Regions Financial Corp. (NYSE: RF) and AmSouth Bancorporation (NYSE: ASO) announced today that they have agreed to merge, forming one of the top 10 bank holding companies in the United States. The new company will have almost $140 billion in assets, hold nearly $100 billion in deposits and operate 2,000 branches in 16 states across the South, Midwest and Texas. Combined, the two companies employ 37,000 people. The Regions name will be retained.