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Financial Instruments Risks - Summary of Credit Quality Analysis of Loans and Advances (Detail) - ARS ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of internal credit grades [line items]    
Credit exposure $ 971,401,776 $ 937,124,635
Loans to consumers [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 307,780,384 215,070,347
Loans to corporate entities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 194,484,377 325,204,319
Debt securities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 189,604,963 192,516,731
Cash And Cash Equivalents [Member]    
Disclosure of internal credit grades [line items]    
Credit exposure 141,983,557 130,088,223
Reverse Repurchase Agreements    
Disclosure of internal credit grades [line items]    
Credit exposure 137,548,495 74,245,015
Reverse Repurchase Agreements | BCRA Repos [Member]    
Disclosure of internal credit grades [line items]    
Credit exposure 137,548,495 74,245,015
Low Risk [Member] | Loans to consumers [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 233,760,286 147,560,865
Low Risk [Member] | Loans to corporate entities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 146,126,778 211,975,032
Low Risk [Member] | Cash And Cash Equivalents [Member] | BCRA Unrestricted Current Account    
Disclosure of internal credit grades [line items]    
Credit exposure 141,983,557 130,088,223
Medium Risk [Member] | Loans to consumers [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 66,480,022 40,038,038
Medium Risk [Member] | Loans to corporate entities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 41,292,892 103,514,198
High Risk [Member] | Loans to consumers [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 1,373,163 23,061,160
High Risk [Member] | Loans to corporate entities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 3,572,141 5,905,963
Non Performing [Member] | Loans to consumers [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 6,166,913 4,410,284
Non Performing [Member] | Loans to corporate entities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 3,492,566 3,809,126
Corporate Bonds B [Member]    
Disclosure of internal credit grades [line items]    
Credit exposure 911,442  
BCRA Liquidity Bills [Member] | Debt securities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 107,693,328 135,681,602
Government securities [member] | Debt securities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure 80,552,118 56,441,307
Corporate bonds [Member] | Debt securities [member]    
Disclosure of internal credit grades [line items]    
Credit exposure $ 448,075 $ 393,822