v3.26.3
Load [Member] Investment Objectives and Goals - Intermediate Government Bond Series
Jun. 30, 2026
Prospectus [Line Items]  
Risk/Return [Heading] Intermediate Government Bond Series
Objective [Heading] INVESTMENT OBJECTIVES
Objective, Primary [Text Block]
The Fund seeks to provide a high and stable level of income derived from bonds issued by the U.S. Government and its agencies without incurring undue risk to principal.