Banc One Corp. said Friday that it had agreed to acquire Key Centurion Bancshares, the largest banking company in West Virginia, for about $536 million in stock.

The deal would make West Virginia the eighth state in Banc One's expanding empire. Including Key Centurion's $3 billion in assets, Ohio-based Banc One would have $74.7 billion in assets when pending acquisitions are completed, ranking seventh in the nation.

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