Piraeus of social problems also emerged with the concentration of new populations in the suburbs of the old city, such as Nikaia, Keratsini, Drapetsona and Korydallos. The involvement of Greece in World War II came as a major setback to the city's progress. After the war, the city began its development once more, as damage to the port and the city were repaired and new additions took shape after 1955. Piraeus is now the third largest municipality in Greece; the city proper with its suburbs form the Piraeus urban area, which is incorporated in the Athens urban area, thus making Piraeus
Piraeus Bank c.30k). As of March 2018, the Hellenic Financial Stability Fund holds 26% of outstanding common shares, while the remaining 74% is held by the private sector (legal entities and individuals). Piraeus Bank is a universal bank providing various banking services. Historically a bank supportive of SMEs it now also possesses particular know-how in the areas of agricultural banking, consumer and mortgage credit, green banking, capital markets, investment banking, leasing and electronic banking. Piraeus Bank and its subsidiaries form the Piraeus Bank Group. A group of shipowners in Piraeus founded "Banque du Pirée" (Piraeus Bank; BP) in 1916 to finance trade.