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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, 2020	Dec. 31, 2019
Financial assets
Loans and advances	$ 77,442,142	$ 94,987,898
Debt securities	28,562,761	239,102
Total	106,004,903	95,227,000
Financial liabilities
Other financial liabilities	4,326,274	5,642,383
Bank loans	1,708,917	670,728
Debt securities issued	331,775	185,568
Deposits	20,630	128,793
Total	$ 6,387,596	$ 6,627,472

X

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

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_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Financial assets to be collected breakdown.

+ References

No definition available.

+ Details

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Namespace Prefix:	bbar_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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
Period Type:	instant

X

- Definition

Financial liabilities to be paid breakdown.

+ References

No definition available.

+ Details

Name:	bbar_FinancialLiabilitiesToBePaidBreakdownAbstract
Namespace Prefix:	bbar_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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
Balance Type:	debit
Period Type:	instant

X

- 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_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant