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Intangible assets and goodwill (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in intangible assets and goodwill by class      
Balance originating from an acquired institution [1] R$ 3,743,704 R$ 8,773,545  
Additions/(reductions) 3,743,704 2,343,497  
Impairment [2] (30,683) (212,374)  
Amortization (3,331,240) (2,516,777)  
Balance on 16,179,307 15,797,526 R$ 7,409,635
Goodwill      
Change in intangible assets and goodwill by class      
Balance originating from an acquired institution [1] 0 4,221,787  
Additions/(reductions) 0    
Impairment [2] 0    
Amortization 0    
Balance on 4,945,313 4,945,313 723,526
Acquisition of financial service rights      
Change in intangible assets and goodwill by class      
Balance originating from an acquired institution [1],[3] 0 264,349  
Additions/(reductions) [3] 2,549,335 930,190  
Impairment [2],[3] 0    
Amortization [3] (1,000,894) (951,115)  
Balance on [3] 4,051,898 2,503,457 2,260,033
Software      
Change in intangible assets and goodwill by class      
Balance originating from an acquired institution [1],[3] 0 288,826  
Additions/(reductions) [3] 1,203,313 1,284,041  
Impairment [2],[3] (30,683) (212,374)  
Amortization [3] (1,327,456) (1,055,074)  
Balance on [3] 3,790,418 3,945,244 3,639,825
Customer portfolio      
Change in intangible assets and goodwill by class      
Balance originating from an acquired institution [1],[3] 0 3,993,743  
Additions/(reductions) [3] 0    
Impairment [2],[3] 0    
Amortization [3] (1,000,234) (344,283)  
Balance on [3] 3,358,689 4,358,923 709,463
Others      
Change in intangible assets and goodwill by class      
Balance originating from an acquired institution [1],[3] 0 4,840  
Additions/(reductions) [3] (8,944) 129,266  
Impairment [2],[3] 0    
Amortization [3] (2,656) (166,305)  
Balance on [3] R$ 32,989 R$ 44,589 R$ 76,788
[1] HSBC Brasil; and
[2] Impairment losses were recognized in the consolidated statement of income, within 'Other operating income/(expenses)'.
[3] Rate of amortization: acquisition of banking rights - in accordance with contract agreement; software - 20%; Customer portfolio - up to 20%; and others - 20%;