[U.S. Credit Crisis Worsens, Bank Stocks Lose Over $100 Billion in Market Value] Concerns over the U.S. credit crisis are intensifying as Zions Bank and Western Union Bank disclosed tens of millions of dollars in loan fraud losses, involving problematic commercial mortgage loans. The recent bankruptcy of subprime auto loan provider Tricolor Holdings and the collapse of First Brands Group have further fueled market panic. On Thursday, the market value of the 74 largest banks in the U.S. evaporated by over $100 billion, sparking Wall Street's doubts about laissez-faire capital policies.