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SIT MUTUAL FUNDS INC | Sit Balanced Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY INFORMATION SIT BALANCED FUND
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Sit Balanced Fund (the “Fund”) seeks long-term capital growth consistent with preservation of principal and seeks to provide shareholders with regular income.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables or the examples below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transactions 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 and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 38.30% of the average value of the portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 38.30%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The total annual fund operating expenses do not correlate to the ratio of expenses to average net assets shown in the Fund’s Financial Highlights, which does not include Acquired Fund Fees and Expenses.
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. It assumes that you invest $10,000 in the Fund for the time periods indicated, that your investment has a 5% return each year, that the Fund’s operating expenses remain the same, and that you redeem all of your shares at the end of those periods. 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 seeks to achieve its objective by investing in a diversified portfolio of stocks and bonds. In seeking to achieve the Fund’s long-term capital growth objective, the Fund invests in common stocks of growth companies. To provide shareholders with regular income, the Fund invests in fixed-income securities and/or common stocks selected primarily for their dividend payment potential.
Between 35% and 65% of the Fund’s assets will be invested in common stocks and between 35% and 65% in fixed-income securities. The Fund’s allocation of assets will vary over time in response to Sit Investment Associates, Inc.’s (the “Adviser”) evaluation of present and anticipated market and economic conditions. The Fund may invest in
open-end
investment companies (mutual funds) and
closed-end
investment companies which invest in the same types of securities in which the Fund may invest directly.
The equity portion of the Fund’s portfolio is invested primarily in the common stocks of U.S. growth companies with a capitalization of $5 billion or more at the time of purchase.
In selecting equity securities for the Fund, the Adviser invests in growth-oriented companies it believes exhibit the potential for superior growth. The Adviser believes that a company’s earnings growth is the primary determinant of its potential long-term return and evaluates a company’s potential for above average long-term earnings and revenue growth. Several factors are considered in the Adviser’s evaluation of a company, including:
 
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unique product or service,
 
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growing product demand,
 
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dominant and growing market share,
 
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management experience and capabilities, and
 
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strong financial condition.
When selling equity securities for the Fund, the Adviser considers several factors, including changes in a company’s fundamentals and anticipated earnings.
The fixed-income portion of the Fund’s portfolio is invested primarily in a diversified portfolio of debt securities that may include the following securities:
 
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mortgage-backed securities (including collateralized mortgage obligations), such as securities issued by Government National Mortgage Association (GNMA securities are backed by the full faith and credit of the U.S. government), Federal Home Loan Mortgage Corporation (FHLMC) and Federal National Mortgage Association (FNMA) (FHLMC and FNMA securities are backed by the credit of the issuing governmental agency),
 
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asset-backed securities collateralized by assets such as automobile and credit card receivables, utilities, home improvement loans and home equity loans,
 
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obligations of the U.S. government, its agencies and instrumentalities,
 
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corporate debt securities,
 
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taxable municipal securities, and
 
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short-term debt obligations, including commercial paper and bank instruments, such as certificates of deposit, time deposits, and bankers’ acceptances. The Fund invests primarily in debt securities that, at the time of purchase, are either rated investment-grade (BBB or above by S&P Global Ratings or Baa or above by Moody’s Investor Services), or, if unrated, determined to be of comparable quality by the Adviser. Unrated securities will not exceed 20% of the fixed-income portion of the Fund’s portfolio. As of September 30, 2021 there were no unrated securities in the fixed-income portion of the Fund’s portfolio.
In selecting fixed-income securities for the Fund, the Adviser seeks fixed-income securities providing maximum total return. The Fund invests in primarily investment grade fixed-income securities. Investment grade fixed-income securities are rated at the time of purchase within the top four rating categories by a Nationally Recognized Statistical Rating Organization or of comparable quality as determined by the Adviser. In making purchase and sales decisions for the Fund, the Adviser considers its economic outlook and interest rate forecast, as well as its evaluation of a fixed-income security’s credit quality, yield, maturity, and liquidity. Based upon its economic outlook, the Adviser attempts to shift the fixed-income sector concentrations of the portfolio. Based upon its interest rate forecast, the Adviser attempts to shift the fixed-income portfolio’s average effective duration, seeking to maintain an average
Risk [Heading] rr_RiskHeading PRINCIPAL INVESTMENT RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
You could lose money by investing in the Fund​​​​​​​. The principal risks of investing in the Fund are listed below. Different risks may be more significant at different times, depending on market conditions or other factors.
 
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Market Risk: The market value of securities may fall, sometimes rapidly and unpredictably. These declines may be due to factors affecting a particular issuer, or the result of, among other things, political, regulatory, market, economic or social developments affecting the markets(s) generally. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the Fund and its investments and potentially increase the risks described herein.
The public health crisis caused by the novel coronavirus disease known as
COVID-19
has severely impacted business activity in virtually all economies, markets, and sectors and negatively impacted the value of many financial and other assets. The
COVID-19
outbreak has resulted in numerous disruptions, including travel and border restrictions, quarantines, supply chain disruptions, lower consumer demand and general market uncertainty. These events could have a significant impact on the Fund’s performance, as well as the performance and viability of issuers in which it invests. Although vaccines for
COVID-19
are becoming more widely available, the full extent and duration of the
COVID-19
outbreak and its effects cannot be determined with certainty. Similar consequences could arise as a result of the spread of other infectious diseases.
 
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Mid Cap Stock Risk: Stocks of mid cap companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies.
 
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Growth Style Investing Risk: Different types of stocks tend to shift into and out of favor with stock market investors depending on market and economic conditions. The Fund invests in growth style stocks. The Fund’s performance may at times be better or worse than the performance of funds that focus on other types of stocks or that have a broader investment style.
 
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Dividend Paying Company Risk: The Fund’s income objective may limit its ability to appreciate during a broad market advance because dividend paying stocks may not experience the same capital appreciation as
non-dividend
paying stocks. In addition, stocks held by the Fund may reduce or stop paying dividends which could affect the Fund’s ability to generate income.
 
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Income Risk: The income you earn from the Fund may decline due to declining interest rates.
 
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Interest Rate Risk: An increase in interest rates may lower the Fund’s value and the overall return on your investment. The magnitude of this decrease is often greater for longer-term fixed income securities than shorter-term securities. The Fund’s exposure to risks associated with rising interest rates may be increased due to the current period of historically low interest rates in the U.S. and the effect of potential governmental fiscal policy initiatives and resulting market reaction to those initiatives.
 
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Credit Risk: The issuers or guarantors of securities of fixed-income securities owned by the Fund may default on the payment of principal or interest, or experience a decline in credit quality, causing the value of the Fund to decrease.
 
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Prepayment and Extension Risk: Declining interest rates may compel borrowers to prepay mortgages and debt obligations underlying the mortgage-backed and asset-backed securities owned by the Fund. The proceeds received by the Fund from prepayments will likely be reinvested at interest rates lower than the original investment, thus resulting in a reduction of income to the Fund. Likewise, rising interest rates could reduce prepayments and extend the life of securities with lower interest rates, which may increase the sensitivity of the Fund’s value to rising interest rates.
 
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Call Risk: Many bonds may be redeemed (“called”) at the option of the issuer before their stated maturity date. In general, an issuer will call its bonds if they can be refinanced by issuing new bonds which bear a lower interest rate. The Fund may then be forced to invest the unanticipated proceeds at lower interest rates, resulting in a decline in the Fund’s income.
 
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Mortgage-Backed Securities Risk: The value of the Fund’s mortgage-backed securities may be affected by factors including changes in interest rates, the market value of the underlying assets, and the creditworthiness of the issuer or entities that provide credit enhancements. Mortgage-backed securities are subject to prepayment risk, and the impact of prepayments on the value of mortgage-backed securities may be difficult to predict and may result in greater volatility.
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Sector Risk: To the extent the Fund invests a significant portion of its assets in the securities of companies in the same sector of the market or region, an adverse economic, business or political development affecting that sector or region may affect the value of the Fund’s investments more, and the Fund’s investments may be more volatile, than if its investments were not so concentrated in such economic sector or geographic region.
 
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Political, Economic and Tax Risk: Because the Fund invests in municipal securities issued by states and their political subdivisions, the Fund may be particularly affected by the political and economic conditions and developments in those states.
 
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Liquidity Risk: The reduction in market making capacity and other market events has the potential to decrease liquidity and increase price volatility in the fixed income markets in which the Fund invests, particularly during periods of economic or market stress. As a result of this decreased liquidity, the Fund many have to accept a lower price to sell a security, sell other securities to raise cash, or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. If the Fund needed to sell large blocks of bonds to meet shareholder redemption requests or to raise cash, those sales could further reduce the bonds’ prices and hurt performance.
 
