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Capital Management, Corporate Governance Transparency Policy and Risk Management - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
ARS ($)
Director
Board_member
Branches
Dec. 31, 2019
ARS ($)
Disclosure of detailed information about financial instruments [line items]    
Number of board of directors | Board_member 13  
Number of independent directors | Director 6  
Percentage of high liquidity assets portfolio 25.00%  
Percentage of the refinanced principal not yet settled 5.00%  
Percentage of confidence level 99.00%  
Liabilities $ 622,983,252 $ 461,759,370
Bank and similar charges 150,654  
Loans to consumers 3,083,342  
Loans and advances to banks 3,679,382  
Impairment credit losses $ 445,386  
Bottom of range [member] | Low Risk Customer [Member] | Stage 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Number of arrear days upon impairment 5 days  
Bottom of range [member] | No Low Risk Customer [Member] | Stage 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Number of arrear days upon impairment 31 days  
Bottom of range [member] | No Low Risk Customer [Member] | Stage 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Number of arrear days upon impairment 30 days  
Number of arrear days upon increase risk for PD comparison 31 days  
Top of range [member] | Low Risk Customer [Member] | Stage 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Number of arrear days upon increase risk for PD comparison 4 days  
Top of range [member] | Low Risk Customer [Member] | Stage 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Number of arrear days upon impairment 30 days  
Number of arrear days upon increase risk for PD comparison 4 days  
Top of range [member] | Low Risk Customer [Member] | Stage 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Number of arrear days upon impairment 90 days  
Top of range [member] | No Low Risk Customer [Member] | Stage 1 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Number of arrear days upon increase risk for PD comparison 0 days  
Top of range [member] | No Low Risk Customer [Member] | Stage 2 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Number of arrear days upon impairment 30 days  
Number of arrear days upon increase risk for PD comparison 31 days  
Top of range [member] | No Low Risk Customer [Member] | Stage 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Number of arrear days upon impairment 90 days  
Top of range [member] | Nonlow Risk [Member] | Small And Medium Size Companies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities $ 72,640  
Top of range [member] | Nonlow Risk [Member] | Agricultural Companies [Member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities $ 72,640  
Banco Macro SA [member]    
Disclosure of detailed information about financial instruments [line items]    
Number of branches | Branches 463  
Liabilities $ 603,048,974 $ 457,560,065