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Guarantees, commitments and risks (Details 4) - Strategic liquidity [Member] - EUR (€) € in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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
Sensitivity Dollar Value [Member] |  |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |  |
Value at risk | [2] | 250 | 270
Sensitivity Dollar Value [Member] | Bottom of range [member] |  |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |  |
Value at risk | [2] | 250 | 270
Sensitivity Dollar Value [Member] | Top of range [member] |  |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |  |
Value at risk | [2] | 350 | 410
Sensitivity Dollar Value [Member] | Average [Member] |  |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |  |
Value at risk | [2] | € 290 | € 350
[1] | Management of strategic liquidity portfolio in $currency starting from August 2017.
[2] | Management of strategic liquidity portfolio starting from July 2013.

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