v3.26.1
Schedule of Assets (Held at End of Year) - Schedule of Assets (Held at End of Year) (Details) - EBP 003
12 Months Ended
Dec. 31, 2025
USD ($)
EBP, Schedule of Asset Held for Investment [Line Items]  
Entity Tax Identification Number 46-0458824
EBP, Plan Number 003
EBP, Plan Name 401(k) RETIREMENT SAVINGS PLAN
EBP, Asset Held for Investment, Party-in-Interest [true false] true
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Participant loans, Current Value $ 10,131,620
Participant loans, maturity date Aug. 29, 2038
Total Current Value $ 921,928,879
Investment, Identifier [Axis]: Cash  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 8,706
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Common stock  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 17,572,606
EBP, Asset Held for Investment, Party-in-Interest [true false] true
EBP, Investment, Issuer Name [Extensible Enumeration] Black Hills Corporation1 [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Common Stock [Member]
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Invesco Stable Value CL B1  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 23,328,232
EBP, Investment, Issuer Name [Extensible Enumeration] Invesco Stable Value CL B1 [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Common Collective Trust Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Schwab U.S. Treasury Money Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 2,784
EBP, Asset Held for Investment, Party-in-Interest [true false] true
EBP, Investment, Issuer Name [Extensible Enumeration] Schwab U.S. Treasury Money Fund [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Self-directed brokerage accounts - PCRA  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 39,467,717
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Extended Market Index Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 53,748,185
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Extended Market Index Fund [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Inflation-Protected Securities Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 14,368,445
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Inflation-Protected Securities Fund [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Institutional Index Plus Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 143,477,881
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Institutional Index Plus Fund [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard REIT Index Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 7,378,314
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard REIT Index Fund [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Target Retirement 2020 Fund TR I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 15,903,947
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Target Retirement 2020 Fund TR I [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Common Collective Trust Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Target Retirement 2025 Fund TR I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 46,723,056
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Target Retirement 2025 Fund TR I [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Common Collective Trust Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Target Retirement 2030 Fund TR I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 68,627,743
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Target Retirement 2030 Fund TR I [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Common Collective Trust Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Target Retirement 2035 Fund TR I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 84,224,389
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Target Retirement 2035 Fund TR I [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Common Collective Trust Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Target Retirement 2040 Fund TR I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 78,495,628
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Target Retirement 2040 Fund TR I [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Common Collective Trust Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Target Retirement 2045 Fund TR I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 98,867,501
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Target Retirement 2045 Fund TR I [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Common Collective Trust Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Target Retirement 2050 Fund TR I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 64,126,931
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Target Retirement 2050 Fund TR I [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Common Collective Trust Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Target Retirement 2055 Fund TR I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 45,241,065
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Target Retirement 2055 Fund TR I [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Common Collective Trust Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Target Retirement 2060 Fund TR I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 21,288,939
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Target Retirement 2060 Fund TR I [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Common Collective Trust Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Target Retirement 2065 Fund TR I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 4,439,356
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Target Retirement 2065 Fund TR I [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Common Collective Trust Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Target Retirement 2070 Fund TR I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 700,592
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Target Retirement 2070 Fund TR I [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Common Collective Trust Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Target Retirement Income Fund TR I  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 5,866,433
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Target Retirement Income Fund TR I [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Common Collective Trust Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Total Bond Market Index Fund  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 31,649,191
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Total Bond Market Index Fund [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Investment, Identifier [Axis]: Vanguard Total International Stock Index  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 46,289,618
EBP, Investment, Issuer Name [Extensible Enumeration] Vanguard Total International Stock Index [Member]
EBP, Investment, Current Value, Type [Extensible Enumeration] Mutual Funds
EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
Minimum  
EBP, Schedule of Asset Held for Investment [Line Items]  
Participant loans, interest rates 4.25%
Maximum  
EBP, Schedule of Asset Held for Investment [Line Items]  
Participant loans, interest rates 9.50%
Common Collective Trust Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 557,833,812
Mutual Funds  
EBP, Schedule of Asset Held for Investment [Line Items]  
Current Value $ 296,914,418