Cullen/Frost Bankers will close four branches in the Rio Grande Valley this fall.

The company gained the branches after it bought the parent company of the $401 million-asset Alamo Bank of Texas in 2006.

The closures are the company's first in more than five years and will result in 27 layoffs, the San Antonio Business Journal reported in its online edition Tuesday. The branches are being closed for efficiency purposes, Raymond Jenkins, the regional president of Valley operations for unit Frost Bank, told the publication.

Following the closures, Cullen/Frost will have 111 branches in Texas. It has plans to open two more branches in the Dallas area next year.

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