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Financial Instruments Risks - Credit Quality of Assets (Details) - ARS ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure Of Credit Quality Of Assets [Line Items] |  |
Financial Assets At Amortised Cost | $ 206,027,269 | $ 318,689,020
Loans And Advances To Customers | 190,041,967 | 264,512,229
Loans And Advances To Banks | 5,069,933 | 14,823,052
Other Financial Assets | 10,897,537 | 19,786,689
Loans And Advances To Central Banks | 17,405 | 589
Loans And Advances To Government Sector | 427 | 317
Reverse Repurchase Agreements | 0 | 19,566,144
FINANCIAL ASSETS AT FAIR VALUE THROUGH OTHER COMPREHENSIVE INCOME | 45,205,882 | 37,787,332
Debt Securities FVOCI | 45,178,513 | 37,765,909
Equity Instruments FVOCI | 27,369 | 21,423
Total Loan Commitments And Financial Guarantees | 49,707,760 |
Amortised Cost [Member] |  |
Disclosure Of Credit Quality Of Assets [Line Items] |  |
Financial Assets At Amortised Cost | 208,136,419 | 325,210,804
Loans And Advances To Customers | 201,454,375 | 270,764,079
Loans And Advances To Banks | 5,198,021 | 14,874,564
Other Financial Assets | 1,466,191 | 19,786,692
Loans And Advances To Central Banks | 17,405 | 589
Loans And Advances To Government Sector | 427 | 317
Reverse Repurchase Agreements |  | 19,784,563
FINANCIAL ASSETS AT FAIR VALUE THROUGH OTHER COMPREHENSIVE INCOME | 45,212,713 | 37,787,332
Debt Securities FVOCI | 45,212,713 | 37,765,909
Equity Instruments FVOCI |  | 21,423
Total Financial Assets Risk | 253,349,132 | 362,998,136
Total Loan Commitments And Financial Guarantees | 49,707,760 | 220,441,622
Total Exposure To Credit Risk | 303,056,892 | 583,439,758
Total [member] |  |
Disclosure Of Credit Quality Of Assets [Line Items] |  |
Financial Assets At Amortised Cost | 196,590,375 | 318,689,020
Loans And Advances To Customers | 190,041,967 | 264,512,229
Loans And Advances To Banks | 5,069,933 | 14,823,052
Other Financial Assets | 1,460,643 | 19,786,689
Loans And Advances To Central Banks | 17,405 | 589
Loans And Advances To Government Sector | 427 | 317
Reverse Repurchase Agreements |  | 19,566,144
FINANCIAL ASSETS AT FAIR VALUE THROUGH OTHER COMPREHENSIVE INCOME | 40,309,297 | 37,787,332
Debt Securities FVOCI | 40,309,297 | 37,765,909
Equity Instruments FVOCI |  | 21,423
Total Financial Assets Risk | 236,899,672 | 356,476,352
Total Loan Commitments And Financial Guarantees | 48,777,183 | 219,472,627
Total Exposure To Credit Risk | 285,676,855 | 575,948,979
Stage 1 [Member] |  |
Disclosure Of Credit Quality Of Assets [Line Items] |  |
Financial Assets At Amortised Cost | 176,257,793 | 297,513,220
Loans And Advances To Customers | 169,934,636 | 243,336,429
Loans And Advances To Banks | 5,069,933 | 14,823,052
Other Financial Assets | 1,235,392 | 19,786,689
Loans And Advances To Central Banks | 17,405 | 589
Loans And Advances To Government Sector | 427 | 317
Reverse Repurchase Agreements |  | 19,566,144
FINANCIAL ASSETS AT FAIR VALUE THROUGH OTHER COMPREHENSIVE INCOME | 29,088,445 | 37,787,332
Debt Securities FVOCI | 29,088,445 | 37,765,909
Equity Instruments FVOCI |  | 21,423
Total Financial Assets Risk | 205,346,238 | 335,300,552
Total Loan Commitments And Financial Guarantees | 44,252,081 | 208,963,783
Stage 2 [Member] |  |
Disclosure Of Credit Quality Of Assets [Line Items] |  |
Financial Assets At Amortised Cost | 18,114,616 | 18,400,430
Loans And Advances To Customers | 17,889,383 | 18,400,430
Other Financial Assets | 225,233 | 0
FINANCIAL ASSETS AT FAIR VALUE THROUGH OTHER COMPREHENSIVE INCOME | 11,220,852 | 0
Debt Securities FVOCI | 11,220,852 | 0
Total Financial Assets Risk | 29,335,468 | 18,400,430
Total Loan Commitments And Financial Guarantees | 4,516,549 | 10,397,237
Stage 3 [Member] |  |
Disclosure Of Credit Quality Of Assets [Line Items] |  |
Financial Assets At Amortised Cost | 2,217,966 | 2,775,370
Loans And Advances To Customers | 2,217,948 | 2,775,370
Other Financial Assets | 18 |
Total Financial Assets Risk | 2,217,966 | 2,775,370
Total Loan Commitments And Financial Guarantees | $ 8,553 | $ 111,607

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