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v3.22.1

Minimum cash and minimum capital - Minimum cash (Detail) - ARS ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Minimum Cash [Line Items] |  |
BCRA – current account - not restricted | $ 141,859,808,000 | $ 129,727,266,000
BCRA – special guarantee accounts – restricted | 7,297,680,000 | 6,873,561,000
SUBTOTAL BALANCES AT THE BCRA | 149,157,488,000 | 136,600,827,000
Liquidity Bills – BCRA | 107,693,328,000 | 135,674,610,000
TOTAL | 279,416,301,000 | 294,130,473,000
Bonds Due May 2022 |  |
Minimum Cash [Line Items] |  |
Argentine Treasury Bonds in pesos at fixed rate | $ 22,565,485,000 | $ 21,855,036,000

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

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