v3.26.1
Shareholder Report, Line Graph (Details) - USD ($)
 3 Months Ended 5 Months Ended 6 Months Ended 11 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2020
Jun. 30, 2026
Jul. 31, 2017
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
C000015937                            
Account Value [Line Items]                            
Line Graph and Table Measure Name     Champlain Small Company Fund, Advisor Shares                      
Accumulated Value   $ 20,260 $ 24,026   $ 22,086 $ 23,378 $ 20,557 $ 18,033 $ 22,775 $ 15,880 $ 15,674 $ 15,472 $ 12,900 $ 10,668
C000173316                            
Account Value [Line Items]                            
Line Graph and Table Measure Name     Champlain Small Company Fund, Institutional Shares                      
Accumulated Value   1,855,192 $ 2,230,870 $ 1,171,674 2,048,280 2,162,513 1,896,849 1,659,882 2,091,170 1,452,618 1,430,398 1,408,712    
C000065363                            
Account Value [Line Items]                            
Line Graph and Table Measure Name     Champlain Mid Cap Fund, Advisor Shares                      
Accumulated Value   22,981 $ 26,750   26,085 25,721 24,275 21,044 28,635 19,126 17,175 15,046 12,646 10,822
C000096284                            
Account Value [Line Items]                            
Line Graph and Table Measure Name     Champlain Mid Cap Fund, Institutional Shares                      
Accumulated Value   2,328,441 $ 2,748,361   2,677,327 2,632,583 2,479,011 2,143,412 2,908,135 1,936,283 1,733,462 1,514,856 1,270,810 1,084,548
C000245657                            
Account Value [Line Items]                            
Line Graph and Table Measure Name     Champlain Strategic Focus Fund, Institutional Shares                      
Accumulated Value $ 1,135,000   $ 1,288,784   1,252,867 1,184,887                
Russell 3000 Index (USD) (TR)                            
Account Value [Line Items]                            
Line Graph and Table Measure Name [1]     Russell 3000 Index (USD) (TR)                      
Accumulated Value   19,869 $ 40,853   36,850 31,457 25,408 20,172 24,967 16,765 15,113 14,118 12,130 10,444
Russell 3000 Index (USD) (TR)                            
Account Value [Line Items]                            
Line Graph and Table Measure Name [2]     Russell 3000 Index (USD) (TR)                      
Accumulated Value   1,897,477 $ 3,901,527 1,158,395 3,519,220 3,004,147 2,426,460 1,926,422 2,384,390 1,601,091 1,443,339 1,348,286    
Russell 3000 Index (USD) (TR)                            
Account Value [Line Items]                            
Line Graph and Table Measure Name [3]     Russell 3000 Index (USD) (TR)                      
Accumulated Value   19,869 $ 40,853   36,850 31,457 25,408 20,172 24,967 16,765 15,113 14,118 12,130 10,444
Russell 3000 Index (USD) (TR)                            
Account Value [Line Items]                            
Line Graph and Table Measure Name [4]     Russell 3000 Index (USD) (TR)                      
Accumulated Value   1,986,872 $ 4,085,338   3,685,021 3,145,680 2,540,777 2,017,181 2,496,725 1,676,523 1,511,339 1,411,807 1,212,970 1,044,449
Russell 3000 Index (USD) (TR)                            
Account Value [Line Items]                            
Line Graph and Table Measure Name [5]     Russell 3000 Index (USD) (TR)                      
Accumulated Value 1,102,449   $ 1,772,637   1,598,938 1,364,917                
Russell 2000 Index (USD) (TR)                            
Account Value [Line Items]                            
Line Graph and Table Measure Name [1]     Russell 2000 Index (USD) (TR)                      
Accumulated Value   17,205 $ 28,342   23,123 20,498 18,378 15,717 19,754 12,826 13,443 14,064 11,845 10,000
Russell 2000 Index (USD) (TR)                            
Account Value [Line Items]                            
Line Graph and Table Measure Name [2]     Russell 2000 Index (USD) (TR)                      
Accumulated Value   1,690,549 $ 2,784,935 $ 1,163,955 2,272,142 2,014,187 1,805,833 1,544,385 1,941,071 1,260,302 1,320,932 1,381,997    
Russell Midcap Index (USD) (TR)                            
Account Value [Line Items]                            
Line Graph and Table Measure Name [3]     Russell Midcap Index (USD) (TR)                      
Accumulated Value   17,740 $ 31,003   26,890 24,313 21,079 17,981 21,746 14,575 14,283 13,386 11,798 10,437
Russell Midcap Index (USD) (TR)                            
Account Value [Line Items]                            
Line Graph and Table Measure Name [4]     Russell Midcap Index (USD) (TR)                      
Accumulated Value   $ 1,774,001 $ 3,100,320   2,688,950 2,431,287 $ 2,107,863 $ 1,798,100 $ 2,174,643 $ 1,457,520 $ 1,428,332 $ 1,338,563 $ 1,179,830 $ 1,043,746
Russell Midcap Growth Benchmark Index (USD) (TR)                            
Account Value [Line Items]                            
Line Graph and Table Measure Name [5],[6]     Russell Midcap Growth Benchmark Index (USD) (TR)                      
Accumulated Value $ 1,136,729   $ 1,617,852   $ 1,508,139 $ 1,387,981                
[1] Total Return (TR) - Reflects no deductions for fees, expenses or taxes.
[2] Total Return (TR) - Reflects no deductions for fees, expenses or taxes.
[3] Total Return (TR) - Reflects no deductions for fees, expenses or taxes.
[4] Total Return (TR) - Reflects no deductions for fees, expenses or taxes.
[5] Total Return (TR) - Reflects no deductions for fees, expenses or taxes.
[6] As of March 2025, the benchmark name changed from Russell Midcap Growth Index to Russell Midcap Growth Benchmark Index, to reflect that it follows an uncapped methodology. Specifically, the Russell Midcap Growth Benchmark Index reflects the full market-cap weightings and does not apply the capping constraints introduced in 2025.