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Financial Assets at Amortised Cost - Summary of Debt securities (Details) - ARS ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Debt Securities [Abstract]
Government securities	$ 22,565,485
Allowances for credit losses	(2,707,858)
TOTAL	$ 19,857,627

X

- Definition

Debt instruments held allowances for credit losses .

+ References

No definition available.

+ Details

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

X

- Definition

Debt instruments held gross .

+ References

No definition available.

+ Details

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

X

- Definition

Disclosure of debt securities .

+ References

No definition available.

+ Details

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

X

- Definition

The amount of instruments representing indebtedness held by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard
-URIDate 2021-03-24

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant