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Securities - Summary of Securities at Fair Value Through Other Comprehensive Income (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial assets [line items]    
Financial assets at fair value through other comprehensive income R$ 42,223,349 R$ 50,879,981
Gains (losses) on financial assets at fair value through profit or loss 65,250 229,599
Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets at fair value through other comprehensive income 42,965,360 53,250,910
Fair value adjustments through OCI [Member]    
Disclosure of financial assets [line items]    
Financial assets at fair value through other comprehensive income (742,012) (2,370,929)
At fair value [member]    
Disclosure of financial assets [line items]    
Financial assets at fair value through other comprehensive income 42,223,349 50,879,981
National Treasury Bills | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets at fair value through other comprehensive income 39,785,892 49,357,469
National Treasury Bills | Fair value adjustments through OCI [Member]    
Disclosure of financial assets [line items]    
Financial assets at fair value through other comprehensive income (742,177) (2,376,462)
National Treasury Bills | At fair value [member]    
Disclosure of financial assets [line items]    
Financial assets at fair value through other comprehensive income 39,043,715 46,981,007
Foreign sovereign bonds | Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Financial assets at fair value through other comprehensive income 3,179,468 3,893,441
Foreign sovereign bonds | Fair value adjustments through OCI [Member]    
Disclosure of financial assets [line items]    
Financial assets at fair value through other comprehensive income 165 5,533
Foreign sovereign bonds | At fair value [member]    
Disclosure of financial assets [line items]    
Financial assets at fair value through other comprehensive income R$ 3,179,634 R$ 3,898,974