Banks don't close a customer account like that , where have you see this ? "Suspicious" is not enough to decide to close the account of anyone LOL....
There are banking laws and customers rights. It's not the cow boy period where banks talk and you just shut up and obey
to be honest they can close accounts pretty easily and I'm sure that there were several occasions in other countries where banks decided to close people accounts just because they traded bitcoins or something. That's why I don't trust banks at all and try to use their services as less as possible. In the end governments will be trying to ban bitcoins for sure and we will need to do everything to conquer them.