The findings on this forum are AV products for mac cause problems from inoperability to outright system crashes, but no real benefits to security.
There are no OS X virus found in the wild at this time to be discovered by any credible securities lab in the world who's job it is to find these threats. You bank rep and their collective securities department are uninformed of the consequences of suggesting mac users follow their ill advised suggestions.
Keep OS X and iOS patched from Apple, this is the single best software solution to on line security for Apple products.