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Minimum cash and minimum capital - Minimum cash (Detail) - ARS ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Minimum Cash [Line Items] |  |
BCRA – current account - not restricted | $ 85,945,337,000 | $ 146,289,273,000
BCRA – special guarantee accounts – restricted | 4,553,788,000 | 3,849,897,000
SUBTOTAL BALANCES AT THE BCRA | 90,499,125,000 | 150,139,170,000
Liquidity Bills – BCRA | 89,885,499,000 | 45,009,654,000
TOTAL | 194,863,757,000 | 205,087,380,000
Bonds Due May 2022 |  |
Minimum Cash [Line Items] |  |
Argentine Treasury Bonds in pesos at fixed rate | $ 14,479,133,000 |
Bonds Due November 2020 |  |
Minimum Cash [Line Items] |  |
Argentine Treasury Bonds in pesos at fixed rate |  | $ 9,938,556,000

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- Definition The minimum cash amount that maintain in the liquidity bills in BCRA. + References No definition available. + Details
Name: | bbar_ArgentineTreasuryBondsInPesosAtFixedRate
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The minimum cash regulations establish the obligation to maintain liquidations in the unrestricted current account of the BCRA. + References No definition available. + Details
Name: | bbar_CurrentAccountNotRestrictedInTheBcra
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of balances at the BCRA. + References No definition available. + Details
Name: | bbar_LiquidityBillsBcra
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Minimum cash [Line Item]. + References No definition available. + Details
Name: | bbar_MinimumCashLineItems
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The minimum cash regulations establish the obligation to maintain liquidation in the special guarantee accounts restricted in the BCRA. + References No definition available. + Details
Name: | bbar_SpecialGuaranteeAccountsRestrictedInTheBcra
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The minimum cash amount that maintain in the argentine treasury bonds in pesos at fixed rate. + References No definition available. + Details
Name: | bbar_SubTotalBalancesAtTheBcra
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total minimum cash establish in the BCRA. + References No definition available. + Details
Name: | bbar_TotalMinimumCash
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | bbar_DebtInstrumentAxis=bbar_BondsDueMayTwoThousandTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | bbar_DebtInstrumentAxis=bbar_BondsDueNovemberTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |