The Idaho State Historical Society (ISHS) is a historical society located in the U.S. state of Idaho that preserves and promotes Idaho’s cultural heritage. The society's vision is to inspire, enrich, and reach out to all Idahoans by providing leadership in the areas of preservation and dissemination of the state's dynamic cultural heritage.

The society was founded as the Historical Society of Idaho Pioneers in 1881, nine years before statehood in 1890, and was established as a state agency in 1907. Employing over 50 staff and over 100 volunteers; it includes the Idaho State Historical Museum, the official state museum; the Idaho State Archives, which provides public access to state archives, for which it is responsible, in addition to a variety of other reference material; the State Historic Preservation Office, which maintains records of historic places and archaeological sites in the state; and the Historic Sites Program, which oversees a number of historic sites including the Old Idaho State Penitentiary.

More information on the Wikipedia page [1]

The websits is [2].