Source: http://searchfinancialsecurity.techtarget.com/news/article/0,289142,sid185_gci1347604,00.html
The news article referenced quotes a survey by Deloitte of 250 CISOs in the financial services industry. It states that 36% of respondents believe that their greatest threat comes from insiders. If you couple this with the information from the Verizon Report I referenced yesterday that suggests that less than 10% of companies detect the breach through active monitoring and a massive three quarters only came to light when it was reported to the organisation by a third-party.
All of this suggests that, although internal monitoring may be implemented, it is either implemented incorrectly or sufficient resources are not deployed to review it effectively.
Financial institutions tend to be among the more security conscious organisations and therefore should have a greater understanding of the risks to their organisation; it remains to be seen if the cost to benefit analysis demonstrates that there is value in deploying the resources to reduce the risks from insiders.