Robert Harvey, chairman of Maryland National Bank today said that the state's largest bank will continue its expansion program in the Washington suburbs.

Although Harvey was cautious about the bank's prospects in a presentation to the annual stockholder's meeting, he stressed in an interview after the meeting that Washington is very important to the bank's future growth.

Maryland National, which already has 24 of its 149 branches in Montgomery and Prince George's counties, opened two of those facilities in the District suburbs last year. Although Harvey would not be specific, he said he is very enthusiastic about the Washington area's economy.

"As in other capitols around the world, business is good in Washington," Harvey said. "We are planning on expanding more into that market."

Maryland National reported profits of $26 million for 1979, a 20 percent increase over 1978, and Harvey, despite noting "financial instability and sluggish growth" for the national economy, predicted "another year of solid earnings growth."

Harvey said it was premature to evaluate the impact on the bank from the Carter administration's credit policies. Maryland National has previously announced a tightening of its Master Charge credit card policies and Harvey would only say the bank is "considering a number of other things."

Harvey said that bank executives "are constantly anticipating a recession," but it seems always to move into the future. This year, however, the recession is almost inevitable.