v3.26.1
INVESTMENTS - STRS JVs individual Investments (Details)
€ in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2026
EUR (€)
Dec. 31, 2024
USD ($)
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 594,296 $ 607,574    
Investment Owned, at Fair Value $ 569,202 $ 578,649    
Investment, Interest Rate, Paid in Kind 12.39%   12.39%  
Percent of net assets 225.10% 222.70% 225.10%  
Total investments and money market funds amortized cost $ 617,260 $ 628,622    
Total investments and money market funds fair value $ 592,166 $ 599,697    
Total investments and money market funds percentage 234.20% 230.80% 234.20%  
STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 339,859 $ 323,601    
Investments owned non-accrual status 0 0    
Investment Owned, at Fair Value $ 340,272 $ 323,552    
Fair Value As A Percentage of Member's Equity 1000.00% 984.30%    
Percent of net assets 1000.00% 984.30% 1000.00%  
Total investments and money market funds amortized cost $ 341,952 $ 329,483    
Total investments and money market funds fair value $ 342,365 $ 329,434    
Total investments and money market funds percentage 1006.20% 1002.20% 1006.20%  
Secured Overnight Financing Rate (SOFR) One Month Term [Member]        
Schedule of Investments [Line Items]        
Rate of interest on investment per duration period 3.70% 3.70%    
Secured Overnight Financing Rate (SOFR) Three Month Term [Member]        
Schedule of Investments [Line Items]        
Rate of interest on investment per duration period 3.70% 3.70%    
Secured Overnight Financing Rate (SOFR) Six Month Term [Member]        
Schedule of Investments [Line Items]        
Rate of interest on investment per duration period 3.80% 3.60%    
Prime Rate [Member]        
Schedule of Investments [Line Items]        
Rate of interest on investment per duration period 6.80% 6.80%    
Canadian Overnight Repo Rate Average        
Schedule of Investments [Line Items]        
Rate of interest on investment per duration period 2.30%      
Canadian Dollar Offered Rate Three Month Term [Member]        
Schedule of Investments [Line Items]        
Rate of interest on investment per duration period   2.30%    
Euro Interbank Offered Rate One Month Term [Member]        
Schedule of Investments [Line Items]        
Rate of interest on investment per duration period 2.20% 1.90%    
Euro Interbank Offered Rate Three Month Term [Member]        
Schedule of Investments [Line Items]        
Rate of interest on investment per duration period 2.30% 2.00%    
Euro Interbank Offered Rate Six Month Term [Member]        
Schedule of Investments [Line Items]        
Rate of interest on investment per duration period 2.60% 2.10%    
SONIA        
Schedule of Investments [Line Items]        
Rate of interest on investment per duration period 3.70% 3.70%    
Investment, Identifier [Axis]: AB Centers Acquisition Corporation First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:AbCentersAcquisitionCorporationMember whfcl:AbCentersAcquisitionCorporationMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 5.25% 5.25% 5.25%  
Investment Interest Rate 8.89% 8.97% 8.89%  
Investment, Acquisition Date Sep. 19, 2024 Sep. 19, 2024    
Investment Maturity Date Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031  
Investment Owned, Balance, Principal Amount $ 559 $ 408    
Investment Owned, at Cost 554 405    
Investment Owned, at Fair Value $ 564 $ 409    
Fair Value As A Percentage of Member's Equity 1.70% 1.20%    
Investment, Identifier [Axis]: AB Centers Acquisition Corporation First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:AbCentersAcquisitionCorporationMember whfcl:AbCentersAcquisitionCorporationMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 5.25% 5.25% 5.25%  
Investment Interest Rate 8.89% 8.97% 8.89%  
Investment, Acquisition Date Sep. 19, 2024 Sep. 19, 2024    
Investment Maturity Date Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031  
Investment Owned, at Fair Value $ 8 $ 5    
Investment, Identifier [Axis]: AB Centers Acquisition Corporation First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:AbCentersAcquisitionCorporationMember whfcl:AbCentersAcquisitionCorporationMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 5.25% 5.25% 5.25%  
Investment Interest Rate 8.89% 8.97% 8.89%  
Investment, Acquisition Date Sep. 19, 2024 Sep. 19, 2024    
Investment Maturity Date Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031  
Investment Owned, Balance, Principal Amount $ 12,976 $ 13,039    
Investment Owned, at Cost 12,870 12,922    
Investment Owned, at Fair Value $ 12,976 $ 12,973    
Fair Value As A Percentage of Member's Equity 38.10% 39.50%    
Investment, Identifier [Axis]: ABB/Con-cise Optical Group LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ABBCon-ciseOpticalGroupLLCMember whfcl:ABBCon-ciseOpticalGroupLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Supplies Health Care Supplies Health Care Supplies  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 7.50% 7.50% 7.50%  
Investment Interest Rate 11.39% 11.34% 11.39%  
Investment, Acquisition Date Feb. 23, 2022 Feb. 23, 2022    
Investment Maturity Date Feb. 23, 2028 Feb. 23, 2028 Feb. 23, 2028  
Investment Owned, Balance, Principal Amount $ 20,409 $ 20,409    
Investment Owned, at Cost 20,269 20,227    
Investment Owned, at Fair Value $ 20,409 $ 20,026    
Percent of net assets 8.10% 7.70% 8.10%  
Investment, Identifier [Axis]: APG Lions Purchaser, LLC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:ApgLionsPurchaserLlcMember    
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Distributors    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]    
Investment, Interest Rate, Floor   1.00%    
Spread Above Index   5.50%    
Investment Interest Rate   9.39%    
Investment, Acquisition Date   Apr. 26, 2024    
Investment Maturity Date   Apr. 16, 2030    
Investment Owned, at Fair Value   $ 15    
Investment, Identifier [Axis]: APG Lions Purchaser, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ApgLionsPurchaserLlcMember whfcl:ApgLionsPurchaserLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.18% 9.39% 9.18%  
Investment, Acquisition Date Apr. 26, 2024 Apr. 26, 2024    
Investment Maturity Date Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030  
Investment Owned, at Fair Value $ 5 $ 6    
Investment, Identifier [Axis]: APG Lions Purchaser, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ApgLionsPurchaserLlcMember whfcl:ApgLionsPurchaserLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.18% 9.39% 9.18%  
Investment, Acquisition Date Apr. 26, 2024 Apr. 26, 2024    
Investment Maturity Date Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030  
Investment Owned, Balance, Principal Amount $ 4,008 $ 4,046    
Investment Owned, at Cost 3,970 4,002    
Investment Owned, at Fair Value $ 4,008 $ 4,046    
Fair Value As A Percentage of Member's Equity 11.80% 12.30%    
Investment, Identifier [Axis]: American Crafts Holdings, LLC, Warrants        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsHoldingsLlcMember    
Investment, Type [Extensible Enumeration]   Warrant [Member]    
Investment, Identifier [Axis]: American Crafts Lc Super Priority First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember    
Investment, Type [Extensible Enumeration]   whfcl:SuperPriorityFirstLienSecuredTermLoanMember    
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember    
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember    
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]    
Investment, Identifier [Axis]: American Crafts, LC Priority First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember    
Investment, Type [Extensible Enumeration]   whfcl:PriorityFirstLienSecuredLoanMember    
Investment, Identifier [Axis]: American Crafts, LC Super Senior Priority First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember    
Investment, Type [Extensible Enumeration]   whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember    
Investment Owned, at Fair Value       $ 373
Investment, Identifier [Axis]: American Crafts, LC Super Senior Priority First Lien Secured Term Loan one        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember    
Investment, Type [Extensible Enumeration]   whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanOneMember    
Investment, Identifier [Axis]: Apollon Holdings, LLC (d/b/a Apollon Wealth Management, LLC) First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ApollonHoldingsLlcMember whfcl:ApollonHoldingsLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Asset Management & Custody Banks Asset Management & Custody Banks Asset Management & Custody Banks  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.17% 9.33% 9.17%  
Investment, Acquisition Date Jul. 21, 2025 Jul. 21, 2025    
Investment Maturity Date Jun. 18, 2032 Jun. 18, 2032 Jun. 18, 2032  
Investment Owned, Balance, Principal Amount $ 4,849 $ 2,372    
Investment Owned, at Cost 4,787 2,339    
Investment Owned, at Fair Value $ 4,936 $ 2,442    
Fair Value As A Percentage of Member's Equity 14.50% 7.40%    
Investment, Identifier [Axis]: Apollon Holdings, LLC (d/b/a Apollon Wealth Management, LLC) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ApollonHoldingsLlcMember whfcl:ApollonHoldingsLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Asset Management & Custody Banks Asset Management & Custody Banks Asset Management & Custody Banks  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.17% 9.37% 9.17%  
Investment, Acquisition Date Jul. 21, 2025 Jul. 21, 2025    
Investment Maturity Date Jun. 18, 2032 Jun. 18, 2032 Jun. 18, 2032  
Investment Owned, Balance, Principal Amount $ 6,600 $ 6,633    
Investment Owned, at Cost 6,516 6,542    
Investment Owned, at Fair Value $ 6,645 $ 6,632    
Fair Value As A Percentage of Member's Equity 19.50% 20.20%    
Investment, Identifier [Axis]: Arcserve Cayman GP LLC (d/b/a Arcserve (USA), LLC), Common Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ArcserveCaymanGpLlcMember whfcl:ArcserveCaymanGpLlcMember    
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software  
Investment, Acquisition Date Jan. 03, 2024 Jan. 03, 2024    
Investment Owned, Balance, Principal Amount $ 663 $ 663    
Investment, Identifier [Axis]: Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC) First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ArcserveCaymanOpcoLpMember whfcl:ArcserveCaymanOpcoLpMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00%  
Investment, Acquisition Date Jan. 03, 2024 Jan. 03, 2024    
Investment Maturity Date Jan. 04, 2027 Jan. 04, 2027 Jan. 04, 2027  
Investment Owned, Balance, Principal Amount $ 829 $ 781    
Investment Owned, at Cost 825 775    
Investment Owned, at Fair Value $ 1,226 $ 1,240   1,247
Investment, Interest Rate, Paid in Kind 11.73% 11.99% 11.73%  
Percent of net assets 0.50% 0.50% 0.50%  
Investment, Identifier [Axis]: Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC) Unsecured Loan One        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ArcserveCaymanOpcoLpMember whfcl:ArcserveCaymanOpcoLpMember    
Investment, Type [Extensible Enumeration] whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software  
Investment, Interest Rate, Floor 0.00%   0.00%  
Investment, Acquisition Date Jan. 03, 2024 Jan. 03, 2024    
Investment Maturity Date Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029  
Investment Owned, Balance, Principal Amount $ 665 $ 636    
Investment Owned, at Cost 658 627    
Investment Owned, at Fair Value $ 665 $ 636   581
Investment, Interest Rate, Paid in Kind   9.00%    
Percent of net assets 0.30% 0.20% 0.30%  
Investment, Identifier [Axis]: Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC) Unsecured Loan Two        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ArcserveCaymanOpcoLpMember whfcl:ArcserveCaymanOpcoLpMember    
Investment, Type [Extensible Enumeration] whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software  
Investment, Interest Rate, Floor 0.00%   0.00%  
Investment, Acquisition Date Jan. 03, 2024 Jan. 03, 2024    
Investment Maturity Date Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029  
Investment Owned, Balance, Principal Amount $ 680 $ 650    
Investment Owned, at Cost 673 642    
Investment Owned, at Fair Value $ 680 $ 650   594
Investment, Interest Rate, Paid in Kind   9.00%    
Percent of net assets 0.30% 0.30% 0.30%  
Investment, Identifier [Axis]: Arcserve Cayman Topco LP (d/b/a Arcserve (USA), LLC), Common Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ArcserveCaymanTopcoLpMember whfcl:ArcserveCaymanTopcoLpMember    
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software  
Investment, Acquisition Date Jan. 03, 2024 Jan. 03, 2024    
Investment Owned, Balance, Principal Amount $ 663 $ 663    
Investment Owned, at Cost 19,568 19,568    
Investment Owned, at Fair Value $ 9,149 $ 9,144   9,131
Percent of net assets 3.60% 3.50% 3.60%  
Investment, Identifier [Axis]: Atlas Parent, LLC, Common Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:AtlasParentLlcMember whfcl:AtlasParentLlcMember    
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software  
Investment, Acquisition Date Oct. 24, 2025 Oct. 24, 2025    
Investment Owned, Balance, Principal Amount $ 19 $ 19    
Investment Owned, at Cost 1,682 1,682    
Investment Owned, at Fair Value $ 1,690 $ 1,853    
Percent of net assets 0.70% 0.70% 0.70%  
Investment, Identifier [Axis]: Avision Holdings, LLC (d/b/a Avision Sales Group) First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:AvisionHoldingsLLCMember whfcl:AvisionHoldingsLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00%  
Investment Interest Rate 9.88% 9.82% 9.88%  
Investment, Acquisition Date May 31, 2024 May 31, 2024    
Investment Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026  
Investment Owned, Balance, Principal Amount $ 545 $ 548    
Investment Owned, at Cost 543 544    
Investment Owned, at Fair Value $ 544 $ 546    
Percent of net assets 0.20% 0.20% 0.20%  
Investment, Identifier [Axis]: Avision Holdings, LLC (d/b/a Avision Sales Group) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:AvisionHoldingsLLCMember whfcl:AvisionHoldingsLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00%  
Investment Interest Rate 9.88% 9.82% 9.88%  
Investment, Acquisition Date May 31, 2024 May 31, 2024    
Investment Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026  
Investment Owned, Balance, Principal Amount $ 648 $ 652    
Investment Owned, at Cost 646 647    
Investment Owned, at Fair Value $ 647 $ 650    
Percent of net assets 0.30% 0.30% 0.30%  
Investment, Identifier [Axis]: Avision Holdings, LLC (d/b/a Avision Sales Group), Class A LLC Interests        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:AvisionHoldingsLLCMember whfcl:AvisionHoldingsLLCMember    
Investment, Type [Extensible Enumeration] whfcl:ClassALLCInterestsMember whfcl:ClassALLCInterestsMember whfcl:ClassALLCInterestsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising  
Investment, Acquisition Date Dec. 15, 2021 Dec. 15, 2021    
Investment Owned, Balance, Principal Amount $ 319 $ 299    
Investment Owned, at Cost 319 299    
Investment Owned, at Fair Value $ 297 $ 322    
Percent of net assets 0.10% 0.10% 0.10%  
Investment, Identifier [Axis]: BBQ Buyer, LLC Shares        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:BBQBuyerLLCMember whfcl:BBQBuyerLLCMember    
Investment, Type [Extensible Enumeration] whfcl:SharesMember Common Stock [Member] whfcl:SharesMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances  
Investment, Acquisition Date Aug. 28, 2020 Aug. 28, 2020    
Investment Owned, Balance, Principal Amount $ 1,100 $ 1,100    
Investment Owned, at Cost 1,100 1,100    
Investment Owned, at Fair Value $ 911 $ 1,003    
Percent of net assets 0.40% 0.40% 0.40%  
Investment, Identifier [Axis]: BL Products Parent, LP (d/b/a Bishop Lifting Products, Inc.) Class A Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:BLProductsParentLPMember whfcl:BLProductsParentLPMember    
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components  
Investment, Acquisition Date Feb. 01, 2022 Feb. 01, 2022    
Investment Owned, Balance, Principal Amount $ 733 $ 733    
Investment Owned, at Cost 788 788    
Investment Owned, at Fair Value $ 344 $ 561    
Percent of net assets 0.10% 0.20% 0.10%  
Investment, Identifier [Axis]: BPII-JL Group Holdings LP (d/b/a Juniper Landscaping Holdings LLC) Class A Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:BPII-JLGroupHoldingsLPMember whfcl:BPII-JLGroupHoldingsLPMember    
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Acquisition Date Dec. 29, 2021 Dec. 29, 2021    
Investment Owned, Balance, Principal Amount $ 90 $ 90    
Investment Owned, at Cost 942 942    
Investment Owned, at Fair Value $ 1,577 $ 1,645    
Percent of net assets 0.60% 0.60% 0.60%  
Investment, Identifier [Axis]: BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.) First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Busa Acquisition Co BankCard Usa Merchant Services Inc [Member] Busa Acquisition Co BankCard Usa Merchant Services Inc [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.37% 10.34% 10.37%  
Investment, Acquisition Date Apr. 04, 2024 Apr. 04, 2024    
Investment Maturity Date Apr. 10, 2029 Mar. 30, 2029 Apr. 10, 2029  
Investment Owned, Balance, Principal Amount $ 276 $ 276    
Investment Owned, at Cost 271 270    
Investment Owned, at Fair Value $ 283 $ 283    
Percent of net assets 0.10% 0.10% 0.10%  
Investment, Identifier [Axis]: BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Busa Acquisition Co BankCard Usa Merchant Services Inc [Member] Busa Acquisition Co BankCard Usa Merchant Services Inc [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.19% 10.29% 10.19%  
Investment, Acquisition Date Apr. 04, 2024 Apr. 04, 2024    
Investment Maturity Date Apr. 10, 2029 Mar. 30, 2029 Apr. 10, 2029  
Investment Owned, Balance, Principal Amount $ 7,116 $ 7,374    
Investment Owned, at Cost 6,998 7,231    
Investment Owned, at Fair Value $ 7,092 $ 7,331    
Percent of net assets 2.80% 2.80% 2.80%  
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:BannerAcquisitionHoldingsLLCMember whfcl:BannerAcquisitionHoldingsLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25%  
Investment Interest Rate 9.91% 10.07% 9.91%  
Investment, Acquisition Date Dec. 21, 2023 Dec. 21, 2023    
Investment Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029  
Investment Owned, Balance, Principal Amount $ 1,848 $ 1,873    
Investment Owned, at Cost 1,825 1,845    
Investment Owned, at Fair Value $ 1,848 $ 1,766    
Fair Value As A Percentage of Member's Equity 5.40% 5.40%    
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:BannerAcquisitionHoldingsLLCMember whfcl:BannerAcquisitionHoldingsLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25%  
Investment Interest Rate 9.91% 10.07% 9.91%  
Investment, Acquisition Date Dec. 21, 2023 Dec. 21, 2023    
Investment Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029  
Investment Owned, Balance, Principal Amount $ 168 $ 168    
Investment Owned, at Cost 166 166    
Investment Owned, at Fair Value $ 180 $ 118    
Fair Value As A Percentage of Member's Equity 0.50% 0.40%    
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:BannerAcquisitionHoldingsLLCMember whfcl:BannerAcquisitionHoldingsLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25%  
Investment Interest Rate 9.91% 10.07% 9.91%  
Investment, Acquisition Date Dec. 21, 2023 Dec. 21, 2023    
Investment Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029  
Investment Owned, Balance, Principal Amount $ 2,917 $ 2,956    
Investment Owned, at Cost 2,881 2,912    
Investment Owned, at Fair Value $ 2,917 $ 2,787    
Fair Value As A Percentage of Member's Equity 8.60% 8.40%    
Investment, Identifier [Axis]: Barrett Purchaser LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:BarrettPurchaserLlcMember whfcl:BarrettPurchaserLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 6.00% 5.92% 6.00%  
Investment Interest Rate 9.68% 10.02% 9.68%  
Investment, Acquisition Date Jan. 10, 2024 Jan. 10, 2024    
Investment Maturity Date Nov. 21, 2028 Nov. 21, 2028 Nov. 21, 2028  
Investment Owned, Balance, Principal Amount $ 447 $ 373    
Investment Owned, at Cost 442 367    
Investment Owned, at Fair Value $ 439 $ 366    
Fair Value As A Percentage of Member's Equity 1.30% 1.10%    
Investment, Identifier [Axis]: Barrett Purchaser LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:BarrettPurchaserLlcMember whfcl:BarrettPurchaserLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 6.00% 6.00% 6.00%  
Investment Interest Rate 9.67% 9.82% 9.67%  
Investment, Acquisition Date Jan. 10, 2024 Jan. 10, 2024    
Investment Maturity Date Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029  
Investment Owned, Balance, Principal Amount $ 3,562 $ 3,580    
Investment Owned, at Cost 3,512 3,523    
Investment Owned, at Fair Value $ 3,480 $ 3,493    
Fair Value As A Percentage of Member's Equity 10.20% 10.60%    
Investment, Identifier [Axis]: Buckeye Acquiror LLC (d/b/a Superior Environmental Solutions, LLC) First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:BuckeyeAcquirorLlcMember    
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Environmental & Facilities Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) One Month Term [Member]    
Investment, Interest Rate, Floor   1.00%    
Spread Above Index   6.50%    
Investment Interest Rate   10.32%    
Investment, Acquisition Date   Dec. 17, 2025    
Investment Maturity Date   Aug. 01, 2029    
Investment, Identifier [Axis]: Buckeye Acquiror LLC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:BuckeyeAcquirorLlcMember whfcl:BuckeyeAcquirorLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.42% 6.44% 6.42%  
Investment Interest Rate 8.28% 10.26% 8.28%  
Investment, Acquisition Date Aug. 09, 2023 Aug. 09, 2023    
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Investment Owned, Balance, Principal Amount $ 2,405 $ 2,319    
Investment Owned, at Cost 2,371 2,281    
Investment Owned, at Fair Value $ 2,406 $ 2,323    
Fair Value As A Percentage of Member's Equity 7.10% 7.10%    
Investment, Identifier [Axis]: Buckeye Acquiror LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:BuckeyeAcquirorLlcMember whfcl:BuckeyeAcquirorLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.24% 10.32% 10.24%  
Investment, Acquisition Date Aug. 09, 2023 Aug. 09, 2023    
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Investment Owned, Balance, Principal Amount $ 643 $ 370    
Investment Owned, at Cost 635 365    
Investment Owned, at Fair Value $ 648 $ 379    
Fair Value As A Percentage of Member's Equity 1.90% 1.20%    
Investment, Identifier [Axis]: Buckeye Acquiror LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:BuckeyeAcquirorLlcMember whfcl:BuckeyeAcquirorLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.42% 6.42% 6.42%  
Investment Interest Rate 10.16% 10.23% 10.16%  
Investment, Acquisition Date Aug. 09, 2023 Aug. 09, 2023    
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Investment Owned, Balance, Principal Amount $ 6,799 $ 6,834    
Investment Owned, at Cost 6,713 6,733    
Investment Owned, at Fair Value $ 6,795 $ 6,834    
Fair Value As A Percentage of Member's Equity 20.00% 20.80%    
Investment, Identifier [Axis]: CX Holdco LLC Common Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:CXHoldcoLLCMember whfcl:CXHoldcoLLCMember    
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Acquisition Date May 04, 2021 May 04, 2021    
Investment Owned, Balance, Principal Amount $ 1,068 $ 1,068    
Investment Owned, at Cost $ 1,116 1,116    
Investment Owned, at Fair Value   $ 218    
Percent of net assets   0.10%    
Investment, Identifier [Axis]: Camarillo Fitness Holdings, LLC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Camarillo Fitness Holdings, LLC [Member] Camarillo Fitness Holdings, LLC [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 8.50% 8.50% 8.50%  
Investment, Acquisition Date Jan. 10, 2025 Jan. 10, 2025    
Investment Maturity Date Sep. 25, 2029 Sep. 25, 2029 Sep. 25, 2029  
Investment Owned, Balance, Principal Amount $ 1,380 $ 1,218    
Investment Owned, at Cost 1,216 1,135    
Investment Owned, at Fair Value $ 249 $ 196    
Investment, Interest Rate, Paid in Kind   12.83%    
Percent of net assets 0.10% 0.10% 0.10%  
Investment, Identifier [Axis]: Camarillo Fitness Holdings, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Camarillo Fitness Holdings, LLC [Member] Camarillo Fitness Holdings, LLC [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 8.50% 8.50% 8.50%  
Investment, Acquisition Date Sep. 25, 2024 Sep. 25, 2024    
Investment Maturity Date Sep. 25, 2029 Sep. 25, 2029 Sep. 25, 2029  
Investment Owned, Balance, Principal Amount $ 14,213 $ 13,370    
Investment Owned, at Cost 10,231 10,231    
Investment Owned, at Fair Value $ 2,563 $ 5,354   10,492
Investment, Interest Rate, Paid in Kind 12.38% 12.32% 12.38%  
Percent of net assets 1.00% 2.10% 1.00%  
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC (d/b/a Camp Construction Services, Inc.) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:CampFacilityServicesHoldingsLLCMember whfcl:CampFacilityServicesHoldingsLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Real Estate Services Real Estate Services Real Estate Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.24% 10.32% 10.24%  
Investment, Acquisition Date Nov. 16, 2021 Nov. 16, 2021    
Investment Maturity Date Nov. 16, 2028 Nov. 16, 2027 Nov. 16, 2028  
Investment Owned, Balance, Principal Amount $ 10,197 $ 10,294    
Investment Owned, at Cost 10,147 10,230    
Investment Owned, at Fair Value $ 9,380 $ 9,781    
Percent of net assets 3.70% 3.80% 3.70%  
Investment, Identifier [Axis]: Camp Facility Services Parent, LLC Preferred Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:CampFacilityServicesParentLLCMember whfcl:CampFacilityServicesParentLLCMember    
Investment, Type [Extensible Enumeration] whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Real Estate Services Real Estate Services Real Estate Services  
Investment, Acquisition Date Nov. 16, 2021 Nov. 16, 2021    
Investment Owned, Balance, Principal Amount $ 15 $ 15    
Investment Owned, at Cost $ 840 840    
Investment Owned, at Fair Value   $ 31    
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:CennoxHoldingsLimitedMember whfcl:CennoxHoldingsLimitedMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] SONIA Sterling Overnight Index Average [Member] SONIA  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75%  
Investment Interest Rate 10.60% 10.59% 10.60%  
Investment, Acquisition Date Sep. 11, 2024 Sep. 11, 2024    
Investment Maturity Date May 04, 2029 May 04, 2029 May 04, 2029  
Investment Owned, Balance, Principal Amount $ 167 $ 158    
Investment Owned, at Cost 217 206    
Investment Owned, at Fair Value $ 206 $ 205    
Investment, Interest Rate, Paid in Kind 0.25% 0.25% 0.25%  
Investment, Interest Rate, Paid in Cash 10.35% 10.34% 10.35%  
Fair Value As A Percentage of Member's Equity 0.60% 0.60%    
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:CennoxHoldingsLimitedMember whfcl:CennoxHoldingsLimitedMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] SONIA Sterling Overnight Index Average [Member] SONIA  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.65% 6.75%  
Investment Interest Rate 10.60% 10.59% 10.60%  
Investment, Acquisition Date Sep. 11, 2024 Sep. 11, 2024    
Investment Maturity Date May 04, 2029 May 04, 2029 May 04, 2029  
Investment Owned, Balance, Principal Amount $ 546 $ 553    
Investment Owned, at Cost 712 721    
Investment Owned, at Fair Value $ 673 $ 717    
Investment, Interest Rate, Paid in Kind 0.25% 0.25% 0.25%  
Investment, Interest Rate, Paid in Cash 10.35% 10.34% 10.35%  
Fair Value As A Percentage of Member's Equity 2.00% 2.20%    
Investment, Identifier [Axis]: Cennox, Inc, First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:CennoxInc.Member whfcl:CennoxInc.Member    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75%  
Investment Interest Rate 10.56% 10.60% 10.56%  
Investment, Acquisition Date Sep. 11, 2024 Sep. 11, 2024    
Investment Maturity Date May 04, 2029 May 04, 2029 May 04, 2029  
Investment Owned, Balance, Principal Amount $ 142 $ 134    
Investment Owned, at Cost 142 133    
Investment Owned, at Fair Value $ 132 $ 129    
Investment, Interest Rate, Paid in Kind 0.25% 0.25% 0.25%  
Investment, Interest Rate, Paid in Cash 10.31% 10.35% 10.31%  
Fair Value As A Percentage of Member's Equity 0.40% 0.40%    
Investment, Identifier [Axis]: Cennox, Inc, First Lien Secured Term Loan One        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:CennoxInc.Member whfcl:CennoxInc.Member    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Euro Interbank Offered Rate Six Month Term [Member] Euro Interbank Offered Rate Six Month Term [Member] Euro Interbank Offered Rate Six Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.00% 7.00% 7.00%  
Investment Interest Rate 9.14% 9.07% 9.14%  
Investment, Acquisition Date Sep. 11, 2024 Sep. 11, 2024    
Investment Maturity Date May 04, 2029 May 04, 2029 May 04, 2029  
Investment Owned, Balance, Principal Amount   $ 616 € 617  
Investment Owned, at Cost $ 678 676    
Investment Owned, at Fair Value $ 663 $ 694    
Investment, Interest Rate, Paid in Kind 0.25% 0.25% 0.25%  
Investment, Interest Rate, Paid in Cash 8.89% 8.82% 8.89%  
Fair Value As A Percentage of Member's Equity 1.90% 2.10%    
Investment, Identifier [Axis]: Cennox, Inc. First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:CennoxInc.Member whfcl:CennoxInc.Member    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75%  
Investment Interest Rate 10.48% 10.89% 10.48%  
Investment, Acquisition Date Sep. 11, 2024 Sep. 11, 2024    
Investment Maturity Date May 04, 2029 May 04, 2029 May 04, 2029  
Investment Owned, Balance, Principal Amount $ 3,506 $ 3,508    
Investment Owned, at Cost 3,485 3,485    
Investment Owned, at Fair Value $ 3,259 $ 3,369    
Investment, Interest Rate, Paid in Kind 0.25% 0.25% 0.25%  
Investment, Interest Rate, Paid in Cash 10.23% 10.64% 10.23%  
Fair Value As A Percentage of Member's Equity 9.60% 10.20%    
Investment, Identifier [Axis]: Chase Products Co. (f/k/a Starco) Second Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ChaseProductsCoMember whfcl:ChaseProductsCoMember    
Investment, Type [Extensible Enumeration] whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Chemicals [Member] Diversified Chemicals [Member] Diversified Chemicals [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.23% 9.17% 9.23%  
Investment, Acquisition Date Mar. 16, 2023 Mar. 16, 2023    
Investment Maturity Date Mar. 16, 2028 Mar. 16, 2028 Mar. 16, 2028  
Investment Owned, Balance, Principal Amount $ 3,404 $ 3,404    
Investment Owned, at Cost 3,404 3,404    
Investment Owned, at Fair Value $ 3,404 $ 3,404   3,342
Investment, Interest Rate, Paid in Kind   0.18%    
Investment, Interest Rate, Paid in Cash   8.99%    
Percent of net assets 1.30% 1.30% 1.30%  
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ClaridgeProductsandEquipmentLLCMember whfcl:ClaridgeProductsandEquipmentLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Office Services And Supplies [Member] Office Services And Supplies [Member] Office Services And Supplies [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.56% 8.38% 7.56%  
Investment Interest Rate 12.64% 13.54% 12.64%  
Investment, Acquisition Date Dec. 30, 2020 Dec. 30, 2020    
Investment Maturity Date Mar. 31, 2027 Mar. 31, 2027 Mar. 31, 2027  
Investment Owned, Balance, Principal Amount $ 632 $ 561    
Investment Owned, at Cost 632 561    
Investment Owned, at Fair Value $ 618 $ 498    
Investment, Interest Rate, Paid in Kind 4.20% 4.19% 4.20%  
Investment, Interest Rate, Paid in Cash 8.44% 9.11% 8.44%  
Percent of net assets 0.20% 0.20% 0.20%  
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ClaridgeProductsandEquipmentLLCMember whfcl:ClaridgeProductsandEquipmentLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Office Services And Supplies [Member] Office Services And Supplies [Member] Office Services And Supplies [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.75% 8.00%  
Investment Interest Rate 11.74% 12.57% 11.74%  
Investment, Acquisition Date Dec. 30, 2020 Dec. 30, 2020    
Investment Maturity Date Mar. 31, 2027 Mar. 31, 2027 Mar. 31, 2027  
Investment Owned, Balance, Principal Amount $ 5,246 $ 5,124    
Investment Owned, at Cost 5,245 5,123    
Investment Owned, at Fair Value $ 5,142 $ 4,661    
Investment, Interest Rate, Paid in Kind 4.00% 4.38% 4.00%  
Investment, Interest Rate, Paid in Cash 7.74% 8.19% 7.74%  
Percent of net assets 2.10% 1.80% 2.10%  
Investment, Identifier [Axis]: Clark Restaurant Service, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ClarkRestaurantServiceLlcMember whfcl:ClarkRestaurantServiceLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Food Distributors Food Distributors Food Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.38% 9.47% 9.38%  
Investment, Acquisition Date Feb. 13, 2026 Jun. 14, 2024    
Investment Maturity Date May 10, 2029 May 10, 2029 May 10, 2029  
Investment Owned, Balance, Principal Amount $ 219 $ 4,956    
Investment Owned, at Cost 215 4,889    
Investment Owned, at Fair Value $ 218 $ 4,928    
Fair Value As A Percentage of Member's Equity   15.00%    
Percent of net assets 0.10%   0.10%  
Investment, Identifier [Axis]: Clark Restaurant Service, LLC First Lien Secured Term Loan, One        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ClarkRestaurantServiceLlcMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Food Distributors   Food Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member]   Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 5.75%   5.75%  
Investment Interest Rate 9.39%   9.39%  
Investment, Acquisition Date Jun. 14, 2024      
Investment Maturity Date May 10, 2029   May 10, 2029  
Investment Owned, Balance, Principal Amount $ 4,896      
Investment Owned, at Cost 4,839      
Investment Owned, at Fair Value $ 4,877      
Fair Value As A Percentage of Member's Equity 14.30%      
Investment, Identifier [Axis]: Colonnade Parent, Inc. (d/b/a Naviga Inc.) First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ColonnadeParentIncMember whfcl:ColonnadeParentIncMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Application Software Air Freight & Logistics  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 1.00% 1.00% 1.00%  
Investment Interest Rate 4.83% 4.77% 4.83%  
Investment, Acquisition Date Jun. 14, 2019 Jun. 14, 2019    
Investment Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026  
Investment Owned, Balance, Principal Amount $ 301 $ 301    
Investment Owned, at Cost 279 287    
Investment Owned, at Fair Value $ 159 $ 158    
Percent of net assets 0.10% 0.10% 0.10%  
Investment, Identifier [Axis]: Colonnade Parent, Inc. (d/b/a Naviga Inc.) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ColonnadeParentIncMember whfcl:ColonnadeParentIncMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Application Software Air Freight & Logistics  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 1.00% 1.00% 1.00%  
Investment Interest Rate 4.83% 4.77% 4.83%  
Investment, Acquisition Date Jun. 14, 2019 Jun. 14, 2019    
Investment Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026  
Investment Owned, Balance, Principal Amount $ 3,644 $ 3,667    
Investment Owned, at Cost 2,883 2,988    
Investment Owned, at Fair Value $ 1,920 $ 1,925    
Percent of net assets 0.80% 0.70% 0.80%  
Investment, Identifier [Axis]: Cultural Experiences Abroad, LLC (d/b/a Cultural Experiences Abroad, Inc.) First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:CulturalExperiencesAbroadLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Education Services [Member]   Education Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 5.86%   5.86%  
Investment Interest Rate 10.00%   10.00%  
Investment, Acquisition Date Jan. 21, 2026      
Investment Maturity Date Jan. 21, 2032   Jan. 21, 2032  
Investment Owned, Balance, Principal Amount $ 1,044      
Investment Owned, at Cost 1,030      
Investment Owned, at Fair Value $ 1,032      
Percent of net assets 0.40%   0.40%  
Investment, Identifier [Axis]: Cultural Experiences Abroad, LLC (d/b/a Cultural Experiences Abroad, Inc.) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:CulturalExperiencesAbroadLlcMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Education Services [Member]   Education Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 6.00%   6.00%  
Investment Interest Rate 9.73%   9.73%  
Investment, Acquisition Date Jan. 21, 2026      
Investment Maturity Date Jan. 21, 2032   Jan. 21, 2032  
Investment Owned, Balance, Principal Amount $ 9,485      
Investment Owned, at Cost 9,353      
Investment Owned, at Fair Value $ 9,365      
Percent of net assets 3.70%   3.70%  
Investment, Identifier [Axis]: Drew Foam Companies Inc First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:DrewFoamCompaniesIncMember whfcl:DrewFoamCompaniesIncMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00%  
Investment Interest Rate 9.74% 9.82% 9.74%  
Investment, Acquisition Date Nov. 09, 2020 Nov. 09, 2020    
Investment Maturity Date Dec. 05, 2028 Dec. 07, 2026 Dec. 05, 2028  
Investment Owned, Balance, Principal Amount $ 13,287 $ 13,358    
Investment Owned, at Cost 13,270 13,331    
Investment Owned, at Fair Value $ 13,245 $ 13,314    
Fair Value As A Percentage of Member's Equity 38.90% 40.50%    
Investment, Identifier [Axis]: ELM DebtCo, LLC, First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ElmDebtcoLlcMember whfcl:ElmDebtcoLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Multi-Utilities Multi-Utilities Multi-Utilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.50% 4.75% 4.50%  
Investment Interest Rate 8.23% 8.42% 8.23%  
Investment, Acquisition Date Nov. 20, 2025 Nov. 20, 2025    
Investment Maturity Date Nov. 14, 2031 Nov. 14, 2031 Nov. 14, 2031  
Investment Owned, at Fair Value $ 6      
Investment, Identifier [Axis]: ELM DebtCo, LLC, First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ElmDebtcoLlcMember whfcl:ElmDebtcoLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Multi-Utilities Multi-Utilities Multi-Utilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 3.50% 4.75% 3.50%  
Investment Interest Rate 10.25% 8.42% 10.25%  
Investment, Acquisition Date Nov. 20, 2025 Nov. 20, 2025    
Investment Maturity Date Nov. 14, 2031 Nov. 14, 2031 Nov. 14, 2031  
Investment Owned, Balance, Principal Amount $ 126      
Investment Owned, at Cost 125      
Investment Owned, at Fair Value $ 136      
Fair Value As A Percentage of Member's Equity 0.40%      
Investment, Identifier [Axis]: ELM DebtCo, LLC, First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ElmDebtcoLlcMember whfcl:ElmDebtcoLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Multi-Utilities Multi-Utilities Multi-Utilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.50% 4.75% 4.50%  
Investment Interest Rate 8.23% 8.42% 8.23%  
Investment, Acquisition Date Nov. 20, 2025 Nov. 20, 2025    
Investment Maturity Date Nov. 14, 2031 Nov. 14, 2031 Nov. 14, 2031  
Investment Owned, Balance, Principal Amount $ 5,515 $ 5,543    
Investment Owned, at Cost 5,465 5,488    
Investment Owned, at Fair Value $ 5,515 $ 5,488    
Fair Value As A Percentage of Member's Equity 16.20% 16.70%    
Investment, Identifier [Axis]: Eddy Acquisitions, LLC (d/b/a EducationDynamics, LLC) Preferred Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:EddyAcquisitionsLLCMember whfcl:EddyAcquisitionsLLCMember    
Investment, Type [Extensible Enumeration] whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising  
Investment, Acquisition Date Sep. 15, 2021 Sep. 15, 2021    
Investment Owned, Balance, Principal Amount $ 167 $ 167    
Investment Owned, at Cost $ 167 $ 167    
Investment, Identifier [Axis]: Education Dynamics, LLC Senior Preferred Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:EducationDynamicsLLCMember whfcl:EducationDynamicsLLCMember    
Investment, Type [Extensible Enumeration] whfcl:SeniorPreferredUnitsMember whfcl:SeniorPreferredUnitsMember whfcl:SeniorPreferredUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising  
Investment, Acquisition Date Sep. 15, 2021 Sep. 15, 2021    
Investment Owned, Balance, Principal Amount $ 167 $ 167    
Investment Owned, at Cost 167 $ 167    
Investment Owned, at Fair Value $ 61      
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:EducationDynamicsLLCMember whfcl:EducationDynamicsLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 12.25% 12.25% 12.25%  
Investment, Acquisition Date Sep. 15, 2021 Sep. 15, 2021    
Investment Maturity Date Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027  
Investment Owned, Balance, Principal Amount $ 540 $ 360    
Investment Owned, at Cost 538 358    
Investment Owned, at Fair Value $ 542 $ 320    
Percent of net assets 0.20% 0.10% 0.20%  
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:EducationDynamicsLLCMember whfcl:EducationDynamicsLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.25% 10.32% 10.25%  
Investment, Acquisition Date Sep. 15, 2021 Sep. 15, 2021    
Investment Maturity Date Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027  
Investment Owned, Balance, Principal Amount $ 12,564 $ 12,592    
Investment Owned, at Cost 12,522 12,532    
Investment Owned, at Fair Value $ 12,564 $ 12,137    
Percent of net assets 5.00% 4.70% 5.00%  
Investment, Identifier [Axis]: Empire amp; Co Inc. (d/b/a Empire Office, Inc.), First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:EmpireOfficeIncMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Office Services And Supplies [Member]   Office Services And Supplies [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member]   Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 6.00%   6.00%  
Investment Interest Rate 9.64%   9.64%  
Investment, Acquisition Date Jun. 01, 2026      
Investment Maturity Date May 30, 2031   May 30, 2031  
Investment Owned, Balance, Principal Amount $ 10,326      
Investment Owned, at Cost 10,123      
Investment Owned, at Fair Value $ 10,120      
Percent of net assets 4.00%   4.00%  
Investment, Identifier [Axis]: FloWorks International LLC, First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:FloworksInternationalLlcMember whfcl:FloworksInternationalLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Trading Companies & Distributors Trading Companies & Distributors Trading Companies & Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 4.75% 4.75% 4.75%  
Investment Interest Rate 8.41% 8.57% 8.41%  
Investment, Acquisition Date Dec. 12, 2024 Dec. 12, 2024    
Investment Maturity Date Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031  
Investment Owned, Balance, Principal Amount $ 665 $ 667    
Investment Owned, at Cost 659 661    
Investment Owned, at Fair Value $ 665 $ 663    
Fair Value As A Percentage of Member's Equity 2.00% 2.00%    
Investment, Identifier [Axis]: FloWorks International LLC, First Lien Secured Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:FloworksInternationalLlcMember whfcl:FloworksInternationalLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Trading Companies & Distributors Trading Companies & Distributors Trading Companies & Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 4.75% 4.75% 4.75%  
Investment Interest Rate 8.41% 8.57% 8.41%  
Investment, Acquisition Date Dec. 12, 2024 Dec. 12, 2024    
Investment Maturity Date Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031  
Investment Owned, Balance, Principal Amount $ 5,267 $ 5,293    
Investment Owned, at Cost 5,226 5,248    
Investment Owned, at Fair Value $ 5,267 $ 5,262    
Fair Value As A Percentage of Member's Equity 15.60% 16.00%    
Investment, Identifier [Axis]: Forward Solutions, LLC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ForwardSolutionsLlcMember whfcl:ForwardSolutionsLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75%  
Investment Interest Rate 10.63% 10.57% 10.63%  
Investment, Acquisition Date Mar. 11, 2022 Mar. 11, 2022    
Investment Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026  
Investment Owned, Balance, Principal Amount $ 2,977 $ 2,993    
Investment Owned, at Cost 2,972 2,981    
Investment Owned, at Fair Value $ 2,977 $ 2,993    
Fair Value As A Percentage of Member's Equity 8.70% 9.10%    
Investment, Identifier [Axis]: Forward Solutions, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ForwardSolutionsLlcMember whfcl:ForwardSolutionsLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75%  
Investment Interest Rate 10.63% 10.69% 10.63%  
Investment, Acquisition Date Feb. 18, 2022 Feb. 18, 2022    
Investment Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026  
Investment Owned, Balance, Principal Amount $ 173 $ 619    
Investment Owned, at Cost 173 617    
Investment Owned, at Fair Value $ 174 $ 619    
Fair Value As A Percentage of Member's Equity 0.50% 1.90%    
Investment, Identifier [Axis]: Forward Solutions, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ForwardSolutionsLlcMember whfcl:ForwardSolutionsLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75%  
Investment Interest Rate 10.63% 10.57% 10.63%  
Investment, Acquisition Date Feb. 18, 2022 Feb. 18, 2022    
Investment Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026  
Investment Owned, Balance, Principal Amount $ 8,868 $ 8,914    
Investment Owned, at Cost 8,852 8,880    
Investment Owned, at Fair Value $ 8,868 $ 8,914    
Fair Value As A Percentage of Member's Equity 26.10% 27.10%    
Investment, Identifier [Axis]: Four Winds Health, LLC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Four Winds Health, LLC [Member] Four Winds Health, LLC [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 7.00% 6.75%  
Investment Interest Rate 10.48% 10.67% 10.48%  
Investment, Acquisition Date Jul. 31, 2025 Jul. 31, 2025    
Investment Maturity Date Jul. 31, 2029 Jul. 31, 2029 Jul. 31, 2029  
Investment Owned, Balance, Principal Amount $ 498 $ 250    
Investment Owned, at Cost 493 248    
Investment Owned, at Fair Value $ 527 $ 272    
Percent of net assets 0.20% 0.10% 0.20%  
Investment, Identifier [Axis]: Four Winds Health, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Four Winds Health, LLC [Member] Four Winds Health, LLC [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 7.00% 6.75%  
Investment Interest Rate 10.48% 10.67% 10.48%  
Investment, Acquisition Date Jul. 31, 2025 Jul. 31, 2025    
Investment Maturity Date Jul. 31, 2029 Jul. 31, 2029 Jul. 31, 2029  
Investment Owned, at Fair Value $ 10 $ 8    
Investment, Identifier [Axis]: Four Winds Health, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Four Winds Health, LLC [Member] Four Winds Health, LLC [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 7.00% 6.75%  
Investment Interest Rate 10.48% 10.67% 10.48%  
Investment, Acquisition Date Jul. 31, 2025 Jul. 31, 2025    
Investment Maturity Date Jul. 31, 2029 Jul. 31, 2029 Jul. 31, 2029  
Investment Owned, Balance, Principal Amount $ 4,342 $ 4,364    
Investment Owned, at Cost 4,275 4,286    
Investment Owned, at Fair Value $ 4,360 $ 4,343    
Percent of net assets 1.70% 1.70% 1.70%  
Investment, Identifier [Axis]: Future Payment Technologies, LP First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:FuturePaymentTechnologiesLPMember whfcl:FuturePaymentTechnologiesLPMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 8.25% 8.25% 8.25%  
Investment Interest Rate 11.97% 12.22% 11.97%  
Investment, Acquisition Date Dec. 23, 2016 Dec. 23, 2016    
Investment Maturity Date Dec. 07, 2026 Dec. 07, 2026 Dec. 07, 2026  
Investment Owned, Balance, Principal Amount $ 18,552 $ 19,175    
Investment Owned, at Cost 18,545 19,160    
Investment Owned, at Fair Value $ 18,552 $ 19,175    
Percent of net assets 7.30% 7.40% 7.30%  
Investment, Identifier [Axis]: G-2 Lather Acquisition Corp. First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:G2LatherAcquisitionCorp.Member whfcl:G2LatherAcquisitionCorp.Member    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Personal Products Personal Products Personal Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.00% 5.00% 5.00%  
Investment Interest Rate 8.64% 8.72% 8.64%  
Investment, Acquisition Date Mar. 05, 2025 Mar. 05, 2025    
Investment Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031  
Investment Owned, at Fair Value $ 24 $ 10    
Fair Value As A Percentage of Member's Equity 0.10%      
Investment, Identifier [Axis]: G-2 Lather Acquisition Corp. First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:G2LatherAcquisitionCorp.Member whfcl:G2LatherAcquisitionCorp.Member    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Personal Products Personal Products Personal Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.00% 5.00% 5.00%  
Investment Interest Rate 8.64% 8.72% 8.64%  
Investment, Acquisition Date Mar. 05, 2025 Mar. 05, 2025    
Investment Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031  
Investment Owned, at Fair Value $ 7 $ 4    
Investment, Identifier [Axis]: G-2 Lather Acquisition Corp. First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:G2LatherAcquisitionCorp.Member whfcl:G2LatherAcquisitionCorp.Member    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Personal Products Personal Products Personal Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.00% 5.00% 5.00%  
Investment Interest Rate 8.64% 8.72% 8.64%  
Investment, Acquisition Date Mar. 05, 2025 Mar. 05, 2025    
Investment Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031  
Investment Owned, Balance, Principal Amount $ 3,880 $ 3,900    
Investment Owned, at Cost 3,836 3,850    
Investment Owned, at Fair Value $ 3,886 $ 3,873    
Fair Value As A Percentage of Member's Equity 11.40% 11.70%    
Investment, Identifier [Axis]: GTT Communications Global, LLC (d/b/a GTT Communications, Inc.), First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:GttCommunicationsGlobalLlcMember whfcl:GttCommunicationsGlobalLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Integrated Telecommunication Services Integrated Telecommunication Services Integrated Telecommunication Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00%  
Investment Interest Rate 9.65% 9.73% 9.65%  
Investment, Acquisition Date Apr. 15, 2025 Apr. 15, 2025    
Investment Maturity Date Apr. 15, 2031 Apr. 15, 2031 Apr. 15, 2031  
Investment Owned, Balance, Principal Amount $ 15,206 $ 15,283    
Investment Owned, at Cost 14,964 15,014    
Investment Owned, at Fair Value $ 15,157 $ 15,129    
Percent of net assets 6.00% 5.80% 6.00%  
Investment, Identifier [Axis]: Gulf Winds International Acquisition, LLC (d/b/a Gulf Winds International, Inc.) First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:GulfWindsInternationalAcquisitionLlcMember whfcl:GulfWindsInternationalAcquisitionLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.00% 7.00% 7.00%  
Investment Interest Rate 10.64% 10.72% 10.64%  
Investment, Acquisition Date Dec. 16, 2022 Dec. 16, 2022    
Investment Maturity Date Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028  
Investment Owned, Balance, Principal Amount $ 706 $ 605    
Investment Owned, at Cost 697 596    
Investment Owned, at Fair Value $ 684 $ 584    
Percent of net assets 0.30% 0.20% 0.30%  
Investment, Identifier [Axis]: Gulf Winds International Acquisition, LLC (d/b/a Gulf Winds International, Inc.) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:GulfWindsInternationalAcquisitionLlcMember whfcl:GulfWindsInternationalAcquisitionLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.00% 7.00% 7.00%  
Investment Interest Rate 10.64% 10.72% 10.64%  
Investment, Acquisition Date Dec. 16, 2022 Dec. 16, 2022    
Investment Maturity Date Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028  
Investment Owned, Balance, Principal Amount $ 8,955 $ 8,956    
Investment Owned, at Cost 8,843 8,820    
Investment Owned, at Fair Value $ 8,704 $ 8,697    
Investment, Interest Rate, Paid in Kind 1.00% 1.00% 1.00%  
Investment, Interest Rate, Paid in Cash 9.64% 9.72% 9.64%  
Percent of net assets 3.40% 3.30% 3.40%  
Investment, Identifier [Axis]: H I G Camarillo, LP, Limited Partners Interests        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:HIGCamarilloLpMember whfcl:HIGCamarilloLpMember    
Investment, Type [Extensible Enumeration] whfcl:LimitedPartnerInterestsMember whfcl:LimitedPartnerInterestsMember whfcl:LimitedPartnerInterestsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]  
Investment, Acquisition Date Sep. 25, 2024 Sep. 25, 2024    
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:HRGManagementLLCMember    
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Real Estate Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Base Rate [Member]    
Investment, Interest Rate, Floor   1.00%    
Spread Above Index   6.22%    
Investment Interest Rate   10.55%    
Investment, Acquisition Date   Feb. 18, 2022    
Investment Maturity Date   Oct. 19, 2026    
Investment Owned, Balance, Principal Amount   $ 1,154    
Investment Owned, at Cost   1,150    
Investment Owned, at Fair Value   $ 1,154    
Fair Value As A Percentage of Member's Equity   3.50%    
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:HRGManagementLLCMember    
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Real Estate Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]    
Investment, Interest Rate, Floor   1.00%    
Spread Above Index   6.25%    
Investment Interest Rate   10.27%    
Investment, Acquisition Date   Feb. 18, 2022    
Investment Maturity Date   Oct. 19, 2026    
Investment Owned, Balance, Principal Amount   $ 700    
Investment Owned, at Cost   698    
Investment Owned, at Fair Value   $ 701    
Fair Value As A Percentage of Member's Equity   2.10%    
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:HRGManagementLLCMember    
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Real Estate Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]    
Investment, Interest Rate, Floor   1.00%    
Spread Above Index   6.25%    
Investment Interest Rate   10.27%    
Investment, Acquisition Date   Dec. 28, 2021    
Investment Maturity Date   Oct. 19, 2026    
Investment Owned, Balance, Principal Amount   $ 4,602    
Investment Owned, at Cost   4,588    
Investment Owned, at Fair Value   $ 4,602    
Fair Value As A Percentage of Member's Equity   14.00%    
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:ITSBuyerIncMember    
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Air Freight & Logistics    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) One Month Term [Member]    
Investment, Interest Rate, Floor   1.00%    
Spread Above Index   6.00%    
Investment Interest Rate   9.83%    
Investment, Acquisition Date   Feb. 17, 2022    
Investment Maturity Date   Jun. 14, 2027    
Investment Owned, at Fair Value   $ 2    
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:ITSBuyerIncMember    
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Air Freight & Logistics    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) One Month Term [Member]    
Investment, Interest Rate, Floor   1.00%    
Spread Above Index   6.00%    
Investment Interest Rate   9.83%    
Investment, Acquisition Date   Feb. 17, 2022    
Investment Maturity Date   Jun. 14, 2027    
Investment Owned, Balance, Principal Amount   $ 3,271    
Investment Owned, at Cost   3,262    
Investment Owned, at Fair Value   $ 3,271    
Fair Value As A Percentage of Member's Equity   10.00%    
Investment, Identifier [Axis]: ImageOne Industries, LLC Common A Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ImageOneIndustriesLLCMember whfcl:ImageOneIndustriesLLCMember    
Investment, Type [Extensible Enumeration] whfcl:CommonAUnitsMember whfcl:CommonAUnitsMember whfcl:CommonAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Office Services And Supplies [Member] Office Services And Supplies [Member] Office Services And Supplies [Member]  
Investment, Acquisition Date Sep. 20, 2019 Sep. 20, 2019    
Investment Owned, Balance, Principal Amount $ 244 $ 238    
Investment Owned, at Cost $ 18 $ 13    
Investment, Identifier [Axis]: Impact Advisors, LLC, First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ImpactAdvisorsLlcMember whfcl:ImpactAdvisorsLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Technology Health Care Technology Health Care Technology  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.50% 4.50% 4.50%  
Investment Interest Rate 8.23% 8.17% 8.23%  
Investment, Acquisition Date May 01, 2025 May 01, 2025    
Investment Maturity Date Mar. 21, 2031 Mar. 21, 2031 Mar. 21, 2031  
Investment Owned, Balance, Principal Amount $ 313      
Investment Owned, at Cost 311      
Investment Owned, at Fair Value $ 322 $ 10    
Fair Value As A Percentage of Member's Equity 0.90%      
Investment, Identifier [Axis]: Impact Advisors, LLC, First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ImpactAdvisorsLlcMember whfcl:ImpactAdvisorsLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Technology Health Care Technology Health Care Technology  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Prime Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 3.50% 4.50% 3.50%  
Investment Interest Rate 10.25% 8.17% 10.25%  
Investment, Acquisition Date May 01, 2025 May 01, 2025    
Investment Maturity Date Mar. 21, 2031 Mar. 21, 2031 Mar. 21, 2031  
Investment Owned, Balance, Principal Amount $ 280      
Investment Owned, at Cost 278      
Investment Owned, at Fair Value $ 281 $ 4    
Fair Value As A Percentage of Member's Equity 0.80%      
Investment, Identifier [Axis]: Impact Advisors, LLC, First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ImpactAdvisorsLlcMember whfcl:ImpactAdvisorsLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Technology Health Care Technology Health Care Technology  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.50% 4.50% 4.50%  
Investment Interest Rate 8.23% 8.17% 8.23%  
Investment, Acquisition Date May 01, 2025 May 01, 2025    
Investment Maturity Date Mar. 21, 2031 Mar. 21, 2031 Mar. 21, 2031  
Investment Owned, Balance, Principal Amount $ 4,148 $ 4,169    
Investment Owned, at Cost 4,115 4,132    
Investment Owned, at Fair Value $ 4,148 $ 4,169    
Fair Value As A Percentage of Member's Equity 12.20% 12.70%    
Investment, Identifier [Axis]: Industrial Service Solutions WC, Inc, First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:IndustrialServiceSolutionsMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services   Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member]   Base Rate [Member]  
Investment, Interest Rate, Floor 0.75%   0.75%  
Spread Above Index 4.12%   4.12%  
Investment Interest Rate 9.08%   9.08%  
Investment, Acquisition Date Apr. 23, 2026      
Investment Maturity Date Feb. 07, 2033   Feb. 07, 2033  
Investment Owned, Balance, Principal Amount $ 193      
Investment Owned, at Cost 191      
Investment Owned, at Fair Value $ 192      
Fair Value As A Percentage of Member's Equity 0.60%      
Investment, Identifier [Axis]: Industrial Service Solutions WC, Inc, First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:IndustrialServiceSolutionsMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services   Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member]   Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 0.75%   0.75%  
Spread Above Index 4.50%   4.50%  
Investment Interest Rate 8.14%   8.14%  
Investment, Acquisition Date Apr. 23, 2026      
Investment Maturity Date Feb. 07, 2033   Feb. 07, 2033  
Investment Owned, Balance, Principal Amount $ 5,111      
Investment Owned, at Cost 5,062      
Investment Owned, at Fair Value $ 5,072      
Fair Value As A Percentage of Member's Equity 14.90%      
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Infotree Holdco LLC [Member] Infotree Holdco LLC [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Human Resource & Employment Services Human Resource & Employment Services Human Resource & Employment Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.48% 9.42% 9.48%  
Investment, Acquisition Date Feb. 19, 2025 Feb. 19, 2025    
Investment Maturity Date Feb. 19, 2030 Feb. 19, 2030 Feb. 19, 2030  
Investment Owned, at Fair Value   $ 2    
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Revolving Loan One        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Infotree Holdco LLC [Member] Infotree Holdco LLC [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Human Resource & Employment Services Human Resource & Employment Services Human Resource & Employment Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.48% 9.42% 9.48%  
Investment, Acquisition Date Mar. 24, 2025 Mar. 24, 2025    
Investment Maturity Date Feb. 19, 2030 Feb. 19, 2030 Feb. 19, 2030  
Investment Owned, at Fair Value   $ 1    
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Infotree Holdco LLC [Member] Infotree Holdco LLC [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Human Resource & Employment Services Human Resource & Employment Services Human Resource & Employment Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.48% 9.42% 9.48%  
Investment, Acquisition Date Feb. 19, 2025 Feb. 19, 2025    
Investment Maturity Date Feb. 19, 2030 Feb. 19, 2030 Feb. 19, 2030  
Investment Owned, Balance, Principal Amount $ 2,933 $ 2,947    
Investment Owned, at Cost 2,890 2,899    
Investment Owned, at Fair Value $ 2,891 $ 2,907    
Percent of net assets 1.10% 1.10% 1.10%  
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Term Loan One        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Infotree Holdco LLC [Member] Infotree Holdco LLC [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Human Resource & Employment Services Human Resource & Employment Services Human Resource & Employment Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.48% 9.42% 9.48%  
Investment, Acquisition Date Mar. 24, 2025 Mar. 24, 2025    
Investment Maturity Date Feb. 19, 2030 Feb. 19, 2030 Feb. 19, 2030  
Investment Owned, Balance, Principal Amount $ 2,514 $ 2,526    
Investment Owned, at Cost 2,477 2,484    
Investment Owned, at Fair Value $ 2,478 $ 2,492    
Fair Value As A Percentage of Member's Equity 7.30% 7.60%    
Investment, Identifier [Axis]: Intermedia Cloud Communications, Inc. (d/b/a Intermedia.net, Inc.),First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:IntermediaCloudCommunicationsIncMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics   Air Freight & Logistics  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.75%   0.75%  
Spread Above Index 5.50%   5.50%  
Investment Interest Rate 9.16%   9.16%  
Investment, Acquisition Date May 27, 2026      
Investment Maturity Date Nov. 26, 2031   Nov. 26, 2031  
Investment Owned, Balance, Principal Amount $ 6,667      
Investment Owned, at Cost 6,601      
Investment Owned, at Fair Value $ 6,600      
Percent of net assets 2.60%   2.60%  
Investment, Identifier [Axis]: Intermedia Cloud Communications, Inc. (d/b/a  Intermedia.net, Inc.), First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:IntermediaCloudCommunicationsIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics   Air Freight & Logistics  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.75%   0.75%  
Spread Above Index 5.50%   5.50%  
Investment Interest Rate 9.16%   9.16%  
Investment, Acquisition Date May 27, 2026      
Investment Maturity Date Nov. 26, 2031   Nov. 26, 2031  
Investment, Identifier [Axis]: Island Energy Services, LLC, First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:IslandEnergyServicesLlcMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Oil and Gas Storage and Transportation [Member]   Oil and Gas Storage and Transportation [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.50%   0.50%  
Spread Above Index 5.75%   5.75%  
Investment Interest Rate 9.43%   9.43%  
Investment, Acquisition Date Jul. 16, 2025      
Investment Maturity Date Jul. 16, 2032   Jul. 16, 2032  
Investment Owned, Balance, Principal Amount $ 10,419      
Investment Owned, at Cost 10,056      
Investment Owned, at Fair Value $ 10,266      
Percent of net assets 4.10%   4.10%  
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:JuniperLandscapingHoldingsLLCMember whfcl:JuniperLandscapingHoldingsLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.41% 9.56% 9.41%  
Investment, Acquisition Date May 23, 2025 May 23, 2025    
Investment Maturity Date Dec. 29, 2027 Dec. 29, 2027 Dec. 29, 2027  
Investment Owned, Balance, Principal Amount $ 1,997 $ 890    
Investment Owned, at Cost 1,984 884    
Investment Owned, at Fair Value $ 2,008 $ 910    
Percent of net assets 0.80% 0.40% 0.80%  
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Delayed Draw Loan One        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:JuniperLandscapingHoldingsLLCMember whfcl:JuniperLandscapingHoldingsLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.39% 9.43% 9.39%  
Investment, Acquisition Date Mar. 01, 2022 Mar. 01, 2022    
Investment Maturity Date Dec. 29, 2027 Dec. 29, 2027 Dec. 29, 2027  
Investment Owned, Balance, Principal Amount $ 2,307 $ 2,319    
Investment Owned, at Cost 2,299 2,309    
Investment Owned, at Fair Value $ 2,307 $ 2,319    
Fair Value As A Percentage of Member's Equity 6.80% 7.10%    
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:JuniperLandscapingHoldingsLLCMember whfcl:JuniperLandscapingHoldingsLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.42% 9.51% 9.42%  
Investment, Acquisition Date May 23, 2025 May 23, 2025    
Investment Maturity Date Dec. 29, 2027 Dec. 29, 2027 Dec. 29, 2027  
Investment Owned, Balance, Principal Amount $ 403 $ 238    
Investment Owned, at Cost 399 235    
Investment Owned, at Fair Value $ 407 $ 246    
Percent of net assets 0.20% 0.10% 0.20%  
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Revolving Loan One        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:JuniperLandscapingHoldingsLLCMember whfcl:JuniperLandscapingHoldingsLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.42% 9.52% 9.42%  
Investment, Acquisition Date Mar. 01, 2022 Mar. 01, 2022    
Investment Maturity Date Dec. 29, 2027 Dec. 29, 2027 Dec. 29, 2027  
Investment Owned, Balance, Principal Amount $ 525 $ 310    
Investment Owned, at Cost 523 309    
Investment Owned, at Fair Value $ 527 $ 314    
Fair Value As A Percentage of Member's Equity 1.50% 1.00%    
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:JuniperLandscapingHoldingsLLCMember whfcl:JuniperLandscapingHoldingsLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.39% 9.43% 9.39%  
Investment, Acquisition Date May 23, 2025 May 23, 2025    
Investment Maturity Date Dec. 29, 2027 Dec. 29, 2027 Dec. 29, 2027  
Investment Owned, Balance, Principal Amount $ 452 $ 454    
Investment Owned, at Cost 448 449    
Investment Owned, at Fair Value $ 452 $ 454    
Percent of net assets 0.20% 0.20% 0.20%  
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Term Loan One        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:JuniperLandscapingHoldingsLLCMember whfcl:JuniperLandscapingHoldingsLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.39% 9.43% 9.39%  
Investment, Acquisition Date Mar. 01, 2022 Mar. 01, 2022    
Investment Maturity Date Dec. 29, 2027 Dec. 29, 2027 Dec. 29, 2027  
Investment Owned, Balance, Principal Amount $ 10,907 $ 10,964    
Investment Owned, at Cost 10,872 10,917    
Investment Owned, at Fair Value $ 10,907 $ 10,964    
Fair Value As A Percentage of Member's Equity 32.10% 33.30%    
Investment, Identifier [Axis]: KORE Wireless Group Inc. First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:KoreWirelessGroupIncMember whfcl:KoreWirelessGroupIncMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.14% 10.38% 10.14%  
Investment, Acquisition Date Nov. 27, 2023 Nov. 27, 2023    
Investment Maturity Date Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028  
Investment Owned, at Fair Value $ 8 $ 10    
Investment, Identifier [Axis]: KORE Wireless Group Inc. First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:KoreWirelessGroupIncMember whfcl:KoreWirelessGroupIncMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.14% 10.38% 10.14%  
Investment, Acquisition Date Nov. 27, 2023 Nov. 27, 2023    
Investment Maturity Date Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028  
Investment Owned, Balance, Principal Amount $ 6,258 $ 6,290    
Investment Owned, at Cost 6,199 6,218    
Investment Owned, at Fair Value $ 6,258 $ 6,290    
Fair Value As A Percentage of Member's Equity 18.40% 19.10%    
Investment, Identifier [Axis]: Kelso Industries LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Kelso Industries L L C [Member] Kelso Industries L L C [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.42% 9.57% 9.42%  
