Form N-CSR Cover
| Form N-CSR Cover | 6 Months Ended |
| Jul. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Federated Hermes Short-Intermediate Government Trust |
| Entity Central Index Key | 0000357159 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jul. 31, 2024 |
Shareholder Report
| Shareholder Report | 6 Months Ended |
| Jul. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Federated Hermes Short-Intermediate Government Trust |
| Entity Central Index Key | 0000357159 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jul. 31, 2024 |
| C000024572 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes Short-Intermediate Government Fund |
| Class Name | Institutional Shares |
| Trading Symbol | FIGTX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes Short-Intermediate Government Fund (the "Fund") for the period of February 1, 2024 to July 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information at www.FederatedHermes.com/us/FundInformation |
| Additional Information Phone Number | 1-800-341-7400 |
| Additional Information Website | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.FederatedHermes.com/us/FundInformation</span></span>" id="sjs-B19"><span style="text-decoration: underline solid rgb(0, 0, 0); box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.FederatedHermes.com/us/FundInformation</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Shares $30 0.59% |
| Expenses Paid, Amount | $ 30 |
| Expense Ratio, Percent | 0.59% |
| AssetsNet | $ 101,430,414 |
| Holdings Count | Holding | 35 |
| InvestmentCompanyPortfolioTurnover | 40% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $101,430,414 Number of Investments 35 Portfolio Turnover 40% |
| Holdings [Text Block] | Top Security Types (% of Net Assets) Value Value Derivative Contracts 0.3% Cash Equivalents 2.6% Collateralized Mortgage Obligations 7.7% U.S. Government Agency Securities 7.9% Mortgage-Backed Securities 19.4% U.S. Treasury Securities 61.6% |
| Material Fund Change [Text Block] | |
| C000024571 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes Short-Intermediate Government Fund |
| Class Name | Class R Shares |
| Trading Symbol | FIGKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes Short-Intermediate Government Fund (the "Fund") for the period of February 1, 2024 to July 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information at www.FederatedHermes.com/us/FundInformation |
| Additional Information Phone Number | 1-800-341-7400 |
| Additional Information Website | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.FederatedHermes.com/us/FundInformation</span></span>" id="sjs-B38"><span style="text-decoration: underline solid rgb(0, 0, 0); box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.FederatedHermes.com/us/FundInformation</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class R Shares $66 1.32% |
| Expenses Paid, Amount | $ 66 |
| Expense Ratio, Percent | 1.32% |
| AssetsNet | $ 101,430,414 |
| Holdings Count | Holding | 35 |
| InvestmentCompanyPortfolioTurnover | 40% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $101,430,414 Number of Investments 35 Portfolio Turnover 40% |
| Holdings [Text Block] | Top Security Types (% of Net Assets) Value Value Derivative Contracts 0.3% Cash Equivalents 2.6% Collateralized Mortgage Obligations 7.7% U.S. Government Agency Securities 7.9% Mortgage-Backed Securities 19.4% U.S. Treasury Securities 61.6% |
| Material Fund Change [Text Block] | |
| C000024573 | |
| Shareholder Report [Line Items] | |
| Fund Name | Federated Hermes Short-Intermediate Government Fund |
| Class Name | Service Shares |
| Trading Symbol | FIGIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Federated Hermes Short-Intermediate Government Fund (the "Fund") for the period of February 1, 2024 to July 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information at www.FederatedHermes.com/us/FundInformation |
| Additional Information Phone Number | 1-800-341-7400 |
| Additional Information Website | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.FederatedHermes.com/us/FundInformation</span></span>" id="sjs-B57"><span style="text-decoration: underline solid rgb(0, 0, 0); box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">www.FederatedHermes.com/us/FundInformation</span></span> |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Service Shares $41 0.82% |
| Expenses Paid, Amount | $ 41 |
| Expense Ratio, Percent | 0.82% |
| AssetsNet | $ 101,430,414 |
| Holdings Count | Holding | 35 |
| InvestmentCompanyPortfolioTurnover | 40% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $101,430,414 Number of Investments 35 Portfolio Turnover 40% |
| Holdings [Text Block] | Top Security Types (% of Net Assets) Value Value Derivative Contracts 0.3% Cash Equivalents 2.6% Collateralized Mortgage Obligations 7.7% U.S. Government Agency Securities 7.9% Mortgage-Backed Securities 19.4% U.S. Treasury Securities 61.6% |
| Material Fund Change [Text Block] |
Shareholder Report, Holdings (D
| Shareholder Report, Holdings (Details) | Jul. 31, 2024 |
| C000024572 | Cash Equivalent | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000024572 | Greater than 5 Years | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.60% |
| C000024572 | 2-5 Years | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 64.10% |
| C000024572 | Less than 2 Years | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| C000024572 | Derivative Contracts | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000024572 | Cash Equivalents | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000024572 | Collateralized Mortgage Obligations | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.70% |
| C000024572 | U.S. Government Agency Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| C000024572 | Mortgage-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.40% |
| C000024572 | U.S. Treasury Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.60% |
| C000024571 | Cash Equivalent | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000024571 | Greater than 5 Years | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.60% |
| C000024571 | 2-5 Years | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 64.10% |
| C000024571 | Less than 2 Years | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| C000024571 | Derivative Contracts | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000024571 | Cash Equivalents | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000024571 | Collateralized Mortgage Obligations | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.70% |
| C000024571 | U.S. Government Agency Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| C000024571 | Mortgage-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.40% |
| C000024571 | U.S. Treasury Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.60% |
| C000024573 | Cash Equivalent | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000024573 | Greater than 5 Years | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.60% |
| C000024573 | 2-5 Years | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 64.10% |
| C000024573 | Less than 2 Years | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| C000024573 | Derivative Contracts | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000024573 | Cash Equivalents | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000024573 | Collateralized Mortgage Obligations | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.70% |
| C000024573 | U.S. Government Agency Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| C000024573 | Mortgage-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.40% |
| C000024573 | U.S. Treasury Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.60% |