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ACCOUNTING STANDARDS AND BASIS OF PREPARATION - IAS 29 (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
ACCOUNTING STANDARDS AND BASIS OF PREPARATION |  |  |  |
Annual | 53.80% | 47.60% | 24.80% | 34.60%
Accumulated 3 years | 183.40% | 148.00% | 96.80% | 102.30%

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- Definition Accumulated consumer prices Index + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Consumer prices index. + References No definition available. + Details
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Namespace Prefix: | supv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Disclosure of significant accounting policies. + References No definition available. + Details
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Balance Type: | na
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