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Financial Liabilities At Amortised Cost - Repurchase Agreements (Details) - ARS ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Repurchase Agreements [Abstract] |  |
Financial institutions | $ 0 | $ 22,030
Total Repurchase Agreements | $ 0 | $ 22,030

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- Definition Financial institutions repurchase agreements. + References No definition available. + Details
Name: | bbar_FinancialInstitutionsRepurchaseAgreements
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | bbar_RepurchaseAgreementsAbstract
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of instruments sold with the intent to reacquire in 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_RepurchaseAgreementsAndCashCollateralOnSecuritiesLent
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant