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Financial assets at fair value through profit or loss - Derivative Financial Assets FVTPL - Foreign Currency Forward and Interest Rate Swap (Detail) - ARS ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Foreign Currency Forwards |  |
Foreign currency forward purchases - US$ | $ 1,011,403 | $ 618,497
Foreign currency forward sale - US$ | 978,794 | 620,956
Foreign currency forward sales - Euros | $ 6,834 | 1,804
Foreign currency forward purchases - Euros |  | 35
Interest rate swaps |  |
Fixed rate for floating rate |  | 1,500,050
Floating rate for fixed rate |  | $ 92,463

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- Definition Foreign Currency Forwards Notional Amount + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The notional amount of foreign currency forward purchases contracts in dollars held by the entity. + 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 Forwards Purchases Euro. + References No definition available. + Details
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- Definition The notional amount of foreign currency forward sales contracts in dollars held by the entity. + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Foreign Currency Forwards Sales Euro + References No definition available. + Details
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- Definition Interest Rate Swaps Notional Amount + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition The notional amount of interest rate swap contracts -receives fixed delivers variable - held by the entity. + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
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- Definition The notional amount of interest rate swap contracts -receives floating delivers fixed - held by the entity. + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant