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Capital Management, Corporate Governance Transparency Policy and Risk Management - Summary of Collateral and Other Credit Improvements (Detail) - ARS ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Collateral And Other Credit Enhancements [line items] |  |
Maximum exposure to credit risk | $ 267,349,317 | $ 307,633,542
Total collateral | 84,474,882 | 75,613,250
Guarantees received [member] |  |
Disclosure Of Collateral And Other Credit Enhancements [line items] |  |
Maximum exposure to credit risk | 593,289,279 | 532,676,925
Fair value of collateral Pledges on time deposits | 798,765 | 515,890
Fair value of collateral Deferred payment checks | 6,546,693 | 3,665,050
Fair value of collateral Mortgage on real property | 23,996,519 | 29,919,411
Fair value of collateral Pledges on vehicles and machinery | 4,124,485 | 5,490,143
Fair value of collateral Pledges on personal property | 1,667,100 | 1,465,710
Fair value of collateral Other | 47,341,320 | 34,557,046
Total collateral | 84,474,882 | 75,613,250
Net exposure | 508,814,397 | 457,063,675
Associated ECL | 9,981,687 | 7,003,486
Guarantees received [member] | Loans and other financing [member] |  |
Disclosure Of Collateral And Other Credit Enhancements [line items] |  |
Maximum exposure to credit risk | 267,349,317 | 307,633,542
Fair value of collateral Pledges on time deposits | 797,460 | 513,103
Fair value of collateral Deferred payment checks | 6,546,693 | 3,665,050
Fair value of collateral Mortgage on real property | 23,996,519 | 29,919,411
Fair value of collateral Pledges on vehicles and machinery | 4,124,485 | 5,490,143
Fair value of collateral Pledges on personal property | 1,667,100 | 1,465,710
Fair value of collateral Other | 47,062,080 | 33,654,626
Total collateral | 84,194,337 | 74,708,043
Net exposure | 183,154,980 | 232,925,499
Associated ECL | 9,928,122 | 6,901,953
Guarantees received [member] | Other debt securities at fair value through OCI [member] |  |
Disclosure Of Collateral And Other Credit Enhancements [line items] |  |
Maximum exposure to credit risk | 178,005,144 | 63,824,735
Net exposure | 178,005,144 | 63,824,735
Associated ECL | 5,964 | 286
Guarantees received [member] | Loans commitment [Member] |  |
Disclosure Of Collateral And Other Credit Enhancements [line items] |  |
Maximum exposure to credit risk | 97,910,338 | 128,745,139
Fair value of collateral Pledges on time deposits | 1,305 | 2,787
Fair value of collateral Other | 279,240 | 902,420
Total collateral | 280,545 | 905,207
Net exposure | 97,629,793 | 127,839,932
Associated ECL | 23,200 | 23,514
Guarantees received [member] | Other financial assets [Member] |  |
Disclosure Of Collateral And Other Credit Enhancements [line items] |  |
Maximum exposure to credit risk | 18,905,219 | 8,405,598
Net exposure | 18,905,219 | 8,405,598
Associated ECL | 18,929 | 14,032
Guarantees received [member] | Other debt securities at amortized cost [member] |  |
Disclosure Of Collateral And Other Credit Enhancements [line items] |  |
Maximum exposure to credit risk | 31,119,261 | 24,067,911
Net exposure | 31,119,261 | 24,067,911
Associated ECL | 5,472 | 63,701
Collateral held for stage3 assets [member] |  |
Disclosure Of Collateral And Other Credit Enhancements [line items] |  |
Maximum exposure to credit risk | 3,029,870 | 5,272,831
Fair value of collateral Deferred payment checks | 1,064 | 3,086
Fair value of collateral Mortgage on real property | 709,038 | 735,440
Fair value of collateral Pledges on vehicles and machinery | 935,558 | 167,028
Fair value of collateral Pledges on personal property | 65,485 | 11,805
Fair value of collateral Other | 270,083 | 955,458
Total collateral | 1,981,228 | 1,872,817
Net exposure | 1,048,642 | 3,400,014
Associated ECL | 1,658,115 | 2,967,457
Collateral held for stage3 assets [member] | Loans and other financing [member] |  |
Disclosure Of Collateral And Other Credit Enhancements [line items] |  |
Maximum exposure to credit risk | 3,029,870 | 5,272,831
Fair value of collateral Deferred payment checks | 1,064 | 3,086
Fair value of collateral Mortgage on real property | 709,038 | 735,440
Fair value of collateral Pledges on vehicles and machinery | 935,558 | 167,028
Fair value of collateral Pledges on personal property | 65,485 | 11,805
Fair value of collateral Other | 270,083 | 955,458
Total collateral | 1,981,228 | 1,872,817
Net exposure | 1,048,642 | 3,400,014
Associated ECL | $ 1,658,115 | $ 2,967,457

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