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Loss Allowance for Expected Credit Losses On Credit Exposures Not Measured at Fair Value Through Profit or Loss - Additional Information (Detail) - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Allowance For Impairment [line items] |  |  |
Contractual amount outstanding on loans and other facilities written off by bank | $ 4,349,903 | $ 4,127,716 |
Expected credit losses | 267,349,317 | 307,633,542 |
Losses for expected credit losses | 7,861,600 | 5,917,873 | $ 6,073,426
Other debt securities measured at fair value through other comprehensive income | 178,005,144 | 63,824,735 |
Government securities [member] |  |  |
Disclosure Of Allowance For Impairment [line items] |  |  |
Expected credit losses | 5,964 | 286 |
Transfers Between Stages Of Fair Value Hierarchy Assets | 0 | 0 |
Government securities [member] | Gross carrying amount [member] |  |  |
Disclosure Of Allowance For Impairment [line items] |  |  |
Other debt securities measured at fair value through other comprehensive income | 178,005,144 | 63,824,735 |
Other Financial Assets [member] |  |  |
Disclosure Of Allowance For Impairment [line items] |  |  |
Expected credit losses | 18,929 | 14,032 |
Transfers Between Stages Of Fair Value Hierarchy Assets | 0 | 0 |
Other Financial Assets [member] | Gross carrying amount [member] |  |  |
Disclosure Of Allowance For Impairment [line items] |  |  |
Other debt securities measured at fair value through other comprehensive income | 18,905,219 | 8,405,598 |
Bank Loan [member] |  |  |
Disclosure Of Allowance For Impairment [line items] |  |  |
Loan Portfolio Sales Profits | 36,947 | 69,935 |
Loan Portfolio Sales Losses | 27 | 1,446 |
Corporate Bonds [Member] |  |  |
Disclosure Of Allowance For Impairment [line items] |  |  |
Expected credit losses | 1,234 | 2,088 |
Financial Trust [member] |  |  |
Disclosure Of Allowance For Impairment [line items] |  |  |
Expected credit losses | 109 | 549 |
Local Government Securities [member] |  |  |
Disclosure Of Allowance For Impairment [line items] |  |  |
Expected credit losses | $ 4,129 | $ 61,064 |

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