Capital and Reserves - Narrative (Details)	12 Months Ended
Dec. 31, 2025
Capital and reserves [Abstract]
Percent of legal reserve	20.00%

Legal reserve is a percent of net income determined in accordance with BCRA accounting standards.

No definition available.

Name:	bbar_PercentOfLegalReserve
Namespace Prefix:	bbar_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration