Milwaukee-based Firstar Corp. said it fell victim to a check overdraft scheme that would result in a pretax charge of $22 million in the second quarter.

On an after-tax basis, the charge will total $13 million, Firstar said. It is expected to lower the banking company's second-quarter earnings by 20 cents per share. In the first quarter, Firstar earned $53.2 million, or 83 cents per share.

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