Loans and advances to customers (Details 3) - BRL (R$) R$ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Gross Investments In Financial Leases Receivable [Abstract]
Up to one year	R$ 1,118,286	R$ 1,418,546
From one to five years	1,082,149	1,279,347
Over five years	49,424	40,718
Impairment loss on finance leases	(146,812)	(186,594)
Total	2,103,047	2,552,017
Net investments in finance leases:
Up to one year	1,034,188	1,300,659
From one to five years	1,021,089	1,212,322
Over five years	R$ 47,770	R$ 39,036

The gross investment in the finance lease discounted at the interest rate implicit in the lease. Finance lease is a lease that transfers substantially all the risks and rewards incidental to ownership of an underlying asset. Gross investment in the finance lease is the sum of: (a) the lease payments receivable by a lessor under a finance lease; and (b) any unguaranteed residual value accruing to the lessor. Interest rate implicit in the lease is the rate of interest that causes the present value of (a) the lease payments and (b) the unguaranteed residual value to equal to the sum of (i) the fair value of the underlying asset and (ii) the initial direct costs of the lessor.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2019-01-01
-Name IFRS
-Number 16
-IssueDate 2017-01-01
-Paragraph 94
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2017-03-01&anchor=para_94&doctype=Standard
-URIDate 2017-03-09

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant