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Financial assets at fair value through other comprehensive income - Debt securities FVOCI (Detail) - ARS ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Debt securities held fvoci [Abstract] |  |
BCRA Liquidity Bills | $ 107,693,328 | $ 135,681,602
Government securities | 53,372,170 | 45,966,011
Financial assets pledged as collateral | 4,614,463 | 10,475,296
Private securities - Corporate bonds | 1,359,517 | 393,822
TOTAL | $ 167,039,478 | $ 192,516,731

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