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Financial Instruments Risks (Details)	12 Months Ended
	Dec. 31, 2019
Disclosure of nature and extent of risks arising from financial instruments [abstract]
Confidence level of var	99.00%
Sensitivity Analysis Measurement Percentage	100.00%

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- Definition

The percent of confidence level of market risk metrics VAR to estimate the maximum loss expected.

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No definition available.

+ Details

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- Definition

Sensitivity Analysis, Measurement Percentage

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No definition available.

+ Details

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Namespace Prefix:	bbar_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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