The company's second-quarter net interest margin -- the difference between the average yield on loans and investments and the average cost for deposits and borrowings -- expanded to 3.16%, from 3.09% the previous quarter, and 3.07% a year earlier. The margin expansion ran counter to the trend for most large regional U.S. banks, which have been seeing their margins squeezed as the Federal Reserve has continued making large purchases of long-term securities, in an attempt to bring long-term rates down even further, from historically low levels.

Regions felt the margin squeeze earlier than many other banks, and Guggenheim Analyst Marty Mosby says that the company "has the opportunity to continue to expand the margin as they refinance some of their debt and CDs mature at lower rates, and as they see their ratings from the ratings agencies improve."

Mosby estimates that Regions Financial's margin will expand by another nine basis points through the end of 2013.

The analyst rates Regions a "Buy," and on Monday raised his price target for the shares to $9.25 from $9.00, saying he expected the company to improve its "quarterly earnings run rate to above $0.20 before year-end, pushing potential upside substantially higher."

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Interested in more on Regions Financial? See TheStreet Ratings' report card for this stock.

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-- Written by Philip van Doorn in Jupiter, Fla.

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Philip W. van Doorn is a member of TheStreet's banking and finance team, commenting on industry and regulatory trends. He previously served as the senior analyst for TheStreet.com Ratings, responsible for assigning financial strength ratings to banks and savings and loan institutions. Mr. van Doorn previously served as a loan operations officer at Riverside National Bank in Fort Pierce, Fla., 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.

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