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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, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€)
Foreign Currency Forward Transactions [Abstract] |  |  |  |
Foreign currency forward sales—US$ | $ | $ 620,956 |  | $ 760,615 |
Foreign currency forward purchases—US$ | $ | $ 618,497 |  | $ 620,651 |
Foreign currency forward sales—Euros | € |  | € 1,804 |  | € 5,463
Foreign currency forward purchases—Euros | € |  | € 35 |  | € 0

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- Definition Foreign currency forward purchase in Euros. + References No definition available. + Details
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Period Type: | duration

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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
Period Type: | duration

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- Definition Foreign currency forward sales in Euros. + References No definition available. + Details
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X
- 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
Period Type: | duration

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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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