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