RESTRICTED ASSETS (Details) - ARS ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
RESTRICTED ASSETS
Special guarantee accounts in the Argentine Central Bank	$ 3,710,757	$ 2,887,162
Trust guarantee deposits		5,173
Guarantee deposits for currency forward transactions	601,248	2,865,356
Guarantee deposits for credit cards transactions	421,942	432,118
Other guarantee deposits	160,820	215,866
Guarantee deposits for repo transactions		32,510
Financial assets in guarantee	$ 4,894,767	$ 6,438,185

Loans and other financing restricted assets.

No definition available.

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

The amount of restricted assets in guarantee deposits for currency forward transactions.

No definition available.

Name:	supv_RestricedAssetsGuaranteeDepositsForCurrencyForwardTransactions
Namespace Prefix:	supv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of restricted assets in other guarantee deposits.

No definition available.

Name:	supv_RestricedAssetsOtherGuaranteeDeposits
Namespace Prefix:	supv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Trust guarantee deposits

No definition available.

Name:	supv_RestricedAssetsTrustGuaranteeDeposits
Namespace Prefix:	supv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of restricted assets in financial assets.

No definition available.

Name:	supv_RestrictedAssetsFinancialAssetsInGuarantee
Namespace Prefix:	supv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of restricted assets in guarantee deposits for credit cards transactions.

No definition available.

Name:	supv_RestrictedAssetsGuaranteeDepositsForCreditCardsTransactions
Namespace Prefix:	supv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of restricted assets in guarantee deposits for repo transactions.

No definition available.

Name:	supv_RestrictedAssetsGuaranteeDepositsForRepoTransactions
Namespace Prefix:	supv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of restricted assets special guarantee accounts in Central Bank.

No definition available.

Name:	supv_RestrictedAssetsSpecialGuaranteeAccountsInCentralBank
Namespace Prefix:	supv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant