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Earnings per share - Table of Earnings Per Share (Detail) - ARS ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Numerator: |  |  |  |
Profit (Loss) Attributable To owners Of The Bank |  | $ 10,051,035 | $ 21,819,964 | $ (3,119,918)
Profit (Loss) attributable to owners of the Bank adjusted to reflect the effect of dilution |  | $ 10,051,035 | $ 21,819,964 | $ (3,119,918)
Denominator: |  |  |  |
Weighted average of outstanding ordinary shares for the year |  | 612,710,079 | 612,671,108 | 612,659,638
Weighted average of outstanding ordinary shares for the year adjusted to reflect the effect of dilution |  | 612,710,079 | 612,671,108 | 612,659,638
Basic earnings per share | [1] | $ 16.4042 | $ 35.6145 | $ (5.0924)
Diluted earnings per share | [1] | $ 16.4042 | $ 35.6145 | $ (5.0924)
[1] | Since Banco BBVA Argentina S.A. has not issued financial instruments with a dilutive effect on earnings per share, basic and diluted earnings per share are the same.

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