An idea for establishment of Poštová banka after 1989 was need for existence of financial institution of post office focused on rationalisation of structure, organisation, management and forms of financial services at post offices and formation of connecting segment with newly formatting banking system. It was a need to increase value of funds concentrated in provision of giro services, which predetermined banking nature of this financial institution. Need for building of Poštová banka as fast as possible and so that it is able to provide modern financial services led to necessity to use experience which could have been brought by foreign capital at the time. Therefore Poštová banka was constituted as a company with foreign capital participation. As of beginning of 1990 P.S.K. Vienna participated efficiently in preparation work with its advisory and consultancy support.
Poštová banka was registered as a joint stock company on 17th January 1991. Authorisation for execution of banking services was given by the State Bank of Czecho-Slovakia on 1st April 1991. In second half of 1992, preparation work for splitting of Poštová banka, a.s. Praha in two independent entities started. By decision of the General Meeting of shareholders of 15.12.1992, Poštová banka a.s., Praha terminated its activities as at 31.12.1992 and it was split in two successor organisations: Poštová banka, a.s., Praha and Poštová banka, a.s. Bratislava.
On 3rd June 2000 Poštová banka, a.s., Bratislava signed long-term contract of cooperation with Slovenská pošta, š. p. As of this time, Poštová banka and Slovenská pošta cooperate as strategic contracting partners in the field of sale of selected banking products and services at post offices within common marketing concept.