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Financial Liabilities At Amortised Cost - Repurchase Agreements (Details) - ARS ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Repurchase Agreements [Abstract]
Financial institutions	$ 0	$ 22,030
Total Repurchase Agreements	$ 0	$ 22,030

X

- Definition

Financial institutions repurchase agreements.

+ References

No definition available.

+ Details

Name:	bbar_FinancialInstitutionsRepurchaseAgreements
Namespace Prefix:	bbar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

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- Definition

The amount of instruments sold with the intent to reacquire in repurchase agreements and cash collateral on securities lent.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_RepurchaseAgreementsAndCashCollateralOnSecuritiesLent
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant