v3.26.1
Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 17, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Securities Act File Number 000-56777    
Entity Registrant Name Crestline Lending Solutions, LLC    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 99-3640580    
Entity Address, Address Line One 201 Main Street    
Entity Address, Address Line Two Suite 2100    
Entity Address, City or Town Fort Worth    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 76102    
City Area Code 817    
Local Phone Number 339-7600    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   17,464,889  
Entity Central Index Key 0002035713    
Document Fiscal Year Focus 2025    
Amendment Flag false    
Document Fiscal Period Focus FY    
Entity Public Float     $ 0