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Financial Liabilities At Amortised Cost - Bank Loans (Details) - ARS ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Bank Loans [Abstract]
Local Financial Institutions	$ 3,592,942	$ 0
Foreign Financial Institutions	2,539,186	8,487,730
Central Bank	16,748	15,394
Total Bank Loans	$ 6,148,876	$ 8,503,124

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- References

No definition available.

+ Details

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- Definition

The amount of loans received from banks.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Liabilities due to foreign financial institution.

+ References

No definition available.

+ Details

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Namespace Prefix:	bbar_
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- Definition

Liabilities due to local financial institution.

+ References

No definition available.

+ Details

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Namespace Prefix:	bbar_
Data Type:	xbrli:monetaryItemType
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- Definition

The amount of liabilities due to central banks.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard
-URIDate 2019-03-27

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Balance Type:	credit
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