v3.26.1
Expense Example
May 01, 2026
USD ($)
RMB Fund | RMB Fund, Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 619
Expense Example, with Redemption, 3 Years 871
Expense Example, with Redemption, 5 Years 1,142
Expense Example, with Redemption, 10 Years 1,914
RMB Fund | RMB Fund, Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 301
Expense Example, with Redemption, 3 Years 621
Expense Example, with Redemption, 5 Years 1,068
Expense Example, with Redemption, 10 Years 2,306
RMB Fund | RMB Fund, Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 100
Expense Example, with Redemption, 3 Years 312
Expense Example, with Redemption, 5 Years 542
Expense Example, with Redemption, 10 Years 1,201
RMB Mendon Financial Services Fund | RMB Mendon Financial Services Fund, Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 629
Expense Example, with Redemption, 3 Years 900
Expense Example, with Redemption, 5 Years 1,192
Expense Example, with Redemption, 10 Years 2,021
RMB Mendon Financial Services Fund | RMB Mendon Financial Services Fund, Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 311
Expense Example, with Redemption, 3 Years 652
Expense Example, with Redemption, 5 Years 1,119
Expense Example, with Redemption, 10 Years 2,410
RMB Mendon Financial Services Fund | RMB Mendon Financial Services Fund, Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 110
Expense Example, with Redemption, 3 Years 343
Expense Example, with Redemption, 5 Years 595
Expense Example, with Redemption, 10 Years 1,317
RMB International Fund | RMB International Fund, Investor Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 125
Expense Example, with Redemption, 3 Years 390
Expense Example, with Redemption, 5 Years 676
Expense Example, with Redemption, 10 Years 1,489
RMB International Fund | RMB International Fund, Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 100
Expense Example, with Redemption, 3 Years 312
Expense Example, with Redemption, 5 Years 542
Expense Example, with Redemption, 10 Years 1,201
RMB SMID Cap Fund | RMB SMID Cap Fund Investor Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 107
Expense Example, with Redemption, 3 Years 396
Expense Example, with Redemption, 5 Years 706
Expense Example, with Redemption, 10 Years 1,587
RMB SMID Cap Fund | RMB SMID Cap Fund Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 82
Expense Example, with Redemption, 3 Years 318
Expense Example, with Redemption, 5 Years 573
Expense Example, with Redemption, 10 Years 1,303
RMB Quality Intermediate Core Fund | RMB Quality Intermediate Core Fund, Investor Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 62
Expense Example, with Redemption, 3 Years 228
RMB Quality Intermediate Core Fund | RMB Quality Intermediate Core Fund, Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 37
Expense Example, with Redemption, 3 Years 148
RMB Quality Intermediate Tax-Exempt Municipal Fund | RMB Quality Intermediate Tax-Exempt Municipal Fund, Investor Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 63
Expense Example, with Redemption, 3 Years 272
RMB Quality Intermediate Tax-Exempt Municipal Fund | RMB Quality Intermediate Tax-Exempt Municipal Fund, Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 38
Expense Example, with Redemption, 3 Years $ 193