Analysis Of Income And Expense [Abstract]
| Concept | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||
| Material income and expense [abstract] | ||||||||||
| Interest expense | 
                                                171,062
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                121,058
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Interest income (expense) | 
                                                241,606
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                248,646
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Miscellaneous other operating income | 
                                                11,624
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                11,959
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Miscellaneous other operating expense | 
                                                12,056
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                20,255
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Fee and commission income (expense) [abstract] | ||||||||||
| Fee and commission income [abstract] | ||||||||||
| Fee and commission income | 
                                                77,777
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                72,111
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Fee and commission expense [abstract] | ||||||||||
| Fee and commission expense | 
                                                7,412
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                7,222
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Fee and commission income (expense) | 
                                                70,365
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                64,889
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract] | ||||||||||
| Share of profit (loss) of associates and joint ventures accounted for using equity method | 
                                                78,912
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                90,432
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax [abstract] | ||||||||||
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will not be reclassified to profit or loss, before tax | 
                                                2,439
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                4,198
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, before tax | 
                                                996,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
                                                431,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | — | — | — | 
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||
| Comprehensive income | 
                                                176,604
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                553,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                16,119
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                2,199
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                163,236
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                196,592
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                3,713
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                179,068
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                20,482
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                754,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             |