The death of Success Bancshares' flamboyant chief executive last week has cast doubt on the future of the Lincolnshire, Ill., company.

Observers said Saul D. Binder, who died of a heart attack July 12 at age 58, had supplied the personality and leadership behind $400 million-asset Success. And though few doubt the talent of his interim replacement- longtime colleague Christa N. Calabrese-the lack of a permanent successor has fueled speculation that the company may become a takeover target.

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