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Derivative financial instruments (Details 8) - BRL (R$)
R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Futures contract [member] | Hedge Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Curve value R$ (626,619) R$ (5,610)
Market Value 77,325,400 79,915,645
Accounting value 76,698,781 79,910,035
Futures contract [member] | Hedge Objects [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (566,771) (177,822)
Accounting value 75,691,789 77,296,634
Market Value 76,258,560 77,474,456
Hedge Of Securities [Member] | Hedge Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (250,800) (40,187)
Market Value 7,115,000 35,717,857
Accounting value 6,864,200 35,677,670
Hedge Of Securities [Member] | Hedge Objects [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (244,504) 56,491
Accounting value 5,803,656 27,613,484
Market Value 6,048,160 27,556,993
Funding Hedge [Member] | Hedge Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (375,819) 107,854
Market Value 70,210,400 42,558,322
Accounting value 69,834,581 42,666,176
Funding Hedge [Member] | Hedge Objects [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (322,267) (242,324)
Accounting value 69,888,133 48,944,817
Market Value R$ 70,210,400 49,187,141
Credit Operations Hedge [Member] | Hedge Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Curve value   (73,277)
Market Value   1,639,466
Accounting value   1,566,189
Credit Operations Hedge [Member] | Hedge Objects [Member]    
IfrsStatementLineItems [Line Items]    
Curve value   8,011
Accounting value   738,333
Market Value   R$ 730,322