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Financing instruments payable - Maturity (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Subclassifications of assets, liabilities and equities [Line Items]    
Balances on demand deposits from customers R$ 1,053,491 R$ 1,243,221
Time deposits 75,182,307 51,638,802
Balances on term deposits from customers 75,182,307 51,638,802
Deposits from banks 514,421 624,594
Financial Bills 15,919,950 14,193,253
Financial Liabilities At Amortized Cost, Structured Operations Certificates 23,798,103 20,104,840
Other financing instruments payables 1,898,154 678,775
Market funding operations 118,366,426 88,483,485
Not later than one month [member]    
Subclassifications of assets, liabilities and equities [Line Items]    
Balances on demand deposits from customers 1,053,491 1,243,221
Time deposits 10,550,692 4,337,012
Deposits from banks 0 0
Financial Bills 136,048 385,960
Financial Liabilities At Amortized Cost, Structured Operations Certificates 124,274 69,880
Other financing instruments payables 0 0
Market funding operations 11,864,505 6,036,073
Later than one month and not later than two months [member]    
Subclassifications of assets, liabilities and equities [Line Items]    
Balances on demand deposits from customers 0 0
Time deposits 5,511,955 6,202,542
Deposits from banks 0 0
Financial Bills 99,760 45,916
Financial Liabilities At Amortized Cost, Structured Operations Certificates 262,539 82,304
Other financing instruments payables 0 0
Market funding operations 5,874,254 6,330,762
Later than two months and not later than three months [member]    
Subclassifications of assets, liabilities and equities [Line Items]    
Balances on demand deposits from customers 0 0
Time deposits 5,593,062 10,256,783
Deposits from banks 0 0
Financial Bills 146,006 108,266
Financial Liabilities At Amortized Cost, Structured Operations Certificates 110,315 90,546
Other financing instruments payables 109,865 0
Market funding operations 5,959,248 10,455,595
Later Than 90 Days And Not Later Than 180 Days [Member]    
Subclassifications of assets, liabilities and equities [Line Items]    
Balances on demand deposits from customers 0 0
Time deposits 31,692,610 14,656,194
Deposits from banks 0 0
Financial Bills 1,704,455 432,934
Financial Liabilities At Amortized Cost, Structured Operations Certificates 1,144,806 536,373
Other financing instruments payables 534,118 4
Market funding operations 35,075,989 15,625,505
Later Than 180 Days And Not Later Than 360 Days [Member]    
Subclassifications of assets, liabilities and equities [Line Items]    
Balances on demand deposits from customers 0 0
Time deposits 7,665,880 6,371,748
Deposits from banks 389,784 370,106
Financial Bills 2,992,391 3,779,877
Financial Liabilities At Amortized Cost, Structured Operations Certificates 6,253,426 881,785
Other financing instruments payables 904,307 573,886
Market funding operations 18,205,788 11,977,402
Later Than 360 Days [Member]    
Subclassifications of assets, liabilities and equities [Line Items]    
Balances on demand deposits from customers 0 0
Time deposits 14,168,108 9,814,523
Deposits from banks 124,637 254,488
Financial Bills 10,841,290 9,440,300
Financial Liabilities At Amortized Cost, Structured Operations Certificates 15,902,743 18,443,952
Other financing instruments payables 349,864 104,885
Market funding operations R$ 41,386,642 R$ 38,058,148