A post-merger First Security Corp. will find it harder to achieve some cost savings as a result of new regulatory demands that could complicate future dealmaking between banks.

On a campaign to prevent merging banks from gaining monopolistic control over local markets, the Justice Department, which approved the Utah deal last week, set branch sale requirements that erased some of the efficiencies the banking companies had foreseen. The Federal Reserve approved the deal this week, paving the way for shareholder approval of the merger of Zions Bancorp and First Security, both of Salt Lake City, on Dec. 28 -- about a month later than expected.

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