SAN FRANCISCO - Shareholders of First Security Corp. gave a tepid thumbs-up to a merger with Salt Lake City rival Zions Bancorp. on Wednesday, putting the fate of the strained merger in the hands of Zions' shareholders, who continue to show little appetite for the deal.

Indeed, in a sign of the mounting tensions between the companies, Zions, which owns a stake in First Security, planned to vote its shares against one of the proposals First Security put before shareholders, while carefully reiterating that the company continues to support the deal.

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