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Financial Assets at Amortised Cost - Loans and Advances to Financial Institutions (Details) - ARS ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans And Advances To Banks [Abstract]
Loans and advances to financial institutions	$ 2,337,748	$ 7,076,612
Allowances for loan losses	(582,550)	(174,380)
TOTAL	$ 1,755,198	$ 6,902,232

X

- Definition

The amount of an allowance account used to loans and advances to financial institutions.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of Gross Loans and Advances to Financial Institutions.

+ References

No definition available.

+ Details

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

X

- Definition

Loans and advances to banks abstract.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of loans and advances the entity has made to banks.

+ 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_LoansAndAdvancesToBanks
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant