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Loss Allowance for Expected Credit Losses On Credit Exposures Not Measured at Fair Value Through Profit or Loss - Summary of Credit Quality and the Maximum Exposure to Credit Risk based on the Bank's Internal Credit Rating System and Year-end Stage Classification (Detail) - Consumer [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 | $ 173,435,436 | $ 238,176,987
Gross carrying amount, ending balance | 193,056,864 | 173,435,436
Expected credit loss allowance, beginning balance | 4,705,591 | 6,526,001
Expected credit loss allowance related to sundry debtors, ending balance | 7,865,330 | 4,705,591
Assets originated or purchased [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 129,623,528 | 113,634,745
Expected credit loss allowance | 6,166,843 | 3,354,324
Assets derecognized or repaid [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (56,462,468) | (92,671,553)
Expected credit loss allowance | (540,367) | (1,991,548)
Amounts Written Off [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (1,698,360) | (3,458,613)
Expected credit loss allowance | (760,077) | (1,260,472)
Monetary effects [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (51,841,272) | (82,246,130)
Expected credit loss allowance | (1,706,660) | (1,922,714)
Stage 1 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount, beginning balance | 152,543,931 | 190,999,547
Gross carrying amount, ending balance | 180,456,655 | 152,543,931
Expected credit loss allowance, beginning balance | 1,561,990 | 1,621,844
Expected credit loss allowance related to sundry debtors, ending balance | 4,631,018 | 1,561,990
Stage 1 [member] | Assets originated or purchased [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 122,636,191 | 103,467,653
Expected credit loss allowance | 4,381,186 | 2,472,513
Stage 1 [member] | Assets derecognized or repaid [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (48,194,960) | (71,378,819)
Expected credit loss allowance | 362,221 | 19,972
Stage 1 [member] | Transfers to Stage 1 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 8,634,947 | 14,992,526
Expected credit loss allowance | 766,661 | 733,257
Stage 1 [member] | Transfers to Stage 2 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (4,575,337) | (8,171,761)
Expected credit loss allowance | (75,871) | (115,770)
Stage 1 [member] | Transfers to Stage 3 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (1,104,828) | (4,033,895)
Expected credit loss allowance | (708,400) | (1,912,100)
Stage 1 [member] | Amounts Written Off [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (35,643) | (323,899)
Expected credit loss allowance | (1,676) | (9,225)
Stage 1 [member] | Monetary effects [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (49,447,646) | (73,007,421)
Expected credit loss allowance | (1,655,093) | (1,248,501)
Stage 2 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount, beginning balance | 17,511,125 | 42,324,135
Gross carrying amount, ending balance | 11,133,013 | 17,511,125
Expected credit loss allowance, beginning balance | 1,480,048 | 2,602,099
Expected credit loss allowance related to sundry debtors, ending balance | 2,358,826 | 1,480,048
Stage 2 [member] | Assets originated or purchased [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 6,987,337 | 10,167,092
Expected credit loss allowance | 1,785,657 | 881,811
Stage 2 [member] | Assets derecognized or repaid [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (7,286,602) | (19,642,849)
Expected credit loss allowance | (364,035) | (1,093,709)
Stage 2 [member] | Transfers to Stage 1 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (8,338,341) | (14,771,361)
Expected credit loss allowance | (621,987) | (636,265)
Stage 2 [member] | Transfers to Stage 2 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 4,830,837 | 8,759,526
Expected credit loss allowance | 188,316 | 330,095
Stage 2 [member] | Transfers to Stage 3 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (309,271) | (951,529)
Expected credit loss allowance | (48,396) | (100,707)
Stage 2 [member] | Amounts Written Off [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (284,523) | (936,075)
Expected credit loss allowance | (56,306) | (144,692)
Stage 2 [member] | Monetary effects [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (1,977,549) | (7,437,814)
Expected credit loss allowance | (4,471) | (358,584)
Stage 3 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount, beginning balance | 3,380,380 | 4,853,305
Gross carrying amount, ending balance | 1,467,196 | 3,380,380
Expected credit loss allowance, beginning balance | 1,663,553 | 2,302,058
Expected credit loss allowance related to sundry debtors, ending balance | 875,486 | 1,663,553
Stage 3 [member] | Assets derecognized or repaid [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (980,906) | (1,649,885)
Expected credit loss allowance | (538,553) | (917,811)
Stage 3 [member] | Transfers to Stage 1 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (296,606) | (221,165)
Expected credit loss allowance | (144,674) | (96,992)
Stage 3 [member] | Transfers to Stage 2 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (255,500) | (587,765)
Expected credit loss allowance | (112,445) | (214,325)
Stage 3 [member] | Transfers to Stage 3 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 1,414,099 | 4,985,424
Expected credit loss allowance | 756,796 | 2,012,807
Stage 3 [member] | Amounts Written Off [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (1,378,194) | (2,198,639)
Expected credit loss allowance | (702,095) | (1,106,555)
Stage 3 [member] | Monetary effects [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (416,077) | (1,800,895)
Expected credit loss allowance | $ (47,096) | $ (315,629)

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