v3.26.1
Shareholder Report
 6 Months Ended
Jun. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
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, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
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, 2026 to June 30, 2026.
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)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as an annualized percentage of a $10,000 investment
Service Shares
$31
0.63%
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.63%
AssetsNet $ 73,657,025
Holdings Count | Holding 81
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$73,657,025
  • Number of Investments81
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
U.S. Government Agency Securities
18.8%
U.S. Treasury Securities
27.5%
Repurchase Agreements
53.7%

Effective Maturity Schedule (% of Net Assets)

Group By Maturity Chart
Table Summary
Value
Value
181 Days or More
7.9%
91-180 Days
12.0%
31-90 Days
6.5%
8-30 Days
3.5%
1-7 Days
70.1%
Material Fund Change [Text Block]
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, 2026 to June 30, 2026.
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)

Table Summary
Fund Name
Costs of a $10,000 investment
Costs paid as an annualized 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 $ 66,652,945
Holdings Count | Holding 168
InvestmentCompanyPortfolioTurnover 0.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$66,652,945
  • Number of Investments168
  • Portfolio Turnover0%
  • Portfolio Turnover (excluding purchases and sales from dollar-roll transactions)0%
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Asset-Backed Securities
1.0%
Non-Agency Mortgage-Backed Securities
2.4%
Cash Equivalents
3.0%
U.S. Government Agency Commericial Mortgage-Backed Securities
4.9%
U.S. Government Agency Securities
11.2%
U.S. Treasury Securities
14.0%
U.S. Government Agency Mortgage-Backed Securities
62.9%
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, 2026 to June 30, 2026.
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)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as an annualized percentage of a $10,000 investment
Primary Shares
$40
0.81%
Expenses Paid, Amount $ 40
Expense Ratio, Percent 0.81%
AssetsNet $ 74,434,476
Holdings Count | Holding 400
InvestmentCompanyPortfolioTurnover 14.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$74,434,476
  • Number of Investments400
  • Portfolio Turnover14%
Holdings [Text Block]

Top Index Classifications (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Automotive
3.4%
Health Care
3.6%
Packaging
3.7%
Gaming
4.2%
Cable Satellite
4.4%
Building Materials
4.5%
Chemicals
4.8%
Midstream
4.8%
Insurance - P&C
9.0%
Technology
15.7%
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, 2026 to June 30, 2026.
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)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as an annualized percentage of a $10,000 investment
Service Shares
$53
1.06%
Expenses Paid, Amount $ 53
Expense Ratio, Percent 1.06%
AssetsNet $ 74,434,476
Holdings Count | Holding 400
InvestmentCompanyPortfolioTurnover 14.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$74,434,476
  • Number of Investments400
  • Portfolio Turnover14%
Holdings [Text Block]

Top Index Classifications (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Automotive
3.4%
Health Care
3.6%
Packaging
3.7%
Gaming
4.2%
Cable Satellite
4.4%
Building Materials
4.5%
Chemicals
4.8%
Midstream
4.8%
Insurance - P&C
9.0%
Technology
15.7%
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, 2026 to June 30, 2026.
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)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as an annualized percentage of a $10,000 investment
Primary Shares
$82
1.54%
Expenses Paid, Amount $ 82
Expense Ratio, Percent 1.54%
AssetsNet $ 112,479,722
Holdings Count | Holding 140
InvestmentCompanyPortfolioTurnover 21.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$112,479,722
  • Number of Investments140
  • Portfolio Turnover21%
Holdings [Text Block]

Top Sectors (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Energy
0.5%
Real Estate
1.9%
Utilities
2.0%
Materials
2.4%
Communication Services
2.7%
Consumer Staples
2.8%
Financials
3.3%
Consumer Discretionary
6.5%
Health Care
23.2%
Information Technology
26.3%
Industrials
28.2%
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, 2026 to June 30, 2026.
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)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as an annualized percentage of a $10,000 investment
Service Shares
$96
1.79%
Expenses Paid, Amount $ 96
Expense Ratio, Percent 1.79%
AssetsNet $ 112,479,722
Holdings Count | Holding 140
InvestmentCompanyPortfolioTurnover 21.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$112,479,722
  • Number of Investments140
  • Portfolio Turnover21%
Holdings [Text Block]

Top Sectors (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Energy
0.5%
Real Estate
1.9%
Utilities
2.0%
Materials
2.4%
Communication Services
2.7%
Consumer Staples
2.8%
Financials
3.3%
Consumer Discretionary
6.5%
Health Care
23.2%
Information Technology
26.3%
Industrials
28.2%
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, 2026 to June 30, 2026.
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)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as an annualized percentage of a $10,000 investment
Primary Shares
$49
0.95%
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.95%
AssetsNet $ 182,679,840
Holdings Count | Holding 712
InvestmentCompanyPortfolioTurnover 37.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$182,679,840
  • Number of Investments712
  • Portfolio Turnover37%
Holdings [Text Block]

Top Security Types (% of Net Assets)Footnote Reference1

Group By Sector Chart
Table Summary
Value
Value
Purchased Put Options
0.1%
Bank Loan Core Fund
0.2%
Foreign Governments/Agencies
0.2%
Emerging Markets Core Fund
1.0%
Federated Hermes High Income Bond Fund II, Class P
1.6%
International Equity Securities
2.7%
Cash Equivalents
3.9%
Project and Trade Finance Core Fund
3.9%
Domestic Equity Securities
40.6%
Domestic Fixed-Income Securities
47.6%
FootnoteDescription
Footnote1
Reflects the pro rata portfolio composition of underlying affiliated investment companies (other than an affiliated money market fund) in which the Fund invested greater than 10% of its net assets as of the date specified above. Accordingly, the percentages of net assets shown in the table will differ from those presented on the Portfolio of Investments.

Top Sectors - Equity (% of Equity Securities)

Group By Maturity Chart
Table Summary
Value
Value
Materials
3.4%
Utilities
3.5%
Real Estate
3.7%
Communication Services
4.0%
Energy
4.9%
Consumer Staples
7.2%
Consumer Discretionary
10.4%
Industrials
13.0%
Health Care
13.2%
Information Technology
17.8%
Financials
18.9%
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, 2026 to June 30, 2026.
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)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as an annualized percentage of a $10,000 investment
Service Shares
$62
1.20%
Expenses Paid, Amount $ 62
Expense Ratio, Percent 1.20%
AssetsNet $ 182,679,840
Holdings Count | Holding 712
InvestmentCompanyPortfolioTurnover 37.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$182,679,840
  • Number of Investments712
  • Portfolio Turnover37%
Holdings [Text Block]

Top Security Types (% of Net Assets)Footnote Reference1

Group By Sector Chart
Table Summary
Value
Value
Purchased Put Options
0.1%
Bank Loan Core Fund
0.2%
Foreign Governments/Agencies
0.2%
Emerging Markets Core Fund
1.0%
Federated Hermes High Income Bond Fund II, Class P
1.6%
International Equity Securities
2.7%
Cash Equivalents
3.9%
Project and Trade Finance Core Fund
3.9%
Domestic Equity Securities
40.6%
Domestic Fixed-Income Securities
47.6%
FootnoteDescription
Footnote1
Reflects the pro rata portfolio composition of underlying affiliated investment companies (other than an affiliated money market fund) in which the Fund invested greater than 10% of its net assets as of the date specified above. Accordingly, the percentages of net assets shown in the table will differ from those presented on the Portfolio of Investments.

Top Sectors - Equity (% of Equity Securities)

Group By Maturity Chart
Table Summary
Value
Value
Materials
3.4%
Utilities
3.5%
Real Estate
3.7%
Communication Services
4.0%
Energy
4.9%
Consumer Staples
7.2%
Consumer Discretionary
10.4%
Industrials
13.0%
Health Care
13.2%
Information Technology
17.8%
Financials
18.9%
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, 2026 to June 30, 2026.
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)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as an annualized percentage of a $10,000 investment
Primary Shares
$37
0.74%
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.74%
AssetsNet $ 127,735,955
Holdings Count | Holding 398
InvestmentCompanyPortfolioTurnover 15.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$127,735,955
  • Number of Investments398
  • Portfolio Turnover15%
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Mortgage-Backed Securities
0.0%Footnote Reference*
Repurchase Agreements
0.7%
Securities Lending Collateral
3.6%
Corporate Bonds
98.2%
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, 2026 to June 30, 2026.
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)

Table Summary
Class Name
Costs of a $10,000 investment
Costs paid as an annualized percentage of a $10,000 investment
Service Shares
$49
0.99%
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.99%
AssetsNet $ 127,735,955
Holdings Count | Holding 398
InvestmentCompanyPortfolioTurnover 15.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

  • Net Assets$127,735,955
  • Number of Investments398
  • Portfolio Turnover15%
Holdings [Text Block]

Top Security Types (% of Net Assets)

Group By Sector Chart
Table Summary
Value
Value
Mortgage-Backed Securities
0.0%Footnote Reference*
Repurchase Agreements
0.7%
Securities Lending Collateral
3.6%
Corporate Bonds
98.2%
FootnoteDescription
Footnote*
Represents less than 0.1%.
Material Fund Change [Text Block]