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v3.21.1

Related Parties - Transactions And Balances With Key Management Personnel (Details) - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Deposits Member |  |  |
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items] |  |  |
Balances With Key Management Personnel | $ 32,673 | $ 25,133 |
Transactions with key management personnel | 1,075 | 1,628 | $ 338
Credit Cards Member | Loans Member |  |  |
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items] |  |  |
Balances With Key Management Personnel | 4,975 | 6,287 |
Transactions with key management personnel | 1,131 | 1,484 | 2,061
Overdrafts Member | Loans Member |  |  |
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items] |  |  |
Balances With Key Management Personnel | 30 | 5 |
Transactions with key management personnel |  |  | 20
Mortgage With Key Management Personnel Member | Loans Member |  |  |
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items] |  |  |
Balances With Key Management Personnel | 1,190 | 1,713 |
Transactions with key management personnel | $ 255 | $ 378 | $ 606

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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
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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: |
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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
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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: |