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Financial Assets at Amortised Cost - Other Financial Assets (Details) - ARS ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Financial Assets [Abstract]
Financial assets pledged as collateral	$ 5,918,650	$ 5,576,829
Other Receivables	4,762,528	2,696,999
Receivable from financial institution for spot transactions pending settlement	253,523	10,525,742
Receivable from non-financial institution for spot transactions pending settlement	27,779	140,067
Others	161,406	847,055
Allowances for loan losses	(226,349)	(3)
TOTAL	$ 10,897,537	$ 19,786,689

X

- Definition

The amount of an allowance account used to record for bad debt risk.

+ References

No definition available.

+ Details

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- Definition

Other Financial Assets Abstract.

+ References

No definition available.

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X

- Definition

Other amounts receivable by the entity that it does not separately disclose in the same statement or note.

+ References

No definition available.

+ Details

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Namespace Prefix:	bbar_
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X

- Definition

Receivable from financial institution for spot transactions pending settlement.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Receivable from non-financial institution for spot transactions pending settlement.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 14
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_14_a&doctype=Standard
-URIDate 2019-03-27

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X

- Definition

The amount of financial assets that the entity does not separately disclose in the same statement or note. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
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- Definition

The amount receivable by the entity that it does not separately disclose in the same statement or note.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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