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v3.21.1

Restricted Assets - Additional Information (Details) - ARS ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Restricted Assets [Line Items] |  |
Other Restricted Assets | $ 17,912,856 | $ 8,064,219

X
- 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

X
- Definition Restricted assets. + References No definition available. + Details
Name: | bbar_RestrictedAssetsLineItems
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration