Zions Bancorp and First Security Corp. face more than the usual hurdles as the two Salt Lake City banking companies try to merge.

An antitrust suit filed last year claims that if combined, the market share of the two large banks - both of which have longstanding ties to the Church of Jesus Christ of Latter-day Saints and, therefore an inside track with the extensive Mormon customer base - would be too great to maintain a competitive banking environment in Utah.

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