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Related Parties - Transactions And Balances With Parent Company Except Key Management Personnel (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash And Other Demand Deposits Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company $ 1,168,271 $ 621,390  
Results With Parent Company 0    
Derivative Financial Assets Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 0 886,425  
Results With Parent Company 0    
Other Financial Assets Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 0 735,992  
Results With Parent Company 0    
Trading Liabilities Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 2,131    
Results With Parent Company 0    
Other Liabilities Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 7,061,795 480,355  
Results With Parent Company 721,876 398,135 $ 234,262
Derivative Financial Liabilities Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 11,618 1,634,234  
Results With Parent Company 385,850 9,569 209,999
Securities In Custody Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 63,028,083 77,454,929  
Results With Parent Company 0    
Derivative Instruments Notional Amount Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 925,000 15,269,110  
Results With Parent Company 0    
Securities Granted Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 2,656,720 962,230  
Results With Parent Company 5,956 3,254 $ 4,570
Guarantees Received Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 3,725,274 $ 38,612  
Results With Parent Company $ 0