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Capital Stock - Summary of Bank's Subscribed and Paid-in Capital (Parenthetical) (Detail)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Oct. 29, 2019
ARS ($)
Apr. 30, 2019
ARS ($)
$ / shares
shares
Apr. 30, 2019
Vote
$ / shares
shares
Dec. 31, 2020
Vote
Dec. 31, 2018
ARS ($)
Vote
$ / shares
shares
Jan. 19, 2019
ARS ($)
Oct. 17, 2018
$ / shares
Aug. 08, 2018
$ / shares
Disclosure of classes of share capital [line items]                
Notional amount of shares settled         $ 205,979 $ 418,528    
Major business combination [member] | Banco del Tucuman SA [member]                
Disclosure of classes of share capital [line items]                
Increase in capital $ 15,662              
Class B Ordinary Shares [member]                
Disclosure of classes of share capital [line items]                
Par value per share | $ / shares   $ 1 $ 1   $ 1   $ 1 $ 1
Number of vote | Vote     1 1 1      
Share acquired amount   $ 30,265     $ 298,196      
Number of shares acquired | shares   30,265,275 30,265,275   2,028,251      
Settled common shares | shares         711,386      
Settled common shares amount         $ 98,353      
Pending settlement common shares | shares         1,316,865      
Pending settlement common shares amount         $ 199,843