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Financial assets at amortized cost - Loans and Advances to Financial Institutions (Details) - ARS ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Loans And Advances To Banks [Abstract] |  |
Loans and advances to financial institutions | $ 4,464,832 | $ 8,282,236
Allowances for ECL | (233,055) | (81,146)
TOTAL | $ 4,231,777 | $ 8,201,090

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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 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_LoansAndAdvancesToBanks
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant