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Related Parties - Transactions And Balances With Key Management Personnel (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deposits Member      
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items]      
Balances With Key Management Personnel $ 32,673 $ 25,133  
Transactions with key management personnel 1,075 1,628 $ 338
Credit Cards Member | Loans Member      
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items]      
Balances With Key Management Personnel 4,975 6,287  
Transactions with key management personnel 1,131 1,484 2,061
Overdrafts Member | Loans Member      
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items]      
Balances With Key Management Personnel 30 5  
Transactions with key management personnel     20
Mortgage With Key Management Personnel Member | Loans Member      
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items]      
Balances With Key Management Personnel 1,190 1,713  
Transactions with key management personnel $ 255 $ 378 $ 606