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Fair Value Quantitative and Qualitative Disclosures - Summary of Financial Assets and Liabilities Recognized at Fair Value using the Valuation Technique (Detail) - Level 3 [member] - Banks own assumptions [member] - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Fair Value Measurement Of Financial Assets And Liabilities Disaggregated By Valuation Technique [line items] |  |
Amount at the beginning | $ 3,549,583 | $ 95,095
Profit and loss | 2,609,737 | 328,662
Recognition and derecognition | 17,111 | 4,372,702
Monetary effects | (967,987) | (1,246,876)
Amount at end of the fiscal year | 5,208,444 | 3,549,583
Debt securities [member] |  |
Disclosure Of Fair Value Measurement Of Financial Assets And Liabilities Disaggregated By Valuation Technique [line items] |  |
Amount at the beginning | 1,109,626 | 2,703,786
Profit and loss | 207,791 | 885,411
Amount at end of the fiscal year | 378,444 | 1,109,626
Recognition and derecognition | (791,555) | (1,706,169)
Monetary effects | (147,418) | (773,402)
Other Financial Assets1 [member] |  |
Disclosure Of Fair Value Measurement Of Financial Assets And Liabilities Disaggregated By Valuation Technique [line items] |  |
Amount at the beginning | 31,314 | 190,929
Profit and loss | 9,472 | 18,737
Amount at end of the fiscal year | 26,179 | 31,314
Recognition and derecognition | (6,506) | (143,266)
Monetary effects | (8,101) | (35,086)
Derivatives [member] |  |
Disclosure Of Fair Value Measurement Of Financial Assets And Liabilities Disaggregated By Valuation Technique [line items] |  |
Amount at the beginning | 769,490 |
Profit and loss | 417,029 |
Recognition and derecognition |  | 769,490
Monetary effects | (204,273) |
Amount at end of the fiscal year | $ 982,246 | $ 769,490

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- Definition Disclosure Of Fair Value Measurement Of Financial Assets And Liabilities Disaggregated By Valuation Technique [line items] + References No definition available. + Details
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- Definition Equity instruments at fair value through profit and loss on monetary effects. + References No definition available. + Details
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- Definition Gain loss on recognised and derecongnised in Profit or loss Fair value measurement entity own equity instruments. + References No definition available. + Details
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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The gains (losses) including exchange differences recognised in profit or loss on the fair value measurement of assets. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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