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Related Parties - Remuneration Of Key Management Personnel (Details) - ARS ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Key Management Personnel Compensation [Abstract]
Key Management Personnel Fees	$ 14,939	$ 28,287	$ 13,600
Key Management Personnel Compensation Total	$ 14,939	$ 28,287	$ 13,600

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- References

No definition available.

+ Details

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

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- Definition

Key management personnel fees

+ References

No definition available.

+ Details

Name:	bbar_KeyManagementPersonnelFees
Namespace Prefix:	bbar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2019-01-01
-Paragraph 17
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_17&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_KeyManagementPersonnelCompensation
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration