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Risk Management (Details 4) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loans And Advances To Customers The Internal Models Used By The Organization Are Based On Client Or Product [Abstract]      
Neither past due nor impaired R$ 321,595,918 R$ 337,337,152  
Past due but not impaired (ii) 10,684,314 12,612,906  
Impaired (iii) 41,533,433 42,133,815  
Total Portfolio 373,813,665 392,083,873  
Impairment of loans and advances (27,055,566) (24,780,839) R$ (25,455,204)
Total of net loans and advances to customers [1] R$ 346,758,099 R$ 367,303,034  
[1] Amounts of loans and receivables are presented net of the provision for impairment losses.