Mercantile Bancorp., which announced it would buy a sizable thrift in its hometown of St. Louis, was the only major bank to stir the calm of holiday trading last week.

Since announcing Tuesday that it was purchasing $9 billion-asset Roosevelt Financial Group, $18.2 billion-asset Mercantile saw its shares gain just 63 cents to $50.125 as of Friday's close. Over the week, Roosevelt's shares rose just 0.14%, to $20.625.

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