The four pillars policy does not prevent the four major banks from acquiring smaller competitors. For example, in 2000, CBA acquired the Colonial group, which had emerged as a major bank–insurance combine in the 1990s, after the Colonial Mutual insurance group took over State Bank of NSW in 1994. The Commonwealth Bank also acquired the State Bank of Victoria in 1990 and BankWest in 2008. Westpac acquired the Challenge Bank in 1995, the Bank of Melbourne in 1997, and St.George Bank in 2008.