IDLEWILDE, TEXAS. Idlewilde was on the Medina River off U.S. Highway 90, twenty miles west of downtown San Antonio in western Bexar County. It was named for a town in New York by Thomas Donkin (or Dunkin), who arrived from New York in 1879. During that year Donkin interested community residents in building a school, and he became its first teacher. The one-teacher elementary school became known as Delta School. A post office operated at the community from 1887 to 1902 and briefly in 1908. In the 1930s Idlewilde had a flag station, a school, and a few houses, but by the 1950s the settlement was no longer shown on maps.