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Financial Instruments Risks - Progress of LCR Ratios (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Progress Of Lcr Ratios [Abstract]
LCR	413.00%	291.00%

X

- Definition

The relation between high quality liquid assets and total net cash outflows during a 30 day period.

+ References

No definition available.

+ Details

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

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- Definition

Progress of lcr ratios.

+ References

No definition available.

+ Details

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