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Income Tax - Deferred income tax assets and liabilities (Detail) - ARS ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | $ 4,116,423 | $ (3,929,038)
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | $ 3,804,028 | 6,167,131 |
Other comprehensive income | (2,068,506) | 1,967,761 |
Gain of control over subsidiaries |  | (89,431) |
Consolidation with subsidiaries | 28,626 |  |
Deferred tax assets | 16,085,389 | 15,010,431 |
Offsetting | (10,165,479) | (10,894,008) |
Net deferred tax assets | 5,919,910 | 4,116,423 |
Deferred tax liabilities | (10,204,818) | (10,894,008) |
Offsetting | 10,165,479 | 10,894,008 |
Net deferred tax liabilities | (39,339) |  |
Allowance for loans losses [member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | 6,077,813 | 2,524,230
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | (1,498,157) | 3,553,583 |
Consolidation with subsidiaries | 2,109 |  |
Deferred tax assets | 4,581,765 | 6,077,813 |
Provisions [member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | 2,762,677 | 1,034,295
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | (251,920) | 1,728,383 |
Deferred tax assets | 2,510,757 | 2,762,678 |
Loan Commissions [member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | 174,283 | 392,873
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | 100,877 | (218,590) |
Deferred tax assets | 275,160 | 174,283 |
Expenses capitalized for tax purpose [member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | (279,890) | (835,040)
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | (564,566) | 555,150 |
Deferred tax liabilities | (844,456) | (279,890) |
Property and equipment [member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | (7,826,316) | (7,291,169)
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | 1,129,736 | (535,147) |
Deferred tax liabilities | (6,696,580) | (7,826,316) |
Investments in debt securities and equity instruments [member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | (2,787,312) | 220,681
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | 2,168,490 | (4,975,754) |
Other comprehensive income | (2,068,506) | 1,967,761 |
Consolidation with subsidiaries | 23,546 |  |
Deferred tax liabilities | (2,663,782) | (2,787,312) |
Derivatives [member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | 15,249 | 23,458
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | (4,048) | (8,209) |
Deferred tax assets | 11,201 | 15,249 |
Inflation adjustment [member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | 5,980,408 |
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | 2,725,485 | 5,980,408 |
Deferred tax assets | 8,705,893 | 5,980,408 |
Others [Member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | (489) | $ 1,634
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | (1,869) | 87,307 |
Gain of control over subsidiaries |  | (89,431) |
Consolidation with subsidiaries | 2,971 |  |
Deferred tax assets | $ 613 |  |
Deferred tax liabilities |  | $ (490) |

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