financial ostrich
n.— «The survey highlights another breed of personal banker, the “financial ostrich,” a term used to describe a small proportion of U.S. consumers (3 percent) who are completely ignorant about how much money is in their bank account at any given time.» —“Research Reveals U.S. Consumer Obsession With Bank Balances” in Dublin, California CNNMoney Sept. 11, 2007. (source: Double-Tongued Dictionary)