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Financial assets at amortized cost - Loans and Advances to Financial Institutions (Details) - ARS ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Loans And Advances To Banks [Abstract] |  |
Loans and advances to financial institutions | $ 16,432,085 | $ 13,903,746
Allowances for ECL | (980,641) | (725,747)
TOTAL | $ 15,451,444 | $ 13,177,999

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- 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

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- 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

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- 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

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- 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 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_LoansAndAdvancesToBanks
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant