Acquisition-Date Percentage of Equity Interest in Acquiree held by Acquirer Immediately before Acquisition Date

No definition available.

Name:	bbar_AcquisitiondatePercentageOfEquityInterestInAcquireeHeldByAcquirerImmediatelyBeforeAcquisitionDate
Namespace Prefix:	bbar_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Capital And Reserves

+ References

No definition available.

+ Details

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

- Definition

Common Shares Issued, Voting Rights Per Share

+ References

No definition available.

+ Details

Name:	bbar_CommonSharesIssuedVotingRightsPerShare
Namespace Prefix:	bbar_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Distribution of dividend in nominal value.

+ References

No definition available.

+ Details

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

- Definition

Legal reserve is a percent of net income determined in accordance with BCRA accounting standards.

+ References

No definition available.

+ Details

Name:	bbar_PercentOfLegalReserve
Namespace Prefix:	bbar_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for dividends paid by the entity, classified as financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2019-01-01
-Paragraph 31
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_31&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_DividendsPaidClassifiedAsFinancingActivities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The increase (decrease) in the number of ordinary shares issued. [Refer: Ordinary shares [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The nominal value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 79
-Subparagraph a
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_79_a_iii&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_ParValuePerShare
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_BusinessCombinationsAxis=bbar_BbvaFrancsValoresSaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Capital and Reserves - Additional Information (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Oct. 09, 2019 shares $ / shares	Dec. 31, 2019 ARS ($)	Dec. 31, 2018 ARS ($)	Dec. 31, 2017 ARS ($)	Apr. 24, 2019 ARS ($)	Apr. 10, 2018 ARS ($)	Mar. 30, 2017 ARS ($)
Capital And Reserves [Line Items]
Percent of legal reserve		20.00%
Dividends paid \| $		$ 3,702,747	$ 2,010,520	$ 2,237,938
Distribution of dividend in nominal value \| $					$ 2,407,000	$ 970,000	$ 911,000
BBVA Francs Valores SA [Member]
Capital And Reserves [Line Items]
Par value per share issued \| $ / shares	$ 1
AcquisitionDate Percentage of Equity Interest in Acquiree held by Acquirer Immediately before Acquisition Date					95.00%
Number of shares issued \| shares	50,441
Common Shares Issued Voting Rights Per Share \| shares	1