These are busy times at Comerica Inc.

Not only did the bank complete its closely watched takeover of Sterling Bancshares Inc. of Houston on Thursday, but a day earlier it announced its third major executive change in less than two weeks.

Karen Parkhill, 45, was named chief financial officer and as a vice chairman. She will succeed CFO Beth Acton, 60, who plans to retire in April, the company said. Parkhill assumes oversight of corporate planning and development, corporate compliance and other administrative functions when she starts Aug. 8, and will take over as CFO once the company files its third-quarter report with the Securities and Exchange Commission.

Parkhill had been CFO of commercial banking for JPMorgan Chase & Co. since 2007. She joined J.P. Morgan in 1992. Acton has worked at Comerica since April 2002.

Last week, Comerica named Robert A. Dye its chief economist. Comerica also said Paul E. Burdiss had resigned as treasurer, to pursue a job at another regional bank. He was replaced by Michael H. Michalak on an interim basis.

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