v3.26.1
Expense Example, No Redemption
May 01, 2026
USD ($)
RMB Fund | RMB Fund, Class C  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year $ 201
Expense Example, No Redemption, 3 Years 621
Expense Example, No Redemption, 5 Years 1,068
Expense Example, No Redemption, 10 Years 2,306
RMB Mendon Financial Services Fund | RMB Mendon Financial Services Fund, Class C  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 211
Expense Example, No Redemption, 3 Years 652
Expense Example, No Redemption, 5 Years 1,119
Expense Example, No Redemption, 10 Years $ 2,410