Fourth Financial Corp. chairman Darrell G. Knudson has become the Energizer bunny of banking: He keeps acquiring and acquiring and acquiring.

Head of what has long been the dominant bank in Kansas, Mr. Knudson has doubled the size of Fourth Financial to nearly $8 billion since he arrived in 1990. He plans to add up to $2 billion a year in assets. Not surprisingly, the company is consistently one of the top five acquirers.

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