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Financial Assets at Amortised Cost - Reverse Repurchase Agreements (Details) $ in Thousands	Dec. 31, 2020 ARS ($)
Reverse Repurchase Agreements [Abstract]
BCRA repos	$ 49,187,908
Allowances for loan losses	(500,941)
TOTAL	$ 48,686,967

X

- Definition

The amount of an allowance account used to reverse repurchase agreements.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of reverse repurchase agreements entered into with the central bank.

+ References

No definition available.

+ Details

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

X

- Definition

Reverse repurchase agreements abstract.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of instruments purchased for resale in reverse repurchase agreements and cash collateral on securities borrowed. [Refer: Repurchase agreements and cash collateral on securities lent]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard
-URIDate 2020-01-01

+ Details

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