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Risk management (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Risk Management    
Credit risk exposure - customers (Thousand of Reais) R$ 778,881,139 R$ 750,357,060
   Loans and advances to customers, gross (note 9) 602,039,987 599,687,844
   Contingent Liabilities - Guarantees and other sureties (note 43.a) 58,917,343 64,387,753
   Private securities R$ 117,923,809 R$ 86,281,463
Non-performing loans ratio (%) 8.12% 7.03%
Impairment coverage ratio (%) 83.22% 84.44%
Specific credit loss provisions, net of RAWO (*) (Thousand of Reais) R$ 40,694,182 R$ 35,668,907