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Financial Instruments Risks - Forward Transactions and Foreign Currency Forward (Details) € in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€)
Foreign Currency Forward Transactions [Abstract] |  |  |  |
Foreign currency forward purchases—US$ | $ | $ 1,011,403 |  | $ 618,497 |
Foreign currency forward sales—US$ | $ | 978,794 |  | 620,956 |
Foreign currency forward sales—Euros | € |  | € 6,834 |  | € 1,804
Foreign currency forward purchases—Euros | € |  |  |  | 35
Foreign currency forward - US$ | $ | $ 32,609 |  | $ (2,459) |
Foreign currency forward - Euros | € |  | € 6,834 |  | € 1,769

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- Definition Foreign currency forward purchase in Euros. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Foreign currency forward purchases in US Dollars. + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Foreign currency forward sales in Euros. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Foreign currency forward sales in US Dollars. + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Foreign currency forward transactions. + References No definition available. + Details
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Namespace Prefix: | bbar_
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- Definition Net foreign currency forward purchases sales. + References No definition available. + Details
Name: | bbar_NetForeignCurrencyForwardPurchasesSales
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition NetForeignCurrencyForwardPurchasesSales + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration