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Shareholder Report
 6 Months Ended
Nov. 30, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Federated Hermes Institutional Trust
Entity Central Index Key 0000925723
Entity Investment Company Type N-1A
Document Period End Date Nov. 30, 2025
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000026761  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Government Ultrashort Fund
Class Name Class A Shares
Trading Symbol FGUAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Government Ultrashort Fund (the "Fund") for the period of June 1, 2025 to November 30, 2025.
Additional Information [Text Block] You can find additional information 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
$21
0.41%
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.41%
AssetsNet $ 2,166,385,765
Holdings Count | Holding 254
InvestmentCompanyPortfolioTurnover 10.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$2,166,385,765
  • Number of Investments254
  • Portfolio Turnover10%
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Value
Value
U.S. Government Agency Securities
1.0%
U.S. Government Agency Commericial Mortgage-Backed Securities
5.8%
U.S. Treasury Securities
7.7%
Repurchase Agreements
29.3%
U.S. Government Agency Mortgage-Backed Securities
56.6%
Material Fund Change [Text Block]
C000026763  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Government Ultrashort Fund
Class Name Institutional Shares
Trading Symbol FGUSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Government Ultrashort Fund (the "Fund") for the period of June 1, 2025 to November 30, 2025.
Additional Information [Text Block] You can find additional information 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
$13
0.26%
Expenses Paid, Amount $ 13
Expense Ratio, Percent 0.26%
AssetsNet $ 2,166,385,765
Holdings Count | Holding 254
InvestmentCompanyPortfolioTurnover 10.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$2,166,385,765
  • Number of Investments254
  • Portfolio Turnover10%
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Value
Value
U.S. Government Agency Securities
1.0%
U.S. Government Agency Commericial Mortgage-Backed Securities
5.8%
U.S. Treasury Securities
7.7%
Repurchase Agreements
29.3%
U.S. Government Agency Mortgage-Backed Securities
56.6%
Material Fund Change [Text Block]
C000168177  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Government Ultrashort Fund
Class Name Class R6 Shares
Trading Symbol FGULX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Government Ultrashort Fund (the "Fund") for the period of June 1, 2025 to November 30, 2025.
Additional Information [Text Block] You can find additional information 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 R6 Shares
$12
0.24%
Expenses Paid, Amount $ 12
Expense Ratio, Percent 0.24%
AssetsNet $ 2,166,385,765
Holdings Count | Holding 254
InvestmentCompanyPortfolioTurnover 10.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$2,166,385,765
  • Number of Investments254
  • Portfolio Turnover10%
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Value
Value
U.S. Government Agency Securities
1.0%
U.S. Government Agency Commericial Mortgage-Backed Securities
5.8%
U.S. Treasury Securities
7.7%
Repurchase Agreements
29.3%
U.S. Government Agency Mortgage-Backed Securities
56.6%
Material Fund Change [Text Block]
C000026762  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Government Ultrashort Fund
Class Name Service Shares
Trading Symbol FEUSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Government Ultrashort Fund (the "Fund") for the period of June 1, 2025 to November 30, 2025.
Additional Information [Text Block] You can find additional information 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
$18
0.36%
Expenses Paid, Amount $ 18
Expense Ratio, Percent 0.36%
AssetsNet $ 2,166,385,765
Holdings Count | Holding 254
InvestmentCompanyPortfolioTurnover 10.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$2,166,385,765
  • Number of Investments254
  • Portfolio Turnover10%
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Value
Value
U.S. Government Agency Securities
1.0%
U.S. Government Agency Commericial Mortgage-Backed Securities
5.8%
U.S. Treasury Securities
7.7%
Repurchase Agreements
29.3%
U.S. Government Agency Mortgage-Backed Securities
56.6%
Material Fund Change [Text Block]