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Derivative financial instruments (Details 6) - BRL (R$) R$ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Swap contract [member] | Hedge Instruments [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Curve Value | R$ 107,845 | R$ 30,481
Fair Value | 1,664,551 | 222,625
Accounting Value | 1,772,396 | 253,106
Swap contract [member] | Hedge Instruments [Member] | Loan Operations Hedge [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Curve Value | 42,513 | 30,481
Fair Value | 1,166,421 | 222,625
Accounting Value | 1,208,934 | 253,106
Swap contract [member] | Hedge Instruments [Member] | Securities Hedge [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Curve Value | 65,332 |
Fair Value | 498,130 |
Accounting Value | 563,462 |
Swap contract [member] | Hedge Objects [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Curve Value | 108,402 | 10,979
Fair Value | 1,664,551 | 200,658
Accounting Value | 1,772,953 | 211,637
Swap contract [member] | Hedge Objects [Member] | Loan Operations Hedge [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Curve Value | 39,902 | 10,979
Fair Value | 1,166,421 | 200,658
Accounting Value | 1,206,323 | 211,637
Swap contract [member] | Hedge Objects [Member] | Securities Hedge [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Curve Value | 68,500 |
Fair Value | 498,130 |
Accounting Value | 566,630 |
Futures contract [member] | Hedge Instruments [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Curve Value | 588,237 | 160,951
Fair Value | 58,383,294 | 43,416,076
Accounting Value | 58,971,531 | 43,577,027
Futures contract [member] | Hedge Instruments [Member] | Loan Operations Hedge [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Curve Value | 196,301 | 156,408
Fair Value | 1,384,510 | 13,238,024
Accounting Value | 1,580,811 | 13,394,432
Futures contract [member] | Hedge Instruments [Member] | Securities Hedge [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Fair Value | 52,602,490 | 25,344,183
Accounting Value | 52,690,842 | 25,201,977
Futures contract [member] | Hedge Instruments [Member] | Funding Hedge [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Curve Value | 303,584 | 146,749
Fair Value | 4,396,294 | 4,833,869
Accounting Value | 4,699,878 | 4,980,618
Futures contract [member] | Hedge Objects [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Curve Value | 516,518 | (222,149)
Fair Value | 61,963,365 | 38,332,070
Accounting Value | 62,479,883 | 38,109,921
Futures contract [member] | Hedge Objects [Member] | Loan Operations Hedge [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Curve Value | 169,359 | (54,560)
Fair Value | 1,565,217 | 10,017,522
Accounting Value | 1,734,576 | 9,962,962
Futures contract [member] | Hedge Objects [Member] | Securities Hedge [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Fair Value | 55,116,924 | 22,504,539
Accounting Value | 55,187,708 | 22,717,743
Futures contract [member] | Hedge Objects [Member] | Funding Hedge [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Curve Value | 276,375 | (380,793)
Fair Value | 5,281,224 | 5,810,009
Accounting Value | 5,557,599 | 5,429,216
Securities Hedge [Member] | Hedge Instruments [Member] | Securities Hedge [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Curve Value | 88,352 | (142,206)
Securities Hedge [Member] | Hedge Objects [Member] | Securities Hedge [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Curve Value | R$ 70,784 | R$ 213,204

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