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Investments at Fair Value - Schedule of Investments at Fair Value (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost $ 464,320,000 [1],[2],[3] $ 103,310,000 [4],[5]
Fair Value 463,295,000 [3],[6] 103,947,000 [5],[7],[8]
Net Unrealized Gain (Loss) (1,025,000) 637,000
First-lien debt investments    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost 389,340,000 103,310,000
Fair Value 388,556,000 103,947,000
Net Unrealized Gain (Loss) (784,000) $ 637,000
Second-lien debt investments    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost 50,102,000  
Fair Value 49,843,000  
Net Unrealized Gain (Loss) (259,000)  
Equity and other investments    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost 24,878,000  
Fair Value 24,896,000  
Net Unrealized Gain (Loss) $ 18,000  
[1] As of December 31, 2025, the estimated cost basis of investments for U.S. federal tax purposes was $465.0 million resulting in estimated gross unrealized gains and losses of $1.6 million and $3.3 million, respectfully.
[2] The amortized cost represents the original cost adjusted for the amortization of discounts and premiums, as applicable, on debt investments using the effective interest method.
[3] Unless otherwise indicated, the Company’s portfolio companies are domiciled in the United States. Under the 1940 Act, the Company would “control” a portfolio company if the Company owned more than 25% of its outstanding voting securities and/or had the power to exercise control over the management or policies of such portfolio company. As of December 31, 2025, the Company does not “control” any of the portfolio companies. Also under the 1940 Act, the Company would be deemed to be an “Affiliated Person” of a portfolio company if the Company owns more than 5% of the portfolio company's outstanding voting securities. As of December 31, 2025, the Company does not identify any of its portfolio companies as affiliates.
[4] The amortized cost represents the original cost adjusted for the amortization of discounts and premiums, as applicable, on debt investments using the effective interest method.
[5] Unless otherwise indicated, the Company’s portfolio companies are domiciled in the United States. Under the 1940 Act, the Company would “control” a portfolio company if the Company owned more than 25% of its outstanding voting securities and/or had the power to exercise control over the management or policies of such portfolio company. As of December 31, 2024, the Company did not “control” any of the portfolio companies. Also under the 1940 Act, the Company would be deemed to be an “Affiliated Person” of a portfolio company if the Company owns more than 5% of the portfolio company’s outstanding voting securities. As of December 31, 2024, the Company did not identify any of its portfolio companies as affiliates. The amortized cost represents the original cost adjusted for the amortization of discounts and premiums, as applicable, on debt investments using the effective interest method.
[6] In accordance with Financial Accounting Standards Board Accounting Standards Codification Topic 820, Fair Value Measurements (“ASC Topic 820”), unless otherwise indicated, the fair values of all investments were determined using significant unobservable inputs and are considered Level 3 investments. See Note 5 for further information related to investments at fair value.
[7] In accordance with ASC Topic 820, unless otherwise indicated, the fair values of all investments were determined using significant unobservable inputs and are considered Level 3 investments. See Note 5 for further information related to investments at fair value.
[8] As of December 31, 2024, Crestline Lending Solutions, LLC (the “Company”) had not yet elected to be regulated as a business development company (“BDC”), and was operating as Crestline Lending Solutions Ramp, LLC (the “Ramp Vehicle”), a private fund based on an exception from the definition of "investment company" under Section 3(c)(7) of the Investment Company Act of 1940, as amended (the “1940 Act”).