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Financial assets at fair value through other comprehensive income - Debt securities FVOCI (Detail) - ARS ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Debt securities held fvoci [Abstract] |  |
BCRA Liquidity Bills | $ 89,890,131 | $ 39,585,142
Government securities | 30,452,845 | 21,825,609
Financial assets pledged as collateral | 6,939,966 |
Private securities - Corporate bonds | 260,910 | 95,503
TOTAL | $ 127,543,852 | $ 61,506,254

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