The winnowing of Florida's most troubled banks continues, suggesting the worst of the state's bank failures is over. New quarterly rankings out Wednesday show a notable decrease in so-called "zero star" banks from rating firm Bauer Financial. Based on first-quarter data just analyzed by Bauer, only 30 Florida-based banks received a "zero star" or weakest financial ranking on Bauer's scale of 0 (weakest) to five (strongest). That compares to 39 zero star banks a quarter earlier based on year-end 2011 data. Of the recent 30 zero star banks, only one — Heritage Bank of Florida in Lutz — is in the immediate Tampa Bay area.