v3.25.2
Shareholder Report
 6 Months Ended
Jun. 30, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name FEDERATED HERMES INSURANCE SERIES
Entity Central Index Key 0000912577
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2025
C000026775  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Fund for U.S. Government Securities II
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Fund for U.S. Government Securities II (the "Fund") for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
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)

Fund Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Federated Hermes Fund for U.S. Government Securities II
$39
0.78%
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.78%
AssetsNet $ 70,231,151
Holdings Count | Holding 172
InvestmentCompanyPortfolioTurnover 31.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$70,231,151
  • Number of Investments172
  • Portfolio Turnover31%
  • Portfolio Turnover (excluding purchases and sales from dollar-roll transactions)14%
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Value
Value
Non-Agency Mortgage-Backed Securities
2.6%
Asset-Backed Securities
3.7%
U.S. Government Agency Commericial Mortgage-Backed Securities
4.8%
Cash Equivalents
5.2%
U.S. Government Agency Securities
7.9%
U.S. Treasury Securities
15.0%
U.S. Government Agency Mortgage-Backed Securities
64.3%
Material Fund Change [Text Block]
C000026768  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Government Money Fund II
Class Name Service Shares
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Government Money Fund II (the "Fund") for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
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
$32
0.63%
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.63%
AssetsNet $ 77,630,557
Holdings Count | Holding 93
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$77,630,557
  • Number of Investments93
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Value
Value
U.S. Government Agency Securities
17.7%
U.S. Treasury Securities
22.7%
Repurchase Agreements
59.7%

Effective Maturity Schedule (% of Net Assets)

Group By Maturity Chart
Value
Value
181 Days or More
10.4%
91-180 Days
6.9%
31-90 Days
0.4%
8-30 Days
4.1%
1-7 Days
78.3%
Material Fund Change [Text Block]
C000026776  
Shareholder Report [Line Items]  
Fund Name Federated Hermes High Income Bond Fund II
Class Name Primary Shares
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes High Income Bond Fund II (the "Fund") for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
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
Primary Shares
$41
0.81%
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.81%
AssetsNet $ 117,743,201
Holdings Count | Holding 456
InvestmentCompanyPortfolioTurnover 12.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$117,743,201
  • Number of Investments456
  • Portfolio Turnover12%
Holdings [Text Block]

Top Index Classifications (% of Net Assets)

Group By Sector Chart
Value
Value
Automotive
3.9%
Independent Energy
4.0%
Cash Equivalents
4.5%
Gaming
4.5%
Health Care
4.8%
Building Materials
5.0%
Midstream
5.0%
Cable Satellite
5.5%
Insurance - P&C
9.2%
Technology
12.4%
Material Fund Change [Text Block]
C000026777  
Shareholder Report [Line Items]  
Fund Name Federated Hermes High Income Bond Fund II
Class Name Service Shares
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes High Income Bond Fund II (the "Fund") for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
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
$54
1.06%
Expenses Paid, Amount $ 54
Expense Ratio, Percent 1.06%
AssetsNet $ 117,743,201
Holdings Count | Holding 456
InvestmentCompanyPortfolioTurnover 12.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$117,743,201
  • Number of Investments456
  • Portfolio Turnover12%
Holdings [Text Block]

Top Index Classifications (% of Net Assets)

Group By Sector Chart
Value
Value
Automotive
3.9%
Independent Energy
4.0%
Cash Equivalents
4.5%
Gaming
4.5%
Health Care
4.8%
Building Materials
5.0%
Midstream
5.0%
Cable Satellite
5.5%
Insurance - P&C
9.2%
Technology
12.4%
Material Fund Change [Text Block]
C000026779  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Kaufmann Fund II
Class Name Primary Shares
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Kaufmann Fund II (the "Fund") for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
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
Primary Shares
$80
1.54%
Expenses Paid, Amount $ 80
Expense Ratio, Percent 1.54%
AssetsNet $ 140,076,118
Holdings Count | Holding 137
InvestmentCompanyPortfolioTurnover 11.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$140,076,118
  • Number of Investments137
  • Portfolio Turnover11%
Holdings [Text Block]

Top Sectors – Equity (% of Total Net Assets)

Group By Sector Chart
Value
Value
Energy
1.2%
Utilities
1.9%
Communication Services
2.5%
Consumer Staples
2.8%
Materials
3.0%
Real Estate
3.0%
Financials
7.9%
Consumer Discretionary
12.8%
Industrials
20.2%
Health Care
20.6%
Information Technology
21.9%
Material Fund Change [Text Block]
C000026780  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Kaufmann Fund II
Class Name Service Shares
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Kaufmann Fund II (the "Fund") for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
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
$93
1.79%
Expenses Paid, Amount $ 93
Expense Ratio, Percent 1.79%
AssetsNet $ 140,076,118
Holdings Count | Holding 137
InvestmentCompanyPortfolioTurnover 11.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$140,076,118
  • Number of Investments137
  • Portfolio Turnover11%
Holdings [Text Block]

Top Sectors – Equity (% of Total Net Assets)

Group By Sector Chart
Value
Value
Energy
1.2%
Utilities
1.9%
Communication Services
2.5%
Consumer Staples
2.8%
Materials
3.0%
Real Estate
3.0%
Financials
7.9%
Consumer Discretionary
12.8%
Industrials
20.2%
Health Care
20.6%
Information Technology
21.9%
Material Fund Change [Text Block]
C000026773  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Managed Volatility Fund II
Class Name Primary Shares
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Managed Volatility Fund II (the "Fund") for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
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
Primary Shares
$47
0.95%
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.95%
AssetsNet $ 176,493,513
Holdings Count | Holding 650
InvestmentCompanyPortfolioTurnover 35.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$176,493,513
  • Number of Investments650
  • Portfolio Turnover35%
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Value
Value
Federated Hermes Short-Intermediate Government Fund, Institutional Shares
0.0%Footnote Reference*
Foreign Governments/Agencies
0.1%
Purchased Put Options
0.1%
Emerging Markets Core Fund
0.9%
Federated Hermes High Income Bond Fund II, Class P
1.7%
Cash Equivalents
2.4%
Project and Trade Finance Core Fund
3.3%
International Equity Securities
5.4%
Domestic Equity Securities
38.2%
Domestic Fixed-Income Securities
48.9%
FootnoteDescription
Footnote*
Represents less than 0.1%.

Top Sectors - Equity (% of Equity Securities)

Group By Maturity Chart
Value
Value
Materials
3.9%
Real Estate
3.9%
Utilities
3.9%
Energy
5.4%
Communication Services
7.0%
Consumer Discretionary
7.5%
Consumer Staples
7.6%
Industrials
12.7%
Health Care
12.8%
Information Technology
14.0%
Financials
21.3%
Material Fund Change [Text Block]
C000199834  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Managed Volatility Fund II
Class Name Service Shares
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Managed Volatility Fund II (the "Fund") for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
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
$59
1.20%
Expenses Paid, Amount $ 59
Expense Ratio, Percent 1.20%
AssetsNet $ 176,493,513
Holdings Count | Holding 650
InvestmentCompanyPortfolioTurnover 35.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$176,493,513
  • Number of Investments650
  • Portfolio Turnover35%
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Value
Value
Federated Hermes Short-Intermediate Government Fund, Institutional Shares
0.0%Footnote Reference*
Foreign Governments/Agencies
0.1%
Purchased Put Options
0.1%
Emerging Markets Core Fund
0.9%
Federated Hermes High Income Bond Fund II, Class P
1.7%
Cash Equivalents
2.4%
Project and Trade Finance Core Fund
3.3%
International Equity Securities
5.4%
Domestic Equity Securities
38.2%
Domestic Fixed-Income Securities
48.9%
FootnoteDescription
Footnote*
Represents less than 0.1%.

Top Sectors - Equity (% of Equity Securities)

Group By Maturity Chart
Value
Value
Materials
3.9%
Real Estate
3.9%
Utilities
3.9%
Energy
5.4%
Communication Services
7.0%
Consumer Discretionary
7.5%
Consumer Staples
7.6%
Industrials
12.7%
Health Care
12.8%
Information Technology
14.0%
Financials
21.3%
Material Fund Change [Text Block]
C000026769  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Quality Bond Fund II
Class Name Primary Shares
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Quality Bond Fund II (the "Fund") for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
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
Primary Shares
$37
0.74%
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.74%
AssetsNet $ 134,672,708
Holdings Count | Holding 360
InvestmentCompanyPortfolioTurnover 8.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$134,672,708
  • Number of Investments360
  • Portfolio Turnover8%
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Value
Value
Mortgage-Backed Securities
0.0%Footnote Reference*
Repurchase Agreements
0.7%
Securities Lending Collateral
1.0%
U.S. Treasury Securities
2.3%
Corporate Bonds
95.9%
FootnoteDescription
Footnote*
Represents less than 0.1%.
Material Fund Change [Text Block]
C000026770  
Shareholder Report [Line Items]  
Fund Name Federated Hermes Quality Bond Fund II
Class Name Service Shares
No Trading Symbol [Flag] true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Federated Hermes Quality Bond Fund II (the "Fund") for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
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
$50
0.99%
Expenses Paid, Amount $ 50
Expense Ratio, Percent 0.99%
AssetsNet $ 134,672,708
Holdings Count | Holding 360
InvestmentCompanyPortfolioTurnover 8.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$134,672,708
  • Number of Investments360
  • Portfolio Turnover8%
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Value
Value
Mortgage-Backed Securities
0.0%Footnote Reference*
Repurchase Agreements
0.7%
Securities Lending Collateral
1.0%
U.S. Treasury Securities
2.3%
Corporate Bonds
95.9%
FootnoteDescription
Footnote*
Represents less than 0.1%.
Material Fund Change [Text Block]