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Financial Assets at Amortised Cost - Other Financial Assets (Details) - ARS ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Financial Assets [Abstract]
Financial assets pledged as collateral	$ 10,972,890	$ 8,057,680
Other receivables	8,776,296	6,483,728
Receivable from financial institution for spot transactions pending settlement	1,114,396	345,148
Receivable from non-financial institution for spot transactions pending settlement	104,249	37,818
Others	137,905	219,741
Allowances for loan losses	(264,371)	(308,153)
TOTAL	$ 20,841,365	$ 14,835,962

X

- Definition

The amount of an allowance account used to record for bad debt risk.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Other Financial Assets Abstract.

+ References

No definition available.

+ Details

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

X

- Definition

Other amounts receivable by the entity that it does not separately disclose in the same statement or note.

+ References

No definition available.

+ Details

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Namespace Prefix:	bbar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Receivable from financial institution for spot transactions pending settlement.

+ References

No definition available.

+ Details

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

X

- Definition

Receivable from non-financial institution for spot transactions pending settlement.

+ References

No definition available.

+ Details

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Namespace Prefix:	bbar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 14
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_14_a&doctype=Standard
-URIDate 2020-01-01

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

X

- Definition

The amount of financial assets that the entity does not separately disclose in the same statement or note. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 54
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_d&doctype=Standard
-URIDate 2020-01-01

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- Definition

The amount receivable by the entity that it does not separately disclose in the same statement or note.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
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