Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of regional banker Comerica (NYSE: CMA) hit a personal mini-recession today, falling as much as 10.1% on very heavy trading.

So what: Last night's third-quarter report showed earnings of $0.51 per share, 66% above the year-ago period. According to FactSet, that was $0.02 per share short of analyst targets.

Now what: Most of the growth comes from the just-completed acquisition of Texas bank Sterling Bancshares, which was hailed as a slam-dunk deal almost a year ago. Regulatory reviews held up the closing, which added to Comerica's costs and delayed the expected returns. Well, with Sterling safely under its belt, Comerica now plays in roughly the same league as Regions Financial (NYSE: RF) and SunTrust (NYSE: STI). But sports a more generous dividend and thriftier P/E ratio than either of those peers. If you believe in Texas-sized banking, this looks like a good time to stake a claim in Comerica.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.