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Shareholder Report
 6 Months Ended
Sep. 30, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
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 Sep. 30, 2025
C000191101 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Municipal Bond Fund, Inc.
Class Name Institutional Shares
Trading Symbol LMBIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Municipal Bond Fund, Inc. (the “Fund”) for the period of April 1, 2025 to September 30, 2025.
Shareholder Report Annual or Semi-Annual semi-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.
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 six months?
(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 $29 0.58%
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.58%
Net Assets $ 218,843,508
Holdings Count | Holding 151
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $218,843,508
Number of Investments 151
Portfolio Turnover Rate 23%
Holdings [Text Block]
Fund Holdings
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
C000051334 [Member]  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Municipal Bond Fund, Inc.
Class Name Class F Shares
Trading Symbol LMFFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Municipal Bond Fund, Inc. (the “Fund”) for the period of April 1, 2025 to September 30, 2025.
Shareholder Report Annual or Semi-Annual semi-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.
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 six months?
(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 $42 0.83%
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.83%
Net Assets $ 218,843,508
Holdings Count | Holding 151
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $218,843,508
Number of Investments 151
Portfolio Turnover Rate 23%
Holdings [Text Block]
Fund Holdings
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
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 semi-annual shareholder report contains important information about the Federated Hermes Municipal Bond Fund, Inc. (the “Fund”) for the period of April 1, 2025 to September 30, 2025.
Shareholder Report Annual or Semi-Annual semi-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.
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 six months?
(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 $80 1.58%
Expenses Paid, Amount $ 80
Expense Ratio, Percent 1.58%
Net Assets $ 218,843,508
Holdings Count | Holding 151
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $218,843,508
Number of Investments 151
Portfolio Turnover Rate 23%
Holdings [Text Block]
Fund Holdings
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 1 Chart
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 semi-annual shareholder report contains important information about the Federated Hermes Municipal Bond Fund, Inc. (the “Fund”) for the period of April 1, 2025 to September 30, 2025.
Shareholder Report Annual or Semi-Annual semi-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.
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 six months?
(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 $42 0.83%
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.83%
Net Assets $ 218,843,508
Holdings Count | Holding 151
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
Net Assets $218,843,508
Number of Investments 151
Portfolio Turnover Rate 23%
Holdings [Text Block]
Fund Holdings
Top Sectors
(% of Net Assets)
Graphical Representation - Allocation 1 Chart