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Financial assets at fair value through profit or loss - Derivative Financial Assets FVTPL (Detail) - ARS ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivative Financial Assets [Abstract]
Foreign Currency Forwards	$ 2,695,749	$ 3,209,511
Put Options - Prisma Medios de Pago S.A	1,182,000	932,562
Interest Rate Swaps		6,175
TOTAL	$ 3,877,749	$ 4,148,248

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- Definition

Derivative Financial Assets

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

The amount of foreign currency forward contracts held by the entity.

+ References

No definition available.

+ Details

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

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- Definition

Put options.

+ References

No definition available.

+ Details

Name:	bbar_PutOptions
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

The amount of interest rate swap contracts held by the entity.

+ References

No definition available.

+ Details

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

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- Definition

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ 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

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Period Type:	instant