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Investment Company Risk: To the extent that the Fund invests in shares of another investment company, it will indirectly absorb its pro rata share of such investment company’s operation expenses, including investment advisory and administrative fees, which will reduce the Fund’s return on such investment relative to investment alternatives that do not include such expenses. In addition, the ability of the Fund to achieve its investment objective will partially depend upon the ability of the acquired fund to achieve its investment objective.
 
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Management Risk: A strategy used by the investment management team may not produce the intended results.
 
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Cybersecurity Risk: Cybersecurity breaches may allow an unauthorized party to gain access to Fund assets, shareholder data, or proprietary information, or cause the Fund and/or its service providers to suffer data corruption or lose operational functionality.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the Fund
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading HISTORICAL PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following bar chart and table provide information on the Fund’s volatility and performance. The Fund’s past performance before and after taxes is not necessarily an indication of how the Fund will perform in the future.​​​​​​​ The bar chart below is intended to provide you with an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year.
The table below compares the Fund’s performance over different time periods to that of the Fund’s benchmark indices which are broad measures of market performance.
After-tax
returns are calculated using historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual
after-tax
returns depend on an investor’s tax situation and may differ from those shown.
After-tax
returns shown are not relevant to investors who hold their Fund shares through
tax-deferred
arrangements, such as 401(k) plans or individual retirement accounts.
The performance information reflects Fund expenses, and assumes that all distributions have been reinvested. The benchmark indices are unmanaged, have no expenses, and it is not possible to invest directly in an index. Updated performance information is available at the Fund’s website at www.sitfunds.com or by calling
800-332-5580.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart below is intended to provide you with an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year.The table below compares the Fund’s performance over different time periods to that of the Fund’s benchmark indices which are broad measures of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-332-5580
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.sitfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance before and after taxes is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns for calendar years ended December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
The Fund’s
year-to-date
return as of 9/30/21 (not annualized) was 10.60%.
Best Quarter: 16.14% (2Q20)
Worst Quarter:
-9.97%
(3Q20)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns for periods ended December 31, 2020
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
SIT MUTUAL FUNDS INC | Sit Balanced Fund | Sit Balanced Fund  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 1.00%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.05% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.05% [1]
1 Year rr_ExpenseExampleYear01 $ 107
3 Years rr_ExpenseExampleYear03 334
5 Years rr_ExpenseExampleYear05 580
10 Years rr_ExpenseExampleYear10 $ 1,288
2011 rr_AnnualReturn2011 2.04%
2012 rr_AnnualReturn2012 9.95%
2013 rr_AnnualReturn2013 18.36%
2014 rr_AnnualReturn2014 9.15%
2015 rr_AnnualReturn2015 2.25%
2016 rr_AnnualReturn2016 4.60%
2017 rr_AnnualReturn2017 17.74%
2018 rr_AnnualReturn2018 (2.73%)
2019 rr_AnnualReturn2019 20.69%
2020 rr_AnnualReturn2020 20.74%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 10.60%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.14%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (9.97%)
1 Year rr_AverageAnnualReturnYear01 20.74%
5 Years rr_AverageAnnualReturnYear05 11.79%
10 Years rr_AverageAnnualReturnYear10 9.97%
SIT MUTUAL FUNDS INC | Sit Balanced Fund | After Taxes on Distributions | Sit Balanced Fund  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 20.21%
5 Years rr_AverageAnnualReturnYear05 10.84%
10 Years rr_AverageAnnualReturnYear10 9.11%
SIT MUTUAL FUNDS INC | Sit Balanced Fund | After Taxes on Distributions and Sales | Sit Balanced Fund  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 12.51%
5 Years rr_AverageAnnualReturnYear05 9.16%
10 Years rr_AverageAnnualReturnYear10 7.96%
SIT MUTUAL FUNDS INC | Sit Balanced Fund | Barclays Capital Aggregate Bond Index (reflects no deduction for fees, expenses or taxes) [Member]  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.51%
5 Years rr_AverageAnnualReturnYear05 4.44%
10 Years rr_AverageAnnualReturnYear10 3.84%
SIT MUTUAL FUNDS INC | Sit Balanced Fund | SP 500 Index (reflects no deduction for fees, expenses or taxes) [Member]  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 18.40%
5 Years rr_AverageAnnualReturnYear05 15.22%
10 Years rr_AverageAnnualReturnYear10 13.89%
[1] The total annual fund operating expenses do not correlate to the ratio of expenses to average net assets shown in the Fund’s Financial Highlights, which does not include Acquired Fund Fees and Expenses. Acquired Fund Fees and Expenses represent fees and expenses incurred indirectly by the Fund as a result of its investment in shares of investment companies.