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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, 2021 | Dec. 31, 2020
Disclosure of internal credit grades [line items] |  |
Gross carrying amount, beginning balance | $ 291,403,176 | $ 261,786,280
Gross carrying amount, ending balance | 275,758,447 | 291,403,176
Expected credit loss allowance, beginning balance | 11,872,050 | 7,102,697
Expected credit loss allowance related to sundry debtors, ending balance | 5,835,810 | 11,872,050
Assets originated or purchased [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 263,050,631 | 195,655,871
Expected credit loss allowance | 6,776,037 | 9,308,334
Assets derecognized or repaid [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (137,106,726) | (85,225,372)
Expected credit loss allowance | (9,271,473) | (815,639)
Amounts Written Off [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (1,112,785) | (2,563,533)
Expected credit loss allowance | (567,958) | (1,147,273)
Monetary effects [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (140,475,849) | (78,250,070)
Expected credit loss allowance | (2,972,846) | (2,576,069)
Stage 1 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount, beginning balance | 272,384,223 | 230,252,301
Gross carrying amount, ending balance | 264,058,234 | 272,384,223
Expected credit loss allowance, beginning balance | 6,990,134 | 2,357,693
Expected credit loss allowance related to sundry debtors, ending balance | 2,806,382 | 6,990,134
Stage 1 [member] | Assets originated or purchased [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 256,847,227 | 185,109,070
Expected credit loss allowance | 5,719,840 | 6,613,034
Stage 1 [member] | Assets derecognized or repaid [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (128,290,490) | (72,746,260)
Expected credit loss allowance | (6,973,972) | 546,742
Stage 1 [member] | Transfers to Stage 1 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 6,597,845 | 13,033,730
Expected credit loss allowance | 1,274,440 | 1,157,211
Stage 1 [member] | Transfers to Stage 2 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (5,955,494) | (6,906,088)
Expected credit loss allowance | (281,697) | (114,521)
Stage 1 [member] | Transfers to Stage 3 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (2,858,159) | (1,667,645)
Expected credit loss allowance | (2,475,564) | (1,069,271)
Stage 1 [member] | Amounts Written Off [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (151,340) | (53,800)
Expected credit loss allowance | (17,182) | (2,530)
Stage 1 [member] | Monetary effects [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (134,515,578) | (74,637,085)
Expected credit loss allowance | (1,429,617) | (2,498,224)
Stage 2 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount, beginning balance | 16,804,351 | 26,431,578
Gross carrying amount, ending balance | 9,165,071 | 16,804,351
Expected credit loss allowance, beginning balance | 3,560,443 | 2,234,009
Expected credit loss allowance related to sundry debtors, ending balance | 1,003,706 | 3,560,443
Stage 2 [member] | Assets originated or purchased [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 6,203,404 | 10,546,801
Expected credit loss allowance | 1,056,197 | 2,695,300
Stage 2 [member] | Assets derecognized or repaid [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (7,808,736) | (10,998,516)
Expected credit loss allowance | (1,862,268) | (549,480)
Stage 2 [member] | Transfers to Stage 1 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (6,465,149) | (12,586,028)
Expected credit loss allowance | (1,192,519) | (938,837)
Stage 2 [member] | Transfers to Stage 2 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 6,033,073 | 7,291,744
Expected credit loss allowance | 323,331 | 284,247
Stage 2 [member] | Transfers to Stage 3 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (647,746) | (466,819)
Expected credit loss allowance | (253,151) | (73,050)
Stage 2 [member] | Amounts Written Off [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (285,289) | (429,464)
Expected credit loss allowance | (117,019) | (84,989)
Stage 2 [member] | Monetary effects [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (4,668,837) | (2,984,945)
Expected credit loss allowance | (511,308) | (6,757)
Stage 3 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount, beginning balance | 2,214,602 | 5,102,401
Gross carrying amount, ending balance | 2,535,142 | 2,214,602
Expected credit loss allowance, beginning balance | 1,321,473 | 2,510,995
Expected credit loss allowance related to sundry debtors, ending balance | 2,025,722 | 1,321,473
Stage 3 [member] | Assets derecognized or repaid [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (1,007,500) | (1,480,596)
Expected credit loss allowance | (435,233) | (812,901)
Stage 3 [member] | Transfers to Stage 1 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (132,696) | (447,702)
Expected credit loss allowance | (81,921) | (218,374)
Stage 3 [member] | Transfers to Stage 2 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (77,579) | (385,656)
Expected credit loss allowance | (41,634) | (169,726)
Stage 3 [member] | Transfers to Stage 3 [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | 3,505,905 | 2,134,464
Expected credit loss allowance | 2,728,715 | 1,142,321
Stage 3 [member] | Amounts Written Off [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (676,156) | (2,080,269)
Expected credit loss allowance | (433,757) | (1,059,754)
Stage 3 [member] | Monetary effects [member] |  |
Disclosure of internal credit grades [line items] |  |
Gross carrying amount | (1,291,434) | (628,040)
Expected credit loss allowance | $ (1,031,921) | $ (71,088)

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