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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)