v3.26.1
Cover - shares
6 Months Ended
Jun. 30, 2026
Aug. 12, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
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 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  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   20,231,124
Entity Central Index Key 0002035713  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Document Fiscal Year Focus 2026