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Label Element Value
M Capital Appreciation Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading M CAPITAL APPRECIATION FUND
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fund Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The fees and expenses reflected in the table below do not include the fees and charges associated with variable annuities or variable life insurance plans. Fees and charges for life insurance and annuity products typically include a sales load and/or a surrender charge and other charges for insurance benefits. If those fees and charges were included, the costs shown below would be higher.

The following table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investments)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 38% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 38.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The example also assumes that your investment has a hypothetical 5% return each year and that the Fund's operating expenses remain the same. These expense examples do not reflect the fees and charges imposed by the applicable insurance company. If those fees and charges were included, the costs shown below would be higher. Although your actual costs (and returns) may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund principally invests in common stock of U.S. companies of all sizes, with emphasis on stocks of companies with capitalizations that are consistent with the capitalizations of those companies found in the Russell 2500® Index. As of March 31, 2022, the market capitalization range of companies in the Russell 2500® Index was between approximately $12 million and $43 billion. The Fund may invest up to 15% of the value of its total assets in equity securities of foreign issuers.

The Fund's sub-adviser, Frontier Capital Management Company, LLC ("Frontier") seeks long-term capital appreciation by employing a Growth-At-A-Reasonable-Price approach to identify, in its view, the best risk/reward investment ideas in the U.S. small- and mid-capitalization equity universe. Frontier purchases companies that, in its view, have above-average earnings growth potential and are available at reasonable valuations. Frontier's philosophy combines rigorous bottom-up fundamental analysis with a proven investment process.

Frontier may sell stocks for a number of reasons, including when price objectives are reached, fundamental conditions have changed so that future earnings progress is likely to be adversely affected, or a stock is fully invested and an attractive, new opportunity causes the sale of a current holding with less appreciation potential. Frontier does not sell stocks solely on changes to a company's market capitalization.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

As with any mutual fund, there is no guarantee that the Fund will achieve its goals. The Fund's share price will fluctuate which, means you could lose money on your investment in the Fund. The Fund's investment performance could be worse than other investments. The principal investment risks of the Fund include:

Small and Medium Capitalization Companies' Risk. The Fund may invest in small and medium capitalization companies, which tend to be more vulnerable to adverse developments than larger companies. These companies may have limited product lines, markets, or financial resources, or may depend on a limited management group. They may be recently organized, without proven records of success. Their securities may trade infrequently and in limited volumes. As a result, the prices of these securities may fluctuate more than prices of securities of larger, more widely traded companies and the Fund may experience difficulty in establishing or closing out positions in these securities at prevailing market prices. Also, there may be less publicly available information about small and medium capitalization companies or less market interest in their securities as compared to larger companies, and it may take longer for the prices of the securities to reflect the full value of their issuers' earnings potential or assets.

Foreign Securities and Currencies Risk. Foreign securities prices may decline or fluctuate because of: (a) economic or political actions of foreign governments, and/or (b) less regulated or liquid securities markets. Investors holding these securities may also be exposed to foreign currency risk (the possibility that foreign currency will fluctuate in value against the U.S. dollar or that a foreign government will convert, or be forced to convert, its currency to another currency, changing its value against the U.S. dollar). The Fund does not hedge foreign security risk or foreign currency risk.

Economic and Market Events Risk. Certain economic and market events in the U.S. and many foreign economies over the past years, including the European sovereign debt and banking crises, the decision of the United Kingdom to leave the European Union, the institution of tariffs or other trade barriers and rising U.S. interest rates, has resulted, and may continue to result, in an unusually high degree of volatility in the financial markets, both domestic and foreign, and in the net asset values of many mutual funds, including to some extent the Fund. More recently, Russia's large-scale invasion of Ukraine and sanctions brought by the U.S. and other countries against Russia have caused disruptions in many business sectors and have resulted in significant market disruptions, including increased volatility in certain commodity prices. In addition, rising tensions between China and Taiwan over a forced reunification have caused concerns in the region and globally. Financial markets have also been affected by governmental efforts to limit short selling and high frequency trading; measures to address U.S. federal and state budget deficits; S&P's downgrade of U.S. long-term sovereign debt; unpredictability of U.S. legislation on healthcare, tax reform and infrastructure; economic stimulus by the Japanese central bank; volatility in oil prices; social, political, and economic instability in Europe; persistently low or negative interest rates; securities overvaluation; dramatic changes in currency exchange rates; and China's economic slowdown. In addition, increased investment in passive investment vehicles may affect the value of the Fund's holdings. Conditions in the U.S. and many foreign economies have resulted, and may continue to result, in fixed income instruments experiencing unusual liquidity

issues, increased price volatility and, in some cases, credit downgrades and increased likelihood of default. These events have reduced the willingness and ability of some lenders to extend credit, and have made it more difficult for borrowers to obtain financing on attractive terms, if at all. In some cases, traditional market participants have been less willing to make a market in some types of debt instruments, which has affected the liquidity of those instruments. As a result, the values of many types of debt securities, including, but not limited to, mortgage-backed, asset-backed, and corporate debt securities, have declined. During times of market turmoil, investors may look to the safety of securities issued or backed by the U.S. Treasury, causing the prices of these securities to rise and their yields to decline. The reduced liquidity in fixed income and credit markets may negatively affect many issuers worldwide. In addition, global economies and financial markets are becoming increasingly interconnected, which increases the possibilities that conditions in one country or region might adversely impact issuers in a different country or region. The severity or duration of adverse economic conditions may also be affected by policy changes made by governments or quasi-governmental organizations.

