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Label Element Value
M Large Cap Value Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading M LARGE CAP VALUE 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 61% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 61.00%
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 normally invests at least 80% of its net assets, plus the amount of borrowings for investment purposes, if any, in issuers domiciled, or having their principal activities, in the United States, at the time of investment or other instruments with similar economic characteristics. In addition, the Fund normally invests at least 80% of its net assets in equity securities of large capitalization companies. Brandywine Global Investment Management, LLC ("Brandywine"), the Fund's sub-adviser, defines "large capitalization" companies as those companies with market

capitalizations similar to companies in the Russell 1000® Index (the "Index"). As of March 31, 2022, the market capitalization range of companies in the Russell 1000® Index was between approximately $135 million and $2.8 trillion. This strategy is not fundamental (it may be changed without shareholder approval), but should the Fund decide to change this strategy, it will provide shareholders with at least 60 days' notice.

The Fund invests primarily in equity securities that, in Brandywine's opinion, are undervalued or out of favor. Brandywine invests in securities that meet its value criteria, primarily price-to-earnings, price-to-book, price momentum and share change and quality, based on both quantitative and fundamental analysis. The Fund expects to hold approximately 175-250 stocks under normal market conditions.

Brandywine bases portfolio price targets on quantitative criteria determined in its sell process. Brandywine's systems update these quantitatively determined buy and sell limits on a daily basis. Buy candidates must have a price that qualifies the stock as a value such that the price-to-earnings ratio is in the lower 40% of its universe or the price-to-book is in the lower 25% of its universe at time of purchase. Additionally, the current price compared to the price nine months ago must place it above the lower quartile of other universe stocks when ranked by nine-month price momentum and the change in shares outstanding over the past year must place it below the upper quartile.

Sell candidates will have a price that when compared to earnings and book place the stock above the median on a price-to-earnings basis and above the 40th percentile on a price-to-book basis. If a stock's price declines relative to the universe such that it falls to the lower 10% of stocks as ranked on nine-month price momentum or the company issues sufficient shares to rank among the top 10% largest issuers (as a percentage of shares outstanding) in the year, the holding will be a sell candidate. Additionally, a stock will be sold if the capitalization falls 20% below the minimum purchase capitalization criteria.

Brandywine may modify buy and sell trigger points and decisions only due to tracking error considerations, trading opportunities or limitations such as position, industry or sector size. Brandywine does not violate its buy and sell rules based on analyst affinity for the stock. Its investment process requires disciplined buy and sell decisions rules with carefully outlined exceptions.

If a security experiences a severe fundamental deterioration event that is not captured in the price change, share change or valuation rules, Brandywine will initiate a sell. The rank order of the most common occurrences are price momentum, valuation expansion into the sell range, share issuance or fundamental deterioration.
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:

Large-Capitalization Investing Risk. Large-capitalization stocks as a group could fall out of favor with the market, causing the Fund to underperform investments that focus on small- or medium-capitalization stocks. Larger, more established companies may be slow to respond to challenges and may grow more slowly than smaller companies.

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.

Value Investment Risk. Value stocks may perform differently from the market as a whole and an investment strategy purchasing these securities may cause the Fund to at times underperform equity funds that use other investment strategies. Value stocks can react differently to political, economic, and industry developments than the market as a whole and other types of stocks. Value stocks also may underperform the market for long periods of time.

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.

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.

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.

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.
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 since 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., Russell 1000 Value Index). The performance prior to May 1, 2013 and December 31, 2019 reflects the performance results obtained under two different successive sub-advisers that used different investment strategies. Had the current sub-adviser and investment strategies been in place during that period, the performance results may have been different. 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 since 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., Russell 1000 Value 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:  15.14% (for the quarter ended 03/31/2021)

Lowest quarterly return:  (28.75)% (for the quarter ended 03/31/2020)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest quarterly return:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2021
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.14%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest quarterly return:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (28.75%)
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 1000 Value 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 Large Cap Value Fund | Russell 1000 Value Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell 1000 Value Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 25.16%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 11.16%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 12.97%
M Large Cap Value Fund | M Large Cap Value Fund  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.43%
Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.22%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 362
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 810
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 66
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 208
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 362
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 810
Annual Return 2012 rr_AnnualReturn2012 17.29%
Annual Return 2013 rr_AnnualReturn2013 34.22%
Annual Return 2014 rr_AnnualReturn2014 9.68%
Annual Return 2015 rr_AnnualReturn2015 (0.66%)
Annual Return 2016 rr_AnnualReturn2016 9.64%
Annual Return 2017 rr_AnnualReturn2017 14.99%
Annual Return 2018 rr_AnnualReturn2018 (12.07%)
Annual Return 2019 rr_AnnualReturn2019 21.52%
Annual Return 2020 rr_AnnualReturn2020 (3.16%)
Annual Return 2021 rr_AnnualReturn2021 30.01%
Label rr_AverageAnnualReturnLabel M Large Cap Value Fund
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 30.01%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 9.12%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 11.27%