Charles M. Byrley and Herbert L. Davidson have joined Legg Mason Wood Walker Inc. as investment brokers at the firm's McLean office.

Charles Effinger Smoot, vice president, trust, for United Virginia Bank, has been elected president of the Washington, D.C, Estate Planning Council. He is the first officer of a suburban bank to head the 200-member council.

Charles C. Hogg II has been elected executive vice president of the Maryland Savings-Share Insurance Corp. Hogg is a vice president and senior loan officer in the Baltimore regional office of the First National Bank of Chicago.

Harold L. Hall, president of Southern Railway System, has been elected to the board of directors of the Riggs National Bank of Washington. He replaced John W. Thompson Jr., retired vice president of Washington Star Communications, who was named to the bank's advisory board.

Harold V. Dellinger II and Stanley E. Ellison have been named vice presidents of First Virginia Bank.

James R. Beers, managing partner of Beers and Cutler, Certified Public Accountants, and Stuart E. Karu, president and chief executive officer of Henry J. Kaufman & Associates, have been elected to the board of directors of the District of Columbia National Bank.

Walter R. Fatzinger has been named senior vice president and trust officer at American Security Bank. He will serve as general manager of the trust and investment division.