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Guarantees, commitments and risks (Details 5) - Strategic liquidity [Member] - EUR (€) € in Thousands		Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Contingent Liabilities Explanatory [Line Items]
Value at risk	[1]	€ 20	€ 30
Bottom of range [member]
Disclosure Of Contingent Liabilities Explanatory [Line Items]
Value at risk	[1]	10	20
Top of range [member]
Disclosure Of Contingent Liabilities Explanatory [Line Items]
Value at risk	[1]	40	40
Average [Member]
Disclosure Of Contingent Liabilities Explanatory [Line Items]
Value at risk	[1]	€ 20	€ 30
[1] Management of strategic liquidity portfolio in $currency starting from August 2017.

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The measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 41
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_41&doctype=Standard
-URIDate 2018-03-16

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