There is always risk including when you leave money in your bank. Tell the guys on Cyprus if there was no risk on leaving your stuff in the bank.
Also, interest rates pay nothing. Unless you are already rich and inherited, I don't see how leaving all of your stuff on the bank is going to benefit you more than it does benefit the bank. While you make peanuts off interest, rich guys can live off bank interest only even if they are single figure %, only because they have so much that it creates a solid passive income.