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Credit risk exposure and allowances - (Parenthetical) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 ARS ($)
Disclosure of impairment loss and reversal of impairment loss [abstract]
Credits recovered	$ 226,576

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- Definition

The amount of credits recovered that is not include in tables about impairment of financial assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	bbar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfImpairmentLossAndReversalOfImpairmentLossAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration