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Fee and Commission Income (Details) - ARS ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fee and commission income [abstract]
Linked to deposits	$ 12,013,206	$ 15,625,680	$ 15,320,959
Linked to credit cards	8,574,713	5,161,923	7,641,939
Insurance Agent Fee	1,437,672	1,545,159	1,817,747
From Foreign Currency Transactions	1,312,183	1,474,105	1,221,029
Linked to Securities	321,586	166,561	326,800
From Guarantees Granted	3,821	2,727	6,490
Total Fee and Commission Income	$ 23,663,181	$ 23,976,155	$ 26,334,964

X

- Definition

The amount of income relating to commissions from guarantees granted.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

The amount of income relating to commissions linked to securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	bbar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The amount of income relating to commissions for the hiring of insurance.

+ References

No definition available.

+ Details

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Namespace Prefix:	bbar_
Data Type:	xbrli:monetaryItemType
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X

- Definition

The amount of income relating to commissions from foreign currency transactions.

+ References

No definition available.

+ Details

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- Definition

Linked To Deposits

+ References

No definition available.

+ Details

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X

- Definition

The amount of income recognised from credit-related fees and commissions. [Refer: Fee and commission income]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2020-01-01

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X

- Definition

The amount of income relating to fees and commissions.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 85
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard
-URIDate 2020-01-01

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- References

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