Investment, Acquisition Date Dec. 26, 2024 Dec. 26, 2024    
Investment Maturity Date Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029  
Investment Owned, Balance, Principal Amount $ 5,127 $ 4,785    
Investment Owned, at Cost 5,057 4,710    
Investment Owned, at Fair Value $ 5,127 $ 4,823    
Percent of net assets 2.00% 1.90% 2.00%  
Investment, Identifier [Axis]: Kelso Industries LLC, First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Kelso Industries L L C [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering   Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 5.75%   5.75%  
Investment Interest Rate 9.42%   9.42%  
Investment, Acquisition Date Jan. 27, 2026      
Investment Maturity Date Dec. 31, 2029   Dec. 31, 2029  
Investment Owned, at Fair Value $ 13      
Investment, Identifier [Axis]: Keras Holdings, LLC Shares        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:KerasHoldingsLLCMember whfcl:KerasHoldingsLLCMember    
Investment, Type [Extensible Enumeration] whfcl:SharesMember Common Stock [Member] whfcl:SharesMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Acquisition Date Dec. 31, 2020 Dec. 31, 2020    
Investment Owned, Balance, Principal Amount $ 496 $ 496    
Investment Owned, at Cost 496 496    
Investment Owned, at Fair Value $ 50 $ 446    
Percent of net assets   0.20%    
Investment, Identifier [Axis]: LINC Systems, LLC, First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:LINCSystemsLLCMember    
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Paper & Plastic Packaging Products & Materials    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Base Rate [Member]    
Investment, Interest Rate, Floor   1.00%    
Spread Above Index   6.25%    
Investment Interest Rate   10.32%    
Investment, Acquisition Date   Jun. 22, 2021    
Investment Maturity Date   Feb. 24, 2026    
Investment, Identifier [Axis]: LINC Systems, LLC, First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:LINCSystemsLLCMember    
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Paper & Plastic Packaging Products & Materials    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Base Rate [Member]    
Investment, Interest Rate, Floor   1.00%    
Spread Above Index   6.25%    
Investment Interest Rate   10.32%    
Investment, Acquisition Date   Jun. 22, 2021    
Investment Maturity Date   Feb. 24, 2026    
Investment Owned, Balance, Principal Amount   $ 7,900    
Investment Owned, at Cost   7,895    
Investment Owned, at Fair Value   $ 7,900    
Fair Value As A Percentage of Member's Equity   24.00%    
Investment, Identifier [Axis]: Leviathan Intermediate Holdco, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:LeviathanIntermediateHoldcoLlcMember whfcl:LeviathanIntermediateHoldcoLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.50% 1.50% 1.50%  
Spread Above Index 6.00% 6.00% 6.00%  
Investment Interest Rate 9.73% 9.67% 9.73%  
Investment, Acquisition Date Dec. 27, 2022 Dec. 27, 2022    
Investment Maturity Date Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027  
Investment Owned, at Fair Value $ 3 $ 4    
Investment, Identifier [Axis]: Leviathan Intermediate Holdco, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:LeviathanIntermediateHoldcoLlcMember whfcl:LeviathanIntermediateHoldcoLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.50% 1.50% 1.50%  
Spread Above Index 6.00% 6.00% 6.00%  
Investment Interest Rate 9.73% 9.67% 9.73%  
Investment, Acquisition Date Dec. 27, 2022 Dec. 27, 2022    
Investment Maturity Date Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027  
Investment Owned, Balance, Principal Amount $ 13,575 $ 13,645    
Investment Owned, at Cost 13,456 13,486    
Investment Owned, at Fair Value $ 13,519 $ 13,584    
Percent of net assets 5.30% 5.20% 5.30%  
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan A        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:LiftBrandsIncMember whfcl:LiftBrandsIncMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanAMember whfcl:FirstLienSecuredTermLoanAMember whfcl:FirstLienSecuredTermLoanAMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.50% 7.50%  
Investment Interest Rate 11.24% 11.32% 11.24%  
Investment, Acquisition Date Jun. 29, 2020 Jun. 29, 2020    
Investment Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026  
Investment Owned, Balance, Principal Amount $ 5,001 $ 5,120    
Investment Owned, at Cost 5,001 5,119    
Investment Owned, at Fair Value $ 5,001 $ 5,120    
Percent of net assets 2.00% 2.00% 2.00%  
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan B        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:LiftBrandsIncMember whfcl:LiftBrandsIncMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanBMember whfcl:FirstLienSecuredTermLoanBMember whfcl:FirstLienSecuredTermLoanBMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]  
Investment Interest Rate 9.50%   9.50%  
Investment, Acquisition Date Jun. 29, 2020 Jun. 29, 2020    
Investment Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026  
Investment Owned, Balance, Principal Amount $ 1,779 $ 1,753    
Investment Owned, at Cost 1,779 1,752    
Investment Owned, at Fair Value $ 1,779 $ 1,753    
Investment, Interest Rate, Paid in Kind   9.50%    
Percent of net assets 0.70% 0.70% 0.70%  
Investment, Identifier [Axis]: LogicMonitor, Inc. - First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] LogicMonitor, Inc. [Member] LogicMonitor, Inc. [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.16% 9.34% 9.16%  
Investment, Acquisition Date Nov. 19, 2024 Nov. 19, 2024    
Investment Maturity Date Nov. 19, 2031 Nov. 19, 2031 Nov. 19, 2031  
Investment Owned, Balance, Principal Amount $ 8,220 $ 8,220    
Investment Owned, at Cost 8,138 8,130    
Investment Owned, at Fair Value $ 8,220 $ 8,186    
Percent of net assets 3.30% 3.20% 3.30%  
Investment, Identifier [Axis]: LogicMonitor, Inc. First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] LogicMonitor, Inc. [Member] LogicMonitor, Inc. [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.16% 9.34% 9.16%  
Investment, Acquisition Date Dec. 02, 2025 Dec. 02, 2025    
Investment Maturity Date Nov. 19, 2031 Nov. 19, 2031 Nov. 19, 2031  
Investment Owned, at Fair Value $ 5      
Investment, Identifier [Axis]: LogicMonitor, Inc.- First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] LogicMonitor, Inc. [Member] LogicMonitor, Inc. [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.16% 9.34% 9.16%  
Investment, Acquisition Date Nov. 19, 2024 Nov. 19, 2024    
Investment Maturity Date Nov. 19, 2031 Nov. 19, 2031 Nov. 19, 2031  
Investment Owned, at Fair Value $ 7 $ 5    
Investment, Identifier [Axis]: M2S Group Intermediate Holdings, Inc. First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:M2sGroupIntermediateHoldingsIncMember whfcl:M2sGroupIntermediateHoldingsIncMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Paper Products Paper Products Paper Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.50% 0.50% 0.50%  
Spread Above Index 4.75% 4.75% 4.75%  
Investment Interest Rate 8.41% 8.59% 8.41%  
Investment, Acquisition Date Aug. 22, 2024 Aug. 22, 2024    
Investment Maturity Date Aug. 25, 2031 Aug. 25, 2031 Aug. 25, 2031  
Investment Owned, Balance, Principal Amount $ 8,966 $ 9,368    
Investment Owned, at Cost 8,503 8,838    
Investment Owned, at Fair Value $ 8,892 $ 9,276    
Percent of net assets 3.50% 3.60% 3.50%  
Investment, Identifier [Axis]: MBS Highway, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MbsHighwayLlcMember whfcl:MbsHighwayLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Application Software Air Freight & Logistics  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00%  
Investment Interest Rate 11.94% 12.03% 11.94%  
Investment, Acquisition Date Oct. 13, 2022 Oct. 13, 2022    
Investment Maturity Date Oct. 13, 2027 Oct. 13, 2027 Oct. 13, 2027  
Investment Owned, Balance, Principal Amount $ 9,156 $ 9,204    
Investment Owned, at Cost 9,097 9,122    
Investment Owned, at Fair Value $ 9,128 $ 9,184    
Percent of net assets 3.60% 3.50% 3.60%  
Investment, Identifier [Axis]: MGT Merger Target, LLC (d/b/a MGT Consulting Group), First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] MGT Merger Target, LLC [Member] MGT Merger Target, LLC [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.25% 5.00% 5.25%  
Investment Interest Rate 8.89% 8.74% 8.89%  
Investment, Acquisition Date Apr. 08, 2025 Apr. 08, 2025    
Investment Maturity Date Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029  
Investment Owned, Balance, Principal Amount $ 488 $ 283    
Investment Owned, at Cost 486 281    
Investment Owned, at Fair Value $ 479 $ 300    
Percent of net assets 0.20% 0.10% 0.20%  
Investment, Identifier [Axis]: MGT Merger Target, LLC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] MGT Merger Target, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services   IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 5.25%   5.25%  
Investment Interest Rate 8.91%   8.91%  
Investment, Acquisition Date May 10, 2023      
Investment Maturity Date Apr. 10, 2029   Apr. 10, 2029  
Investment Owned, Balance, Principal Amount $ 1,315      
Investment Owned, at Cost 1,297      
Investment Owned, at Fair Value $ 1,302      
Fair Value As A Percentage of Member's Equity 3.80%      
Investment, Identifier [Axis]: MGT Merger Target, LLC First Lien Secured Delayed Draw Loan, One        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   MGT Merger Target, LLC [Member]    
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   IT Consulting And Other Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) One Month Term [Member]    
Investment, Interest Rate, Floor   1.00%    
Spread Above Index   5.00%    
Investment Interest Rate   8.72%    
Investment, Acquisition Date   May 10, 2023    
Investment Maturity Date   Apr. 10, 2029    
Investment Owned, Balance, Principal Amount   $ 1,322    
Investment Owned, at Cost   1,300    
Investment Owned, at Fair Value   $ 1,322    
Fair Value As A Percentage of Member's Equity   4.00%    
Investment, Identifier [Axis]: MGT Merger Target, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] MGT Merger Target, LLC [Member] MGT Merger Target, LLC [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.25% 4.00% 4.25%  
Investment Interest Rate 11.00% 10.75% 11.00%  
Investment, Acquisition Date Apr. 07, 2025 Apr. 07, 2025    
Investment Maturity Date Apr. 10, 2028 Apr. 10, 2028 Apr. 10, 2028  
Investment Owned, Balance, Principal Amount $ 676 $ 714    
Investment Owned, at Cost 670 705    
Investment Owned, at Fair Value $ 670 $ 715    
Fair Value As A Percentage of Member's Equity 2.00% 2.20%    
Investment, Identifier [Axis]: MGT Merger Target, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] MGT Merger Target, LLC [Member] MGT Merger Target, LLC [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.25% 5.00% 5.25%  
Investment Interest Rate 8.91% 8.72% 8.91%  
Investment, Acquisition Date May 10, 2023 May 10, 2023    
Investment Maturity Date Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029  
Investment Owned, Balance, Principal Amount $ 8,512 $ 8,555    
Investment Owned, at Cost 8,406 8,430    
Investment Owned, at Fair Value $ 8,428 $ 8,567    
Fair Value As A Percentage of Member's Equity 24.80% 26.10%    
Investment, Identifier [Axis]: Mamp;M OpCo. LLC (d/b/a Escalent, Inc.) First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] M&M OpCo. LLC (d/b/a Escalent, Inc.) M&M OpCo. LLC (d/b/a Escalent, Inc.)    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00%  
Investment Interest Rate 9.73% 9.67% 9.73%  
Investment, Acquisition Date Apr. 07, 2023 Apr. 07, 2023    
Investment Maturity Date Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029  
Investment Owned, Balance, Principal Amount $ 76      
Investment Owned, at Cost 75      
Investment Owned, at Fair Value $ 78 $ 4    
Investment, Identifier [Axis]: Mamp;M OpCo. LLC (d/b/a Escalent, Inc.) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] M&M OpCo. LLC (d/b/a Escalent, Inc.) M&M OpCo. LLC (d/b/a Escalent, Inc.)    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00%  
Investment Interest Rate 9.73% 9.67% 9.73%  
Investment, Acquisition Date Apr. 07, 2023 Apr. 07, 2023    
Investment Maturity Date Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029  
Investment Owned, Balance, Principal Amount $ 4,751 $ 4,827    
Investment Owned, at Cost 4,686 4,748    
Investment Owned, at Fair Value $ 4,751 $ 4,827    
Percent of net assets 1.90% 1.90% 1.90%  
Investment, Identifier [Axis]: Marki Microwave, LLC, First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MarkiMicrowaveLlcMember whfcl:MarkiMicrowaveLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Electrical Components & Equipment Electrical Components & Equipment Electrical Components & Equipment  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.00% 4.25% 4.00%  
Investment Interest Rate 7.73% 8.12% 7.73%  
Investment, Acquisition Date Nov. 26, 2025 Nov. 26, 2025    
Investment Maturity Date Nov. 21, 2031 Nov. 21, 2031 Nov. 21, 2031  
Investment Owned, at Fair Value $ 6      
Investment, Identifier [Axis]: Marki Microwave, LLC, First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MarkiMicrowaveLlcMember whfcl:MarkiMicrowaveLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Electrical Components & Equipment Electrical Components & Equipment Electrical Components & Equipment  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Prime Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.00% 4.25% 4.00%  
Investment Interest Rate 7.73% 8.12% 7.73%  
Investment, Acquisition Date Nov. 26, 2025 Nov. 26, 2025    
Investment Maturity Date Nov. 21, 2031 Nov. 21, 2031 Nov. 21, 2031  
Investment Owned, at Fair Value $ 6      
Investment, Identifier [Axis]: Marki Microwave, LLC, First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MarkiMicrowaveLlcMember whfcl:MarkiMicrowaveLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Electrical Components & Equipment Electrical Components & Equipment Electrical Components & Equipment  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.00% 4.25% 4.00%  
Investment Interest Rate 7.73% 8.12% 7.73%  
Investment, Acquisition Date Nov. 26, 2025 Nov. 26, 2025    
Investment Maturity Date Nov. 21, 2031 Nov. 21, 2031 Nov. 21, 2031  
Investment Owned, Balance, Principal Amount $ 6,030 $ 6,045    
Investment Owned, at Cost 5,976 5,986    
Investment Owned, at Fair Value $ 5,995 $ 5,985    
Fair Value As A Percentage of Member's Equity 17.60% 18.20%    
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MarlinDTC-LSMidco2LLCMember whfcl:MarlinDTC-LSMidco2LLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Broadline Retail Broadline Retail Broadline Retail  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.24% 10.32% 10.24%  
Investment, Acquisition Date Jul. 19, 2019 Jul. 19, 2019    
Investment Maturity Date May 03, 2027 Jul. 01, 2026 May 03, 2027  
Investment Owned, at Fair Value $ (25) $ (39)    
Fair Value As A Percentage of Member's Equity (0.10%) (0.10%)    
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MarlinDTC-LSMidco2LLCMember whfcl:MarlinDTC-LSMidco2LLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Broadline Retail Broadline Retail Broadline Retail  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.24% 10.32% 10.24%  
Investment, Acquisition Date Jul. 19, 2019 Jul. 19, 2019    
Investment Maturity Date May 03, 2027 Jul. 01, 2026 May 03, 2027  
Investment Owned, Balance, Principal Amount $ 17,643 $ 18,019    
Investment Owned, at Cost 17,643 18,019    
Investment Owned, at Fair Value $ 17,002 $ 17,299    
Fair Value As A Percentage of Member's Equity 50.00% 52.60%    
Investment, Identifier [Axis]: Max Solutions Inc. Common Stock        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MaxSolutionsIncMember whfcl:MaxSolutionsIncMember    
Investment, Type [Extensible Enumeration] Common Stock [Member] Common Stock [Member] Common Stock [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials  
Investment, Acquisition Date Sep. 29, 2022 Sep. 29, 2022    
Investment Owned, Balance, Principal Amount $ 4 $ 4    
Investment Owned, at Cost $ 400 $ 400    
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MaxSolutionsIncMember whfcl:MaxSolutionsIncMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.90% 6.90% 6.90%  
Investment Interest Rate 8.66% 10.89% 8.66%  
Investment, Acquisition Date Oct. 07, 2022 Oct. 07, 2022    
Investment Maturity Date Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028  
Investment Owned, Balance, Principal Amount $ 408 $ 410    
Investment Owned, at Cost 406 407    
Investment Owned, at Fair Value $ 408 $ 408    
Fair Value As A Percentage of Member's Equity 1.20% 1.20%    
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MaxSolutionsIncMember whfcl:MaxSolutionsIncMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.90% 6.90% 6.90%  
Investment Interest Rate 8.66% 10.89% 8.66%  
Investment, Acquisition Date Oct. 07, 2022 Oct. 07, 2022    
Investment Maturity Date Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028  
Investment Owned, at Fair Value $ 1 $ 1    
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MaxSolutionsIncMember whfcl:MaxSolutionsIncMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.91% 6.91% 6.91%  
Investment Interest Rate 8.66% 10.90% 8.66%  
Investment, Acquisition Date Oct. 07, 2022 Oct. 07, 2022    
Investment Maturity Date Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028  
Investment Owned, Balance, Principal Amount $ 6,416 $ 6,451    
Investment Owned, at Cost 6,368 6,392    
Investment Owned, at Fair Value $ 6,416 $ 6,420    
Fair Value As A Percentage of Member's Equity 18.90% 19.50%    
Investment, Identifier [Axis]: Maxor Acquisition, Inc. (d/b/a Maxor National Pharmacy Services, LLC) First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MaxorAcquisitionInc.Member whfcl:MaxorAcquisitionInc.Member    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00%  
Investment Interest Rate 9.98% 9.82% 9.98%  
Investment, Acquisition Date Dec. 27, 2024 Dec. 27, 2024    
Investment Maturity Date Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029  
Investment Owned, Balance, Principal Amount $ 933 $ 938    
Investment Owned, at Cost 927 930    
Investment Owned, at Fair Value $ 933 $ 942    
Percent of net assets 0.40% 0.40% 0.40%  
Investment, Identifier [Axis]: Maxor Acquisition, Inc. First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MaxorAcquisitionInc.Member whfcl:MaxorAcquisitionInc.Member    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00%  
Investment Interest Rate 9.98% 9.82% 9.98%  
Investment, Acquisition Date Apr. 11, 2023 Apr. 11, 2023    
Investment Maturity Date Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029  
Investment Owned, Balance, Principal Amount $ 4,925 $ 4,951    
Investment Owned, at Cost 4,860 4,872    
Investment Owned, at Fair Value $ 4,925 $ 4,974    
Fair Value As A Percentage of Member's Equity 14.50% 15.10%    
Investment, Identifier [Axis]: Maxor Acquisition, Inc.First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MaxorAcquisitionInc.Member whfcl:MaxorAcquisitionInc.Member    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00%  
Investment Interest Rate 9.98% 9.82% 9.98%  
Investment, Acquisition Date Apr. 11, 2023 Apr. 11, 2023    
Investment Maturity Date Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029  
Investment Owned, at Fair Value $ 6 $ 8    
Investment, Identifier [Axis]: Media Source, LLC (d/b/a Media Source Inc.) First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Media Source, LLC [Member] Media Source, LLC [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Education Services [Member] Education Services [Member] Education Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.44% 9.54% 9.44%  
Investment, Acquisition Date Sep. 01, 2025 Sep. 01, 2025    
Investment Maturity Date Aug. 30, 2030 Aug. 30, 2030 Aug. 30, 2030  
Investment Owned, Balance, Principal Amount $ 150      
Investment Owned, at Cost 147      
Investment Owned, at Fair Value $ 149 $ 17    
Investment, Interest Rate, Paid in Kind   4.77%    
Investment, Interest Rate, Paid in Cash   4.77%    
Percent of net assets 0.10%   0.10%  
Investment, Identifier [Axis]: Media Source, LLC (d/b/a Media Source Inc.) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Media Source, LLC [Member] Media Source, LLC [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Education Services [Member] Education Services [Member] Education Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.42% 9.54% 9.42%  
Investment, Acquisition Date Sep. 01, 2025 Sep. 01, 2025    
Investment Maturity Date Aug. 30, 2030 Aug. 30, 2030 Aug. 30, 2030  
Investment Owned, Balance, Principal Amount $ 4,323 $ 4,242    
Investment Owned, at Cost 4,323 4,242    
Investment Owned, at Fair Value $ 4,259 $ 4,242    
Investment, Interest Rate, Paid in Kind 4.71% 4.77% 4.71%  
Investment, Interest Rate, Paid in Cash 4.71% 4.77% 4.71%  
Percent of net assets 1.70% 1.60% 1.70%  
Investment, Identifier [Axis]: Merriman Holdings LP (d/b/a Escalent, Inc.) Class A Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MerrimanHoldingsLPMember whfcl:MerrimanHoldingsLPMember    
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services  
Investment, Acquisition Date Apr. 07, 2023 Apr. 07, 2023    
Investment Owned, Balance, Principal Amount $ 327 $ 327    
Investment Owned, at Cost 333 333    
Investment Owned, at Fair Value $ 286 $ 312    
Percent of net assets 0.10% 0.10% 0.10%  
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Term Loan Two        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:MetaBuyerLLCMember    
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Pharmaceuticals    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]    
Investment, Interest Rate, Floor   0.75%    
Spread Above Index   5.25%    
Investment Interest Rate   8.94%    
Investment, Acquisition Date   Dec. 22, 2025    
Investment Maturity Date   Dec. 22, 2031    
Investment Owned, Balance, Principal Amount   $ 6,720    
Investment Owned, at Cost   6,653    
Investment Owned, at Fair Value   $ 6,653    
Percent of net assets   2.60%    
Investment, Identifier [Axis]: Meta Buyer LLC, First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MetaBuyerLLCMember whfcl:MetaBuyerLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Personal Products Pharmaceuticals Personal Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 5.25% 5.25% 5.25%  
Investment Interest Rate 8.93% 8.94% 8.93%  
Investment, Acquisition Date Mar. 30, 2026 Dec. 22, 2025    
Investment Maturity Date Dec. 22, 2031 Dec. 22, 2031 Dec. 22, 2031  
Investment Owned, Balance, Principal Amount $ 1,607      
Investment Owned, at Cost 1,597      
Investment Owned, at Fair Value $ 1,599      
Fair Value As A Percentage of Member's Equity 4.70%      
