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Risk management (Details 8)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
BRL (R$)
Interest Rate Reais [Member]  
IfrsStatementLineItems [Line Items]  
Description Exposures subject to changes in interest fixed rate
Interest Rate Reais [Member] | Trading Scenario A [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (2,631)
Interest Rate Reais [Member] | Trading Scenario B [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor (75,831)
Interest Rate Reais [Member] | Trading Scenario C [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (151,662)
Coupon Interest Rate [Member]  
IfrsStatementLineItems [Line Items]  
Description Exposures subject to changes in coupon rate of interest rate
Coupon Interest Rate [Member] | Trading Scenario A [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (97)
Coupon Interest Rate [Member] | Trading Scenario B [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor (1,193)
Coupon Interest Rate [Member] | Trading Scenario C [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (2,386)
Inflation [Member]  
IfrsStatementLineItems [Line Items]  
Description Exposures subject to change in coupon rates of price indexes
Inflation [Member] | Trading Scenario A [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (312)
Inflation [Member] | Trading Scenario B [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor (2,459)
Inflation [Member] | Trading Scenario C [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (4,917)
Coupon U S Dollar [Member]  
IfrsStatementLineItems [Line Items]  
Description Exposures subject to changes in coupon US Dollar rate
Coupon U S Dollar [Member] | Trading Scenario A [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (7,475)
Coupon U S Dollar [Member] | Trading Scenario B [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor (67,976)
Coupon U S Dollar [Member] | Trading Scenario C [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (135,952)
Coupon Other Currencies [Member]  
IfrsStatementLineItems [Line Items]  
Description Exposures subject to changes in coupon foreign currency  rate
Coupon Other Currencies [Member] | Trading Scenario A [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (844)
Coupon Other Currencies [Member] | Trading Scenario B [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor (6,166)
Coupon Other Currencies [Member] | Trading Scenario C [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (12,331)
Foreign Currency [Member]  
IfrsStatementLineItems [Line Items]  
Description Exposures subject to foreign exchange
Foreign Currency [Member] | Trading Scenario A [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (6,399)
Foreign Currency [Member] | Trading Scenario B [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor (159,984)
Foreign Currency [Member] | Trading Scenario C [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (319,968)
Eurobond Treasury Global [Member]  
IfrsStatementLineItems [Line Items]  
Description Exposures subject to Interest Rate Variation on Papers Traded on the International Market
Eurobond Treasury Global [Member] | Trading Scenario A [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (6,634)
Eurobond Treasury Global [Member] | Trading Scenario B [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor (59,608)
Eurobond Treasury Global [Member] | Trading Scenario C [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (119,215)
Shares And Indexes [Member]  
IfrsStatementLineItems [Line Items]  
Description Exposures subject to change in shares price
Shares And Indexes [Member] | Trading Scenario A [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (907)
Shares And Indexes [Member] | Trading Scenario B [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor (22,679)
Shares And Indexes [Member] | Trading Scenario C [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (45,357)
Commodities [Member]  
IfrsStatementLineItems [Line Items]  
Description Exposures subject to change in commodities' prices
Commodities [Member] | Trading Scenario A [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (16)
Commodities [Member] | Trading Scenario B [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor (405)
Commodities [Member] | Trading Scenario C [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor (809)
Trading Portfolio Total [Member] | Trading Scenario A [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor (25,315)
Trading Portfolio Total [Member] | Trading Scenario B [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor (396,301)
Trading Portfolio Total [Member] | Trading Scenario C [Member]  
IfrsStatementLineItems [Line Items]  
Trading portfolio risk factor R$ (792,597)