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Financial assets at fair value through other comprehensive income - Debt securities FVOCI (Details) $ in Thousands, $ in Thousands | Dec. 31, 2023 ARS ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 ARS ($) | Dec. 31, 2022 USD ($)
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Debt securities held fvoci [Abstract] |  |  |  |  |
Government securities | [1] | $ 521,874,441 |  | $ 391,849,627 |
Financial assets pledged as collateral |  | 174,670,473 | $ 6,123,370 | 52,003,019 | $ 0
BCRA Internal Bills - USD |  |  | $ 69,772,109 |  | $ 6,619,055
BCRA Liquidity Bills |  | 60,484,996 |  | 1,460,167,050 |
Private securities - Corporate bonds |  | 8,959,190 |  | 11,593,436 |
TOTAL |  | $ 841,884,579 |  | $ 1,922,232,187 |
[1] | In march 2023, the Bank participated in a voluntary debt exchange under section 11, Decree No. 331/2022 issued by the Ministry of Economy. The securities delivered or received under such swap were as follows:

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- Definition The amount of Central Bank of the Argentine Republic bills pledged as collateral held by the entity. + References No definition available. + Details
Name: | bbar_BcraBillsPledgedAsCollateralFvoci
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of Central Bank of the Argentine Republic liquidity bills pledged as collateral held by the entity. + References No definition available. + Details
Name: | bbar_BcraLiquidityBillsFvoci
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of instruments of debt securities held by the entity at fair value through other comprehensive income. + References No definition available. + Details
Name: | bbar_DebtSecuritiesHeldFVOCI
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt securities held fvoci abstract + References No definition available. + Details
Name: | bbar_DebtSecuritiesHeldFvociAbstract
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financial asset pledged as collateral for liabilities or contingent liabilities. + References No definition available. + Details
Name: | bbar_FinancialAssetPledgedAsCollateralForLiabilitiesOrContingentLiabilities
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of government securities held by the entity. + References No definition available. + Details
Name: | bbar_GovernmentSecuritiesFvoci
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of debt investment securities by the entity that were issued by a corporate entity. + References No definition available. + Details
Name: | bbar_PrivateSecuritiesCorporateBondsFvoci
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant