SALT LAKE CITY Zion Bancorp. has agreed to buy National Bancorp of Arizona, a $414 million-assets, six-branch company based in Tucson.

The stock-swap deal. expected to close in March, was announced after four months of talks between the community bank and Zions, according to John J. Gisi, chairman and chief executive of National Bancorp, who will become a member of Zions' executive management committee. He said his company did not negotiate with any other party.

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