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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

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

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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

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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
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 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
Balance Type:	debit
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