After a bullish analyst note investors are wondering if they should take a deep breath and gobble up regional bank shares.

Specifically, they're wondering if Credit Suisse analyst Craig Siegenthaler is on to something. He said Wednesday he was optimistic that the loan losses experienced by regional banks would begin to shrink in 2010.

Losses on nearly all types of loans have hampered the sector's profitability since 2007 when the housing market started to collapse.