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ACCOUNTING STANDARDS AND BASIS OF PREPARATION - Probabilities (Detail)	12 Months Ended
	Dec. 31, 2020
Scenario one [member]
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]
Probability of occurrences	80.00%
Scenario Two [member]
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]
Probability of occurrences	10.00%
Scenario Three [member]
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]
Probability of occurrences	10.00%

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- Definition

Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items]

+ References

No definition available.

+ Details

Name:	supv_DisclosureOfPrimaryMacroeconomicDriversOfCreditLossesLineItems
Namespace Prefix:	supv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Scenario Weighted Using Probability Percentage

+ References

No definition available.

+ Details

Name:	supv_ScenarioWeightedUsingProbabilityPercentage
Namespace Prefix:	supv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	srt_StatementScenarioAxis=supv_ScenarioOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=supv_ScenarioTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=supv_ScenarioThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: