Financial assets at fair value through profit or loss - Debt Securities FVTPL (Detail) - ARS ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities Held [Abstract]
Government securities	$ 1,396,145	$ 1,381,603
Private securities - Corporate bonds	780	41,415
TOTAL	$ 1,396,925	$ 1,423,018

The amount of private securities corporate bonds held by the entity.

No definition available.

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