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Minimum cash and minimum capital - Minimum capital (Parenthetical) (Details)	1 Months Ended
	Dec. 31, 2023
Minimum Capital [Abstract]
Period of non compliance for lending to non financial sectors	15 days
Percentage On The Excess Relationship Due To Non Compliance	100.00%

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- Definition

Minimum Capital

+ References

No definition available.

+ Details

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Namespace Prefix:	bbar_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Percentage on the excess relationship due to non compliance.

+ References

No definition available.

+ Details

Name:	bbar_PercentageOnTheExcessRelationshipDueToNonCompliance
Namespace Prefix:	bbar_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

Period of non compliance for lending to non financial sectors.

+ References

No definition available.

+ Details

Name:	bbar_PeriodOfNonComplianceForLendingToNonFinancialSectors
Namespace Prefix:	bbar_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration