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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, 2022 | Dec. 31, 2021
--- | --- | ---
Financial assets |  |
Loans and advances | $ 219,396,127 | $ 201,714,290
Debt securities | 1,683,443,548 | 48,990,253
Other financial assets | 7,576,707 | 15,392,699
Total | 1,910,416,382 | 266,097,242
Financial liabilities |  |
Other financial liabilities | 5,915,713 | 8,398,830
Bank loans | 2,388,669 | 5,019,080
Debt securities issued | 0 | 195,952
Deposits | 77,673 | 49,113
Total | $ 8,382,055 | $ 13,662,975

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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

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- 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_
Data Type: | xbrli:monetaryItemType
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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
Name: | bbar_FinancialLiabilitiesExpectedToBePaid12MonthsAfterTheEndOfTheReporting
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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Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
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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_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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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Namespace Prefix: | bbar_
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