Richard A. Didden, the chief executive and chairman of the board of the National Capital Bank of Washington, died Oct. 27 at his home in Arlington County. He was 65.

He had complications from hepatitis, said his son, R. Andrew Didden Jr.

Since he was a teenager, Mr. Didden had worked at National Capital Bank, the oldest continuously operating bank in Washington, which has its main office on Capitol Hill. For five generations, members of the Didden family have been the bank’s principal owners and managers. Richard Didden succeeded a brother, George A. Didden III, as chief executive in 2007.

Richard Andrew Didden was born in Washington. He graduated from St. John’s College High School in Washington in 1966 and from Loyola University Maryland in Baltimore in 1970. He joined the family-run bank in the bookkeeping department, his family said.

Mr. Didden also served on the board of the Capitol Hill Community Foundation and was a marathon runner and an enthusiast of crossword puzzles and poetry.

His marriage to Debby Simpson ended in divorce, and he was separated from his second wife, Charlene Rowell.

Survivors include his companion of 10 years, Jean Jackson of Arlington; a son from his first marriage, R. Andrew Didden Jr. of Bethesda, Md.; a daughter from his second marriage, Melissa D. Hennessy of Washington; a sister, Dorothee D. Riederer of Rockville, Md.; two brothers, James M. Didden of Potomac, Md., and Donald A. Didden of Chester, Md.; and three granddaughters.

— Bart Barnes