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Minimum cash and minimum capital - minimum cash (Details) - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Minimum Cash [Line Items] |  |
BCRA – current account - not restricted | $ 358,900,596 | $ 502,282,567
BCRA – special guarantee accounts – restricted | 96,926,260 | 43,180,603
SUBTOTAL | 455,826,856 | 545,463,170
Others | 791,192 | 57,721,176
Liquidity Bills – BCRA | 60,435,133 | 1,505,491,903
SUBTOTAL | 838,835,635 | 1,701,873,043
TOTAL | 1,294,662,491 | 2,247,336,213
Bonds in pesos, 0.7% Baldar Private rate. Maturity 11-23-2027 [member] |  |
Minimum Cash [Line Items] |  |
Argentine Treasury Bonds in pesos | 14,771,877 | 37,662,724
Bonds in pesos. Maturity 05-23-2027 [member] |  |
Minimum Cash [Line Items] |  |
Argentine Treasury Bonds in pesos | 32,406,871 | 100,997,240
Bond in dual currency. Maturity 06-30-2024 [member] |  |
Minimum Cash [Line Items] |  |
Argentine Treasury Bonds In Pesos Based On Adjusted Interest Rate | 216,222,852 | 0
Bonds in pesos. Maturity 08-23-2025 [member] |  |
Minimum Cash [Line Items] |  |
Argentine Treasury Bonds In Pesos Based On Adjusted Interest Rate | 49,502,692 | 0
Bonds adjusted by 4.25% CER in pesos. Maturity 12-13-2024 [member] |  |
Minimum Cash [Line Items] |  |
Argentine Treasury Bonds In Pesos Based On Adjusted Interest Rate | 218,925,057 | 0
Bonds adjusted by 4% CER in pesos Maturity 10-14-2024 [member] |  |
Minimum Cash [Line Items] |  |
Argentine Treasury Bonds In Pesos Based On Adjusted Interest Rate | 189,705,541 | 0
Bonds adjusted by 4,25% CER in pesos Maturity 02-14-2025 [member] |  |
Minimum Cash [Line Items] |  |
Argentine Treasury Bonds In Pesos Based On Adjusted Interest Rate | $ 56,074,420 | $ 0

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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 Argentine treasury bonds in pesos based on adjusted interest rate. + References No definition available. + Details
Name: | bbar_ArgentineTreasuryBondsInPesosBasedOnAdjustedInterestRate
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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 Investment in other bonds. + References No definition available. + Details
Name: | bbar_InvestmentInOtherBonds
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

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- Definition Sub total balances at the argentine treasury bonds. + References No definition available. + Details
Name: | bbar_SubTotalBalancesAtTheArgentineTreasuryBonds
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_ArgentineTreasuryBondsInPesosAtBadlarPrivatedRateDueNovemberTwentyThirdTwoThousandAndTwentySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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