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FAIR VALUES - Fair value of financial instruments (Details) - Fair value [member] - ARS ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | $ 111,401,234 | $ 79,640,330
Financial liabilities | 25,064,048 | 14,083,803
Debt Securities At Fair Value Through Profit Or Loss [Member] |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 19,757,685 | 14,900,812
Derivatives |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 221,858 | 217,271
Other financial assets |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 12,378,608 | 5,143,926
Other Debt Securities |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 70,693,658 | 52,127,363
Financial assets in guarantee [member] |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 8,085,145 | 7,075,371
Investments in Equity Instruments |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 264,280 | 175,587
Liabilities at fair value through profit or loss |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial liabilities | 2,053,216 | 3,021,859
Derivatives |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial liabilities |  | 3,011
Other financial liabilities |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial liabilities | 23,010,832 | 11,058,933
Level 1 of fair value hierarchy [member] |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 53,693,887 | 36,697,507
Financial liabilities | 25,064,048 | 14,083,803
Level 1 of fair value hierarchy [member] | Debt Securities At Fair Value Through Profit Or Loss [Member] |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 19,446,167 | 14,539,804
Level 1 of fair value hierarchy [member] | Derivatives |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 221,858 | 217,271
Level 1 of fair value hierarchy [member] | Other financial assets |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 12,378,608 | 5,143,926
Level 1 of fair value hierarchy [member] | Other Debt Securities |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 13,405,096 | 9,589,618
Level 1 of fair value hierarchy [member] | Financial assets in guarantee [member] |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 8,085,145 | 7,075,371
Level 1 of fair value hierarchy [member] | Investments in Equity Instruments |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 157,013 | 131,517
Level 1 of fair value hierarchy [member] | Liabilities at fair value through profit or loss |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial liabilities | 2,053,216 | 3,021,859
Level 1 of fair value hierarchy [member] | Derivatives |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial liabilities |  | 3,011
Level 1 of fair value hierarchy [member] | Other financial liabilities |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial liabilities | 23,010,832 | 11,058,933
Level 2 of fair value hierarchy [member] |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 57,600,080 | 42,898,753
Level 2 of fair value hierarchy [member] | Debt Securities At Fair Value Through Profit Or Loss [Member] |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 311,518 | 361,008
Level 2 of fair value hierarchy [member] | Other Debt Securities |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 57,288,562 | 42,537,745
Level 3 of fair value hierarchy [member] |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | 107,267 | 44,070
Level 3 of fair value hierarchy [member] | Investments in Equity Instruments |  |
Disclosure of fair value measurement of assets and liability [line items] |  |
Financial assets | $ 107,267 | $ 44,070

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