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Fair value of financial assets and liabilities (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |
Financial assets at fair value through profit or loss, mandatorily measured at fair value | R$ 262,407,149 | R$ 231,001,886
Debt instruments | 95,546,026 | 107,585,055
Equity instruments | 4,862,393 | 2,968,823
Derivatives | 65,590,206 | 40,175,818
Loans and advances to customers | 6,413,587 | 4,911,803
Reserves at the Central Bank of Brazil | 89,994,937 | 75,360,387
Financial Assets Measured At Fair Value Through Profit Or Loss Held For Trading | 69,446,583 | 92,078,540
Comprehensive Income Debt instruments | 69,354,220 | 92,058,907
Comprehensive Income Equity instruments | 92,363 | 19,633
Hedging derivatives (assets) | 217,492 | 30,481
Financial Liabilities Measured At Fair Value Through Profit Or Loss | 112,471,311 | 82,722,610
Derivatives | 59,827,986 | 39,280,448
Short positions | 49,380,059 | 39,396,666
Bonds and securities obligations | 3,263,266 | 4,045,496
Hedging derivatives (liabilities) | 184,005 | 129,826
Level 1 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets at fair value through profit or loss, mandatorily measured at fair value | 84,368,028 | 90,905,041
Debt instruments | 79,505,635 | 88,260,075
Equity instruments | 4,862,393 | 2,644,966
Financial Assets Measured At Fair Value Through Profit Or Loss Held For Trading | 65,444,645 | 88,640,516
Comprehensive Income Debt instruments | 65,444,625 | 88,620,903
Comprehensive Income Equity instruments | 20 | 19,613
Level 2 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets at fair value through profit or loss, mandatorily measured at fair value | 174,725,164 | 132,973,627
Debt instruments | 14,889,571 | 15,624,289
Equity instruments |  | 296,834
Derivatives | 64,266,589 | 39,468,524
Loans and advances to customers | 5,574,067 | 2,223,593
Reserves at the Central Bank of Brazil | 89,994,937 | 75,360,387
Hedging derivatives (assets) | 217,492 | 30,481
Financial Liabilities Measured At Fair Value Through Profit Or Loss | 110,545,164 | 82,213,242
Derivatives | 57,901,839 | 38,771,080
Short positions | 49,380,059 | 39,396,666
Bonds and securities obligations | 3,263,266 | 4,045,496
Hedging derivatives (liabilities) | 184,005 | 129,826
Level 3 of fair value hierarchy [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets at fair value through profit or loss, mandatorily measured at fair value | 3,313,957 | 7,123,218
Debt instruments | 1,150,820 | 3,700,691
Equity instruments |  | 27,023
Derivatives | 1,323,617 | 707,294
Loans and advances to customers | 839,520 | 2,688,210
Financial Assets Measured At Fair Value Through Profit Or Loss Held For Trading | 4,001,938 | 3,438,024
Comprehensive Income Debt instruments | 3,909,595 | 3,438,004
Comprehensive Income Equity instruments | 92,343 | 20
Financial Liabilities Measured At Fair Value Through Profit Or Loss | 1,926,147 | 509,368
Derivatives | R$ 1,926,147 | R$ 509,368

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