Investment, Identifier [Axis]: Meta Buyer LLC, First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MetaBuyerLLCMember whfcl:MetaBuyerLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Personal Products Pharmaceuticals Personal Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 5.25% 5.25% 5.25%  
Investment Interest Rate 8.97% 8.94% 8.97%  
Investment, Acquisition Date Mar. 30, 2026 Dec. 22, 2025    
Investment Maturity Date Dec. 22, 2031 Dec. 22, 2031 Dec. 22, 2031  
Investment Owned, Balance, Principal Amount $ 340      
Investment Owned, at Cost 337      
Investment Owned, at Fair Value $ 342      
Fair Value As A Percentage of Member's Equity 1.00%      
Investment, Identifier [Axis]: Meta Buyer LLC, First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MetaBuyerLLCMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Personal Products   Personal Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.75%   0.75%  
Spread Above Index 5.25%   5.25%  
Investment Interest Rate 8.93%   8.93%  
Investment, Acquisition Date Feb. 04, 2026      
Investment Maturity Date Dec. 22, 2031   Dec. 22, 2031  
Investment Owned, Balance, Principal Amount $ 6,686      
Investment Owned, at Cost 6,625      
Investment Owned, at Fair Value $ 6,647      
Fair Value As A Percentage of Member's Equity 19.50%      
Investment, Identifier [Axis]: Meta Buyer LLC, First Lien Secured Term Loan One        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MetaBuyerLLCMember whfcl:MetaBuyerLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Personal Products Pharmaceuticals Personal Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Euro Interbank Offered Rate Three Month Term [Member] Euro Interbank Offered Rate Three Month Term [Member] Euro Interbank Offered Rate Three Month Term [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 5.25% 5.25% 5.25%  
Investment Interest Rate 7.33% 7.29% 7.33%  
Investment, Acquisition Date Feb. 04, 2026 Dec. 22, 2025    
Investment Maturity Date Dec. 22, 2031 Dec. 22, 2031 Dec. 22, 2031  
Investment Owned, Balance, Principal Amount   $ 4,621 € 4,609  
Investment Owned, at Cost $ 5,391 5,378    
Investment Owned, at Fair Value $ 5,234 $ 5,374    
Fair Value As A Percentage of Member's Equity 15.40%      
Percent of net assets   2.10%    
Investment, Identifier [Axis]: Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC) First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Midwest Texas Tea CA, LLC [Member] Midwest Texas Tea CA, LLC [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Oil and Gas, Refining and Marketing [Member] Oil and Gas, Refining and Marketing [Member] Oil and Gas, Refining and Marketing [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.50% 7.50%  
Investment Interest Rate 11.24% 11.32% 11.24%  
Investment, Acquisition Date Dec. 22, 2023 Dec. 22, 2023    
Investment Maturity Date Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028  
Investment Owned, Balance, Principal Amount $ 642 $ 639    
Investment Owned, at Cost 634 629    
Investment Owned, at Fair Value $ 644 $ 639    
Percent of net assets 0.30% 0.20% 0.30%  
Investment, Identifier [Axis]: Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC) First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Midwest Texas Tea CA, LLC [Member] Midwest Texas Tea CA, LLC [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Oil and Gas, Refining and Marketing [Member] Oil and Gas, Refining and Marketing [Member] Oil and Gas, Refining and Marketing [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.27% 7.50% 7.27%  
Investment Interest Rate 11.70% 11.32% 11.70%  
Investment, Acquisition Date Dec. 22, 2023 Dec. 22, 2023    
Investment Maturity Date Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028  
Investment Owned, Balance, Principal Amount $ 501 $ 572    
Investment Owned, at Cost 495 563    
Investment Owned, at Fair Value $ 502 $ 572    
Percent of net assets 0.20% 0.20% 0.20%  
Investment, Identifier [Axis]: Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Midwest Texas Tea CA, LLC [Member] Midwest Texas Tea CA, LLC [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Oil and Gas, Refining and Marketing [Member] Oil and Gas, Refining and Marketing [Member] Oil and Gas, Refining and Marketing [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.50% 7.50%  
Investment Interest Rate 11.24% 11.32% 11.24%  
Investment, Acquisition Date Dec. 22, 2023 Dec. 22, 2023    
Investment Maturity Date Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028  
Investment Owned, Balance, Principal Amount $ 9,232 $ 9,188    
Investment Owned, at Cost 9,119 9,051    
Investment Owned, at Fair Value $ 9,262 $ 9,193    
Percent of net assets 3.70% 3.50% 3.70%  
Investment, Identifier [Axis]: Monarch Collective Holdings, LLC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:MonarchCollectiveHoldingsLlcMember    
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Real Estate Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]    
Investment, Interest Rate, Floor   1.50%    
Spread Above Index   7.25%    
Investment Interest Rate   10.97%    
Investment, Acquisition Date   Jan. 10, 2024    
Investment Maturity Date   Jan. 10, 2029    
Investment Owned, Balance, Principal Amount   $ 1,579    
Investment Owned, at Cost   1,562    
Investment Owned, at Fair Value   $ 1,553    
Percent of net assets   0.60%    
Investment, Identifier [Axis]: Monarch Collective Holdings, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:MonarchCollectiveHoldingsLlcMember    
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Real Estate Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]    
Investment, Interest Rate, Floor   1.50%    
Spread Above Index   7.25%    
Investment Interest Rate   10.92%    
Investment, Acquisition Date   Jan. 10, 2024    
Investment Maturity Date   Jan. 10, 2029    
Investment Owned, Balance, Principal Amount   $ 9,212    
Investment Owned, at Cost   9,073    
Investment Owned, at Fair Value   $ 9,061    
Percent of net assets   3.50%    
Investment, Identifier [Axis]: Motivational CIV, LLC Class B Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MotivationalCIVLLCMember whfcl:MotivationalCIVLLCMember    
Investment, Type [Extensible Enumeration] whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Acquisition Date Jul. 12, 2021 Jul. 12, 2021    
Investment Owned, Balance, Principal Amount $ 1,250 $ 1,250    
Investment Owned, at Cost 1,250 1,250    
Investment Owned, at Fair Value $ 951 $ 774    
Percent of net assets 0.40% 0.30% 0.40%  
Investment, Identifier [Axis]: Motivational Marketing, LLC (d/b/a Motivational Fulfillment), LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MotivationalMarketingLLCMember whfcl:MotivationalMarketingLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Canadian Overnight Repo Rate Average Three Months Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.13% 10.48% 10.13%  
Investment, Acquisition Date Jul. 12, 2021 Jul. 12, 2021    
Investment Maturity Date Jul. 12, 2028 Jul. 12, 2028 Jul. 12, 2028  
Investment Owned, Balance, Principal Amount $ 945 $ 630    
Investment Owned, at Cost 940 626    
Investment Owned, at Fair Value $ 949 $ 637    
Percent of net assets 0.40% 0.20% 0.40%  
Investment, Identifier [Axis]: Motivational Marketing, LLC (d/b/a Motivational Fulfillment), LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:MotivationalMarketingLLCMember whfcl:MotivationalMarketingLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Base Rate [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.13% 10.37% 10.13%  
Investment, Acquisition Date Jul. 12, 2021 Jul. 12, 2021    
Investment Maturity Date Jul. 12, 2028 Jul. 12, 2028 Jul. 12, 2028  
Investment Owned, Balance, Principal Amount $ 13,109 $ 13,175    
Investment Owned, at Cost 13,052 13,104    
Investment Owned, at Fair Value $ 13,109 $ 13,135    
Percent of net assets 5.20% 5.00% 5.20%  
Investment, Identifier [Axis]: NM Z Holdco Inc First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:NmZHoldcoInc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Products   Household Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member]   Prime Rate [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 6.50%   6.50%  
Investment Interest Rate 13.25%   13.25%  
Investment, Acquisition Date Mar. 16, 2026      
Investment Maturity Date Jun. 30, 2031   Jun. 30, 2031  
Investment Owned, at Fair Value $ 6      
Investment, Interest Rate, Paid in Kind 2.50%   2.50%  
Investment, Interest Rate, Paid in Cash 10.75%   10.75%  
Investment, Identifier [Axis]: NM Z Holdco Inc. (d/b/a Zep, Inc.) First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] NM Z Holdco Inc Zep, Inc [Member] NM Z Holdco Inc Zep, Inc [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Products Household Products Household Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.00% 5.00% 5.00%  
Investment Interest Rate 8.73% 8.67% 8.73%  
Investment, Acquisition Date Mar. 16, 2026 Aug. 12, 2025    
Investment Maturity Date Jun. 30, 2031 Jun. 30, 2031 Jun. 30, 2031  
Investment Owned, at Fair Value $ 7 $ 6    
Investment, Identifier [Axis]: NM Z Holdco Inc. (d/b/a Zep, Inc.) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] NM Z Holdco Inc Zep, Inc [Member] NM Z Holdco Inc Zep, Inc [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Products Household Products Household Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.00% 5.00% 5.00%  
Investment Interest Rate 8.73% 8.67% 8.73%  
Investment, Acquisition Date Aug. 12, 2025 Aug. 12, 2025    
Investment Maturity Date Jun. 30, 2031 Jun. 30, 2031 Jun. 30, 2031  
Investment Owned, Balance, Principal Amount $ 10,336 $ 10,388    
Investment Owned, at Cost 10,250 10,293    
Investment Owned, at Fair Value $ 10,412 $ 10,378    
Fair Value As A Percentage of Member's Equity 30.60% 31.60%    
Investment, Identifier [Axis]: NNA Services, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:NNAServicesLLCMember whfcl:NNAServicesLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Education Services [Member] Education Services [Member] Education Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75%  
Investment Interest Rate 10.63% 10.57% 10.63%  
Investment, Acquisition Date Aug. 27, 2021 Aug. 27, 2021    
Investment Maturity Date Aug. 28, 2028 Aug. 27, 2026 Aug. 28, 2028  
Investment Owned, Balance, Principal Amount $ 7,927 $ 8,073    
Investment Owned, at Cost 7,922 8,060    
Investment Owned, at Fair Value $ 7,903 $ 8,037    
Percent of net assets 3.10% 3.10% 3.10%  
Investment, Identifier [Axis]: NPAV Lessor Corp. First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:NPAVLessorCorp.Member whfcl:NPAVLessorCorp.Member    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Real Estate Services Real Estate Services Real Estate Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.24% 10.32% 10.24%  
Investment, Acquisition Date Mar. 01, 2022 Mar. 01, 2022    
Investment Maturity Date Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027  
Investment Owned, Balance, Principal Amount $ 725 $ 725    
Investment Owned, at Cost 723 722    
Investment Owned, at Fair Value $ 678 $ 660    
Fair Value As A Percentage of Member's Equity 2.00% 2.00%    
Investment, Identifier [Axis]: NPAV Lessor Corp. First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:NPAVLessorCorp.Member whfcl:NPAVLessorCorp.Member    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Real Estate Services Real Estate Services Real Estate Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.24% 10.32% 10.24%  
Investment, Acquisition Date Mar. 01, 2022 Mar. 01, 2022    
Investment Maturity Date Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027  
Investment Owned, Balance, Principal Amount $ 5,314 $ 5,517    
Investment Owned, at Cost 5,302 5,493    
Investment Owned, at Fair Value $ 4,969 $ 5,022    
Fair Value As A Percentage of Member's Equity 14.60% 15.30%    
Investment, Identifier [Axis]: New American Crafts Holdings, LLC Class A Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:NewAmericanCraftsHoldingsLlcMember    
Investment, Type [Extensible Enumeration]   whfcl:ClassAUnitsMember    
Investment, Identifier [Axis]: Oil amp; Gas Storage amp; Transportation First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:IslandEnergyServicesLlcMember    
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Oil and Gas Storage and Transportation [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]    
Investment, Interest Rate, Floor   0.50%    
Spread Above Index   5.75%    
Investment Interest Rate   9.64%    
Investment, Acquisition Date   Jul. 16, 2025    
Investment Maturity Date   Jul. 16, 2032    
Investment Owned, Balance, Principal Amount   $ 10,472    
Investment Owned, at Cost   10,077    
Investment Owned, at Fair Value   $ 10,158    
Percent of net assets   3.90%    
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Panos Brands, Llc [Member] Panos Brands, Llc [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Prime Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.75% 5.75% 4.75%  
Investment Interest Rate 8.66% 9.48% 8.66%  
Investment, Acquisition Date Jun. 14, 2024 May 14, 2024    
Investment Maturity Date May 14, 2029 May 14, 2029 May 14, 2029  
Investment Owned, Balance, Principal Amount $ 61      
Investment Owned, at Cost 60      
Investment Owned, at Fair Value $ 66 $ 6    
Fair Value As A Percentage of Member's Equity 0.20%      
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Revolving Loan One        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Panos Brands, Llc [Member] Panos Brands, Llc [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Prime Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.75% 5.75% 4.75%  
Investment Interest Rate 11.50% 9.48% 11.50%  
Investment, Acquisition Date May 14, 2024 Jun. 14, 2024    
Investment Maturity Date May 14, 2029 May 14, 2029 May 14, 2029  
Investment Owned, Balance, Principal Amount $ 55      
Investment Owned, at Cost 54      
Investment Owned, at Fair Value $ 59 $ 6    
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Panos Brands, Llc [Member]      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats   Packaged Foods & Meats  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member]   Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 5.75%   5.75%  
Investment Interest Rate 8.66%   8.66%  
Investment, Acquisition Date Jun. 14, 2024      
Investment Maturity Date May 14, 2029   May 14, 2029  
Investment Owned, Balance, Principal Amount $ 3,963      
Investment Owned, at Cost 3,918      
Investment Owned, at Fair Value $ 3,963      
Fair Value As A Percentage of Member's Equity 11.60%      
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Term Loan One        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Panos Brands, Llc [Member] Panos Brands, Llc [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.39% 9.48% 9.39%  
Investment, Acquisition Date May 14, 2024 Jun. 14, 2024    
Investment Maturity Date May 14, 2029 May 14, 2029 May 14, 2029  
Investment Owned, Balance, Principal Amount $ 3,567 $ 4,475    
Investment Owned, at Cost 3,526 4,414    
Investment Owned, at Fair Value $ 3,567 $ 4,475    
Fair Value As A Percentage of Member's Equity   13.50%    
Percent of net assets 1.40%   1.40%  
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Term Loan, One 05/14/29        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   Panos Brands, Llc [Member]    
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Packaged Foods & Meats    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) One Month Term [Member]    
Investment, Interest Rate, Floor   1.00%    
Spread Above Index   5.75%    
Investment Interest Rate   9.48%    
Investment, Acquisition Date   May 14, 2024    
Investment Maturity Date   May 14, 2029    
Investment Owned, Balance, Principal Amount   $ 4,027    
Investment Owned, at Cost   3,973    
Investment Owned, at Fair Value   $ 4,027    
Percent of net assets   1.60%    
Investment, Identifier [Axis]: PFB Holding Company, LLC Class A Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:PfbHoldingCompanyLlcMember whfcl:PFBHoldcoIncMember    
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products  
Investment, Acquisition Date Dec. 17, 2021 Dec. 17, 2021    
Investment Owned, Balance, Principal Amount $ 1 $ 1    
Investment Owned, at Cost $ 24 $ 24    
Investment, Identifier [Axis]: PGI Parent LLC (d/b/a Prime Electric, Inc.), First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:PgiParentLlcMember    
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]    
Investment, Interest Rate, Floor   1.00%    
Spread Above Index   5.00%    
Investment Interest Rate   8.67%    
Investment, Acquisition Date   Dec. 31, 2025    
Investment Maturity Date   Dec. 31, 2031    
Investment, Identifier [Axis]: PGI Parent LLC (d/b/a Prime Electric, Inc.), First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:PgiParentLlcMember    
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]    
Investment, Interest Rate, Floor   1.00%    
Spread Above Index   5.00%    
Investment Interest Rate   8.67%    
Investment, Acquisition Date   Dec. 31, 2025    
Investment Maturity Date   Dec. 31, 2031    
Investment Owned, Balance, Principal Amount   $ 5,077    
Investment Owned, at Cost   5,026    
Investment Owned, at Fair Value   $ 5,026    
Percent of net assets   1.90%    
Investment, Identifier [Axis]: PGI Parent LLC, First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:PgiParentLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering   Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member]   Prime Rate [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 4.00%   4.00%  
Investment Interest Rate 10.75%   10.75%  
Investment, Acquisition Date Jan. 16, 2026      
Investment Maturity Date Dec. 31, 2031   Dec. 31, 2031  
Investment Owned, Balance, Principal Amount $ 375      
Investment Owned, at Cost 372      
Investment Owned, at Fair Value $ 376      
Fair Value As A Percentage of Member's Equity 1.10%      
Investment, Identifier [Axis]: PGI Parent LLC, First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:PgiParentLlcMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering   Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 5.00%   5.00%  
Investment Interest Rate 8.73%   8.73%  
Investment, Acquisition Date Jan. 16, 2026      
Investment Maturity Date Dec. 31, 2031   Dec. 31, 2031  
Investment Owned, Balance, Principal Amount $ 5,052      
Investment Owned, at Cost 5,005      
Investment Owned, at Fair Value $ 5,027      
Fair Value As A Percentage of Member's Equity 14.80%      
Investment, Identifier [Axis]: Patagonia Holdco LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:PatagoniaHoldcoLLCMember    
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Integrated Telecommunication Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]    
Investment, Interest Rate, Floor   0.50%    
Spread Above Index   5.75%    
Investment Interest Rate   9.62%    
Investment, Acquisition Date   Aug. 05, 2022    
Investment Maturity Date   Aug. 01, 2029    
Investment Owned, Balance, Principal Amount   $ 14,150    
Investment Owned, at Cost   12,839    
Investment Owned, at Fair Value   $ 11,603    
Percent of net assets   4.50%    
Investment, Identifier [Axis]: Pirtek Holdco, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:PirtekHoldcoLLCMember whfcl:PirtekHoldcoLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Base Rate [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.50% 4.50% 4.50%  
Investment Interest Rate 8.17% 8.20% 8.17%  
Investment, Acquisition Date Oct. 31, 2023 Oct. 31, 2023    
Investment Maturity Date Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028  
Investment Owned, at Fair Value $ 10 $ 9    
Investment, Identifier [Axis]: Pirtek Holdco, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:PirtekHoldcoLLCMember whfcl:PirtekHoldcoLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Base Rate [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.50% 4.50% 4.50%  
Investment Interest Rate 8.17% 8.20% 8.17%  
Investment, Acquisition Date Oct. 31, 2023 Oct. 31, 2023    
Investment Maturity Date Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028  
Investment Owned, Balance, Principal Amount $ 12,247 $ 12,389    
Investment Owned, at Cost 12,162 12,284    
Investment Owned, at Fair Value $ 12,247 $ 12,332    
Fair Value As A Percentage of Member's Equity 36.00% 37.50%    
Investment, Identifier [Axis]: Playmonster Group Equity Inc Common Equity        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:PlaymonsterGroupEquityIncMember      
Investment, Type [Extensible Enumeration] Common Stock [Member]   Common Stock [Member]  
Investment, Identifier [Axis]: Playmonster Group Equity Inc Preferred Equity        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:PlaymonsterGroupEquityIncMember      
Investment, Type [Extensible Enumeration] us-gaap:PreferredStockMember   us-gaap:PreferredStockMember  
Investment, Identifier [Axis]: Playmonster Group Equity, Inc Common Stock        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:PlaymonsterGroupEquityIncMember whfcl:PlaymonsterGroupEquityIncMember    
Investment, Type [Extensible Enumeration] Common Stock [Member] Common Stock [Member] Common Stock [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products  
Investment, Acquisition Date Jan. 24, 2022 Jan. 24, 2022    
Investment Owned, Balance, Principal Amount $ 72 $ 72    
Investment Owned, at Cost $ 460 $ 460    
Investment, Identifier [Axis]: Playmonster Group Equity, Inc. Preferred Stock        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:PlaymonsterGroupEquityIncMember whfcl:PlaymonsterGroupEquityIncMember    
Investment, Type [Extensible Enumeration] us-gaap:PreferredStockMember us-gaap:PreferredStockMember us-gaap:PreferredStockMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products  
Investment, Acquisition Date Jan. 24, 2022 Jan. 24, 2022    
Investment Owned, Balance, Principal Amount $ 36 $ 36    
Investment Owned, at Cost $ 3,600 $ 3,600    
Investment, Identifier [Axis]: Playmonster Group LLC, First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:PlaymonsterGroupLLCMember whfcl:PlaymonsterGroupLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 9.00% 9.00% 9.00%  
Investment, Acquisition Date Jun. 07, 2021 Jun. 07, 2021    
Investment Maturity Date Jun. 29, 2028 Jun. 08, 2026 Jun. 29, 2028  
Investment Owned, Balance, Principal Amount $ 5,964 $ 5,595    
Investment Owned, at Cost 3,661 3,661    
Investment Owned, at Fair Value $ 2,426 $ 1,729   1,635
Investment, Interest Rate, Paid in Kind 12.81% 12.99% 12.81%  
Percent of net assets 1.00% 0.70% 1.00%  
Investment, Identifier [Axis]: Playmonster Group LLC, Priority First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:PlaymonsterGroupLLCMember whfcl:PlaymonsterGroupLLCMember    
Investment, Type [Extensible Enumeration] whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.72% 6.75% 6.72%  
Investment, Acquisition Date Dec. 09, 2022 Dec. 09, 2022    
