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Net interest income (Details 1) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest And Similar Income [Abstract]      
Loans and advances to banks R$ 5,073,435 R$ 8,689,348 R$ 8,349,194
Loans and advances to customers:      
- Loans 64,767,081 69,530,396 62,472,012
- Leasing transactions 254,009 343,626 444,502
Financial assets:      
- For trading 13,684,574 23,576,526 13,982,927
- Available for sale 11,351,320 11,572,618 11,629,493
- Held to maturity 4,883,103 6,514,933 5,253,616
Pledged as collateral 21,268,934 21,739,202 20,270,191
Compulsory deposits with the Central Bank 4,881,319 5,667,516 4,587,412
Other financial interest income 68,553 66,210 58,905
Total 126,232,328 147,700,375 127,048,252
Deposits from banks:      
- Interbank deposits (152,550) (127,617) (74,814)
- Funding in the open market (22,564,515) (26,767,039) (23,509,785)
- Borrowings and onlending (3,068,552) (3,865,411) (3,092,184)
Deposits from customers:      
- Savings accounts (5,730,457) (6,712,509) (6,450,258)
- Time deposits (7,536,161) (8,746,203) (5,942,386)
Funds from issuance of securities (13,262,613) (17,124,502) (11,570,606)
Subordinated debt (5,100,017) (6,298,555) (4,669,830)
Insurance technical provisions and pension plans (18,174,550) (21,395,550) (16,102,347)
Total (75,589,415) (91,037,386) (71,412,210)
Net interest income R$ 50,642,913 R$ 56,662,989 R$ 55,636,042