Updated with statement from Harris Bank spokesperson, latest Bank of Montreal share price.

CHICAGO ( TheStreet) -- The web site of Chicago-based Harris Bank was down for maintenance at midday on Monday, causing a spike in Internet search activity pertaining to the institution.

Visitors to the Harris Bank homepage are getting a message saying the main site is down for maintenance but that Harris Online Services are still available. Harris is a subsidiary of Bank of Montreal ( BMO).

The outage may be especially disconcerting for former customers of Amcore Bank, which was recently acquired by Harris after it failed on April 24 along with six other banks in the Chicago area.

A Bank of Montreal spokesperson was unable to comment immediately about the status of Harris Bank's online banking operations. A spokesperson from Harris Bank provided this statement: "Yes we are having some issues with the Harris Bank website, but there is no impact to the Amcore websites or to our Amcore customers."

Bank of Montreal shares were up 1.2% to $62.75 in afternoon trades.

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-- Written by Philip van Doorn in Jupiter Fla.
Philip W. van Doorn joined TheStreet.com Ratings., Inc., in February 2007. He is the senior analyst responsible for assigning financial strength ratings to banks and savings and loan institutions. He also comments on industry and regulatory trends. Mr. van Doorn has fifteen years experience, having served as a loan operations officer at Riverside National Bank in Fort Pierce, Florida, and as a credit analyst at the Federal Home Loan Bank of New York, where he monitored banks in New York, New Jersey and Puerto Rico. Mr. van Doorn has additional experience in the mutual fund and computer software industries. He holds a Bachelor of Science in business administration from Long Island University.