v3.26.1
Form N-1A Cover
May 01, 2026
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name RMB INVESTORS TRUST
Entity Central Index Key 0000030126
Entity Investment Company Type N-1A
Document Period End Date Apr. 28, 2026
Prospectus Date May 01, 2026