Macs are resistant to viruses and malware, but they are not immune to scam emails from people who don't even know what bank you use, but are hoping you are as dumb as they are and will click the link that takes you to their looks-like-the-bank fake website where you will give them sensitive financial information.
This has nothing to do with malware or viruses, it's just jerks trying to trick you using email. As mentioned above, NEVER click on a link in an email that claims you need to log in to provide certain kinds of information. Copy the link and check it out in a browser if you're really unsure, but 99 times out of 100 this will be a scam.