Disclosure Of Financial Instruments [Text Block]
| Concept | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|
| Disclosure of financial instruments [text block] | — | — | 
| Income, expense, gains or losses of financial instruments [abstract] | ||
| Gains (losses) on financial instruments [abstract] | ||
| Gains (losses) on financial assets at fair value through profit or loss, mandatorily measured at fair value | 
                                                494,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                4,289
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Other comprehensive income, before tax, gains (losses) from investments in equity instruments | 
                                                15,215
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                19,889
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Other comprehensive income, before tax, financial assets measured at fair value through other comprehensive income | — | — | 
| Gains (losses) on financial assets measured at fair value through other comprehensive income, before tax | 
                                                718,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                2,016
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Reclassification adjustments on financial assets measured at fair value through other comprehensive income, before tax | 
                                                4,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Gain (loss) arising from derecognition of financial assets measured at amortised cost [abstract] | ||
| Gain (loss) arising from derecognition of financial assets measured at amortised cost | 
                                                233,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                917,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Disclosure of credit risk [text block] | 
                                                Risikovorsorge zu Forderungen an Kreditinstitute bewertet zu fortgeführten Anschaffungskosten
                                                
                                             | — |