Wells Fargo & Co. and First Interstate Bancorp made it official Wednesday, saying their landmark $11.6 billion deal to merge would wring out $800 million in expenses and $100 million in revenues from the combined entity.

But the companies skirted the issue of whether a deal between the second- and third-largest banks in California would be a "devastating blow" for the state, as First Interstate Chairman William E.B. Siart predicted earlier this month.

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