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Guarantees, commitments and risks (Details 4) - 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
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.