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Risk Management (Details 26) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of all assets and liabilities measured at fair value      
Balance on R$ 447,131,742 R$ 383,380,709  
Level 3      
Reconciliation of all assets and liabilities measured at fair value      
Balance on 7,238,831 5,291,960 R$ 6,274,018
Included in the statement of income and other comprehensive income (719,134) (1,161,070)  
Acquisitions 4,098,466 2,194,071  
Write-offs (1,432,461) (452,834)  
Transfer levels   (1,562,225)  
Level 3 | Derivatives      
Reconciliation of all assets and liabilities measured at fair value      
Balance on (4,903) (8,617) (20,382)
Acquisitions 3,714 11,793  
Write-offs   (28)  
Level 3 | Financial assets held for trading      
Reconciliation of all assets and liabilities measured at fair value      
Balance on 352,446 287,224 209,210
Included in the statement of income and other comprehensive income 15,868 13,155  
Acquisitions 74,908 3,833  
Write-offs (25,554) (7,633)  
Transfer with categories   274,001  
Transfer levels   (205,342)  
Level 3 | Financial assets available for sale      
Reconciliation of all assets and liabilities measured at fair value      
Balance on 6,891,288 5,013,353 R$ 6,085,190
Included in the statement of income and other comprehensive income (735,002) (1,174,225)  
Acquisitions 4,019,844 2,178,445  
Write-offs R$ (1,406,907) (445,173)  
Transfer with categories   (274,001)  
Transfer levels   R$ (1,356,883)