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COMPOSITION OF THE MAIN ITEMS OF THE CONSOLIDATED STATEMENT OF FINANCIAL POSITION AND CONSOLIDATED INCOME STATEMENT - Service fee expenses (Details) - ARS ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
COMPOSITION OF THE MAIN ITEMS OF THE CONSOLIDATED STATEMENT OF FINANCIAL POSITION AND CONSOLIDATED INCOME STATEMENT
Commissions paid	$ 3,469,846	$ 2,955,840	$ 2,858,035
Export and foreign currency operations	78,423	99,114	112,035
Total	$ 3,548,269	$ 3,054,954	$ 2,970,070

X

- Definition

The amount of expense 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

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Commission paid expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	supv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

n/a

+ References

No definition available.

+ Details

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Namespace Prefix:	supv_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Export and foreign currency operations commission expense

+ References

No definition available.

+ Details

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Namespace Prefix:	supv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration