v3.26.3
Federated Hermes Pennsylvania Municipal Income Fund N-1A Cover
Aug. 31, 2026
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name Federated Hermes Municipal Securities Income Trust
Entity Central Index Key 0000866700
Entity Investment Company Type N-1A
Document Period End Date Aug. 31, 2026
Prospectus Date Oct. 31, 2026