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Other Information - Executive Compensation (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Chairman              
Disclosure of transactions between related parties [line items]              
Total   € 1,923,100 € 1,923,100 € 1,923,100 € 1,923,100 € 1,923,100 € 1,923,100 € 1,923,100
Board of Directors | Chairman              
Disclosure of transactions between related parties [line items]              
Total   240,000            
Board of Directors | Vice chairman              
Disclosure of transactions between related parties [line items]              
Total   200,000            
Board of Directors | Executive Member              
Disclosure of transactions between related parties [line items]              
Total   0            
Board of Directors | Proprietary Member              
Disclosure of transactions between related parties [line items]              
Total   120,000            
Board of Directors | Independent Member              
Disclosure of transactions between related parties [line items]              
Total   120,000            
Board of Directors | Other external              
Disclosure of transactions between related parties [line items]              
Total   120,000            
Executive Commission | Chairman              
Disclosure of transactions between related parties [line items]              
Total   80,000            
Executive Commission | Vice chairman              
Disclosure of transactions between related parties [line items]              
Total   80,000            
Executive Commission | Executive Member              
Disclosure of transactions between related parties [line items]              
Total   0            
Executive Commission | Proprietary Member              
Disclosure of transactions between related parties [line items]              
Total   80,000            
Executive Commission | Independent Member              
Disclosure of transactions between related parties [line items]              
Total   80,000            
Executive Commission | Other external              
Disclosure of transactions between related parties [line items]              
Total   80,000            
Advisory or Control Committees | Chairman              
Disclosure of transactions between related parties [line items]              
Total   22,400            
Advisory or Control Committees | Vice chairman              
Disclosure of transactions between related parties [line items]              
Total   0            
Advisory or Control Committees | Executive Member              
Disclosure of transactions between related parties [line items]              
Total   0            
Advisory or Control Committees | Proprietary Member              
Disclosure of transactions between related parties [line items]              
Total   11,200            
Advisory or Control Committees | Independent Member              
Disclosure of transactions between related parties [line items]              
Total   11,200            
Advisory or Control Committees | Other external              
Disclosure of transactions between related parties [line items]              
Total   € 11,200