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Risk Management (Details 12) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Offsetting of financial assets and liabilities    
Interbank investments [1] R$ 123,691,195 R$ 84,728,590
Securities sold under agreements to repurchase 233,467,544 241,978,931
Interbank investments    
Offsetting of financial assets and liabilities    
Interbank investments 123,691,195 84,728,590
Related amount offset in the Balance Sheet 0 0
Net amount 123,691,195 84,728,590
Derivative financial instruments    
Offsetting of financial assets and liabilities    
Interbank investments 13,866,885 16,755,442
Related amount offset in the Balance Sheet 0 0
Net amount 13,866,885 16,755,442
Securities sold under agreements to repurchase    
Offsetting of financial assets and liabilities    
Securities sold under agreements to repurchase 233,467,544 241,978,931
Related amount not cleared in the Balance Sheet 0 0
Net amount 233,467,544 241,978,931
Derivative financial instruments    
Offsetting of financial assets and liabilities    
Securities sold under agreements to repurchase 14,274,999 13,435,678
Related amount not cleared in the Balance Sheet 0 0
Net amount R$ 14,274,999 R$ 13,435,678
[1] Refers to reverse repurchase agreements in which the underlying security has subsequently been sold in a separate repurchase agreement.