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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash And Other Demand Deposits Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company $ 456,433 $ 399,200  
Results With Parent Company 0 0 $ 0
Derivative Financial Assets Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 651,110 35,654  
Results With Parent Company 0 0 0
Other Financial Assets Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 540,612 476,933  
Results With Parent Company 0 0 0
Trading Liabilities Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 0 485,181  
Results With Parent Company 0 0 0
Other Liabilities Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 352,838 78,910  
Results With Parent Company 292,445 172,074 97,728
Derivative Financial Liabilities Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 1,200,403 78,759  
Results With Parent Company 7,027 154,252 0
Securities In Custody Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 56,893,378 87,676,176  
Results With Parent Company 0 0 0
Derivative Instruments Notional Amount Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 11,215,700 7,956,847  
Results With Parent Company 0 0 0
Securities Granted Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 706,792 913  
Results With Parent Company 2,426 3,357 1,966
Guarantees Received Member      
Transactions and Balances with Parent Company Except Key Management Personnel [Line Items]      
Balances With Parent Company 28,362 1,103,964  
Results With Parent Company $ 0 $ 0 $ 0