I am working on the effects of bank related fraud on the net worth of banks in different country with a few to compare the seriousness of regulators in combating the scourge.
Depends. Fraud towards banks or fraud by banks? Both should be covered in database containing OpRisk. Fraud towards banks should be a lot easier to get, but fraud by banks is also obtainable by analysing the the legal penalty fees. I would first try OpRisk database such as ORX, but also by analysing the news about banks' legal penalty fees.