of claims received \| claim	243
Estimate of undiscounted claims	$ 63,818
Estimated actual claims	$ 22,311

Estimated actual claims that arise from contracts results to outflow of funds contingent liabilities.

No definition available.

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