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Related Parties - Transactions And Balances With Key Management Personnel (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deposits Member      
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items]      
Balances With Key Management Personnel $ 18,461 $ 46,633  
Transactions with key management personnel 1,196 248 $ 154
Credit Cards Member | Loans Member      
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items]      
Balances With Key Management Personnel 4,618 4,472  
Transactions with key management personnel 1,090 1,514 1,043
Overdrafts Member | Loans Member      
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items]      
Balances With Key Management Personnel 41 29  
Transactions with key management personnel 0 15 23
Consumer Loans Member | Loans Member      
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items]      
Balances With Key Management Personnel 0 0  
Transactions with key management personnel 0 0 15
Mortgage With Key Management Personnel Member | Loans Member      
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items]      
Balances With Key Management Personnel 1,258 2,024  
Transactions with key management personnel 278 445 423
Financial Leases Member | Loans Member      
Disclosure Of Transactions And Balances With Key Management Personnel [Line Items]      
Balances With Key Management Personnel 0 0  
Transactions with key management personnel $ 0 $ 0 $ 2