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RISK MANAGEMENT POLICIES - Sensitivity to reasonably possible additional variation in interest rates for next year (Details) - Interest rate risk [member] $ in Thousands	12 Months Ended
	Dec. 31, 2019 ARS ($)
Interest rate risk
Decrease in the interest rate	$ (357,394)
Increase in the interest rate	$ 260,313
Argentina, Pesos [member]
Interest rate risk
Decrease in the interest rate	4.00%
Increase in the interest rate	4.00%
US Dollar [member]
Interest rate risk
Decrease in the interest rate	2.00%
Increase in the interest rate	2.00%

X

- Definition

Decrease in market interest rates net income impact.

+ References

No definition available.

+ Details

Name:	supv_DecreaseInMarketInterestRatesNetIncomeImpact
Namespace Prefix:	supv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Disclosure Of Interest Rate Risk [line items].

+ References

No definition available.

+ Details

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

X

- Definition

Increase in market interest rates net income impact.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of reasonably possible decrease in interest rate

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of reasonably possible increase in interest rate

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_InterestRateRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CurrencyAxis=currency_ARS
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CurrencyAxis=currency_USD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: