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Transactions with related parties (Details Text) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Transactions with related parties (Details Text)
Remuneration of key management personnel	R$ 468,700
Remuneration of key management personnel - Defined contribution pension plans	R$ 487,700
Policy on Management compensation	50.00%
Individuals or corporations that own, their capital
Transactions with related parties (Details Text)
Financial institutions are not allowed to grant loans or advances	10.00%
Corporations in which the financial institution itself, any officers or administrators of the institution, as well as their spouses and respective family members up to the second degree, have equity
Transactions with related parties (Details Text)
Financial institutions are not allowed to grant loans or advances	10.00%
Common shares
Transactions with related parties (Details Text)
Direct and indirect shareholding of the members of Board of Directors and Board of Executive Officers	2.30%	2.80%
Preferred shares
Transactions with related parties (Details Text)
Direct and indirect shareholding of the members of Board of Directors and Board of Executive Officers	1.10%	1.20%
All shares
Transactions with related parties (Details Text)
Direct and indirect shareholding of the members of Board of Directors and Board of Executive Officers	1.70%	2.00%

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- Definition

Direct and indirect shareholding of the members of Board of Directors and Board of Executive Officers

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Transactions with related parties (Details Text)

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The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of compensation to key management personnel in the form of other long-term employee benefits. [Refer: Other long-term employee benefits; Key management personnel of entity or parent [member]]

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