| 1922 | A. v. Ehrfeld enters into a limited partnership with Bayerische Hypotheken- und Wechselbank called Kärntner Kredit- und Wechsel-Bankgesellschaft Ehrfeld & Co. Initially, the bank only has corporate and business banking customers. |
| 1928 | The company is transformed into a joint-stock corporation called Bank für Kärnten. |
| 1964 | The bank adds small personal loans to its range. |
| 1965 | The bank enters into an alliance with the Wüstenrot building and loan association. |
| 1970 | The first joint Drei-Banken (3 Banks) bond is issued together with Bank für Oberösterreich und Salzburg and Bank für Tirol und Vorarlberg. |
| 1983 | Expansion into Styria begins with the opening of a branch in Kaiserfeldgasse. The bank’s named is changed to Bank für Kärnten und Steiermark Aktiengesellschaft (BKS: Bank for Carinthia and Styria). |
| 1986 | Launch of the BKS ordinary share on the Vienna stock exchange. |
| 1988 | BKS enters the leasing market and sets up insurer Drei-Banken Versicherungs-AG together with Bank für Oberösterreich und Salzburg and Bank für Tirol und Vorarlberg. |
| 1990 | The first BKS branch in Vienna opens. |
| 1991 | BKS and its sister banks set up IT subsidiary Drei-Banken-EDV GmbH. |
| 1998 | The bank begins its international expansion, setting up a representative office in Zagreb and acquiring a leasing company based in Ljubljana now called BKS-leasing d.o.o. |
| 2000 | BKS and its sister banks make their first joint appearance as the 3 Banken Group. |
| 2002 | Formation of BKS-leasing Croatia d.o.o. based in Zagreb. |
| 2003 | BKS acquires a majority stake in Burgenländische Anlage & Kredit Bank AG (BAnK). |
| 2004 | The first banking branch in Slovenia opens. |
| 2005 | BAnK is merged into BKS Bank. Representative offices are set up in Italy and Hungary. The company is renamed as BKS Bank AG. |
| 2006 | BKS Bank enters the Croatian banking market when it acquires Kvarner banka d.d. |
| 2007 | A representative office is set up in Bratislava, and soon after, BKS acquires KOFIS Leasing in the Slovak Republic. It is assimilated into the BKS Bank Group and renamed as BKS-Leasing a.s. |
| 2008 | Kvarner Banka d.d. is renamed as BKS Bank d.d. and a branch is opened in Zagreb. |
| 2009 | BKS Bank defies the economic crisis. A six-for-one split of BKS Bank shares takes place in June, and 4.68 million new shares are successfully placed on the Vienna stock exchange during a raising of share capital in October. |
