Credit Union Australia plans to double its assets under management to about $16 billion in "three to five years", The Australian reported.Group general manager of strategy and marketing Andrew Hadley told the newspaper that CUA had about $8 billion in assets under management, and "we would expect that over the course of the next three to five years we will double that."That would be achieved through a combination of organic growth and acquisitions of other credit unions and building societies.Hadley said CUA would be lifting its advertising budget by about 50 per cent this year.