Ref. Keef.....
I would hope your PC is using HTTPS connection to the Bank, and that the security on that is sufficient that the bloke watching stuff going through his router can't decipher it anyway.
Oh how nice it is to be in a cloud of innocence....
SSL is indeed secure.... as long as you keep your wits about you.
Have a little think about how your average Phishing attack works.
Think about the extra options control over the local router gives you, especially against computers running DHCP to get their IP/DNS details. There is a lot of scope for very realistic looking attacks.
With encrypted communications, it's not necessarily about communications interception (although that of course is the jackpot) .... it's about finding ways to gain keys to the castle. Once you have the keys, you can go take a look around at your own leisure.