The (DGZ) was established on 1918-02-01, initially as a banking division of the . Its capital of 15 million
Reichsmarks was provided by the regional under joint and several liability. DGZ operated cashless payment (giro) transactions and settlement between the regional giro organizations (). DGZ was also tasked with short-term lending to regional giro associations that were members of the , from 1924 the
Deutscher Sparkassen- und Giroverband (DSGV), and to other German municipal associations, managing interest-bearing funds, buying and selling foreign exchange, and borrowing on their behalf. In 1919, DGZ was also authorized to provide long-term financing to municipalities and to issue municipal bonds. The name "Deutsche Kommunalbank" was consequently added to that of DGZ in 1921, so that its full name became , still known as DGZ. In 1931, DGZ was reorganized together with the broader municipal banking system, and it received a statute () of its own in 1932. Even so, the DSGV remained ultimately liable for DGZ. At the same time, the supervision of DGZ was transferred from the
Interior Minister of Prussia to the national government of the
Weimar Republic. From 1933, the
National Socialists used DGZ to cover the steadily growing financial needs for rearmament and later for warfare. Following the end of
World War II, the DGZ head office, in
East Berlin, was closed by the
Soviet Military Administration. In 1949, it was revived as in
Düsseldorf,
West Germany, but with a more limited mandate that was focused on short-term transactions. In 1954, it was again named and resumed full activities, and in 1955 it opened a branch in
West Berlin. In 1964–1965, DGZ's head office was relocated from Düsseldorf to
Frankfurt. ==1999 merger and aftermath==