Investment Maturity Date Jun. 29, 2028 Jun. 08, 2026 Jun. 29, 2028  
Investment Owned, Balance, Principal Amount $ 1,592 $ 1,442    
Investment Owned, at Cost 1,589 1,438    
Investment Owned, at Fair Value $ 1,592 $ 1,355   1,172
Investment, Interest Rate, Paid in Kind 10.10% 10.74% 10.10%  
Percent of net assets 0.60% 0.50% 0.60%  
Investment, Identifier [Axis]: Pressurized Holdings, LLC Common Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:PressurizedHoldingsLlcMember whfcl:PressurizedHoldingsLlcMember    
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Chemicals [Member] Diversified Chemicals [Member] Diversified Chemicals [Member]  
Investment, Acquisition Date Mar. 16, 2023 Mar. 16, 2023    
Investment Owned, at Fair Value $ 1,944      
Percent of net assets 0.80%   0.80%  
Investment, Identifier [Axis]: Pressurized Holdings, LLC Preferred Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:PressurizedHoldingsLlcMember whfcl:PressurizedHoldingsLlcMember    
Investment, Type [Extensible Enumeration] whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Chemicals [Member] Diversified Chemicals [Member] Diversified Chemicals [Member]  
Investment, Acquisition Date Mar. 16, 2023 Mar. 16, 2023    
Investment Owned, at Cost $ 4,537 $ 4,537    
Investment Owned, at Fair Value $ 8,294 $ 4,784   1,657
Percent of net assets 3.30% 1.80% 3.30%  
Investment, Identifier [Axis]: Principal Lighting Group, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:PrincipalLightingGroupLlcMember whfcl:PrincipalLightingGroupLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Electrical Components & Equipment Electrical Components & Equipment Electrical Components & Equipment  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.25% 5.25% 5.25%  
Investment Interest Rate 8.92% 8.96% 8.92%  
Investment, Acquisition Date Dec. 03, 2024 Dec. 03, 2024    
Investment Maturity Date Nov. 04, 2030 Nov. 04, 2030 Nov. 04, 2030  
Investment Owned, at Fair Value $ 5 $ 4    
Investment, Identifier [Axis]: Principal Lighting Group, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:PrincipalLightingGroupLlcMember whfcl:PrincipalLightingGroupLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Electrical Components & Equipment Electrical Components & Equipment Electrical Components & Equipment  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.25% 5.25% 5.25%  
Investment Interest Rate 8.92% 8.96% 8.92%  
Investment, Acquisition Date Dec. 03, 2024 Dec. 03, 2024    
Investment Maturity Date Nov. 04, 2030 Nov. 04, 2030 Nov. 04, 2030  
Investment Owned, Balance, Principal Amount $ 3,278 $ 3,353    
Investment Owned, at Cost 3,242 3,312    
Investment Owned, at Fair Value $ 3,278 $ 3,343    
Fair Value As A Percentage of Member's Equity 9.60% 10.20%    
Investment, Identifier [Axis]: Quest Events, LLC Common Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Quest Events, LLC [Member] Quest Events, LLC [Member]    
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Acquisition Date Dec. 28, 2018 Dec. 28, 2018    
Investment Owned, Balance, Principal Amount $ 402 $ 385    
Investment Owned, at Cost $ 402 $ 385    
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Quest Events, LLC [Member] Quest Events, LLC [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.50% 7.50%  
Investment Interest Rate 11.43% 11.48% 11.43%  
Investment, Acquisition Date Mar. 21, 2025 Mar. 21, 2025    
Investment Maturity Date Sep. 30, 2027 Sep. 30, 2027 Sep. 30, 2027  
Investment Owned, Balance, Principal Amount $ 129 $ 124    
Investment Owned, at Cost 128 122    
Investment Owned, at Fair Value $ 130 $ 113    
Percent of net assets 0.10%   0.10%  
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Revolving Loan One        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Quest Events, LLC [Member] Quest Events, LLC [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.50% 7.50%  
Investment Interest Rate 11.43% 11.48% 11.43%  
Investment, Acquisition Date Jul. 19, 2019 Jul. 19, 2019    
Investment Maturity Date Sep. 30, 2027 Sep. 30, 2027 Sep. 30, 2027  
Investment Owned, Balance, Principal Amount $ 300 $ 288    
Investment Owned, at Cost 300 288    
Investment Owned, at Fair Value $ 300 $ 262    
Fair Value As A Percentage of Member's Equity 0.90% 0.80%    
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Quest Events, LLC [Member] Quest Events, LLC [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75%  
Investment Interest Rate 10.41% 10.48% 10.41%  
Investment, Acquisition Date Sep. 13, 2024 Sep. 13, 2024    
Investment Maturity Date Sep. 30, 2027 Sep. 30, 2027 Sep. 30, 2027  
Investment Owned, Balance, Principal Amount $ 1,281 $ 1,270    
Investment Owned, at Cost 1,272 1,258    
Investment Owned, at Fair Value $ 1,281 $ 1,187    
Percent of net assets 0.50% 0.50% 0.50%  
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Term Loan One        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Quest Events, LLC [Member] Quest Events, LLC [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 2.00% 2.00% 2.00%  
Spread Above Index 7.50% 7.50% 7.50%  
Investment Interest Rate 11.43% 11.48% 11.43%  
Investment, Acquisition Date Jul. 19, 2019 Jul. 19, 2019    
Investment Maturity Date Sep. 30, 2027 Sep. 30, 2027 Sep. 30, 2027  
Investment Owned, Balance, Principal Amount $ 11,806 $ 11,668    
Investment Owned, at Cost 11,797 11,655    
Investment Owned, at Fair Value $ 11,806 $ 11,041    
Fair Value As A Percentage of Member's Equity 34.70% 33.50%    
Investment, Identifier [Axis]: RCKC Acquisitions LLC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:RCKCAcquisitionsLLCMember whfcl:RCKCAcquisitionsLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.31% 9.49% 9.31%  
Investment, Acquisition Date Jan. 27, 2021 Jan. 27, 2021    
Investment Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029  
Investment Owned, Balance, Principal Amount $ 2,901 $ 2,916    
Investment Owned, at Cost 2,886 2,898    
Investment Owned, at Fair Value $ 2,784 $ 2,827    
Fair Value As A Percentage of Member's Equity 8.20% 8.60%    
Investment, Identifier [Axis]: RCKC Acquisitions LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:RCKCAcquisitionsLLCMember whfcl:RCKCAcquisitionsLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.31% 9.49% 9.31%  
Investment, Acquisition Date Jan. 27, 2021 Jan. 27, 2021    
Investment Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029  
Investment Owned, at Fair Value $ (50) $ (35)    
Fair Value As A Percentage of Member's Equity (0.10%) (0.10%)    
Investment, Identifier [Axis]: RCKC Acquisitions LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:RCKCAcquisitionsLLCMember whfcl:RCKCAcquisitionsLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.38% 9.32% 9.38%  
Investment, Acquisition Date Jan. 27, 2021 Jan. 27, 2021    
Investment Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029  
Investment Owned, Balance, Principal Amount $ 10,752 $ 10,809    
Investment Owned, at Cost 10,700 10,747    
Investment Owned, at Fair Value $ 10,321 $ 10,481    
Fair Value As A Percentage of Member's Equity 30.30% 31.90%    
Investment, Identifier [Axis]: RLJ Pro-Vac, Inc. First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:RLJPro-VacInc.Member whfcl:RLJPro-VacInc.Member    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.25% 6.75% 7.25%  
Investment Interest Rate 10.99% 10.72% 10.99%  
Investment, Acquisition Date Jan. 23, 2024 Jan. 23, 2024    
Investment Maturity Date Jan. 03, 2028 Dec. 31, 2026 Jan. 03, 2028  
Investment Owned, Balance, Principal Amount $ 6,573 $ 6,592    
Investment Owned, at Cost 6,540 6,546    
Investment Owned, at Fair Value $ 6,409 $ 6,396    
Investment, Interest Rate, Paid in Kind 0.50%   0.50%  
Investment, Interest Rate, Paid in Cash 10.49%   10.49%  
Fair Value As A Percentage of Member's Equity 18.80% 19.50%    
Investment, Identifier [Axis]: Rewards Network Inc. First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:RewardsNetworkInc.Member whfcl:RewardsNetworkInc.Member    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Finance [Member] Specialized Finance [Member] Specialized Finance [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 6.00% 6.00% 6.00%  
Investment Interest Rate 9.65% 9.76% 9.65%  
Investment, Acquisition Date Dec. 05, 2025 Dec. 05, 2025    
Investment Maturity Date Dec. 05, 2031 Dec. 05, 2031 Dec. 05, 2031  
Investment Owned, at Fair Value $ 20      
Investment, Identifier [Axis]: Rewards Network Inc. First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:RewardsNetworkInc.Member whfcl:RewardsNetworkInc.Member    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Finance [Member] Specialized Finance [Member] Specialized Finance [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Prime Rate [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 5.00% 6.00% 5.00%  
Investment Interest Rate 11.75% 9.82% 11.75%  
Investment, Acquisition Date Dec. 05, 2025 Dec. 05, 2025    
Investment Maturity Date Dec. 05, 2031 Dec. 05, 2031 Dec. 05, 2031  
Investment Owned, Balance, Principal Amount $ 160 $ 638    
Investment Owned, at Cost 157 627    
Investment Owned, at Fair Value $ 178 $ 627    
Percent of net assets 0.10% 0.20% 0.10%  
Investment, Identifier [Axis]: Rewards Network Inc. First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:RewardsNetworkInc.Member whfcl:RewardsNetworkInc.Member    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Finance [Member] Specialized Finance [Member] Specialized Finance [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%  
Spread Above Index 6.00% 6.00% 6.00%  
Investment Interest Rate 9.65% 9.76% 9.65%  
Investment, Acquisition Date Dec. 05, 2025 Dec. 05, 2025    
Investment Maturity Date Dec. 05, 2031 Dec. 05, 2031 Dec. 05, 2031  
Investment Owned, Balance, Principal Amount $ 10,187 $ 10,213    
Investment Owned, at Cost 10,026 10,036    
Investment Owned, at Fair Value $ 10,109 $ 10,034    
Percent of net assets 4.00% 3.90% 4.00%  
Investment, Identifier [Axis]: Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.) First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Ribbon Communications Operating Company, Inc. [Member] Ribbon Communications Operating Company, Inc. [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Prime Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25%  
Investment Interest Rate 9.89% 9.97% 9.89%  
Investment, Acquisition Date Jun. 21, 2024 Jun. 21, 2024    
Investment Maturity Date Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029  
Investment Owned, at Fair Value $ 8 $ 12    
Investment, Identifier [Axis]: Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Ribbon Communications Operating Company, Inc. [Member] Ribbon Communications Operating Company, Inc. [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25%  
Investment Interest Rate 9.89% 9.97% 9.89%  
Investment, Acquisition Date Jun. 21, 2024 Jun. 21, 2024    
Investment Maturity Date Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029  
Investment Owned, Balance, Principal Amount $ 8,492 $ 8,602    
Investment Owned, at Cost 8,392 8,483    
Investment Owned, at Fair Value $ 8,470 $ 8,631    
Percent of net assets 3.30% 3.30% 3.30%  
Investment, Identifier [Axis]: Ross-Simons Topco, LP Preferred Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:Ross-SimonsTopcoLPMember whfcl:Ross-SimonsTopcoLPMember    
Investment, Type [Extensible Enumeration] whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Other Specialty Retail [Member] Other Specialty Retail [Member] Other Specialty Retail [Member]  
Investment, Acquisition Date Dec. 04, 2020 Dec. 04, 2020    
Investment Owned, Balance, Principal Amount $ 600 $ 600    
Investment Owned, at Cost 514 514    
Investment Owned, at Fair Value $ 625 $ 735    
Percent of net assets 0.20% 0.30% 0.20%  
Investment, Identifier [Axis]: SCIC Buyer, Inc. First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ScicBuyerInc.Member whfcl:ScicBuyerInc.Member    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.75% 4.75% 4.75%  
Investment Interest Rate 8.48% 8.42% 8.48%  
Investment, Acquisition Date Jun. 04, 2025 Jun. 04, 2025    
Investment Maturity Date Mar. 28, 2031 Mar. 28, 2031 Mar. 28, 2031  
Investment Owned, Balance, Principal Amount   $ 295    
Investment Owned, at Cost   293    
Investment Owned, at Fair Value $ 27 $ 319    
Fair Value As A Percentage of Member's Equity 0.10% 1.00%    
Investment, Identifier [Axis]: SCIC Buyer, Inc. First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ScicBuyerInc.Member whfcl:ScicBuyerInc.Member    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.75% 4.75% 4.75%  
Investment Interest Rate 8.48% 8.42% 8.48%  
Investment, Acquisition Date Jun. 04, 2025 Jun. 04, 2025    
Investment Maturity Date Mar. 28, 2031 Mar. 28, 2031 Mar. 28, 2031  
Investment Owned, at Fair Value $ 23 $ 25    
Fair Value As A Percentage of Member's Equity 0.10% 0.10%    
Investment, Identifier [Axis]: SCIC Buyer, Inc. First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ScicBuyerInc.Member whfcl:ScicBuyerInc.Member    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.75% 4.75% 4.75%  
Investment Interest Rate 8.48% 8.42% 8.48%  
Investment, Acquisition Date Jun. 04, 2025 Jun. 04, 2025    
Investment Maturity Date Mar. 28, 2031 Mar. 28, 2031 Mar. 28, 2031  
Investment Owned, Balance, Principal Amount $ 9,045 $ 9,090    
Investment Owned, at Cost 8,936 8,970    
Investment Owned, at Fair Value $ 9,135 $ 9,142    
Fair Value As A Percentage of Member's Equity 26.80% 27.80%    
Investment, Identifier [Axis]: Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC) First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:SalonRepublicHoldingsLlcMember whfcl:SalonRepublicHoldingsLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00%  
Investment Interest Rate 11.74% 11.82% 11.74%  
Investment, Acquisition Date Dec. 02, 2022 Dec. 02, 2022    
Investment Maturity Date Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027  
Investment Owned, Balance, Principal Amount $ 1,643 $ 1,652    
Investment Owned, at Cost 1,634 1,637    
Investment Owned, at Fair Value $ 1,642 $ 1,653    
Percent of net assets 0.60% 0.60% 0.60%  
Investment, Identifier [Axis]: Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC) First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:SalonRepublicHoldingsLlcMember whfcl:SalonRepublicHoldingsLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00%  
Investment Interest Rate 11.74% 11.82% 11.74%  
Investment, Acquisition Date Dec. 02, 2022 Dec. 02, 2022    
Investment Maturity Date Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027  
Investment Owned, at Fair Value $ 7 $ 8    
Investment, Identifier [Axis]: Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:SalonRepublicHoldingsLlcMember whfcl:SalonRepublicHoldingsLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00%  
Investment Interest Rate 11.74% 11.82% 11.74%  
Investment, Acquisition Date Dec. 02, 2022 Dec. 02, 2022    
Investment Maturity Date Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027  
Investment Owned, Balance, Principal Amount $ 5,009 $ 5,032    
Investment Owned, at Cost 4,967 4,974    
Investment Owned, at Fair Value $ 5,008 $ 5,021    
Percent of net assets 2.00% 1.90% 2.00%  
Investment, Identifier [Axis]: Salon Republic Investments LLC Common Stock        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:SalonRepublicInvestmentsLlcMember whfcl:SalonRepublicInvestmentsLlcMember    
Investment, Type [Extensible Enumeration] Common Stock [Member] Common Stock [Member] Common Stock [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]  
Investment, Acquisition Date Dec. 02, 2022 Dec. 02, 2022    
Investment Owned, Balance, Principal Amount $ 400 $ 400    
Investment Owned, at Cost $ 400 400    
Investment Owned, at Fair Value   $ 6    
Investment, Identifier [Axis]: Salon Republic Investments LLC Preferred Stock        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:SalonRepublicInvestmentsLlcMember whfcl:SalonRepublicInvestmentsLlcMember    
Investment, Type [Extensible Enumeration] us-gaap:PreferredStockMember us-gaap:PreferredStockMember us-gaap:PreferredStockMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]  
Investment, Acquisition Date Dec. 02, 2022 Dec. 02, 2022    
Investment Owned, Balance, Principal Amount $ 200 $ 200    
Investment Owned, at Cost 200 200    
Investment Owned, at Fair Value $ 235 $ 265    
Percent of net assets 0.10% 0.10% 0.10%  
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:SleepOpCoLLCMember whfcl:SleepOpCoLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Home Furnishings [Member] Home Furnishings [Member] Home Furnishings [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.15% 9.37% 9.15%  
Investment, Acquisition Date Nov. 07, 2025 Nov. 07, 2025    
Investment Maturity Date Nov. 07, 2030 Nov. 07, 2030 Nov. 07, 2030  
Investment Owned, at Fair Value $ 20      
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:SleepOpCoLLCMember whfcl:SleepOpCoLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Home Furnishings [Member] Home Furnishings [Member] Home Furnishings [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.15% 9.37% 9.15%  
Investment, Acquisition Date Nov. 07, 2025 Nov. 07, 2025    
Investment Maturity Date Nov. 07, 2030 Nov. 07, 2030 Nov. 07, 2030  
Investment Owned, Balance, Principal Amount $ 13,388 $ 13,455    
Investment Owned, at Cost 13,213 13,259    
Investment Owned, at Fair Value $ 13,393 $ 13,255    
Percent of net assets 5.30% 5.10% 5.30%  
Investment, Identifier [Axis]: Smalto Inc, First Lien Secured Term Loan One        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:SmaltoInc.Member whfcl:SmaltoInc.Member    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75%  
Investment Interest Rate 9.63% 9.57% 9.63%  
Investment, Acquisition Date May 04, 2022 May 04, 2022    
Investment Maturity Date Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028  
Investment Owned, Balance, Principal Amount $ 944 $ 944    
Investment Owned, at Cost 938 936    
Investment Owned, at Fair Value $ 944 $ 944    
Fair Value As A Percentage of Member's Equity 2.80% 2.90%    
Investment, Identifier [Axis]: Smalto Inc. First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:SmaltoInc.Member whfcl:SmaltoInc.Member    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Euro Interbank Offered Rate Three Month Term [Member] Euro Interbank Offered Rate One Month Term [Member] Euro Interbank Offered Rate Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00%  
Investment Interest Rate 8.29% 7.90% 8.29%  
Investment, Acquisition Date May 04, 2022 May 04, 2022    
Investment Maturity Date Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028  
Investment Owned, Balance, Principal Amount   $ 6,198 € 6,198  
Investment Owned, at Cost $ 6,489 6,480    
Investment Owned, at Fair Value $ 7,080 $ 7,281    
Fair Value As A Percentage of Member's Equity 20.80% 22.10%    
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Class A Common Stock        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:SnapFitnessHoldingsIncMember whfcl:SnapFitnessHoldingsIncMember    
Investment, Type [Extensible Enumeration] us-gaap:CommonClassAMember us-gaap:CommonClassAMember us-gaap:CommonClassAMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]  
Investment, Acquisition Date Jun. 29, 2020 Jun. 29, 2020    
Investment Owned, Balance, Principal Amount $ 2 $ 2    
Investment Owned, at Cost 1,941 1,941    
Investment Owned, at Fair Value $ 434 $ 507    
Percent of net assets 0.20% 0.20% 0.20%  
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc First Lien Secured Term Loan C        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:SnapFitnessHoldingsIncMember whfcl:SnapFitnessHoldingsIncMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanCMember whfcl:FirstLienSecuredTermLoanCMember whfcl:FirstLienSecuredTermLoanCMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]  
Investment, Acquisition Date Jun. 29, 2020 Jun. 29, 2020    
Investment Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026  
Investment Owned, Balance, Principal Amount $ 2,199 $ 2,098    
Investment Owned, at Cost 2,196 2,095    
Investment Owned, at Fair Value $ 2,199 $ 2,098    
Investment, Interest Rate, Paid in Kind   9.50%    
Percent of net assets 0.90% 0.80% 0.90%  
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Warrants        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:SnapFitnessHoldingsIncMember whfcl:SnapFitnessHoldingsIncMember    
Investment, Type [Extensible Enumeration] Warrant [Member] Warrant [Member] Warrant [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]  
Investment, Acquisition Date Jun. 29, 2020 Jun. 29, 2020    
Investment Owned, Balance, Principal Amount $ 1 $ 1    
Investment Owned, at Cost 793 793    
Investment Owned, at Fair Value $ 176 $ 205    
Percent of net assets 0.10% 0.10% 0.10%  
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:SourceCodeHoldingsLLCMember whfcl:SourceCodeHoldingsLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.24% 10.32% 10.24%  
Investment, Acquisition Date Aug. 10, 2021 Aug. 10, 2021    
Investment Maturity Date Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027  
Investment Owned, Balance, Principal Amount $ 3,785 $ 3,831    
Investment Owned, at Cost 3,771 3,811    
Investment Owned, at Fair Value $ 3,748 $ 3,831    
Fair Value As A Percentage of Member's Equity 11.00% 11.70%    
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:SourceCodeHoldingsLLCMember whfcl:SourceCodeHoldingsLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.24% 10.32% 10.24%  
Investment, Acquisition Date Aug. 10, 2021 Aug. 10, 2021    
Investment Maturity Date Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027  
Investment Owned, Balance, Principal Amount $ 13,837 $ 14,009    
Investment Owned, at Cost 13,788 13,935    
Investment Owned, at Fair Value $ 13,703 $ 14,009    
Fair Value As A Percentage of Member's Equity 40.30% 42.60%    
Investment, Identifier [Axis]: Sterling Pure Blocker, LLC (d/b/a Banner Industries, Inc.) Class B Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:SterlingPureBlockerLlcMember whfcl:SterlingPureBlockerLlcMember    
Investment, Type [Extensible Enumeration] whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Acquisition Date Dec. 01, 2023 Dec. 01, 2023    
Investment Owned, Balance, Principal Amount $ 404 $ 404    
Investment Owned, at Cost 404 404    
Investment Owned, at Fair Value $ 247 $ 57    
Percent of net assets 0.10%   0.10%  
Investment, Identifier [Axis]: Surge Amuze Holdings Inc. First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Surge Amuze Holdings Inc [Member] Surge Amuze Holdings Inc [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25%  
Investment Interest Rate 9.89% 9.99% 9.89%  
Investment, Acquisition Date Sep. 06, 2024 Sep. 06, 2024    
Investment Maturity Date Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029  
Investment Owned, Balance, Principal Amount $ 2,835 $ 1,002    
Investment Owned, at Cost 2,792 987    
Investment Owned, at Fair Value $ 2,850 $ 1,000    
Percent of net assets 1.10% 0.40% 1.10%  
Investment, Identifier [Axis]: Surge Amuze Holdings Inc. First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Surge Amuze Holdings Inc [Member] Surge Amuze Holdings Inc [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.03% 5.90% 6.03%  
Investment Interest Rate 10.34% 10.82% 10.34%  
Investment, Acquisition Date Sep. 06, 2024 Sep. 06, 2024    
Investment Maturity Date Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029  
Investment Owned, Balance, Principal Amount $ 732 $ 451    
Investment Owned, at Cost 722 444    
Investment Owned, at Fair Value $ 732 $ 450    
Percent of net assets 0.30% 0.20% 0.30%  
Investment, Identifier [Axis]: Surge Amuze Holdings Inc. First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Surge Amuze Holdings Inc [Member] Surge Amuze Holdings Inc [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25%  
Investment Interest Rate 9.90% 9.99% 9.90%  
Investment, Acquisition Date Sep. 06, 2024 Sep. 06, 2024    
Investment Maturity Date Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029  
Investment Owned, Balance, Principal Amount $ 5,651 $ 5,679    
Investment Owned, at Cost 5,579 5,596    
Investment Owned, at Fair Value $ 5,649 $ 5,645    
Percent of net assets 2.20% 2.20% 2.20%  
Investment, Identifier [Axis]: TOT Group, Inc. (d/b/a Netevia Group LLC) First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Tot Group, Inc. [Member] Tot Group, Inc. [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.25% 7.50%  
Investment Interest Rate 11.23% 10.92% 11.23%  
Investment, Acquisition Date Jun. 28, 2024 Jun. 28, 2024    
Investment Maturity Date Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029  
Investment Owned, Balance, Principal Amount $ 1,099 $ 1,103    
Investment Owned, at Cost 1,083 1,084    
Investment Owned, at Fair Value $ 1,103 $ 1,091    
Percent of net assets 0.40% 0.40% 0.40%  
Investment, Identifier [Axis]: TOT Group, Inc. (d/b/a Netevia Group LLC) First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Tot Group, Inc. [Member] Tot Group, Inc. [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.25% 7.50%  
Investment Interest Rate 11.23% 10.92% 11.23%  
Investment, Acquisition Date Jun. 28, 2024 Jun. 28, 2024    
Investment Maturity Date Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029  
Investment Owned, at Fair Value $ 7 $ 1    
Investment, Identifier [Axis]: TOT Group, Inc. (d/b/a Netevia Group LLC) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Tot Group, Inc. [Member] Tot Group, Inc. [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.25% 7.50%  
Investment Interest Rate 11.23% 10.92% 11.23%  
Investment, Acquisition Date Jun. 28, 2024 Jun. 28, 2024    
Investment Maturity Date Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029  
Investment Owned, Balance, Principal Amount $ 9,111 $ 9,146    
Investment Owned, at Cost 8,987 9,000    
Investment Owned, at Fair Value $ 9,109 $ 9,023    
Percent of net assets 3.60% 3.40% 3.60%  
Investment, Identifier [Axis]: TVG I-EMSI Parent, LLC Class A units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TvgIEmsiParentLlcMember whfcl:TvgIEmsiParentLlcMember    
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Education Services [Member] Education Services [Member] Education Services [Member]  
Investment, Acquisition Date Sep. 01, 2025 Sep. 01, 2025    
Investment Owned, Balance, Principal Amount $ 20,765 $ 20,765    
Investment, Identifier [Axis]: TVG I-EMSI Parent, LLC Class B units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TvgIEmsiParentLlcMember whfcl:TvgIEmsiParentLlcMember    
Investment, Type [Extensible Enumeration] whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Education Services [Member] Education Services [Member] Education Services [Member]  
Investment, Acquisition Date Sep. 01, 2025 Sep. 01, 2025    
Investment Owned, Balance, Principal Amount $ 2 $ 2    
Investment Owned, at Cost 3,291 3,291    
Investment Owned, at Fair Value $ 2,531 $ 3,291    
Percent of net assets 1.00% 1.30% 1.00%  
Investment, Identifier [Axis]: TableTrust Brands LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TabletrustBrandsLlcMember whfcl:TabletrustBrandsLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 5.75% 6.00%  
Investment Interest Rate 8.66% 9.57% 8.66%  
Investment, Acquisition Date Dec. 24, 2024 Dec. 24, 2024    
Investment Maturity Date Jun. 28, 2028 Jun. 28, 2028 Jun. 28, 2028  
Investment Owned, Balance, Principal Amount $ 2,731 $ 2,480    
Investment Owned, at Cost 2,708 2,453    
Investment Owned, at Fair Value $ 2,716 $ 2,480    
Fair Value As A Percentage of Member's Equity 8.00% 7.50%    
Investment, Identifier [Axis]: Telestream 2 LLC (d/b/a Telestream Holdings Corporation), First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Telestream 2 LLC Telestream Holdings Corporation [Member] Telestream 2 LLC Telestream Holdings Corporation [Member]    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25%  
Investment Interest Rate 9.92% 10.19% 9.92%  
Investment, Acquisition Date Jun. 07, 2025 Jun. 07, 2025    
Investment Maturity Date Jun. 07, 2028 Jun. 07, 2028 Jun. 07, 2028  
Investment Owned, at Fair Value $ 16 $ 20    
Investment, Identifier [Axis]: Telestream 2 LLC (d/b/a Telestream Holdings Corporation), First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Telestream 2 LLC Telestream Holdings Corporation [Member] Telestream 2 LLC Telestream Holdings Corporation [Member]    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25%  
Investment Interest Rate 9.92% 10.19% 9.92%  
Investment, Acquisition Date Jun. 07, 2025 Jun. 07, 2025    
Investment Maturity Date Jun. 07, 2028 Jun. 07, 2028 Jun. 07, 2028  
Investment Owned, Balance, Principal Amount $ 11,379 $ 11,437    
Investment Owned, at Cost 11,379 11,437    
Investment Owned, at Fair Value $ 11,379 $ 11,437    
Percent of net assets 4.50% 4.40% 4.50%  
Investment, Identifier [Axis]: Telestream Topco 2 LLC (d/b/a Telestream Holdings Corporation), Common Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Telestream 2 LLC Telestream Holdings Corporation [Member] whfcl:TelestreamTopco2LlcMember    
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals  
Investment, Acquisition Date Jun. 07, 2025 Jun. 07, 2025    
Investment Owned, Balance, Principal Amount $ 497 $ 497    
Investment Owned, at Cost 7,109 7,109    
Investment Owned, at Fair Value $ 8,095 $ 8,027    
Percent of net assets 3.20% 3.10% 3.20%  
Investment, Identifier [Axis]: Texas Express Wash, LLC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TexasExpressWashLlcMember whfcl:TexasExpressWashLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.24% 10.23% 10.24%  
Investment, Acquisition Date Nov. 26, 2025 Nov. 26, 2025    
Investment Maturity Date Nov. 26, 2030 Nov. 26, 2030 Nov. 26, 2030  
Investment Owned, Balance, Principal Amount $ 472      
Investment Owned, at Cost 458      
Investment Owned, at Fair Value $ 516      
Percent of net assets 0.20%   0.20%  
Investment, Identifier [Axis]: Texas Express Wash, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TexasExpressWashLlcMember whfcl:TexasExpressWashLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.24% 10.23% 10.24%  
Investment, Acquisition Date Nov. 26, 2025 Nov. 26, 2025    
Investment Maturity Date Nov. 26, 2030 Nov. 26, 2030 Nov. 26, 2030  
Investment Owned, Balance, Principal Amount $ 104 $ 104    
Investment Owned, at Cost 101 100    
Investment Owned, at Fair Value $ 110 $ 100    
Investment, Identifier [Axis]: Texas Express Wash, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TexasExpressWashLlcMember whfcl:TexasExpressWashLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50%  
Investment Interest Rate 10.24% 10.23% 10.24%  
Investment, Acquisition Date Nov. 26, 2025 Nov. 26, 2025    
Investment Maturity Date Nov. 26, 2030 Nov. 26, 2030 Nov. 26, 2030  
Investment Owned, Balance, Principal Amount $ 11,073 $ 11,128    
Investment Owned, at Cost 10,759 10,778    
Investment Owned, at Fair Value $ 11,015 $ 10,776    
Percent of net assets 4.40% 4.10% 4.40%  
Investment, Identifier [Axis]: Texas Express Wash, LLC Second Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TexasExpressWashLlcMember whfcl:TexasExpressWashLlcMember    
Investment, Type [Extensible Enumeration] whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]  
Investment Interest Rate 14.00% 14.00% 14.00%  
Investment, Acquisition Date Nov. 26, 2025 Nov. 26, 2025    
Investment Maturity Date Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031  
Investment Owned, Balance, Principal Amount $ 1,625 $ 1,569    
Investment Owned, at Cost 1,502 1,436    
Investment Owned, at Fair Value $ 1,573 $ 1,435    
Investment, Interest Rate, Paid in Kind   7.00%    
Investment, Interest Rate, Paid in Cash 7.00% 7.00% 7.00%  
Percent of net assets 0.60% 0.60% 0.60%  
Investment, Identifier [Axis]: Texas Wash Holdings, LLC (d/b/a ClearWater Express Wash), Warrants        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TexasWashHoldingsLlcMember whfcl:TexasWashHoldingsLlcMember    
Investment, Type [Extensible Enumeration] Warrant [Member] Warrant [Member] Warrant [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]  
Investment, Acquisition Date Nov. 26, 2025 Nov. 26, 2025    
Investment Owned, at Cost $ 197 $ 197    
Investment Owned, at Fair Value $ 204 $ 197    
Percent of net assets 0.10% 0.10% 0.10%  
Investment, Identifier [Axis]: The Crom Corporation First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:CromCorporationMember whfcl:CromCorporationMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Water Utilities Water Utilities Water Utilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.75% 5.00% 4.75%  
Investment Interest Rate 8.42% 8.90% 8.42%  
Investment, Acquisition Date Mar. 05, 2025 Mar. 05, 2025    
Investment Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031  
Investment Owned, Balance, Principal Amount $ 798 $ 802    
Investment Owned, at Cost 790 793    
Investment Owned, at Fair Value $ 811 $ 806    
Fair Value As A Percentage of Member's Equity 2.40% 2.50%    
Investment, Identifier [Axis]: The Crom Corporation First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:CromCorporationMember whfcl:CromCorporationMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Water Utilities Water Utilities Water Utilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Base Rate [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.75% 5.00% 4.75%  
Investment Interest Rate 8.41% 8.84% 8.41%  
Investment, Acquisition Date Mar. 05, 2025 Mar. 05, 2025    
Investment Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031  
Investment Owned, Balance, Principal Amount $ 168 $ 312    
Investment Owned, at Cost 166 308    
Investment Owned, at Fair Value $ 174 $ 317    
Fair Value As A Percentage of Member's Equity 0.50% 1.00%    
Investment, Identifier [Axis]: The Crom Corporation First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:CromCorporationMember whfcl:CromCorporationMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Water Utilities Water Utilities Water Utilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.75% 5.00% 4.75%  
Investment Interest Rate 8.41% 8.84% 8.41%  
Investment, Acquisition Date Mar. 05, 2025 Mar. 05, 2025    
Investment Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031  
Investment Owned, Balance, Principal Amount $ 4,029 $ 4,049    
Investment Owned, at Cost 3,983 3,998    
Investment Owned, at Fair Value $ 4,058 $ 4,049    
Fair Value As A Percentage of Member's Equity 12.00% 12.20%    
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TheKyjenCompanyLLCMember whfcl:TheKyjenCompanyLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Products Household Products Household Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Prime Rate [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 7.50% 6.50%  
Investment Interest Rate 13.25% 11.61% 13.25%  
Investment, Acquisition Date Apr. 05, 2021 Apr. 05, 2021    
Investment Maturity Date Oct. 06, 2026 Apr. 05, 2026 Oct. 06, 2026  
Investment Owned, Balance, Principal Amount $ 375      
Investment Owned, at Cost 383      
Investment Owned, at Fair Value $ 78 $ (132)    
Investment, Interest Rate, Paid in Kind 2.50% 1.00% 2.50%  
Investment, Interest Rate, Paid in Cash 10.75% 10.61% 10.75%  
Percent of net assets   (0.10%)    
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TheKyjenCompanyLLCMember whfcl:TheKyjenCompanyLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Products Household Products Household Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.50% 7.50%  
Investment Interest Rate 11.23% 11.61% 11.23%  
Investment, Acquisition Date Apr. 05, 2021 Apr. 05, 2021    
Investment Maturity Date Oct. 06, 2026 Apr. 05, 2026 Oct. 06, 2026  
Investment Owned, Balance, Principal Amount $ 11,439 $ 11,409    
Investment Owned, at Cost 11,307 11,400    
Investment Owned, at Fair Value $ 7,701 $ 9,790    
Investment, Interest Rate, Paid in Kind 1.00% 1.00% 1.00%  
Investment, Interest Rate, Paid in Cash 10.23% 10.61% 10.23%  
Percent of net assets 3.00% 3.80% 3.00%  
Investment, Identifier [Axis]: Token Buyer, Inc First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration]   whfcl:TokenBuyerIncMember    
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]   Household Appliances    
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]    
Investment, Interest Rate, Floor   0.50%    
Spread Above Index   6.00%    
Investment Interest Rate   9.99%    
Investment, Acquisition Date   May 26, 2022    
Investment Maturity Date   May 31, 2029    
Investment Owned, Balance, Principal Amount   $ 1,587    
Investment Owned, at Cost   1,363    
Investment Owned, at Fair Value   $ 1,199    
Percent of net assets   0.50%    
Investment, Identifier [Axis]: Trailhead Media LLC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TrailheadMediaLLCMember whfcl:TrailheadMediaLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.23% 9.17% 9.23%  
Investment, Acquisition Date Jan. 22, 2025 Jan. 22, 2025    
Investment Maturity Date Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029  
Investment Owned, at Fair Value $ (5) $ (3)    
Investment, Interest Rate, Paid in Kind 0.75% 0.75% 0.75%  
Investment, Interest Rate, Paid in Cash 8.48% 8.42% 8.48%  
Investment, Identifier [Axis]: Trailhead Media LLC, First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TrailheadMediaLLCMember whfcl:TrailheadMediaLLCMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.23% 9.17% 9.23%  
Investment, Acquisition Date Jan. 22, 2025 Jan. 22, 2025    
Investment Maturity Date Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029  
Investment Owned, at Fair Value $ (4) $ (3)    
Investment, Interest Rate, Paid in Kind 0.75% 0.75% 0.75%  
Investment, Interest Rate, Paid in Cash 8.48% 8.42% 8.48%  
Investment, Identifier [Axis]: Trailhead Media LLC, First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TrailheadMediaLLCMember whfcl:TrailheadMediaLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50%  
Investment Interest Rate 9.23% 9.17% 9.23%  
Investment, Acquisition Date Jan. 22, 2025 Jan. 22, 2025    
Investment Maturity Date Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029  
Investment Owned, Balance, Principal Amount $ 6,624 $ 6,632    
Investment Owned, at Cost 6,555 6,553    
Investment Owned, at Fair Value $ 6,524 $ 6,532    
Investment, Interest Rate, Paid in Kind 0.75% 0.75% 0.75%  
Investment, Interest Rate, Paid in Cash 8.48% 8.42% 8.48%  
Fair Value As A Percentage of Member's Equity 19.20% 19.90%    
Investment, Identifier [Axis]: Transervice Holdings, Inc. (d/b/a Transervice Logistics, Inc.), First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TranserviceHoldingsIncMember whfcl:TranserviceHoldingsIncMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Cargo Ground Transportation [Member] Cargo Ground Transportation [Member] Cargo Ground Transportation [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 2.00% 2.00% 2.00%  
Spread Above Index 7.50% 7.25% 7.50%  
Investment Interest Rate 11.24% 11.07% 11.24%  
Investment, Acquisition Date Jun. 29, 2023 Jun. 29, 2023    
Investment Maturity Date Jun. 29, 2028 Jun. 29, 2028 Jun. 29, 2028  
Investment Owned, Balance, Principal Amount $ 7,589 $ 7,701    
Investment Owned, at Cost 7,498 7,586    
Investment Owned, at Fair Value $ 7,583 $ 7,701    
Percent of net assets 3.00% 3.00% 3.00%  
Investment, Identifier [Axis]: Trimlite Buyer LLC (d/b/a Trimlite LLC) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TrimliteBuyerLLCMember whfcl:TrimliteBuyerLLCMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Canadian Overnight Repo Rate Average Three Months Term [Member] Canadian Overnight Repo Rate Average Three Months Term [Member] Canadian Overnight Repo Rate Average Three Months Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.75% 5.50% 4.75%  
Investment Interest Rate 7.04% 8.08% 7.04%  
Investment, Acquisition Date Mar. 11, 2026 Jul. 27, 2021    
Investment Maturity Date Mar. 11, 2031 Jul. 27, 2027 Mar. 11, 2031  
Investment Owned, Balance, Principal Amount $ 1,896 $ 18,868    
Investment Owned, at Cost 1,382 14,957    
Investment Owned, at Fair Value $ 1,329 $ 13,748    
Percent of net assets 0.50% 5.30% 0.50%  
Investment, Identifier [Axis]: Trimlite Buyer LLC, First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TrimliteBuyerLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Building Products   Building Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 4.75%   4.75%  
Investment Interest Rate 8.48%   8.48%  
Investment, Acquisition Date May 20, 2026      
Investment Maturity Date Mar. 11, 2031   Mar. 11, 2031  
Investment Owned, at Fair Value $ 4      
Investment, Identifier [Axis]: Trimlite Buyer LLC, First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TrimliteBuyerLLCMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Building Products   Building Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 4.75%   4.75%  
Investment Interest Rate 8.48%   8.48%  
Investment, Acquisition Date May 20, 2026      
Investment Maturity Date Mar. 11, 2031   Mar. 11, 2031  
Investment Owned, Balance, Principal Amount $ 2,744      
Investment Owned, at Cost 2,718      
Investment Owned, at Fair Value $ 2,729      
Fair Value As A Percentage of Member's Equity 8.00%      
Investment, Identifier [Axis]: TriplePoint Acquisition Holdings LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TriplepointAcquisitionHoldingsLlcMember whfcl:TriplepointAcquisitionHoldingsLlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.25% 5.25% 5.25%  
Investment Interest Rate 8.98% 8.92% 8.98%  
Investment, Acquisition Date Jun. 14, 2024 Jun. 14, 2024    
Investment Maturity Date May 31, 2029 May 31, 2029 May 31, 2029  
Investment Owned, at Fair Value $ 16 $ 18    
Fair Value As A Percentage of Member's Equity   0.10%    
Investment, Identifier [Axis]: TriplePoint Acquisition Holdings LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TriplepointAcquisitionHoldingsLlcMember whfcl:TriplepointAcquisitionHoldingsLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.25% 5.25% 5.25%  
Investment Interest Rate 8.98% 8.92% 8.98%  
Investment, Acquisition Date Jun. 14, 2024 Jun. 14, 2024    
Investment Maturity Date May 31, 2029 May 31, 2029 May 31, 2029  
Investment Owned, Balance, Principal Amount $ 8,052 $ 8,093    
Investment Owned, at Cost 7,951 7,975    
Investment Owned, at Fair Value $ 8,080 $ 8,107    
Fair Value As A Percentage of Member's Equity 23.70% 24.70%    
Investment, Identifier [Axis]: Turnberry Solutions, Inc.First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TurnberrySolutionsInc.Member whfcl:TurnberrySolutionsInc.Member    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 5.75% 6.00%  
Investment Interest Rate 9.81% 9.57% 9.81%  
Investment, Acquisition Date Aug. 10, 2021 Aug. 10, 2021    
Investment Maturity Date Mar. 02, 2028 Mar. 02, 2028 Mar. 02, 2028  
Investment Owned, at Fair Value $ 2 $ 2    
Investment, Identifier [Axis]: Turnberry Solutions, Inc.First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TurnberrySolutionsInc.Member whfcl:TurnberrySolutionsInc.Member    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 5.75% 6.00%  
Investment Interest Rate 9.81% 9.57% 9.81%  
Investment, Acquisition Date Aug. 10, 2021 Aug. 10, 2021    
Investment Maturity Date Mar. 02, 2028 Mar. 02, 2028 Mar. 02, 2028  
Investment Owned, Balance, Principal Amount $ 5,872 $ 5,902    
Investment Owned, at Cost 5,857 5,885    
Investment Owned, at Fair Value $ 5,872 $ 5,902    
Fair Value As A Percentage of Member's Equity 17.30% 18.00%    
Investment, Identifier [Axis]: Twin Ridge CRS, LP (d/b/a CRS OneSource) Class A Common Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:TwinRidgeCrsLpMember whfcl:TwinRidgeCrsLpMember    
Investment, Type [Extensible Enumeration] whfcl:ClassCommonUnitsMember whfcl:ClassCommonUnitsMember whfcl:ClassCommonUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Food Distributors Food Distributors Food Distributors  
Investment, Acquisition Date May 10, 2024 May 10, 2024    
Investment Owned, Balance, Principal Amount $ 63 $ 63    
Investment Owned, at Cost 317 317    
Investment Owned, at Fair Value $ 343 $ 264    
Percent of net assets 0.10% 0.10% 0.10%  
Investment, Identifier [Axis]: UserZoom Technologies, Inc. First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:UserzoomTechnologiesIncMember whfcl:UserzoomTechnologiesIncMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Application Software Air Freight & Logistics  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Six Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 7.75% 7.50% 7.75%  
Investment Interest Rate 11.40% 11.63% 11.40%  
Investment, Acquisition Date Jan. 12, 2023 Jan. 12, 2023    
Investment Maturity Date Apr. 05, 2029 Apr. 05, 2029 Apr. 05, 2029  
Investment Owned, Balance, Principal Amount $ 10,686 $ 9,819    
Investment Owned, at Cost 10,542 9,665    
Investment Owned, at Fair Value $ 10,415 $ 9,621    
Investment, Interest Rate, Paid in Kind 1.75%   1.75%  
Investment, Interest Rate, Paid in Cash 9.65%   9.65%  
Percent of net assets 4.10% 3.70% 4.10%  
Investment, Identifier [Axis]: Vibration Mountings amp; Controls, Inc, Common Stock        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Vibration Mountings & Controls, Inc. [Member]      
Investment, Type [Extensible Enumeration] Common Stock [Member]   Common Stock [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components  
Investment, Acquisition Date Jun. 23, 2026      
Investment Owned, at Cost $ 95      
Investment Owned, at Fair Value $ 95      
Investment, Identifier [Axis]: Vibration Mountings amp; Controls, Inc, First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Vibration Mountings & Controls, Inc. [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 5.00%   5.00%  
Investment Interest Rate 8.70%   8.70%  
Investment, Acquisition Date Jun. 23, 2026      
Investment Maturity Date Jun. 23, 2031   Jun. 23, 2031  
Investment, Identifier [Axis]: Vibration Mountings amp; Controls, Inc, First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Vibration Mountings & Controls, Inc. [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 5.00%   5.00%  
Investment Interest Rate 8.70%   8.70%  
Investment, Acquisition Date Jun. 23, 2026      
Investment Maturity Date Jun. 23, 2031   Jun. 23, 2031  
Investment, Identifier [Axis]: Vibration Mountings amp; Controls, Inc, First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] Vibration Mountings & Controls, Inc. [Member]      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]   Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 5.00%   5.00%  
Investment Interest Rate 8.70%   8.70%  
Investment, Acquisition Date Jun. 23, 2026      
Investment Maturity Date Jun. 23, 2031   Jun. 23, 2031  
Investment Owned, Balance, Principal Amount $ 6,378      
Investment Owned, at Cost 6,282      
Investment Owned, at Fair Value $ 6,282      
Percent of net assets 2.50%   2.50%  
Investment, Identifier [Axis]: Vistria Blocked MGT Investor, LP (d/b/a MGT Consulting Group) Preferred Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:VistriaBlockedMgtInvestorLpMember whfcl:VistriaBlockedMgtInvestorLpMember    
Investment, Type [Extensible Enumeration] whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Acquisition Date Apr. 10, 2023 Apr. 10, 2023    
Investment Owned, at Fair Value $ 15 $ 15    
Investment, Identifier [Axis]: Vistria Blocked MGT Investor, LP (d/b/a MGT Consulting Group) Series A Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:VistriaBlockedMgtInvestorLpMember whfcl:VistriaBlockedMgtInvestorLpMember    
Investment, Type [Extensible Enumeration] whfcl:SeriesUnitsMember whfcl:SeriesUnitsMember whfcl:SeriesUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Acquisition Date Apr. 10, 2023 Apr. 10, 2023    
Investment Owned, at Fair Value $ 47 $ 308    
Percent of net assets   0.10%    
Investment, Identifier [Axis]: W Electric Intermediate Holdings, LLC (d/b/a Westinghouse Electric Corporation) - First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:WElectricIntermediateHoldingsLlcMember whfcl:WElectricIntermediateHoldingsLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.50% 6.00%  
Investment Interest Rate 9.64% 10.22% 9.64%  
Investment, Acquisition Date Aug. 15, 2024 Aug. 15, 2024    
Investment Maturity Date Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029  
Investment Owned, Balance, Principal Amount $ 12,303 $ 12,308    
Investment Owned, at Cost 12,170 12,154    
Investment Owned, at Fair Value $ 12,303 $ 12,334    
Investment, Interest Rate, Paid in Kind 0.50% 1.00% 0.50%  
Investment, Interest Rate, Paid in Cash 9.14% 9.22% 9.14%  
Percent of net assets 4.90% 4.70% 4.90%  
Investment, Identifier [Axis]: WCHG Buyer, Inc.,First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:WchgBuyerInc.Member whfcl:WchgBuyerInc.Member    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember First Lien Secured Term Loan [Member] whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 4.75% 4.75% 4.75%  
Investment Interest Rate 8.66% 8.47% 8.66%  
Investment, Acquisition Date Apr. 01, 2025 Apr. 01, 2025    
Investment Maturity Date Apr. 10, 2031 Apr. 10, 2031 Apr. 10, 2031  
Investment Owned, Balance, Principal Amount $ 12,226 $ 6,948    
Investment Owned, at Cost 12,156 6,918    
Investment Owned, at Fair Value $ 12,130 $ 6,948    
Fair Value As A Percentage of Member's Equity 35.60% 21.10%    
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Equity        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:WHFSTRSOhioSeniorLoanFundLLCMember whfcl:WHFSTRSOhioSeniorLoanFundLLCMember    
Investment, Type [Extensible Enumeration] Equity Investments Equity Investments Equity Investments  
Investment Owned, at Fair Value $ 22,361 $ 21,602   22,741
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Interests        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:WHFSTRSOhioSeniorLoanFundLLCMember whfcl:WHFSTRSOhioSeniorLoanFundMember    
Investment, Type [Extensible Enumeration] whfcl:LLCInterestsMember whfcl:LLCInterestsMember whfcl:LLCInterestsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Finance [Member] Specialized Finance [Member] Specialized Finance [Member]  
Investment, Acquisition Date Jul. 19, 2019 Jul. 19, 2019    
Investment Owned, Balance, Principal Amount $ 21,564 $ 21,104    
Investment Owned, at Cost 21,564 21,104    
Investment Owned, at Fair Value $ 22,361 $ 21,602    
Percent of net assets 8.80% 8.30% 8.80%  
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Subordinated Note        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:WHFSTRSOhioSeniorLoanFundLLCMember whfcl:WHFSTRSOhioSeniorLoanFundLLCMember    
Investment, Type [Extensible Enumeration] Subordinated Debt [Member] Subordinated Debt [Member] Subordinated Debt [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Finance [Member] Specialized Finance [Member] Specialized Finance [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 0.00%   0.00%  
Investment, Acquisition Date Jul. 19, 2019 Jul. 19, 2019    
Investment Owned, Balance, Principal Amount $ 86,256 $ 84,416    
Investment Owned, at Cost 86,256 84,416    
Investment Owned, at Fair Value $ 86,256 $ 84,416   $ 84,416
Percent of net assets 34.10% 32.50% 34.10%  
Investment, Identifier [Axis]: Wamp;A Intermediate Co., LLC First Lien Secured Delayed Draw Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25%  
Investment Interest Rate 9.98% 9.92% 9.98%  
Investment, Acquisition Date Aug. 01, 2024 Aug. 01, 2024    
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Investment Owned, at Fair Value $ (1) $ 1    
Investment, Identifier [Axis]: Wamp;A Intermediate Co., LLC First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25%  
Investment Interest Rate 9.98% 9.92% 9.98%  
Investment, Acquisition Date Aug. 01, 2024 Aug. 01, 2024    
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Investment Owned, Balance, Principal Amount $ 448 $ 345    
Investment Owned, at Cost 443 340    
Investment Owned, at Fair Value $ 447 $ 346    
Percent of net assets 0.20% 0.10% 0.20%  
Investment, Identifier [Axis]: Wamp;A Intermediate Co., LLC First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25%  
Investment Interest Rate 9.98% 9.92% 9.98%  
Investment, Acquisition Date Aug. 01, 2024 Aug. 01, 2024    
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Investment Owned, Balance, Principal Amount $ 7,078 $ 7,148    
Investment Owned, at Cost 6,991 7,045    
Investment Owned, at Fair Value $ 7,027 $ 7,100    
Percent of net assets 2.80% 2.70% 2.80%  
Investment, Identifier [Axis]: What If Media Group, LLC Common Units        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:WhatIfMediaGroupLLCMember whfcl:WhatIfMediaGroupLLCMember    
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Interactive Media And Services [Member] Interactive Media And Services [Member] Interactive Media And Services [Member]  
Investment, Acquisition Date Jul. 02, 2021 Jul. 02, 2021    
Investment Owned, Balance, Principal Amount $ 851 $ 3,081    
Investment Owned, at Cost 851 851    
Investment Owned, at Fair Value $ 1,961 $ 1,963    
Percent of net assets 0.80% 0.80% 0.80%  
Investment, Identifier [Axis]: Whitestone Home Furnishings, LLC (d/b/a Saatva, Inc.) First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:WhitestoneHomeFurnishingsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Home Furnishings [Member]   Home Furnishings [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member]   Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00%   1.00%  
Spread Above Index 5.50%   5.50%  
Investment Interest Rate 9.14%   9.14%  
Investment, Acquisition Date Jan. 12, 2026      
Investment Maturity Date Sep. 30, 2027   Sep. 30, 2027  
Investment Owned, at Fair Value $ 5      
Investment, Identifier [Axis]: Whitestone Home Furnishings, LLC (d/b/a Saatva, Inc.) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:WhitestoneHomeFurnishingsLlcMember whfcl:WhitestoneHomeFurnishingsLlcMember    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Home Furnishings [Member] Home Furnishings [Member] Home Furnishings [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.25% 5.50%  
Investment Interest Rate 9.14% 8.97% 9.14%  
Investment, Acquisition Date Nov. 06, 2023 Nov. 06, 2023    
Investment Maturity Date Sep. 30, 2027 Aug. 20, 2026 Sep. 30, 2027  
Investment Owned, Balance, Principal Amount $ 4,669 $ 2,848    
Investment Owned, at Cost 4,638 2,832    
Investment Owned, at Fair Value $ 4,671 $ 2,848    
Percent of net assets 1.80% 1.10% 1.80%  
Investment, Identifier [Axis]: Zephyr Buyer, L.P. (d/b/a The Weather Company, LLC) First Lien Secured Revolving Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ZephyrBuyerL.p.Member whfcl:ZephyrBuyerL.p.Member    
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Interactive Media And Services [Member] Interactive Media And Services [Member] Interactive Media And Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 0.50% 0.50% 0.50%  
Spread Above Index 4.75% 4.75% 4.75%  
Investment Interest Rate 8.39% 8.42% 8.39%  
Investment, Acquisition Date Jan. 31, 2024 Jan. 31, 2024    
Investment Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031  
Investment Owned, at Fair Value $ 29 $ 32    
Investment, Identifier [Axis]: Zephyr Buyer, L.P. (d/b/a The Weather Company, LLC) First Lien Secured Term Loan        
Schedule of Investments [Line Items]        
Investment, Issuer Name [Extensible Enumeration] whfcl:ZephyrBuyerL.p.Member whfcl:ZephyrBuyerL.p.Member    
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Interactive Media And Services [Member] Interactive Media And Services [Member] Interactive Media And Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) One Month Term [Member] Secured Overnight Financing Rate (SOFR) Three Month Term [Member] Secured Overnight Financing Rate (SOFR) One Month Term [Member]  
Investment, Interest Rate, Floor 0.50% 0.50% 0.50%  
Spread Above Index 4.75% 4.75% 4.75%  
Investment Interest Rate 8.39% 8.42% 8.39%  
Investment, Acquisition Date Jan. 31, 2024 Jan. 31, 2024    
Investment Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031  
Investment Owned, Balance, Principal Amount $ 13,828 $ 13,945    
Investment Owned, at Cost 13,609 13,701    
Investment Owned, at Fair Value $ 13,828 $ 13,945    
Percent of net assets 5.50% 5.40% 5.50%  
Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 518,411 $ 532,286    
Investment Owned, at Fair Value $ 506,279 $ 520,114    
Percent of net assets 200.30% 200.20% 200.30%  
Money Market Funds        
Schedule of Investments [Line Items]        
Money Market Funds amortized cost $ 22,964 $ 21,048    
Money Market Fair Value $ 22,964 $ 21,048    
Percent of net assets 9.10% 8.10% 9.10%  
Money Market Funds | STRS JV        
Schedule of Investments [Line Items]        
Money Market Funds amortized cost $ 2,093 $ 5,881    
Money Market Fair Value $ 2,093 $ 5,881    
Percent of net assets 6.20% 17.90% 6.20%  
Goldman Sachs Money Market Fund (CUSIP: 38141W315)        
Schedule of Investments [Line Items]        
Weighted average interest rate 3.33% 3.34% 3.33%  
Money Market Funds amortized cost $ 11,887 $ 8,829    
Money Market Fair Value $ 11,887 $ 8,829    
Percent of net assets 4.70% 3.40% 4.70%  
Goldman Sachs Money Market Fund (CUSIP: 38141W315) | STRS JV        
Schedule of Investments [Line Items]        
Weighted average interest rate 3.33% 3.34% 3.33%  
Money Market Funds amortized cost $ 1,493 $ 2,602    
Money Market Fair Value $ 1,493 $ 2,602    
Percent of net assets 4.40% 7.90% 4.40%  
JPMORGAN U.S. Treas Plus Money Market Fund | STRS JV        
Schedule of Investments [Line Items]        
Weighted average interest rate 3.51% 3.65% 3.51%  
Money Market Funds amortized cost $ 600 $ 3,279    
Money Market Fair Value $ 600 $ 3,279    
Percent of net assets 1.80% 10.00% 1.80%  
Invesco Treasury Money Market Fund (CUSIP: 825252406)        
Schedule of Investments [Line Items]        
Weighted average interest rate 3.56% 3.69% 3.56%  
Money Market Funds amortized cost $ 7,094 $ 7,032    
Money Market Fair Value $ 7,094 $ 7,032    
Percent of net assets 2.80% 2.70% 2.80%  
Advertising | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 18,552 $ 19,031    
Investment Owned, at Fair Value $ 18,534 $ 19,052    
Fair Value As A Percentage of Member's Equity 54.50% 58.00%    
Advertising | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 14,249 $ 14,081    
Investment Owned, at Fair Value $ 14,297 $ 13,653    
Percent of net assets 5.70% 5.30% 5.70%  
Air Freight & Logistics | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost   $ 3,262    
Investment Owned, at Fair Value   $ 3,273    
Fair Value As A Percentage of Member's Equity   10.00%    
Air Freight & Logistics | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 9,540 $ 9,416    
Investment Owned, at Fair Value $ 9,388 $ 9,281    
Percent of net assets 3.70% 3.50% 3.70%  
Asset Management & Custody Banks | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 11,303 $ 8,881    
Investment Owned, at Fair Value $ 11,581 $ 9,074    
Fair Value As A Percentage of Member's Equity 34.00% 27.60%    
Application Software | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 29,402 $ 22,062    
Investment Owned, at Fair Value $ 28,222 $ 20,888    
Percent of net assets 11.20% 8.00% 11.20%  
Broadline Retail | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 17,643 $ 18,019    
Investment Owned, at Fair Value $ 16,977 $ 17,260    
Fair Value As A Percentage of Member's Equity 49.90% 52.50%    
Building Products | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 24,924 $ 22,594    
Investment Owned, at Fair Value $ 25,163 $ 22,800    
Fair Value As A Percentage of Member's Equity 73.90% 69.40%    
Building Products | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 1,382 $ 14,957    
Investment Owned, at Fair Value $ 1,329 $ 13,748    
Percent of net assets 0.50% 5.30% 0.50%  
Construction & Engineering | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 18,200 $ 12,898    
Investment Owned, at Fair Value $ 18,444 $ 12,796    
Fair Value As A Percentage of Member's Equity 54.10% 39.00%    
Construction & Engineering | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 5,057 $ 9,736    
Investment Owned, at Fair Value $ 5,140 $ 9,849    
Percent of net assets 2.00% 3.80% 2.00%  
Diversified Support Services | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 29,512 $ 24,227    
Investment Owned, at Fair Value $ 29,627 $ 23,644    
Fair Value As A Percentage of Member's Equity 87.10% 71.80%    
Diversified Support Services | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 15,392 $ 15,110    
Investment Owned, at Fair Value $ 15,469 $ 15,072    
Percent of net assets 6.20% 5.70% 6.20%  
Electrical Components & Equipment | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 9,218 $ 9,298    
Investment Owned, at Fair Value $ 9,290 $ 9,332    
Fair Value As A Percentage of Member's Equity 27.20% 28.40%    
Environmental & Facilities Services | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 29,953 $ 29,460    
Investment Owned, at Fair Value $ 29,999 $ 29,529    
Fair Value As A Percentage of Member's Equity 88.20% 90.00%    
Environmental & Facilities Services | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 2,831 $ 1,568    
Investment Owned, at Fair Value $ 2,867 $ 1,610    
Percent of net assets 1.20% 0.70% 1.20%  
Health Care Facilities | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 13,424 $ 13,327    
Investment Owned, at Fair Value $ 13,548 $ 13,387    
Fair Value As A Percentage of Member's Equity 39.80% 40.70%    
Health Care Facilities | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 4,768 $ 4,534    
Investment Owned, at Fair Value $ 4,897 $ 4,623    
Percent of net assets 1.90% 1.80% 1.90%  
Health Care Services | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 4,860 $ 4,872    
Investment Owned, at Fair Value $ 4,931 $ 4,982    
Fair Value As A Percentage of Member's Equity 14.50% 15.10%    
Health Care Services | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 8,361 $ 8,315    
Investment Owned, at Fair Value $ 8,406 $ 8,389    
Percent of net assets 3.40% 3.20% 3.40%  
Health Care Supplies | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 20,269 $ 20,227    
Investment Owned, at Fair Value $ 20,409 $ 20,026    
Percent of net assets 8.10% 7.70% 8.10%  
Health Care Technology | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost   $ 4,132    
Investment Owned, at Fair Value   $ 4,183    
Fair Value As A Percentage of Member's Equity   12.70%    
Health Care Technology | Debt Investments | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 4,704      
Investment Owned, at Fair Value $ 4,751      
Fair Value As A Percentage of Member's Equity 13.90%      
Human Resource & Employment Services | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 2,477 $ 2,484    
Investment Owned, at Fair Value $ 2,478 $ 2,493    
Fair Value As A Percentage of Member's Equity 7.30% 7.60%    
Human Resource & Employment Services | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 2,890 $ 2,899    
Investment Owned, at Fair Value $ 2,891 $ 2,909    
Percent of net assets 1.10% 1.10% 1.10%  
Household Appliances | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 7,427 $ 7,416    
Investment Owned, at Fair Value $ 8,024 $ 8,225    
Fair Value As A Percentage of Member's Equity 23.60% 25.00%    
Household Appliances | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost   $ 1,363    
Investment Owned, at Fair Value   $ 1,199    
Percent of net assets   0.50%    
Household Products | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 10,250 $ 10,293    
Investment Owned, at Fair Value $ 10,419 $ 10,384    
Fair Value As A Percentage of Member's Equity 30.60% 31.60%    
Household Products | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 11,690 $ 11,400    
Investment Owned, at Fair Value $ 7,785 $ 9,658    
Percent of net assets 3.00% 3.70% 3.00%  
Industrial Machinery & Supplies & Components | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 18,452 $ 12,154    
Investment Owned, at Fair Value $ 18,585 $ 12,334    
Percent of net assets 7.40% 4.70% 7.40%  
IT Consulting And Other Services | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 35,050 $ 35,186    
Investment Owned, at Fair Value $ 34,262 $ 34,895    
Fair Value As A Percentage of Member's Equity 100.80% 106.20%    
IT Consulting And Other Services | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 486 $ 281    
Investment Owned, at Fair Value $ 479 $ 300    
Percent of net assets 0.20% 0.10% 0.20%  
Leisure Products | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 18,706 $ 18,585    
Investment Owned, at Fair Value $ 17,540 $ 16,672    
Percent of net assets 6.90% 6.40% 6.90%  
Multi-Utilities | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 5,590 $ 5,488    
Investment Owned, at Fair Value $ 5,657 $ 5,488    
Fair Value As A Percentage of Member's Equity 16.60% 16.70%    
Packaged Foods & Meats | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 6,686 $ 6,867    
Investment Owned, at Fair Value $ 6,745 $ 6,961    
Fair Value As A Percentage of Member's Equity 19.80% 21.00%    
Packaged Foods & Meats | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 3,580 $ 3,973    
Investment Owned, at Fair Value $ 3,626 $ 4,033    
Percent of net assets 1.40% 1.60% 1.40%  
Paper & Plastic Packaging Products & Materials | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 18,930 $ 21,612    
Investment Owned, at Fair Value $ 18,955 $ 21,677    
Fair Value As A Percentage of Member's Equity 55.70% 65.80%    
Personal Products | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost   $ 3,850    
Investment Owned, at Fair Value   $ 3,887    
Fair Value As A Percentage of Member's Equity   11.70%    
Pharmaceuticals | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 17,786      
Investment Owned, at Fair Value $ 17,739      
Fair Value As A Percentage of Member's Equity 52.10%      
Pharmaceuticals | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost   $ 12,031    
Investment Owned, at Fair Value   $ 12,027    
Percent of net assets   4.70%    
Real Estate Services | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 6,025 $ 12,651    
Investment Owned, at Fair Value $ 5,647 $ 12,139    
Fair Value As A Percentage of Member's Equity 16.60% 36.90%    
Research & Consulting Services | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 3,954 $ 3,890    
Investment Owned, at Fair Value $ 3,919 $ 3,859    
Fair Value As A Percentage of Member's Equity 11.50% 11.70%    
Research & Consulting Services | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 4,761 $ 4,748    
Investment Owned, at Fair Value $ 4,829 $ 4,831    
Percent of net assets 1.90% 1.90% 1.90%  
Systems Software | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 18,686 $ 18,657    
Investment Owned, at Fair Value $ 19,281 $ 19,360    
Percent of net assets 7.70% 7.50% 7.70%  
Technology Hardware, Storage & Peripherals | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 17,559 $ 17,746    
Investment Owned, at Fair Value $ 17,451 $ 17,840    
Fair Value As A Percentage of Member's Equity 51.30% 54.30%    
Technology Hardware, Storage & Peripherals | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 11,379 $ 11,437    
Investment Owned, at Fair Value $ 11,395 $ 11,457    
Percent of net assets 4.50% 4.40% 4.50%  
Water Utilities | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 4,939 $ 5,099    
Investment Owned, at Fair Value $ 5,043 $ 5,172    
Fair Value As A Percentage of Member's Equity 14.90% 15.70%    
Distributors | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 3,970 $ 4,002    
Investment Owned, at Fair Value $ 4,013 $ 4,067    
Fair Value As A Percentage of Member's Equity 11.80% 12.30%    
Food Distributors | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 4,839 $ 4,889    
Investment Owned, at Fair Value $ 4,877 $ 4,928    
Fair Value As A Percentage of Member's Equity 14.30% 15.00%    
Food Distributors | Debt Investments        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 215      
Investment Owned, at Fair Value $ 218      
Percent of net assets 0.10%   0.10%  
Trading Companies & Distributors | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 5,885 $ 5,909    
Investment Owned, at Fair Value $ 5,932 $ 5,925    
Fair Value As A Percentage of Member's Equity 17.60% 18.00%    
Wireless Telecommunication Services | STRS JV        
Schedule of Investments [Line Items]        
Investment Owned, at Cost $ 6,199 $ 6,218    
Investment Owned, at Fair Value $ 6,266 $ 6,300    
Fair Value As A Percentage of Member's Equity 18.40% 19.10%