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Loss Allowance for Expected Credit Losses On Credit Exposures Not Measured at Fair Value Through Profit or Loss - Summary of Changes in Gross Carrying Amount and ECL Allowances (Detail) - Commercial [member] - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of internal credit grades [line items] |  |
Gross carrying amount, beginning balance | $ 134,198,106 | $ 145,150,757
Gross carrying amount, ending balance | 74,292,453 | 134,198,106
Expected credit loss allowance, beginning balance | 2,196,362 | 1,576,856
Expected credit loss allowance related to sundry debtors, ending balance | 2,062,792 | 2,196,362
Assets originated or purchased [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 64,850,252 | 154,707,673
Expected credit loss allowance | 1,884,954 | 2,676,131
Assets derecognized or repaid [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (104,886,994) | (113,721,044)
Expected credit loss allowance | (1,175,031) | (1,127,543)
Amount Written Off [Member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (375,325) | (123,661)
Expected credit loss allowance | (329,807) | (53,722)
Monetary effects [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (19,493,586) | (51,815,619)
Expected credit loss allowance | (513,686) | (875,360)
Impairments stage 1 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount, beginning balance | 128,020,746 | 140,670,991
Gross carrying amount, ending balance | 68,333,255 | 128,020,746
Expected credit loss allowance, beginning balance | 436,430 | 559,907
Expected credit loss allowance related to sundry debtors, ending balance | 612,639 | 436,430
Impairments stage 1 [member] | Assets originated or purchased [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 62,435,429 | 150,197,527
Expected credit loss allowance | 1,463,380 | 2,089,381
Impairments stage 1 [member] | Assets derecognized or repaid [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (102,930,411) | (110,364,709)
Expected credit loss allowance | (335,089) | (411,175)
Impairments stage 1 [member] | Transfers to Stage one [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 213,137 | 536,346
Expected credit loss allowance | 9,749 | 76,434
Impairments stage 1 [member] | Transfers to Stage two [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (378,924) | (1,249,433)
Expected credit loss allowance | (1,181) | (17,184)
Impairments stage 1 [member] | Transfers to stage three [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (1,541,904) | (2,569,451)
Expected credit loss allowance | (929,211) | (1,843,210)
Impairments stage 1 [member] | Monetary effects [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (17,484,818) | (49,200,525)
Expected credit loss allowance | (31,439) | (17,723)
Impairments stage 2 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount, beginning balance | 4,284,909 | 2,125,782
Gross carrying amount, ending balance | 4,396,524 | 4,284,909
Expected credit loss allowance, beginning balance | 456,028 | 120,738
Expected credit loss allowance related to sundry debtors, ending balance | 667,524 | 456,028
Impairments stage 2 [member] | Assets originated or purchased [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 2,414,823 | 4,510,146
Expected credit loss allowance | 421,574 | 586,750
Impairments stage 2 [member] | Assets derecognized or repaid [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (926,908) | (1,623,329)
Expected credit loss allowance | (26,302) | (87,985)
Impairments stage 2 [member] | Transfers to Stage one [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (213,137) | (428,565)
Expected credit loss allowance | (9,749) | (13,892)
Impairments stage 2 [member] | Transfers to Stage two [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 378,924 | 1,249,433
Expected credit loss allowance | 1,181 | 17,184
Impairments stage 2 [member] | Transfers to stage three [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (157,275) | (29,397)
Expected credit loss allowance | (5,996) | (1,035)
Impairments stage 2 [member] | Amount Written Off [Member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount |  | (236)
Expected credit loss allowance |  | (5)
Impairments stage 2 [member] | Monetary effects [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (1,384,812) | (1,518,925)
Expected credit loss allowance | (169,212) | (165,727)
Impairments Stage 3 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount, beginning balance | 1,892,451 | 2,353,984
Gross carrying amount, ending balance | 1,562,674 | 1,892,451
Expected credit loss allowance, beginning balance | 1,303,904 | 896,211
Expected credit loss allowance related to sundry debtors, ending balance | 782,629 | 1,303,904
Impairments Stage 3 [member] | Assets derecognized or repaid [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (1,029,675) | (1,733,006)
Expected credit loss allowance | (813,640) | (628,383)
Impairments Stage 3 [member] | Transfers to Stage one [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount |  | (107,781)
Expected credit loss allowance |  | (62,542)
Impairments Stage 3 [member] | Transfers to stage three [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 1,699,179 | 2,598,848
Expected credit loss allowance | 935,207 | 1,844,245
Impairments Stage 3 [member] | Amount Written Off [Member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (375,325) | (123,425)
Expected credit loss allowance | (329,807) | (53,717)
Impairments Stage 3 [member] | Monetary effects [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (623,956) | (1,096,169)
Expected credit loss allowance | $ (313,035) | $ (691,910)

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