The majority of Coronado residents are not expats. Panamanians, from the city, have long been the residents of Coronado, the first beach community with the Coronado Resort, Golf and Beach Club, in existence for over 60 years. This gives Coronado an edge as the haven for the more prosperous of Panama, with a history and sense of privilege that goes with it.
Panamenos are connected to Americans by history and commerce and so enjoy the presence of Americans, who they think of as neighbors and friends. This is particularly so with the business and professional sector of Panama, who have often been educated in the States and have relatives living there. There is a bond also with Spanish and South American residents of Coronado, where speaking Spanish is a social asset. However, all these residents speak fluent English, and are happy to converse with Americans, who often do not speak Spanish.
Coronado, Panama is a mixed community, and, because of its easy access to the city and convenient amenities, two beaches, and the Coronado Resort and Equestrian center, is likely to stay that way. I do not think that most Americans coming here are looking for other Americans exclusively, but enjoy the 'mixture' as part of the Panama experience.