Most of those people have been hired from other investment firms, other mutual fund companies. The traditional corporate lending people continue to be downsized and terminated. It is generally not necessary to get an MBA in commercial banking although it wouldn't hurt you. Many of the execs at the very top do have MBAs from prestigious schools. This is possible, especially in smaller markets, but increasingly bankers are working longer hours as their jobs become more oriented towards general marketing of financial services.
Consumers are increasingly banking from home using online services and the Internet.
If you are Internet savvy and familiar with computers you will have an edge in banking. Banks are at the point now where they have to seriously start moving into an on-line environment, or risk losing some of their best customers, potentially forever. This is a common entry level job which requires that you evaluate business and consumer loan applications made to your bank. Your duties include projecting a company's future cash flow, evaluating its current financial soundness, visiting and interacting with financial people at businesses and dealing with lenders. You will learn a lot about business in this job.