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Minimum cash and minimum capital - Narrative (Details)	12 Months Ended
	Dec. 31, 2024
Minimum Cash And Minimum Capital [Abstract]
Percentage of sum of credit-risk-weighted asset transactions	8.00%

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- Definition

The amount of minimum capital requirement for credit risk, percent of the sum of credit-risk-weighted asset transactions without delivery against payment.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- Definition

Minimum cash and minimum capital.

+ References

No definition available.

+ Details

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