v3.26.1
Annual Total Returns
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
M International Equity Fund | M International Equity Fund                    
Prospectus [Line Items]                    
Annual Return [Percent] 32.44% 3.96% 16.00% (14.16%) 11.05% 8.90% 20.32% (20.57%) 24.05% (0.05%)
M Large Cap Growth Fund | M Large Cap Growth Fund                    
Prospectus [Line Items]                    
Annual Return [Percent] 19.61% 25.50% 32.04% (25.41%) 21.49% 28.89% 36.09% (4.95%) 38.97% (2.32%)
M Capital Appreciation Fund | M Capital Appreciation Fund                    
Prospectus [Line Items]                    
Annual Return [Percent] 18.06% 9.94% 23.56% (18.14%) 17.74% 17.73% 28.85% (14.15%) 19.02% 21.06%
M Large Cap Value Fund | M Large Cap Value Fund                    
Prospectus [Line Items]                    
Annual Return [Percent] 17.31% 18.63% 7.60% (1.45%) 30.01% (3.16%) 21.52% (12.07%) 14.99% 9.64%