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Financial assets at fair value through other comprehensive income - Debt securities FVOCI (Detail) - ARS ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt securities held fvoci [Abstract] |  |
BCRA Liquidity Bills | $ 29,076,683 | $ 20,834,239
Government securities | 16,031,680 | 15,099,605
Private securities - Corporate bonds | 70,150 | 174,058
BCRA Liquidity Bills - Pledged as collateral | 0 | 1,633,340
Government securities - Pledged as collateral | 0 | 24,667
TOTAL | $ 45,178,513 | $ 37,765,909

X
- 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 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 Governments investment pledged as collateral securities by the entity. + References No definition available. + Details
Name: | bbar_GovernmentSecuritiesPledgedAsCollateralFvoci
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