Lake Michigan Credit Union LMCU is the largest credit union in Michigan, with 35+ branches and 330,000+ members. Comprehensive financial services – from high-interest checking accounts to mortgages, commercial loans, insurance and investment services. Leave a Reply Cancel replyCommentEnter your name or username to comment Enter your email address to comment Enter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.