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Shareholder Report
 12 Months Ended
Mar. 31, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name Federated Hermes Municipal Bond Fund, Inc.
Entity Central Index Key 0000201801
Entity Investment Company Type N-1A
Document Period End Date Mar. 31, 2026
C000191101 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes MunicipalBond Fund, Inc.
Class Name Institutional Shares
Trading Symbol LMBIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes Municipal Bond Fund, Inc. (the “Fund”) for the period of April 1, 2025 to March 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1‑800‑341‑7400, Option 4, or your financial advisor.
Material Fund Change Notice [Text Block]
This report describes changes made to or planned for the Fund since the beginning of the reporting period.
Additional Information Phone Number 1‑800‑341‑7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]
What were the Fund costs for the last year?
(Based on a hypothetical $10,000 investment)
Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Shares $59 0.58%
Expenses Paid, Amount $ 59
Expense Ratio, Percent 0.58%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The following discussion compares the performance of the Fund to the S&P Municipal Bond Index (the “Index”) to show how the Fund’s performance compares to the returns of similar investments for the reporting period. See the Average Annual Total Returns table below for the returns of the Fund and related indexes. The Fund seeks to provide for its shareholders a high level of current income which is exempt from federal regular income tax by investing at least a majority of its assets in a portfolio of investment-grade, tax-exempt securities.
Top Contributors to Performance
  • Sector allocation was a positive contributor to relative Fund performance. An overweight allocation to industrial development bonds (IDBs) and the Airport sector each contributed positively.
  • Duration management contributed positively to relative performance. The Fund had a long duration position relative to the Index during periods of falling rates.
Top Detractors from Performance
  • Yield curve management contributed negatively to relative Fund performance. An overweight allocation to bonds with maturities greater than 22 years and a corresponding underweight allocation to bonds with maturities between 2 and 10 years detracted from performance as the municipal AAA curve twist steepened during the fiscal year.
  • Credit allocation contributed negatively to relative performance. An underweight allocation to AAA-rated, AA-rated and nonrated bonds and an overweight allocation to BB-rated bonds all detracted from performance relative to the Index.
Performance Past Does Not Indicate Future [Text] Keep in mind that the Fund’s past performance is not a good predictor of how the Fund will perform in the future.
Line Graph [Table Text Block]
Fund Performance
Keep in mind that the Fund’s past performance is not a good predictor of how the Fund will perform in the future. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance: March 31, 2016 through March 31, 2026
Initial Investment of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns
1 Year 5 Years 10 Years
Institutional Shares1 3.87% 0.54% 1.91%
S&P Municipal Bond Index 4.32% 1.08% 2.25%
Morningstar Municipal National Long Funds Average 3.82% 0.42% 1.94%
1
The Fund’s Institutional Shares commenced operations on July 27, 2017. For the period prior to the commencement of operations of Institutional Shares, the performance information shown for the Fund’s Institutional Shares is for the Class A Shares. The performance of the Class A Shares has not been adjusted to reflect the expenses of the Institutional Shares, since the Institutional Shares have a lower expense ratio than the expense ratio of Class A Shares.
Performance Inception Date Jul. 27, 2017
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Updated Performance Information Location [Text Block]
Visit FederatedHermes.com/us/FundInformation and click on the link to your fund and share class for more recent performance information.
Net Assets $ 210,647,430
Holdings Count | Holding 158
Advisory Fees Paid, Amount $ 593,616
Investment Company Portfolio Turnover 37.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $210,647,430
Number of Investments 158
Portfolio Turnover 37%
Total Advisory Fees Paid $593,616
Holdings [Text Block]
Fund Holdings
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Material Fund Change [Text Block]
Material Fund Changes
Following is a summary of material changes made to or planned for the Fund since the beginning of the reporting period. For more complete and current information, you may review the Fund’s disclosure documents on its webpage at FederatedHermes.com/us/FundInformation or upon request at 1-800-341-7400, Option 4, or by contacting your financial advisor.
Effective December 31, 2025, R.J. Gallo no longer serves as portfolio manager for the Fund and Ann Ferentino has been added to the Fund’s portfolio management team.
Lee R. Cunningham II will retire on April 1, 2026. Effective upon his retirement, Mr. Cunningham will no longer serve as a portfolio manager of the Fund.
Summary of Change Legend [Text Block]
Following is a summary of material changes made to or planned for the Fund since the beginning of the reporting period. For more complete and current information, you may review the Fund’s disclosure documents on its webpage at FederatedHermes.com/us/FundInformation or upon request at 1-800-341-7400, Option 4, or by contacting your financial advisor.