Market Risk. Investments in common stocks are subject to stock market risk. Stock prices in general may decline over short or even extended periods, regardless of the success or failure of a particular company's operations. Stock markets tend to run in cycles, with periods when stock prices generally go up and periods when they generally go down. Common stock prices tend to go up and down more than those of bonds.

COVID-19 Pandemic Risk. The global outbreak of the novel coronavirus and related disease (COVID-19) continues to create significant economic and social uncertainty throughout the world and is causing significant related market volatility. In particular, travel restrictions, disruption of healthcare systems, quarantines and supply chain disruptions are having significant economic impacts. These impacts are on-going and may last for an extended period of time. The COVID-19 pandemic, other pandemics or epidemics, and local, regional or global natural or environmental disasters, wars, acts of terrorism, or similar events could have a significant adverse impact on the Fund and its investments and could result in increased volatility of the Fund's net asset value.

Growth Securities Risk. The Fund invests in growth securities, which may be more volatile than other types of investments, may perform differently than the market as a whole and may underperform when compared to securities with different investment parameters. Under certain market conditions, growth securities have performed better during the later stages of economic recovery. Therefore, growth securities may go in and out of favor over time.

Liquidity Risk. Liquidity risk exists when investments are difficult to sell as the result of low trading volume, lack of market makers, and/or legal restrictions. Illiquid securities may prevent the Fund from entering into security transactions at advantageous times or prices, potentially reducing the return of the Fund's portfolio. Investments in smaller market capitalizations and over-the-counter markets have greater exposure to liquidity risk.

Management Risk. The Fund is subject to management risk because it is actively managed. Management risk is the chance that security selection or focus on securities in a particular style, market sector or group of companies will cause the Fund to incur losses or underperform relative to its benchmarks or other investments with similar investment objectives. The sub-adviser will apply its investment techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that these will produce the desired results.

Operational Risk. Operational risks include human error, changes in personnel, system changes, faults in communication, and failures in systems, technology, or processes. Various operational events or circumstances are outside the sub-adviser's control, including instances at third parties. The Fund and the sub-adviser seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address these risks.

Cyber Security Risk. The Fund's and its service providers' use of internet, technology and information systems may expose the Fund to potential risks linked to cyber security breaches of those technological or information systems. Cyber security breaches, amongst other things, could allow an unauthorized party to gain access to

proprietary information, customer data, or fund assets, or cause the Fund and/or its service providers to suffer data corruption or lose operational functionality.
Risk Lose Money [Text] rr_RiskLoseMoney The Fund's share price will fluctuate which, means you could lose money on your investment in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following information may give some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each of the last ten calendar years and by showing how the Fund's average annual total returns compare with those of a broad measure of market performance (i.e., the Russell 2500 Index). The performance information shown here does not reflect fees that are paid by the insurance company separate accounts that invest in the Fund. Inclusion of those fees would reduce the total return figures for all periods. The Fund's past performance does not necessarily indicate how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information may give some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each of the last ten calendar years and by showing how the Fund's average annual total returns compare with those of a broad measure of market performance (i.e., the Russell 2500 Index).
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance does not necessarily indicate how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Highest quarterly return:  32.36% (for the quarter ended 06/30/2020)

Lowest quarterly return:  (35.85)% (for the quarter ended 03/31/2020)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest quarterly return:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 32.36%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest quarterly return:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (35.85%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2021)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

The table below shows the Fund's average annual total returns for the periods indicated and how those returns compare to those of the Russell 2500 Index. You cannot invest directly in an index. The Index is calculated on a total return basis and reflects no deduction for fees, expenses or taxes.
M Capital Appreciation Fund | Russell 2500 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell 2500 Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 18.18%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 13.75%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 14.15%
M Capital Appreciation Fund | M Capital Appreciation Fund  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.85%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.19%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.04%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 106
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 331
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 574
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,271
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 106
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 331
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 574
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,271
Annual Return 2012 rr_AnnualReturn2012 17.43%
Annual Return 2013 rr_AnnualReturn2013 39.20%
Annual Return 2014 rr_AnnualReturn2014 12.42%
Annual Return 2015 rr_AnnualReturn2015 (6.58%)
Annual Return 2016 rr_AnnualReturn2016 21.06%
Annual Return 2017 rr_AnnualReturn2017 19.02%
Annual Return 2018 rr_AnnualReturn2018 (14.15%)
Annual Return 2019 rr_AnnualReturn2019 28.85%
Annual Return 2020 rr_AnnualReturn2020 17.73%
Annual Return 2021 rr_AnnualReturn2021 17.74%
Label rr_AverageAnnualReturnLabel M Capital Appreciation Fund
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 17.74%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 12.78%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 14.26%