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ACCOUNTING STANDARDS AND BASIS OF PREPARATION - Probabilities (Detail) | 12 Months Ended
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Dec. 31, 2019
Disclosure of Primary Macroeconomic Drivers of Credit Losses [line items] |
Probability of occurrences | 5.00%
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
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- Definition Scenario Weighted Using Probability Percentage + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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