Traffic is building at banking companies' on-line brokerages, but executives say they have no plans to take on the likes of E-Trade and DLJdirect.

"I don't want to convert 100% of accounts to electronic trading, because we'd be shooting ourselves in the foot," said Larry Kreul, managing director of Comerica Securities Inc. in Detroit. "It's extremely difficult to make any money, because the margins are so thin.

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