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Loss Allowance for Expected Credit Losses On Credit Exposures Not Measured at Fair Value Through Profit or Loss - Summary of Exposures Gross of Impairment Allowances (Detail) - ARS ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Impairment Loss Allowances Against Loans Of Other Debt [Line Items] |  |
Maximum exposure to credit risk | $ 31,119,261 | $ 24,067,911
Percentage of maximum expose to credit risk | 100.00% | 100.00%
Local Government Securities [member] |  |
Disclosure Of Impairment Loss Allowances Against Loans Of Other Debt [Line Items] |  |
Maximum exposure to credit risk | $ 30,587,228 | $ 20,371,040
Percentage of maximum expose to credit risk | 98.29% | 84.64%
Corporate Bonds [Member] |  |
Disclosure Of Impairment Loss Allowances Against Loans Of Other Debt [Line Items] |  |
Maximum exposure to credit risk | $ 365,341 | $ 2,198,423
Percentage of maximum expose to credit risk | 1.17% | 9.13%
Financial Trust [member] |  |
Disclosure Of Impairment Loss Allowances Against Loans Of Other Debt [Line Items] |  |
Maximum exposure to credit risk | $ 166,692 | $ 1,498,448
Percentage of maximum expose to credit risk | 0.54% | 6.23%
Impairments stage 1 [member] |  |
Disclosure Of Impairment Loss Allowances Against Loans Of Other Debt [Line Items] |  |
Maximum exposure to credit risk | $ 31,119,261 | $ 15,071,244
Percentage of maximum expose to credit risk | 100.00% | 62.62%
Impairments stage 1 [member] | Local Government Securities [member] |  |
Disclosure Of Impairment Loss Allowances Against Loans Of Other Debt [Line Items] |  |
Maximum exposure to credit risk | $ 30,587,228 | $ 11,374,373
Impairments stage 1 [member] | Corporate Bonds [Member] |  |
Disclosure Of Impairment Loss Allowances Against Loans Of Other Debt [Line Items] |  |
Maximum exposure to credit risk | 365,341 | 2,198,423
Impairments stage 1 [member] | Financial Trust [member] |  |
Disclosure Of Impairment Loss Allowances Against Loans Of Other Debt [Line Items] |  |
Maximum exposure to credit risk | $ 166,692 | 1,498,448
Impairments stage 2 [member] |  |
Disclosure Of Impairment Loss Allowances Against Loans Of Other Debt [Line Items] |  |
Maximum exposure to credit risk |  | $ 8,996,667
Percentage of maximum expose to credit risk |  | 37.38%
Impairments stage 2 [member] | Local Government Securities [member] |  |
Disclosure Of Impairment Loss Allowances Against Loans Of Other Debt [Line Items] |  |
Maximum exposure to credit risk |  | $ 8,996,667

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