If you are afraid of them taking your money, it is not likely that will happen.But if you have a credit to card through them that is listed in the bankruptcy, they may take their money from the account. Not sure about this.
If you have no other debts with them, they have no reason to lock your account. Some banks will lock your account automatically.
I would call the bank and ask them about their policy regarding accounts that file bankruptcy. That is probably the most straight forward thing to do.