My bank (it's Westpac, one of the big ones in Australia) has some strange restrictions on passwords. They're maximum 6 characters in length and it must contain only characters A-Z and digits 0-9, and there's no case sensitivity.
I'm used to using much longer passwords or even passphrases for other online accounts, and it seems like the bank password strength is relatively weak. On the other hand, the password to my finance seems like one that should be much more important than other things such as forum logins, ebay account etc ...
So why does a major bank not let you choose a stronger password? Should I be concerned about their security?