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Income tax - Summary of components of deferred tax assets and deferred tax liabilities (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax liability (asset) R$ 2,881,426 R$ 2,622,645 R$ 2,017,771 R$ 1,500,839
Deferred tax expense (income) 258,781 604,874 516,932  
Deferred tax assets 3,370,919 2,887,935    
Deferred tax liabilities (489,493) (265,290)    
Unused tax losses [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax liability (asset) 1,137,635 1,051,966    
Deferred tax expense (income) 85,669 309,721 167,125  
Goodwill on business combinations        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax liability (asset) 65,886 51,319    
Deferred tax expense (income) 14,567 15,496 29,447  
Provisions for IFA's Coommissions [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax liability (asset) 86,854 84,756    
Deferred tax expense (income) 2,098 (5,319) 18,089  
Revaluations of Financial Assets at Fair Value [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax liability (asset) 277,750 294,986    
Deferred tax expense (income) (17,236) 461,267 48,175  
Allowance for credit losses [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax liability (asset) 373,261 334,006    
Deferred tax expense (income) 39,255 (1,705) 277,503  
Profit Sharing Plan [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax liability (asset) 329,517 298,539    
Deferred tax expense (income) 30,978 19,556 9,034  
Net Gain on Hedge Instruments [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax liability (asset) (41,076) (31,854)    
Deferred tax expense (income) (9,222) (9,150) (11,535)  
Share-base Compensation [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax liability (asset) 375,420 558,744    
Deferred tax expense (income) (183,324) (68,986) 61,009  
Classes of other provisions [domain]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Deferred tax liability (asset) 276,179 (19,817)    
Deferred tax expense (income) R$ 295,996 R$ (116,006) R$ (81,915)