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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, 2019 | Dec. 31, 2018
--- | --- | ---
Financial assets |  |
Loans and advances | $ 69,771,962 | $ 70,684,866
Debt securities | 175,629 | 11,203,612
Reverse repurchase agreements | 0 | 14,541,517
Total | 69,947,591 | 96,429,995
Financial liabilities |  |
Other financial liabilities | 4,144,530 | 1,313,978
Bank loans | 492,673 | 259,934
Debt securities issued | 136,306 | 781,130
Deposits | 94,603 | 60,599
Total | $ 4,868,112 | $ 2,415,641

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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
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
Name: | bbar_InvestmentSecuritiesExpectedToBeCollectedTwelveMonthsAfterTheEndOfTheReportingPeriod
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 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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- Definition The amount of financial assets that the entity does not separately disclose in the same statement or note, expected to be collected twelve months after the end of the reporting period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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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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Namespace Prefix: | bbar_
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Balance Type: | credit
Period Type: | instant