Updated Prospectus Phone Number 1-800-341-7400
Updated Prospectus Web Address FederatedHermes.com/us/FundInformation
C000051334 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes MunicipalBond Fund, Inc.
Class Name Class F Shares
Trading Symbol LMFFX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes Municipal Bond Fund, Inc. (the “Fund”) for the period of April 1, 2025 to March 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1‑800‑341‑7400, Option 4, or your financial advisor.
Material Fund Change Notice [Text Block]
This report describes changes made to or planned for the Fund since the beginning of the reporting period.
Additional Information Phone Number 1‑800‑341‑7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]
What were the Fund costs for the last year?
(Based on a hypothetical $10,000 investment)
Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Class F Shares $84 0.83%
Expenses Paid, Amount $ 84
Expense Ratio, Percent 0.83%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The following discussion compares the performance of the Fund to the S&P Municipal Bond Index (the “Index”) to show how the Fund’s performance compares to the returns of similar investments for the reporting period. See the Average Annual Total Returns table below for the returns of the Fund and related indexes. The Fund seeks to provide for its shareholders a high level of current income which is exempt from federal regular income tax by investing at least a majority of its assets in a portfolio of investment-grade, tax-exempt securities.
Top Contributors to Performance
  • Sector allocation was a positive contributor to relative Fund performance. An overweight allocation to industrial development bonds (IDBs) and the Airport sector each contributed positively.
  • Duration management contributed positively to relative performance. The Fund had a long duration position relative to the Index during periods of falling rates.
Top Detractors from Performance
  • Yield curve management contributed negatively to relative Fund performance. An overweight allocation to bonds with maturities greater than 22 years and a corresponding underweight allocation to bonds with maturities between 2 and 10 years detracted from performance as the municipal AAA curve twist steepened during the fiscal year.
  • Credit allocation contributed negatively to relative performance. An underweight allocation to AAA-rated, AA-rated and nonrated bonds and an overweight allocation to BB-rated bonds all detracted from performance relative to the Index.
Performance Past Does Not Indicate Future [Text] Keep in mind that the Fund’s past performance is not a good predictor of how the Fund will perform in the future.
Line Graph [Table Text Block]
Fund Performance
Keep in mind that the Fund’s past performance is not a good predictor of how the Fund will perform in the future. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance: March 31, 2016 through March 31, 2026
Initial Investment of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns
1 Year 5 Years 10 Years
Class F Shares — including sales load 1.52% 0.08% 1.65%
Class F Shares — excluding sales load 3.60% 0.28% 1.75%
S&P Municipal Bond Index 4.32% 1.08% 2.25%
Morningstar Municipal National Long Funds Average 3.82% 0.42% 1.94%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Updated Performance Information Location [Text Block]
Visit FederatedHermes.com/us/FundInformation and click on the link to your fund and share class for more recent performance information.
Net Assets $ 210,647,430
Holdings Count | Holding 158
Advisory Fees Paid, Amount $ 593,616
Investment Company Portfolio Turnover 37.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $210,647,430
Number of Investments 158
Portfolio Turnover 37%
Total Advisory Fees Paid $593,616
Holdings [Text Block]
Fund Holdings
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Material Fund Change [Text Block]
Material Fund Changes
Following is a summary of material changes made to or planned for the Fund since the beginning of the reporting period. For more complete and current information, you may review the Fund’s disclosure documents on its webpage at FederatedHermes.com/us/FundInformation or upon request at 1-800-341-7400, Option 4, or by contacting your financial advisor.
Effective December 31, 2025, R.J. Gallo no longer serves as portfolio manager for the Fund and Ann Ferentino has been added to the Fund’s portfolio management team.
Lee R. Cunningham II will retire on April 1, 2026. Effective upon his retirement, Mr. Cunningham will no longer serve as a portfolio manager of the Fund.
On May 14, 2026, the Fund’s Board of Directors approved conversion of Class F Shares into Class A Shares of the Fund on or about August 28, 2026, resulting in the closure and termination of the Fund’s Class F Shares.
Summary of Change Legend [Text Block]
Following is a summary of material changes made to or planned for the Fund since the beginning of the reporting period. For more complete and current information, you may review the Fund’s disclosure documents on its webpage at FederatedHermes.com/us/FundInformation or upon request at 1-800-341-7400, Option 4, or by contacting your financial advisor.
