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Financial instruments risks - Financial Assets and Liabilities Expected to be Collected or Paid Twelve Months After the Closing Date (Details) - ARS ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Financial assets |  |
Loans and advances | $ 2,863,140,161 | $ 1,218,676,198
Debt securities | 673,144,688 | 293,369,007
Other financial assets | 25,757,300 | 74,955,190
Total | 3,562,042,149 | 1,587,000,395
Financial liabilities |  |
Other financial liabilities | 23,930,280 | 48,125,310
Bank loans | 18,121,437 | 17,458,993
Deposits | 3,215 | 630,083
Debt securities | 6,341,854 | 0
Total | $ 48,396,786 | $ 66,214,386

X
- Definition The amount of loans received from banks expected to be paid twelve months after the end of the reporting period. + References No definition available. + Details
Name: | bbar_BankLoansReceivedExpectedToBePaidTwelveMonthsAfterTheEndOfTheReportingPeriod
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Securities To Be Paid Twelve Months After The End Of The Reporting Period + References No definition available. + Details
Name: | bbar_DebtSecuritiesToBePaidTwelveMonthsAfterTheEndOfTheReportingPeriod
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of deposit liabilities expected to be paid twelve months after the end of the reporting period. + References No definition available. + Details
Name: | bbar_DepositsExpectedToBePaidTwelveMonthsAfterTheEndOfTheReportingPeriod
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total amount of financial assets expected to be collected or paid twelve months after the end of the reporting period. + References No definition available. + Details
Name: | bbar_FinancialAssetsExpectedToBeCollected12MonthsAfterTheEndOfTheReporting
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financial assets to be collected breakdown. + References No definition available. + Details
Name: | bbar_FinancialAssetsToBeCollectedBreakdownAbstract
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total amount of financial liabilities expected to be paid twelve months after the end of the reporting period. + References No definition available. + Details
Name: | bbar_FinancialLiabilitiesExpectedToBePaid12MonthsAfterTheEndOfTheReporting
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financial liabilities to be paid breakdown. + References No definition available. + Details
Name: | bbar_FinancialLiabilitiesToBePaidBreakdownAbstract
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount investment securities expected to be collected twelve months after the end of the reporting period. + References No definition available. + Details
Name: | bbar_InvestmentSecuritiesExpectedToBeCollectedTwelveMonthsAfterTheEndOfTheReportingPeriod
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of non-derivative financial assets with fixed or determinable payments that are not quoted in an active market, expected to be collected twelve months after the end of the reporting period. + References No definition available. + Details
Name: | bbar_LoansAndReceivablesExpectedToBeCollectedTwelveMonthsAfterTheEndOfTheReportingPeriod
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Other financial assets expected to be collected 12 months after the end of the reporting. + References No definition available. + Details
Name: | bbar_OtherFinancialAssetsExpectedToBeCollected12MonthsAfterTheEndOfTheReporting
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of other financial liabilities expected to be paid twelve months after the end of the reporting period. + References No definition available. + Details
Name: | bbar_OtherFinancialLiabilitiesExpectedToBePaidTwelveMonthsAfterTheEndOfTheReportingPeriod
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant