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Capital Management, Corporate Governance Transparency Policy and Risk Management - Summary of Contractual Future Cash Flows of Financial Liabilities, Including Interest and Charges to be Accrued (Detail) - ARS ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure Of Liquidity Risk [line items] |  |
Deposits | $ 493,591,747 | $ 360,913,768
From the non financial government sector | 74,336,377 | 24,094,589
From the financial sector | 696,415 | 427,702
From the non financial private sector and foreign residents | 418,558,955 | 336,391,477
Derivative instruments | 230 | 1,046,556
Repo transactions | 620,389 | 1,364,962
Other financial institutions | 620,389 | 1,364,962
Other Financial Liabilities | 49,232,069 | 30,217,956
Financing received from the Central Bank of Argentina and other financial institutions | 949,506 | 3,165,822
Issued corporate bonds | 5,765,236 | 10,929,911
Subordinated corporate bonds | 48,422,080 | 49,125,434
Total | 598,581,257 | 456,764,409
Not later than one month [member] |  |
Disclosure Of Liquidity Risk [line items] |  |
Deposits | 439,899,936 | 319,128,393
From the non financial government sector | 67,873,301 | 22,974,090
From the financial sector | 696,415 | 427,702
From the non financial private sector and foreign residents | 371,330,220 | 295,726,601
Derivative instruments | 42 | 399,076
Repo transactions | 620,389 | 1,364,962
Other financial institutions | 620,389 | 1,364,962
Other Financial Liabilities | 47,876,408 | 28,687,673
Financing received from the Central Bank of Argentina and other financial institutions | 419,441 | 1,403,744
Issued corporate bonds | 209,346 | 436,031
Total | 489,025,562 | 351,419,879
Not later than three months [member] |  |
Disclosure Of Liquidity Risk [line items] |  |
Deposits | 45,047,684 | 35,554,356
From the non financial government sector | 5,558,974 | 1,059,457
From the non financial private sector and foreign residents | 39,488,710 | 34,494,899
Derivative instruments | 188 | 464,440
Other Financial Liabilities | 133,674 | 133,406
Financing received from the Central Bank of Argentina and other financial institutions | 199,471 | 1,130,058
Total | 45,381,017 | 37,282,260
Later than three months and not later than six months [member] |  |
Disclosure Of Liquidity Risk [line items] |  |
Deposits | 5,581,716 | 4,728,311
From the non financial government sector | 901,974 | 58,210
From the non financial private sector and foreign residents | 4,679,742 | 4,670,101
Derivative instruments |  | 183,040
Other Financial Liabilities | 125,844 | 141,649
Financing received from the Central Bank of Argentina and other financial institutions | 204,074 | 205,002
Issued corporate bonds | 2,762,098 | 701,097
Subordinated corporate bonds | 1,135,957 | 1,100,808
Total | 9,809,689 | 7,059,907
Later than six months and not later than one year [member] |  |
Disclosure Of Liquidity Risk [line items] |  |
Deposits | 3,025,417 | 1,398,959
From the non financial government sector | 2,128 | 2,832
From the non financial private sector and foreign residents | 3,023,289 | 1,396,127
Other Financial Liabilities | 317,199 | 227,982
Financing received from the Central Bank of Argentina and other financial institutions | 80,703 | 133,670
Issued corporate bonds | 208,048 | 1,006,731
Subordinated corporate bonds | 1,135,958 | 1,100,810
Total | 4,767,325 | 3,868,152
Over 12 months and up to 24 months [member] |  |
Disclosure Of Liquidity Risk [line items] |  |
Deposits | 34,807 | 72,883
From the non financial private sector and foreign residents | 34,807 | 72,883
Other Financial Liabilities | 264,590 | 442,189
Financing received from the Central Bank of Argentina and other financial institutions | 40,093 | 230,972
Issued corporate bonds | 2,585,744 | 4,579,987
Subordinated corporate bonds | 2,498,433 | 2,201,618
Total | 5,423,667 | 7,527,649
Later than two years [member] |  |
Disclosure Of Liquidity Risk [line items] |  |
Deposits | 2,187 | 30,866
From the non financial private sector and foreign residents | 2,187 | 30,866
Other Financial Liabilities | 514,354 | 585,057
Financing received from the Central Bank of Argentina and other financial institutions | 5,724 | 62,376
Issued corporate bonds |  | 4,206,065
Subordinated corporate bonds | 43,651,732 | 44,722,198
Total | $ 44,173,997 | $ 49,606,562

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