Updated Prospectus Phone Number 1-800-341-7400
Updated Prospectus Web Address FederatedHermes.com/us/FundInformation
C000024644 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Municipal Bond Fund, Inc.
Class Name Class C Shares
Trading Symbol LMSCX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes Municipal Bond Fund, Inc. (the “Fund”) for the period of April 1, 2025 to March 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1‑800‑341‑7400, Option 4, or your financial advisor.
Material Fund Change Notice [Text Block]
This report describes changes made to or planned for the Fund since the beginning of the reporting period.
Additional Information Phone Number 1‑800‑341‑7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]
What were the Fund costs for the last year?
(Based on a hypothetical $10,000 investment)
Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Class C Shares $160 1.58%
Expenses Paid, Amount $ 160
Expense Ratio, Percent 1.58%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The following discussion compares the performance of the Fund to the S&P Municipal Bond Index (the “Index”) to show how the Fund’s performance compares to the returns of similar investments for the reporting period. See the Average Annual Total Returns table below for the returns of the Fund and related indexes. The Fund seeks to provide for its shareholders a high level of current income which is exempt from federal regular income tax by investing at least a majority of its assets in a portfolio of investment-grade, tax-exempt securities.
Top Contributors to Performance
  • Sector allocation was a positive contributor to relative Fund performance. An overweight allocation to industrial development bonds (IDBs) and the Airport sector each contributed positively.
  • Duration management contributed positively to relative performance. The Fund had a long duration position relative to the Index during periods of falling rates.
Top Detractors from Performance
  • Yield curve management contributed negatively to relative Fund performance. An overweight allocation to bonds with maturities greater than 22 years and a corresponding underweight allocation to bonds with maturities between 2 and 10 years detracted from performance as the municipal AAA curve twist steepened during the fiscal year.
  • Credit allocation contributed negatively to relative performance. An underweight allocation to AAA-rated, AA-rated and nonrated bonds and an overweight allocation to BB-rated bonds all detracted from performance relative to the Index.
Performance Past Does Not Indicate Future [Text] Keep in mind that the Fund’s past performance is not a good predictor of how the Fund will perform in the future.
Line Graph [Table Text Block]
Fund Performance
Keep in mind that the Fund’s past performance is not a good predictor of how the Fund will perform in the future. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance: March 31, 2016 through March 31, 2026
Initial Investment of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns
1 Year 5 Years 10 Years
Class C Shares — including sales load 1.81% -0.47% 1.13%
Class C Shares — excluding sales load 2.81% -0.47% 1.13%
S&P Municipal Bond Index 4.32% 1.08% 2.25%
Morningstar Municipal National Long Funds Average 3.82% 0.42% 1.94%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Updated Performance Information Location [Text Block]
Visit FederatedHermes.com/us/FundInformation and click on the link to your fund and share class for more recent performance information.
Net Assets $ 210,647,430
Holdings Count | Holding 158
Advisory Fees Paid, Amount $ 593,616
Investment Company Portfolio Turnover 37.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $210,647,430
Number of Investments 158
Portfolio Turnover 37%
Total Advisory Fees Paid $593,616
Holdings [Text Block]
Fund Holdings
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Material Fund Change [Text Block]
Material Fund Changes
Following is a summary of material changes made to or planned for the Fund since the beginning of the reporting period. For more complete and current information, you may review the Fund’s disclosure documents on its webpage at FederatedHermes.com/us/FundInformation or upon request at 1-800-341-7400, Option 4, or by contacting your financial advisor.
Effective December 31, 2025, R.J. Gallo no longer serves as portfolio manager for the Fund and Ann Ferentino has been added to the Fund’s portfolio management team.
Lee R. Cunningham II will retire on April 1, 2026. Effective upon his retirement, Mr. Cunningham will no longer serve as a portfolio manager of the Fund.
Summary of Change Legend [Text Block]
Following is a summary of material changes made to or planned for the Fund since the beginning of the reporting period. For more complete and current information, you may review the Fund’s disclosure documents on its webpage at FederatedHermes.com/us/FundInformation or upon request at 1-800-341-7400, Option 4, or by contacting your financial advisor.
Updated Prospectus Phone Number 1-800-341-7400
Updated Prospectus Web Address FederatedHermes.com/us/FundInformation
C000024642 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Municipal Bond Fund, Inc.
