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Financial liabilities at amortized cost - Bank Loans (Details) - ARS ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Financial Liabilities At Amortised Cost [Abstract] |  |
Local financial institutions | $ 156,920,724 | $ 55,330,406
Foreign financial institutions | 43,776,917 | 5,818,767
BCRA | 232,917 | 238,074
TOTAL | $ 200,930,558 | $ 61,387,247

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- Definition The amount of loans received from banks. + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Financial Liabilities At Amortised Cost [Abstract] + References No definition available. + Details
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- Definition Liabilities due to foreign financial institution. + References No definition available. + Details
Name: | bbar_LiabilitiesDueToForeignFinancialInstitution
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Liabilities due to local financial institution. + References No definition available. + Details
Name: | bbar_LiabilitiesDueToLocalFinancialInstitutions
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of liabilities due to central banks. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_LiabilitiesDueToCentralBanks
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant