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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, 2021
Dec. 31, 2020
Disclosure of internal credit grades [line items]    
Gross carrying amount, beginning balance $ 112,138,243 $ 202,560,830
Gross carrying amount, ending balance 86,234,118 112,138,243
Expected credit loss allowance, beginning balance 3,113,612 3,315,225
Expected credit loss allowance related to sundry debtors, ending balance 3,795,667 3,113,612
Assets originated or purchased [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount 106,402,692 97,886,030
Expected credit loss allowance 5,154,122 2,845,181
Assets derecognized or repaid [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount (87,455,367) (158,318,142)
Expected credit loss allowance (2,082,636) (1,773,612)
Amount Written Off [Member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount (922,381) (566,521)
Expected credit loss allowance (455,855) (497,816)
Monetary effects [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount (43,929,069) (29,423,954)
Expected credit loss allowance (1,933,576) (775,366)
Impairments stage 1 [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount, beginning balance 103,143,331 193,236,603
Gross carrying amount, ending balance 80,734,484 103,143,331
Expected credit loss allowance, beginning balance 924,727 658,755
Expected credit loss allowance related to sundry debtors, ending balance 665,919 924,727
Impairments stage 1 [member] | Assets originated or purchased [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount 102,232,782 94,241,056
Expected credit loss allowance 1,838,217 2,208,850
Impairments stage 1 [member] | Assets derecognized or repaid [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount (82,480,461) (155,364,844)
Expected credit loss allowance (861,783) (505,789)
Impairments stage 1 [member] | Transfers to Stage one [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount 539 321,712
Expected credit loss allowance 12 14,715
Impairments stage 1 [member] | Transfers to Stage two [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount   (571,954)
Expected credit loss allowance   (1,783)
Impairments stage 1 [member] | Transfers to stage three [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount (1,034,242) (2,327,375)
Expected credit loss allowance (896,024) (1,402,566)
Impairments stage 1 [member] | Monetary effects [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount (41,127,465) (26,391,867)
Expected credit loss allowance (339,230) (47,455)
Impairments stage 2 [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount, beginning balance 6,636,186 6,467,714
Gross carrying amount, ending balance 4,736,047 6,636,186
Expected credit loss allowance, beginning balance 1,007,573 688,336
Expected credit loss allowance related to sundry debtors, ending balance 2,511,535 1,007,573
Impairments stage 2 [member] | Assets originated or purchased [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount 4,169,910 3,644,974
Expected credit loss allowance 3,315,905 636,331
Impairments stage 2 [member] | Assets derecognized or repaid [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount (3,621,736) (1,399,089)
Expected credit loss allowance (524,662) (39,701)
Impairments stage 2 [member] | Transfers to Stage one [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount (539) (321,712)
Expected credit loss allowance (12) (14,715)
Impairments stage 2 [member] | Transfers to Stage two [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount 131,193 571,954
Expected credit loss allowance 29,267 1,783
Impairments stage 2 [member] | Transfers to stage three [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount (166,346) (237,394)
Expected credit loss allowance (37,119) (9,050)
Impairments stage 2 [member] | Monetary effects [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount (2,412,621) (2,090,261)
Expected credit loss allowance (1,279,417) (255,411)
Impairments Stage 3 [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount, beginning balance 2,358,726 2,856,513
Gross carrying amount, ending balance 763,587 2,358,726
Expected credit loss allowance, beginning balance 1,181,312 1,968,134
Expected credit loss allowance related to sundry debtors, ending balance 618,213 1,181,312
Impairments Stage 3 [member] | Assets derecognized or repaid [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount (1,353,170) (1,554,209)
Expected credit loss allowance (696,191) (1,228,122)
Impairments Stage 3 [member] | Transfers to Stage two [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount (131,193)  
Expected credit loss allowance (29,267)  
Impairments Stage 3 [member] | Transfers to stage three [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount 1,200,588 2,564,769
Expected credit loss allowance 933,143 1,411,616
Impairments Stage 3 [member] | Amount Written Off [Member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount (922,381) (566,521)
Expected credit loss allowance (455,855) (497,816)
Impairments Stage 3 [member] | Monetary effects [member]    
Disclosure of internal credit grades [line items]    
Gross carrying amount (388,983) (941,826)
Expected credit loss allowance $ (314,929) $ (472,500)