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Provisions - Summary of Changes in Provisions (Detail) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of other provisions [line items]    
Amounts at beginning of fiscal year $ 1,978,115 $ 3,027,969
Increases 1,874,394 1,718,138
Decreases Reversals 252 12
Decreases Charge Off 1,543,737 1,916,553
Monetary effects (654,963) (851,427)
Amounts at the end of fiscal year 1,653,557 1,978,115
For administrative, disciplinary and criminal penalties [member]    
Disclosure of other provisions [line items]    
Amounts at beginning of fiscal year 1,084 1,476
Increases 41,631  
Decreases Reversals 252  
Decreases Charge Off 41,576  
Monetary effects (387) (392)
Amounts at the end of fiscal year 500 1,084
Letter of credit, guarantee and other commitments [member]    
Disclosure of other provisions [line items]    
Amounts at beginning of fiscal year [1] 35,018 35,493
Increases 376,539 24,555 [1]
Decreases Charge Off 1,271 13,016 [1]
Monetary effects (57,201) (12,014) [1]
Amounts at the end of fiscal year 353,085 35,018 [1]
Commercial claims in progress [member]    
Disclosure of other provisions [line items]    
Amounts at beginning of fiscal year 1,040,165 1,725,021
Increases 372,302 303,157
Decreases Reversals   12
Decreases Charge Off 855,478 527,958
Monetary effects (239,452) (460,043)
Amounts at the end of fiscal year 317,537 1,040,165
Legal proceedings provision [member]    
Disclosure of other provisions [line items]    
Amounts at beginning of fiscal year 343,771 364,409
Increases 266,424 162,028
Decreases Charge Off 281,466 79,996
Monetary effects (113,335) (102,670)
Amounts at the end of fiscal year 215,394 343,771
Pension Funds - Reimbursement [member]    
Disclosure of other provisions [line items]    
Amounts at beginning of fiscal year 134,112 328,482
Increases 41,362 23,541
Decreases Charge Off 18,283 158,849
Monetary effects (50,931) (59,062)
Amounts at the end of fiscal year 106,260 134,112
Miscellaneous other provisions [member]    
Disclosure of other provisions [line items]    
Amounts at beginning of fiscal year 423,965 573,088
Increases 776,136 1,204,857
Decreases Charge Off 345,663 1,136,734
Monetary effects (193,657) (217,246)
Amounts at the end of fiscal year $ 660,781 $ 423,965
[1] These amounts correspond to the ECL calculated for contingent transactions, which are mentioned in note 4.