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Financial assets at fair value through profit or loss - Debt Securities FVTPL (Detail) - ARS ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities Held [Abstract] |  |
Government securities | $ 915,323 | $ 70,617
Private securities - Corporate bonds | 27,438 | 127,432
BCRA Liquidity Bills |  | 5,424,513
TOTAL | $ 942,761 | $ 5,622,562

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

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

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

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

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