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Financial liabilities at fair value through profit or loss -Trading liabilities FVTPL (Details) $ in Thousands	Dec. 31, 2019 ARS ($)
Trading Liabilities [Abstract]
Short Sold Positions	$ 790,707
Total Liabilities	$ 790,707

X

- Definition

Short sold positions.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of short sold positions.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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