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Net interest income (Tables)
 12 Months Ended
Dec. 31, 2025
Interest income1 [Abstract]  
Summary of Interest Income
21.1. Interest income
 202520242023
Interest from commercial papers and notes936,559,886 762,890,456 952,693,896 
Interest from government securities813,984,609 835,435,997 3,290,206,169 
Interest from credit card loans784,477,707 568,139,062 803,661,172 
Interest from consumer loans757,233,199 401,920,077 373,169,446 
Interest from other loans545,679,227 325,990,376 486,600,151 
Interest from overdrafts459,785,211 398,613,271 504,122,894 
CER clause adjustment (1)377,730,451 1,301,945,014 1,085,457,592 
UVA clause adjustment (2)180,275,695 290,768,978 319,910,898 
Interest from pledge loans147,917,688 81,996,072 105,405,119 
Interest from loans for the prefinancing and financing of exports115,867,339 21,916,652 6,888,212 
Interest on loans to the financial institutions72,744,244 22,095,661 18,348,721 
Interest from mortgage loans36,002,504 20,174,400 18,510,280 
Interest from financial leases16,891,440 17,042,378 27,087,723 
Interest from private securities4,425,625 5,733,351 9,921,173 
Premium for reverse repurchase agreements293,225 1,112,693,899 1,112,100,220 
Other financial interest income46,530,074 10,458,576 6,734,255 
                                                        TOTAL5,296,398,124 6,177,814,220 9,120,817,921 
(1)CER (Reference stabilization coefficient) adjustment clause based on the variation of the consumer price index.
(2)UVA (Purchasing Value Unit): It is a unit of measure that is updated daily according to the CER.
Summary of Interest Expenses
21.2. Interest expenses
202520242023
Interest from time deposits1,908,545,742 1,393,518,433 3,333,345,256 
Interest from current accounts deposits345,796,839 625,752,727 892,453,109 
Interest from other financial liabilities139,874,624 28,621,067 13,257,467 
Interest from bank loans120,259,285 55,224,623 72,491,430 
Premium for reverse repurchase agreements26,679,410 1,066,557 71,578 
UVA clause adjustment (1)14,186,559 175,464,814 122,418,032 
Borrowing surety bond transactions10,268,952 15,654,376 — 
Interest from savings accounts deposits8,077,793 24,119,382 20,500,688 
Interest on the lease liability5,009,579 5,394,272 4,867,434 
                                                        TOTAL2,578,698,783 2,324,816,251 4,459,404,994 
(1)UVA (Purchasing Value Unit): It is a unit of measure that is updated daily according to the CER.