Corporate Information And Statement Of Ifrs Compliance [Abstract]
| Concept | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|
| Corporate information and statement of IFRS compliance [abstract] | ||
| Name of reporting entity or other means of identification | 
                                                BKS Bank AG
                                                
                                             | — | 
| Legal form of entity | 
                                                Aktiengesellschaft
                                                
                                             | — | 
| Country of incorporation | 
                                                Österreich
                                                
                                             | — | 
| Address of entity's registered office | 
                                                9020 Klagenfurt am Wörthersee, St. Veiter Ring 43
                                                
                                             | — | 
| Statement of IFRS compliance [text block] | 
                                                I. Allgemeine Angaben
                                                
                                             | — | 
| Disclosure of material accounting policy information [text block] | 
                                                II. Auswirkungen neuer und geänderter Standards
                                                
                                             | — | 
| Explanation of sources of estimation uncertainty with significant risk of causing material adjustment | 
                                                Auswirkung aktueller volkswirtschaftlicher Entwicklungen auf Bilanzierungs- und Bewertungsmethoden
                                                
                                             | — | 
| Disclosure of objectives, policies and processes for managing capital [text block] | 
                                                Kapitalmanagement
                                                
                                             | — | 
| Dividends recognised as distributions to owners per share | 
                                                40.00
                                                
                                             | 
                                                35.00
                                                
                                             | 
| Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners | 
                                                18.322.304,00
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | — | 
| Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share | 
                                                40.00
                                                
                                             | — |