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v3.21.1

Capital Stock - Summary of Bank's Subscribed and Paid-in Capital (Detail) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2019 Vote | Dec. 31, 2020 ARS ($) Vote shares | Dec. 31, 2019 ARS ($) shares | Dec. 31, 2018 ARS ($) Vote shares
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares | shares |  | 639,413,408 | 639,413,408 | 669,663,021
Decrease In Number Of Ordinary Shares | shares |  |  | (30,265,275) |
Increase In Number Of Ordinary Shares | shares |  |  | 15,662 |
Capital Stock, Issued and outstanding |  | $ 639,413 | $ 639,413 | $ 640,715
Increase in issued and outstanding |  |  | 15 |
Paid in capital stock |  | $ 639,413 | 639,413 | $ 669,663
Issued capital [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Own shares acquired |  |  | (1,317) |
Issued Capital in treasury [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Own shares acquired |  |  | 1,317 |
Capital Stock, Ending balance | shares |  |  |  | 28,948
Capital stock decrease in treasury |  |  | (30,265) |
Issued capital paid-in [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Decrease in paid in capital stock |  |  | (30,265) |
Increase in paid in capital stock |  |  | $ 15 |
Class A Ordinary Shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Votes per share | Vote |  | 5 |  | 5
Number of shares | shares |  | 11,235,670 |  | 11,235,670
Capital Stock, Issued and outstanding |  | $ 11,236 |  | $ 11,236
Paid in capital stock |  | $ 11,236 |  | $ 11,236
Class B Ordinary Shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Votes per share | Vote | 1 | 1 |  | 1
Number of shares | shares |  | 628,177,738 |  | 658,427,351
Capital Stock, Issued and outstanding |  | $ 628,177 |  | $ 629,479
Paid in capital stock |  | $ 628,177 |  | $ 658,427
Class B Ordinary Shares [member] | Issued Capital in treasury [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Capital Stock, Ending balance | shares |  |  |  | 28,948

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