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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

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- 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

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- 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

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- 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

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- 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

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- 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