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Financial Instruments Risks - Summary of Guarantees and Loan Commitments (Detail) - ARS ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Summary of Guarantees and Loan Commitments [Abstract]
Financial guarantees and load commitments	$ 171,822,963	$ 220,023,853

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- Definition

The amount of financial guarantees and loan commitments issued, which may derived in outflows on demand.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

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- Definition

Summary of Guarantees and Loan Commitments

+ References

No definition available.

+ Details

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