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Financial assets at amortized cost - Summary of Debt securities (Details) - ARS ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Debt Securities [Abstract]
Government securities	$ 44,527,097	$ 43,956,008
Allowances for ECL	(6,709,331)	(5,274,721)
TOTAL	$ 37,817,766	$ 38,681,287

X

- Definition

Debt instruments held allowances for credit losses .

+ References

No definition available.

+ Details

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

X

- Definition

Debt instruments held gross .

+ References

No definition available.

+ Details

Name:	bbar_DebtInstrumentsHeldGross
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 2022-03-24
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard
-URIDate 2022-03-24

+ Details

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