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Related Parties - Transactions And Balances With Key Management Personnel (Details) - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deposits [member] |  |  |
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items] |  |  |
Balances With Key Management Personnel | $ 88,640 | $ 119,835 |
Transactions with key management personnel | 26,352 | 1,149 | $ 2,146
Credit Cards [member] | Loans [member] |  |  |
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items] |  |  |
Balances With Key Management Personnel | 37,505 | 65,429 |
Transactions with key management personnel | 20,541 | 13,939 | 6,552
Overdrafts [member] | Loans [member] |  |  |
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items] |  |  |
Balances With Key Management Personnel | 0 | 6 |
Transactions with key management personnel | 15 | 50 | 0
Mortgage With Key Management Personnel [member] | Loans [member] |  |  |
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items] |  |  |
Balances With Key Management Personnel | 1,430 | 3,288 |
Transactions with key management personnel | $ 68,729 | $ 51,447 | $ 1,426

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- Definition Balances with key management personnel + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Transactions with key management personnel + References No definition available. + Details
Name: | bbar_TransactionsWithKeyManagementPersonnel
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | bbar_LoansAndDepositsAxis=bbar_DepositsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BusinessCombinationsAxis=bbar_CreditCardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | bbar_LoansAndDepositsAxis=bbar_LoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BusinessCombinationsAxis=bbar_OverdraftsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BusinessCombinationsAxis=bbar_MortgageWithKeyManagementPersonnelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |