Do a Google search for [commerce bank]. The first result (at least for me) has the link title "Commerce Bank Online." Below that is a link to "Show stock quote for CBH." If you click the link or the plus sign to expand it, nothing appears except another link for "More information about CBH." If you click this, you are taken to a Google Finance page that says, "Your search – NYSE:CBH – produced no matches."

It seems that Google is slow to update ticker symbol data on the Web search side. Commerce was acquired by TD Bank more than a year ago, and CBH was delisted in March.