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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName T. Rowe Price State Tax-Free Income Trust
Prospectus Date rr_ProspectusDate Jul. 01, 2012
Maryland Tax-Free Bond Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

SUMMARY

Maryland Tax-Free Bond Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The fund seeks to provide, consistent with prudent portfolio management, the highest level of income exempt from federal and Maryland state and local income taxes by investing primarily in investment-grade Maryland municipal bonds.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption

Fees and Expenses of the Fund

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 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 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 or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 12.5% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 12.50%
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 all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Investments, Risks, and Performance

Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The fund will invest so that, under normal market conditions, at least 80% of its net assets (including any borrowings for investment purposes) are invested in bonds that pay interest exempt from federal and Maryland state and local income taxes, and at least 80% of the fund’s income is expected to be exempt from federal and Maryland state and local income taxes. While the fund may buy securities of any maturity, the fund’s weighted average maturity is expected to normally exceed 10 years. Most investments are in investment-grade securities, which are securities rated within one of the four highest credit categories (AAA, AA, A, or BBB, or an equivalent rating) by at least one major credit rating agency or, if unrated, deemed to be of comparable quality by T. Rowe Price. However, the fund may invest up to 10% of its total assets in noninvestment-grade securities, known as “junk” bonds in the taxable bond markets, including those with the lowest credit rating. In addition, up to 20% of the fund’s income could be derived from securities subject to the alternative minimum tax.

Investment decisions for the fund reflect the portfolio manager’s outlook for interest rates and the economy, as well as the prices, yields, and credit quality of various securities. This approach is designed to help the portfolio manager capture appreciation opportunities when rates are falling and reduce the impact of falling bond prices when rates are rising. For example, if interest rates are expected to fall, the fund may purchase longer-term securities in an attempt to seek higher yields and/or capital appreciation. Conversely, if interest rates are expected to rise, the fund may seek securities with shorter maturities. And if our economic outlook is positive or if valuations for lower-quality bonds are attractive, the portfolio manager may take advantage of the fund’s “basket” for noninvestment-grade bonds.

The fund may invest a significant portion of assets in securities that are not general obligations of the state. These may be issued by local governments or public authorities and are rated according to their particular creditworthiness, which may vary from the state’s general obligation securities. From time to time, the fund may invest a significant portion of its assets in sectors with special risks, such as health care, transportation, utilities, or private activity bonds.

The fund may also invest in obligations of the commonwealth of Puerto Rico and its public corporations (as well as the U.S. territories of Guam and the Virgin Islands) whose interest is exempt from federal and Maryland state and local income taxes. These securities may generally be purchased when they offer a comparably attractive combination of risk and return.

Due to seasonal variations in the supply of suitable Maryland municipal securities, the fund may invest in other municipal securities whose interest is exempt from federal but not Maryland income taxes. While efforts will be made to minimize such investments, they could comprise up to 10% of the fund’s annual income.

The fund may sell holdings for a variety of reasons, such as to adjust the portfolio’s average maturity, duration, or credit quality, or to shift assets into and out of higher-yielding securities.

The fund is “nondiversified,” meaning it may invest a greater portion of its assets in fewer issuers than is permissible for a “diversified” fund.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock As with any mutual fund, there is no guarantee that the fund will achieve its objective. The fund’s share price fluctuates, which means you could lose money by investing in the fund. The principal risks of investing in this fund are summarized as follows:

Active management risk The fund is subject to the risk that the investment adviser’s judgments about the attractiveness, value, or potential appreciation of the fund’s investments may prove to be incorrect. If the securities selected and strategies employed by the fund fail to produce the intended results, the fund could underperform other funds with similar objectives and investment strategies.

Credit risk This is the risk that an issuer of a debt security could suffer an adverse change in financial condition that results in a payment default, security downgrade, or inability to meet a financial obligation. Economic downturns often result in reduced levels of taxes collected and revenues earned for municipalities. This, in turn, lessens the financial strength of a municipality and increases the credit risk of the securities it issues. The fund’s exposure to credit risk is increased to the extent the fund invests in noninvestment-grade bonds (“junk” bonds). Junk bonds should be considered speculative as they carry greater risk of default and erratic price swings due to adverse changes in the credit quality of the issuer.

Interest rate risk This is the risk that a rise in interest rates will cause the price of a fixed rate debt security to fall. Generally, the longer the maturity of a security or weighted average maturity of a fund, the greater the interest rate risk.

Municipal securities risk The fund will be highly impacted by events tied to the overall municipal securities markets, which can be very volatile and significantly affected by unfavorable legislative or political developments and adverse changes in the financial conditions of municipal securities issuers and the economy. Income from municipal securities held by the fund could be declared taxable because of changes in tax laws or interpretations by taxing authorities, or noncompliant conduct of a municipal security issuer. In addition, a portion of the fund’s otherwise tax-exempt dividends may be taxable to those shareholders subject to the alternative minimum tax. Any fund investments in obligations of Puerto Rico or U.S. territories involve additional credit and tax risks.

Certain sectors of the municipal bond market have special risks that can impact such sectors more significantly than the market as a whole. For example, health care can be hurt by rising expenses and dependency on third party reimbursements, transportation can be impacted by declining revenues or unexpectedly high construction costs, utilities are subject to governmental rate regulation, and private activity bonds rely on project revenues and the creditworthiness of the corporate user as opposed to governmental support.

State-specific risk This refers to the risk that developments in Maryland will adversely affect the securities held by the fund. Because the fund invests primarily in securities issued by Maryland and its municipalities, it is more vulnerable to unfavorable developments in Maryland than are funds that invest in municipal securities of many states. Adverse developments in an economic sector may have far-reaching impacts on the overall Maryland municipal securities market. A bond default or credit rating downgrade, or even negative perceptions of the ability to make timely bond payments, involving only a small number of Maryland municipal securities issuers could affect the market values and marketability of all Maryland municipal securities.

As of May 1, 2012, the state of Maryland’s general obligation debt was rated Aaa by Moody’s and AAA by both Standard & Poor’s (S&P) and Fitch. While S&P and Fitch maintain a stable outlook, Moody’s has assigned a negative outlook.

Liquidity risk This is the risk that the fund may not be able to sell a holding in a timely manner at a desired price. The secondary market for certain municipal bonds tends to be less developed and liquid than many other securities markets, which may adversely affect the fund’s ability to sell such municipal bonds at attractive prices.

Nondiversification risk As a nondiversified fund, the fund has the ability to invest a larger percentage of its assets in the securities of a smaller number of issuers than a diversified fund. As a result, poor performance by a single issuer could adversely affect fund performance more than if the fund were invested in a larger number of issuers. The fund’s share price can be expected to fluctuate more than that of a comparable diversified fund.
Risk Lose Money [Text] rr_RiskLoseMoney The fund’s share price fluctuates, which means you could lose money by investing in the fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Nondiversification risk As a nondiversified fund, the fund has the ability to invest a larger percentage of its assets in the securities of a smaller number of issuers than a diversified fund. As a result, poor performance by a single issuer could adversely affect fund performance more than if the fund were invested in a larger number of issuers. The fund’s share price can be expected to fluctuate more than that of a comparable diversified fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index. The fund’s past performance (before and after taxes) is not necessarily an indication of future performance.

The fund can also experience short-term performance swings, as shown by the best and worst calendar quarter returns during the years depicted.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart showing calendar year returns and the average annual total returns table indicate risk by illustrating how much returns can differ from one year to the next and how fund performance compares with that of a comparable market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-225-5132
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress troweprice.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 future performance.
Bar Chart [Heading] rr_BarChartHeading
Maryland Tax-Free Bond Fund
Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Quarter
 Ended		 Total
Return
Best Quarter 9/30/09 7.22%
Worst Quarter 12/31/10 -4.36%
The fund's return for the three months ended 3/31/12 was 2.21%.
Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns

Periods ended
December 31, 2011
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the 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 After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as a 401(k) account or individual retirement account.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock In addition, the average annual total returns table shows hypothetical after-tax returns to suggest how taxes paid by a shareholder may influence returns. After-tax returns are calculated using the 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 a 401(k) account or individual retirement account.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Updated performance information is available through troweprice.com or may be obtained by calling 1-800-225-5132.
Maryland Tax-Free Bond Fund | Maryland Tax-Free Bond Fund
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOther none
Redemption fee rr_RedemptionFeeOverRedemption none
Maximum account fee rr_MaximumAccountFee 20 [1]
Management fees rr_ManagementFeesOverAssets 0.40%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.06%
Total annual fund operating expenses rr_ExpensesOverAssets 0.46%
1 year rr_ExpenseExampleYear01 47
3 years rr_ExpenseExampleYear03 148
5 years rr_ExpenseExampleYear05 258
10 years rr_ExpenseExampleYear10 579
2002 rr_AnnualReturn2002 9.47%
2003 rr_AnnualReturn2003 4.86%
2004 rr_AnnualReturn2004 3.51%
2005 rr_AnnualReturn2005 3.31%
2006 rr_AnnualReturn2006 4.55%
2007 rr_AnnualReturn2007 1.90%
2008 rr_AnnualReturn2008 (6.67%)
2009 rr_AnnualReturn2009 17.98%
2010 rr_AnnualReturn2010 1.99%
2011 rr_AnnualReturn2011 10.08%
Year to Date Return, Label rr_YearToDateReturnLabel The fund’s return for the three months ended
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2012
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 2.21%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.22%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (4.36%)
1 Year rr_AverageAnnualReturnYear01 10.08%
5 Years rr_AverageAnnualReturnYear05 4.73%
10 Years rr_AverageAnnualReturnYear10 4.92%
Maryland Tax-Free Bond Fund | Returns after taxes on distributions | Maryland Tax-Free Bond Fund
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.08%
5 Years rr_AverageAnnualReturnYear05 4.71%
10 Years rr_AverageAnnualReturnYear10 4.91%
Maryland Tax-Free Bond Fund | Returns after taxes on distributions and sale of fund shares | Maryland Tax-Free Bond Fund
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.13%
5 Years rr_AverageAnnualReturnYear05 4.67%
10 Years rr_AverageAnnualReturnYear10 4.86%
Maryland Tax-Free Bond Fund | Barclays Municipal Bond Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.70%
5 Years rr_AverageAnnualReturnYear05 5.22%
10 Years rr_AverageAnnualReturnYear10 5.38%
Maryland Tax-Free Bond Fund | Lipper Maryland Municipal Debt Funds Average
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 9.40%
5 Years rr_AverageAnnualReturnYear05 3.66%
10 Years rr_AverageAnnualReturnYear10 4.32%
[1] Subject to certain exceptions, accounts with a balance of less than $10,000 are charged an annual $20 fee.