MB Financial's purchase of Chicago rival Taylor Capital (TAYC) could be delayed as regulators evaluate one of Taylor's former deposit relationships.

Regulators have notified the $5.7 billion-asset Taylor Capital that its Cole Taylor Bank may get cited for violating a section of the Federal Trade Commission Act that covers unfair or deceptive practices. Regulators are evaluating the potential infraction as part of approving the merger; ongoing evaluation could delay the deal beyond June 30, MB Financial said on Wednesday.

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