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Debt Securities at Fair Value Through Profit or Loss - Summary of Debt Securities at Fair Value Through Profit or Loss (Detail) - ARS ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | $ 54,982,465 | $ 7,725,991
Government securities [member] |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 54,604,015 | 6,548,118
Government securities [member] | Other [member] |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 177,554 | 1,203,612
Government securities [member] | Level 1 [member] | Federal government treasury bonds at discount in pesos - Maturity: 01-29-2021 |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 17,049,960 |
Government securities [member] | Level 1 [member] | Federal government treasury bonds at discount in pesos - Maturity: 02-26-2021 |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 11,273,975 |
Government securities [member] | Level 1 [member] | Federal government treasury bonds in pesos adjusted by CER - Maturity: 07-22-2021 |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 10,000,259 | 5,341,210
Government securities [member] | Level 1 [member] | Federal government treasury bonds in pesos adjusted by CER - Maturity: 08-05-2021 |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 7,747,857 |
Government securities [member] | Level 1 [member] | Federal government treasury bonds in pesos BADLAR +100 PB - Maturity: 08-05-2021 |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 5,971,755 |
Government securities [member] | Level 1 [member] | Federal government treasury bonds in pesos adjusted by CER - Maturity: 03-25-2023 |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 974,607 |
Government securities [member] | Level 1 [member] | Federal government treasury bonds in pesos BADLAR +200 PBS - Maturity: 04-03-2022 |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 533,627 | 3,296
Government securities [member] | Level 1 [member] | Federal government treasury bonds in pesos - Private Badlar - Maturity: 11-09-2026 |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 314,671 |
Government securities [member] | Level 1 [member] | Federal government treasury bonds in pesos adjusted by CER - Maturity: 03-18-2022 |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 307,664 |
Government securities [member] | Level 1 [member] | Federal government treasury bonds in pesos adjusted by CER - Maturity: 03-25-2024 |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 252,086 |
Private securities [member] |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 378,450 | 1,177,873
Private securities [member] | Debt Securities in Financial Trusts Consubond [member] |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss |  | 482,369
Private securities [member] | Debt Securities in Financial Trusts Agrocap [member] |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss |  | 129,091
Private securities [member] | Debt Securities in Financial Trusts Secubono Series 191 Class A – Maturity: 06-29-2020 [member] |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss |  | 114,820
Private securities [member] | Corporate Bonds Province of Buenos Aires Bank Class 009 -Maturity: 04-18-2021 [member] |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss |  | 68,246
Private securities [member] | Debt Securities in Financial Trusts Chubut Regalías Hidrocarburíferas – Maturity: 07-01-2020 [member] |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss |  | 41,105
Private securities [member] | Debt Securities in Financial Trusts Secubono Series 189A – Maturity: 03-30-2020 [member] |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss |  | 30,220
Private securities [member] | Other [member] |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss |  | 73,338
Private securities [member] | Level 2 [member] | Corporate bonds Aluar Aluminio Argentino SA Class 003 - Maturity: 07-30-2023 |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 6 |
Private securities [member] | Level 3 [member] | Debt Securities in Financial Trusts Surcos [member] |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 249,107 | 143,368
Private securities [member] | Level 3 [member] | Debt Securities in Financial Trusts Secubono [member] |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | 126,983 | 92,945
Private securities [member] | Level 3 [member] | Securities of companies of publics service [Member] |  |
Disclosure of debt securities at fair value through profit or loss [line items] |  |
Debt securities at fair value through profit or loss | $ 2,354 | $ 2,371

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