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Restricted Assets - Additional Information (Details) - ARS ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Restricted Assets [Line Items] |  |
Other Restricted Assets | $ 5,923,453 | $ 7,234,836
Mercado De Valores De Buenos Aires S A Merval Shares [Member] |  |
Restricted Assets [Line Items] |  |
Restricted Shares |  | 38,030
BYMA [Member] |  |
Restricted Assets [Line Items] |  |
Restricted Shares |  | 145,525
Global Credit Program To Micro Small And Medium Companies [Member] |  |
Restricted Assets [Line Items] |  |
Treasury Bonds Investment Restricted | 86,369 |
Restricted National Treasury Bonds Adjusted by CER Maturing in Three Years | 82,809 | $ 121,966
Restricted National Treasury Bonds in US Dollars Maturing in Five Months | $ 108,000 |

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- Definition The amount of restricted accounts, deposits, and trusts applied as guarantee for activities related to credit card transactions, with automated clearing houses, transactions settled at maturity, foreign currency futures, court proceedings and leases. + References No definition available. + Details
Name: | bbar_OtherRestrictedAssets
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Restricted assets. + 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 The amount of restricted bonds held by the company, adjusted by CER in pesos and due on 2021. + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of restricted bonds held by the company in US dollars due on may 10, 2019. + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
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- Definition The amount of restricted shares as collateral granted by the entity. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Treasury bonds investment restricted + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |