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Financial Instruments Risks - Financial Assets and Liabilities Expected to be Collected or Paid Twelve Months After the Closing Date (Details) - ARS ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financial assets |  |
Loans and advances | $ 103,553,098 | $ 116,892,408
Debt securities | 25,149,891 | 43,113,087
Other financial assets | 7,902,076 |
Total | 136,605,065 | 160,005,495
Financial liabilities |  |
Other financial liabilities | 4,311,667 | 6,530,148
Bank loans | 2,576,621 | 2,579,467
Debt securities issued | 100,595 | 500,786
Deposits | 25,213 | 31,139
Total | $ 7,014,096 | $ 9,641,540

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- Definition The amount of loans received from banks expected to be paid twelve months after the end of the reporting period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of debt instruments issued expected to be paid twelve months after the end of the reporting period. + References No definition available. + Details
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Namespace Prefix: | bbar_
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X
- Definition Total amount of financial assets expected to be collected or paid twelve months after the end of the reporting period. + References No definition available. + Details
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Namespace Prefix: | bbar_
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- Definition Financial assets to be collected breakdown. + References No definition available. + Details
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- Definition Total amount of financial liabilities expected to be paid twelve months after the end of the reporting period. + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Financial liabilities to be paid breakdown. + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The amount investment securities expected to be collected twelve months after the end of the reporting period. + References No definition available. + Details
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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of non-derivative financial assets with fixed or determinable payments that are not quoted in an active market, expected to be collected twelve months after the end of the reporting period. + References No definition available. + Details
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- Definition Other financial assets expected to be collected 12 months after the end of the reporting. + References No definition available. + Details
Name: | bbar_OtherFinancialAssetsExpectedToBeCollected12MonthsAfterTheEndOfTheReporting
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The amount of other financial liabilities expected to be paid twelve months after the end of the reporting period. + References No definition available. + Details
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Namespace Prefix: | bbar_
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Balance Type: | credit
Period Type: | instant

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- Definition The amount of deposit liabilities expected to be paid twelve months after the end of the reporting period. + References No definition available. + Details
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