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Expected Credit Losses on Financial Assets and Reconciliation of carrying amount - ECLs measured using simplified approach (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets that are either past due or impaired [line items]      
Securities - Brazilian sovereign bonds (Note 7A) R$ 365,169,005 R$ 321,697,974  
Expected Credit Loss 799,193 688,978  
Stage 3      
Disclosure of financial assets that are either past due or impaired [line items]      
Securities - Brazilian sovereign bonds (Note 7A) 783,545 406,769 R$ 237,130
Expected Credit Loss 237,301 234,099  
Increase (decrease) in allowance account for credit losses of financial assets (36,675)    
Stage 3 to Stage 1 (72)    
Stage 3 to Stage 2 (23)    
Stage 1 to Stage 3 194,341    
Stage 2 to Stage 3 110,586    
Increase (Decrease) in Write-Off for credit losses of financial assets (264,955)    
Financial assets at amortised cost, category [member]      
Disclosure of financial assets that are either past due or impaired [line items]      
Expected Credit Loss 788,348 650,269  
Financial assets at amortised cost, category [member] | Stage 3      
Disclosure of financial assets that are either past due or impaired [line items]      
Expected Credit Loss   234,099 186,048
Increase (decrease) in allowance account for credit losses of financial assets   (34,201)  
Stage 3 to Stage 2   117,936  
Stage 2 to Stage 3   (184)  
Increase (Decrease) in Write-Off for credit losses of financial assets   (184,349)  
Financial assets at amortised cost, category [member] | Measured Using Simplified Approach      
Disclosure of financial assets that are either past due or impaired [line items]      
Securities - Brazilian sovereign bonds (Note 7A) 24,870,593 20,747,986  
Expected Credit Loss 291,693 236,949  
Financial assets at amortised cost, category [member] | Securities Trading And Intermediation [Member]      
Disclosure of financial assets that are either past due or impaired [line items]      
Expected Credit Loss 147,384 136,872  
Financial assets at amortised cost, category [member] | Securities Trading And Intermediation [Member] | Measured Using Simplified Approach      
Disclosure of financial assets that are either past due or impaired [line items]      
Securities - Brazilian sovereign bonds (Note 7A) 6,446,868 6,635,969  
Expected Credit Loss 147,384 136,872  
Financial assets at amortised cost, category [member] | Trade receivables [member]      
Disclosure of financial assets that are either past due or impaired [line items]      
Expected Credit Loss 123,418 75,885  
Financial assets at amortised cost, category [member] | Trade receivables [member] | Measured Using Simplified Approach      
Disclosure of financial assets that are either past due or impaired [line items]      
Securities - Brazilian sovereign bonds (Note 7A) 1,489,842 854,828  
Expected Credit Loss 123,418 75,885  
Financial assets at amortised cost, category [member] | Others      
Disclosure of financial assets that are either past due or impaired [line items]      
Expected Credit Loss 20,891 24,192  
Financial assets at amortised cost, category [member] | Others | Measured Using Simplified Approach      
Disclosure of financial assets that are either past due or impaired [line items]      
Securities - Brazilian sovereign bonds (Note 7A) 16,933,883 13,257,189  
Expected Credit Loss 20,891 24,192  
Financial assets at amortised cost, category [member] | Loans and credit card operations [Member]      
Disclosure of financial assets that are either past due or impaired [line items]      
Expected Credit Loss 465,098 396,994  
Financial assets at amortised cost, category [member] | Loans and credit card operations [Member] | Stage 3      
Disclosure of financial assets that are either past due or impaired [line items]      
Securities - Brazilian sovereign bonds (Note 7A) 696,165 401,211 231,590
Expected Credit Loss 220,757 230,080 182,282
Increase (decrease) in allowance account for credit losses of financial assets (32,647) (34,416)  
Stage 3 to Stage 1 (72)    
Stage 3 to Stage 2 (23) 117,930  
Stage 1 to Stage 3 177,848    
Stage 2 to Stage 3 110,526 (184)  
Increase (Decrease) in Write-Off for credit losses of financial assets (264,955) (184,349)  
On-balance exposures [Member]      
Disclosure of financial assets that are either past due or impaired [line items]      
Expected Credit Loss 788,348 665,891  
On-balance exposures [Member] | Stage 3      
Disclosure of financial assets that are either past due or impaired [line items]      
Securities - Brazilian sovereign bonds (Note 7A) 770,362 401,211 231,590
Expected Credit Loss 233,007 230,080 182,282
Increase (decrease) in allowance account for credit losses of financial assets (32,647) (34,416)  
Stage 3 to Stage 1 (72)    
Stage 3 to Stage 2 (23) 117,930  
Stage 1 to Stage 3 190,098    
Stage 2 to Stage 3 110,526 (184)  
Increase (Decrease) in Write-Off for credit losses of financial assets (264,955) (184,349)  
Off-Balance Exposures [Member]      
Disclosure of financial assets that are either past due or impaired [line items]      
Expected Credit Loss 10,845 23,087  
Off-Balance Exposures [Member] | Stage 3      
Disclosure of financial assets that are either past due or impaired [line items]      
Securities - Brazilian sovereign bonds (Note 7A) 13,183 5,558 5,540
Expected Credit Loss 4,294 4,019 R$ 3,766
Increase (decrease) in allowance account for credit losses of financial assets (4,028) 215  
Stage 3 to Stage 1 0    
Stage 3 to Stage 2 0 6  
Stage 1 to Stage 3 4,243    
Stage 2 to Stage 3 60 0  
Increase (Decrease) in Write-Off for credit losses of financial assets R$ 0 R$ 0