File No. 33-10238
811-04906
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM N-1A
REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 [X]
Pre-Effective Amendment No. [__]
Post-Effective Amendment No. 79 [X]
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 [X]
Amendment No. 79 [X]
(Check appropriate box or boxes.)
BNY Mellon State Municipal Bond Funds
(Exact Name of Registrant as Specified in Charter)
c/o BNY Mellon Investment Adviser, Inc.
240 Greenwich Street, New York, New York 10286
(Address of Principal Executive Offices) (Zip Code)
Registrant's Telephone Number, including Area Code: (212) 922-6400
Bennett A. MacDougall, Esq.
240 Greenwich Street
New York, New York 10286
(Name and Address of Agent for Service)
It is proposed that this filing will become effective (check appropriate box)
X__ immediately upon filing pursuant to paragraph (b)
_____ on (date) pursuant to paragraph (b)
_____ (days) days after filing pursuant to paragraph (a)(1)
_____ on (date) pursuant to paragraph (a)(1)
_____ (days) days after filing pursuant to paragraph (a)(2)
_____ on (date) pursuant to paragraph (a)(2) of Rule 485
If appropriate, check the following box:
_____ this post-effective amendment designates a new effective date for a previously filed post-effective amendment.
SIGNATURES
Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant BNY Mellon State Municipal Bond Funds certifies that it meets all of the requirements for effectiveness of this Amendment to the Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Amendment to the Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of New York, and State of New York on the 17th day of September 2019.
BNY Mellon State Municipal Bond Funds
|
BY: |
/s/ Renee LaRoche-Morris* |
|
Renee LaRoche-Morris, PRESIDENT | |
Pursuant to the requirements of the Securities Act of 1933, this Amendment to the Registration Statement has been signed below by the following persons in the capacities and on the date indicated.
|
Signatures |
Title |
Date | ||
|
/s/ Renee LaRoche-Morris* |
President (Principal Executive Officer) |
09/17/19 | ||
|
Renee LaRoche-Morris |
||||
|
/s/ James Windels* |
Treasurer (Principal Financial |
09/17/19 | ||
|
James Windels |
||||
|
/s/ Joseph S. DiMartino* |
Chairman of the Board |
09/17/19 | ||
|
Joseph S. DiMartino |
||||
|
/s/ Francine J. Bovich* |
Board Member |
09/17/19 | ||
|
Francine J. Bovich |
||||
|
/s/ Peggy C. Davis* |
Board Member |
09/17/19 | ||
|
Peggy C. Davis |
||||
|
/s/ Diane Dunst* |
Board Member |
09/17/19 | ||
|
Diane Dunst |
||||
|
/s/ Nathan Leventhal* |
Board Member |
09/17/19 | ||
|
Nathan Leventhal |
||||
|
/s/ Robin A. Melvin* |
Board Member |
09/17/19 | ||
|
Robin A. Melvin |
||||
|
*BY: |
/s/ Natalya Zelensky |
INDEX OF EXHIBITS
Exhibits
EX-101.INS – Instance Document.
EX-101.SCH – Taxonomy.
EX-101.CAL – Calculation Linkbase.
EX-101.DEF – Definition Linkbase.
EX-101.LAB – Labels Linkbase.
EX-101.PRE – Presentation Linkbase.
| Label | Element | Value | ||||
|---|---|---|---|---|---|---|
| BNY Mellon Connecticut Fund | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk/Return [Heading] | rr_RiskReturnHeading | Fund Summary - BNY Mellon Connecticut Fund | ||||
| Objective [Heading] | rr_ObjectiveHeading | Investment Objective | ||||
| Objective, Primary [Text Block] | rr_ObjectivePrimaryTextBlock | The fund seeks to maximize current income exempt from federal income tax and from Connecticut state income tax, without undue risk. |
||||
| 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. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or shares of other funds in the BNY Mellon Family of Funds that are subject to a sales charge. More information about sales charges, including these and other discounts and waivers, is available from your financial professional and in the Shareholder Guide section beginning on page 21 of the prospectus and in the How to Buy Shares section and the Additional Information About How to Buy Shares section beginning on page II-1 and page III-1, respectively, of the fund's Statement of Additional Information. |
||||
| 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) | ||||
| Fee Waiver or Reimbursement over Assets, Date of Termination | rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination | Aug. 30, 2020 | ||||
| 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 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 4.84% of the average value of its portfolio. |
||||
| Portfolio Turnover, Rate | rr_PortfolioTurnoverRate | 4.84% | ||||
| Expense Breakpoint Discounts [Text] | rr_ExpenseBreakpointDiscounts | You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or shares of other funds in the BNY Mellon Family of Funds that are subject to a sales charge. | ||||
| Expense Breakpoint, Minimum Investment Required [Amount] | rr_ExpenseBreakpointMinimumInvestmentRequiredAmount | $ 50,000 | ||||
| Expense Example [Heading] | rr_ExpenseExampleHeading | Example | ||||
| Expense Example Narrative [Text Block] | rr_ExpenseExampleNarrativeTextBlock | The 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. The one-year example and the first year of the three-, five- and ten-years examples are based on net operating expenses, restated to reflect the current expense limitation agreement by BNY Mellon Investment Adviser, Inc. Although your actual costs may be higher or lower, based on these assumptions your costs would be: |
||||
| Expense Example, No Redemption, By Year, Caption [Text] | rr_ExpenseExampleNoRedemptionByYearCaption | You would pay the following expenses if you did not redeem your shares: | ||||
| Strategy [Heading] | rr_StrategyHeading | Principal Investment Strategy | ||||
| Strategy Narrative [Text Block] | rr_StrategyNarrativeTextBlock | To pursue its goal, the fund normally invests at least 80% of its net assets, plus any borrowings for investment purposes, in municipal bonds that provide income exempt from federal and Connecticut state income taxes. Municipal bonds are debt securities or other obligations issued by states, territories and possessions of the United States and the District of Columbia and their political subdivisions, agencies and instrumentalities, or multistate agencies and authorities, and certain other specified securities. The fund invests at least 70% of its assets in municipal bonds rated, at the time of purchase, investment grade (i.e., Baa/BBB or higher) or the unrated equivalent as determined by BNY Mellon Investment Adviser, Inc. For additional yield, the fund may invest up to 30% of its assets in municipal bonds rated below investment grade ("high yield" or "junk" bonds) or the unrated equivalent as determined by BNY Mellon Investment Adviser, Inc. The dollar-weighted average maturity of the fund's portfolio normally exceeds ten years, but the fund may invest without regard to maturity. A bond's maturity is the length of time until the principal must be fully repaid with interest. Dollar-weighted average maturity is an average of the stated maturities of the bonds held by the fund, based on their dollar-weighted proportions in the fund. The fund's portfolio managers focus on identifying undervalued sectors and securities. To select municipal bonds for the fund, the portfolio managers use fundamental credit analysis to estimate the relative value and attractiveness of various sectors and securities and actively trade among various sectors based on their apparent relative values. Although the fund seeks to provide income exempt from federal and Connecticut state income taxes, income from some of the fund's holdings may be subject to the federal alternative minimum tax. |
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| Risk [Heading] | rr_RiskHeading | Principal Risks | ||||
| Risk Narrative [Text Block] | rr_RiskNarrativeTextBlock | An investment in the fund is not a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. It is not a complete investment program. The fund's share price fluctuates, sometimes dramatically, which means you could lose money. · Municipal securities risk. The amount of public information available about municipal securities is generally less than that for corporate equities or bonds. Special factors, such as legislative changes, and state and local economic and business developments, may adversely affect the yield and/or value of the fund's investments in municipal securities. Other factors include the general conditions of the municipal securities market, the size of the particular offering, the maturity of the obligation and the rating of the issue. Changes in economic, business or political conditions relating to a particular municipal project, municipality, or state, territory or possession of the United States in which the fund invests may have an impact on the fund's share price. · Interest rate risk. Prices of bonds and other fixed rate fixed-income securities tend to move inversely with changes in interest rates. Typically, a rise in rates will adversely affect fixed-income securities and, accordingly, will cause the value of the fund's investments in these securities to decline. During periods of very low interest rates, which occur from time to time due to market forces or actions of governments and/or their central banks, including the Board of Governors of the Federal Reserve System in the U.S., the fund may be subject to a greater risk of principal decline from rising interest rates. When interest rates fall, the fund's investments in new securities may be at lower yields and may reduce the fund's income. The magnitude of these fluctuations in the market price of fixed-income securities is generally greater for securities with longer effective maturities and durations because such instruments do not mature, reset interest rates or become callable for longer periods of time. Unlike investment grade bonds, however, the prices of high yield ("junk") bonds may fluctuate unpredictably and not necessarily inversely with changes in interest rates. · Credit risk. Failure of an issuer of a security to make timely interest or principal payments when due, or a decline or perception of a decline in the credit quality of the security, can cause the security's price to fall. The lower a security's credit rating, the greater the chance that the issuer of the security will default or fail to meet its payment obligations. · High yield securities risk. High yield ("junk") securities involve greater credit risk, including the risk of default, than investment grade securities, and are considered predominantly speculative with respect to the issuer's ability to make principal and interest payments. The prices of high yield securities can fall in response to bad news about the issuer or its industry, or the economy in general, to a greater extent than those of higher rated securities. · Liquidity risk. When there is little or no active trading market for specific types of securities, it can become more difficult to sell the securities in a timely manner at or near their perceived value. In such a market, the value of such securities and the fund's share price may fall dramatically. The secondary market for certain municipal bonds tends to be less well developed or liquid than many other securities markets, which may adversely affect the fund's ability to sell such municipal bonds at attractive prices. Investments that are illiquid or that trade in lower volumes may be more difficult to value. The market for below investment grade securities may be less liquid and therefore these securities may be harder to value or sell at an acceptable price, especially during times of market volatility or decline. Liquidity risk also may refer to the risk that the fund will not be able to pay redemption proceeds within the allowable time period stated in this prospectus because of unusual market conditions, an unusually high volume of redemption requests, or other reasons. To meet redemption requests, the fund may be forced to sell securities at an unfavorable time and/or under unfavorable conditions, which may adversely affect the fund's share price. · State-specific risk. The fund is subject to the risk that Connecticut's economy, and the revenues underlying its municipal obligations, may decline. Investing primarily in the municipal obligations of a single state makes the fund more sensitive to risks specific to that state and may entail more risk than investing in the municipal obligations of multiple states as a result of potentially less diversification. · Non-diversification risk. The fund is non-diversified, which means that the fund may invest a relatively high percentage of its assets in a limited number of issuers. Therefore, the fund's performance may be more vulnerable to changes in the market value of a single issuer or group of issuers and more susceptible to risks associated with a single economic, political or regulatory occurrence than a diversified fund. · Management risk. The investment process used by the fund's portfolio managers could fail to achieve the fund's investment goal and cause your fund investment to lose value. |
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| Risk Lose Money [Text] | rr_RiskLoseMoney | The fund's share price fluctuates, sometimes dramatically, which means you could lose money. | ||||
| Risk Nondiversified Status [Text] | rr_RiskNondiversifiedStatus | The fund is non-diversified, which means that the fund may invest a relatively high percentage of its assets in a limited number of issuers. Therefore, the fund's performance may be more vulnerable to changes in the market value of a single issuer or group of issuers and more susceptible to risks associated with a single economic, political or regulatory occurrence than a diversified fund. | ||||
| RIsk Not Insured [Text] | rr_RiskNotInsured | An investment in the fund is not a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. | ||||
| Bar Chart and Performance Table [Heading] | rr_BarChartAndPerformanceTableHeading | Performance | ||||
| Performance Narrative [Text Block] | rr_PerformanceNarrativeTextBlock | The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the performance of the fund's Class A shares from year to year. Sales charges, if any, are not reflected in the bar chart, and, if those charges were included, returns would have been less than those shown. The table compares the average annual total returns of the fund's shares to those of a broad measure of market performance. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. More recent performance information may be available at www.bnymellonim.com/us. |
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| Performance Information Illustrates Variability of Returns [Text] | rr_PerformanceInformationIllustratesVariabilityOfReturns | The following bar chart and table provide some indication of the risks of investing in the fund. | ||||
| Performance Availability Website Address [Text] | rr_PerformanceAvailabilityWebSiteAddress | www.bnymellonim.com/us | ||||
| 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 | Year-by-Year Total Returns as of 12/31 each year (%) Class A | ||||
| Bar Chart Does Not Reflect Sales Loads [Text] | rr_BarChartDoesNotReflectSalesLoads | Sales charges, if any, are not reflected in the bar chart, and, if those charges were included, returns would have been less than those shown. | ||||
| Bar Chart Closing [Text Block] | rr_BarChartClosingTextBlock |
The year-to-date total return of the fund's Class A shares as of June 30, 2019 was 4.50%.
|
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| Year to Date Return, Label | rr_YearToDateReturnLabel | year-to-date total return | ||||
| Bar Chart, Year to Date Return, Date | rr_BarChartYearToDateReturnDate | Jun. 30, 2019 | ||||
| Bar Chart, Year to Date Return | rr_BarChartYearToDateReturn | 4.50% | ||||
| Highest Quarterly Return, Label | rr_HighestQuarterlyReturnLabel | Best Quarter | ||||
| Highest Quarterly Return, Date | rr_BarChartHighestQuarterlyReturnDate | Sep. 30, 2009 | ||||
| Highest Quarterly Return | rr_BarChartHighestQuarterlyReturn | 6.83% | ||||
| Lowest Quarterly Return, Label | rr_LowestQuarterlyReturnLabel | Worst Quarter | ||||
| Lowest Quarterly Return, Date | rr_BarChartLowestQuarterlyReturnDate | Dec. 31, 2010 | ||||
| Lowest Quarterly Return | rr_BarChartLowestQuarterlyReturn | (4.43%) | ||||
| Index No Deduction for Fees, Expenses, Taxes [Text] | rr_IndexNoDeductionForFeesExpensesTaxes | reflects no deductions for fees, expenses or taxes | ||||
| 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 | Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through U.S. tax-deferred arrangements such as 401(k) plans or individual retirement accounts. | ||||
| Performance Table One Class of after Tax Shown [Text] | rr_PerformanceTableOneClassOfAfterTaxShown | After-tax performance is shown only for Class A shares. After-tax performance of the fund's other share classes will vary. | ||||
| Performance Table Explanation after Tax Higher | rr_PerformanceTableExplanationAfterTaxHigher | Returns after taxes on distributions and sale of fund shares may be higher than returns before taxes or returns after taxes on distributions due to an assumed tax benefit from losses on a sale of the fund's shares at the end of the period. | ||||
| Performance Table Narrative | rr_PerformanceTableNarrativeTextBlock | After-tax performance is shown only for Class A shares. After-tax performance of the fund's other share classes will vary. 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 the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through U.S. tax-deferred arrangements such as 401(k) plans or individual retirement accounts. Returns after taxes on distributions and sale of fund shares may be higher than returns before taxes or returns after taxes on distributions due to an assumed tax benefit from losses on a sale of the fund's shares at the end of the period. For the fund's Y shares, periods prior to the inception date reflect the performance of the fund's Class A shares, not reflecting any applicable sales charges for Class A shares. Such performance figures have not been adjusted to reflect applicable class fees and expenses. Each share class is invested in the same portfolio of securities, and the annual returns would have differed only to the extent that the classes have different expenses. |
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| Average Annual Return, Caption | rr_AverageAnnualReturnCaption | Average Annual Total Returns (as of 12/31/18) | ||||
| BNY Mellon Connecticut Fund | Bloomberg Barclays U.S. Municipal Bond Index reflects no deductions for fees, expenses or taxes | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | 1.28% | ||||
| Average Annual Returns, 5 Years | rr_AverageAnnualReturnYear05 | 3.82% | ||||
| Average Annual Returns, 10 Years | rr_AverageAnnualReturnYear10 | 4.85% | ||||
| BNY Mellon Connecticut Fund | Class A | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Maximum sales charge (load) imposed on purchases (as a percentage of offering price) | rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 4.50% | ||||
| Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) | rr_MaximumDeferredSalesChargeOverOfferingPrice | none | [1] | |||
| Management fees | rr_ManagementFeesOverAssets | 0.55% | ||||
| Distribution (12b-1) fees | rr_DistributionAndService12b1FeesOverAssets | none | ||||
| Shareholder services fees | rr_Component1OtherExpensesOverAssets | 0.25% | ||||
| Miscellaneous other expenses | rr_Component3OtherExpensesOverAssets | 0.15% | ||||
| Total other expenses | rr_OtherExpensesOverAssets | 0.40% | ||||
| Total annual fund operating expenses | rr_ExpensesOverAssets | 0.95% | ||||
| Fee waiver and/or expense reimbursement | rr_FeeWaiverOrReimbursementOverAssets | (0.10%) | [2] | |||
| Total annual fund operating expenses (after fee waiver and/or expenses reimbursement) | rr_NetExpensesOverAssets | 0.85% | ||||
| Expenses Deferred Charges [Text Block] | rr_ExpensesDeferredChargesTextBlock | Class A shares bought without an initial sales charge as part of an investment of $1 million or more may be charged a deferred sales charge of 1.00% if redeemed within one year. | ||||
| Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | $ 533 | ||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 730 | ||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 943 | ||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | 1,555 | ||||
| Expense Example, No Redemption, 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 533 | ||||
| Expense Example, No Redemption, 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 730 | ||||
| Expense Example, No Redemption, 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 943 | ||||
| Expense Example, No Redemption, 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 1,555 | ||||
| Annual Return 2009 | rr_AnnualReturn2009 | 16.31% | ||||
| Annual Return 2010 | rr_AnnualReturn2010 | 1.33% | ||||
| Annual Return 2011 | rr_AnnualReturn2011 | 10.38% | ||||
| Annual Return 2012 | rr_AnnualReturn2012 | 6.60% | ||||
| Annual Return 2013 | rr_AnnualReturn2013 | (5.99%) | ||||
| Annual Return 2014 | rr_AnnualReturn2014 | 9.19% | ||||
| Annual Return 2015 | rr_AnnualReturn2015 | 2.96% | ||||
| Annual Return 2016 | rr_AnnualReturn2016 | (0.57%) | ||||
| Annual Return 2017 | rr_AnnualReturn2017 | 3.73% | ||||
| Annual Return 2018 | rr_AnnualReturn2018 | 0.41% | ||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | (4.11%) | ||||
| Average Annual Returns, 5 Years | rr_AverageAnnualReturnYear05 | 2.14% | ||||
| Average Annual Returns, 10 Years | rr_AverageAnnualReturnYear10 | 3.78% | ||||
| BNY Mellon Connecticut Fund | Class A | After Taxes on Distributions | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | (4.11%) | ||||
| Average Annual Returns, 5 Years | rr_AverageAnnualReturnYear05 | 2.14% | ||||
| Average Annual Returns, 10 Years | rr_AverageAnnualReturnYear10 | 3.78% | ||||
| BNY Mellon Connecticut Fund | Class A | After Taxes on Distributions and Sale of Fund Shares | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | (1.44%) | ||||
| Average Annual Returns, 5 Years | rr_AverageAnnualReturnYear05 | 2.29% | ||||
| Average Annual Returns, 10 Years | rr_AverageAnnualReturnYear10 | 3.71% | ||||
| BNY Mellon Connecticut Fund | Class C | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Maximum sales charge (load) imposed on purchases (as a percentage of offering price) | rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | none | ||||
| Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) | rr_MaximumDeferredSalesChargeOverOfferingPrice | 1.00% | ||||
| Management fees | rr_ManagementFeesOverAssets | 0.55% | ||||
| Distribution (12b-1) fees | rr_DistributionAndService12b1FeesOverAssets | 0.75% | ||||
| Shareholder services fees | rr_Component1OtherExpensesOverAssets | 0.25% | ||||
| Miscellaneous other expenses | rr_Component3OtherExpensesOverAssets | 0.20% | ||||
| Total other expenses | rr_OtherExpensesOverAssets | 0.45% | ||||
| Total annual fund operating expenses | rr_ExpensesOverAssets | 1.75% | ||||
| Fee waiver and/or expense reimbursement | rr_FeeWaiverOrReimbursementOverAssets | (0.10%) | [2] | |||
| Total annual fund operating expenses (after fee waiver and/or expenses reimbursement) | rr_NetExpensesOverAssets | 1.65% | ||||
| Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | $ 268 | ||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 541 | ||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 940 | ||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | 2,054 | ||||
| Expense Example, No Redemption, 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 168 | ||||
| Expense Example, No Redemption, 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 541 | ||||
| Expense Example, No Redemption, 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 940 | ||||
| Expense Example, No Redemption, 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 2,054 | ||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | (1.37%) | ||||
| Average Annual Returns, 5 Years | rr_AverageAnnualReturnYear05 | 2.28% | ||||
| Average Annual Returns, 10 Years | rr_AverageAnnualReturnYear10 | 3.47% | ||||
| BNY Mellon Connecticut Fund | Class I | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Maximum sales charge (load) imposed on purchases (as a percentage of offering price) | rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | none | ||||
| Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) | rr_MaximumDeferredSalesChargeOverOfferingPrice | none | ||||
| Management fees | rr_ManagementFeesOverAssets | 0.55% | ||||
| Distribution (12b-1) fees | rr_DistributionAndService12b1FeesOverAssets | none | ||||
| Miscellaneous other expenses | rr_Component3OtherExpensesOverAssets | 0.17% | ||||
| Total other expenses | rr_OtherExpensesOverAssets | 0.17% | ||||
| Total annual fund operating expenses | rr_ExpensesOverAssets | 0.72% | ||||
| Fee waiver and/or expense reimbursement | rr_FeeWaiverOrReimbursementOverAssets | (0.10%) | [2] | |||
| Total annual fund operating expenses (after fee waiver and/or expenses reimbursement) | rr_NetExpensesOverAssets | 0.62% | ||||
| Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | $ 63 | ||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 220 | ||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 391 | ||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | 885 | ||||
| Expense Example, No Redemption, 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 63 | ||||
| Expense Example, No Redemption, 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 220 | ||||
| Expense Example, No Redemption, 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 391 | ||||
| Expense Example, No Redemption, 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 885 | ||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | 0.64% | ||||
| Average Annual Returns, 5 Years | rr_AverageAnnualReturnYear05 | 3.34% | ||||
| Average Annual Returns, 10 Years | rr_AverageAnnualReturnYear10 | 4.52% | ||||
| BNY Mellon Connecticut Fund | Class Y | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Maximum sales charge (load) imposed on purchases (as a percentage of offering price) | rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | none | ||||
| Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) | rr_MaximumDeferredSalesChargeOverOfferingPrice | none | ||||
| Management fees | rr_ManagementFeesOverAssets | 0.55% | ||||
| Distribution (12b-1) fees | rr_DistributionAndService12b1FeesOverAssets | none | ||||
| Miscellaneous other expenses | rr_Component3OtherExpensesOverAssets | 0.13% | ||||
| Total other expenses | rr_OtherExpensesOverAssets | 0.13% | ||||
| Total annual fund operating expenses | rr_ExpensesOverAssets | 0.68% | ||||
| Fee waiver and/or expense reimbursement | rr_FeeWaiverOrReimbursementOverAssets | (0.10%) | [2] | |||
| Total annual fund operating expenses (after fee waiver and/or expenses reimbursement) | rr_NetExpensesOverAssets | 0.58% | ||||
| Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | $ 59 | ||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 207 | ||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 369 | ||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | 837 | ||||
| Expense Example, No Redemption, 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 59 | ||||
| Expense Example, No Redemption, 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 207 | ||||
| Expense Example, No Redemption, 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 369 | ||||
| Expense Example, No Redemption, 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 837 | ||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | 0.64% | ||||
| Average Annual Returns, 5 Years | rr_AverageAnnualReturnYear05 | 3.31% | ||||
| Average Annual Returns, 10 Years | rr_AverageAnnualReturnYear10 | 4.48% | ||||
| BNY Mellon Connecticut Fund | Class Z | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Maximum sales charge (load) imposed on purchases (as a percentage of offering price) | rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | none | ||||
| Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) | rr_MaximumDeferredSalesChargeOverOfferingPrice | none | ||||
| Management fees | rr_ManagementFeesOverAssets | 0.55% | ||||
| Distribution (12b-1) fees | rr_DistributionAndService12b1FeesOverAssets | none | ||||
| Shareholder services fees | rr_Component1OtherExpensesOverAssets | 0.05% | ||||
| Miscellaneous other expenses | rr_Component3OtherExpensesOverAssets | 0.15% | ||||
| Total other expenses | rr_OtherExpensesOverAssets | 0.20% | ||||
| Total annual fund operating expenses | rr_ExpensesOverAssets | 0.75% | ||||
| Fee waiver and/or expense reimbursement | rr_FeeWaiverOrReimbursementOverAssets | (0.10%) | [2] | |||
| Total annual fund operating expenses (after fee waiver and/or expenses reimbursement) | rr_NetExpensesOverAssets | 0.65% | ||||
| Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | $ 66 | ||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 230 | ||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 407 | ||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | 921 | ||||
| Expense Example, No Redemption, 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 66 | ||||
| Expense Example, No Redemption, 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 230 | ||||
| Expense Example, No Redemption, 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 407 | ||||
| Expense Example, No Redemption, 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 921 | ||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | 0.59% | ||||
| Average Annual Returns, 5 Years | rr_AverageAnnualReturnYear05 | 3.32% | ||||
| Average Annual Returns, 10 Years | rr_AverageAnnualReturnYear10 | 4.40% | ||||
| ||||||
| Label | Element | Value | ||||
|---|---|---|---|---|---|---|
| BNY Mellon Massachusetts Fund | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Risk/Return [Heading] | rr_RiskReturnHeading | Fund Summary - BNY Mellon Massachusetts Fund | ||||
| Objective [Heading] | rr_ObjectiveHeading | Investment Objective | ||||
| Objective, Primary [Text Block] | rr_ObjectivePrimaryTextBlock | The fund seeks to maximize current income exempt from federal income tax and from Massachusetts state income tax, without undue risk. |
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| 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. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or shares of other funds in the BNY Mellon Family of Funds that are subject to a sales charge. More information about sales charges, including these and other discounts and waivers, is available from your financial professional and in the Shareholder Guide section beginning on page 21 of the prospectus and in the How to Buy Shares section and the Additional Information About How to Buy Shares section beginning on page II-1 and page III-1, respectively, of the fund's Statement of Additional Information. |
||||
| 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 transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover 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 4.67% of the average value of its portfolio. |
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| Portfolio Turnover, Rate | rr_PortfolioTurnoverRate | 4.67% | ||||
| Expense Breakpoint Discounts [Text] | rr_ExpenseBreakpointDiscounts | You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or shares of other funds in the BNY Mellon Family of Funds that are subject to a sales charge. | ||||
| Expense Breakpoint, Minimum Investment Required [Amount] | rr_ExpenseBreakpointMinimumInvestmentRequiredAmount | $ 50,000 | ||||
| Expense Example [Heading] | rr_ExpenseExampleHeading | Example | ||||
| Expense Example Narrative [Text Block] | rr_ExpenseExampleNarrativeTextBlock | The 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. The one-year example and the first year of the three-, five- and ten-years examples are based on net operating expenses, restated to reflect the current expense limitation agreement by BNY Mellon Investment Adviser, Inc. Although your actual costs may be higher or lower, based on these assumptions your costs would be: |
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| Expense Example, No Redemption, By Year, Caption [Text] | rr_ExpenseExampleNoRedemptionByYearCaption | You would pay the following expenses if you did not redeem your shares: | ||||
| Strategy [Heading] | rr_StrategyHeading | Principal Investment Strategy | ||||
| Strategy Narrative [Text Block] | rr_StrategyNarrativeTextBlock | To pursue its goal, the fund normally invests at least 80% of its net assets, plus any borrowings for investment purposes, in municipal bonds that provide income exempt from federal and Massachusetts state income taxes. Municipal bonds are debt securities or other obligations issued by states, territories and possessions of the United States and the District of Columbia and their political subdivisions, agencies and instrumentalities, or multistate agencies and authorities, and certain other specified securities. The fund invests at least 70% of its assets in municipal bonds rated, at the time of purchase, investment grade (i.e., Baa/BBB or higher) or the unrated equivalent as determined by BNY Mellon Investment Adviser, Inc. For additional yield, the fund may invest up to 30% of its assets in municipal bonds rated below investment grade ("high yield" or "junk" bonds) or the unrated equivalent as determined by BNY Mellon Investment Adviser, Inc. The dollar-weighted average maturity of the fund's portfolio normally exceeds ten years, but the fund may invest without regard to maturity. A bond's maturity is the length of time until the principal must be fully repaid with interest. Dollar-weighted average maturity is an average of the stated maturities of the bonds held by the fund, based on their dollar-weighted proportions in the fund. The fund's portfolio managers focus on identifying undervalued sectors and securities. To select municipal bonds for the fund, the portfolio managers use fundamental credit analysis to estimate the relative value and attractiveness of various sectors and securities and actively trade among various sectors based on their apparent relative values. Although the fund seeks to provide income exempt from federal and Massachusetts state income taxes, income from some of the fund's holdings may be subject to the federal alternative minimum tax. |
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| Risk [Heading] | rr_RiskHeading | Principal Risks | ||||
| Risk Narrative [Text Block] | rr_RiskNarrativeTextBlock | An investment in the fund is not a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. It is not a complete investment program. The fund's share price fluctuates, sometimes dramatically, which means you could lose money. · Municipal securities risk. The amount of public information available about municipal securities is generally less than that for corporate equities or bonds. Special factors, such as legislative changes, and state and local economic and business developments, may adversely affect the yield and/or value of the fund's investments in municipal securities. Other factors include the general conditions of the municipal securities market, the size of the particular offering, the maturity of the obligation and the rating of the issue. Changes in economic, business or political conditions relating to a particular municipal project, municipality, or state, territory or possession of the United States in which the fund invests may have an impact on the fund's share price. · Interest rate risk. Prices of bonds and other fixed rate fixed-income securities tend to move inversely with changes in interest rates. Typically, a rise in rates will adversely affect fixed-income securities and, accordingly, will cause the value of the fund's investments in these securities to decline. During periods of very low interest rates, which occur from time to time due to market forces or actions of governments and/or their central banks, including the Board of Governors of the Federal Reserve System in the U.S., the fund may be subject to a greater risk of principal decline from rising interest rates. When interest rates fall, the fund's investments in new securities may be at lower yields and may reduce the fund's income. The magnitude of these fluctuations in the market price of fixed-income securities is generally greater for securities with longer effective maturities and durations because such instruments do not mature, reset interest rates or become callable for longer periods of time. Unlike investment grade bonds, however, the prices of high yield ("junk") bonds may fluctuate unpredictably and not necessarily inversely with changes in interest rates. · Credit risk. Failure of an issuer of a security to make timely interest or principal payments when due, or a decline or perception of a decline in the credit quality of the security, can cause the security's price to fall. The lower a security's credit rating, the greater the chance that the issuer of the security will default or fail to meet its payment obligations. · High yield securities risk. High yield ("junk") securities involve greater credit risk, including the risk of default, than investment grade securities, and are considered predominantly speculative with respect to the issuer's ability to make principal and interest payments. The prices of high yield securities can fall in response to bad news about the issuer or its industry, or the economy in general, to a greater extent than those of higher rated securities. · Liquidity risk. When there is little or no active trading market for specific types of securities, it can become more difficult to sell the securities in a timely manner at or near their perceived value. In such a market, the value of such securities and the fund's share price may fall dramatically. The secondary market for certain municipal bonds tends to be less well developed or liquid than many other securities markets, which may adversely affect the fund's ability to sell such municipal bonds at attractive prices. Investments that are illiquid or that trade in lower volumes may be more difficult to value. The market for below investment grade securities may be less liquid and therefore these securities may be harder to value or sell at an acceptable price, especially during times of market volatility or decline. Liquidity risk also may refer to the risk that the fund will not be able to pay redemption proceeds within the allowable time period stated in this prospectus because of unusual market conditions, an unusually high volume of redemption requests, or other reasons. To meet redemption requests, the fund may be forced to sell securities at an unfavorable time and/or under unfavorable conditions, which may adversely affect the fund's share price. · State-specific risk. The fund is subject to the risk that Massachusetts' economy, and the revenues underlying its municipal obligations, may decline. Investing primarily in the municipal obligations of a single state makes the fund more sensitive to risks specific to that state and may entail more risk than investing in the municipal obligations of multiple states as a result of potentially less diversification. · Non-diversification risk. The fund is non-diversified, which means that the fund may invest a relatively high percentage of its assets in a limited number of issuers. Therefore, the fund's performance may be more vulnerable to changes in the market value of a single issuer or group of issuers and more susceptible to risks associated with a single economic, political or regulatory occurrence than a diversified fund. · Management risk. The investment process used by the fund's portfolio managers could fail to achieve the fund's investment goal and cause your fund investment to lose value. |
||||
| Risk Lose Money [Text] | rr_RiskLoseMoney | The fund's share price fluctuates, sometimes dramatically, which means you could lose money. | ||||
| Risk Nondiversified Status [Text] | rr_RiskNondiversifiedStatus | The fund is non-diversified, which means that the fund may invest a relatively high percentage of its assets in a limited number of issuers. Therefore, the fund's performance may be more vulnerable to changes in the market value of a single issuer or group of issuers and more susceptible to risks associated with a single economic, political or regulatory occurrence than a diversified fund. | ||||
| RIsk Not Insured [Text] | rr_RiskNotInsured | An investment in the fund is not a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. | ||||
| Bar Chart and Performance Table [Heading] | rr_BarChartAndPerformanceTableHeading | Performance | ||||
| Performance Narrative [Text Block] | rr_PerformanceNarrativeTextBlock | The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the performance of the fund's Class A shares from year to year. Sales charges, if any, are not reflected in the bar chart, and, if those charges were included, returns would have been less than those shown. The table compares the average annual total returns of the fund's shares to those of a broad measure of market performance. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. More recent performance information may be available at www.bnymellonim.com/us. |
||||
| Performance Information Illustrates Variability of Returns [Text] | rr_PerformanceInformationIllustratesVariabilityOfReturns | The following bar chart and table provide some indication of the risks of investing in the fund. | ||||
| Performance Availability Website Address [Text] | rr_PerformanceAvailabilityWebSiteAddress | www.bnymellonim.com/us | ||||
| 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 | Year-by-Year Total Returns as of 12/31 each year (%) Class A | ||||
| Bar Chart Does Not Reflect Sales Loads [Text] | rr_BarChartDoesNotReflectSalesLoads | Sales charges, if any, are not reflected in the bar chart, and, if those charges were included, returns would have been less than those shown. | ||||
| Bar Chart Closing [Text Block] | rr_BarChartClosingTextBlock |
|
||||
| Year to Date Return, Label | rr_YearToDateReturnLabel | year-to-date total return | ||||
| Bar Chart, Year to Date Return, Date | rr_BarChartYearToDateReturnDate | Jun. 30, 2019 | ||||
| Bar Chart, Year to Date Return | rr_BarChartYearToDateReturn | 4.54% | ||||
| Highest Quarterly Return, Label | rr_HighestQuarterlyReturnLabel | Best Quarter | ||||
| Highest Quarterly Return, Date | rr_BarChartHighestQuarterlyReturnDate | Sep. 30, 2009 | ||||
| Highest Quarterly Return | rr_BarChartHighestQuarterlyReturn | 7.31% | ||||
| Lowest Quarterly Return, Label | rr_LowestQuarterlyReturnLabel | Worst Quarter | ||||
| Lowest Quarterly Return, Date | rr_BarChartLowestQuarterlyReturnDate | Dec. 31, 2010 | ||||
| Lowest Quarterly Return | rr_BarChartLowestQuarterlyReturn | (4.94%) | ||||
| Index No Deduction for Fees, Expenses, Taxes [Text] | rr_IndexNoDeductionForFeesExpensesTaxes | reflects no deductions for fees, expenses or taxes | ||||
| 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 | Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through U.S. tax-deferred arrangements such as 401(k) plans or individual retirement accounts. | ||||
| Performance Table One Class of after Tax Shown [Text] | rr_PerformanceTableOneClassOfAfterTaxShown | After-tax performance is shown only for Class A shares. After-tax performance of the fund's other share classes will vary. | ||||
| Performance Table Explanation after Tax Higher | rr_PerformanceTableExplanationAfterTaxHigher | Returns after taxes on distributions and sale of fund shares may be higher than returns before taxes or returns after taxes on distributions due to an assumed tax benefit from losses on a sale of the fund's shares at the end of the period. | ||||
| Performance Table Narrative | rr_PerformanceTableNarrativeTextBlock | After-tax performance is shown only for Class A shares. After-tax performance of the fund's other share classes will vary. 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 the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through U.S. tax-deferred arrangements such as 401(k) plans or individual retirement accounts. Returns after taxes on distributions and sale of fund shares may be higher than returns before taxes or returns after taxes on distributions due to an assumed tax benefit from losses on a sale of the fund's shares at the end of the period. |
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| Average Annual Return, Caption | rr_AverageAnnualReturnCaption | Average Annual Total Returns (as of 12/31/18) | ||||
| BNY Mellon Massachusetts Fund | Bloomberg Barclays U.S. Municipal Bond Index reflects no deductions for fees, expenses or taxes | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | 1.28% | ||||
| Average Annual Returns, 5 Years | rr_AverageAnnualReturnYear05 | 3.82% | ||||
| Average Annual Returns, 10 Years | rr_AverageAnnualReturnYear10 | 4.85% | ||||
| BNY Mellon Massachusetts Fund | Class A | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Maximum sales charge (load) imposed on purchases (as a percentage of offering price) | rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | 4.50% | ||||
| Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) | rr_MaximumDeferredSalesChargeOverOfferingPrice | none | [1] | |||
| Management fees | rr_ManagementFeesOverAssets | 0.55% | ||||
| Distribution (12b-1) fees | rr_DistributionAndService12b1FeesOverAssets | none | ||||
| Shareholder services fees | rr_Component1OtherExpensesOverAssets | 0.25% | ||||
| Miscellaneous other expenses | rr_Component3OtherExpensesOverAssets | 0.19% | ||||
| Total other expenses | rr_OtherExpensesOverAssets | 0.44% | ||||
| Total annual fund operating expenses | rr_ExpensesOverAssets | 0.99% | ||||
| Expenses Deferred Charges [Text Block] | rr_ExpensesDeferredChargesTextBlock | Class A shares bought without an initial sales charge as part of an investment of $1 million or more may be charged a deferred sales charge of 1.00% if redeemed within one year. | ||||
| Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | $ 546 | ||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 751 | ||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 972 | ||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | 1,608 | ||||
| Expense Example, No Redemption, 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 546 | ||||
| Expense Example, No Redemption, 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 751 | ||||
| Expense Example, No Redemption, 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 972 | ||||
| Expense Example, No Redemption, 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 1,608 | ||||
| Annual Return 2009 | rr_AnnualReturn2009 | 14.42% | ||||
| Annual Return 2010 | rr_AnnualReturn2010 | 1.16% | ||||
| Annual Return 2011 | rr_AnnualReturn2011 | 10.85% | ||||
| Annual Return 2012 | rr_AnnualReturn2012 | 6.72% | ||||
| Annual Return 2013 | rr_AnnualReturn2013 | (5.40%) | ||||
| Annual Return 2014 | rr_AnnualReturn2014 | 9.23% | ||||
| Annual Return 2015 | rr_AnnualReturn2015 | 2.96% | ||||
| Annual Return 2016 | rr_AnnualReturn2016 | (1.13%) | ||||
| Annual Return 2017 | rr_AnnualReturn2017 | 4.62% | ||||
| Annual Return 2018 | rr_AnnualReturn2018 | (0.12%) | ||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | (4.64%) | ||||
| Average Annual Returns, 5 Years | rr_AverageAnnualReturnYear05 | 2.11% | ||||
| Average Annual Returns, 10 Years | rr_AverageAnnualReturnYear10 | 3.69% | ||||
| BNY Mellon Massachusetts Fund | Class A | After Taxes on Distributions | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | (4.64%) | ||||
| Average Annual Returns, 5 Years | rr_AverageAnnualReturnYear05 | 2.10% | ||||
| Average Annual Returns, 10 Years | rr_AverageAnnualReturnYear10 | 3.67% | ||||
| BNY Mellon Massachusetts Fund | Class A | After Taxes on Distributions and Sale of Fund Shares | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | (1.78%) | ||||
| Average Annual Returns, 5 Years | rr_AverageAnnualReturnYear05 | 2.23% | ||||
| Average Annual Returns, 10 Years | rr_AverageAnnualReturnYear10 | 3.61% | ||||
| BNY Mellon Massachusetts Fund | Class C | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Maximum sales charge (load) imposed on purchases (as a percentage of offering price) | rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | none | ||||
| Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) | rr_MaximumDeferredSalesChargeOverOfferingPrice | 1.00% | ||||
| Management fees | rr_ManagementFeesOverAssets | 0.55% | ||||
| Distribution (12b-1) fees | rr_DistributionAndService12b1FeesOverAssets | 0.75% | ||||
| Shareholder services fees | rr_Component1OtherExpensesOverAssets | 0.25% | ||||
| Miscellaneous other expenses | rr_Component3OtherExpensesOverAssets | 0.38% | ||||
| Total other expenses | rr_OtherExpensesOverAssets | 0.63% | ||||
| Total annual fund operating expenses | rr_ExpensesOverAssets | 1.93% | ||||
| Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | $ 296 | ||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 606 | ||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 1,042 | ||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | 2,254 | ||||
| Expense Example, No Redemption, 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 196 | ||||
| Expense Example, No Redemption, 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 606 | ||||
| Expense Example, No Redemption, 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 1,042 | ||||
| Expense Example, No Redemption, 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 2,254 | ||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | (1.94%) | ||||
| Average Annual Returns, 5 Years | rr_AverageAnnualReturnYear05 | 2.21% | ||||
| Average Annual Returns, 10 Years | rr_AverageAnnualReturnYear10 | 3.36% | ||||
| BNY Mellon Massachusetts Fund | Class Z | ||||||
| Risk/Return: | rr_RiskReturnAbstract | |||||
| Maximum sales charge (load) imposed on purchases (as a percentage of offering price) | rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | none | ||||
| Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) | rr_MaximumDeferredSalesChargeOverOfferingPrice | none | ||||
| Management fees | rr_ManagementFeesOverAssets | 0.55% | ||||
| Distribution (12b-1) fees | rr_DistributionAndService12b1FeesOverAssets | none | ||||
| Shareholder services fees | rr_Component1OtherExpensesOverAssets | 0.04% | ||||
| Miscellaneous other expenses | rr_Component3OtherExpensesOverAssets | 0.17% | ||||
| Total other expenses | rr_OtherExpensesOverAssets | 0.21% | ||||
| Total annual fund operating expenses | rr_ExpensesOverAssets | 0.76% | ||||
| Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | $ 78 | ||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 243 | ||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 422 | ||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | 942 | ||||
| Expense Example, No Redemption, 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 78 | ||||
| Expense Example, No Redemption, 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 243 | ||||
| Expense Example, No Redemption, 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 422 | ||||
| Expense Example, No Redemption, 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 942 | ||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | 0.11% | ||||
| Average Annual Returns, 5 Years | rr_AverageAnnualReturnYear05 | 3.28% | ||||
| Average Annual Returns, 10 Years | rr_AverageAnnualReturnYear10 | 4.40% | ||||
| ||||||