@Skol
You might find the KBW Banking index more (or equally) useful, symbol BKX. In fact, the company (KBW) produce the NASDAQ Bank Index that you've displayed. Here's a link to the company's home page:
http://www.kbw.com/equities/indices
KBW Bank Index - DAILY, 2nd image. There's also a related ETF , KBWB, with these as the top holdings: