Investment Strategy	Feb. 28, 2025
FRANKLIN FEDERAL INTERMEDIATE-TERM TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. Although the Fund does not have restrictions on the maturity of the securities it may buy, the Fund does maintain a dollar-weighted average portfolio maturity of six to 12 years. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund does not necessarily focus its investments in a particular state. The Fund may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN FEDERAL LIMITED-TERM TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. Although the Fund does not have restrictions on the maturity of the securities it may buy, the Fund does maintain a dollar-weighted average portfolio maturity of five years or less. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund does not necessarily focus its investments in a particular state. The Fund may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN HIGH YIELD TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's net assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund may invest in municipal securities rated in any rating category (or unrated or short-term rated securities of comparable credit quality), including defaulted securities. The Fund does not necessarily focus its investments in a particular state or territory, and will not invest more than 25% of its total assets in municipal securities of any one state or territory. The Fund may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities. When selecting securities for the Fund’s portfolio, the investment manager may consider existing market conditions, the availability of lower-rated securities, and whether the difference in yields between higher and lower-rated securities justifies the higher risk of lower-rated securities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN MASSACHUSETTS TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Massachusetts. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN NEW JERSEY TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of New Jersey. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's net assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN ALABAMA TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Alabama. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN GEORGIA TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Georgia. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN LOUISIANA TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Louisiana. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN MARYLAND TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Maryland. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN MISSOURI TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Missouri. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN NORTH CAROLINA TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of North Carolina. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN VIRGINIA TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Virginia. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN ARIZONA TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Arizona. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's net assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN COLORADO TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Colorado. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's net assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN CONNECTICUT TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Connecticut. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's net assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. The Fund is a "non-diversified" fund, which means it generally invests a greater proportion of its assets in the securities of one or more issuers and invests overall in a smaller number of issuers than a diversified fund. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN MICHIGAN TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Michigan. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN MINNESOTA TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Minnesota. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN OHIO TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Ohio. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN OREGON TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Oregon. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's net assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.
FRANKLIN PENNSYLVANIA TAX-FREE INCOME FUND
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Pennsylvania. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's net assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes. The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality). The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories. Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects. The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.
Strategy Portfolio Concentration [Text]	Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.

Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes.

Although the Fund does not have restrictions on the maturity of the securities it may buy, the Fund does maintain a dollar-weighted average portfolio maturity of six to 12 years.

The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality).

The Fund does not necessarily focus its investments in a particular state. The Fund may invest up to 35% of its total assets in municipal securities issued by U.S. territories.

Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects.

The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.

Strategy [Heading]

Principal Investment Strategies

Strategy Portfolio Concentration [Text]

Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.

Prospectus [Line Items]

Strategy Narrative [Text Block]

Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's net assets may be in

securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes.

The Fund may invest in municipal securities rated in any rating category (or unrated or short-term rated securities of comparable credit quality), including defaulted securities.

The Fund does not necessarily focus its investments in a particular state or territory, and will not invest more than 25% of its total assets in municipal securities of any one state or territory. The Fund may invest up to 35% of its total assets in municipal securities issued by U.S. territories.

Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects.

The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.

When selecting securities for the Fund’s portfolio, the investment manager may consider existing market conditions, the availability of lower-rated securities, and whether the difference in yields between higher and lower-rated securities justifies the higher risk of lower-rated securities.

Strategy [Heading]

Principal Investment Strategies

Strategy Portfolio Concentration [Text]

Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.

Prospectus [Line Items]

Strategy Narrative [Text Block]

Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of New Jersey. Although the Fund tries to invest all

of its assets in tax-free securities, it is possible that up to 20% of the Fund's net assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes.

The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality).

The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories.

Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects.

The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.

Strategy [Heading]

Principal Investment Strategies

Strategy Portfolio Concentration [Text]

Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.

Prospectus [Line Items]

Strategy Narrative [Text Block]

Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Georgia. Although the Fund tries to invest all of its

assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes.

The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality).

The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories.

Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects.

The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.

Strategy [Heading]

Principal Investment Strategies

Strategy Portfolio Concentration [Text]

Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.

Prospectus [Line Items]

Strategy Narrative [Text Block]

Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Maryland. Although the Fund tries to invest all of

its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes.

The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality).

The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories.

Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects.

The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.

Strategy [Heading]

Principal Investment Strategies

Strategy Portfolio Concentration [Text]

Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.

Prospectus [Line Items]

Strategy Narrative [Text Block]

Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of North Carolina. Although the Fund tries to invest

all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes.

The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality).

The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories.

Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects.

The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.

Strategy [Heading]

Principal Investment Strategies

Strategy Portfolio Concentration [Text]

Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.

Prospectus [Line Items]

Strategy Narrative [Text Block]

Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Arizona. Although the Fund tries to invest all of its

assets in tax-free securities, it is possible that up to 20% of the Fund's net assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes.

The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality).

The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories.

Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects.

The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.

Strategy [Heading]

Principal Investment Strategies

Strategy Portfolio Concentration [Text]

Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.

Prospectus [Line Items]

Strategy Narrative [Text Block]

Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Connecticut. Although the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's net assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes.

The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality).

The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories.

The Fund is a "non-diversified" fund, which means it generally invests a greater proportion of its assets in the securities of one or more issuers and invests overall in a smaller number of issuers than a diversified fund.

Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects.

The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.

Strategy [Heading]

Principal Investment Strategies

Strategy Portfolio Concentration [Text]

Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.

Prospectus [Line Items]

Strategy Narrative [Text Block]

Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Minnesota. Although the Fund tries to invest all of

its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes.

The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality).

The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories.

Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects.

The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.

Strategy [Heading]

Principal Investment Strategies

Strategy Portfolio Concentration [Text]

Under normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.

Prospectus [Line Items]

Strategy Narrative [Text Block]

Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest free from the personal income taxes, if any, of Oregon. Although the Fund tries to invest all of its

assets in tax-free securities, it is possible that up to 20% of the Fund's net assets may be in securities that pay interest that may be subject to the federal alternative minimum tax and in securities that pay interest subject to other federal or state income taxes.

The Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities of comparable credit quality).

The Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories.

Although the investment manager will search for investments across a large number of municipal securities that finance different types of projects, from time to time, based on economic conditions, the Fund may have significant positions in municipal securities that finance similar types of projects.

The investment manager selects securities that it believes will provide the best balance between risk and return within the Fund’s range of allowable investments and typically invests with a long-term time horizon. This means it generally holds securities in the Fund’s portfolio for income purposes, although the investment manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, individual securities are considered for purchase or sale based on various factors and considerations, including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities.

Strategy [Heading]

Principal Investment Strategies

Strategy Portfolio Concentration [Text]

Under normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest is free from federal income taxes, including the federal alternative minimum tax.