Would suspect it will be very unlikely that bank's will take on many (if any) for work this summer. Bank's like all businesses in the current climate have to focus on their cost base, and my suspicion is that there will be very few if any opportunities.
Having said that make sure you approach your local bank branches with your CV, sometimes it's all about being in the right place at the right time, and you could be lucky. Are you Dublin based (or willing to go to Dublin) ? - staff turnover tends to be higher there, which may improve your chances.
Best Wishes,
BM