Class Name Class A Shares
Trading Symbol LMSFX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Federated Hermes Municipal Bond Fund, Inc. (the “Fund”) for the period of April 1, 2025 to March 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at FederatedHermes.com/us/FundInformation. You can also request this information by contacting us at 1‑800‑341‑7400, Option 4, or your financial advisor.
Material Fund Change Notice [Text Block]
This report describes changes made to or planned for the Fund since the beginning of the reporting period.
Additional Information Phone Number 1‑800‑341‑7400
Additional Information Website FederatedHermes.com/us/FundInformation
Expenses [Text Block]
What were the Fund costs for the last year?
(Based on a hypothetical $10,000 investment)
Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Class A Shares $84 0.83%
Expenses Paid, Amount $ 84
Expense Ratio, Percent 0.83%
Factors Affecting Performance [Text Block]
Management's Discussion of Fund Performance
The following discussion compares the performance of the Fund to the S&P Municipal Bond Index (the “Index”) to show how the Fund’s performance compares to the returns of similar investments for the reporting period. See the Average Annual Total Returns table below for the returns of the Fund and related indexes. The Fund seeks to provide for its shareholders a high level of current income which is exempt from federal regular income tax by investing at least a majority of its assets in a portfolio of investment-grade, tax-exempt securities.
Top Contributors to Performance
  • Sector allocation was a positive contributor to relative Fund performance. An overweight allocation to industrial development bonds (IDBs) and the Airport sector each contributed positively.
  • Duration management contributed positively to relative performance. The Fund had a long duration position relative to the Index during periods of falling rates.
Top Detractors from Performance
  • Yield curve management contributed negatively to relative Fund performance. An overweight allocation to bonds with maturities greater than 22 years and a corresponding underweight allocation to bonds with maturities between 2 and 10 years detracted from performance as the municipal AAA curve twist steepened during the fiscal year.
  • Credit allocation contributed negatively to relative performance. An underweight allocation to AAA-rated, AA-rated and nonrated bonds and an overweight allocation to BB-rated bonds all detracted from performance relative to the Index.
Performance Past Does Not Indicate Future [Text] Keep in mind that the Fund’s past performance is not a good predictor of how the Fund will perform in the future.
Line Graph [Table Text Block]
Fund Performance
Keep in mind that the Fund’s past performance is not a good predictor of how the Fund will perform in the future. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Cumulative Performance: March 31, 2016 through March 31, 2026
Initial Investment of $10,000
Fund Performance - Growth of 10K
Average Annual Return [Table Text Block]
Average Annual Total Returns
1 Year 5 Years 10 Years
Class A Shares — including sales load -1.13% -0.64% 1.29%
Class A Shares — excluding sales load 3.49% 0.28% 1.75%
S&P Municipal Bond Index 4.32% 1.08% 2.25%
Morningstar Municipal National Long Funds Average 3.82% 0.42% 1.94%
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares.
Updated Performance Information Location [Text Block]
Visit FederatedHermes.com/us/FundInformation and click on the link to your fund and share class for more recent performance information.
Net Assets $ 210,647,430
Holdings Count | Holding 158
Advisory Fees Paid, Amount $ 593,616
Investment Company Portfolio Turnover 37.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $210,647,430
Number of Investments 158
Portfolio Turnover 37%
Total Advisory Fees Paid $593,616
Holdings [Text Block]
Fund Holdings
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
Material Fund Change [Text Block]
Material Fund Changes
Following is a summary of material changes made to or planned for the Fund since the beginning of the reporting period. For more complete and current information, you may review the Fund’s disclosure documents on its webpage at FederatedHermes.com/us/FundInformation or upon request at 1-800-341-7400, Option 4, or by contacting your financial advisor.
Effective December 31, 2025, R.J. Gallo no longer serves as portfolio manager for the Fund and Ann Ferentino has been added to the Fund’s portfolio management team.
Lee R. Cunningham II will retire on April 1, 2026. Effective upon his retirement, Mr. Cunningham will no longer serve as a portfolio manager of the Fund.
Summary of Change Legend [Text Block]
Following is a summary of material changes made to or planned for the Fund since the beginning of the reporting period. For more complete and current information, you may review the Fund’s disclosure documents on its webpage at FederatedHermes.com/us/FundInformation or upon request at 1-800-341-7400, Option 4, or by contacting your financial advisor.
Updated Prospectus Phone Number 1-800-341-7400
Updated Prospectus Web Address FederatedHermes.com/us/FundInformation