Restricted assets - Narrative (Details) - ARS ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Restricted Availability Assets [Abstract]
Other restricted assets	$ 1,201,782,275	$ 609,025,348

The amount of restricted accounts, deposits, and trusts applied as guarantee for activities related to credit card transactions, with automated clearing houses, transactions settled at maturity, foreign currency futures, court proceedings and leases.

No definition available.

Name:	bbar_OtherRestrictedAssets1
Namespace Prefix:	bbar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant