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IFRS standards update - Additional Information (Detail)	Dec. 31, 2019 ARS ($)
IFRS 16 Lease [Member]
IFRS standards update [line items]
Right of use asset and lease liabilities	$ 2,839,825

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- Definition

IFRS standards update.

+ References

No definition available.

+ Details

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- Definition

Right of use asset and lease liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	bbar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: