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Income Tax - Deferred income tax assets and liabilities (Detail) - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | $ (2,886,017) | $ (2,921,820)
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | $ 4,529,975 | (503,523) |
Other comprehensive income | 1,445,390 | 102,900 |
Impact of IFRS 9 Adoption |  | 478,248 |
Gain of control over subsidiaries | (65,690) |  |
Loss of control over subsidiaries |  | 9,102 | 36,161
Deferred tax assets | 3,023,658 | 0 |
Deferred tax liabilities | 0 | (2,886,017) |
Allowance for loans losses [member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | 1,854,136 | 989,796
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | 2,610,232 | 423,413 |
Impact of IFRS 9 Adoption |  | 478,248 |
Loss of control over subsidiaries |  | (37,321) |
Deferred tax assets | 4,464,368 | 1,854,136 |
Provisions [member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | 759,726 | 1,062,063
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | 1,269,558 | (297,876) |
Loss of control over subsidiaries |  | (4,461) |
Deferred tax assets | 2,029,284 | 759,726 |
Loan Commissions [member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | 288,579 | 446,159
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | (160,562) | (157,580) |
Deferred tax assets | 128,017 | 288,579 |
Expenses capitalized for tax purpose [member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | (613,366) | (488,565)
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | 407,777 | (124,801) |
Deferred tax assets |  | 0 |
Deferred tax liabilities | (205,589) | (613,366) |
Property and equipment [member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | (5,355,621) | (4,684,010)
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | (393,084) | (671,251) |
Loss of control over subsidiaries |  | (360) |
Deferred tax assets |  | 0 |
Deferred tax liabilities | (5,748,705) | (5,355,621) |
Investments in debt securities and equity instruments [member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | 162,098 | (272,197)
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | (3,654,867) | 331,395 |
Other comprehensive income | 1,445,390 | 102,900 |
Deferred tax assets |  | 162,098 |
Deferred tax liabilities | (2,047,379) |  |
Derivatives [member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | 17,231 | 25,441
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | (6,030) | (8,210) |
Deferred tax assets | 11,201 | 17,231 |
Inflation adjustment [member] |  |  |
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | 4,392,821 |  |
Deferred tax assets | 4,392,821 |  |
Others [Member] |  |  |
Disclosure of deferred taxes [Line Items] |  |  |
Deferred Taxes |  | 1,200 | $ (507)
Changes Recognized In [Abstract] |  |  |
Consolidated statement of profit or loss | 64,130 | 1,387 |
Gain of control over subsidiaries | (65,690) |  |
Loss of control over subsidiaries |  | 320 |
Deferred tax assets |  | $ 1,200 |
Deferred tax liabilities | $ (360) |  |

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