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Risk Management (Details 9) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Renegotiated Loans And Advances To Customers [Abstract]    
Opening balance R$ 17,501,423 R$ 12,728,723
Additional renegotiated amounts, including interest 16,185,863 18,777,814
Payments received (10,108,040) (8,997,802)
Write-offs (6,395,377) (5,007,312)
Closing balance 17,183,869 17,501,423
Impairment of loans and advances (10,853,777) (10,346,397)
Total renegotiated loans and advances to customers, net of impairment at the end of the year R$ 6,330,092 R$ 7,155,026
Impairment on renegotiated loans and advances as a percentage of the renegotiated portfolio 63.20% 59.10%
Total renegotiated loans and advances as a percentage of the total loan portfolio 4.60% 4.50%
Total renegotiated loans and advances as a percentage of the total loan portfolio, net of impairment 1.80% 1.90%