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Risk Management (Details 30) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial assets - Financial assets pledged as collateral      
Securities purchased under agreements to resell [1] R$ 123,691,195 R$ 84,728,590  
Investments held to maturity 39,006,118 43,002,028  
Loans and receivables      
Loans and advances to banks, net of impairment [2] 32,247,724 94,838,136  
Loans and advances to customers, net of impairment [2] 346,758,099 367,303,034  
Financial liabilities      
Deposits from banks 285,957,468 301,662,682  
Deposits from customers 262,008,445 232,747,929  
Funds from issuance of securities 135,174,090 151,101,938  
Balance 50,179,401 52,611,064 R$ 50,282,936
Fair Value      
Financial assets - Financial assets pledged as collateral      
Securities purchased under agreements to resell 123,691,195 84,728,590  
Investments held to maturity 41,146,271 44,254,749  
Loans and receivables      
Loans and advances to banks, net of impairment [2] 32,247,724 94,838,136  
Loans and advances to customers, net of impairment [2] 346,633,592 362,156,027  
Financial liabilities      
Deposits from banks 285,716,505 301,497,406  
Deposits from customers 261,760,442 232,224,796  
Funds from issuance of securities 134,890,631 151,622,981  
Balance 51,012,436 53,436,792  
Fair Value | Level 1      
Financial assets - Financial assets pledged as collateral      
Investments held to maturity 29,182,489 32,875,426  
Fair Value | Level 2      
Financial assets - Financial assets pledged as collateral      
Securities purchased under agreements to resell 123,691,195 84,728,590  
Investments held to maturity 11,963,782 11,379,323  
Loans and receivables      
Loans and advances to banks, net of impairment [2] 32,247,724 94,838,136  
Fair Value | Level 3      
Loans and receivables      
Loans and advances to customers, net of impairment [2] 346,633,592 362,156,027  
Financial liabilities      
Deposits from banks 285,716,505 301,497,406  
Deposits from customers 261,760,442 232,224,796  
Funds from issuance of securities 134,890,631 151,622,981  
Balance R$ 51,012,436 R$ 53,436,792  
[1] Refers to reverse repurchase agreements in which the underlying security has subsequently been sold in a separate repurchase agreement.
[2] Amounts of loans and receivables are presented net of the provision for impairment losses.