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Derivative financial instruments (Details 6) - BRL (R$)
R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
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