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Related parties - Additional information (Details)
€ in Thousands
12 Months Ended
Dec. 31, 2023
EUR (€)
eMPLOYEE
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Disclosure of key management personnel compensation [Line Items]      
Customer deposits € 650,276,000 € 640,799,000  
Interest paid € 33,734,000 14,193,000 € 8,705,000
Executive board      
Disclosure of key management personnel compensation [Line Items]      
Number of employees | eMPLOYEE 3    
Key management personnel      
Disclosure of key management personnel compensation [Line Items]      
Vesting of variable remuneration € 14,000 14,000  
Loans and advances outstanding 1,700 2,700  
Loan commitments 138 203  
Interest received 30 62  
Customer deposits 13,900 11,500  
Interest paid € 197 € 36