Some Alliance Bancorp investors say the Hinsdale, Ill., company may have agreed to pay too much in its latest buyout deal.

Alliance announced in December that it would acquire Hometown, Ill.- based Southwest Bancorp in a deal worth $94 million, or two times book value. The deal, expected to close in the third quarter, would boost Alliance's assets from $1.5 billion to about $2 billion and make it the third-largest thrift in greater Chicago.

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