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Contingent Transactions - Summary of Contingent Transactions (Detail) - ARS ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of contingent liabilities [line items] |  |
Less: Allowance for ECL | $ (23,200) | $ (23,514)
Contingent transactions, total | 97,887,138 | 128,721,625
Undrawn commitments of credit cards and checking accounts [Member] |  |
Disclosure of contingent liabilities [line items] |  |
Contingent transactions, total | 95,220,298 | 124,364,340
Guarantees granted [member] |  |
Disclosure of contingent liabilities [line items] |  |
Contingent transactions, total | 1,282,770 | 2,340,277
Letters of credit [member] |  |
Disclosure of contingent liabilities [line items] |  |
Contingent transactions, total | 888,664 | 607,827
Overdraft and unused agreed commitments [member] |  |
Disclosure of contingent liabilities [line items] |  |
Contingent transactions, total | 518,606 | 1,432,695
Gross carrying amount [member] |  |
Disclosure of contingent liabilities [line items] |  |
Contingent transactions, total | $ 97,910,338 | $ 128,745,139

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