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Accounting Items That Identify the Compliance With Minimum Cash Requirements - Summary of Minimum Cash Requirement Constitute by Bank (Detail) - Banco Macro SA [member] $ in Thousands	Dec. 31, 2020 ARS ($)
Disclosure of accounts showing compliance with minimum cash requirements [line items]
Cash requirement constitute by bank	$ 126,977,345
BCRA accounts [member] \| Cash and deposits in banks [member]
Disclosure of accounts showing compliance with minimum cash requirements [line items]
Cash requirement constitute by bank	49,994,923
Central bank bills [member] \| Other debt securities 1 [member]
Disclosure of accounts showing compliance with minimum cash requirements [line items]
Cash requirement constitute by bank	47,216,670
Government securities [member] \| Other debt securities 1 [member]
Disclosure of accounts showing compliance with minimum cash requirements [line items]
Cash requirement constitute by bank	17,725,006
Special guarantees accounts in the BCRA [member] \| Financial assets delivered as guarantee [member]
Disclosure of accounts showing compliance with minimum cash requirements [line items]
Cash requirement constitute by bank	$ 12,040,746