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Financial Assets at Amortised Cost - Reverse Repurchase Agreements (Details) - ARS ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Reverse Repurchase Agreements [Abstract]
Financial institutions		$ 238,060
Argentine government		19,546,503
Allowances for loan losses		(218,419)
TOTAL	$ 0	$ 19,566,144

X

- Definition

The amount of an allowance account used to reverse repurchase agreements.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of reverse repurchase agreements entered into with the argentine government.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of reverse repurchase agreements entered into with financial institutions.

+ References

No definition available.

+ Details

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

X

- Definition

Reverse repurchase agreements abstract.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of instruments purchased for resale in reverse repurchase agreements and cash collateral on securities borrowed. [Refer: Repurchase agreements and cash collateral on securities lent]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_ReverseRepurchaseAgreementsAndCashCollateralOnSecuritiesBorrowed
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant