Shareholder Report
|
6 Months Ended |
|
Dec. 31, 2025
USD ($)
Holding
|
|---|
| Shareholder Report [Line Items] |
|
| Document Type |
N-CSRS
|
| Amendment Flag |
false
|
| Registrant Name |
Federated Hermes Short-Intermediate Duration Municipal Trust
|
| Entity Central Index Key |
0000353101
|
| Entity Investment Company Type |
N-1A
|
| Document Period End Date |
Dec. 31, 2025
|
| C000024678 [Member] |
|
| Shareholder Report [Line Items] |
|
| Fund Name |
Federated Hermes Short-Intermediate Municipal Fund
|
| Class Name |
Service Shares
|
| Trading Symbol |
FSHSX
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about the Federated Hermes Short-Intermediate Municipal Fund (the “Fund”) for the period of July 1, 2025 to December 31, 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 |
| Service Shares |
$33 |
0.64% |
|
| Expenses Paid, Amount |
$ 33
|
| Expense Ratio, Percent |
0.64%
|
| Net Assets |
$ 389,083,108
|
| Holdings Count | Holding |
197
|
| Investment Company Portfolio Turnover |
14.00%
|
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
| Net Assets |
$389,083,108 |
| Number of Investments |
197 |
| Portfolio Turnover Rate |
14% |
|
| Holdings [Text Block] |
Fund Holdings Top Sectors
(% of Net Assets)
|
| C000024677 [Member] |
|
| Shareholder Report [Line Items] |
|
| Fund Name |
Federated Hermes Short-Intermediate Municipal Fund
|
| Class Name |
Institutional Shares
|
| Trading Symbol |
FSHIX
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about the Federated Hermes Short-Intermediate Municipal Fund (the “Fund”) for the period of July 1, 2025 to December 31, 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 |
$20 |
0.40% |
|
| Expenses Paid, Amount |
$ 20
|
| Expense Ratio, Percent |
0.40%
|
| Net Assets |
$ 389,083,108
|
| Holdings Count | Holding |
197
|
| Investment Company Portfolio Turnover |
14.00%
|
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
| Net Assets |
$389,083,108 |
| Number of Investments |
197 |
| Portfolio Turnover Rate |
14% |
|
| Holdings [Text Block] |
Fund Holdings Top Sectors
(% of Net Assets)
|
| C000037571 [Member] |
|
| Shareholder Report [Line Items] |
|
| Fund Name |
Federated Hermes Short-Intermediate Municipal Fund
|
| Class Name |
Class A Shares
|
| Trading Symbol |
FMTAX
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about the Federated Hermes Short-Intermediate Municipal Fund (the “Fund”) for the period of July 1, 2025 to December 31, 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 |
$33 |
0.65% |
|
| Expenses Paid, Amount |
$ 33
|
| Expense Ratio, Percent |
0.65%
|
| Net Assets |
$ 389,083,108
|
| Holdings Count | Holding |
197
|
| Investment Company Portfolio Turnover |
14.00%
|
| Additional Fund Statistics [Text Block] |
Key Fund Statistics
| Net Assets |
$389,083,108 |
| Number of Investments |
197 |
| Portfolio Turnover Rate |
14% |
|
| Holdings [Text Block] |
Fund Holdings Top Sectors
(% of Net Assets)
|
