Leonard H. Hoyle, 78, an area banker for 40-years and a former vice President of Suburban Trust Co. of Maryland, died of emphysema Friday at the Collingswood Nursing Center in Rockville.

Mr. Hoyle began with Riggs National Bank in Washington in 1926. He joined the old First National Bank of Gaithersburg in 1934 and became its president in 1949. The Gaithersburg bank then became the Maryland State Bank of Montgomery County in 1958, as a result of a merger, and Mr. Hoyle continued as president of the merged bank.

Mr. Hoyle became vice president of Suburban Trust in 1960, after that bank had merged with the Maryland State Bank. He remained as vice president for upper Montgomery COunty banking services until retiring in 1965.

In addition to his banking duties, he served as a financial adviser to the Montgomery County Council during the 1950s and 1960s, and was a member of the educational advisory committee of the Montgomery County Department of Education.

Mr. Hoyle was born near Olney. He was a graduate of the Maryland Institute of Art in Baltimore, Stewart Business College and the American Institute of Banking in Washington.

He served in the Army during World War I.

Mr. Hoyle was a Mason, and a founding member and president of both the Rockville and Gaithersburg Lions clubs, and president of Gaithersburg PTA.

He was president of the Montgomery County Bankers Association for a time during the late 1950s

Mr. Hoyle was a member and trustee of Grace United Methodist Church in Gaithersburg.

He is survived by his wife, Geneve B., of the home in Gaithersburg; a daughter, Judith Wigle, of Wheaton; a son, Leonard H. Jr., of Silver Spring; a brother, Bill Hoyle, of Arlington, and three grandchildren.