Investors should strive for diversification with their portfolios if they're focused on banks. Overinvested in Westpac shares? Here are 2 other ASX blue chips to buy You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources , and more. Learn More Plenty of Aussie investors may have a significant allocation to Westpac Banking Corp (ASX: WBC) shares or other ASX bank shares in their portfolios. If that's the case, I think it could be...