According to ProblemBankList.com (there really is a website for everything) details what a problem bank is:
The Problem Bank List is the FDIC’s internal list of financial institutions that the FDIC believes are in danger of failure.Calculated Risk reader surferdude808 with the details:
The Unofficial Problem Bank List crossed a major threshold this week as 500 institutions are now listed.And the chart...
The list grew by a net 18 institutions this week and nearly $44 billion in assets were added. Most of the increase comes is a result of the FDIC finally releasing its actions for September 2009. It will take another month to get their actions for October 2009.
Source: Calculated Risk