v3.25.2
Shareholder Report, Line Graph (Details) - USD ($)
 6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Oct. 16, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Aug. 31, 2016
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2014
C000015937                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Champlain Small Company Fund, Advisor Shares                            
Account Value $ 26,281 $ 26,426 $ 23,238   $ 20,384 $ 25,745 $ 22,901 $ 17,951 $ 17,718 $ 17,489 $ 14,582   $ 12,059 $ 11,304 $ 10,000
C000173316                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Champlain Small Company Fund, Institutional Shares                            
Account Value $ 2,152,893 2,162,513 1,896,849   1,659,882 2,091,170 1,855,192 1,452,618 1,430,398 1,408,712 1,171,674 $ 1,000,000      
C000065363                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Champlain Mid Cap Fund, Advisor Shares                            
Account Value $ 29,145 28,460 26,860   23,285 31,685 25,428 21,163 19,004 16,649 13,993   11,974 11,065 10,000
C000096284                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Champlain Mid Cap Fund, Institutional Shares                            
Account Value $ 2,994,463 2,919,907 2,749,574   2,377,346 3,225,533 2,582,570 2,147,612 1,922,655 1,680,190 1,409,508   1,202,917 1,109,141 1,000,000
C000245657                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Champlain Strategic Focus Fund, Institutional Shares                            
Account Value $ 1,255,813 1,184,887 1,135,000 $ 1,000,000                      
Russell 3000 Index (USD)                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Russell 3000 Index (USD)                            
Account Value $ 37,019 35,006 28,275   22,448 27,784 22,111 18,657 16,819 15,711 13,498   11,623 11,128 10,000
Russell 3000 Index (USD)                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Russell 3000 Index (USD)                            
Account Value $ 3,176,894 3,004,147 2,426,460   1,926,422 2,384,390 1,897,477 1,601,091 1,443,339 1,348,286 1,158,395 1,000,000      
Russell 3000 Index (USD)                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Russell 3000 Index (USD)                            
Account Value $ 37,019 35,006 28,275   22,448 27,784 22,111 18,657 16,819 15,711 13,498   11,623 11,128 10,000
Russell 3000 Index (USD)                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Russell 3000 Index (USD)                            
Account Value $ 3,701,925 3,500,629 2,827,471   2,244,794 2,778,448 2,211,065 1,865,697 1,681,874 1,571,111 1,349,838   1,162,301 1,112,837 1,000,000
Russell 3000 Index (USD)                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Russell 3000 Index (USD)                            
Account Value $ 1,443,404 1,364,917 1,102,449 1,000,000                      
Russell 2000 Index (USD)                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Russell 2000 Index (USD)                            
Account Value $ 22,554 22,964 20,588   17,608 22,130 19,274 14,369 15,060 15,756 13,270   11,203 11,203 10,000
Russell 2000 Index (USD)                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Russell 2000 Index (USD)                            
Account Value $ 1,978,234 2,014,187 1,805,833   1,544,385 1,941,071 1,690,549 1,260,302 1,320,932 1,381,997 1,163,955 $ 1,000,000      
Russell Midcap Index (USD)                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Russell Midcap Index (USD)                            
Account Value $ 28,215 26,913 23,333   19,904 24,072 19,637 16,134 15,811 14,817 13,060   11,554 11,070 10,000
Russell Midcap Index (USD)                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Russell Midcap Index (USD)                            
Account Value $ 2,821,500 2,691,315 2,333,300   $ 1,990,409 $ 2,407,222 $ 1,963,732 $ 1,613,403 $ 1,581,093 $ 1,481,723 $ 1,306,014   $ 1,155,375 $ 1,106,951 $ 1,000,000
Russell Midcap Growth Benchmark Index (TR) (USD)                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Russell Midcap Growth Benchmark Index (TR) (USD)                            
Account Value $ 1,523,804 $ 1,387,981 $ 1,136,729 $ 1,000,000