Suffolk Bancorp, Riverhead, N.Y., said it named Edward J. Merz chairman, president and chief executive of the holding company, and chairman of its sole subsidiary, Suffolk County National Bank.

Effective Jan. 1, he will succeed Raymond A. Mazgulski, who remains a director. Mr. Mazgulski will become vice chairman of both entities.

Mr. Merz, who is currently president and chief executive of Suffolk County National, will be succeeded in those posts by John F. Hanley. Mr. Hanley is executive vice president and chief administrative officer as well as a director of the holding company.

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